From c2f6e4ae5d6d53199950f1e9fc7a445972a77006 Mon Sep 17 00:00:00 2001 From: Adphi Date: Tue, 19 Apr 2022 14:01:08 +0200 Subject: [PATCH] build and convert implementations centos: WIP Signed-off-by: Adphi --- .dockerignore | 5 + .gitignore | 3 + Dockerfile | 31 ++++ LICENCE | 201 ++++++++++++++++++++++ Makefile | 38 +++++ README.md | 20 +++ builder.go | 320 ++++++++++++++++++++++++++++++++++++ cmd/d2vm/build.go | 62 +++++++ cmd/d2vm/convert.go | 79 +++++++++ cmd/d2vm/main.go | 40 +++++ convert.go | 115 +++++++++++++ docker_image.go | 72 ++++++++ dockerfile.go | 72 ++++++++ examples/alpine.Dockerfile | 4 + examples/debian.Dockerfile | 4 + examples/ubuntu.Dockerfile | 4 + go.mod | 19 +++ go.sum | 37 +++++ os_release.go | 116 +++++++++++++ pkg/docker/docker.go | 37 +++++ pkg/exec/exec.go | 57 +++++++ qemu.sh | 27 +++ templates/alpine.Dockerfile | 23 +++ templates/centos.Dockerfile | 18 ++ templates/debian.Dockerfile | 19 +++ templates/ubuntu.Dockerfile | 20 +++ templates/vmbuilder.sh | 116 +++++++++++++ 27 files changed, 1559 insertions(+) create mode 100644 .dockerignore create mode 100644 .gitignore create mode 100644 Dockerfile create mode 100644 LICENCE create mode 100644 Makefile create mode 100644 README.md create mode 100644 builder.go create mode 100644 cmd/d2vm/build.go create mode 100644 cmd/d2vm/convert.go create mode 100644 cmd/d2vm/main.go create mode 100644 convert.go create mode 100644 docker_image.go create mode 100644 dockerfile.go create mode 100644 examples/alpine.Dockerfile create mode 100644 examples/debian.Dockerfile create mode 100644 examples/ubuntu.Dockerfile create mode 100644 go.mod create mode 100644 go.sum create mode 100644 os_release.go create mode 100644 pkg/docker/docker.go create mode 100644 pkg/exec/exec.go create mode 100755 qemu.sh create mode 100644 templates/alpine.Dockerfile create mode 100644 templates/centos.Dockerfile create mode 100644 templates/debian.Dockerfile create mode 100644 templates/ubuntu.Dockerfile create mode 100755 templates/vmbuilder.sh diff --git a/.dockerignore b/.dockerignore new file mode 100644 index 0000000..430cb83 --- /dev/null +++ b/.dockerignore @@ -0,0 +1,5 @@ +.idea +tests +disk* +qemu.sh +*.qcow2 diff --git a/.gitignore b/.gitignore new file mode 100644 index 0000000..b6ee9b8 --- /dev/null +++ b/.gitignore @@ -0,0 +1,3 @@ +.idea +tests +disk*.qcow2 diff --git a/Dockerfile b/Dockerfile new file mode 100644 index 0000000..2511e71 --- /dev/null +++ b/Dockerfile @@ -0,0 +1,31 @@ +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/ diff --git a/LICENCE b/LICENCE new file mode 100644 index 0000000..d2948c7 --- /dev/null +++ b/LICENCE @@ -0,0 +1,201 @@ + Apache License + Version 2.0, January 2004 + http://www.apache.org/licenses/ + + TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION + + 1. Definitions. + + "License" shall mean the terms and conditions for use, reproduction, + and distribution as defined by Sections 1 through 9 of this document. + + "Licensor" shall mean the copyright owner or entity authorized by + the copyright owner that is granting the License. + + "Legal Entity" shall mean the union of the acting entity and all + other entities that control, are controlled by, or are under common + control with that entity. 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However, in accepting such obligations, You may act only + on Your own behalf and on Your sole responsibility, not on behalf + of any other Contributor, and only if You agree to indemnify, + defend, and hold each Contributor harmless for any liability + incurred by, or claims asserted against, such Contributor by reason + of your accepting any such warranty or additional liability. + + 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 "[]" + replaced with your own identifying information. (Don't include + the brackets!) The text should be enclosed in the appropriate + comment syntax for the file format. We also recommend that a + file or class name and description of purpose be included on the + same "printed page" as the copyright notice for easier + identification within third-party archives. + + 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. diff --git a/Makefile b/Makefile new file mode 100644 index 0000000..28ece84 --- /dev/null +++ b/Makefile @@ -0,0 +1,38 @@ +# 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 diff --git a/README.md b/README.md new file mode 100644 index 0000000..605effb --- /dev/null +++ b/README.md @@ -0,0 +1,20 @@ +# 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 +``` diff --git a/builder.go b/builder.go new file mode 100644 index 0000000..0858341 --- /dev/null +++ b/builder.go @@ -0,0 +1,320 @@ +// 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) +} diff --git a/cmd/d2vm/build.go b/cmd/d2vm/build.go new file mode 100644 index 0000000..77d6374 --- /dev/null +++ b/cmd/d2vm/build.go @@ -0,0 +1,62 @@ +// 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") +} diff --git a/cmd/d2vm/convert.go b/cmd/d2vm/convert.go new file mode 100644 index 0000000..186bb05 --- /dev/null +++ b/cmd/d2vm/convert.go @@ -0,0 +1,79 @@ +// 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) +} diff --git a/cmd/d2vm/main.go b/cmd/d2vm/main.go new file mode 100644 index 0000000..411ea1d --- /dev/null +++ b/cmd/d2vm/main.go @@ -0,0 +1,40 @@ +// 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) +} diff --git a/convert.go b/convert.go new file mode 100644 index 0000000..22d2438 --- /dev/null +++ b/convert.go @@ -0,0 +1,115 @@ +// 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 +} diff --git a/docker_image.go b/docker_image.go new file mode 100644 index 0000000..0e7264c --- /dev/null +++ b/docker_image.go @@ -0,0 +1,72 @@ +// 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) +} diff --git a/dockerfile.go b/dockerfile.go new file mode 100644 index 0000000..a322400 --- /dev/null +++ b/dockerfile.go @@ -0,0 +1,72 @@ +// 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 +} diff --git a/examples/alpine.Dockerfile b/examples/alpine.Dockerfile new file mode 100644 index 0000000..5d22a7a --- /dev/null +++ b/examples/alpine.Dockerfile @@ -0,0 +1,4 @@ +FROM alpine + +RUN apk add --no-cache && \ + echo "PermitRootLogin yes" >> /etc/ssh/sshd_config diff --git a/examples/debian.Dockerfile b/examples/debian.Dockerfile new file mode 100644 index 0000000..4c1f475 --- /dev/null +++ b/examples/debian.Dockerfile @@ -0,0 +1,4 @@ +FROM debian + +RUN apt update && apt install -y openssh-server && \ + echo "PermitRootLogin yes" >> /etc/ssh/sshd_config diff --git a/examples/ubuntu.Dockerfile b/examples/ubuntu.Dockerfile new file mode 100644 index 0000000..cc7840d --- /dev/null +++ b/examples/ubuntu.Dockerfile @@ -0,0 +1,4 @@ +FROM ubuntu + +RUN apt update && apt install -y openssh-server && \ + echo "PermitRootLogin yes" >> /etc/ssh/sshd_config \ diff --git a/go.mod b/go.mod new file mode 100644 index 0000000..187eebf --- /dev/null +++ b/go.mod @@ -0,0 +1,19 @@ +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 +) diff --git a/go.sum b/go.sum new file mode 100644 index 0000000..6c56d88 --- /dev/null +++ b/go.sum @@ -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= diff --git a/os_release.go b/os_release.go new file mode 100644 index 0000000..5e8103f --- /dev/null +++ b/os_release.go @@ -0,0 +1,116 @@ +// 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) +} diff --git a/pkg/docker/docker.go b/pkg/docker/docker.go new file mode 100644 index 0000000..1ea32ee --- /dev/null +++ b/pkg/docker/docker.go @@ -0,0 +1,37 @@ +// 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...) +} diff --git a/pkg/exec/exec.go b/pkg/exec/exec.go new file mode 100644 index 0000000..5231cb9 --- /dev/null +++ b/pkg/exec/exec.go @@ -0,0 +1,57 @@ +// 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 +} diff --git a/qemu.sh b/qemu.sh new file mode 100755 index 0000000..767430e --- /dev/null +++ b/qemu.sh @@ -0,0 +1,27 @@ +#!/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} diff --git a/templates/alpine.Dockerfile b/templates/alpine.Dockerfile new file mode 100644 index 0000000..5d035e1 --- /dev/null +++ b/templates/alpine.Dockerfile @@ -0,0 +1,23 @@ +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 + diff --git a/templates/centos.Dockerfile b/templates/centos.Dockerfile new file mode 100644 index 0000000..9305c39 --- /dev/null +++ b/templates/centos.Dockerfile @@ -0,0 +1,18 @@ +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 $(find . -name 'initramfs-*.img') initrd.img + +RUN echo "root:{{- if .Password}}{{ .Password}}{{- else}}root{{- end}}" | chpasswd diff --git a/templates/debian.Dockerfile b/templates/debian.Dockerfile new file mode 100644 index 0000000..e241fd3 --- /dev/null +++ b/templates/debian.Dockerfile @@ -0,0 +1,19 @@ +FROM {{ .Image }} + +USER root + +RUN apt-get -y update && \ + DEBIAN_FRONTEND=noninteractive apt-get -y install --no-install-recommends \ + linux-image-amd64 + +RUN DEBIAN_FRONTEND=noninteractive apt-get install -y --no-install-recommends \ + systemd-sysv \ + systemd \ + dbus \ + iproute2 \ + udhcpc \ + iputils-ping + +RUN systemctl preset-all + +RUN echo "root:{{- if .Password}}{{ .Password}}{{- else}}root{{- end}}" | chpasswd diff --git a/templates/ubuntu.Dockerfile b/templates/ubuntu.Dockerfile new file mode 100644 index 0000000..7743537 --- /dev/null +++ b/templates/ubuntu.Dockerfile @@ -0,0 +1,20 @@ +FROM {{ .Image }} + +USER root + +RUN apt-get update -y && \ + apt-get -y install \ + linux-image-virtual + + +RUN DEBIAN_FRONTEND=noninteractive apt-get install -y --no-install-recommends \ + systemd-sysv \ + systemd \ + dbus \ + udhcpc \ + iproute2 \ + iputils-ping + +RUN systemctl preset-all + +RUN echo "root:{{- if .Password}}{{ .Password}}{{- else}}root{{- end}}" | chpasswd diff --git a/templates/vmbuilder.sh b/templates/vmbuilder.sh new file mode 100755 index 0000000..f161a4a --- /dev/null +++ b/templates/vmbuilder.sh @@ -0,0 +1,116 @@ +#!/usr/bin/env bash + +OUT="/dev/null" + +if [[ -n "$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 < $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 < $MOUNTPOINT/boot/syslinux.cfg +DEFAULT linux + SAY Now booting the kernel from EXTLINUX... + LABEL linux + KERNEL /boot/vmlinuz + APPEND ro root=/dev/sda1 initrd=/boot/initrd.img net.ifnames=0 console=tty0 console=ttyS0,115200n8 +EOF +} + +setup_mbr() { + echo "Setting up boot loader" + dd if=/usr/lib/EXTLINUX/mbr.bin of=$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