mirror of
https://github.com/rclone/rclone.git
synced 2024-11-07 17:14:44 +01:00
c0968a0987
Logger instruments the Sync routine with a status report for each file pair, making it possible to output a list of the synced files, along with their attributes and sigil categorization (match/differ/missing/etc.) It is very customizable by passing in a custom LoggerFn, options, and io.Writers to be written to. Possible uses include: - allow sync to write path lists to a file, in the same format as rclone check - allow sync to output a --dest-after file using the same format flags as lsf - receive results as JSON when calling sync from an internal function - predict the post-sync state of the destination For usage examples, see bisync.WriteResults() or sync.SyncLoggerFn()
610 lines
17 KiB
Go
610 lines
17 KiB
Go
package operations
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import (
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"bufio"
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"bytes"
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"context"
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"errors"
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"fmt"
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"io"
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"os"
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"regexp"
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"strings"
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"sync"
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"sync/atomic"
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"github.com/rclone/rclone/fs"
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"github.com/rclone/rclone/fs/accounting"
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"github.com/rclone/rclone/fs/filter"
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"github.com/rclone/rclone/fs/fserrors"
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"github.com/rclone/rclone/fs/hash"
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"github.com/rclone/rclone/fs/march"
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"github.com/rclone/rclone/lib/readers"
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"golang.org/x/text/unicode/norm"
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)
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// checkFn is the type of the checking function used in CheckFn()
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//
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// It should check the two objects (a, b) and return if they differ
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// and whether the hash was used.
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//
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// If there are differences then this should Errorf the difference and
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// the reason but return with err = nil. It should not CountError in
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// this case.
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type checkFn func(ctx context.Context, a, b fs.Object) (differ bool, noHash bool, err error)
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// CheckOpt contains options for the Check functions
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type CheckOpt struct {
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Fdst, Fsrc fs.Fs // fses to check
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Check checkFn // function to use for checking
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OneWay bool // one way only?
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Combined io.Writer // a file with file names with leading sigils
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MissingOnSrc io.Writer // files only in the destination
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MissingOnDst io.Writer // files only in the source
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Match io.Writer // matching files
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Differ io.Writer // differing files
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Error io.Writer // files with errors of some kind
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}
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// checkMarch is used to march over two Fses in the same way as
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// sync/copy
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type checkMarch struct {
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ioMu sync.Mutex
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wg sync.WaitGroup
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tokens chan struct{}
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differences atomic.Int32
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noHashes atomic.Int32
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srcFilesMissing atomic.Int32
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dstFilesMissing atomic.Int32
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matches atomic.Int32
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opt CheckOpt
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}
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// report outputs the fileName to out if required and to the combined log
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func (c *checkMarch) report(o fs.DirEntry, out io.Writer, sigil rune) {
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c.reportFilename(o.String(), out, sigil)
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}
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func (c *checkMarch) reportFilename(filename string, out io.Writer, sigil rune) {
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if out != nil {
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SyncFprintf(out, "%s\n", filename)
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}
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if c.opt.Combined != nil {
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SyncFprintf(c.opt.Combined, "%c %s\n", sigil, filename)
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}
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}
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// DstOnly have an object which is in the destination only
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func (c *checkMarch) DstOnly(dst fs.DirEntry) (recurse bool) {
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switch dst.(type) {
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case fs.Object:
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if c.opt.OneWay {
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return false
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}
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err := fmt.Errorf("file not in %v", c.opt.Fsrc)
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fs.Errorf(dst, "%v", err)
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_ = fs.CountError(err)
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c.differences.Add(1)
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c.srcFilesMissing.Add(1)
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c.report(dst, c.opt.MissingOnSrc, '-')
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case fs.Directory:
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// Do the same thing to the entire contents of the directory
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if c.opt.OneWay {
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return false
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}
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return true
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default:
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panic("Bad object in DirEntries")
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}
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return false
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}
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// SrcOnly have an object which is in the source only
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func (c *checkMarch) SrcOnly(src fs.DirEntry) (recurse bool) {
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switch src.(type) {
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case fs.Object:
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err := fmt.Errorf("file not in %v", c.opt.Fdst)
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fs.Errorf(src, "%v", err)
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_ = fs.CountError(err)
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c.differences.Add(1)
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c.dstFilesMissing.Add(1)
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c.report(src, c.opt.MissingOnDst, '+')
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case fs.Directory:
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// Do the same thing to the entire contents of the directory
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return true
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default:
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panic("Bad object in DirEntries")
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}
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return false
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}
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// check to see if two objects are identical using the check function
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func (c *checkMarch) checkIdentical(ctx context.Context, dst, src fs.Object) (differ bool, noHash bool, err error) {
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ci := fs.GetConfig(ctx)
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tr := accounting.Stats(ctx).NewCheckingTransfer(src, "checking")
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defer func() {
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tr.Done(ctx, err)
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}()
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if sizeDiffers(ctx, src, dst) {
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err = fmt.Errorf("sizes differ")
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fs.Errorf(src, "%v", err)
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return true, false, nil
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}
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if ci.SizeOnly {
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return false, false, nil
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}
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return c.opt.Check(ctx, dst, src)
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}
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// Match is called when src and dst are present, so sync src to dst
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func (c *checkMarch) Match(ctx context.Context, dst, src fs.DirEntry) (recurse bool) {
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switch srcX := src.(type) {
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case fs.Object:
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dstX, ok := dst.(fs.Object)
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if ok {
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if SkipDestructive(ctx, src, "check") {
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return false
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}
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c.wg.Add(1)
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c.tokens <- struct{}{} // put a token to limit concurrency
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go func() {
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defer func() {
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<-c.tokens // get the token back to free up a slot
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c.wg.Done()
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}()
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differ, noHash, err := c.checkIdentical(ctx, dstX, srcX)
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if err != nil {
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fs.Errorf(src, "%v", err)
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_ = fs.CountError(err)
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c.report(src, c.opt.Error, '!')
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} else if differ {
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c.differences.Add(1)
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err := errors.New("files differ")
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// the checkFn has already logged the reason
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_ = fs.CountError(err)
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c.report(src, c.opt.Differ, '*')
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} else {
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c.matches.Add(1)
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c.report(src, c.opt.Match, '=')
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if noHash {
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c.noHashes.Add(1)
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fs.Debugf(dstX, "OK - could not check hash")
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} else {
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fs.Debugf(dstX, "OK")
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}
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}
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}()
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} else {
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err := fmt.Errorf("is file on %v but directory on %v", c.opt.Fsrc, c.opt.Fdst)
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fs.Errorf(src, "%v", err)
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_ = fs.CountError(err)
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c.differences.Add(1)
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c.dstFilesMissing.Add(1)
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c.report(src, c.opt.MissingOnDst, '+')
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}
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case fs.Directory:
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// Do the same thing to the entire contents of the directory
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_, ok := dst.(fs.Directory)
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if ok {
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return true
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}
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err := fmt.Errorf("is file on %v but directory on %v", c.opt.Fdst, c.opt.Fsrc)
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fs.Errorf(dst, "%v", err)
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_ = fs.CountError(err)
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c.differences.Add(1)
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c.srcFilesMissing.Add(1)
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c.report(dst, c.opt.MissingOnSrc, '-')
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default:
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panic("Bad object in DirEntries")
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}
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return false
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}
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// CheckFn checks the files in fsrc and fdst according to Size and
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// hash using checkFunction on each file to check the hashes.
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//
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// checkFunction sees if dst and src are identical
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//
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// it returns true if differences were found
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// it also returns whether it couldn't be hashed
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func CheckFn(ctx context.Context, opt *CheckOpt) error {
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ci := fs.GetConfig(ctx)
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if opt.Check == nil {
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return errors.New("internal error: nil check function")
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}
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c := &checkMarch{
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tokens: make(chan struct{}, ci.Checkers),
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opt: *opt,
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}
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// set up a march over fdst and fsrc
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m := &march.March{
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Ctx: ctx,
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Fdst: c.opt.Fdst,
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Fsrc: c.opt.Fsrc,
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Dir: "",
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Callback: c,
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NoTraverse: ci.NoTraverse,
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NoUnicodeNormalization: ci.NoUnicodeNormalization,
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}
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fs.Debugf(c.opt.Fdst, "Waiting for checks to finish")
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err := m.Run(ctx)
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c.wg.Wait() // wait for background go-routines
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return c.reportResults(ctx, err)
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}
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func (c *checkMarch) reportResults(ctx context.Context, err error) error {
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if c.dstFilesMissing.Load() > 0 {
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fs.Logf(c.opt.Fdst, "%d files missing", c.dstFilesMissing.Load())
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}
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if c.srcFilesMissing.Load() > 0 {
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entity := "files"
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if c.opt.Fsrc == nil {
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entity = "hashes"
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}
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fs.Logf(c.opt.Fsrc, "%d %s missing", c.srcFilesMissing.Load(), entity)
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}
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fs.Logf(c.opt.Fdst, "%d differences found", accounting.Stats(ctx).GetErrors())
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if errs := accounting.Stats(ctx).GetErrors(); errs > 0 {
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fs.Logf(c.opt.Fdst, "%d errors while checking", errs)
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}
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if c.noHashes.Load() > 0 {
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fs.Logf(c.opt.Fdst, "%d hashes could not be checked", c.noHashes.Load())
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}
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if c.matches.Load() > 0 {
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fs.Logf(c.opt.Fdst, "%d matching files", c.matches.Load())
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}
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if err != nil {
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return err
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}
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if c.differences.Load() > 0 {
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// Return an already counted error so we don't double count this error too
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err = fserrors.FsError(fmt.Errorf("%d differences found", c.differences.Load()))
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fserrors.Count(err)
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return err
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}
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return nil
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}
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// Check the files in fsrc and fdst according to Size and hash
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func Check(ctx context.Context, opt *CheckOpt) error {
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optCopy := *opt
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optCopy.Check = func(ctx context.Context, dst, src fs.Object) (differ bool, noHash bool, err error) {
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same, ht, err := CheckHashes(ctx, src, dst)
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if err != nil {
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return true, false, err
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}
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if ht == hash.None {
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return false, true, nil
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}
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if !same {
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err = fmt.Errorf("%v differ", ht)
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fs.Errorf(src, "%v", err)
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return true, false, nil
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}
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return false, false, nil
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}
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return CheckFn(ctx, &optCopy)
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}
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// CheckEqualReaders checks to see if in1 and in2 have the same
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// content when read.
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//
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// it returns true if differences were found
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func CheckEqualReaders(in1, in2 io.Reader) (differ bool, err error) {
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const bufSize = 64 * 1024
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buf1 := make([]byte, bufSize)
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buf2 := make([]byte, bufSize)
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for {
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n1, err1 := readers.ReadFill(in1, buf1)
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n2, err2 := readers.ReadFill(in2, buf2)
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// check errors
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if err1 != nil && err1 != io.EOF {
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return true, err1
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} else if err2 != nil && err2 != io.EOF {
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return true, err2
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}
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// err1 && err2 are nil or io.EOF here
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// process the data
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if n1 != n2 || !bytes.Equal(buf1[:n1], buf2[:n2]) {
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return true, nil
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}
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// if both streams finished the we have finished
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if err1 == io.EOF && err2 == io.EOF {
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break
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}
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}
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return false, nil
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}
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// CheckIdenticalDownload checks to see if dst and src are identical
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// by reading all their bytes if necessary.
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//
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// it returns true if differences were found
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func CheckIdenticalDownload(ctx context.Context, dst, src fs.Object) (differ bool, err error) {
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ci := fs.GetConfig(ctx)
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err = Retry(ctx, src, ci.LowLevelRetries, func() error {
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differ, err = checkIdenticalDownload(ctx, dst, src)
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return err
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})
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return differ, err
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}
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// Does the work for CheckIdenticalDownload
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func checkIdenticalDownload(ctx context.Context, dst, src fs.Object) (differ bool, err error) {
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var in1, in2 io.ReadCloser
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in1, err = Open(ctx, dst)
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if err != nil {
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return true, fmt.Errorf("failed to open %q: %w", dst, err)
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}
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tr1 := accounting.Stats(ctx).NewTransfer(dst)
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defer func() {
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tr1.Done(ctx, nil) // error handling is done by the caller
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}()
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in1 = tr1.Account(ctx, in1).WithBuffer() // account and buffer the transfer
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in2, err = Open(ctx, src)
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if err != nil {
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return true, fmt.Errorf("failed to open %q: %w", src, err)
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}
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tr2 := accounting.Stats(ctx).NewTransfer(dst)
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defer func() {
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tr2.Done(ctx, nil) // error handling is done by the caller
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}()
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in2 = tr2.Account(ctx, in2).WithBuffer() // account and buffer the transfer
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// To assign err variable before defer.
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differ, err = CheckEqualReaders(in1, in2)
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return
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}
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// CheckDownload checks the files in fsrc and fdst according to Size
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// and the actual contents of the files.
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func CheckDownload(ctx context.Context, opt *CheckOpt) error {
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optCopy := *opt
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optCopy.Check = func(ctx context.Context, a, b fs.Object) (differ bool, noHash bool, err error) {
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differ, err = CheckIdenticalDownload(ctx, a, b)
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if err != nil {
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return true, true, fmt.Errorf("failed to download: %w", err)
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}
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return differ, false, nil
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}
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return CheckFn(ctx, &optCopy)
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}
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// ApplyTransforms handles --no-unicode-normalization and --ignore-case-sync for CheckSum
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// so that it matches behavior of Check (where it's handled by March)
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func ApplyTransforms(ctx context.Context, s string) string {
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ci := fs.GetConfig(ctx)
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if !ci.NoUnicodeNormalization {
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s = norm.NFC.String(s)
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}
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if ci.IgnoreCaseSync {
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s = strings.ToLower(s)
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}
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return s
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}
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// CheckSum checks filesystem hashes against a SUM file
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func CheckSum(ctx context.Context, fsrc, fsum fs.Fs, sumFile string, hashType hash.Type, opt *CheckOpt, download bool) error {
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var options CheckOpt
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if opt != nil {
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options = *opt
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} else {
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// default options for hashsum -c
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options.Combined = os.Stdout
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}
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// CheckSum treats Fsrc and Fdst specially:
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options.Fsrc = nil // no file system here, corresponds to the sum list
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options.Fdst = fsrc // denotes the file system to check
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opt = &options // override supplied argument
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if !download && (hashType == hash.None || !opt.Fdst.Hashes().Contains(hashType)) {
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return fmt.Errorf("%s: hash type is not supported by file system: %s", hashType, opt.Fdst)
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}
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if sumFile == "" {
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return fmt.Errorf("not a sum file: %s", fsum)
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}
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sumObj, err := fsum.NewObject(ctx, sumFile)
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if err != nil {
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return fmt.Errorf("cannot open sum file: %w", err)
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}
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hashes, err := ParseSumFile(ctx, sumObj)
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if err != nil {
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return fmt.Errorf("failed to parse sum file: %w", err)
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}
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ci := fs.GetConfig(ctx)
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c := &checkMarch{
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tokens: make(chan struct{}, ci.Checkers),
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opt: *opt,
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}
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lastErr := ListFn(ctx, opt.Fdst, func(obj fs.Object) {
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c.checkSum(ctx, obj, download, hashes, hashType)
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})
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c.wg.Wait() // wait for background go-routines
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// make census of unhandled sums
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fi := filter.GetConfig(ctx)
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for filename, hash := range hashes {
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if hash == "" { // the sum has been successfully consumed
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continue
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}
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if !fi.IncludeRemote(filename) { // the file was filtered out
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continue
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}
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// filesystem missed the file, sum wasn't consumed
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err := fmt.Errorf("file not in %v", opt.Fdst)
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fs.Errorf(filename, "%v", err)
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_ = fs.CountError(err)
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if lastErr == nil {
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lastErr = err
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}
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c.dstFilesMissing.Add(1)
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c.reportFilename(filename, opt.MissingOnDst, '+')
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}
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return c.reportResults(ctx, lastErr)
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}
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// checkSum checks single object against golden hashes
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func (c *checkMarch) checkSum(ctx context.Context, obj fs.Object, download bool, hashes HashSums, hashType hash.Type) {
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normalizedRemote := ApplyTransforms(ctx, obj.Remote())
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c.ioMu.Lock()
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sumHash, sumFound := hashes[normalizedRemote]
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hashes[normalizedRemote] = "" // mark sum as consumed
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c.ioMu.Unlock()
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if !sumFound && c.opt.OneWay {
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return
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}
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var err error
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tr := accounting.Stats(ctx).NewCheckingTransfer(obj, "hashing")
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defer tr.Done(ctx, err)
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if !sumFound {
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err = errors.New("sum not found")
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_ = fs.CountError(err)
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fs.Errorf(obj, "%v", err)
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c.differences.Add(1)
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c.srcFilesMissing.Add(1)
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c.report(obj, c.opt.MissingOnSrc, '-')
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return
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}
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if !download {
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var objHash string
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objHash, err = obj.Hash(ctx, hashType)
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c.matchSum(ctx, sumHash, objHash, obj, err, hashType)
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return
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}
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c.wg.Add(1)
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c.tokens <- struct{}{} // put a token to limit concurrency
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go func() {
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var (
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objHash string
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err error
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in io.ReadCloser
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)
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|
defer func() {
|
|
c.matchSum(ctx, sumHash, objHash, obj, err, hashType)
|
|
<-c.tokens // get the token back to free up a slot
|
|
c.wg.Done()
|
|
}()
|
|
if in, err = Open(ctx, obj); err != nil {
|
|
return
|
|
}
|
|
tr := accounting.Stats(ctx).NewTransfer(obj)
|
|
in = tr.Account(ctx, in).WithBuffer() // account and buffer the transfer
|
|
defer func() {
|
|
tr.Done(ctx, nil) // will close the stream
|
|
}()
|
|
hashVals, err2 := hash.StreamTypes(in, hash.NewHashSet(hashType))
|
|
if err2 != nil {
|
|
err = err2 // pass to matchSum
|
|
return
|
|
}
|
|
objHash = hashVals[hashType]
|
|
}()
|
|
}
|
|
|
|
// matchSum sums up the results of hashsum matching for an object
|
|
func (c *checkMarch) matchSum(ctx context.Context, sumHash, objHash string, obj fs.Object, err error, hashType hash.Type) {
|
|
switch {
|
|
case err != nil:
|
|
_ = fs.CountError(err)
|
|
fs.Errorf(obj, "Failed to calculate hash: %v", err)
|
|
c.report(obj, c.opt.Error, '!')
|
|
case sumHash == "":
|
|
err = errors.New("duplicate file")
|
|
_ = fs.CountError(err)
|
|
fs.Errorf(obj, "%v", err)
|
|
c.report(obj, c.opt.Error, '!')
|
|
case objHash == "":
|
|
fs.Debugf(nil, "%v = %s (sum)", hashType, sumHash)
|
|
fs.Debugf(obj, "%v - could not check hash (%v)", hashType, c.opt.Fdst)
|
|
c.noHashes.Add(1)
|
|
c.matches.Add(1)
|
|
c.report(obj, c.opt.Match, '=')
|
|
case objHash == sumHash:
|
|
fs.Debugf(obj, "%v = %s OK", hashType, sumHash)
|
|
c.matches.Add(1)
|
|
c.report(obj, c.opt.Match, '=')
|
|
default:
|
|
err = errors.New("files differ")
|
|
_ = fs.CountError(err)
|
|
fs.Debugf(nil, "%v = %s (sum)", hashType, sumHash)
|
|
fs.Debugf(obj, "%v = %s (%v)", hashType, objHash, c.opt.Fdst)
|
|
fs.Errorf(obj, "%v", err)
|
|
c.differences.Add(1)
|
|
c.report(obj, c.opt.Differ, '*')
|
|
}
|
|
}
|
|
|
|
// HashSums represents a parsed SUM file
|
|
type HashSums map[string]string
|
|
|
|
// ParseSumFile parses a hash SUM file and returns hashes as a map
|
|
func ParseSumFile(ctx context.Context, sumFile fs.Object) (HashSums, error) {
|
|
rd, err := Open(ctx, sumFile)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
parser := bufio.NewReader(rd)
|
|
|
|
const maxWarn = 3
|
|
numWarn := 0
|
|
|
|
re := regexp.MustCompile(`^([^ ]+) [ *](.+)$`)
|
|
hashes := HashSums{}
|
|
for lineNo := 0; true; lineNo++ {
|
|
lineBytes, _, err := parser.ReadLine()
|
|
if err == io.EOF {
|
|
break
|
|
}
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
line := string(lineBytes)
|
|
if line == "" {
|
|
continue
|
|
}
|
|
|
|
fields := re.FindStringSubmatch(ApplyTransforms(ctx, line))
|
|
if fields == nil {
|
|
numWarn++
|
|
if numWarn <= maxWarn {
|
|
fs.Logf(sumFile, "improperly formatted checksum line %d", lineNo)
|
|
}
|
|
continue
|
|
}
|
|
|
|
sum, file := fields[1], fields[2]
|
|
if hashes[file] != "" {
|
|
numWarn++
|
|
if numWarn <= maxWarn {
|
|
fs.Logf(sumFile, "duplicate file on checksum line %d", lineNo)
|
|
}
|
|
continue
|
|
}
|
|
|
|
// We've standardised on lower case checksums in rclone internals.
|
|
hashes[file] = strings.ToLower(sum)
|
|
}
|
|
|
|
if numWarn > maxWarn {
|
|
fs.Logf(sumFile, "%d warning(s) suppressed...", numWarn-maxWarn)
|
|
}
|
|
if err = rd.Close(); err != nil {
|
|
return nil, err
|
|
}
|
|
return hashes, nil
|
|
}
|