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alpinerelease.go
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alpinerelease.go
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// Copyright 2017 clair authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// Package alpinerelease implements a featurens.Detector for Alpine Linux based
// container image layers.
package alpinerelease
import (
"bufio"
"bytes"
"regexp"
"strings"
"github.com/coreos/clair/database"
"github.com/coreos/clair/ext/featurens"
"github.com/coreos/clair/ext/versionfmt/dpkg"
"github.com/coreos/clair/pkg/tarutil"
)
const (
osName = "alpine"
alpineReleasePath = "etc/alpine-release"
)
var versionRegexp = regexp.MustCompile(`^(\d)+\.(\d)+\.(\d)+$`)
func init() {
featurens.RegisterDetector("alpine-release", &detector{})
}
type detector struct{}
func (d detector) Detect(files tarutil.FilesMap) (*database.Namespace, error) {
file, exists := files[alpineReleasePath]
if exists {
scanner := bufio.NewScanner(bytes.NewBuffer(file))
for scanner.Scan() {
line := scanner.Text()
match := versionRegexp.FindStringSubmatch(line)
if len(match) > 0 {
versionNumbers := strings.Split(match[0], ".")
return &database.Namespace{
Name: osName + ":" + "v" + versionNumbers[0] + "." + versionNumbers[1],
VersionFormat: dpkg.ParserName,
}, nil
}
}
}
return nil, nil
}
func (d detector) RequiredFilenames() []string {
return []string{alpineReleasePath}
}