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local: fix /path/to/file.rclonelink when -l/--links is in use

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Before this change using /path/to/file.rclonelink would not find the
file when using -l/--links.

This fixes the problem by doing another stat call if the file wasn't
found without the suffix if -l/--links is in use.

It will also give an error if you refer to a symlink without its
suffix which will not work because the limit to a single file
filtering will be using the file name without the .rclonelink suffix.

    need ".rclonelink" suffix to refer to symlink when using -l/--links

Before this change it would use the symlink as a directory which then
would fail when listed.

See: #6855
This commit is contained in:
Nick Craig-Wood 2023-04-03 17:14:04 +01:00
parent 15a3ec8fa1
commit 64cf9ac911
2 changed files with 27 additions and 1 deletions
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14
backend/local/local.go
View File

@ -266,7 +266,10 @@ type Object struct {
// ------------------------------------------------------------
var errLinksAndCopyLinks = errors.New("can't use -l/--links with -L/--copy-links")
var (
errLinksAndCopyLinks = errors.New("can't use -l/--links with -L/--copy-links")
errLinksNeedsSuffix = errors.New("need \"" + linkSuffix + "\" suffix to refer to symlink when using -l/--links")
)
// NewFs constructs an Fs from the path
func NewFs(ctx context.Context, name, root string, m configmap.Mapper) (fs.Fs, error) {
@ -310,7 +313,16 @@ func NewFs(ctx context.Context, name, root string, m configmap.Mapper) (fs.Fs, e
if err == nil {
f.dev = readDevice(fi, f.opt.OneFileSystem)
}
// Check to see if this is a .rclonelink if not found
hasLinkSuffix := strings.HasSuffix(f.root, linkSuffix)
if hasLinkSuffix && opt.TranslateSymlinks && os.IsNotExist(err) {
fi, err = f.lstat(strings.TrimSuffix(f.root, linkSuffix))
}
if err == nil && f.isRegular(fi.Mode()) {
// Handle the odd case, that a symlink was specified by name without the link suffix
if !hasLinkSuffix && opt.TranslateSymlinks && fi.Mode()&os.ModeSymlink != 0 {
return nil, errLinksNeedsSuffix
}
// It is a file, so use the parent as the root
f.root = filepath.Dir(f.root)
// return an error with an fs which points to the parent

14
backend/local/local_internal_test.go
View File

@ -146,6 +146,20 @@ func TestSymlink(t *testing.T) {
_, err = r.Flocal.NewObject(ctx, "symlink2.txt")
require.Equal(t, fs.ErrorObjectNotFound, err)
// Check that NewFs works with the suffixed version and --links
f2, err := NewFs(ctx, "local", filepath.Join(dir, "symlink2.txt"+linkSuffix), configmap.Simple{
"links": "true",
})
require.Equal(t, fs.ErrorIsFile, err)
require.Equal(t, dir, f2.(*Fs).root)
// Check that NewFs doesn't see the non suffixed version with --links
f2, err = NewFs(ctx, "local", filepath.Join(dir, "symlink2.txt"), configmap.Simple{
"links": "true",
})
require.Equal(t, errLinksNeedsSuffix, err)
require.Nil(t, f2)
// Check reading the object
in, err := o.Open(ctx)
require.NoError(t, err)