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// -*- Mode: Go; indent-tabs-mode: t -*-
/*
* Copyright (C) 2019-2020 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 snapdtool
import (
"bufio"
"fmt"
"io"
"os"
"path/filepath"
"strings"
)
// SnapdVersionFromInfoFile returns the snapd version read from the info file in
// the given dir, as well as any other key/value pairs/flags in the file.
// See ParseInfoFile for more format details.
func SnapdVersionFromInfoFile(dir string) (version string, flags map[string]string, err error) {
infoPath := filepath.Join(dir, "info")
f, err := os.Open(infoPath)
if err != nil {
return "", nil, fmt.Errorf("cannot open snapd info file %q: %s", infoPath, err)
}
defer f.Close()
return ParseInfoFile(f, fmt.Sprintf("%q", infoPath))
}
// ParseInfoFile parses the "info" file provided via an io.Reader. It returns
// the snapd version read from the info file, as well as any other key/value
// pairs/flags in the file.
// whence is used to construct error messages as "... info file %s".
// The format of the "info" file are lines with "KEY=VALUE" with the typical key
// being just VERSION. The file is produced by mkversion.sh and normally
// installed along snapd binary in /usr/lib/snapd.
// Other typical keys in this file include SNAPD_APPARMOR_REEXEC, which
// indicates whether or not the snapd-apparmor binary installed via the
// traditional linux package of snapd supports re-exec into the version in the
// snapd or core snaps.
func ParseInfoFile(f io.Reader, whence string) (version string, flags map[string]string, err error) {
flags = map[string]string{}
scanner := bufio.NewScanner(f)
for scanner.Scan() {
line := scanner.Text()
if strings.HasPrefix(line, "VERSION=") {
version = strings.TrimPrefix(line, "VERSION=")
} else {
keyVal := strings.SplitN(line, "=", 2)
if len(keyVal) != 2 {
// potentially malformed line, just skip it
continue
}
flags[keyVal[0]] = keyVal[1]
}
}
if err := scanner.Err(); err != nil {
return "", nil, fmt.Errorf("error reading snapd info file %s: %v", whence, err)
}
if version == "" {
return "", nil, fmt.Errorf("cannot find version in snapd info file %s", whence)
}
return version, flags, nil
}
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