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improve readlink handling

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Signed-off-by: Nicola Murino <nicola.murino@gmail.com>
This commit is contained in:
Nicola Murino
2022-04-27 19:01:42 +02:00
parent 80c8486d24
commit c7073f90cb
10 changed files with 180 additions and 56 deletions
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12
vfs/osfs.go
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@@ -143,11 +143,17 @@ func (*OsFs) Symlink(source, target string) error {
// Readlink returns the destination of the named symbolic link
// as absolute virtual path
func (fs *OsFs) Readlink(name string) (string, error) {
p, err := os.Readlink(name)
// we don't have to follow multiple links:
// https://github.com/openssh/openssh-portable/blob/7bf2eb958fbb551e7d61e75c176bb3200383285d/sftp-server.c#L1329
resolved, err := os.Readlink(name)
if err != nil {
return p, err
return "", err
}
return fs.GetRelativePath(p), err
resolved = filepath.Clean(resolved)
if !filepath.IsAbs(resolved) {
resolved = filepath.Join(filepath.Dir(name), resolved)
}
return fs.GetRelativePath(resolved), nil
}
// Chown changes the numeric uid and gid of the named file.