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lib/scanner: Save one stat call per file (#6715)

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Simon Frei 2020-06-08 08:14:50 +02:00 committed by GitHub
parent 6b4fe5c063
commit 0b65a616ba
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GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 14 additions and 16 deletions
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30
lib/scanner/walk.go
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@ -265,7 +265,7 @@ func (w *walker) walkAndHashFiles(ctx context.Context, toHashChan chan<- protoco
if ignoredParent == "" {
// parent isn't ignored, nothing special
return w.handleItem(ctx, path, toHashChan, finishedChan, skip)
return w.handleItem(ctx, path, info, toHashChan, finishedChan, skip)
}
// Part of current path below the ignored (potential) parent
@ -274,17 +274,22 @@ func (w *walker) walkAndHashFiles(ctx context.Context, toHashChan chan<- protoco
// ignored path isn't actually a parent of the current path
if rel == path {
ignoredParent = ""
return w.handleItem(ctx, path, toHashChan, finishedChan, skip)
return w.handleItem(ctx, path, info, toHashChan, finishedChan, skip)
}
// The previously ignored parent directories of the current, not
// ignored path need to be handled as well.
if err = w.handleItem(ctx, ignoredParent, toHashChan, finishedChan, skip); err != nil {
return err
}
for _, name := range strings.Split(rel, string(fs.PathSeparator)) {
// Prepend an empty string to handle ignoredParent without anything
// appended in the first iteration.
for _, name := range append([]string{""}, strings.Split(rel, string(fs.PathSeparator))...) {
ignoredParent = filepath.Join(ignoredParent, name)
if err = w.handleItem(ctx, ignoredParent, toHashChan, finishedChan, skip); err != nil {
info, err = w.Filesystem.Lstat(ignoredParent)
// An error here would be weird as we've already gotten to this point, but act on it nonetheless
if err != nil {
w.handleError(ctx, "scan", ignoredParent, err, finishedChan)
return skip
}
if err = w.handleItem(ctx, ignoredParent, info, toHashChan, finishedChan, skip); err != nil {
return err
}
}
@ -294,16 +299,9 @@ func (w *walker) walkAndHashFiles(ctx context.Context, toHashChan chan<- protoco
}
}
func (w *walker) handleItem(ctx context.Context, path string, toHashChan chan<- protocol.FileInfo, finishedChan chan<- ScanResult, skip error) error {
info, err := w.Filesystem.Lstat(path)
// An error here would be weird as we've already gotten to this point, but act on it nonetheless
if err != nil {
w.handleError(ctx, "scan", path, err, finishedChan)
return skip
}
func (w *walker) handleItem(ctx context.Context, path string, info fs.FileInfo, toHashChan chan<- protocol.FileInfo, finishedChan chan<- ScanResult, skip error) error {
oldPath := path
path, err = w.normalizePath(path, info)
path, err := w.normalizePath(path, info)
if err != nil {
w.handleError(ctx, "normalizing path", oldPath, err, finishedChan)
return skip