operations: Add skip all, do all, quit operations to --interactive - fixes #3886

This also adds SkipDestructive into all the remaing places --dry-run
was used and adds documentation.

docs/content/docs.md

@@ -73,6 +73,9 @@ storage system in the config file then the sub path, eg
 
 You can define as many storage paths as you like in the config file.
 
+Please use the [`-i` / `--interactive`](#interactive) flag while
+learning rclone to avoid accidental data loss.
+
 Subcommands
 -----------
 
@@ -686,7 +689,45 @@ This can be useful as an additional layer of protection for immutable
 or append-only data sets (notably backup archives), where modification
 implies corruption and should not be propagated.
 
-## --leave-root ###
+### -i / --interactive {#interactive}
+
+This flag can be used to tell rclone that you wish a manual
+confirmation before destructive operations.
+
+It is **recommended** that you use this flag while learning rclone
+especially with `rclone sync`.
+
+For example
+
+```
+$ rclone delete -i /tmp/dir
+rclone: delete "important-file.txt"?
+y) Yes, this is OK (default)
+n) No, skip this
+s) Skip all delete operations with no more questions
+!) Do all delete operations with no more questions
+q) Exit rclone now.
+y/n/s/!/q> n
+```
+
+The options mean
+
+- `y`: **Yes**, this operation should go ahead. You can also press Return
+  for this to happen. You'll be asked every time unless you choose `s`
+  or `!`.
+- `n`: **No**, do not do this operation. You'll be asked every time unless
+  you choose `s` or `!`.
+- `s`: **Skip** all the following operations of this type with no more
+  questions. This takes effect until rclone exits. If there are any
+  different kind of operations you'll be prompted for them.
+- `!`: **Do all** the following operations with no more
+  questions. Useful if you've decided that you don't mind rclone doing
+  that kind of operation. This takes effect until rclone exits . If
+  there are any different kind of operations you'll be prompted for
+  them.
+- `q`: **Quit** rclone now, just in case!
+
+### --leave-root ####
 
 During rmdirs it will not remove root directory, even if it's empty.
 

fs/operations/dedupe.go

@@ -44,7 +44,7 @@ outer:
 			newName = fmt.Sprintf("%s-%d%s", base, i+suffix, ext)
 			_, err = f.NewObject(ctx, newName)
 		}
-		if !skipDestructive(ctx, o, "rename") {
+		if !SkipDestructive(ctx, o, "rename") {
 			newObj, err := doMove(ctx, o, newName)
 			if err != nil {
 				err = fs.CountError(err)
@@ -253,7 +253,7 @@ func dedupeMergeDuplicateDirs(ctx context.Context, f fs.Fs, duplicateDirs [][]fs
 		return errors.Errorf("%v: can't flush dir cache", f)
 	}
 	for _, dirs := range duplicateDirs {
-		if !skipDestructive(ctx, dirs[0], "merge duplicate directories") {
+		if !SkipDestructive(ctx, dirs[0], "merge duplicate directories") {
 			fs.Infof(dirs[0], "Merging contents of duplicate directories")
 			err := mergeDirs(ctx, dirs)
 			if err != nil {

fs/operations/operations.go

@@ -11,6 +11,7 @@ import (
 	"io"
 	"io/ioutil"
 	"net/http"
+	"os"
 	"path"
 	"path/filepath"
 	"sort"
@@ -31,6 +32,7 @@ import (
 	"github.com/rclone/rclone/fs/march"
 	"github.com/rclone/rclone/fs/object"
 	"github.com/rclone/rclone/fs/walk"
+	"github.com/rclone/rclone/lib/atexit"
 	"github.com/rclone/rclone/lib/random"
 	"github.com/rclone/rclone/lib/readers"
 	"golang.org/x/sync/errgroup"
@@ -212,7 +214,7 @@ func equal(ctx context.Context, src fs.ObjectInfo, dst fs.Object, opt equalOpt)
 
 	// mod time differs but hash is the same to reset mod time if required
 	if opt.updateModTime {
-		if !skipDestructive(ctx, src, "update modification time") {
+		if !SkipDestructive(ctx, src, "update modification time") {
 			// Size and hash the same but mtime different
 			// Error if objects are treated as immutable
 			if fs.Config.Immutable {
@@ -347,7 +349,7 @@ func Copy(ctx context.Context, f fs.Fs, dst fs.Object, remote string, src fs.Obj
 		tr.Done(err)
 	}()
 	newDst = dst
-	if skipDestructive(ctx, src, "copy") {
+	if SkipDestructive(ctx, src, "copy") {
 		return newDst, nil
 	}
 	maxTries := fs.Config.LowLevelRetries
@@ -525,7 +527,7 @@ func Move(ctx context.Context, fdst fs.Fs, dst fs.Object, remote string, src fs.
 		tr.Done(err)
 	}()
 	newDst = dst
-	if skipDestructive(ctx, src, "move") {
+	if SkipDestructive(ctx, src, "move") {
 		return newDst, nil
 	}
 	// See if we have Move available
@@ -604,7 +606,8 @@ func DeleteFileWithBackupDir(ctx context.Context, dst fs.Object, backupDir fs.Fs
 	if backupDir != nil {
 		action, actioned = "move into backup dir", "Moved into backup dir"
 	}
-	if skipDestructive(ctx, dst, action) {
+	skip := SkipDestructive(ctx, dst, action)
+	if skip {
 		// do nothing
 	} else if backupDir != nil {
 		err = MoveBackupDir(ctx, backupDir, dst)
@@ -614,7 +617,7 @@ func DeleteFileWithBackupDir(ctx context.Context, dst fs.Object, backupDir fs.Fs
 	if err != nil {
 		fs.Errorf(dst, "Couldn't %s: %v", action, err)
 		err = fs.CountError(err)
-	} else if !fs.Config.DryRun {
+	} else if !skip {
 		fs.Infof(dst, actioned)
 	}
 	return err
@@ -1135,8 +1138,7 @@ func ListDir(ctx context.Context, f fs.Fs, w io.Writer) error {
 
 // Mkdir makes a destination directory or container
 func Mkdir(ctx context.Context, f fs.Fs, dir string) error {
-	if fs.Config.DryRun {
-		fs.Logf(fs.LogDirName(f, dir), "Not making directory as dry run is set")
+	if SkipDestructive(ctx, fs.LogDirName(f, dir), "make directory") {
 		return nil
 	}
 	fs.Debugf(fs.LogDirName(f, dir), "Making directory")
@@ -1151,7 +1153,7 @@ func Mkdir(ctx context.Context, f fs.Fs, dir string) error {
 // TryRmdir removes a container but not if not empty.  It doesn't
 // count errors but may return one.
 func TryRmdir(ctx context.Context, f fs.Fs, dir string) error {
-	if skipDestructive(ctx, fs.LogDirName(f, dir), "remove directory") {
+	if SkipDestructive(ctx, fs.LogDirName(f, dir), "remove directory") {
 		return nil
 	}
 	fs.Debugf(fs.LogDirName(f, dir), "Removing directory")
@@ -1176,13 +1178,12 @@ func Purge(ctx context.Context, f fs.Fs, dir string) error {
 		// FIXME change the Purge interface so it takes a dir - see #1891
 		if doPurge := f.Features().Purge; doPurge != nil {
 			doFallbackPurge = false
-			if skipDestructive(ctx, fs.LogDirName(f, dir), "purge directory") {
+			if SkipDestructive(ctx, fs.LogDirName(f, dir), "purge directory") {
 				return nil
-			} else {
-				err = doPurge(ctx)
-				if err == fs.ErrorCantPurge {
-					doFallbackPurge = true
-				}
+			}
+			err = doPurge(ctx)
+			if err == fs.ErrorCantPurge {
+				doFallbackPurge = true
 			}
 		}
 	}
@@ -1251,7 +1252,7 @@ func CleanUp(ctx context.Context, f fs.Fs) error {
 	if doCleanUp == nil {
 		return errors.Errorf("%v doesn't support cleanup", f)
 	}
-	if skipDestructive(ctx, f, "clean up old files") {
+	if SkipDestructive(ctx, f, "clean up old files") {
 		return nil
 	}
 	return doCleanUp(ctx)
@@ -1389,7 +1390,7 @@ func Rcat(ctx context.Context, fdst fs.Fs, dstFileName string, in io.ReadCloser,
 		fStreamTo = tmpLocalFs
 	}
 
-	if skipDestructive(ctx, dstFileName, "upload from pipe") {
+	if SkipDestructive(ctx, dstFileName, "upload from pipe") {
 		// prevents "broken pipe" errors
 		_, err = io.Copy(ioutil.Discard, in)
 		return nil, err
@@ -1671,7 +1672,7 @@ func RcatSize(ctx context.Context, fdst fs.Fs, dstFileName string, in io.ReadClo
 		body := ioutil.NopCloser(in) // we let the server close the body
 		in := tr.Account(body)       // account the transfer (no buffering)
 
-		if skipDestructive(ctx, dstFileName, "upload from pipe") {
+		if SkipDestructive(ctx, dstFileName, "upload from pipe") {
 			// prevents "broken pipe" errors
 			_, err = io.Copy(ioutil.Discard, in)
 			return nil, err
@@ -2187,25 +2188,73 @@ func GetFsInfo(f fs.Fs) *FsInfo {
 	return info
 }
 
-var interactiveMutex sync.Mutex
+var (
+	interactiveMu sync.Mutex
+	skipped       = map[string]bool{}
+)
 
-func skipDestructive(ctx context.Context, subject interface{}, action string) bool {
-	var (
-		flag string
-		skip bool
-	)
+// skipDestructiveChoose asks the user which action to take
+//
+// Call with interactiveMu held
+func skipDestructiveChoose(ctx context.Context, subject interface{}, action string) (skip bool) {
+	fmt.Printf("rclone: %s \"%v\"?\n", action, subject)
+	switch i := config.CommandDefault([]string{
+		"yYes, this is OK",
+		"nNo, skip this",
+		fmt.Sprintf("sSkip all %s operations with no more questions", action),
+		fmt.Sprintf("!Do all %s operations with no more questions", action),
+		"qExit rclone now.",
+	}, 0); i {
+	case 'y':
+		skip = false
+	case 'n':
+		skip = true
+	case 's':
+		skip = true
+		skipped[action] = true
+		fs.Logf(nil, "Skipping all %s operations from now on without asking", action)
+	case '!':
+		skip = false
+		skipped[action] = false
+		fs.Logf(nil, "Doing all %s operations from now on without asking", action)
+	case 'q':
+		fs.Logf(nil, "Quitting rclone now")
+		atexit.Run()
+		os.Exit(0)
+	default:
+		skip = true
+		fs.Errorf(nil, "Bad choice %c", i)
+	}
+	return skip
+}
+
+// SkipDestructive should be called whenever rclone is about to do an destructive operation.
+//
+// It will check the --dry-run flag and it will ask the user if the --interactive flag is set.
+//
+// subject should be the object or directory in use
+//
+// action should be a descriptive word or short phrase
+//
+// Together they should make sense in this sentence: "Rclone is about
+// to action subject".
+func SkipDestructive(ctx context.Context, subject interface{}, action string) (skip bool) {
+	var flag string
 	switch {
 	case fs.Config.DryRun:
 		flag = "--dry-run"
 		skip = true
 	case fs.Config.Interactive:
 		flag = "--interactive"
-		interactiveMutex.Lock()
-		defer interactiveMutex.Unlock()
-		fmt.Printf("rclone: %s \"%v\"?\n", action, subject)
-		skip = !config.Confirm(true)
+		interactiveMu.Lock()
+		defer interactiveMu.Unlock()
+		var found bool
+		skip, found = skipped[action]
+		if !found {
+			skip = skipDestructiveChoose(ctx, subject, action)
+		}
 	default:
-		skip = false
+		return false
 	}
 	if skip {
 		fs.Logf(subject, "Skipped %s as %s is set", action, flag)

fs/sync/sync.go

@@ -1063,8 +1063,7 @@ func MoveDir(ctx context.Context, fdst, fsrc fs.Fs, deleteEmptySrcDirs bool, cop
 
 	// First attempt to use DirMover if exists, same Fs and no filters are active
 	if fdstDirMove := fdst.Features().DirMove; fdstDirMove != nil && operations.SameConfig(fsrc, fdst) && filter.Active.InActive() {
-		if fs.Config.DryRun {
-			fs.Logf(fdst, "Not doing server side directory move as --dry-run")
+		if operations.SkipDestructive(ctx, fdst, "server side directory move") {
 			return nil
 		}
 		fs.Debugf(fdst, "Using server side directory move")