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107 lines
2.7 KiB
107 lines
2.7 KiB
// 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 osrelease implements a featurens.Detector for container image
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// layers containing an os-release file.
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//
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// This detector is typically useful for detecting Debian or Ubuntu.
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package osrelease
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import (
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"bufio"
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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/ext/versionfmt/rpm"
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"github.com/coreos/clair/pkg/tarutil"
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)
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var (
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osReleaseOSRegexp = regexp.MustCompile(`^ID=(.*)`)
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osReleaseVersionRegexp = regexp.MustCompile(`^VERSION_ID=(.*)`)
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filenames = []string{"etc/os-release", "usr/lib/os-release"}
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// blacklistFilenames are files that should exclude this detector.
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blacklistFilenames = []string{
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"etc/oracle-release",
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"etc/redhat-release",
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"usr/lib/centos-release",
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}
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)
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type detector struct{}
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func init() {
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featurens.RegisterDetector("os-release", "1.0", &detector{})
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}
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func (d detector) Detect(files tarutil.FilesMap) (*database.Namespace, error) {
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var OS, version string
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for _, filePath := range blacklistFilenames {
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if _, hasFile := files[filePath]; hasFile {
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return nil, nil
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}
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}
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for _, filePath := range filenames {
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f, hasFile := files[filePath]
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if !hasFile {
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continue
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}
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scanner := bufio.NewScanner(strings.NewReader(string(f)))
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for scanner.Scan() {
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line := scanner.Text()
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r := osReleaseOSRegexp.FindStringSubmatch(line)
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if len(r) == 2 {
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OS = strings.Replace(strings.ToLower(r[1]), "\"", "", -1)
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}
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r = osReleaseVersionRegexp.FindStringSubmatch(line)
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if len(r) == 2 {
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version = strings.Replace(strings.ToLower(r[1]), "\"", "", -1)
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}
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}
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}
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// Determine the VersionFormat.
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var versionFormat string
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switch OS {
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case "debian", "ubuntu":
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versionFormat = dpkg.ParserName
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case "centos", "rhel", "fedora", "amzn", "ol", "oracle", "opensuse", "sles":
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versionFormat = rpm.ParserName
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default:
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return nil, nil
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}
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if OS != "" && version != "" {
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return &database.Namespace{
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Name: OS + ":" + version,
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VersionFormat: versionFormat,
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}, nil
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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{"^(etc|usr/lib)/os-release"}
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}
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