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lib/model: Don't fail on temporary chmod (fixes #8355, ref #8235) (#8356)

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Simon Frei 2022-05-22 13:52:40 +02:00 committed by GitHub
parent 5495d0f8ab
commit e3078cc531
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1 changed files with 24 additions and 17 deletions
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41
lib/model/util.go
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@ -116,28 +116,35 @@ func inWritableDir(fn func(string) error, targetFs fs.Filesystem, path string, i
}
const permBits = fs.ModePerm | fs.ModeSetuid | fs.ModeSetgid | fs.ModeSticky
var parentErr error
if mode := info.Mode() & permBits; mode&0200 == 0 {
// A non-writeable directory (for this user; we assume that's the
// relevant part). Temporarily change the mode so we can delete the
// file or directory inside it.
if err := targetFs.Chmod(dir, mode|0700); err != nil {
return err
}
// Chmod succeeded, we should change the permissions back on the way
// out. If we fail we log the error as we have irrevocably messed up
// at this point. :( (The operation we were called to wrap has
// succeeded or failed on its own so returning an error to the
// caller is inappropriate.)
defer func() {
if err := targetFs.Chmod(dir, mode); err != nil && !fs.IsNotExist(err) {
logFn := l.Warnln
if ignorePerms {
logFn = l.Debugln
parentErr = targetFs.Chmod(dir, mode|0700)
if parentErr != nil {
l.Debugf("Failed to make parent directory writable: %v", parentErr)
} else {
// Chmod succeeded, we should change the permissions back on the way
// out. If we fail we log the error as we have irrevocably messed up
// at this point. :( (The operation we were called to wrap has
// succeeded or failed on its own so returning an error to the
// caller is inappropriate.)
defer func() {
if err := targetFs.Chmod(dir, mode); err != nil && !fs.IsNotExist(err) {
logFn := l.Warnln
if ignorePerms {
logFn = l.Debugln
}
logFn("Failed to restore directory permissions after gaining write access:", err)
}
logFn("Failed to restore directory permissions after gaining write access:", err)
}
}()
}()
}
}
return fn(path)
err = fn(path)
if fs.IsPermission(err) && parentErr != nil {
err = fmt.Errorf("error after failing to make parent directory writable: %w", err)
}
return err
}