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local: new flag --local-zero-size-links to fix sync on some virtual filesystems 

Assume the Stat size of links is zero (and read them instead)

On some virtual filesystems (such ash LucidLink), reading a link size via a
Stat call always returns 0.
However, on unix it reads as the length of the text in the link. This may
cause errors like this when syncing:

    Failed to copy: corrupted on transfer: sizes differ 0 vs 13

Setting this flag causes rclone to read the link and use that as the size of
the link instead of 0 which in most cases fixes the problem.

Fixes #4950

Signed-off-by: Riccardo Iaconelli <riccardo@kde.org>
This commit is contained in:
Riccardo Iaconelli 2021-01-25 22:25:40 +01:00 committed by Nick Craig-Wood
parent 6156f90601
commit df4e6079f1
1 changed files with 17 additions and 1 deletions
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18
backend/local/local.go
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@ -70,6 +70,20 @@ points, as you explicitly acknowledge that they should be skipped.`,
Default: false,
NoPrefix: true,
Advanced: true,
}, {
Name: "zero_size_links",
Help: `Assume the Stat size of links is zero (and read them instead)
On some virtual filesystems (such ash LucidLink), reading a link size via a Stat call always returns 0.
However, on unix it reads as the length of the text in the link. This may cause errors like this when
syncing:
Failed to copy: corrupted on transfer: sizes differ 0 vs 13
Setting this flag causes rclone to read the link and use that as the size of the link
instead of 0 which in most cases fixes the problem.`,
Default: false,
Advanced: true,
}, {
Name: "no_unicode_normalization",
Help: `Don't apply unicode normalization to paths and filenames (Deprecated)
@ -170,6 +184,7 @@ type Options struct {
FollowSymlinks bool `config:"copy_links"`
TranslateSymlinks bool `config:"links"`
SkipSymlinks bool `config:"skip_links"`
ZeroSizeLinks bool `config:"zero_size_links"`
NoUTFNorm bool `config:"no_unicode_normalization"`
NoCheckUpdated bool `config:"no_check_updated"`
NoUNC bool `config:"nounc"`
@ -1232,7 +1247,8 @@ func (o *Object) setMetadata(info os.FileInfo) {
o.mode = info.Mode()
o.fs.objectMetaMu.Unlock()
// On Windows links read as 0 size so set the correct size here
if runtime.GOOS == "windows" && o.translatedLink {
// Optionally, users can turn this feature on with the zero_size_links flag
if (runtime.GOOS == "windows" || o.fs.opt.ZeroSizeLinks) && o.translatedLink {
linkdst, err := os.Readlink(o.path)
if err != nil {
fs.Errorf(o, "Failed to read link size: %v", err)