Beispiel #1
0
func execSend(path string, parent string, diff io.Writer) (retErr error) {
	defer func() {
		protolog.Debug(&Send{path, parent, errorToString(retErr)})
	}()
	if parent == "" {
		return executil.RunStdout(diff, "btrfs", "send", path)
	}
	return executil.RunStdout(diff, "btrfs", "send", "-p", parent, path)
}
Beispiel #2
0
func execSubvolumeFindNew(commit string, fromCommit string, out io.Writer) (retErr error) {
	defer func() {
		protolog.Debug(&SubvolumeFindNew{commit, fromCommit, errorToString(retErr)})
	}()
	if fromCommit == "" {
		return executil.RunStdout(out, "btrfs", "subvolume", "find-new", commit, "0")
	}
	transid, err := execTransID(fromCommit)
	if err != nil {
		return err
	}
	return executil.RunStdout(out, "btrfs", "subvolume", "find-new", commit, transid)
}
Beispiel #3
0
func execTransID(path string) (result string, retErr error) {
	defer func() {
		protolog.Debug(&TransID{path, result, errorToString(retErr)})
	}()
	//  "9223372036854775810" == 2 ** 63 we use a very big number there so that
	//  we get the transid of the from path. According to the internet this is
	//  the nicest way to get it from btrfs.
	var buffer bytes.Buffer
	if err := executil.RunStdout(&buffer, "btrfs", "subvolume", "find-new", path, "9223372036854775808"); err != nil {
		return "", err
	}
	scanner := bufio.NewScanner(&buffer)
	for scanner.Scan() {
		// scanner.Text() looks like this:
		// transid marker was 907
		// 0       1      2   3
		tokens := strings.Split(scanner.Text(), " ")
		if len(tokens) != 4 {
			return "", fmt.Errorf("pachyderm: failed to parse find-new output")
		}
		return tokens[3], nil
	}
	if scanner.Err() != nil {
		return "", scanner.Err()
	}
	return "", fmt.Errorf("pachyderm: empty output from find-new")
}
Beispiel #4
0
func execSubvolumeList(path string, fromCommit string, ascending bool, out io.Writer) (retErr error) {
	defer func() {
		protolog.Debug(&SubvolumeList{path, fromCommit, ascending, errorToString(retErr)})
	}()
	var sort string
	if ascending {
		sort = "+ogen"
	} else {
		sort = "-ogen"
	}

	if fromCommit == "" {
		return executil.RunStdout(out, "btrfs", "subvolume", "list", "-a", "--sort", sort, path)
	}
	transid, err := execTransID(fromCommit)
	if err != nil {
		return err
	}
	return executil.RunStdout(out, "btrfs", "subvolume", "list", "-aC", "+"+transid, "--sort", sort, path)
}