/
core_version.go
56 lines (46 loc) · 1.45 KB
/
core_version.go
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// -*- Mode: Go; indent-tabs-mode: t -*-
/*
* Copyright (C) 2023 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 naming
import (
"fmt"
"regexp"
"strconv"
)
var (
coreNameFormat = regexp.MustCompile("^core(?P<version>[0-9]*)(?:-.*)?$")
)
// CoreVersion extract the version component of the core snap name
// Most core snap names are of the form coreXX where XX is a number.
// CoreVersion returns that number. In case of "core", it returns
// 16.
func CoreVersion(base string) (int, error) {
foundCore := coreNameFormat.FindStringSubmatch(base)
if foundCore == nil {
return 0, fmt.Errorf("not a core base")
}
coreVersionStr := foundCore[coreNameFormat.SubexpIndex("version")]
if coreVersionStr == "" {
return 16, nil
}
v, err := strconv.Atoi(coreVersionStr)
if err != nil {
// Unreachable
return 0, fmt.Errorf("Unexpected error converting %s to version: %v", base, err)
}
return v, nil
}