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