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local: fix update of hidden files on Windows - fixes #3839

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This commit is contained in:
Nick Craig-Wood 2020-01-04 18:02:32 +00:00
parent 1af4bb0c84
commit 540fd3f173
1 changed files with 11 additions and 1 deletions
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12
backend/local/local.go
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@ -956,7 +956,17 @@ func (o *Object) Update(ctx context.Context, in io.Reader, src fs.ObjectInfo, op
if !o.translatedLink {
f, err := file.OpenFile(o.path, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0666)
if err != nil {
return err
if runtime.GOOS == "windows" && os.IsPermission(err) {
// If permission denied on Windows might be trying to update a
// hidden file, in which case try opening without CREATE
// See: https://stackoverflow.com/questions/13215716/ioerror-errno-13-permission-denied-when-trying-to-open-hidden-file-in-w-mod
f, err = file.OpenFile(o.path, os.O_WRONLY|os.O_TRUNC, 0666)
if err != nil {
return err
}
} else {
return err
}
}
// Pre-allocate the file for performance reasons
err = preAllocate(src.Size(), f)