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labels.go
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labels.go
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// -*- Mode: Go; indent-tabs-mode: t -*-
/*
* Copyright (C) 2020 Canonical Ltd
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 3 as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
package disks
import (
"bytes"
"fmt"
"strings"
"unicode/utf8"
)
// BlkIDEncodeLabel encodes a name for use as a partition or filesystem
// label symlink by udev. The result matches the output of blkid_encode_string()
// from libblkid.
func BlkIDEncodeLabel(in string) string {
const allowed = `#+-.:=@_abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789`
buf := &bytes.Buffer{}
for _, r := range in {
switch {
case utf8.RuneLen(r) > 1:
buf.WriteRune(r)
case !strings.ContainsRune(allowed, r):
fmt.Fprintf(buf, `\x%x`, r)
default:
buf.WriteRune(r)
}
}
return buf.String()
}