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simpledocker.go
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simpledocker.go
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// Copyright © 2019 Ettore Di Giacinto <mudler@gentoo.org>
//
// This program is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation; either version 2 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License along
// with this program; if not, see <http://www.gnu.org/licenses/>.
package backend
import (
"encoding/json"
"io/ioutil"
"os"
"os/exec"
"path/filepath"
"strings"
fileHelper "github.com/geaaru/luet/pkg/helpers/file"
docker "github.com/fsouza/go-dockerclient"
capi "github.com/mudler/docker-companion/api"
"github.com/geaaru/luet/pkg/helpers"
. "github.com/geaaru/luet/pkg/logger"
"github.com/pkg/errors"
)
type SimpleDocker struct{}
func NewSimpleDockerBackend() *SimpleDocker {
return &SimpleDocker{}
}
// TODO: Missing still: labels, and build args expansion
func (*SimpleDocker) BuildImage(opts Options) error {
name := opts.ImageName
buildarg := genBuildCommand(opts)
Info(":whale2: Building image " + name)
cmd := exec.Command("docker", buildarg...)
cmd.Dir = opts.SourcePath
err := runCommand(cmd)
if err != nil {
return err
}
Info(":whale: Building image " + name + " done")
if os.Getenv("DOCKER_SQUASH") == "true" {
Info(":whale: Squashing image " + name)
var client *docker.Client
Spinner(22)
defer SpinnerStop()
client, err = docker.NewClientFromEnv()
if err != nil {
return errors.Wrap(err, "could not connect to the Docker daemon")
}
err = capi.Squash(client, name, name)
if err != nil {
return errors.Wrap(err, "Failed squashing image")
}
Info(":whale: Squashing image " + name + " done")
}
return nil
}
func (*SimpleDocker) CopyImage(src, dst string) error {
Debug(":whale: Tagging image:", src, "->", dst)
cmd := exec.Command("docker", "tag", src, dst)
out, err := cmd.CombinedOutput()
if err != nil {
return errors.Wrap(err, "Failed tagging image: "+string(out))
}
Info(":whale: Tagged image:", src, "->", dst)
return nil
}
func (*SimpleDocker) DownloadImage(opts Options) error {
name := opts.ImageName
buildarg := []string{"pull", name}
Debug(":whale: Downloading image " + name)
Spinner(22)
defer SpinnerStop()
cmd := exec.Command("docker", buildarg...)
out, err := cmd.CombinedOutput()
if err != nil {
return errors.Wrap(err, "Failed pulling image: "+string(out))
}
Info(":whale: Downloaded image:", name)
return nil
}
func (*SimpleDocker) ImageExists(imagename string) bool {
buildarg := []string{"inspect", "--type=image", imagename}
Debug(":whale: Checking existance of docker image: " + imagename)
cmd := exec.Command("docker", buildarg...)
out, err := cmd.CombinedOutput()
if err != nil {
Debug("Image not present")
Debug(string(out))
return false
}
return true
}
func (*SimpleDocker) ImageAvailable(imagename string) bool {
return imageAvailable(imagename)
}
func (*SimpleDocker) RemoveImage(opts Options) error {
name := opts.ImageName
buildarg := []string{"rmi", name}
out, err := exec.Command("docker", buildarg...).CombinedOutput()
if err != nil {
return errors.Wrap(err, "Failed removing image: "+string(out))
}
Info(":whale: Removed image:", name)
//Info(string(out))
return nil
}
func (*SimpleDocker) Push(opts Options) error {
name := opts.ImageName
pusharg := []string{"push", name}
Spinner(22)
defer SpinnerStop()
out, err := exec.Command("docker", pusharg...).CombinedOutput()
if err != nil {
return errors.Wrap(err, "Failed pushing image: "+string(out))
}
Info(":whale: Pushed image:", name)
//Info(string(out))
return nil
}
func (s *SimpleDocker) ImageDefinitionToTar(opts Options) error {
if err := s.BuildImage(opts); err != nil {
return errors.Wrap(err, "Failed building image")
}
if err := s.ExportImage(opts); err != nil {
return errors.Wrap(err, "Failed exporting image")
}
if err := s.RemoveImage(opts); err != nil {
return errors.Wrap(err, "Failed removing image")
}
return nil
}
func (*SimpleDocker) ExportImage(opts Options) error {
name := opts.ImageName
path := opts.Destination
buildarg := []string{"save", name, "-o", path}
Debug(":whale: Saving image " + name)
Spinner(22)
defer SpinnerStop()
out, err := exec.Command("docker", buildarg...).CombinedOutput()
if err != nil {
return errors.Wrap(err, "Failed exporting image: "+string(out))
}
Debug(":whale: Exported image:", name)
return nil
}
type ManifestEntry struct {
Layers []string `json:"Layers"`
}
func (b *SimpleDocker) ExtractRootfs(opts Options, keepPerms bool) error {
name := opts.ImageName
dst := opts.Destination
if !b.ImageExists(name) {
if err := b.DownloadImage(opts); err != nil {
return errors.Wrap(err, "failed pulling image "+name+" during extraction")
}
}
tempexport, err := ioutil.TempDir(dst, "tmprootfs")
if err != nil {
return errors.Wrap(err, "Error met while creating tempdir for rootfs")
}
defer os.RemoveAll(tempexport) // clean up
imageExport := filepath.Join(tempexport, "image.tar")
Spinner(22)
defer SpinnerStop()
if err := b.ExportImage(Options{ImageName: name, Destination: imageExport}); err != nil {
return errors.Wrap(err, "failed while extracting rootfs for "+name)
}
SpinnerStop()
src := imageExport
if src == "" && opts.ImageName != "" {
tempUnpack, err := ioutil.TempDir(dst, "tempUnpack")
if err != nil {
return errors.Wrap(err, "Error met while creating tempdir for rootfs")
}
defer os.RemoveAll(tempUnpack) // clean up
imageExport := filepath.Join(tempUnpack, "image.tar")
if err := b.ExportImage(Options{ImageName: opts.ImageName, Destination: imageExport}); err != nil {
return errors.Wrap(err, "while exporting image before extraction")
}
src = imageExport
}
rootfs, err := ioutil.TempDir(dst, "tmprootfs")
if err != nil {
return errors.Wrap(err, "Error met while creating tempdir for rootfs")
}
defer os.RemoveAll(rootfs) // clean up
// TODO: Following as option if archive as output?
// archive, err := ioutil.TempDir(os.TempDir(), "archive")
// if err != nil {
// return nil, errors.Wrap(err, "Error met while creating tempdir for rootfs")
// }
// defer os.RemoveAll(archive) // clean up
err = helpers.Untar(src, rootfs, keepPerms, true)
if err != nil {
return errors.Wrap(err, "Error met while unpacking rootfs")
}
manifest, err := fileHelper.Read(filepath.Join(rootfs, "manifest.json"))
if err != nil {
return errors.Wrap(err, "Error met while reading image manifest")
}
// Unpack all layers
var manifestData []ManifestEntry
if err := json.Unmarshal([]byte(manifest), &manifestData); err != nil {
return errors.Wrap(err, "Error met while unmarshalling manifest")
}
layers_sha := []string{}
for _, data := range manifestData {
for _, l := range data.Layers {
if strings.Contains(l, "layer.tar") {
layers_sha = append(layers_sha, strings.Replace(l, "/layer.tar", "", -1))
}
}
}
// TODO: Drop capi in favor of the img approach already used in pkg/installer/repository
export, err := capi.CreateExport(rootfs)
if err != nil {
return err
}
err = export.UnPackLayers(layers_sha, dst, "containerd")
if err != nil {
return err
}
// err = helpers.Tar(archive, dst)
// if err != nil {
// return nil, errors.Wrap(err, "Error met while creating package archive")
// }
return nil
}