bisync: add options to auto-resolve conflicts - fixes #7471

Before this change, when a file was new/changed on both paths (relative to the
prior sync), and the versions on each side were not identical, bisync would
keep both versions, renaming them with ..path1 and ..path2 suffixes,
respectively. Many users have requested more control over how bisync handles
such conflicts -- including an option to automatically select one version as
the "winner" and rename or delete the "loser". This change introduces support
for such options.

--conflict-resolve CHOICE

In bisync, a "conflict" is a file that is *new* or *changed* on *both sides*
(relative to the prior run) AND is *not currently identical* on both sides.
`--conflict-resolve` controls how bisync handles such a scenario. The currently
supported options are:

- `none` - (the default) - do not attempt to pick a winner, keep and rename
both files according to `--conflict-loser` and
`--conflict-suffix` settings. For example, with the default
settings, `file.txt` on Path1 is renamed `file.txt.conflict1` and `file.txt` on
Path2 is renamed `file.txt.conflict2`. Both are copied to the opposite path
during the run, so both sides end up with a copy of both files. (As `none` is
the default, it is not necessary to specify `--conflict-resolve none` -- you
can just omit the flag.)
- `newer` - the newer file (by `modtime`) is considered the winner and is
copied without renaming. The older file (the "loser") is handled according to
`--conflict-loser` and `--conflict-suffix` settings (either renamed or
deleted.) For example, if `file.txt` on Path1 is newer than `file.txt` on
Path2, the result on both sides (with other default settings) will be `file.txt`
(winner from Path1) and `file.txt.conflict1` (loser from Path2).
- `older` - same as `newer`, except the older file is considered the winner,
and the newer file is considered the loser.
- `larger` - the larger file (by `size`) is considered the winner (regardless
of `modtime`, if any).
- `smaller` - the smaller file (by `size`) is considered the winner (regardless
of `modtime`, if any).
- `path1` - the version from Path1 is unconditionally considered the winner
(regardless of `modtime` and `size`, if any). This can be useful if one side is
usually more trusted or up-to-date than the other.
- `path2` - same as `path1`, except the path2 version is considered the
winner.

For all of the above options, note the following:
- If either of the underlying remotes lacks support for the chosen method, it
will be ignored and fall back to `none`. (For example, if `--conflict-resolve
newer` is set, but one of the paths uses a remote that doesn't support
`modtime`.)
- If a winner can't be determined because the chosen method's attribute is
missing or equal, it will be ignored and fall back to `none`. (For example, if
`--conflict-resolve newer` is set, but the Path1 and Path2 modtimes are
identical, even if the sizes may differ.)
- If the file's content is currently identical on both sides, it is not
considered a "conflict", even if new or changed on both sides since the prior
sync. (For example, if you made a change on one side and then synced it to the
other side by other means.) Therefore, none of the conflict resolution flags
apply in this scenario.
- The conflict resolution flags do not apply during a `--resync`, as there is
no "prior run" to speak of (but see `--resync-mode` for similar
options.)

--conflict-loser CHOICE

`--conflict-loser` determines what happens to the "loser" of a sync conflict
(when `--conflict-resolve` determines a winner) or to both
files (when there is no winner.) The currently supported options are:

- `num` - (the default) - auto-number the conflicts by automatically appending
the next available number to the `--conflict-suffix`, in chronological order.
For example, with the default settings, the first conflict for `file.txt` will
be renamed `file.txt.conflict1`. If `file.txt.conflict1` already exists,
`file.txt.conflict2` will be used instead (etc., up to a maximum of
9223372036854775807 conflicts.)
- `pathname` - rename the conflicts according to which side they came from,
which was the default behavior prior to `v1.66`. For example, with
`--conflict-suffix path`, `file.txt` from Path1 will be renamed
`file.txt.path1`, and `file.txt` from Path2 will be renamed `file.txt.path2`.
If two non-identical suffixes are provided (ex. `--conflict-suffix
cloud,local`), the trailing digit is omitted. Importantly, note that with
`pathname`, there is no auto-numbering beyond `2`, so if `file.txt.path2`
somehow already exists, it will be overwritten. Using a dynamic date variable
in your `--conflict-suffix` (see below) is one possible way to avoid this. Note
also that conflicts-of-conflicts are possible, if the original conflict is not
manually resolved -- for example, if for some reason you edited
`file.txt.path1` on both sides, and those edits were different, the result
would be `file.txt.path1.path1` and `file.txt.path1.path2` (in addition to
`file.txt.path2`.)
- `delete` - keep the winner only and delete the loser, instead of renaming it.
If a winner cannot be determined (see `--conflict-resolve` for details on how
this could happen), `delete` is ignored and the default `num` is used instead
(i.e. both versions are kept and renamed, and neither is deleted.) `delete` is
inherently the most destructive option, so use it only with care.

For all of the above options, note that if a winner cannot be determined (see
`--conflict-resolve` for details on how this could happen), or if
`--conflict-resolve` is not in use, *both* files will be renamed.

--conflict-suffix STRING[,STRING]

`--conflict-suffix` controls the suffix that is appended when bisync renames a
`--conflict-loser` (default: `conflict`).
`--conflict-suffix` will accept either one string or two comma-separated
strings to assign different suffixes to Path1 vs. Path2. This may be helpful
later in identifying the source of the conflict. (For example,
`--conflict-suffix dropboxconflict,laptopconflict`)

With `--conflict-loser num`, a number is always appended to the suffix. With
`--conflict-loser pathname`, a number is appended only when one suffix is
specified (or when two identical suffixes are specified.) i.e. with
`--conflict-loser pathname`, all of the following would produce exactly the
same result:

```
--conflict-suffix path
--conflict-suffix path,path
--conflict-suffix path1,path2
```

Suffixes may be as short as 1 character. By default, the suffix is appended
after any other extensions (ex. `file.jpg.conflict1`), however, this can be
changed with the `--suffix-keep-extension` flag (i.e. to instead result in
`file.conflict1.jpg`).

`--conflict-suffix` supports several *dynamic date variables* when enclosed in
curly braces as globs. This can be helpful to track the date and/or time that
each conflict was handled by bisync. For example:

```
--conflict-suffix {DateOnly}-conflict
// result: myfile.txt.2006-01-02-conflict1
```

All of the formats described [here](https://pkg.go.dev/time#pkg-constants) and
[here](https://pkg.go.dev/time#example-Time.Format) are supported, but take
care to ensure that your chosen format does not use any characters that are
illegal on your remotes (for example, macOS does not allow colons in
filenames, and slashes are also best avoided as they are often interpreted as
directory separators.) To address this particular issue, an additional
`{MacFriendlyTime}` (or just `{mac}`) option is supported, which results in
`2006-01-02 0304PM`.

Note that `--conflict-suffix` is entirely separate from rclone's main `--sufix`
flag. This is intentional, as users may wish to use both flags simultaneously,
if also using `--backup-dir`.

Finally, note that the default in bisync prior to `v1.66` was to rename
conflicts with `..path1` and `..path2` (with two periods, and `path` instead of
`conflict`.) Bisync now defaults to a single dot instead of a double dot, but
additional dots can be added by including them in the specified suffix string.
For example, for behavior equivalent to the previous default, use:

```
[--conflict-resolve none] --conflict-loser pathname --conflict-suffix .path
```

cmd/bisync/bilib/names.go

@@ -5,6 +5,8 @@ import (
 	"os"
 	"sort"
 	"strconv"
+	"strings"
+	"time"
 )
 
 // Names comprises a set of file names
@@ -83,3 +85,81 @@ func (am AliasMap) Alias(name1 string) string {
 	}
 	return name1
 }
+
+// ParseGlobs determines whether a string contains {brackets}
+// and returns the substring (including both brackets) for replacing
+// substring is first opening bracket to last closing bracket --
+// good for {{this}} but not {this}{this}
+func ParseGlobs(s string) (hasGlobs bool, substring string) {
+	open := strings.Index(s, "{")
+	close := strings.LastIndex(s, "}")
+	if open >= 0 && close > open {
+		return true, s[open : close+1]
+	}
+	return false, ""
+}
+
+// TrimBrackets converts {{this}} to this
+func TrimBrackets(s string) string {
+	return strings.Trim(s, "{}")
+}
+
+// TimeFormat converts a user-supplied string to a Go time constant, if possible
+func TimeFormat(timeFormat string) string {
+	switch timeFormat {
+	case "Layout":
+		timeFormat = time.Layout
+	case "ANSIC":
+		timeFormat = time.ANSIC
+	case "UnixDate":
+		timeFormat = time.UnixDate
+	case "RubyDate":
+		timeFormat = time.RubyDate
+	case "RFC822":
+		timeFormat = time.RFC822
+	case "RFC822Z":
+		timeFormat = time.RFC822Z
+	case "RFC850":
+		timeFormat = time.RFC850
+	case "RFC1123":
+		timeFormat = time.RFC1123
+	case "RFC1123Z":
+		timeFormat = time.RFC1123Z
+	case "RFC3339":
+		timeFormat = time.RFC3339
+	case "RFC3339Nano":
+		timeFormat = time.RFC3339Nano
+	case "Kitchen":
+		timeFormat = time.Kitchen
+	case "Stamp":
+		timeFormat = time.Stamp
+	case "StampMilli":
+		timeFormat = time.StampMilli
+	case "StampMicro":
+		timeFormat = time.StampMicro
+	case "StampNano":
+		timeFormat = time.StampNano
+	case "DateTime":
+		// timeFormat = time.DateTime // missing in go1.19
+		timeFormat = "2006-01-02 15:04:05"
+	case "DateOnly":
+		// timeFormat = time.DateOnly // missing in go1.19
+		timeFormat = "2006-01-02"
+	case "TimeOnly":
+		// timeFormat = time.TimeOnly // missing in go1.19
+		timeFormat = "15:04:05"
+	case "MacFriendlyTime", "macfriendlytime", "mac":
+		timeFormat = "2006-01-02 0304PM" // not actually a Go constant -- but useful as macOS filenames can't have colons
+	}
+	return timeFormat
+}
+
+// AppyTimeGlobs converts "myfile-{DateOnly}.txt" to "myfile-2006-01-02.txt"
+func AppyTimeGlobs(s string, t time.Time) string {
+	hasGlobs, substring := ParseGlobs(s)
+	if !hasGlobs {
+		return s
+	}
+	timeString := t.Local().Format(TimeFormat(TrimBrackets(substring)))
+	return strings.ReplaceAll(s, substring, timeString)
+}

cmd/bisync/bisync_test.go

@@ -118,6 +118,9 @@ var logHoppers = []string{
 
 	// Test case `normalization` can have random order of fix-case files.
 	`(?:INFO  |NOTICE): .*: Fixed case by renaming to: .*`,
+
+	// order of files re-checked prior to a conflict rename
+	`ERROR : .*: md5 differ.*`,
 }
 
 // Some log lines can contain Windows path separator that must be
@@ -853,6 +856,12 @@ func (b *bisyncTest) runBisync(ctx context.Context, args []string) (err error) {
 			ci.NoUnicodeNormalization = false
 			ci.IgnoreCaseSync = true
 			ci.FixCase = true
+		case "conflict-resolve":
+			_ = opt.ConflictResolve.Set(val)
+		case "conflict-loser":
+			_ = opt.ConflictLoser.Set(val)
+		case "conflict-suffix":
+			opt.ConflictSuffixFlag = val
 		default:
 			return fmt.Errorf("invalid bisync option %q", arg)
 		}

cmd/bisync/cmd.go

@@ -55,6 +55,11 @@ type Options struct {
 	CompareFlag           string
 	DebugName             string
 	MaxLock               time.Duration
+	ConflictResolve       Prefer
+	ConflictLoser         ConflictLoserAction
+	ConflictSuffixFlag    string
+	ConflictSuffix1       string
+	ConflictSuffix2       string
 }
 
 // Default values
@@ -141,6 +146,9 @@ func init() {
 	flags.BoolVarP(cmdFlags, &Opt.Compare.SlowHashSyncOnly, "slow-hash-sync-only", "", Opt.Compare.SlowHashSyncOnly, "Ignore slow checksums for listings and deltas, but still consider them during sync calls.", "")
 	flags.BoolVarP(cmdFlags, &Opt.Compare.DownloadHash, "download-hash", "", Opt.Compare.DownloadHash, "Compute hash by downloading when otherwise unavailable. (warning: may be slow and use lots of data!)", "")
 	flags.DurationVarP(cmdFlags, &Opt.MaxLock, "max-lock", "", Opt.MaxLock, "Consider lock files older than this to be expired (default: 0 (never expire)) (minimum: 2m)", "")
+	flags.FVarP(cmdFlags, &Opt.ConflictResolve, "conflict-resolve", "", "Automatically resolve conflicts by preferring the version that is: "+ConflictResolveList+" (default: none)", "")
+	flags.FVarP(cmdFlags, &Opt.ConflictLoser, "conflict-loser", "", "Action to take on the loser of a sync conflict (when there is a winner) or on both files (when there is no winner): "+ConflictLoserList+" (default: num)", "")
+	flags.StringVarP(cmdFlags, &Opt.ConflictSuffixFlag, "conflict-suffix", "", Opt.ConflictSuffixFlag, "Suffix to use when renaming a --conflict-loser. Can be either one string or two comma-separated strings to assign different suffixes to Path1/Path2. (default: 'conflict')", "")
 }
 
 // bisync command definition
@@ -154,6 +162,8 @@ var commandDefinition = &cobra.Command{
 		"status":            "Beta",
 	},
 	RunE: func(command *cobra.Command, args []string) error {
+		// NOTE: avoid putting too much handling here, as it won't apply to the rc.
+		// Generally it's best to put init-type stuff in Bisync() (operations.go)
 		cmd.CheckArgs(2, 2, command, args)
 		fs1, file1, fs2, file2 := cmd.NewFsSrcDstFiles(args)
 		if file1 != "" || file2 != "" {

cmd/bisync/deltas.go

@@ -8,11 +8,11 @@ import (
 	"path/filepath"
 	"sort"
 	"strings"
+	"time"
 
 	"github.com/rclone/rclone/cmd/bisync/bilib"
 	"github.com/rclone/rclone/fs"
 	"github.com/rclone/rclone/fs/filter"
-	"github.com/rclone/rclone/fs/operations"
 	"github.com/rclone/rclone/lib/terminal"
 	"golang.org/x/text/unicode/norm"
 )
@@ -46,6 +46,7 @@ func (d delta) is(cond delta) bool {
 type deltaSet struct {
 	deltas     map[string]delta
 	size       map[string]int64
+	time       map[string]time.Time
 	hash       map[string]string
 	opt        *Options
 	fs         fs.Fs  // base filesystem
@@ -170,6 +171,7 @@ func (b *bisyncRun) findDeltas(fctx context.Context, f fs.Fs, oldListing string,
 	ds = &deltaSet{
 		deltas:     map[string]delta{},
 		size:       map[string]int64{},
+		time:       map[string]time.Time{},
 		hash:       map[string]string{},
 		fs:         f,
 		msg:        msg,
@@ -183,6 +185,7 @@ func (b *bisyncRun) findDeltas(fctx context.Context, f fs.Fs, oldListing string,
 		d := deltaZero
 		s := int64(0)
 		h := ""
+		var t time.Time
 		if !now.has(file) {
 			b.indent(msg, file, Color(terminal.RedFg, "File was deleted"))
 			ds.deleted++
@@ -215,6 +218,7 @@ func (b *bisyncRun) findDeltas(fctx context.Context, f fs.Fs, oldListing string,
 							whatchanged = append(whatchanged, Color(terminal.MagentaFg, "time (older)"))
 							d |= deltaOlder
 						}
+						t = now.getTime(file)
 					}
 				}
 				if b.opt.Compare.Checksum {
@@ -238,6 +242,9 @@ func (b *bisyncRun) findDeltas(fctx context.Context, f fs.Fs, oldListing string,
 			if b.opt.Compare.Size {
 				ds.size[file] = s
 			}
+			if b.opt.Compare.Modtime {
+				ds.time[file] = t
+			}
 			if b.opt.Compare.Checksum {
 				ds.hash[file] = h
 			}
@@ -258,6 +265,9 @@ func (b *bisyncRun) findDeltas(fctx context.Context, f fs.Fs, oldListing string,
 			if b.opt.Compare.Size {
 				ds.size[file] = now.getSize(file)
 			}
+			if b.opt.Compare.Modtime {
+				ds.time[file] = now.getTime(file)
+			}
 			if b.opt.Compare.Checksum {
 				ds.hash[file] = now.getHash(file)
 			}
@@ -287,12 +297,11 @@ func (b *bisyncRun) applyDeltas(ctx context.Context, ds1, ds2 *deltaSet) (change
 	delete1 := bilib.Names{}
 	delete2 := bilib.Names{}
 	handled := bilib.Names{}
-	renamed1 := bilib.Names{}
-	renamed2 := bilib.Names{}
 	renameSkipped := bilib.Names{}
 	deletedonboth := bilib.Names{}
 	skippedDirs1 := newFileList()
 	skippedDirs2 := newFileList()
+	b.renames = renames{}
 
 	ctxMove := b.opt.setDryRun(ctx)
 
@@ -422,34 +431,10 @@ func (b *bisyncRun) applyDeltas(ctx context.Context, ds1, ds2 *deltaSet) (change
 						}
 					} else {
 						fs.Debugf(nil, "Files are NOT equal: %s", file)
-						b.indent("!Path1", p1+"..path1", "Renaming Path1 copy")
-						ctxMove = b.setBackupDir(ctxMove, 1) // in case already a file with new name
-						if err = operations.MoveFile(ctxMove, b.fs1, b.fs1, file+"..path1", file); err != nil {
-							err = fmt.Errorf("path1 rename failed for %s: %w", p1, err)
-							b.critical = true
+						err = b.resolve(ctxMove, path1, path2, file, alias, &renameSkipped, &copy1to2, &copy2to1, ds1, ds2)
+						if err != nil {
 							return
 						}
-						if b.opt.DryRun {
-							renameSkipped.Add(file)
-						} else {
-							renamed1.Add(file)
-						}
-						b.indent("!Path1", p2+"..path1", "Queue copy to Path2")
-						copy1to2.Add(file + "..path1")
-
-						b.indent("!Path2", p2+"..path2", "Renaming Path2 copy")
-						ctxMove = b.setBackupDir(ctxMove, 2) // in case already a file with new name
-						if err = operations.MoveFile(ctxMove, b.fs2, b.fs2, alias+"..path2", alias); err != nil {
-							err = fmt.Errorf("path2 rename failed for %s: %w", alias, err)
-							return
-						}
-						if b.opt.DryRun {
-							renameSkipped.Add(alias)
-						} else {
-							renamed2.Add(alias)
-						}
-						b.indent("!Path2", p1+"..path2", "Queue copy to Path1")
-						copy2to1.Add(alias + "..path2")
 					}
 				}
 				handled.Add(file)
@@ -554,8 +539,6 @@ func (b *bisyncRun) applyDeltas(ctx context.Context, ds1, ds2 *deltaSet) (change
 
 	queues.copy1to2 = copy1to2
 	queues.copy2to1 = copy2to1
-	queues.renamed1 = renamed1
-	queues.renamed2 = renamed2
 	queues.renameSkipped = renameSkipped
 	queues.deletedonboth = deletedonboth
 	queues.skippedDirs1 = skippedDirs1

cmd/bisync/listing.go

@@ -77,6 +77,10 @@ func (ls *fileList) empty() bool {
 }
 
 func (ls *fileList) has(file string) bool {
+	if file == "" {
+		fs.Debugf(nil, "called ls.has() with blank string")
+		return false
+	}
 	_, found := ls.info[file]
 	if !found {
 		//try unquoting
@@ -467,11 +471,9 @@ func ConvertPrecision(Modtime time.Time, dst fs.Fs) time.Time {
 // modifyListing will modify the listing based on the results of the sync
 func (b *bisyncRun) modifyListing(ctx context.Context, src fs.Fs, dst fs.Fs, results []Results, queues queues, is1to2 bool) (err error) {
 	queue := queues.copy2to1
-	renames := queues.renamed2
 	direction := "2to1"
 	if is1to2 {
 		queue = queues.copy1to2
-		renames = queues.renamed1
 		direction = "1to2"
 	}
 
@@ -596,37 +598,39 @@ func (b *bisyncRun) modifyListing(ctx context.Context, src fs.Fs, dst fs.Fs, res
 			dstList.remove(file)
 		}
 	}
-	if renames.NotEmpty() && !b.opt.DryRun {
+	if b.renames.NotEmpty() && !b.opt.DryRun {
 		// renamed on src and copied to dst
-		renamesList := renames.ToList()
-		for _, file := range renamesList {
+		for _, rename := range b.renames {
+			srcOldName, srcNewName, dstOldName, dstNewName := rename.getNames(is1to2)
+			fs.Debugf(nil, "%s: srcOldName: %v srcNewName: %v dstOldName: %v dstNewName: %v", direction, srcOldName, srcNewName, dstOldName, dstNewName)
 			// we'll handle the other side when we go the other direction
-			newName := file + "..path2"
-			oppositeName := file + "..path1"
-			if is1to2 {
-				newName = file + "..path1"
-				oppositeName = file + "..path2"
-			}
 			var new *fileInfo
-			// we prefer to get the info from the ..path1 / ..path2 versions
+			// we prefer to get the info from the newNamed versions
 			// since they were actually copied as opposed to operations.MoveFile()'d.
 			// the size/time/hash info is therefore fresher on the renames
 			// but we'll settle for the original if we have to.
-			if srcList.has(newName) {
-				new = srcList.get(newName)
-			} else if srcList.has(oppositeName) {
-				new = srcList.get(oppositeName)
-			} else if srcList.has(file) {
-				new = srcList.get(file)
+			if srcList.has(srcNewName) {
+				new = srcList.get(srcNewName)
+			} else if srcList.has(dstNewName) {
+				new = srcList.get(dstNewName)
+			} else if srcList.has(srcOldName) {
+				new = srcList.get(srcOldName)
 			} else {
-				if err := filterRecheck.AddFile(file); err != nil {
-					fs.Debugf(file, "error adding file to recheck filter: %v", err)
+				// something's odd, so let's recheck
+				if err := filterRecheck.AddFile(srcOldName); err != nil {
+					fs.Debugf(srcOldName, "error adding file to recheck filter: %v", err)
 				}
 			}
-			srcList.put(newName, new.size, new.time, new.hash, new.id, new.flags)
-			dstList.put(newName, new.size, ConvertPrecision(new.time, src), new.hash, new.id, new.flags)
-			srcList.remove(file)
-			dstList.remove(file)
+			if srcNewName != "" { // if it was renamed and not deleted
+				srcList.put(srcNewName, new.size, new.time, new.hash, new.id, new.flags)
+				dstList.put(srcNewName, new.size, ConvertPrecision(new.time, src), new.hash, new.id, new.flags)
+			}
+			if srcNewName != srcOldName {
+				srcList.remove(srcOldName)
+			}
+			if srcNewName != dstOldName {
+				dstList.remove(dstOldName)
+			}
 		}
 	}
 

cmd/bisync/operations.go

@@ -49,13 +49,12 @@ type bisyncRun struct {
 	CancelSync         context.CancelFunc
 	DebugName          string
 	lockFile           string
+	renames            renames
 }
 
 type queues struct {
 	copy1to2      bilib.Names
 	copy2to1      bilib.Names
-	renamed1      bilib.Names // renamed on 1 and copied to 2
-	renamed2      bilib.Names // renamed on 2 and copied to 1
 	renameSkipped bilib.Names // not renamed because it was equal
 	skippedDirs1  *fileList
 	skippedDirs2  *fileList
@@ -86,6 +85,10 @@ func Bisync(ctx context.Context, fs1, fs2 fs.Fs, optArg *Options) (err error) {
 	if err != nil {
 		return err
 	}
+	err = b.setResolveDefaults(ctx)
+	if err != nil {
+		return err
+	}
 
 	if b.workDir, err = filepath.Abs(opt.Workdir); err != nil {
 		return fmt.Errorf("failed to make workdir absolute: %w", err)

cmd/bisync/resolve.go

@@ -0,0 +1,450 @@
+package bisync
+
+import (
+	"context"
+	"fmt"
+	"math"
+	"mime"
+	"path"
+	"strings"
+	"time"
+
+	"github.com/rclone/rclone/cmd/bisync/bilib"
+	"github.com/rclone/rclone/fs"
+	"github.com/rclone/rclone/fs/operations"
+	"github.com/rclone/rclone/lib/terminal"
+)
+
+// Prefer describes strategies for resolving sync conflicts
+type Prefer = fs.Enum[preferChoices]
+
+// Supported --conflict-resolve strategies
+const (
+	PreferNone Prefer = iota
+	PreferPath1
+	PreferPath2
+	PreferNewer
+	PreferOlder
+	PreferLarger
+	PreferSmaller
+)
+
+type preferChoices struct{}
+
+func (preferChoices) Choices() []string {
+	return []string{
+		PreferNone:    "none",
+		PreferNewer:   "newer",
+		PreferOlder:   "older",
+		PreferLarger:  "larger",
+		PreferSmaller: "smaller",
+		PreferPath1:   "path1",
+		PreferPath2:   "path2",
+	}
+}
+
+func (preferChoices) Type() string {
+	return "Prefer"
+}
+
+// ConflictResolveList is a list of --conflict-resolve flag choices used in the help
+var ConflictResolveList = Opt.ConflictResolve.Help()
+
+// ConflictLoserAction describes possible actions to take on the loser of a sync conflict
+type ConflictLoserAction = fs.Enum[conflictLoserChoices]
+
+// Supported --conflict-loser actions
+const (
+	ConflictLoserSkip     ConflictLoserAction = iota // Reserved as zero but currently unused
+	ConflictLoserNumber                              // file.conflict1, file.conflict2, file.conflict3, etc.
+	ConflictLoserPathname                            // file.path1, file.path2
+	ConflictLoserDelete                              // delete the loser, keep winner only
+)
+
+type conflictLoserChoices struct{}
+
+func (conflictLoserChoices) Choices() []string {
+	return []string{
+		ConflictLoserNumber:   "num",
+		ConflictLoserPathname: "pathname",
+		ConflictLoserDelete:   "delete",
+	}
+}
+
+func (conflictLoserChoices) Type() string {
+	return "ConflictLoserAction"
+}
+
+// ConflictLoserList is a list of --conflict-loser flag choices used in the help
+var ConflictLoserList = Opt.ConflictLoser.Help()
+
+func (b *bisyncRun) setResolveDefaults(ctx context.Context) error {
+	if b.opt.ConflictLoser == ConflictLoserSkip {
+		b.opt.ConflictLoser = ConflictLoserNumber
+	}
+	if b.opt.ConflictSuffixFlag == "" {
+		b.opt.ConflictSuffixFlag = "conflict"
+	}
+	suffixes := strings.Split(b.opt.ConflictSuffixFlag, ",")
+	if len(suffixes) == 1 {
+		b.opt.ConflictSuffix1 = suffixes[0]
+		b.opt.ConflictSuffix2 = suffixes[0]
+	} else if len(suffixes) == 2 {
+		b.opt.ConflictSuffix1 = suffixes[0]
+		b.opt.ConflictSuffix2 = suffixes[1]
+	} else {
+		return fmt.Errorf("--conflict-suffix cannot have more than 2 comma-separated values. Received %v: %v", len(suffixes), suffixes)
+	}
+	// replace glob variables, if any
+	t := time.Now() // capture static time here so it is the same for all files throughout this run
+	b.opt.ConflictSuffix1 = bilib.AppyTimeGlobs(b.opt.ConflictSuffix1, t)
+	b.opt.ConflictSuffix2 = bilib.AppyTimeGlobs(b.opt.ConflictSuffix2, t)
+
+	// append dot (intentionally allow more than one)
+	b.opt.ConflictSuffix1 = "." + b.opt.ConflictSuffix1
+	b.opt.ConflictSuffix2 = "." + b.opt.ConflictSuffix2
+
+	// checks and warnings
+	if (b.opt.ConflictResolve == PreferNewer || b.opt.ConflictResolve == PreferOlder) && (b.fs1.Precision() == fs.ModTimeNotSupported || b.fs2.Precision() == fs.ModTimeNotSupported) {
+		fs.Logf(nil, Color(terminal.YellowFg, "WARNING: ignoring --conflict-resolve %s as at least one remote does not support modtimes."), b.opt.ConflictResolve.String())
+		b.opt.ConflictResolve = PreferNone
+	} else if (b.opt.ConflictResolve == PreferNewer || b.opt.ConflictResolve == PreferOlder) && !b.opt.Compare.Modtime {
+		fs.Logf(nil, Color(terminal.YellowFg, "WARNING: ignoring --conflict-resolve %s as --compare does not include modtime."), b.opt.ConflictResolve.String())
+		b.opt.ConflictResolve = PreferNone
+	}
+	if (b.opt.ConflictResolve == PreferLarger || b.opt.ConflictResolve == PreferSmaller) && !b.opt.Compare.Size {
+		fs.Logf(nil, Color(terminal.YellowFg, "WARNING: ignoring --conflict-resolve %s as --compare does not include size."), b.opt.ConflictResolve.String())
+		b.opt.ConflictResolve = PreferNone
+	}
+
+	return nil
+}
+
+type renames map[string]renamesInfo // [originalName]newName (remember the originalName may have an alias)
+// the newName may be the same as the old name (if winner), but should not be blank, unless we're deleting.
+// the oldNames may not match each other, if we're normalizing case or unicode
+// all names should be "remotes" (relative names, without base path)
+type renamesInfo struct {
+	path1 namePair
+	path2 namePair
+}
+type namePair struct {
+	oldName string
+	newName string
+}
+
+func (b *bisyncRun) resolve(ctxMove context.Context, path1, path2, file, alias string, renameSkipped, copy1to2, copy2to1 *bilib.Names, ds1, ds2 *deltaSet) error {
+	winningPath := 0
+	if b.opt.ConflictResolve != PreferNone {
+		winningPath = b.conflictWinner(ds1, ds2, file, alias)
+		if winningPath > 0 {
+			fs.Infof(file, Color(terminal.GreenFg, "The winner is: Path%d"), winningPath)
+		} else {
+			fs.Infof(file, Color(terminal.RedFg, "A winner could not be determined."))
+		}
+	}
+
+	suff1 := b.opt.ConflictSuffix1 // copy to new var to make sure our changes here don't persist
+	suff2 := b.opt.ConflictSuffix2
+	if b.opt.ConflictLoser == ConflictLoserPathname && b.opt.ConflictSuffix1 == b.opt.ConflictSuffix2 {
+		// numerate, but not if user supplied two different suffixes
+		suff1 += "1"
+		suff2 += "2"
+	}
+
+	r := renamesInfo{
+		path1: namePair{
+			oldName: file,
+			newName: SuffixName(ctxMove, file, suff1),
+		},
+		path2: namePair{
+			oldName: alias,
+			newName: SuffixName(ctxMove, alias, suff2),
+		},
+	}
+
+	// handle auto-numbering
+	// note that we still queue copies for both files, whether or not we renamed
+	// we also set these for ConflictLoserDelete in case there is no winner.
+	if b.opt.ConflictLoser == ConflictLoserNumber || b.opt.ConflictLoser == ConflictLoserDelete {
+		num := b.numerate(ctxMove, 1, file, alias)
+		switch winningPath {
+		case 1: // keep path1, rename path2
+			r.path1.newName = r.path1.oldName
+			r.path2.newName = SuffixName(ctxMove, r.path2.oldName, b.opt.ConflictSuffix2+fmt.Sprint(num))
+		case 2: // keep path2, rename path1
+			r.path1.newName = SuffixName(ctxMove, r.path1.oldName, b.opt.ConflictSuffix1+fmt.Sprint(num))
+			r.path2.newName = r.path2.oldName
+		default: // no winner, so rename both to different numbers (unless suffixes are already different)
+			if b.opt.ConflictSuffix1 == b.opt.ConflictSuffix2 {
+				r.path1.newName = SuffixName(ctxMove, r.path1.oldName, b.opt.ConflictSuffix1+fmt.Sprint(num))
+				// let's just make sure num + 1 is available...
+				num2 := b.numerate(ctxMove, num+1, file, alias)
+				r.path2.newName = SuffixName(ctxMove, r.path2.oldName, b.opt.ConflictSuffix2+fmt.Sprint(num2))
+			} else {
+				// suffixes are different, so numerate independently
+				num = b.numerateSingle(ctxMove, 1, file, alias, 1)
+				r.path1.newName = SuffixName(ctxMove, r.path1.oldName, b.opt.ConflictSuffix1+fmt.Sprint(num))
+				num = b.numerateSingle(ctxMove, 1, file, alias, 2)
+				r.path2.newName = SuffixName(ctxMove, r.path2.oldName, b.opt.ConflictSuffix2+fmt.Sprint(num))
+			}
+		}
+	}
+
+	// when winningPath == 0 (no winner), we ignore settings and rename both, do not delete
+	// note also that deletes and renames are mutually exclusive -- we never delete one path and rename the other.
+	if b.opt.ConflictLoser == ConflictLoserDelete && winningPath == 1 {
+		// delete 2, copy 1 to 2
+		err = b.delete(ctxMove, r.path2, path2, path1, b.fs2, 2, 1, renameSkipped)
+		if err != nil {
+			return err
+		}
+		r.path2.newName = ""
+		// copy the one that wasn't deleted
+		b.indent("Path1", r.path1.oldName, "Queue copy to Path2")
+		copy1to2.Add(r.path1.oldName)
+	} else if b.opt.ConflictLoser == ConflictLoserDelete && winningPath == 2 {
+		// delete 1, copy 2 to 1
+		err = b.delete(ctxMove, r.path1, path1, path2, b.fs1, 1, 2, renameSkipped)
+		if err != nil {
+			return err
+		}
+		r.path1.newName = ""
+		// copy the one that wasn't deleted
+		b.indent("Path2", r.path2.oldName, "Queue copy to Path1")
+		copy2to1.Add(r.path2.oldName)
+	} else {
+		err = b.rename(ctxMove, r.path1, path1, path2, b.fs1, 1, 2, winningPath, copy1to2, renameSkipped)
+		if err != nil {
+			return err
+		}
+		err = b.rename(ctxMove, r.path2, path2, path1, b.fs2, 2, 1, winningPath, copy2to1, renameSkipped)
+		if err != nil {
+			return err
+		}
+	}
+
+	b.renames[r.path1.oldName] = r // note map index is path1's oldName, which may be different from path2 if aliases
+	return nil
+}
+
+// SuffixName adds the current --conflict-suffix to the remote, obeying
+// --suffix-keep-extension if set
+// It is a close cousin of operations.SuffixName, but we don't want to
+// use ci.Suffix for this because it might be used for --backup-dir.
+func SuffixName(ctx context.Context, remote, suffix string) string {
+	if suffix == "" {
+		return remote
+	}
+	ci := fs.GetConfig(ctx)
+	if ci.SuffixKeepExtension {
+		var (
+			base  = remote
+			exts  = ""
+			first = true
+			ext   = path.Ext(remote)
+		)
+		for ext != "" {
+			// Look second and subsequent extensions in mime types.
+			// If they aren't found then don't keep it as an extension.
+			if !first && mime.TypeByExtension(ext) == "" {
+				break
+			}
+			base = base[:len(base)-len(ext)]
+			exts = ext + exts
+			first = false
+			ext = path.Ext(base)
+		}
+		return base + suffix + exts
+	}
+	return remote + suffix
+}
+
+// NotEmpty checks whether set is not empty
+func (r renames) NotEmpty() bool {
+	return len(r) > 0
+}
+
+func (ri *renamesInfo) getNames(is1to2 bool) (srcOldName, srcNewName, dstOldName, dstNewName string) {
+	if is1to2 {
+		return ri.path1.oldName, ri.path1.newName, ri.path2.oldName, ri.path2.newName
+	}
+	return ri.path2.oldName, ri.path2.newName, ri.path1.oldName, ri.path1.newName
+}
+
+// work out the lowest number that niether side has, return it for suffix
+func (b *bisyncRun) numerate(ctx context.Context, startnum int, file, alias string) int {
+	for i := startnum; i < math.MaxInt; i++ {
+		iStr := fmt.Sprint(i)
+		if !ls1.has(SuffixName(ctx, file, b.opt.ConflictSuffix1+iStr)) &&
+			!ls1.has(SuffixName(ctx, alias, b.opt.ConflictSuffix1+iStr)) &&
+			!ls2.has(SuffixName(ctx, file, b.opt.ConflictSuffix2+iStr)) &&
+			!ls2.has(SuffixName(ctx, alias, b.opt.ConflictSuffix2+iStr)) {
+			// make sure it still holds true with suffixes switched (it should)
+			if !ls1.has(SuffixName(ctx, file, b.opt.ConflictSuffix2+iStr)) &&
+				!ls1.has(SuffixName(ctx, alias, b.opt.ConflictSuffix2+iStr)) &&
+				!ls2.has(SuffixName(ctx, file, b.opt.ConflictSuffix1+iStr)) &&
+				!ls2.has(SuffixName(ctx, alias, b.opt.ConflictSuffix1+iStr)) {
+				fs.Debugf(file, "The first available suffix is: %s", iStr)
+				return i
+			}
+		}
+	}
+	return 0 // not really possible, as no one has 9223372036854775807 conflicts, and if they do, they have bigger problems
+}
+
+// like numerate, but consider only one side's suffix (for when suffixes are different)
+func (b *bisyncRun) numerateSingle(ctx context.Context, startnum int, file, alias string, path int) int {
+	lsA, lsB := ls1, ls2
+	suffix := b.opt.ConflictSuffix1
+	if path == 2 {
+		lsA, lsB = ls2, ls1
+		suffix = b.opt.ConflictSuffix2
+	}
+	for i := startnum; i < math.MaxInt; i++ {
+		iStr := fmt.Sprint(i)
+		if !lsA.has(SuffixName(ctx, file, suffix+iStr)) &&
+			!lsA.has(SuffixName(ctx, alias, suffix+iStr)) &&
+			!lsB.has(SuffixName(ctx, file, suffix+iStr)) &&
+			!lsB.has(SuffixName(ctx, alias, suffix+iStr)) {
+			fs.Debugf(file, "The first available suffix is: %s", iStr)
+			return i
+		}
+	}
+	return 0 // not really possible, as no one has 9223372036854775807 conflicts, and if they do, they have bigger problems
+}
+
+func (b *bisyncRun) rename(ctx context.Context, thisNamePair namePair, thisPath, thatPath string, thisFs fs.Fs, thisPathNum, thatPathNum, winningPath int, q, renameSkipped *bilib.Names) error {
+	if winningPath == thisPathNum {
+		b.indent(fmt.Sprintf("!Path%d", thisPathNum), thisPath+thisNamePair.newName, fmt.Sprintf("Not renaming Path%d copy, as it was determined the winner", thisPathNum))
+	} else {
+		skip := operations.SkipDestructive(ctx, thisNamePair.oldName, "rename")
+		if !skip {
+			b.indent(fmt.Sprintf("!Path%d", thisPathNum), thisPath+thisNamePair.newName, fmt.Sprintf("Renaming Path%d copy", thisPathNum))
+			ctx = b.setBackupDir(ctx, thisPathNum) // in case already a file with new name
+			if err = operations.MoveFile(ctx, thisFs, thisFs, thisNamePair.newName, thisNamePair.oldName); err != nil {
+				err = fmt.Errorf("%s rename failed for %s: %w", thisPath, thisPath+thisNamePair.oldName, err)
+				b.critical = true
+				return err
+			}
+		} else {
+			renameSkipped.Add(thisNamePair.oldName) // (due to dry-run, not equality)
+		}
+	}
+	b.indent(fmt.Sprintf("!Path%d", thisPathNum), thatPath+thisNamePair.newName, fmt.Sprintf("Queue copy to Path%d", thatPathNum))
+	q.Add(thisNamePair.newName)
+	return nil
+}
+
+func (b *bisyncRun) delete(ctx context.Context, thisNamePair namePair, thisPath, thatPath string, thisFs fs.Fs, thisPathNum, thatPathNum int, renameSkipped *bilib.Names) error {
+	skip := operations.SkipDestructive(ctx, thisNamePair.oldName, "delete")
+	if !skip {
+		b.indent(fmt.Sprintf("!Path%d", thisPathNum), thisPath+thisNamePair.oldName, fmt.Sprintf("Deleting Path%d copy", thisPathNum))
+		ctx = b.setBackupDir(ctx, thisPathNum)
+		ci := fs.GetConfig(ctx)
+		var backupDir fs.Fs
+		if ci.BackupDir != "" {
+			backupDir, err = operations.BackupDir(ctx, thisFs, thisFs, thisNamePair.oldName)
+			if err != nil {
+				b.critical = true
+				return err
+			}
+		}
+		obj, err := thisFs.NewObject(ctx, thisNamePair.oldName)
+		if err != nil {
+			b.critical = true
+			return err
+		}
+		if err = operations.DeleteFileWithBackupDir(ctx, obj, backupDir); err != nil {
+			err = fmt.Errorf("%s delete failed for %s: %w", thisPath, thisPath+thisNamePair.oldName, err)
+			b.critical = true
+			return err
+		}
+	} else {
+		renameSkipped.Add(thisNamePair.oldName) // (due to dry-run, not equality)
+	}
+	return nil
+}
+
+func (b *bisyncRun) conflictWinner(ds1, ds2 *deltaSet, remote1, remote2 string) int {
+	switch b.opt.ConflictResolve {
+	case PreferPath1:
+		return 1
+	case PreferPath2:
+		return 2
+	case PreferNewer, PreferOlder:
+		return b.resolveNewerOlder(ds1, ds2, remote1, remote2, b.opt.ConflictResolve)
+	case PreferLarger, PreferSmaller:
+		return b.resolveLargerSmaller(ds1, ds2, remote1, remote2, b.opt.ConflictResolve)
+	default:
+		return 0
+	}
+}
+
+// returns the winning path number, or 0 if winner can't be determined
+func (b *bisyncRun) resolveNewerOlder(ds1, ds2 *deltaSet, remote1, remote2 string, prefer Prefer) int {
+	if fs.GetModifyWindow(b.octx, b.fs1, b.fs2) == fs.ModTimeNotSupported {
+		fs.Infof(remote1, "Winner cannot be determined as at least one path lacks modtime support.")
+		return 0
+	}
+	t1, t2 := ds1.time[remote1], ds2.time[remote2]
+	if t1.IsZero() || t2.IsZero() {
+		fs.Infof(remote1, "Winner cannot be determined as at least one modtime is missing. Path1: %v, Path2: %v", t1, t2)
+		return 0
+	}
+	if t1.After(t2) {
+		if prefer == PreferNewer {
+			fs.Infof(remote1, "Path1 is newer. Path1: %v, Path2: %v, Difference: %s", t1, t2, t1.Sub(t2))
+			return 1
+		} else if prefer == PreferOlder {
+			fs.Infof(remote1, "Path2 is older. Path1: %v, Path2: %v, Difference: %s", t1, t2, t1.Sub(t2))
+			return 2
+		}
+	} else if t1.Before(t2) {
+		if prefer == PreferNewer {
+			fs.Infof(remote1, "Path2 is newer. Path1: %v, Path2: %v, Difference: %s", t1, t2, t2.Sub(t1))
+			return 2
+		} else if prefer == PreferOlder {
+			fs.Infof(remote1, "Path1 is older. Path1: %v, Path2: %v, Difference: %s", t1, t2, t2.Sub(t1))
+			return 1
+		}
+	}
+	if t1.Equal(t2) {
+		fs.Infof(remote1, "Winner cannot be determined as times are equal. Path1: %v, Path2: %v, Difference: %s", t1, t2, t2.Sub(t1))
+		return 0
+	}
+	fs.Errorf(remote1, "Winner cannot be determined. Path1: %v, Path2: %v", t1, t2) // shouldn't happen unless prefer is of wrong type
+	return 0
+}
+
+// returns the winning path number, or 0 if winner can't be determined
+func (b *bisyncRun) resolveLargerSmaller(ds1, ds2 *deltaSet, remote1, remote2 string, prefer Prefer) int {
+	s1, s2 := ds1.size[remote1], ds2.size[remote2]
+	if s1 < 0 || s2 < 0 {
+		fs.Infof(remote1, "Winner cannot be determined as at least one size is unknown. Path1: %v, Path2: %v", s1, s2)
+		return 0
+	}
+	if s1 > s2 {
+		if prefer == PreferLarger {
+			fs.Infof(remote1, "Path1 is larger. Path1: %v, Path2: %v, Difference: %v", s1, s2, s1-s2)
+			return 1
+		} else if prefer == PreferSmaller {
+			fs.Infof(remote1, "Path2 is smaller. Path1: %v, Path2: %v, Difference: %v", s1, s2, s1-s2)
+			return 2
+		}
+	} else if s1 < s2 {
+		if prefer == PreferLarger {
+			fs.Infof(remote1, "Path2 is larger. Path1: %v, Path2: %v, Difference: %v", s1, s2, s2-s1)
+			return 2
+		} else if prefer == PreferSmaller {
+			fs.Infof(remote1, "Path1 is smaller. Path1: %v, Path2: %v, Difference: %v", s1, s2, s2-s1)
+			return 1
+		}
+	}
+	if s1 == s2 {
+		fs.Infof(remote1, "Winner cannot be determined as sizes are equal. Path1: %v, Path2: %v, Difference: %v", s1, s2, s1-s2)
+		return 0
+	}
+	fs.Errorf(remote1, "Winner cannot be determined. Path1: %v, Path2: %v", s1, s2) // shouldn't happen unless prefer is of wrong type
+	return 0
+}

cmd/bisync/testdata/test_backupdir/golden/_testdir_path1.._testdir_path2.copy1to2.que

@@ -1,5 +1,5 @@
 "file11.txt"
 "file2.txt"
 "file4.txt"
-"file5.txt..path1"
+"file5.txt.conflict1"
 "file7.txt"

cmd/bisync/testdata/test_backupdir/golden/_testdir_path1.._testdir_path2.copy2to1.que

@@ -1,5 +1,5 @@
 "file1.txt"
 "file10.txt"
 "file3.txt"
-"file5.txt..path2"
+"file5.txt.conflict2"
 "file6.txt"

cmd/bisync/testdata/test_backupdir/golden/_testdir_path1.._testdir_path2.path1.lst-err

@@ -4,7 +4,7 @@
 -       19 - - 2001-01-02T00:00:00.000000000+0000 "file10.txt"
 -       19 - - 2001-01-02T00:00:00.000000000+0000 "file11.txt"
 -       13 - - 2001-01-02T00:00:00.000000000+0000 "file2.txt"
--       39 - - 2001-03-04T00:00:00.000000000+0000 "file5.txt..path1"
--       39 - - 2001-01-02T00:00:00.000000000+0000 "file5.txt..path2"
+-       39 - - 2001-03-04T00:00:00.000000000+0000 "file5.txt.conflict1"
+-       39 - - 2001-01-02T00:00:00.000000000+0000 "file5.txt.conflict2"
 -       19 - - 2001-01-02T00:00:00.000000000+0000 "file6.txt"
 -       19 - - 2001-01-02T00:00:00.000000000+0000 "file7.txt"

cmd/bisync/testdata/test_backupdir/golden/_testdir_path1.._testdir_path2.path1.lst-new

@@ -4,7 +4,7 @@
 -       19 - - 2001-01-02T00:00:00.000000000+0000 "file10.txt"
 -       19 - - 2001-01-02T00:00:00.000000000+0000 "file11.txt"
 -       13 - - 2001-01-02T00:00:00.000000000+0000 "file2.txt"
--       39 - - 2001-03-04T00:00:00.000000000+0000 "file5.txt..path1"
--       39 - - 2001-01-02T00:00:00.000000000+0000 "file5.txt..path2"
+-       39 - - 2001-03-04T00:00:00.000000000+0000 "file5.txt.conflict1"
+-       39 - - 2001-01-02T00:00:00.000000000+0000 "file5.txt.conflict2"
 -       19 - - 2001-01-02T00:00:00.000000000+0000 "file6.txt"
 -       19 - - 2001-01-02T00:00:00.000000000+0000 "file7.txt"

cmd/bisync/testdata/test_backupdir/golden/_testdir_path1.._testdir_path2.path1.lst-old

@@ -4,7 +4,7 @@
 -       19 - - 2001-01-02T00:00:00.000000000+0000 "file10.txt"
 -       19 - - 2001-01-02T00:00:00.000000000+0000 "file11.txt"
 -       13 - - 2001-01-02T00:00:00.000000000+0000 "file2.txt"
--       39 - - 2001-03-04T00:00:00.000000000+0000 "file5.txt..path1"
--       39 - - 2001-01-02T00:00:00.000000000+0000 "file5.txt..path2"
+-       39 - - 2001-03-04T00:00:00.000000000+0000 "file5.txt.conflict1"
+-       39 - - 2001-01-02T00:00:00.000000000+0000 "file5.txt.conflict2"
 -       19 - - 2001-01-02T00:00:00.000000000+0000 "file6.txt"
 -       19 - - 2001-01-02T00:00:00.000000000+0000 "file7.txt"

cmd/bisync/testdata/test_backupdir/golden/_testdir_path1.._testdir_path2.path2.lst-err

@@ -4,7 +4,7 @@
 -       19 - - 2001-01-02T00:00:00.000000000+0000 "file10.txt"
 -       19 - - 2001-01-02T00:00:00.000000000+0000 "file11.txt"
 -       13 - - 2001-01-02T00:00:00.000000000+0000 "file2.txt"
--       39 - - 2001-03-04T00:00:00.000000000+0000 "file5.txt..path1"
--       39 - - 2001-01-02T00:00:00.000000000+0000 "file5.txt..path2"
+-       39 - - 2001-03-04T00:00:00.000000000+0000 "file5.txt.conflict1"
+-       39 - - 2001-01-02T00:00:00.000000000+0000 "file5.txt.conflict2"
 -       19 - - 2001-01-02T00:00:00.000000000+0000 "file6.txt"
 -       19 - - 2001-01-02T00:00:00.000000000+0000 "file7.txt"

cmd/bisync/testdata/test_backupdir/golden/_testdir_path1.._testdir_path2.path2.lst-new

@@ -4,7 +4,7 @@
 -       19 - - 2001-01-02T00:00:00.000000000+0000 "file10.txt"
 -       19 - - 2001-01-02T00:00:00.000000000+0000 "file11.txt"
 -       13 - - 2001-01-02T00:00:00.000000000+0000 "file2.txt"
--       39 - - 2001-03-04T00:00:00.000000000+0000 "file5.txt..path1"
--       39 - - 2001-01-02T00:00:00.000000000+0000 "file5.txt..path2"
+-       39 - - 2001-03-04T00:00:00.000000000+0000 "file5.txt.conflict1"
+-       39 - - 2001-01-02T00:00:00.000000000+0000 "file5.txt.conflict2"
 -       19 - - 2001-01-02T00:00:00.000000000+0000 "file6.txt"
 -       19 - - 2001-01-02T00:00:00.000000000+0000 "file7.txt"

cmd/bisync/testdata/test_backupdir/golden/_testdir_path1.._testdir_path2.path2.lst-old

@@ -4,7 +4,7 @@
 -       19 - - 2001-01-02T00:00:00.000000000+0000 "file10.txt"
 -       19 - - 2001-01-02T00:00:00.000000000+0000 "file11.txt"
 -       13 - - 2001-01-02T00:00:00.000000000+0000 "file2.txt"
--       39 - - 2001-03-04T00:00:00.000000000+0000 "file5.txt..path1"
--       39 - - 2001-01-02T00:00:00.000000000+0000 "file5.txt..path2"
+-       39 - - 2001-03-04T00:00:00.000000000+0000 "file5.txt.conflict1"
+-       39 - - 2001-01-02T00:00:00.000000000+0000 "file5.txt.conflict2"
 -       19 - - 2001-01-02T00:00:00.000000000+0000 "file6.txt"
 -       19 - - 2001-01-02T00:00:00.000000000+0000 "file7.txt"

cmd/bisync/testdata/test_backupdir/golden/test.log

@@ -101,10 +101,10 @@ INFO  : - Path1    Queue copy to Path2       - {
 INFO  : - Path1    Queue copy to Path2       - {path2/}file2.txt
 INFO  : - Path2    Queue delete              - {path2/}file4.txt
 NOTICE: - WARNING  New or changed in both paths       - file5.txt
-NOTICE: - Path1    Renaming Path1 copy                - {path1/}file5.txt..path1
-NOTICE: - Path1    Queue copy to Path2       - {path2/}file5.txt..path1
-NOTICE: - Path2    Renaming Path2 copy                - {path2/}file5.txt..path2
-NOTICE: - Path2    Queue copy to Path1       - {path1/}file5.txt..path2
+NOTICE: - Path1    Renaming Path1 copy                - {path1/}file5.txt.conflict1
+NOTICE: - Path1    Queue copy to Path2       - {path2/}file5.txt.conflict1
+NOTICE: - Path2    Renaming Path2 copy                - {path2/}file5.txt.conflict2
+NOTICE: - Path2    Queue copy to Path1       - {path1/}file5.txt.conflict2
 INFO  : - Path2    Queue copy to Path1       - {path1/}file6.txt
 INFO  : - Path1    Queue copy to Path2       - {path2/}file7.txt
 INFO  : - Path2    Queue copy to Path1       - {path1/}file1.txt

cmd/bisync/testdata/test_changes/golden/_testdir_path1.._testdir_path2.copy1to2.que

@@ -1,5 +1,5 @@
 "file11.txt"
 "file2.txt"
 "file4.txt"
-"file5.txt..path1"
+"file5.txt.conflict1"
 "file7.txt"

cmd/bisync/testdata/test_changes/golden/_testdir_path1.._testdir_path2.copy2to1.que

@@ -1,5 +1,5 @@
 "file1.txt"
 "file10.txt"
 "file3.txt"
-"file5.txt..path2"
+"file5.txt.conflict2"
 "file6.txt"

cmd/bisync/testdata/test_changes/golden/_testdir_path1.._testdir_path2.path1.lst

@@ -4,7 +4,7 @@
 -       19 - - 2001-01-02T00:00:00.000000000+0000 "file10.txt"
 -       19 - - 2001-01-02T00:00:00.000000000+0000 "file11.txt"
 -       13 - - 2001-01-02T00:00:00.000000000+0000 "file2.txt"
--       39 - - 2001-03-04T00:00:00.000000000+0000 "file5.txt..path1"
--       39 - - 2001-01-02T00:00:00.000000000+0000 "file5.txt..path2"
+-       39 - - 2001-03-04T00:00:00.000000000+0000 "file5.txt.conflict1"
+-       39 - - 2001-01-02T00:00:00.000000000+0000 "file5.txt.conflict2"
 -       19 - - 2001-01-02T00:00:00.000000000+0000 "file6.txt"
 -       19 - - 2001-01-02T00:00:00.000000000+0000 "file7.txt"

cmd/bisync/testdata/test_changes/golden/_testdir_path1.._testdir_path2.path2.lst

@@ -4,7 +4,7 @@
 -       19 - - 2001-01-02T00:00:00.000000000+0000 "file10.txt"
 -       19 - - 2001-01-02T00:00:00.000000000+0000 "file11.txt"
 -       13 - - 2001-01-02T00:00:00.000000000+0000 "file2.txt"
--       39 - - 2001-03-04T00:00:00.000000000+0000 "file5.txt..path1"
--       39 - - 2001-01-02T00:00:00.000000000+0000 "file5.txt..path2"
+-       39 - - 2001-03-04T00:00:00.000000000+0000 "file5.txt.conflict1"
+-       39 - - 2001-01-02T00:00:00.000000000+0000 "file5.txt.conflict2"
 -       19 - - 2001-01-02T00:00:00.000000000+0000 "file6.txt"
 -       19 - - 2001-01-02T00:00:00.000000000+0000 "file7.txt"

cmd/bisync/testdata/test_changes/golden/test.log

@@ -101,10 +101,10 @@ INFO  : - Path1    Queue copy to Path2       - {
 INFO  : - Path1    Queue copy to Path2       - {path2/}file2.txt
 INFO  : - Path2    Queue delete              - {path2/}file4.txt
 NOTICE: - WARNING  New or changed in both paths       - file5.txt
-NOTICE: - Path1    Renaming Path1 copy                - {path1/}file5.txt..path1
-NOTICE: - Path1    Queue copy to Path2       - {path2/}file5.txt..path1
-NOTICE: - Path2    Renaming Path2 copy                - {path2/}file5.txt..path2
-NOTICE: - Path2    Queue copy to Path1       - {path1/}file5.txt..path2
+NOTICE: - Path1    Renaming Path1 copy                - {path1/}file5.txt.conflict1
+NOTICE: - Path1    Queue copy to Path2       - {path2/}file5.txt.conflict1
+NOTICE: - Path2    Renaming Path2 copy                - {path2/}file5.txt.conflict2
+NOTICE: - Path2    Queue copy to Path1       - {path1/}file5.txt.conflict2
 INFO  : - Path2    Queue copy to Path1       - {path1/}file6.txt
 INFO  : - Path1    Queue copy to Path2       - {path2/}file7.txt
 INFO  : - Path2    Queue copy to Path1       - {path1/}file1.txt

cmd/bisync/testdata/test_compare_all/golden/_testdir_path1.._testdir_path2.copy1to2.que

@@ -1,5 +1,5 @@
 "file11.txt"
 "file2.txt"
 "file4.txt"
-"file5.txt..path1"
+"file5.txt.conflict1"
 "file7.txt"

cmd/bisync/testdata/test_compare_all/golden/_testdir_path1.._testdir_path2.copy2to1.que

@@ -1,5 +1,5 @@
 "file1.txt"
 "file10.txt"
 "file3.txt"
-"file5.txt..path2"
+"file5.txt.conflict2"
 "file6.txt"

cmd/bisync/testdata/test_compare_all/golden/_testdir_path1.._testdir_path2.path1.lst

@@ -4,7 +4,7 @@
 -       19 md5:7fe98ed88552b828777d8630900346b8 - 2001-01-02T00:00:00.000000000+0000 "file10.txt"
 -       19 md5:7fe98ed88552b828777d8630900346b8 - 2001-01-02T00:00:00.000000000+0000 "file11.txt"
 -       13 md5:fb3ecfb2800400fb01b0bfd39903e9fb - 2001-01-02T00:00:00.000000000+0000 "file2.txt"
--       39 md5:0860a03592626642f8fd6c8bfb447d2a - 2001-03-04T00:00:00.000000000+0000 "file5.txt..path1"
--       39 md5:979a803b15d27df0c31ad7d29006d10b - 2001-01-02T00:00:00.000000000+0000 "file5.txt..path2"
+-       39 md5:0860a03592626642f8fd6c8bfb447d2a - 2001-03-04T00:00:00.000000000+0000 "file5.txt.conflict1"
+-       39 md5:979a803b15d27df0c31ad7d29006d10b - 2001-01-02T00:00:00.000000000+0000 "file5.txt.conflict2"
 -       19 md5:7fe98ed88552b828777d8630900346b8 - 2001-01-02T00:00:00.000000000+0000 "file6.txt"
 -       19 md5:7fe98ed88552b828777d8630900346b8 - 2001-01-02T00:00:00.000000000+0000 "file7.txt"

cmd/bisync/testdata/test_compare_all/golden/_testdir_path1.._testdir_path2.path2.lst

@@ -4,7 +4,7 @@
 -       19 md5:7fe98ed88552b828777d8630900346b8 - 2001-01-02T00:00:00.000000000+0000 "file10.txt"
 -       19 md5:7fe98ed88552b828777d8630900346b8 - 2001-01-02T00:00:00.000000000+0000 "file11.txt"
 -       13 md5:fb3ecfb2800400fb01b0bfd39903e9fb - 2001-01-02T00:00:00.000000000+0000 "file2.txt"
--       39 md5:0860a03592626642f8fd6c8bfb447d2a - 2001-03-04T00:00:00.000000000+0000 "file5.txt..path1"
--       39 md5:979a803b15d27df0c31ad7d29006d10b - 2001-01-02T00:00:00.000000000+0000 "file5.txt..path2"
+-       39 md5:0860a03592626642f8fd6c8bfb447d2a - 2001-03-04T00:00:00.000000000+0000 "file5.txt.conflict1"
+-       39 md5:979a803b15d27df0c31ad7d29006d10b - 2001-01-02T00:00:00.000000000+0000 "file5.txt.conflict2"
 -       19 md5:7fe98ed88552b828777d8630900346b8 - 2001-01-02T00:00:00.000000000+0000 "file6.txt"
 -       19 md5:7fe98ed88552b828777d8630900346b8 - 2001-01-02T00:00:00.000000000+0000 "file7.txt"

cmd/bisync/testdata/test_compare_all/golden/test.log

@@ -94,10 +94,10 @@ INFO  : - Path1    Queue copy to Path2       - {
 INFO  : - Path1    Queue copy to Path2       - {path2/}file2.txt
 INFO  : - Path2    Queue delete              - {path2/}file4.txt
 NOTICE: - WARNING  New or changed in both paths       - file5.txt
-NOTICE: - Path1    Renaming Path1 copy                - {path1/}file5.txt..path1
-NOTICE: - Path1    Queue copy to Path2       - {path2/}file5.txt..path1
-NOTICE: - Path2    Renaming Path2 copy                - {path2/}file5.txt..path2
-NOTICE: - Path2    Queue copy to Path1       - {path1/}file5.txt..path2
+NOTICE: - Path1    Renaming Path1 copy                - {path1/}file5.txt.conflict1
+NOTICE: - Path1    Queue copy to Path2       - {path2/}file5.txt.conflict1
+NOTICE: - Path2    Renaming Path2 copy                - {path2/}file5.txt.conflict2
+NOTICE: - Path2    Queue copy to Path1       - {path1/}file5.txt.conflict2
 INFO  : - Path2    Queue copy to Path1       - {path1/}file6.txt
 INFO  : - Path1    Queue copy to Path2       - {path2/}file7.txt
 INFO  : - Path2    Queue copy to Path1       - {path1/}file1.txt

cmd/bisync/testdata/test_dry_run/golden/_testdir_path1.._testdir_path2.copy1to2.que

@@ -1,5 +1,5 @@
 "file11.txt"
 "file2.txt"
 "file4.txt"
-"file5.txt..path1"
+"file5.txt.conflict1"
 "file7.txt"

cmd/bisync/testdata/test_dry_run/golden/_testdir_path1.._testdir_path2.copy2to1.que

@@ -1,5 +1,5 @@
 "file1.txt"
 "file10.txt"
 "file3.txt"
-"file5.txt..path2"
+"file5.txt.conflict2"
 "file6.txt"

cmd/bisync/testdata/test_dry_run/golden/_testdir_path1.._testdir_path2.path1.lst

@@ -4,7 +4,7 @@
 -       19 - - 2001-01-02T00:00:00.000000000+0000 "file10.txt"
 -       19 - - 2001-01-02T00:00:00.000000000+0000 "file11.txt"
 -       13 - - 2001-01-02T00:00:00.000000000+0000 "file2.txt"
--       39 - - 2001-03-04T00:00:00.000000000+0000 "file5.txt..path1"
--       39 - - 2001-01-02T00:00:00.000000000+0000 "file5.txt..path2"
+-       39 - - 2001-03-04T00:00:00.000000000+0000 "file5.txt.conflict1"
+-       39 - - 2001-01-02T00:00:00.000000000+0000 "file5.txt.conflict2"
 -       19 - - 2001-01-02T00:00:00.000000000+0000 "file6.txt"
 -       19 - - 2001-01-02T00:00:00.000000000+0000 "file7.txt"

cmd/bisync/testdata/test_dry_run/golden/_testdir_path1.._testdir_path2.path2.lst

@@ -4,7 +4,7 @@
 -       19 - - 2001-01-02T00:00:00.000000000+0000 "file10.txt"
 -       19 - - 2001-01-02T00:00:00.000000000+0000 "file11.txt"
 -       13 - - 2001-01-02T00:00:00.000000000+0000 "file2.txt"
--       39 - - 2001-03-04T00:00:00.000000000+0000 "file5.txt..path1"
--       39 - - 2001-01-02T00:00:00.000000000+0000 "file5.txt..path2"
+-       39 - - 2001-03-04T00:00:00.000000000+0000 "file5.txt.conflict1"
+-       39 - - 2001-01-02T00:00:00.000000000+0000 "file5.txt.conflict2"
 -       19 - - 2001-01-02T00:00:00.000000000+0000 "file6.txt"
 -       19 - - 2001-01-02T00:00:00.000000000+0000 "file7.txt"

cmd/bisync/testdata/test_dry_run/golden/dryrun._testdir_path1.._testdir_path2.copy1to2.que

@@ -1,5 +1,5 @@
 "file11.txt"
 "file2.txt"
 "file4.txt"
-"file5.txt..path1"
+"file5.txt.conflict1"
 "file7.txt"

cmd/bisync/testdata/test_dry_run/golden/dryrun._testdir_path1.._testdir_path2.copy2to1.que

@@ -1,5 +1,5 @@
 "file1.txt"
 "file10.txt"
 "file3.txt"
-"file5.txt..path2"
+"file5.txt.conflict2"
 "file6.txt"

cmd/bisync/testdata/test_dry_run/golden/test.log

@@ -123,12 +123,10 @@ INFO  : - Path1    Queue copy to Path2       - {
 INFO  : - Path1    Queue copy to Path2       - {path2/}file2.txt
 INFO  : - Path2    Queue delete              - {path2/}file4.txt
 NOTICE: - WARNING  New or changed in both paths       - file5.txt
-NOTICE: - Path1    Renaming Path1 copy                - {path1/}file5.txt..path1
-NOTICE: file5.txt: Skipped move as --dry-run is set (size 39)
-NOTICE: - Path1    Queue copy to Path2       - {path2/}file5.txt..path1
-NOTICE: - Path2    Renaming Path2 copy                - {path2/}file5.txt..path2
-NOTICE: file5.txt: Skipped move as --dry-run is set (size 39)
-NOTICE: - Path2    Queue copy to Path1       - {path1/}file5.txt..path2
+NOTICE: file5.txt: Skipped rename as --dry-run is set
+NOTICE: - Path1    Queue copy to Path2       - {path2/}file5.txt.conflict1
+NOTICE: file5.txt: Skipped rename as --dry-run is set
+NOTICE: - Path2    Queue copy to Path1       - {path1/}file5.txt.conflict2
 INFO  : - Path2    Queue copy to Path1       - {path1/}file6.txt
 INFO  : - Path1    Queue copy to Path2       - {path2/}file7.txt
 INFO  : - Path2    Queue copy to Path1       - {path1/}file1.txt
@@ -190,10 +188,10 @@ INFO  : - Path1    Queue copy to Path2       - {
 INFO  : - Path1    Queue copy to Path2       - {path2/}file2.txt
 INFO  : - Path2    Queue delete              - {path2/}file4.txt
 NOTICE: - WARNING  New or changed in both paths       - file5.txt
-NOTICE: - Path1    Renaming Path1 copy                - {path1/}file5.txt..path1
-NOTICE: - Path1    Queue copy to Path2       - {path2/}file5.txt..path1
-NOTICE: - Path2    Renaming Path2 copy                - {path2/}file5.txt..path2
-NOTICE: - Path2    Queue copy to Path1       - {path1/}file5.txt..path2
+NOTICE: - Path1    Renaming Path1 copy                - {path1/}file5.txt.conflict1
+NOTICE: - Path1    Queue copy to Path2       - {path2/}file5.txt.conflict1
+NOTICE: - Path2    Renaming Path2 copy                - {path2/}file5.txt.conflict2
+NOTICE: - Path2    Queue copy to Path1       - {path1/}file5.txt.conflict2
 INFO  : - Path2    Queue copy to Path1       - {path1/}file6.txt
 INFO  : - Path1    Queue copy to Path2       - {path2/}file7.txt
 INFO  : - Path2    Queue copy to Path1       - {path1/}file1.txt

cmd/bisync/testdata/test_equal/golden/_testdir_path1.._testdir_path2.copy1to2.que

@@ -1 +1 @@
-"file1.txt..path1"
+"file1.txt.conflict1"

cmd/bisync/testdata/test_equal/golden/_testdir_path1.._testdir_path2.copy2to1.que

@@ -1 +1 @@
-"file1.txt..path2"
+"file1.txt.conflict2"

cmd/bisync/testdata/test_equal/golden/_testdir_path1.._testdir_path2.path1.lst

@@ -1,5 +1,5 @@
 # bisync listing v1 from test
 -      109 - - 2000-01-01T00:00:00.000000000+0000 "RCLONE_TEST"
--       33 - - 2001-03-04T00:00:00.000000000+0000 "file1.txt..path1"
--       33 - - 2001-01-02T00:00:00.000000000+0000 "file1.txt..path2"
+-       33 - - 2001-03-04T00:00:00.000000000+0000 "file1.txt.conflict1"
+-       33 - - 2001-01-02T00:00:00.000000000+0000 "file1.txt.conflict2"
 -       37 - - 2001-01-02T00:00:00.000000000+0000 "file2.txt"

cmd/bisync/testdata/test_equal/golden/_testdir_path1.._testdir_path2.path2.lst

@@ -1,5 +1,5 @@
 # bisync listing v1 from test
 -      109 - - 2000-01-01T00:00:00.000000000+0000 "RCLONE_TEST"
--       33 - - 2001-03-04T00:00:00.000000000+0000 "file1.txt..path1"
--       33 - - 2001-01-02T00:00:00.000000000+0000 "file1.txt..path2"
+-       33 - - 2001-03-04T00:00:00.000000000+0000 "file1.txt.conflict1"
+-       33 - - 2001-01-02T00:00:00.000000000+0000 "file1.txt.conflict2"
 -       37 - - 2001-01-02T00:00:00.000000000+0000 "file2.txt"

cmd/bisync/testdata/test_equal/golden/test.log

@@ -63,10 +63,10 @@ NOTICE: {path2String}: 1 errors while checking
 NOTICE: {path2String}: 1 matching files
 INFO  : Finished checking the potential conflicts. 1 differences found
 NOTICE: - WARNING  New or changed in both paths       - file1.txt
-NOTICE: - Path1    Renaming Path1 copy                - {path1/}file1.txt..path1
-NOTICE: - Path1    Queue copy to Path2       - {path2/}file1.txt..path1
-NOTICE: - Path2    Renaming Path2 copy                - {path2/}file1.txt..path2
-NOTICE: - Path2    Queue copy to Path1       - {path1/}file1.txt..path2
+NOTICE: - Path1    Renaming Path1 copy                - {path1/}file1.txt.conflict1
+NOTICE: - Path1    Queue copy to Path2       - {path2/}file1.txt.conflict1
+NOTICE: - Path2    Renaming Path2 copy                - {path2/}file1.txt.conflict2
+NOTICE: - Path2    Queue copy to Path1       - {path1/}file1.txt.conflict2
 NOTICE: - WARNING  New or changed in both paths       - file2.txt
 INFO  : Files are equal! Skipping: file2.txt
 INFO  : - Path2    Do queued copies to                - Path1

cmd/bisync/testdata/test_extended_filenames/golden/_testdir_path1.._testdir_path2.copy1to2.que

@@ -1,6 +1,6 @@
 "file1_with white space.txt"
 "filename_contains_ࢺ_p1m.txt"
 "subdir_with_ࢺ_/file_with_測試_.txt"
-"subdir_with_ࢺ_/filechangedbothpaths_ࢺ_.txt..path1"
+"subdir_with_ࢺ_/filechangedbothpaths_ࢺ_.txt.conflict1"
 "subdir_with_ࢺ_/mañana_funcionará.txt"
 "subdir_with_ࢺ_/test.txt"

cmd/bisync/testdata/test_extended_filenames/golden/_testdir_path1.._testdir_path2.copy2to1.que

@@ -3,7 +3,7 @@
 "filename_contains_ࢺ_.txt"
 "subdir with␊white space.txt/file2 with␊white space.txt"
 "subdir_rawchars_␙_\x81_\xfe/file3_␙_\x81_\xfe"
-"subdir_with_ࢺ_/filechangedbothpaths_ࢺ_.txt..path2"
+"subdir_with_ࢺ_/filechangedbothpaths_ࢺ_.txt.conflict2"
 "subdir_with_ࢺ_/filename_contains_ě_.txt"
 "subdir_with_ࢺ_/filename_contains_ࢺ_p2s.txt"
 "Русский.txt"

cmd/bisync/testdata/test_extended_filenames/golden/_testdir_path1.._testdir_path2.path1.lst

@@ -11,8 +11,8 @@
 -       19 - - 2001-01-02T00:00:00.000000000+0000 "subdir with␊white space.txt/file2 with␊white space.txt"
 -       19 - - 2001-01-02T00:00:00.000000000+0000 "subdir_rawchars_␙_\x81_\xfe/file3_␙_\x81_\xfe"
 -       19 - - 2001-01-02T00:00:00.000000000+0000 "subdir_with_ࢺ_/file_with_測試_.txt"
--       19 - - 2001-01-03T00:00:00.000000000+0000 "subdir_with_ࢺ_/filechangedbothpaths_ࢺ_.txt..path1"
--       42 - - 2001-01-02T00:00:00.000000000+0000 "subdir_with_ࢺ_/filechangedbothpaths_ࢺ_.txt..path2"
+-       19 - - 2001-01-03T00:00:00.000000000+0000 "subdir_with_ࢺ_/filechangedbothpaths_ࢺ_.txt.conflict1"
+-       42 - - 2001-01-02T00:00:00.000000000+0000 "subdir_with_ࢺ_/filechangedbothpaths_ࢺ_.txt.conflict2"
 -      272 - - 2000-01-01T00:00:00.000000000+0000 "subdir_with_ࢺ_/filename_contains_ࢺ_.txt"
 -       19 - - 2001-01-02T00:00:00.000000000+0000 "subdir_with_ࢺ_/filename_contains_ࢺ_p2s.txt"
 -       19 - - 2001-01-02T00:00:00.000000000+0000 "subdir_with_ࢺ_/mañana_funcionará.txt"

cmd/bisync/testdata/test_extended_filenames/golden/_testdir_path1.._testdir_path2.path2.lst

@@ -11,8 +11,8 @@
 -       19 - - 2001-01-02T00:00:00.000000000+0000 "subdir with␊white space.txt/file2 with␊white space.txt"
 -       19 - - 2001-01-02T00:00:00.000000000+0000 "subdir_rawchars_␙_\x81_\xfe/file3_␙_\x81_\xfe"
 -       19 - - 2001-01-02T00:00:00.000000000+0000 "subdir_with_ࢺ_/file_with_測試_.txt"
--       19 - - 2001-01-03T00:00:00.000000000+0000 "subdir_with_ࢺ_/filechangedbothpaths_ࢺ_.txt..path1"
--       42 - - 2001-01-02T00:00:00.000000000+0000 "subdir_with_ࢺ_/filechangedbothpaths_ࢺ_.txt..path2"
+-       19 - - 2001-01-03T00:00:00.000000000+0000 "subdir_with_ࢺ_/filechangedbothpaths_ࢺ_.txt.conflict1"
+-       42 - - 2001-01-02T00:00:00.000000000+0000 "subdir_with_ࢺ_/filechangedbothpaths_ࢺ_.txt.conflict2"
 -      272 - - 2000-01-01T00:00:00.000000000+0000 "subdir_with_ࢺ_/filename_contains_ࢺ_.txt"
 -       19 - - 2001-01-02T00:00:00.000000000+0000 "subdir_with_ࢺ_/filename_contains_ࢺ_p2s.txt"
 -       19 - - 2001-01-02T00:00:00.000000000+0000 "subdir_with_ࢺ_/mañana_funcionará.txt"

cmd/bisync/testdata/test_extended_filenames/golden/test.log

@@ -96,10 +96,10 @@ INFO  : - Path1    Queue copy to Path2       - {
 INFO  : - Path1    Queue copy to Path2       - {path2/}filename_contains_ࢺ_p1m.txt
 INFO  : - Path1    Queue copy to Path2       - {path2/}subdir_with_ࢺ_/file_with_測試_.txt
 NOTICE: - WARNING  New or changed in both paths       - subdir_with_ࢺ_/filechangedbothpaths_ࢺ_.txt
-NOTICE: - Path1    Renaming Path1 copy                - {path1/}subdir_with_ࢺ_/filechangedbothpaths_ࢺ_.txt..path1
-NOTICE: - Path1    Queue copy to Path2       - {path2/}subdir_with_ࢺ_/filechangedbothpaths_ࢺ_.txt..path1
-NOTICE: - Path2    Renaming Path2 copy                - {path2/}subdir_with_ࢺ_/filechangedbothpaths_ࢺ_.txt..path2
-NOTICE: - Path2    Queue copy to Path1       - {path1/}subdir_with_ࢺ_/filechangedbothpaths_ࢺ_.txt..path2
+NOTICE: - Path1    Renaming Path1 copy                - {path1/}subdir_with_ࢺ_/filechangedbothpaths_ࢺ_.txt.conflict1
+NOTICE: - Path1    Queue copy to Path2       - {path2/}subdir_with_ࢺ_/filechangedbothpaths_ࢺ_.txt.conflict1
+NOTICE: - Path2    Renaming Path2 copy                - {path2/}subdir_with_ࢺ_/filechangedbothpaths_ࢺ_.txt.conflict2
+NOTICE: - Path2    Queue copy to Path1       - {path1/}subdir_with_ࢺ_/filechangedbothpaths_ࢺ_.txt.conflict2
 INFO  : - Path1    Queue copy to Path2       - {path2/}subdir_with_ࢺ_/mañana_funcionará.txt
 INFO  : - Path1    Queue copy to Path2       - {path2/}subdir_with_ࢺ_/test.txt
 INFO  : - Path2    Queue copy to Path1       - {path1/}Русский.txt

cmd/bisync/testdata/test_resolve/golden/_testdir_path1.._testdir_path2.copy1to2.que

@@ -0,0 +1 @@
+"file1.txt"

cmd/bisync/testdata/test_resolve/golden/_testdir_path1.._testdir_path2.copy2to1.que

@@ -0,0 +1 @@
+"file2.txt"

cmd/bisync/testdata/test_resolve/golden/_testdir_path1.._testdir_path2.path1.lst

@@ -0,0 +1,10 @@
+# bisync listing v1 from test
+-      109 - - 2000-01-01T00:00:00.000000000+0000 "RCLONE_TEST"
+-       33 - - 2006-03-04T00:00:00.000000000+0000 "file1.txt"
+-       33 - - 2004-07-23T00:00:00.000000000+0000 "file1.txt..path1"
+-       33 - - 2004-07-23T00:00:00.000000000+0000 "file1.txt..path2"
+-       33 - - 2002-08-26T00:00:00.000000000+0000 "file1.txt.apple1"
+-       33 - - 2002-07-23T00:00:00.000000000+0000 "file1.txt.apple2"
+-       33 - - 2003-07-23T00:00:00.000000000+0000 "file1.txt.cloud1"
+-       33 - - 2001-08-26T00:00:00.000000000+0000 "file1.txt.dinosaur1"
+-       33 - - 2003-07-23T00:00:00.000000000+0000 "file1.txt.local1"

cmd/bisync/testdata/test_resolve/golden/_testdir_path1.._testdir_path2.path1.lst-new

@@ -0,0 +1,11 @@
+# bisync listing v1 from test
+-      109 - - 2000-01-01T00:00:00.000000000+0000 "RCLONE_TEST"
+-       33 - - 2006-03-04T00:00:00.000000000+0000 "file1.txt"
+-       33 - - 2004-07-23T00:00:00.000000000+0000 "file1.txt..path1"
+-       33 - - 2004-07-23T00:00:00.000000000+0000 "file1.txt..path2"
+-       33 - - 2002-08-26T00:00:00.000000000+0000 "file1.txt.apple1"
+-       33 - - 2002-07-23T00:00:00.000000000+0000 "file1.txt.apple2"
+-       33 - - 2003-07-23T00:00:00.000000000+0000 "file1.txt.cloud1"
+-       33 - - 2001-08-26T00:00:00.000000000+0000 "file1.txt.dinosaur1"
+-       33 - - 2003-07-23T00:00:00.000000000+0000 "file1.txt.local1"
+-       33 - - 2005-01-02T00:00:00.000000000+0000 "file2.txt"

cmd/bisync/testdata/test_resolve/golden/_testdir_path1.._testdir_path2.path1.lst-old

@@ -0,0 +1,10 @@
+# bisync listing v1 from test
+-      109 - - 2000-01-01T00:00:00.000000000+0000 "RCLONE_TEST"
+-       33 - - 2004-07-23T00:00:00.000000000+0000 "file1.txt..path1"
+-       33 - - 2004-07-23T00:00:00.000000000+0000 "file1.txt..path2"
+-       33 - - 2002-08-26T00:00:00.000000000+0000 "file1.txt.apple1"
+-       33 - - 2002-07-23T00:00:00.000000000+0000 "file1.txt.apple2"
+-       33 - - 2003-07-23T00:00:00.000000000+0000 "file1.txt.cloud1"
+-       33 - - 2001-08-26T00:00:00.000000000+0000 "file1.txt.dinosaur1"
+-       33 - - 2003-07-23T00:00:00.000000000+0000 "file1.txt.local1"
+-        0 - - 2000-01-01T00:00:00.000000000+0000 "file2.txt"

cmd/bisync/testdata/test_resolve/golden/_testdir_path1.._testdir_path2.path2.lst

@@ -0,0 +1,10 @@
+# bisync listing v1 from test
+-      109 - - 2000-01-01T00:00:00.000000000+0000 "RCLONE_TEST"
+-       33 - - 2006-03-04T00:00:00.000000000+0000 "file1.txt"
+-       33 - - 2004-07-23T00:00:00.000000000+0000 "file1.txt..path1"
+-       33 - - 2004-07-23T00:00:00.000000000+0000 "file1.txt..path2"
+-       33 - - 2002-08-26T00:00:00.000000000+0000 "file1.txt.apple1"
+-       33 - - 2002-07-23T00:00:00.000000000+0000 "file1.txt.apple2"
+-       33 - - 2003-07-23T00:00:00.000000000+0000 "file1.txt.cloud1"
+-       33 - - 2001-08-26T00:00:00.000000000+0000 "file1.txt.dinosaur1"
+-       33 - - 2003-07-23T00:00:00.000000000+0000 "file1.txt.local1"

cmd/bisync/testdata/test_resolve/golden/_testdir_path1.._testdir_path2.path2.lst-new

@@ -0,0 +1,11 @@
+# bisync listing v1 from test
+-      109 - - 2000-01-01T00:00:00.000000000+0000 "RCLONE_TEST"
+-       33 - - 2005-01-02T00:00:00.000000000+0000 "file1.txt"
+-       33 - - 2004-07-23T00:00:00.000000000+0000 "file1.txt..path1"
+-       33 - - 2004-07-23T00:00:00.000000000+0000 "file1.txt..path2"
+-       33 - - 2002-08-26T00:00:00.000000000+0000 "file1.txt.apple1"
+-       33 - - 2002-07-23T00:00:00.000000000+0000 "file1.txt.apple2"
+-       33 - - 2003-07-23T00:00:00.000000000+0000 "file1.txt.cloud1"
+-       33 - - 2001-08-26T00:00:00.000000000+0000 "file1.txt.dinosaur1"
+-       33 - - 2003-07-23T00:00:00.000000000+0000 "file1.txt.local1"
+-       33 - - 2006-03-04T00:00:00.000000000+0000 "file2.txt"

cmd/bisync/testdata/test_resolve/golden/_testdir_path1.._testdir_path2.path2.lst-old

@@ -0,0 +1,10 @@
+# bisync listing v1 from test
+-      109 - - 2000-01-01T00:00:00.000000000+0000 "RCLONE_TEST"
+-       33 - - 2004-07-23T00:00:00.000000000+0000 "file1.txt..path1"
+-       33 - - 2004-07-23T00:00:00.000000000+0000 "file1.txt..path2"
+-       33 - - 2002-08-26T00:00:00.000000000+0000 "file1.txt.apple1"
+-       33 - - 2002-07-23T00:00:00.000000000+0000 "file1.txt.apple2"
+-       33 - - 2003-07-23T00:00:00.000000000+0000 "file1.txt.cloud1"
+-       33 - - 2001-08-26T00:00:00.000000000+0000 "file1.txt.dinosaur1"
+-       33 - - 2003-07-23T00:00:00.000000000+0000 "file1.txt.local1"
+-        0 - - 2000-01-01T00:00:00.000000000+0000 "file2.txt"

cmd/bisync/testdata/test_resolve/golden/test.log

@@ -0,0 +1,304 @@
+(01)  : test resolve
+
+
+(02)  : test initial bisync
+(03)  : bisync resync
+INFO  : Setting --ignore-listing-checksum as neither --checksum nor --compare checksum are set.
+INFO  : Bisyncing with Comparison Settings:
+{
+"Modtime": true,
+"Size": true,
+"Checksum": false,
+"NoSlowHash": false,
+"SlowHashSyncOnly": false,
+"DownloadHash": false
+}
+INFO  : Synching Path1 "{path1/}" with Path2 "{path2/}"
+INFO  : Copying unique Path2 files to Path1
+INFO  : - Path2    Resync is copying UNIQUE files to  - Path1
+INFO  : - Path1    Resync is copying UNIQUE OR DIFFERING files to - Path2
+INFO  : Resync updating listings
+INFO  : Bisync successful
+
+(04)  : test changed on both paths and NOT identical - file1 (file1R, file1L)
+(05)  : touch-glob 2001-01-02 {datadir/} file1R.txt
+(06)  : copy-as {datadir/}file1R.txt {path2/} file1.txt
+(07)  : touch-glob 2001-03-04 {datadir/} file1L.txt
+(08)  : copy-as {datadir/}file1L.txt {path1/} file1.txt
+
+(09)  : test bisync run with --conflict-resolve=newer --conflict-loser=delete --conflict-suffix=potato
+
+(10)  : bisync conflict-resolve=newer conflict-loser=delete conflict-suffix=potato
+INFO  : Setting --ignore-listing-checksum as neither --checksum nor --compare checksum are set.
+INFO  : Bisyncing with Comparison Settings:
+{
+"Modtime": true,
+"Size": true,
+"Checksum": false,
+"NoSlowHash": false,
+"SlowHashSyncOnly": false,
+"DownloadHash": false
+}
+INFO  : Synching Path1 "{path1/}" with Path2 "{path2/}"
+INFO  : Building Path1 and Path2 listings
+INFO  : Path1 checking for diffs
+INFO  : - Path1    File changed: size (larger), time (newer) - file1.txt
+INFO  : Path1:    1 changes:    0 new,    1 modified,    0 deleted
+INFO  : (Modified:    1 newer,    0 older,    1 larger,    0 smaller)
+INFO  : Path2 checking for diffs
+INFO  : - Path2    File changed: size (larger), time (newer) - file1.txt
+INFO  : Path2:    1 changes:    0 new,    1 modified,    0 deleted
+INFO  : (Modified:    1 newer,    0 older,    1 larger,    0 smaller)
+INFO  : Applying changes
+INFO  : Checking potential conflicts...
+ERROR : file1.txt: md5 differ
+NOTICE: {path2String}: 1 differences found
+NOTICE: {path2String}: 1 errors while checking
+INFO  : Finished checking the potential conflicts. 1 differences found
+NOTICE: - WARNING  New or changed in both paths       - file1.txt
+INFO  : file1.txt: Path1 is newer. Path1: 2001-03-04 00:00:00 +0000 UTC, Path2: 2001-01-02 00:00:00 +0000 UTC, Difference: 1464h0m0s
+INFO  : file1.txt: The winner is: Path1
+NOTICE: - Path2    Deleting Path2 copy                - {path2/}file1.txt
+INFO  : - Path1    Queue copy to Path2       - file1.txt
+INFO  : - Path1    Do queued copies to                - Path2
+INFO  : Updating listings
+INFO  : Validating listings for Path1 "{path1/}" vs Path2 "{path2/}"
+INFO  : Bisync successful
+
+(11)  : test changed on both paths and NOT identical - file1 (file1R, file1L)
+(12)  : touch-glob 2001-07-23 {datadir/} file1R.txt
+(13)  : copy-as {datadir/}file1R.txt {path2/} file1.txt
+(14)  : touch-glob 2001-08-26 {datadir/} file1L.txt
+(15)  : copy-as {datadir/}file1L.txt {path1/} file1.txt
+
+(16)  : test bisync run with --conflict-resolve=path2 --conflict-loser=num --conflict-suffix=dinosaur
+
+(17)  : bisync conflict-resolve=path2 conflict-loser=num conflict-suffix=dinosaur
+INFO  : Setting --ignore-listing-checksum as neither --checksum nor --compare checksum are set.
+INFO  : Bisyncing with Comparison Settings:
+{
+"Modtime": true,
+"Size": true,
+"Checksum": false,
+"NoSlowHash": false,
+"SlowHashSyncOnly": false,
+"DownloadHash": false
+}
+INFO  : Synching Path1 "{path1/}" with Path2 "{path2/}"
+INFO  : Building Path1 and Path2 listings
+INFO  : Path1 checking for diffs
+INFO  : - Path1    File changed: time (newer) - file1.txt
+INFO  : Path1:    1 changes:    0 new,    1 modified,    0 deleted
+INFO  : (Modified:    1 newer,    0 older)
+INFO  : Path2 checking for diffs
+INFO  : - Path2    File changed: time (newer) - file1.txt
+INFO  : Path2:    1 changes:    0 new,    1 modified,    0 deleted
+INFO  : (Modified:    1 newer,    0 older)
+INFO  : Applying changes
+INFO  : Checking potential conflicts...
+ERROR : file1.txt: md5 differ
+NOTICE: {path2String}: 1 differences found
+NOTICE: {path2String}: 1 errors while checking
+INFO  : Finished checking the potential conflicts. 1 differences found
+NOTICE: - WARNING  New or changed in both paths       - file1.txt
+INFO  : file1.txt: The winner is: Path2
+NOTICE: - Path1    Renaming Path1 copy                - {path1/}file1.txt.dinosaur1
+NOTICE: - Path1    Queue copy to Path2       - {path2/}file1.txt.dinosaur1
+NOTICE: - Path2    Not renaming Path2 copy, as it was determined the winner - {path2/}file1.txt
+NOTICE: - Path2    Queue copy to Path1       - {path1/}file1.txt
+INFO  : - Path2    Do queued copies to                - Path1
+INFO  : - Path1    Do queued copies to                - Path2
+INFO  : Updating listings
+INFO  : Validating listings for Path1 "{path1/}" vs Path2 "{path2/}"
+INFO  : Bisync successful
+
+(18)  : test changed on both paths and NOT identical - file1 (file1R, file1L)
+(19)  : touch-glob 2002-07-23 {datadir/} file1R.txt
+(20)  : copy-as {datadir/}file1R.txt {path2/} file1.txt
+(21)  : touch-glob 2002-08-26 {datadir/} file1L.txt
+(22)  : copy-as {datadir/}file1L.txt {path1/} file1.txt
+
+(23)  : test bisync run with --conflict-resolve=larger --conflict-loser=num --conflict-suffix=apple
+
+(24)  : bisync conflict-resolve=larger conflict-loser=num conflict-suffix=apple
+INFO  : Setting --ignore-listing-checksum as neither --checksum nor --compare checksum are set.
+INFO  : Bisyncing with Comparison Settings:
+{
+"Modtime": true,
+"Size": true,
+"Checksum": false,
+"NoSlowHash": false,
+"SlowHashSyncOnly": false,
+"DownloadHash": false
+}
+INFO  : Synching Path1 "{path1/}" with Path2 "{path2/}"
+INFO  : Building Path1 and Path2 listings
+INFO  : Path1 checking for diffs
+INFO  : - Path1    File is new               - file1.txt
+INFO  : Path1:    1 changes:    1 new,    0 modified,    0 deleted
+INFO  : Path2 checking for diffs
+INFO  : - Path2    File is new               - file1.txt
+INFO  : Path2:    1 changes:    1 new,    0 modified,    0 deleted
+INFO  : Applying changes
+INFO  : Checking potential conflicts...
+ERROR : file1.txt: md5 differ
+NOTICE: {path2String}: 1 differences found
+NOTICE: {path2String}: 1 errors while checking
+INFO  : Finished checking the potential conflicts. 1 differences found
+NOTICE: - WARNING  New or changed in both paths       - file1.txt
+INFO  : file1.txt: Winner cannot be determined as sizes are equal. Path1: 33, Path2: 33, Difference: 0
+INFO  : file1.txt: A winner could not be determined.
+NOTICE: - Path1    Renaming Path1 copy                - {path1/}file1.txt.apple1
+NOTICE: - Path1    Queue copy to Path2       - {path2/}file1.txt.apple1
+NOTICE: - Path2    Renaming Path2 copy                - {path2/}file1.txt.apple2
+NOTICE: - Path2    Queue copy to Path1       - {path1/}file1.txt.apple2
+INFO  : - Path2    Do queued copies to                - Path1
+INFO  : - Path1    Do queued copies to                - Path2
+INFO  : Updating listings
+INFO  : Validating listings for Path1 "{path1/}" vs Path2 "{path2/}"
+INFO  : Bisync successful
+
+(25)  : test different suffixes
+(26)  : touch-glob 2003-07-23 {datadir/} file1R.txt
+(27)  : copy-as {datadir/}file1R.txt {path2/} file1.txt
+(28)  : touch-glob 2003-07-23 {datadir/} file1L.txt
+(29)  : copy-as {datadir/}file1L.txt {path1/} file1.txt
+
+(30)  : test bisync run with --conflict-resolve=older --conflict-loser=num --conflict-suffix=cloud,local
+
+(31)  : bisync conflict-resolve=older conflict-loser=num conflict-suffix=cloud,local
+INFO  : Setting --ignore-listing-checksum as neither --checksum nor --compare checksum are set.
+INFO  : Bisyncing with Comparison Settings:
+{
+"Modtime": true,
+"Size": true,
+"Checksum": false,
+"NoSlowHash": false,
+"SlowHashSyncOnly": false,
+"DownloadHash": false
+}
+INFO  : Synching Path1 "{path1/}" with Path2 "{path2/}"
+INFO  : Building Path1 and Path2 listings
+INFO  : Path1 checking for diffs
+INFO  : - Path1    File is new               - file1.txt
+INFO  : Path1:    1 changes:    1 new,    0 modified,    0 deleted
+INFO  : Path2 checking for diffs
+INFO  : - Path2    File is new               - file1.txt
+INFO  : Path2:    1 changes:    1 new,    0 modified,    0 deleted
+INFO  : Applying changes
+INFO  : Checking potential conflicts...
+ERROR : file1.txt: md5 differ
+NOTICE: {path2String}: 1 differences found
+NOTICE: {path2String}: 1 errors while checking
+INFO  : Finished checking the potential conflicts. 1 differences found
+NOTICE: - WARNING  New or changed in both paths       - file1.txt
+INFO  : file1.txt: Winner cannot be determined as times are equal. Path1: 2003-07-23 00:00:00 +0000 UTC, Path2: 2003-07-23 00:00:00 +0000 UTC, Difference: 0s
+INFO  : file1.txt: A winner could not be determined.
+NOTICE: - Path1    Renaming Path1 copy                - {path1/}file1.txt.cloud1
+NOTICE: - Path1    Queue copy to Path2       - {path2/}file1.txt.cloud1
+NOTICE: - Path2    Renaming Path2 copy                - {path2/}file1.txt.local1
+NOTICE: - Path2    Queue copy to Path1       - {path1/}file1.txt.local1
+INFO  : - Path2    Do queued copies to                - Path1
+INFO  : - Path1    Do queued copies to                - Path2
+INFO  : Updating listings
+INFO  : Validating listings for Path1 "{path1/}" vs Path2 "{path2/}"
+INFO  : Bisync successful
+
+(32)  : test legacy
+(33)  : touch-glob 2004-07-23 {datadir/} file1R.txt
+(34)  : copy-as {datadir/}file1R.txt {path2/} file1.txt
+(35)  : touch-glob 2004-07-23 {datadir/} file1L.txt
+(36)  : copy-as {datadir/}file1L.txt {path1/} file1.txt
+
+(37)  : test bisync run with --conflict-resolve=none --conflict-loser=pathname --conflict-suffix=.path
+
+(38)  : bisync conflict-resolve=none conflict-loser=pathname conflict-suffix=.path
+INFO  : Setting --ignore-listing-checksum as neither --checksum nor --compare checksum are set.
+INFO  : Bisyncing with Comparison Settings:
+{
+"Modtime": true,
+"Size": true,
+"Checksum": false,
+"NoSlowHash": false,
+"SlowHashSyncOnly": false,
+"DownloadHash": false
+}
+INFO  : Synching Path1 "{path1/}" with Path2 "{path2/}"
+INFO  : Building Path1 and Path2 listings
+INFO  : Path1 checking for diffs
+INFO  : - Path1    File is new               - file1.txt
+INFO  : Path1:    1 changes:    1 new,    0 modified,    0 deleted
+INFO  : Path2 checking for diffs
+INFO  : - Path2    File is new               - file1.txt
+INFO  : Path2:    1 changes:    1 new,    0 modified,    0 deleted
+INFO  : Applying changes
+INFO  : Checking potential conflicts...
+ERROR : file1.txt: md5 differ
+NOTICE: {path2String}: 1 differences found
+NOTICE: {path2String}: 1 errors while checking
+INFO  : Finished checking the potential conflicts. 1 differences found
+NOTICE: - WARNING  New or changed in both paths       - file1.txt
+NOTICE: - Path1    Renaming Path1 copy                - {path1/}file1.txt..path1
+NOTICE: - Path1    Queue copy to Path2       - {path2/}file1.txt..path1
+NOTICE: - Path2    Renaming Path2 copy                - {path2/}file1.txt..path2
+NOTICE: - Path2    Queue copy to Path1       - {path1/}file1.txt..path2
+INFO  : - Path2    Do queued copies to                - Path1
+INFO  : - Path1    Do queued copies to                - Path2
+INFO  : Updating listings
+INFO  : Validating listings for Path1 "{path1/}" vs Path2 "{path2/}"
+INFO  : Bisync successful
+
+(39)  : test deletes on both sides with default suffix
+(40)  : touch-glob 2005-01-02 {datadir/} file1R.txt
+(41)  : copy-as {datadir/}file1R.txt {path2/} file1.txt
+(42)  : copy-as {datadir/}file1R.txt {path1/} file2.txt
+(43)  : touch-glob 2006-03-04 {datadir/} file1L.txt
+(44)  : copy-as {datadir/}file1L.txt {path1/} file1.txt
+(45)  : copy-as {datadir/}file1L.txt {path2/} file2.txt
+
+(46)  : test bisync run with --conflict-resolve=newer --conflict-loser=delete
+(47)  : bisync conflict-resolve=newer conflict-loser=delete
+INFO  : Setting --ignore-listing-checksum as neither --checksum nor --compare checksum are set.
+INFO  : Bisyncing with Comparison Settings:
+{
+"Modtime": true,
+"Size": true,
+"Checksum": false,
+"NoSlowHash": false,
+"SlowHashSyncOnly": false,
+"DownloadHash": false
+}
+INFO  : Synching Path1 "{path1/}" with Path2 "{path2/}"
+INFO  : Building Path1 and Path2 listings
+INFO  : Path1 checking for diffs
+INFO  : - Path1    File changed: size (larger), time (newer) - file2.txt
+INFO  : - Path1    File is new               - file1.txt
+INFO  : Path1:    2 changes:    1 new,    1 modified,    0 deleted
+INFO  : (Modified:    1 newer,    0 older,    1 larger,    0 smaller)
+INFO  : Path2 checking for diffs
+INFO  : - Path2    File changed: size (larger), time (newer) - file2.txt
+INFO  : - Path2    File is new               - file1.txt
+INFO  : Path2:    2 changes:    1 new,    1 modified,    0 deleted
+INFO  : (Modified:    1 newer,    0 older,    1 larger,    0 smaller)
+INFO  : Applying changes
+INFO  : Checking potential conflicts...
+ERROR : file1.txt: md5 differ
+ERROR : file2.txt: md5 differ
+NOTICE: {path2String}: 2 differences found
+NOTICE: {path2String}: 2 errors while checking
+INFO  : Finished checking the potential conflicts. 2 differences found
+NOTICE: - WARNING  New or changed in both paths       - file1.txt
+INFO  : file1.txt: Path1 is newer. Path1: 2006-03-04 00:00:00 +0000 UTC, Path2: 2005-01-02 00:00:00 +0000 UTC, Difference: 10224h0m0s
+INFO  : file1.txt: The winner is: Path1
+NOTICE: - Path2    Deleting Path2 copy                - {path2/}file1.txt
+INFO  : - Path1    Queue copy to Path2       - file1.txt
+NOTICE: - WARNING  New or changed in both paths       - file2.txt
+INFO  : file2.txt: Path2 is newer. Path1: 2005-01-02 00:00:00 +0000 UTC, Path2: 2006-03-04 00:00:00 +0000 UTC, Difference: 10224h0m0s
+INFO  : file2.txt: The winner is: Path2
+NOTICE: - Path1    Deleting Path1 copy                - {path1/}file2.txt
+INFO  : - Path2    Queue copy to Path1       - file2.txt
+INFO  : - Path2    Do queued copies to                - Path1
+INFO  : - Path1    Do queued copies to                - Path2
+INFO  : Updating listings
+INFO  : Validating listings for Path1 "{path1/}" vs Path2 "{path2/}"
+INFO  : Bisync successful

cmd/bisync/testdata/test_resolve/initial/RCLONE_TEST

@@ -0,0 +1 @@
+This file is used for testing the health of rclone accesses to the local/remote file system.  Do not delete.

cmd/bisync/testdata/test_resolve/modfiles/file1L.txt

@@ -0,0 +1 @@
+This file is NOT identical to 1R

cmd/bisync/testdata/test_resolve/modfiles/file1R.txt

@@ -0,0 +1 @@
+This file is NOT identical to 1L

cmd/bisync/testdata/test_resolve/modfiles/file2.txt

@@ -0,0 +1 @@
+This file is identical on both sides

cmd/bisync/testdata/test_resolve/scenario.txt

@@ -0,0 +1,67 @@
+test resolve
+# Check conflict-resolution options
+# - Changed on Path2 and on Path1, and NOT identical       file1 (file1r, file1l)
+
+test initial bisync
+bisync resync
+
+test changed on both paths and NOT identical - file1 (file1R, file1L)
+touch-glob 2001-01-02 {datadir/} file1R.txt
+copy-as {datadir/}file1R.txt {path2/} file1.txt
+touch-glob 2001-03-04 {datadir/} file1L.txt
+copy-as {datadir/}file1L.txt {path1/} file1.txt
+
+test bisync run with --conflict-resolve=newer --conflict-loser=delete --conflict-suffix=potato
+# result should be "file1.txt", "file1.txt" (no potato)
+bisync conflict-resolve=newer conflict-loser=delete conflict-suffix=potato
+
+test changed on both paths and NOT identical - file1 (file1R, file1L)
+touch-glob 2001-07-23 {datadir/} file1R.txt
+copy-as {datadir/}file1R.txt {path2/} file1.txt
+touch-glob 2001-08-26 {datadir/} file1L.txt
+copy-as {datadir/}file1L.txt {path1/} file1.txt
+
+test bisync run with --conflict-resolve=path2 --conflict-loser=num --conflict-suffix=dinosaur
+# result should be "file1.txt.dinosaur1", "file1.txt"
+bisync conflict-resolve=path2 conflict-loser=num conflict-suffix=dinosaur
+
+test changed on both paths and NOT identical - file1 (file1R, file1L)
+touch-glob 2002-07-23 {datadir/} file1R.txt
+copy-as {datadir/}file1R.txt {path2/} file1.txt
+touch-glob 2002-08-26 {datadir/} file1L.txt
+copy-as {datadir/}file1L.txt {path1/} file1.txt
+
+test bisync run with --conflict-resolve=larger --conflict-loser=num --conflict-suffix=apple
+# result should be no winner -- "file1.txt.apple1", "file1.txt.apple2"
+bisync conflict-resolve=larger conflict-loser=num conflict-suffix=apple
+
+test different suffixes
+touch-glob 2003-07-23 {datadir/} file1R.txt
+copy-as {datadir/}file1R.txt {path2/} file1.txt
+touch-glob 2003-07-23 {datadir/} file1L.txt
+copy-as {datadir/}file1L.txt {path1/} file1.txt
+
+test bisync run with --conflict-resolve=older --conflict-loser=num --conflict-suffix=cloud,local
+# result should be no winner -- "file1.txt.cloud1", "file1.txt.local1"
+bisync conflict-resolve=older conflict-loser=num conflict-suffix=cloud,local
+
+test legacy
+touch-glob 2004-07-23 {datadir/} file1R.txt
+copy-as {datadir/}file1R.txt {path2/} file1.txt
+touch-glob 2004-07-23 {datadir/} file1L.txt
+copy-as {datadir/}file1L.txt {path1/} file1.txt
+
+test bisync run with --conflict-resolve=none --conflict-loser=pathname --conflict-suffix=.path
+# result should be no winner -- "file1.txt..path1", "file1.txt..path2"
+bisync conflict-resolve=none conflict-loser=pathname conflict-suffix=.path
+
+test deletes on both sides with default suffix
+touch-glob 2005-01-02 {datadir/} file1R.txt
+copy-as {datadir/}file1R.txt {path2/} file1.txt
+copy-as {datadir/}file1R.txt {path1/} file2.txt
+touch-glob 2006-03-04 {datadir/} file1L.txt
+copy-as {datadir/}file1L.txt {path1/} file1.txt
+copy-as {datadir/}file1L.txt {path2/} file2.txt
+
+test bisync run with --conflict-resolve=newer --conflict-loser=delete
+bisync conflict-resolve=newer conflict-loser=delete

cmd/bisync/testdata/test_volatile/golden/_testdir_path1.._testdir_path2.copy1to2.que

@@ -1 +1 @@
-"file5.txt..path1"
+"file5.txt.conflict5"

cmd/bisync/testdata/test_volatile/golden/_testdir_path1.._testdir_path2.copy2to1.que

@@ -1 +1 @@
-"file5.txt..path2"
+"file5.txt.conflict6"

cmd/bisync/testdata/test_volatile/golden/_testdir_path1.._testdir_path2.path1.lst

@@ -46,8 +46,12 @@
 -       19 - - 2023-08-26T00:00:00.000000000+0000 "file47.txt"
 -       19 - - 2023-08-26T00:00:00.000000000+0000 "file48.txt"
 -       19 - - 2023-08-26T00:00:00.000000000+0000 "file49.txt"
--       39 - - 2001-03-04T00:00:00.000000000+0000 "file5.txt..path1"
--       39 - - 2001-01-02T00:00:00.000000000+0000 "file5.txt..path2"
+-       39 - - 2001-03-04T00:00:00.000000000+0000 "file5.txt.conflict1"
+-       39 - - 2001-01-02T00:00:00.000000000+0000 "file5.txt.conflict2"
+-       39 - - 2001-03-04T00:00:00.000000000+0000 "file5.txt.conflict3"
+-       39 - - 2001-01-02T00:00:00.000000000+0000 "file5.txt.conflict4"
+-       39 - - 2001-03-04T00:00:00.000000000+0000 "file5.txt.conflict5"
+-       39 - - 2001-01-02T00:00:00.000000000+0000 "file5.txt.conflict6"
 -       19 - - 2023-08-26T00:00:00.000000000+0000 "file51.txt"
 -       19 - - 2023-08-26T00:00:00.000000000+0000 "file52.txt"
 -       19 - - 2023-08-26T00:00:00.000000000+0000 "file53.txt"

cmd/bisync/testdata/test_volatile/golden/_testdir_path1.._testdir_path2.path1.lst-new

@@ -47,8 +47,10 @@
 -       19 - - 2023-08-26T00:00:00.000000000+0000 "file48.txt"
 -       19 - - 2023-08-26T00:00:00.000000000+0000 "file49.txt"
 -       39 - - 2001-03-04T00:00:00.000000000+0000 "file5.txt"
--       39 - - 2001-03-04T00:00:00.000000000+0000 "file5.txt..path1"
--       39 - - 2001-01-02T00:00:00.000000000+0000 "file5.txt..path2"
+-       39 - - 2001-03-04T00:00:00.000000000+0000 "file5.txt.conflict1"
+-       39 - - 2001-01-02T00:00:00.000000000+0000 "file5.txt.conflict2"
+-       39 - - 2001-03-04T00:00:00.000000000+0000 "file5.txt.conflict3"
+-       39 - - 2001-01-02T00:00:00.000000000+0000 "file5.txt.conflict4"
 -       19 - - 2023-08-26T00:00:00.000000000+0000 "file51.txt"
 -       19 - - 2023-08-26T00:00:00.000000000+0000 "file52.txt"
 -       19 - - 2023-08-26T00:00:00.000000000+0000 "file53.txt"

cmd/bisync/testdata/test_volatile/golden/_testdir_path1.._testdir_path2.path1.lst-old

@@ -46,8 +46,10 @@
 -       19 - - 2023-08-26T00:00:00.000000000+0000 "file47.txt"
 -       19 - - 2023-08-26T00:00:00.000000000+0000 "file48.txt"
 -       19 - - 2023-08-26T00:00:00.000000000+0000 "file49.txt"
--       39 - - 2001-03-04T00:00:00.000000000+0000 "file5.txt..path1"
--       39 - - 2001-01-02T00:00:00.000000000+0000 "file5.txt..path2"
+-       39 - - 2001-03-04T00:00:00.000000000+0000 "file5.txt.conflict1"
+-       39 - - 2001-01-02T00:00:00.000000000+0000 "file5.txt.conflict2"
+-       39 - - 2001-03-04T00:00:00.000000000+0000 "file5.txt.conflict3"
+-       39 - - 2001-01-02T00:00:00.000000000+0000 "file5.txt.conflict4"
 -       19 - - 2023-08-26T00:00:00.000000000+0000 "file51.txt"
 -       19 - - 2023-08-26T00:00:00.000000000+0000 "file52.txt"
 -       19 - - 2023-08-26T00:00:00.000000000+0000 "file53.txt"

cmd/bisync/testdata/test_volatile/golden/_testdir_path1.._testdir_path2.path2.lst

@@ -46,8 +46,12 @@
 -       19 - - 2023-08-26T00:00:00.000000000+0000 "file47.txt"
 -       19 - - 2023-08-26T00:00:00.000000000+0000 "file48.txt"
 -       19 - - 2023-08-26T00:00:00.000000000+0000 "file49.txt"
--       39 - - 2001-03-04T00:00:00.000000000+0000 "file5.txt..path1"
--       39 - - 2001-01-02T00:00:00.000000000+0000 "file5.txt..path2"
+-       39 - - 2001-03-04T00:00:00.000000000+0000 "file5.txt.conflict1"
+-       39 - - 2001-01-02T00:00:00.000000000+0000 "file5.txt.conflict2"
+-       39 - - 2001-03-04T00:00:00.000000000+0000 "file5.txt.conflict3"
+-       39 - - 2001-01-02T00:00:00.000000000+0000 "file5.txt.conflict4"
+-       39 - - 2001-03-04T00:00:00.000000000+0000 "file5.txt.conflict5"
+-       39 - - 2001-01-02T00:00:00.000000000+0000 "file5.txt.conflict6"
 -       19 - - 2023-08-26T00:00:00.000000000+0000 "file51.txt"
 -       19 - - 2023-08-26T00:00:00.000000000+0000 "file52.txt"
 -       19 - - 2023-08-26T00:00:00.000000000+0000 "file53.txt"

cmd/bisync/testdata/test_volatile/golden/_testdir_path1.._testdir_path2.path2.lst-new

@@ -47,8 +47,10 @@
 -       19 - - 2023-08-26T00:00:00.000000000+0000 "file48.txt"
 -       19 - - 2023-08-26T00:00:00.000000000+0000 "file49.txt"
 -       39 - - 2001-01-02T00:00:00.000000000+0000 "file5.txt"
--       39 - - 2001-03-04T00:00:00.000000000+0000 "file5.txt..path1"
--       39 - - 2001-01-02T00:00:00.000000000+0000 "file5.txt..path2"
+-       39 - - 2001-03-04T00:00:00.000000000+0000 "file5.txt.conflict1"
+-       39 - - 2001-01-02T00:00:00.000000000+0000 "file5.txt.conflict2"
+-       39 - - 2001-03-04T00:00:00.000000000+0000 "file5.txt.conflict3"
+-       39 - - 2001-01-02T00:00:00.000000000+0000 "file5.txt.conflict4"
 -       19 - - 2023-08-26T00:00:00.000000000+0000 "file51.txt"
 -       19 - - 2023-08-26T00:00:00.000000000+0000 "file52.txt"
 -       19 - - 2023-08-26T00:00:00.000000000+0000 "file53.txt"

cmd/bisync/testdata/test_volatile/golden/_testdir_path1.._testdir_path2.path2.lst-old

@@ -46,8 +46,10 @@
 -       19 - - 2023-08-26T00:00:00.000000000+0000 "file47.txt"
 -       19 - - 2023-08-26T00:00:00.000000000+0000 "file48.txt"
 -       19 - - 2023-08-26T00:00:00.000000000+0000 "file49.txt"
--       39 - - 2001-03-04T00:00:00.000000000+0000 "file5.txt..path1"
--       39 - - 2001-01-02T00:00:00.000000000+0000 "file5.txt..path2"
+-       39 - - 2001-03-04T00:00:00.000000000+0000 "file5.txt.conflict1"
+-       39 - - 2001-01-02T00:00:00.000000000+0000 "file5.txt.conflict2"
+-       39 - - 2001-03-04T00:00:00.000000000+0000 "file5.txt.conflict3"
+-       39 - - 2001-01-02T00:00:00.000000000+0000 "file5.txt.conflict4"
 -       19 - - 2023-08-26T00:00:00.000000000+0000 "file51.txt"
 -       19 - - 2023-08-26T00:00:00.000000000+0000 "file52.txt"
 -       19 - - 2023-08-26T00:00:00.000000000+0000 "file53.txt"

cmd/bisync/testdata/test_volatile/golden/test.log

@@ -56,10 +56,10 @@ NOTICE: {path2String}: 1 differences found
 NOTICE: {path2String}: 1 errors while checking
 INFO  : Finished checking the potential conflicts. 1 differences found
 NOTICE: - WARNING  New or changed in both paths       - file5.txt
-NOTICE: - Path1    Renaming Path1 copy                - {path1/}file5.txt..path1
-NOTICE: - Path1    Queue copy to Path2       - {path2/}file5.txt..path1
-NOTICE: - Path2    Renaming Path2 copy                - {path2/}file5.txt..path2
-NOTICE: - Path2    Queue copy to Path1       - {path1/}file5.txt..path2
+NOTICE: - Path1    Renaming Path1 copy                - {path1/}file5.txt.conflict1
+NOTICE: - Path1    Queue copy to Path2       - {path2/}file5.txt.conflict1
+NOTICE: - Path2    Renaming Path2 copy                - {path2/}file5.txt.conflict2
+NOTICE: - Path2    Queue copy to Path1       - {path1/}file5.txt.conflict2
 INFO  : - Path2    Do queued copies to                - Path1
 INFO  : - Path1    Do queued copies to                - Path2
 INFO  : Updating listings
@@ -201,10 +201,10 @@ NOTICE: {path2String}: 1 errors while checking
 INFO  : Finished checking the potential conflicts. 1 differences found
 INFO  : - Path1    Queue copy to Path2       - {path2/}file100.txt
 NOTICE: - WARNING  New or changed in both paths       - file5.txt
-NOTICE: - Path1    Renaming Path1 copy                - {path1/}file5.txt..path1
-NOTICE: - Path1    Queue copy to Path2       - {path2/}file5.txt..path1
-NOTICE: - Path2    Renaming Path2 copy                - {path2/}file5.txt..path2
-NOTICE: - Path2    Queue copy to Path1       - {path1/}file5.txt..path2
+NOTICE: - Path1    Renaming Path1 copy                - {path1/}file5.txt.conflict3
+NOTICE: - Path1    Queue copy to Path2       - {path2/}file5.txt.conflict3
+NOTICE: - Path2    Renaming Path2 copy                - {path2/}file5.txt.conflict4
+NOTICE: - Path2    Queue copy to Path1       - {path1/}file5.txt.conflict4
 INFO  : - Path1    Queue copy to Path2       - {path2/}file51.txt
 INFO  : - Path1    Queue copy to Path2       - {path2/}file52.txt
 INFO  : - Path1    Queue copy to Path2       - {path2/}file53.txt
@@ -343,10 +343,10 @@ NOTICE: {path2String}: 1 differences found
 NOTICE: {path2String}: 1 errors while checking
 INFO  : Finished checking the potential conflicts. 1 differences found
 NOTICE: - WARNING  New or changed in both paths       - file5.txt
-NOTICE: - Path1    Renaming Path1 copy                - {path1/}file5.txt..path1
-NOTICE: - Path1    Queue copy to Path2       - {path2/}file5.txt..path1
-NOTICE: - Path2    Renaming Path2 copy                - {path2/}file5.txt..path2
-NOTICE: - Path2    Queue copy to Path1       - {path1/}file5.txt..path2
+NOTICE: - Path1    Renaming Path1 copy                - {path1/}file5.txt.conflict5
+NOTICE: - Path1    Queue copy to Path2       - {path2/}file5.txt.conflict5
+NOTICE: - Path2    Renaming Path2 copy                - {path2/}file5.txt.conflict6
+NOTICE: - Path2    Queue copy to Path1       - {path1/}file5.txt.conflict6
 INFO  : - Path2    Do queued copies to                - Path1
 INFO  : - Path1    Do queued copies to                - Path2
 INFO  : Updating listings

docs/content/bisync.md

@@ -422,6 +422,152 @@ of the current filters file and compares it to the hash stored in the `.md5` fil
 If they don't match, the run aborts with a critical error and thus forces you
 to do a `--resync`, likely avoiding a disaster.
 
+### --conflict-resolve CHOICE {#conflict-resolve}
+
+In bisync, a "conflict" is a file that is *new* or *changed* on *both sides*
+(relative to the prior run) AND is *not currently identical* on both sides.
+`--conflict-resolve` controls how bisync handles such a scenario. The currently
+supported options are:
+
+- `none` - (the default) - do not attempt to pick a winner, keep and rename
+both files according to [`--conflict-loser`](#conflict-loser) and
+[`--conflict-suffix`](#conflict-suffix) settings. For example, with the default
+settings, `file.txt` on Path1 is renamed `file.txt.conflict1` and `file.txt` on
+Path2 is renamed `file.txt.conflict2`. Both are copied to the opposite path
+during the run, so both sides end up with a copy of both files. (As `none` is
+the default, it is not necessary to specify `--conflict-resolve none` -- you
+can just omit the flag.)
+- `newer` - the newer file (by `modtime`) is considered the winner and is
+copied without renaming. The older file (the "loser") is handled according to
+`--conflict-loser` and `--conflict-suffix` settings (either renamed or
+deleted.) For example, if `file.txt` on Path1 is newer than `file.txt` on
+Path2, the result on both sides (with other default settings) will be `file.txt`
+(winner from Path1) and `file.txt.conflict1` (loser from Path2).
+- `older` - same as `newer`, except the older file is considered the winner,
+and the newer file is considered the loser.
+- `larger` - the larger file (by `size`) is considered the winner (regardless
+of `modtime`, if any).
+- `smaller` - the smaller file (by `size`) is considered the winner (regardless
+of `modtime`, if any).
+- `path1` - the version from Path1 is unconditionally considered the winner
+(regardless of `modtime` and `size`, if any). This can be useful if one side is
+usually more trusted or up-to-date than the other.
+- `path2` - same as `path1`, except the path2 version is considered the
+winner.
+
+For all of the above options, note the following:
+- If either of the underlying remotes lacks support for the chosen method, it
+will be ignored and fall back to `none`. (For example, if `--conflict-resolve
+newer` is set, but one of the paths uses a remote that doesn't support
+`modtime`.)
+- If a winner can't be determined because the chosen method's attribute is
+missing or equal, it will be ignored and fall back to `none`. (For example, if
+`--conflict-resolve newer` is set, but the Path1 and Path2 modtimes are
+identical, even if the sizes may differ.)
+- If the file's content is currently identical on both sides, it is not
+considered a "conflict", even if new or changed on both sides since the prior
+sync. (For example, if you made a change on one side and then synced it to the
+other side by other means.) Therefore, none of the conflict resolution flags
+apply in this scenario.
+- The conflict resolution flags do not apply during a `--resync`, as there is
+no "prior run" to speak of (but see [`--resync-mode`](#resync-mode) for similar
+options.)
+
+### --conflict-loser CHOICE {#conflict-loser}
+
+`--conflict-loser` determines what happens to the "loser" of a sync conflict
+(when [`--conflict-resolve`](#conflict-resolve) determines a winner) or to both
+files (when there is no winner.) The currently supported options are:
+
+- `num` - (the default) - auto-number the conflicts by automatically appending
+the next available number to the `--conflict-suffix`, in chronological order.
+For example, with the default settings, the first conflict for `file.txt` will
+be renamed `file.txt.conflict1`. If `file.txt.conflict1` already exists,
+`file.txt.conflict2` will be used instead (etc., up to a maximum of
+9223372036854775807 conflicts.)
+- `pathname` - rename the conflicts according to which side they came from,
+which was the default behavior prior to `v1.66`. For example, with
+`--conflict-suffix path`, `file.txt` from Path1 will be renamed
+`file.txt.path1`, and `file.txt` from Path2 will be renamed `file.txt.path2`.
+If two non-identical suffixes are provided (ex. `--conflict-suffix
+cloud,local`), the trailing digit is omitted. Importantly, note that with
+`pathname`, there is no auto-numbering beyond `2`, so if `file.txt.path2`
+somehow already exists, it will be overwritten. Using a dynamic date variable
+in your `--conflict-suffix` (see below) is one possible way to avoid this. Note
+also that conflicts-of-conflicts are possible, if the original conflict is not
+manually resolved -- for example, if for some reason you edited
+`file.txt.path1` on both sides, and those edits were different, the result
+would be `file.txt.path1.path1` and `file.txt.path1.path2` (in addition to
+`file.txt.path2`.)
+- `delete` - keep the winner only and delete the loser, instead of renaming it.
+If a winner cannot be determined (see `--conflict-resolve` for details on how
+this could happen), `delete` is ignored and the default `num` is used instead
+(i.e. both versions are kept and renamed, and neither is deleted.) `delete` is
+inherently the most destructive option, so use it only with care.
+
+For all of the above options, note that if a winner cannot be determined (see
+`--conflict-resolve` for details on how this could happen), or if
+`--conflict-resolve` is not in use, *both* files will be renamed.
+
+### --conflict-suffix STRING[,STRING] {#conflict-suffix}
+
+`--conflict-suffix` controls the suffix that is appended when bisync renames a
+[`--conflict-loser`](#conflict-loser) (default: `conflict`).
+`--conflict-suffix` will accept either one string or two comma-separated
+strings to assign different suffixes to Path1 vs. Path2. This may be helpful
+later in identifying the source of the conflict. (For example,
+`--conflict-suffix dropboxconflict,laptopconflict`)
+
+With `--conflict-loser num`, a number is always appended to the suffix. With
+`--conflict-loser pathname`, a number is appended only when one suffix is
+specified (or when two identical suffixes are specified.) i.e. with
+`--conflict-loser pathname`, all of the following would produce exactly the
+same result:
+
+```
+--conflict-suffix path
+--conflict-suffix path,path
+--conflict-suffix path1,path2
+```
+
+Suffixes may be as short as 1 character. By default, the suffix is appended
+after any other extensions (ex. `file.jpg.conflict1`), however, this can be
+changed with the [`--suffix-keep-extension`](/docs/#suffix-keep-extension) flag
+(i.e. to instead result in `file.conflict1.jpg`).
+
+`--conflict-suffix` supports several *dynamic date variables* when enclosed in
+curly braces as globs. This can be helpful to track the date and/or time that
+each conflict was handled by bisync. For example:
+
+```
+--conflict-suffix {DateOnly}-conflict
+// result: myfile.txt.2006-01-02-conflict1
+```
+
+All of the formats described [here](https://pkg.go.dev/time#pkg-constants) and
+[here](https://pkg.go.dev/time#example-Time.Format) are supported, but take
+care to ensure that your chosen format does not use any characters that are
+illegal on your remotes (for example, macOS does not allow colons in
+filenames, and slashes are also best avoided as they are often interpreted as
+directory separators.) To address this particular issue, an additional
+`{MacFriendlyTime}` (or just `{mac}`) option is supported, which results in
+`2006-01-02 0304PM`.
+
+Note that `--conflict-suffix` is entirely separate from rclone's main
+[`--sufix`](/docs/#suffix-suffix) flag. This is intentional, as users may wish
+to use both flags simultaneously, if also using
+[`--backup-dir`](#backup-dir1-and-backup-dir2).
+
+Finally, note that the default in bisync prior to `v1.66` was to rename
+conflicts with `..path1` and `..path2` (with two periods, and `path` instead of
+`conflict`.) Bisync now defaults to a single dot instead of a double dot, but
+additional dots can be added by including them in the specified suffix string.
+For example, for behavior equivalent to the previous default, use:
+
+```
+[--conflict-resolve none] --conflict-loser pathname --conflict-suffix .path
+```
+
 ### --check-sync
 
 Enabled by default, the check-sync function checks that all of the same
@@ -610,7 +756,7 @@ the other side by moving the corresponding file from `gdrive:Bisync` to
 moves it from `/Users/someuser/some/local/path/Bisync` to
 `/Users/someuser/some/local/path/BackupDir`.
 
-In the event of a `..path1` / `..path2` rename due to a sync conflict, the
+In the event of a [rename due to a sync conflict](#conflict-loser), the
 rename is not considered a delete, unless a previous conflict with the same
 name already exists and would get overwritten.
 
@@ -634,7 +780,8 @@ On each successive run it will:
 - Lock file prevents multiple simultaneous runs when taking a while.
   This can be particularly useful if bisync is run by cron scheduler.
 - Handle change conflicts non-destructively by creating
-  `..path1` and `..path2` file versions.
+  `.conflict1`, `.conflict2`, etc. file versions, according to
+  [`--conflict-resolve`](#conflict-resolve), [`--conflict-loser`](#conflict-loser), and [`--conflict-suffix`](#conflict-suffix) settings.
 - File system access health check using `RCLONE_TEST` files
   (see the `--check-access` flag).
 - Abort on excessive deletes - protects against a failed listing
@@ -661,8 +808,8 @@ Path1 deleted | File no longer exists on Path1                | File is deleted
  Type                           | Description                           | Result                             | Implementation
 --------------------------------|---------------------------------------|------------------------------------|-----------------------
 Path1 new/changed AND Path2 new/changed AND Path1 == Path2       | File is new/changed on Path1 AND new/changed on Path2 AND Path1 version is currently identical to Path2 | No change | None
-Path1 new AND Path2 new         | File is new on Path1 AND new on Path2 (and Path1 version is NOT identical to Path2) | Files renamed to _Path1 and _Path2 | `rclone copy` _Path2 file to Path1, `rclone copy` _Path1 file to Path2
-Path2 newer AND Path1 changed   | File is newer on Path2 AND also changed (newer/older/size) on Path1 (and Path1 version is NOT identical to Path2) | Files renamed to _Path1 and _Path2 | `rclone copy` _Path2 file to Path1, `rclone copy` _Path1 file to Path2
+Path1 new AND Path2 new         | File is new on Path1 AND new on Path2 (and Path1 version is NOT identical to Path2) | Conflicts handled according to [`--conflict-resolve`](#conflict-resolve) & [`--conflict-loser`](#conflict-loser) settings | default: `rclone copy` renamed `Path2.conflict2` file to Path1, `rclone copy` renamed `Path1.conflict1` file to Path2
+Path2 newer AND Path1 changed   | File is newer on Path2 AND also changed (newer/older/size) on Path1 (and Path1 version is NOT identical to Path2) | Conflicts handled according to [`--conflict-resolve`](#conflict-resolve) & [`--conflict-loser`](#conflict-loser) settings | default: `rclone copy` renamed `Path2.conflict2` file to Path1, `rclone copy` renamed `Path1.conflict1` file to Path2
 Path2 newer AND Path1 deleted   | File is newer on Path2 AND also deleted on Path1 | Path2 version survives  | `rclone copy` Path2 to Path1
 Path2 deleted AND Path1 changed | File is deleted on Path2 AND changed (newer/older/size) on Path1 | Path1 version survives |`rclone copy` Path1 to Path2
 Path1 deleted AND Path2 changed | File is deleted on Path1 AND changed (newer/older/size) on Path2 | Path2 version survives  | `rclone copy` Path2 to Path1
@@ -673,7 +820,7 @@ Now, when bisync comes to a file that it wants to rename (because it is new/chan
 it first checks whether the Path1 and Path2 versions are currently *identical* 
 (using the same underlying function as [`check`](commands/rclone_check/).) 
 If bisync concludes that the files are identical, it will skip them and move on. 
-Otherwise, it will create renamed `..Path1` and `..Path2` duplicates, as before. 
+Otherwise, it will create renamed duplicates, as before.
 This behavior also [improves the experience of renaming directories](https://forum.rclone.org/t/bisync-bugs-and-feature-requests/37636#:~:text=Renamed%20directories), 
 as a `--resync` is no longer required, so long as the same change has been made on both sides.
 
@@ -1604,6 +1751,7 @@ instead of of `--size-only`, when `check` is not available.
 * Bisync now supports a "Graceful Shutdown" mode to cleanly cancel a run early without requiring `--resync`.
 * New `--recover` flag allows robust recovery in the event of interruptions, without requiring `--resync`.
 * A new `--max-lock` setting allows lock files to automatically renew and expire, for better automatic recovery when a run is interrupted.
+* Bisync now supports auto-resolving sync conflicts and customizing rename behavior with new [`--conflict-resolve`](#conflict-resolve), [`--conflict-loser`](#conflict-loser), and [`--conflict-suffix`](#conflict-suffix) flags.
 
 ### `v1.64`
 * Fixed an [issue](https://forum.rclone.org/t/bisync-bugs-and-feature-requests/37636#:~:text=1.%20Dry%20runs%20are%20not%20completely%20dry)