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build and convert implementations

Browse Source 
centos: WIP

Signed-off-by: Adphi <philippe.adrien.nousse@gmail.com>
This commit is contained in:
Adphi 2022-04-19 14:01:08 +02:00
commit c2f6e4ae5d
Signed by: adphi
GPG Key ID: 46BE4062DB2397FF
27 changed files with 1559 additions and 0 deletions
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.idea
tests
disk*
qemu.sh
*.qcow2

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.idea
tests
disk*.qcow2

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FROM golang as builder
WORKDIR /d2vm
COPY go.mod go.mod
COPY go.sum go.sum
RUN go mod download
COPY . .
RUN go build -o d2vm ./cmd/d2vm
FROM ubuntu
RUN apt-get update && \
DEBIAN_FRONTEND=noninteractive apt-get -y install --no-install-recommends \
linux-image-virtual \
util-linux \
kpartx \
e2fsprogs \
xfsprogs \
mount \
tar \
extlinux \
uuid-runtime \
qemu-utils
COPY --from=docker:dind /usr/local/bin/docker /usr/local/bin/
COPY --from=builder /d2vm/d2vm /usr/local/bin/

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Apache License
Version 2.0, January 2004
http://www.apache.org/licenses/
TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
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"License" shall mean the terms and conditions for use, reproduction,
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whether in tort (including negligence), contract, or otherwise,
unless required by applicable law (such as deliberate and grossly
negligent acts) or agreed to in writing, shall any Contributor be
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END OF TERMS AND CONDITIONS
APPENDIX: How to apply the Apache License to your work.
To apply the Apache License to your work, attach the following
boilerplate notice, with the fields enclosed by brackets "[]"
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Copyright 2022 The Linka Cloud Team
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.

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# Copyright 2021 Linka Cloud All rights reserved.
#
# 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.
MODULE = go.linka.cloud/d2vm
REPOSITORY = linkacloud
VERSION_SUFFIX = $(shell git diff --quiet || echo "-dev")
VERSION = $(shell git describe --tags --exact-match 2> /dev/null || echo "`git describe --tags $$(git rev-list --tags --max-count=1) 2> /dev/null || echo v0.0.0`-`git rev-parse --short HEAD`")$(VERSION_SUFFIX)
show-version:
@echo $(VERSION)
DOCKER_IMAGE := linkacloud/d2vm
docker-push:
@docker image push -a $(DOCKER_IMAGE)
docker-build:
@docker image build -t $(DOCKER_IMAGE):$(VERSION) -t $(DOCKER_IMAGE):latest .
docker-run:
@docker run --rm -i -t \
--privileged \
-v /var/run/docker.sock:/var/run/docker.sock \
-v $(PWD):/build \
-w /build \
$(DOCKER_IMAGE) bash

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# d2vm
*Build virtual machine image from Docker images*
**Status**: *alpha*
## Supported Environments:
**Only Linux is supported.**
If you want to run it on OSX or Windows (untested) you can use Docker for it:
```bash
docker run --rm -i -t \
--privileged \
-v /var/run/docker.sock:/var/run/docker.sock \
-v $(pwd):/build \
-w /build \
linkacloud/d2vm bash
```

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// Copyright 2022 Linka Cloud All rights reserved.
//
// 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 docker2vm
import (
"bytes"
"context"
"fmt"
"os"
"path/filepath"
"strings"
"github.com/sirupsen/logrus"
"go.uber.org/multierr"
"go.linka.cloud/d2vm/pkg/exec"
)
const (
hosts = `127.0.0.1 localhost
# The following lines are desirable for IPv6 capable hosts
::1 ip6-localhost ip6-loopback
fe00::0 ip6-localnet
ff00::0 ip6-mcastprefix
ff02::1 ip6-allnodes
ff02::2 ip6-allrouters
ff02::3 ip6-allhosts
`
syslinuxCfgUbuntu = `DEFAULT linux
SAY Now booting the kernel from SYSLINUX...
LABEL linux
KERNEL /boot/vmlinuz
APPEND ro root=UUID=%s initrd=/boot/initrd.img net.ifnames=0 console=tty0 console=ttyS0,115200n8
`
syslinuxCfgDebian = `DEFAULT linux
SAY Now booting the kernel from SYSLINUX...
LABEL linux
KERNEL /vmlinuz
APPEND ro root=UUID=%s initrd=/initrd.img net.ifnames=0 console=tty0 console=ttyS0,115200n8
`
syslinuxCfgAlpine = `DEFAULT linux
SAY Now booting the kernel from SYSLINUX...
LABEL linux
KERNEL /boot/vmlinuz-virt
APPEND ro root=UUID=%s rootfstype=ext4 initrd=/boot/initramfs-virt console=ttyS0,115200
`
syslinuxCfgCentOS = `DEFAULT linux
SAY Now booting the kernel from SYSLINUX...
LABEL linux
KERNEL /boot/vmlinuz
APPEND ro root=UUID=%s initrd=/boot/initrd.img net.ifnames=0 console=tty0 console=ttyS0,115200n8
`
)
var (
fdiskCmds = []string{"n", "p", "1", "", "", "a", "w"}
)
type builder struct {
osRelease OSRelease
src string
diskRaw string
diskQcow2 string
size int64
mntPoint string
loDevice string
loPart string
diskUUD string
}
func NewBuilder(workdir, src, disk string, size int64, osRelease OSRelease) (*builder, error) {
if size == 0 {
size = 1
}
if disk == "" {
disk = "disk0"
}
b := &builder{
osRelease: osRelease,
src: src,
diskRaw: filepath.Join(workdir, disk+".raw"),
diskQcow2: filepath.Join(workdir, disk+".qcow2"),
size: size,
mntPoint: filepath.Join(workdir, "/mnt"),
}
if err := os.MkdirAll(b.mntPoint, os.ModePerm); err != nil {
return nil, err
}
return b, nil
}
func (b *builder) Build(ctx context.Context) (err error) {
defer func() {
if err == nil {
return
}
logrus.WithError(err).Error("Build failed")
if err := b.unmountImg(context.Background()); err != nil {
logrus.WithError(err).Error("failed to unmount")
}
if err := b.cleanUp(context.Background()); err != nil {
logrus.WithError(err).Error("failed to cleanup")
}
}()
if err = b.cleanUp(ctx); err != nil {
return err
}
if err = b.makeImg(ctx); err != nil {
return err
}
if err = b.mountImg(ctx); err != nil {
return err
}
if err = b.copyRootFS(ctx); err != nil {
return err
}
if err = b.setupRootFS(ctx); err != nil {
return err
}
if err = b.installKernel(ctx); err != nil {
return err
}
if err = b.unmountImg(ctx); err != nil {
return err
}
if err = b.setupMBR(ctx); err != nil {
return err
}
if err = b.convert2Qcow2(ctx); err != nil {
return err
}
if err = b.cleanUp(ctx); err != nil {
return err
}
return nil
}
func (b *builder) cleanUp(ctx context.Context) error {
return os.RemoveAll(b.diskRaw)
}
func (b *builder) makeImg(ctx context.Context) error {
ctx, cancel := context.WithCancel(ctx)
defer cancel()
logrus.Infof("creating raw image")
if err := block(b.diskRaw, b.size); err != nil {
return err
}
c := exec.CommandContext(ctx, "fdisk", b.diskRaw)
var i bytes.Buffer
for _, v := range fdiskCmds {
if _, err := i.Write([]byte(v + "\n")); err != nil {
return err
}
}
var e bytes.Buffer
c.Stdin = &i
c.Stderr = &e
if err := c.Run(); err != nil {
return fmt.Errorf("%w: %s", err, e.String())
}
return nil
}
func (b *builder) mountImg(ctx context.Context) error {
logrus.Infof("mounting raw image")
o, _, err := exec.RunOut(ctx, "losetup", "--show", "-f", b.diskRaw)
if err != nil {
return err
}
b.loDevice = strings.TrimSuffix(o, "\n")
if err := exec.Run(ctx, "kpartx", "-a", b.loDevice); err != nil {
return err
}
b.loPart = fmt.Sprintf("/dev/mapper/%sp1", filepath.Base(b.loDevice))
logrus.Infof("creating raw image file system")
if err := exec.Run(ctx, "mkfs.ext4", b.loPart); err != nil {
return err
}
if err := exec.Run(ctx, "mount", b.loPart, b.mntPoint); err != nil {
return err
}
return nil
}
func (b *builder) unmountImg(ctx context.Context) error {
logrus.Infof("unmounting raw image")
var merr error
if err := exec.Run(ctx, "umount", b.mntPoint); err != nil {
merr = multierr.Append(merr, err)
}
if err := exec.Run(ctx, "kpartx", "-d", b.loDevice); err != nil {
merr = multierr.Append(merr, err)
}
if err := exec.Run(ctx, "losetup", "-d", b.loDevice); err != nil {
merr = multierr.Append(merr, err)
}
return merr
}
func (b *builder) copyRootFS(ctx context.Context) error {
logrus.Infof("copying rootfs to raw image")
if err := exec.Run(ctx, "tar", "-xvf", b.src, "-C", b.mntPoint); err != nil {
return err
}
return nil
}
func (b *builder) setupRootFS(ctx context.Context) error {
logrus.Infof("setting up rootfs")
o, _, err := exec.RunOut(ctx, "blkid", "-s", "UUID", "-o", "value", b.loPart)
if err != nil {
return err
}
b.diskUUD = strings.TrimSuffix(o, "\n")
fstab := fmt.Sprintf("UUID=%s / ext4 errors=remount-ro 0 1\n", b.diskUUD)
if err := b.chWriteFile("/etc/fstab", fstab, 0644); err != nil {
return err
}
if err := b.chWriteFile("/etc/resolv.conf", "nameserver 8.8.8.8", 0644); err != nil {
return err
}
if err := b.chWriteFile("/etc/hostname", "localhost", 0644); err != nil {
return err
}
if err := b.chWriteFile("/etc/hosts", hosts, 0644); err != nil {
return err
}
if err := os.RemoveAll("/ur/sbin/policy-rc.d"); err != nil {
return err
}
if err := os.RemoveAll(b.chPath("/.dockerenv")); err != nil {
return err
}
if b.osRelease.ID != ReleaseAlpine {
return nil
}
by, err := os.ReadFile(b.chPath("/etc/inittab"))
if err != nil {
return err
}
by = append(by, []byte("\n"+"ttyS0::respawn:/sbin/getty -L ttyS0 115200 vt100\n")...)
if err := b.chWriteFile("/etc/inittab", string(by), 0644); err != nil {
return err
}
if err := b.chWriteFile("/etc/network/interfaces", "", 0644); err != nil {
return err
}
return nil
}
func (b *builder) installKernel(ctx context.Context) error {
logrus.Infof("installing linux kernel")
if err := exec.Run(ctx, "extlinux", "--install", b.chPath("/boot")); err != nil {
return err
}
var sysconfig string
switch b.osRelease.ID {
case ReleaseUbuntu:
sysconfig = syslinuxCfgUbuntu
case ReleaseDebian:
sysconfig = syslinuxCfgDebian
case ReleaseAlpine:
sysconfig = syslinuxCfgAlpine
case ReleaseCentOS:
sysconfig = syslinuxCfgCentOS
default:
return fmt.Errorf("%s: distribution not supported", b.osRelease.ID)
}
if err := b.chWriteFile("/boot/syslinux.cfg", fmt.Sprintf(sysconfig, b.diskUUD), 0644); err != nil {
return err
}
return nil
}
func (b *builder) setupMBR(ctx context.Context) error {
logrus.Infof("writing MBR")
if err := exec.Run(ctx, "dd", "if=/usr/lib/EXTLINUX/mbr.bin", fmt.Sprintf("of=%s", b.diskRaw), "bs=440", "count=1", "conv=notrunc"); err != nil {
return err
}
return nil
}
func (b *builder) convert2Qcow2(ctx context.Context) error {
logrus.Infof("converting to QCOW2")
return exec.Run(ctx, "qemu-img", "convert", b.diskRaw, "-O", "qcow2", b.diskQcow2)
}
func (b *builder) chWriteFile(path string, content string, perm os.FileMode) error {
return os.WriteFile(b.chPath(path), []byte(content), perm)
}
func (b *builder) chPath(path string) string {
return fmt.Sprintf("%s%s", b.mntPoint, path)
}
func block(path string, size int64) error {
f, err := os.Create(path)
if err != nil {
return err
}
defer f.Close()
return f.Truncate(size)
}

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// Copyright 2022 Linka Cloud All rights reserved.
//
// 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 main
import (
"github.com/google/uuid"
"github.com/sirupsen/logrus"
"github.com/spf13/cobra"
"go.linka.cloud/d2vm"
"go.linka.cloud/d2vm/pkg/docker"
"go.linka.cloud/d2vm/pkg/exec"
)
var (
file = "Dockerfile"
tag = uuid.New().String()
buildCmd = &cobra.Command{
Use: "build [context directory]",
Short: "Build qcow2 vm image from Dockerfile",
Args: cobra.ExactArgs(1),
RunE: func(cmd *cobra.Command, args []string) error {
size, err := parseSize(size)
if err != nil {
return err
}
if debug {
exec.Run = exec.RunStdout
}
logrus.Infof("building docker image from %s", file)
if err := docker.Cmd(cmd.Context(), "build", "-t", tag, "-f", file, args[0]); err != nil {
return err
}
return docker2vm.Convert(cmd.Context(), tag, size, password, output)
},
}
)
func init() {
rootCmd.AddCommand(buildCmd)
buildCmd.Flags().StringVarP(&file, "file", "f", "Dockerfile", "Name of the Dockerfile (Default is 'PATH/Dockerfile')")
buildCmd.Flags().StringVarP(&tag, "tag", "t", tag, "Name and optionally a tag in the 'name:tag' format")
buildCmd.Flags().StringVarP(&output, "output", "o", output, "The output qcow2 image")
buildCmd.Flags().StringVarP(&password, "password", "p", "root", "Root user password")
buildCmd.Flags().StringVarP(&size, "size", "s", "1G", "The output image size")
buildCmd.Flags().BoolVarP(&debug, "debug", "d", false, "Enable Debug output")
buildCmd.Flags().BoolVar(&force, "force", false, "Override output qcow2 image")
}

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// Copyright 2022 Linka Cloud All rights reserved.
//
// 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 main
import (
"fmt"
"os"
"github.com/c2h5oh/datasize"
"github.com/sirupsen/logrus"
"github.com/spf13/cobra"
"go.linka.cloud/d2vm"
"go.linka.cloud/d2vm/pkg/docker"
"go.linka.cloud/d2vm/pkg/exec"
)
var (
convertCmd = &cobra.Command{
Use: "convert [docker image]",
Short: "Convert Docker image to qcow2 vm image",
Args: cobra.ExactArgs(1),
SilenceUsage: true,
RunE: func(cmd *cobra.Command, args []string) error {
img := args[0]
size, err := parseSize(size)
if err != nil {
return err
}
if _, err := os.Stat(output); err == nil || !os.IsNotExist(err) {
if !force {
return fmt.Errorf("%s already exists", output)
}
}
if debug {
exec.Run = exec.RunStdout
}
if _, err := os.Stat(output); err == nil || !os.IsNotExist(err) {
if !force {
return fmt.Errorf("%s already exists", output)
}
}
logrus.Infof("pulling image %s", img)
if err := docker.Cmd(cmd.Context(), "image", "pull", img); err != nil {
return err
}
return docker2vm.Convert(cmd.Context(), img, size, password, output)
},
}
)
func parseSize(s string) (int64, error) {
var v datasize.ByteSize
if err := v.UnmarshalText([]byte(s)); err != nil {
return 0, err
}
return int64(v), nil
}
func init() {
convertCmd.Flags().StringVarP(&output, "output", "o", output, "The output qcow2 image")
convertCmd.Flags().StringVarP(&password, "password", "p", "root", "The Root user password")
convertCmd.Flags().StringVarP(&size, "size", "s", "1G", "The output image size")
convertCmd.Flags().BoolVarP(&debug, "debug", "d", false, "Enable Debug output")
convertCmd.Flags().BoolVarP(&force, "force", "f", false, "Override output qcow2 image")
rootCmd.AddCommand(convertCmd)
}

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// Copyright 2022 Linka Cloud All rights reserved.
//
// 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 main
import (
"context"
"github.com/spf13/cobra"
)
var (
output = "disk0.qcow2"
size = "1G"
password = "root"
force = false
debug = false
rootCmd = &cobra.Command{
Use: "d2vm",
}
)
func main() {
ctx, cancel := context.WithCancel(context.Background())
defer cancel()
rootCmd.ExecuteContext(ctx)
}

115
convert.go Normal file
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// Copyright 2022 Linka Cloud All rights reserved.
//
// 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 docker2vm
import (
"context"
"fmt"
"io"
"os"
"path/filepath"
"github.com/google/uuid"
"github.com/sirupsen/logrus"
"go.linka.cloud/d2vm/pkg/docker"
)
func Convert(ctx context.Context, img string, size int64, password string, output string) error {
imgUUID := uuid.New().String()
tmpPath := filepath.Join(os.TempDir(), "d2vm", imgUUID)
if err := os.MkdirAll(tmpPath, os.ModePerm); err != nil {
return err
}
defer os.RemoveAll(tmpPath)
logrus.Infof("inspecting image %s", img)
r, err := FetchDockerImageOSRelease(ctx, img, tmpPath)
if err != nil {
return err
}
d, err := NewDockerfile(r, img, password)
if err != nil {
return err
}
logrus.Infof("docker image based on %s", d.Release.Name)
p := filepath.Join(tmpPath, docker.FormatImgName(img))
dir := filepath.Dir(p)
f, err := os.Create(p)
if err != nil {
return err
}
defer f.Close()
if err := d.Render(f); err != nil {
return err
}
logrus.Infof("building kernel enabled image")
if err := docker.Cmd(ctx, "image", "build", "-t", imgUUID, "-f", p, dir); err != nil {
return err
}
defer docker.Cmd(ctx, "image", "rm", imgUUID)
archive := imgUUID + ".tar"
archivePath := filepath.Join(tmpPath, archive)
logrus.Infof("creating root file system archive")
if err := docker.Cmd(ctx, "run", "-d", "--name", imgUUID, imgUUID); err != nil {
return err
}
if err := docker.Cmd(ctx, "export", "--output", archivePath, imgUUID); err != nil {
return err
}
if err := docker.Cmd(ctx, "rm", "-f", imgUUID); err != nil {
return err
}
logrus.Infof("creating vm image")
b, err := NewBuilder(tmpPath, archivePath, "", size, r)
if err != nil {
return err
}
if err := b.Build(ctx); err != nil {
return err
}
if err := os.RemoveAll(output); err != nil {
return err
}
if err := MoveFile(filepath.Join(tmpPath, "disk0.qcow2"), output); err != nil {
return err
}
return nil
}
func MoveFile(sourcePath, destPath string) error {
inputFile, err := os.Open(sourcePath)
if err != nil {
return fmt.Errorf("failed to open source file: %s", err)
}
outputFile, err := os.Create(destPath)
if err != nil {
inputFile.Close()
return fmt.Errorf("failed to open dest file: %s", err)
}
defer outputFile.Close()
_, err = io.Copy(outputFile, inputFile)
inputFile.Close()
if err != nil {
return fmt.Errorf("failed to write to output file: %s", err)
}
// The copy was successful, so now delete the original file
err = os.Remove(sourcePath)
if err != nil {
return fmt.Errorf("failed to remove original file: %s", err)
}
return nil
}

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// Copyright 2022 Linka Cloud All rights reserved.
//
// 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 docker2vm
import (
"io"
"text/template"
)
const (
dockerImageRun = `
#!/bin/sh
{{- range .Config.Env }}
export {{ . }}
{{- end }}
cd {{- if .Config.WorkingDir }}{{ .Config.WorkingDir }}{{- else }}/{{- end }}
{{ .Config.Entrypoint }} {{ .Config.Args }}
`
)
var (
dockerImageRunTemplate = template.Must(template.New("docker-run.sh").Parse(dockerImageRun))
)
type DockerImage struct {
Config struct {
Hostname string `json:"Hostname"`
Domainname string `json:"Domainname"`
User string `json:"User"`
AttachStdin bool `json:"AttachStdin"`
AttachStdout bool `json:"AttachStdout"`
AttachStderr bool `json:"AttachStderr"`
ExposedPorts struct {
Tcp struct {
} `json:"3000/tcp"`
} `json:"ExposedPorts"`
Tty bool `json:"Tty"`
OpenStdin bool `json:"OpenStdin"`
StdinOnce bool `json:"StdinOnce"`
Env []string `json:"Env"`
Cmd []string `json:"Cmd"`
Image string `json:"Image"`
Volumes interface{} `json:"Volumes"`
WorkingDir string `json:"WorkingDir"`
Entrypoint []string `json:"Entrypoint"`
OnBuild interface{} `json:"OnBuild"`
Labels interface{} `json:"Labels"`
} `json:"Config"`
Architecture string `json:"Architecture"`
Os string `json:"Os"`
Size int `json:"Size"`
VirtualSize int `json:"VirtualSize"`
}
func (i DockerImage) AsRunScript(w io.Writer) error {
return dockerImageRunTemplate.Execute(w, i)
}

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// Copyright 2022 Linka Cloud All rights reserved.
//
// 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 docker2vm
import (
_ "embed"
"fmt"
"io"
"text/template"
)
//go:embed templates/ubuntu.Dockerfile
var ubuntuDockerfile string
//go:embed templates/debian.Dockerfile
var debianDockerfile string
//go:embed templates/alpine.Dockerfile
var alpineDockerfile string
//go:embed templates/centos.Dockerfile
var centOSDockerfile string
var (
ubuntuDockerfileTemplate = template.Must(template.New("ubuntu.Dockerfile").Parse(ubuntuDockerfile))
debianDockerfileTemplate = template.Must(template.New("debian.Dockerfile").Parse(debianDockerfile))
alpineDockerfileTemplate = template.Must(template.New("alpine.Dockerfile").Parse(alpineDockerfile))
centOSDockerfileTemplate = template.Must(template.New("centos.Dockerfile").Parse(centOSDockerfile))
)
type Dockerfile struct {
Image string
Password string
Release OSRelease
tmpl *template.Template
}
func (d Dockerfile) Render(w io.Writer) error {
return d.tmpl.Execute(w, d)
}
func NewDockerfile(release OSRelease, img, password string) (Dockerfile, error) {
if password == "" {
password = "root"
}
d := Dockerfile{Release: release, Image: img, Password: password}
switch release.ID {
case ReleaseDebian:
d.tmpl = debianDockerfileTemplate
case ReleaseUbuntu:
d.tmpl = ubuntuDockerfileTemplate
case ReleaseAlpine:
d.tmpl = alpineDockerfileTemplate
case ReleaseCentOS:
d.tmpl = centOSDockerfileTemplate
default:
return Dockerfile{}, fmt.Errorf("unsupported distribution: %s", release.ID)
}
return d, nil
}

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examples/alpine.Dockerfile Normal file
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FROM alpine
RUN apk add --no-cache && \
echo "PermitRootLogin yes" >> /etc/ssh/sshd_config

4
examples/debian.Dockerfile Normal file
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FROM debian
RUN apt update && apt install -y openssh-server && \
echo "PermitRootLogin yes" >> /etc/ssh/sshd_config

4
examples/ubuntu.Dockerfile Normal file
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FROM ubuntu
RUN apt update && apt install -y openssh-server && \
echo "PermitRootLogin yes" >> /etc/ssh/sshd_config \

19
go.mod Normal file
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module go.linka.cloud/d2vm
go 1.17
require (
github.com/c2h5oh/datasize v0.0.0-20200825124411-48ed595a09d2
github.com/google/uuid v1.3.0
github.com/joho/godotenv v1.4.0
github.com/sirupsen/logrus v1.8.1
github.com/spf13/cobra v1.4.0
go.uber.org/multierr v1.8.0
)
require (
github.com/inconshreveable/mousetrap v1.0.0 // indirect
github.com/spf13/pflag v1.0.5 // indirect
go.uber.org/atomic v1.7.0 // indirect
golang.org/x/sys v0.0.0-20191026070338-33540a1f6037 // indirect
)

37
go.sum Normal file
View File

@ -0,0 +1,37 @@
github.com/c2h5oh/datasize v0.0.0-20200825124411-48ed595a09d2 h1:t8KYCwSKsOEZBFELI4Pn/phbp38iJ1RRAkDFNin1aak=
github.com/c2h5oh/datasize v0.0.0-20200825124411-48ed595a09d2/go.mod h1:S/7n9copUssQ56c7aAgHqftWO4LTf4xY6CGWt8Bc+3M=
github.com/cpuguy83/go-md2man/v2 v2.0.1/go.mod h1:tgQtvFlXSQOSOSIRvRPT7W67SCa46tRHOmNcaadrF8o=
github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
github.com/google/uuid v1.3.0 h1:t6JiXgmwXMjEs8VusXIJk2BXHsn+wx8BZdTaoZ5fu7I=
github.com/google/uuid v1.3.0/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo=
github.com/inconshreveable/mousetrap v1.0.0 h1:Z8tu5sraLXCXIcARxBp/8cbvlwVa7Z1NHg9XEKhtSvM=
github.com/inconshreveable/mousetrap v1.0.0/go.mod h1:PxqpIevigyE2G7u3NXJIT2ANytuPF1OarO4DADm73n8=
github.com/joho/godotenv v1.4.0 h1:3l4+N6zfMWnkbPEXKng2o2/MR5mSwTrBih4ZEkkz1lg=
github.com/joho/godotenv v1.4.0/go.mod h1:f4LDr5Voq0i2e/R5DDNOoa2zzDfwtkZa6DnEwAbqwq4=
github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
github.com/russross/blackfriday/v2 v2.1.0/go.mod h1:+Rmxgy9KzJVeS9/2gXHxylqXiyQDYRxCVz55jmeOWTM=
github.com/sirupsen/logrus v1.8.1 h1:dJKuHgqk1NNQlqoA6BTlM1Wf9DOH3NBjQyu0h9+AZZE=
github.com/sirupsen/logrus v1.8.1/go.mod h1:yWOB1SBYBC5VeMP7gHvWumXLIWorT60ONWic61uBYv0=
github.com/spf13/cobra v1.4.0 h1:y+wJpx64xcgO1V+RcnwW0LEHxTKRi2ZDPSBjWnrg88Q=
github.com/spf13/cobra v1.4.0/go.mod h1:Wo4iy3BUC+X2Fybo0PDqwJIv3dNRiZLHQymsfxlB84g=
github.com/spf13/pflag v1.0.5 h1:iy+VFUOCP1a+8yFto/drg2CJ5u0yRoB7fZw3DKv/JXA=
github.com/spf13/pflag v1.0.5/go.mod h1:McXfInJRrz4CZXVZOBLb0bTZqETkiAhM9Iw0y3An2Bg=
github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
github.com/stretchr/testify v1.2.2/go.mod h1:a8OnRcib4nhh0OaRAV+Yts87kKdq0PP7pXfy6kDkUVs=
github.com/stretchr/testify v1.3.0/go.mod h1:M5WIy9Dh21IEIfnGCwXGc5bZfKNJtfHm1UVUgZn+9EI=
github.com/stretchr/testify v1.7.0 h1:nwc3DEeHmmLAfoZucVR881uASk0Mfjw8xYJ99tb5CcY=
github.com/stretchr/testify v1.7.0/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
go.uber.org/atomic v1.7.0 h1:ADUqmZGgLDDfbSL9ZmPxKTybcoEYHgpYfELNoN+7hsw=
go.uber.org/atomic v1.7.0/go.mod h1:fEN4uk6kAWBTFdckzkM89CLk9XfWZrxpCo0nPH17wJc=
go.uber.org/multierr v1.8.0 h1:dg6GjLku4EH+249NNmoIciG9N/jURbDG+pFlTkhzIC8=
go.uber.org/multierr v1.8.0/go.mod h1:7EAYxJLBy9rStEaz58O2t4Uvip6FSURkq8/ppBp95ak=
golang.org/x/sys v0.0.0-20191026070338-33540a1f6037 h1:YyJpGZS1sBuBCzLAR1VEpK193GlqGZbnPFnPV/5Rsb4=
golang.org/x/sys v0.0.0-20191026070338-33540a1f6037/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
gopkg.in/yaml.v2 v2.4.0/go.mod h1:RDklbk79AGWmwhnvt/jBztapEOGDOx6ZbXqjP6csGnQ=
gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
gopkg.in/yaml.v3 v3.0.0-20210107192922-496545a6307b h1:h8qDotaEPuJATrMmW04NCwg7v22aHH28wwpauUhK9Oo=
gopkg.in/yaml.v3 v3.0.0-20210107192922-496545a6307b/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=

116
os_release.go Normal file
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// Copyright 2022 Linka Cloud All rights reserved.
//
// 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 docker2vm
import (
"context"
"fmt"
"os"
"path/filepath"
"strings"
"text/template"
"github.com/joho/godotenv"
"github.com/sirupsen/logrus"
"go.linka.cloud/d2vm/pkg/docker"
)
const (
ReleaseUbuntu Release = "ubuntu"
ReleaseDebian Release = "debian"
ReleaseAlpine Release = "alpine"
ReleaseCentOS Release = "centos"
)
type Release string
func (r Release) Supported() bool {
switch r {
case ReleaseUbuntu:
return true
case ReleaseDebian:
return true
case ReleaseAlpine:
return true
case ReleaseCentOS:
return true
default:
return false
}
}
type OSRelease struct {
ID Release
Name string
VersionID string
Version string
VersionCodeName string
}
func ParseOSRelease(s string) (OSRelease, error) {
env, err := godotenv.Parse(strings.NewReader(s))
if err != nil {
return OSRelease{}, err
}
o := OSRelease{
ID: Release(strings.ToLower(env["ID"])),
Name: env["NAME"],
Version: env["VERSION"],
VersionID: env["VERSION_ID"],
VersionCodeName: env["VERSION_CODENAME"],
}
return o, nil
}
const (
osReleaseDockerfile = `
FROM {{ . }}
ENTRYPOINT [""]
CMD ["/bin/cat", "/etc/os-release"]
`
)
var (
osReleaseDockerfileTemplate = template.Must(template.New("osrelease.Dockerfile").Parse(osReleaseDockerfile))
)
func FetchDockerImageOSRelease(ctx context.Context, img string, tmpPath string) (OSRelease, error) {
d := filepath.Join(tmpPath, "osrelase.Dockerfile")
f, err := os.Create(d)
if err != nil {
return OSRelease{}, err
}
defer f.Close()
if err := osReleaseDockerfileTemplate.Execute(f, img); err != nil {
return OSRelease{}, err
}
imgTag := fmt.Sprintf("os-release-%s", img)
if err := docker.Cmd(ctx, "image", "build", "-t", imgTag, "-f", d, tmpPath); err != nil {
return OSRelease{}, err
}
defer func() {
if err := docker.Cmd(ctx, "image", "rm", imgTag); err != nil {
logrus.WithError(err).Error("failed to cleanup OSRelease Docker Image")
}
}()
o, _, err := docker.CmdOut(ctx, "run", "--rm", "-i", imgTag)
if err != nil {
return OSRelease{}, err
}
return ParseOSRelease(o)
}

37
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// Copyright 2022 Linka Cloud All rights reserved.
//
// 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 docker
import (
"context"
_ "embed"
"strings"
"go.linka.cloud/d2vm/pkg/exec"
)
func FormatImgName(name string) string {
s := strings.Replace(name, ":", "-", -1)
s = strings.Replace(s, "/", "_", -1)
return s
}
func Cmd(ctx context.Context, args ...string) error {
return exec.Run(ctx, "docker", args...)
}
func CmdOut(ctx context.Context, args ...string) (string, string, error) {
return exec.RunOut(ctx, "docker", args...)
}

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pkg/exec/exec.go Normal file
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// Copyright 2022 Linka Cloud All rights reserved.
//
// 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 exec
import (
"bytes"
"context"
"fmt"
"os"
"os/exec"
"strings"
)
var (
Run = RunNoOut
CommandContext = exec.CommandContext
)
func RunStdout(ctx context.Context, c string, args ...string) error {
cmd := exec.CommandContext(ctx, c, args...)
cmd.Stdout = os.Stdout
cmd.Stderr = os.Stderr
return cmd.Run()
}
func RunNoOut(ctx context.Context, c string, args ...string) error {
_, _, err := RunOut(ctx, c, args...)
if err != nil {
return err
}
return nil
}
func RunOut(ctx context.Context, c string, args ...string) (stdout, stderr string, err error) {
cmd := exec.CommandContext(ctx, c, args...)
var stdo, stde bytes.Buffer
cmd.Stdout = &stdo
cmd.Stderr = &stde
err = cmd.Run()
if err != nil {
return "", "", fmt.Errorf("%s %s: stdout: %s stderr: %s error: %w", c, strings.Join(args, " "), stdo.String(), stde.String(), err)
}
return stdo.String(), stde.String(), nil
}

27
qemu.sh Executable file
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#!/usr/bin/env bash
# Copyright 2021 Linka Cloud All rights reserved.
#
# 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.
IMG=${1:-disk0.qcow2}
ARGS=""
if [[ $OSTYPE == 'darwin'* ]]; then
ARGS="-M accel=hvf"
else
ARGS="-use-kvm"
fi
qemu-system-x86_64 -drive file=$IMG,index=0,media=disk,format=qcow2 -m 4096 -cpu host -nographic ${ARGS} ${@: 2}

23
templates/alpine.Dockerfile Normal file
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FROM {{ .Image }}
USER root
RUN apk update --no-cache && \
apk add \
util-linux \
linux-virt \
busybox-initscripts \
openrc
#RUN apk update --no-cache && \
# apk add \
# linux-virt \
# alpine-base \
# openssh-server
RUN for s in bootmisc hostname hwclock modules networking swap sysctl urandom syslog; do rc-update add $s boot; done
RUN for s in devfs dmesg hwdrivers mdev; do rc-update add $s sysinit; done
RUN echo "root:{{- if .Password}}{{ .Password}}{{- else}}root{{- end}}" | chpasswd

18
templates/centos.Dockerfile Normal file
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FROM {{ .Image }}
USER root
RUN sed -i 's/mirrorlist/#mirrorlist/g' /etc/yum.repos.d/CentOS-* && \
sed -i 's|#baseurl=http://mirror.centos.org|baseurl=http://vault.centos.org|g' /etc/yum.repos.d/CentOS-*
RUN yum update -y && \
yum install -y kernel systemd
RUN systemctl preset-all && \
systemctl enable getty@ttyS0
RUN cd /boot && \
ln -s $(find . -name 'vmlinuz-*') vmlinuz && \
ln -s $(find . -name 'initramfs-*.img') initrd.img
RUN echo "root:{{- if .Password}}{{ .Password}}{{- else}}root{{- end}}" | chpasswd

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templates/debian.Dockerfile Normal file
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FROM {{ .Image }}
USER root
RUN apt-get -y update && \
DEBIAN_FRONTEND=noninteractive apt-get -y install --no-install-recommends \
linux-image-amd64
RUN DEBIAN_FRONTEND=noninteractive apt-get install -y --no-install-recommends \
systemd-sysv \
systemd \
dbus \
iproute2 \
udhcpc \
iputils-ping
RUN systemctl preset-all
RUN echo "root:{{- if .Password}}{{ .Password}}{{- else}}root{{- end}}" | chpasswd

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FROM {{ .Image }}
USER root
RUN apt-get update -y && \
apt-get -y install \
linux-image-virtual
RUN DEBIAN_FRONTEND=noninteractive apt-get install -y --no-install-recommends \
systemd-sysv \
systemd \
dbus \
udhcpc \
iproute2 \
iputils-ping
RUN systemctl preset-all
RUN echo "root:{{- if .Password}}{{ .Password}}{{- else}}root{{- end}}" | chpasswd

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templates/vmbuilder.sh Executable file
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#!/usr/bin/env bash
OUT="/dev/null"
if [[ -n "$DEBUG" ]]; then
set -x
OUT="/dev/stderr"
fi
set -e
SRC=${1:-rootfs.tar}
DISK_NAME=${2:-disk0}
SIZE=${3:-10G}
BLOCK="$DISK_NAME.raw"
QCOW2="$DISK_NAME.qcow2"
MOUNTPOINT=/mnt
cleanup() {
rm -rf $BLOCK
}
make_img() {
echo "Creating raw image of size $SIZE"
fallocate -l $SIZE $BLOCK &> $OUT
(
echo n # Add a new partition
echo p # Primary partition
echo 1 # Partition number
echo # First sector (Accept default: 1)
echo # Last sector (Accept default: varies)
echo a
echo w # Write changes
) | fdisk $BLOCK &> $OUT
}
mount_img() {
echo "Mounting image"
DEVICE_ROOT=$(losetup --show -f $BLOCK)
kpartx -v -a $DEVICE_ROOT &> $OUT
DEVICE=/dev/mapper/"$(basename ${DEVICE_ROOT})p1"
mkfs.ext4 $DEVICE &> $OUT
mount $DEVICE $MOUNTPOINT
}
unmount_img() {
echo "Unmounting image"
umount $MOUNTPOINT/
kpartx -d $DEVICE_ROOT &> $OUT
losetup -d $DEVICE_ROOT &> $OUT
}
copy_rootfs() {
echo "Copying root file system"
tar -xvf $SRC -C $MOUNTPOINT &> $OUT
}
setup_rootfs() {
echo "Setting up root file system"
uuid=$(blkid -s UUID -o value $DEVICE)
mkdir -p $MOUNTPOINT/etc/
echo "UUID=$uuid / ext4 errors=remount-ro 0 1" > $MOUNTPOINT/etc/fstab
echo "nameserver 8.8.8.8" > $MOUNTPOINT/etc/resolv.conf
echo localhost > $MOUNTPOINT/etc/hostname
cat <<EOF > $MOUNTPOINT/etc/hosts
127.0.0.1 localhost
# The following lines are desirable for IPv6 capable hosts
::1 ip6-localhost ip6-loopback
fe00::0 ip6-localnet
ff00::0 ip6-mcastprefix
ff02::1 ip6-allnodes
ff02::2 ip6-allrouters
ff02::3 ip6-allhosts
EOF
rm -rf $MOUNTPOINT/usr/sbin/policy-rc.d
}
install_kernel() {
echo "Installing linux kernel"
extlinux --install $MOUNTPOINT/boot/ &> $OUT
cat <<EOF > $MOUNTPOINT/boot/syslinux.cfg
DEFAULT linux
SAY Now booting the kernel from EXTLINUX...
LABEL linux
KERNEL /boot/vmlinuz
APPEND ro root=/dev/sda1 initrd=/boot/initrd.img net.ifnames=0 console=tty0 console=ttyS0,115200n8
EOF
}
setup_mbr() {
echo "Setting up boot loader"
dd if=/usr/lib/EXTLINUX/mbr.bin of=$BLOCK bs=440 count=1 conv=notrunc &> $OUT
}
convert() {
echo "Converting image to QCOW2"
echo ""
qemu-img convert $BLOCK -O qcow2 $QCOW2
}
cleanup
make_img
mount_img
copy_rootfs
setup_rootfs
install_kernel
unmount_img
setup_mbr
convert