mirror of https://github.com/linka-cloud/d2vm.git
117 lines
2.7 KiB
Go
117 lines
2.7 KiB
Go
// Copyright 2022 Linka Cloud All rights reserved.
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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 docker2vm
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import (
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"context"
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"fmt"
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"os"
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"path/filepath"
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"strings"
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"text/template"
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"github.com/joho/godotenv"
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"github.com/sirupsen/logrus"
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"go.linka.cloud/d2vm/pkg/docker"
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)
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const (
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ReleaseUbuntu Release = "ubuntu"
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ReleaseDebian Release = "debian"
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ReleaseAlpine Release = "alpine"
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ReleaseCentOS Release = "centos"
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)
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type Release string
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func (r Release) Supported() bool {
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switch r {
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case ReleaseUbuntu:
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return true
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case ReleaseDebian:
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return true
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case ReleaseAlpine:
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return true
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case ReleaseCentOS:
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return true
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default:
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return false
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}
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}
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type OSRelease struct {
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ID Release
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Name string
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VersionID string
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Version string
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VersionCodeName string
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}
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func ParseOSRelease(s string) (OSRelease, error) {
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env, err := godotenv.Parse(strings.NewReader(s))
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if err != nil {
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return OSRelease{}, err
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}
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o := OSRelease{
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ID: Release(strings.ToLower(env["ID"])),
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Name: env["NAME"],
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Version: env["VERSION"],
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VersionID: env["VERSION_ID"],
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VersionCodeName: env["VERSION_CODENAME"],
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}
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return o, nil
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}
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const (
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osReleaseDockerfile = `
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FROM {{ . }}
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ENTRYPOINT [""]
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CMD ["/bin/cat", "/etc/os-release"]
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`
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)
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var (
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osReleaseDockerfileTemplate = template.Must(template.New("osrelease.Dockerfile").Parse(osReleaseDockerfile))
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)
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func FetchDockerImageOSRelease(ctx context.Context, img string, tmpPath string) (OSRelease, error) {
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d := filepath.Join(tmpPath, "osrelase.Dockerfile")
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f, err := os.Create(d)
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if err != nil {
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return OSRelease{}, err
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}
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defer f.Close()
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if err := osReleaseDockerfileTemplate.Execute(f, img); err != nil {
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return OSRelease{}, err
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}
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imgTag := fmt.Sprintf("os-release-%s", img)
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if err := docker.Cmd(ctx, "image", "build", "-t", imgTag, "-f", d, tmpPath); err != nil {
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return OSRelease{}, err
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}
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defer func() {
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if err := docker.Cmd(ctx, "image", "rm", imgTag); err != nil {
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logrus.WithError(err).Error("failed to cleanup OSRelease Docker Image")
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}
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}()
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o, _, err := docker.CmdOut(ctx, "run", "--rm", "-i", imgTag)
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if err != nil {
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return OSRelease{}, err
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}
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return ParseOSRelease(o)
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}
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