forked from jgsqware/clairctl
/
dockercli.go
228 lines (196 loc) · 5.23 KB
/
dockercli.go
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package dockercli
import (
"compress/bzip2"
"compress/gzip"
"context"
"encoding/json"
"fmt"
"io"
"io/ioutil"
"os"
"strings"
"syscall"
"github.com/artyom/untar"
"github.com/coreos/pkg/capnslog"
"github.com/docker/distribution"
"github.com/docker/distribution/manifest/schema1"
"github.com/docker/docker/client"
"github.com/docker/docker/image"
"github.com/docker/docker/layer"
"github.com/docker/docker/reference"
"github.com/jgsqware/clairctl/config"
"github.com/opencontainers/go-digest"
)
var log = capnslog.NewPackageLogger("github.com/jgsqware/clairctl", "dockercli")
//GetLocalManifest retrieve manifest for local image
func GetLocalManifest(imageName string, withExport bool) (reference.NamedTagged, distribution.Manifest, error) {
n, err := reference.ParseNamed(imageName)
if err != nil {
return nil, nil, err
}
var image reference.NamedTagged
if reference.IsNameOnly(n) {
image = reference.WithDefaultTag(n).(reference.NamedTagged)
} else {
image = n.(reference.NamedTagged)
}
if err != nil {
return nil, nil, err
}
var manifest distribution.Manifest
if withExport {
manifest, err = save(image.Name() + ":" + image.Tag())
} else {
manifest, err = historyFromCommand(image.Name() + ":" + image.Tag())
}
if err != nil {
return nil, schema1.SignedManifest{}, err
}
m := manifest.(schema1.SignedManifest)
m.Name = image.Name()
m.Tag = image.Tag()
return image, m, err
}
func saveImage(imageName string, fo *os.File) error {
return nil
// save.Stderr = &stderr
// save.Stdout = writer
// err := save.Run()
// if err != nil {
// return errors.New(stderr.String())
// }
// return nil
}
func save(imageName string) (distribution.Manifest, error) {
path := config.TmpLocal() + "/" + strings.Split(imageName, ":")[0] + "/blobs"
if _, err := os.Stat(path); os.IsExist(err) {
err := os.RemoveAll(path)
if err != nil {
return nil, err
}
}
err := os.MkdirAll(path, 0755)
if err != nil {
return nil, err
}
log.Debug("docker image to save: ", imageName)
log.Debug("saving in: ", path)
cli, err := client.NewEnvClient()
if err != nil {
panic(err)
}
img, err := cli.ImageSave(context.Background(), []string{imageName})
if err != nil {
return nil, fmt.Errorf("cannot save image %s: %s", imageName, err)
}
all, err := ioutil.ReadAll(img)
if err != nil {
panic(err)
}
img.Close()
fo, err := os.Create(path + "/output.tar")
// close fo on exit and check for its returned error
defer func() {
if err := fo.Close(); err != nil {
panic(err)
}
}()
if err != nil {
log.Error(err)
return nil, err
}
if _, err := fo.Write(all); err != nil {
panic(err)
}
err = openAndUntar(path+"/output.tar", path)
if err != nil {
log.Error(err)
return nil, err
}
err = os.Remove(path + "/output.tar")
if err != nil {
log.Error(err)
return nil, err
}
return historyFromManifest(path)
}
func historyFromManifest(path string) (distribution.Manifest, error) {
mf, err := os.Open(path + "/manifest.json")
defer mf.Close()
if err != nil {
return schema1.SignedManifest{}, err
}
// https://github.com/docker/docker/blob/master/image/tarexport/tarexport.go#L17
type manifestItem struct {
Config string
RepoTags []string
Layers []string
Parent image.ID `json:",omitempty"`
LayerSources map[layer.DiffID]distribution.Descriptor `json:",omitempty"`
}
var manifest []manifestItem
if err = json.NewDecoder(mf).Decode(&manifest); err != nil {
return schema1.SignedManifest{}, err
} else if len(manifest) != 1 {
return schema1.SignedManifest{}, err
}
var layers []string
for _, layer := range manifest[0].Layers {
layers = append(layers, strings.TrimSuffix(layer, "/layer.tar"))
}
var m schema1.SignedManifest
for _, layer := range manifest[0].Layers {
var d digest.Digest
d, err := digest.Parse("sha256:" + strings.TrimSuffix(layer, "/layer.tar"))
if err != nil {
return schema1.SignedManifest{}, err
}
m.FSLayers = append(m.FSLayers, schema1.FSLayer{BlobSum: d})
}
return m, nil
}
func historyFromCommand(imageName string) (schema1.SignedManifest, error) {
client, err := client.NewEnvClient()
if err != nil {
return schema1.SignedManifest{}, err
}
histories, err := client.ImageHistory(context.Background(), imageName)
manifest := schema1.SignedManifest{}
for _, history := range histories {
var d digest.Digest
d, err := digest.Parse(history.ID)
if err != nil {
return schema1.SignedManifest{}, err
}
manifest.FSLayers = append(manifest.FSLayers, schema1.FSLayer{BlobSum: d})
}
return manifest, nil
}
func openAndUntar(name, dst string) error {
var rd io.Reader
f, err := os.Open(name)
defer f.Close()
if err != nil {
return err
}
rd = f
if strings.HasSuffix(name, ".gz") || strings.HasSuffix(name, ".tgz") {
gr, err := gzip.NewReader(f)
if err != nil {
return err
}
defer gr.Close()
rd = gr
} else if strings.HasSuffix(name, ".bz2") {
rd = bzip2.NewReader(f)
}
if err := os.MkdirAll(dst, os.ModeDir|os.ModePerm); err != nil {
return err
}
// resetting umask is essential to have exact permissions on unpacked
// files; it's not not put inside untar function as it changes
// process-wide umask
mask := syscall.Umask(0)
defer syscall.Umask(mask)
return untar.Untar(rd, dst)
}