diff options
Diffstat (limited to 'test/bin2img')
| -rw-r--r-- | test/bin2img/bin2img.go | 226 |
1 files changed, 226 insertions, 0 deletions
diff --git a/test/bin2img/bin2img.go b/test/bin2img/bin2img.go new file mode 100644 index 000000000..b75289458 --- /dev/null +++ b/test/bin2img/bin2img.go @@ -0,0 +1,226 @@ +package main + +import ( + "archive/tar" + "bytes" + "encoding/json" + "io" + "os" + "runtime" + + "github.com/containers/image/storage" + "github.com/containers/image/types" + sstorage "github.com/containers/storage" + "github.com/containers/storage/pkg/reexec" + digest "github.com/opencontainers/go-digest" + specs "github.com/opencontainers/image-spec/specs-go" + "github.com/opencontainers/image-spec/specs-go/v1" + "github.com/sirupsen/logrus" + "github.com/urfave/cli" +) + +func main() { + if reexec.Init() { + return + } + + app := cli.NewApp() + app.Name = "bin2img" + app.Usage = "barebones image builder" + app.Version = "0.0.1" + + app.Flags = []cli.Flag{ + cli.BoolFlag{ + Name: "debug", + Usage: "turn on debug logging", + }, + cli.StringFlag{ + Name: "root", + Usage: "graph root directory", + }, + cli.StringFlag{ + Name: "runroot", + Usage: "run root directory", + }, + cli.StringFlag{ + Name: "storage-driver", + Usage: "storage driver", + }, + cli.StringSliceFlag{ + Name: "storage-opt", + Usage: "storage option", + }, + cli.StringFlag{ + Name: "image-name", + Usage: "set image name", + Value: "kubernetes/pause", + }, + cli.StringFlag{ + Name: "source-binary", + Usage: "source binary", + Value: "../../pause/pause", + }, + cli.StringFlag{ + Name: "image-binary", + Usage: "image binary", + Value: "/pause", + }, + } + + app.Action = func(c *cli.Context) error { + debug := c.GlobalBool("debug") + rootDir := c.GlobalString("root") + runrootDir := c.GlobalString("runroot") + storageDriver := c.GlobalString("storage-driver") + storageOptions := c.GlobalStringSlice("storage-opt") + imageName := c.GlobalString("image-name") + sourceBinary := c.GlobalString("source-binary") + imageBinary := c.GlobalString("image-binary") + + if debug { + logrus.SetLevel(logrus.DebugLevel) + } else { + logrus.SetLevel(logrus.ErrorLevel) + } + if rootDir == "" && runrootDir != "" { + logrus.Errorf("must set --root and --runroot, or neither") + os.Exit(1) + } + if rootDir != "" && runrootDir == "" { + logrus.Errorf("must set --root and --runroot, or neither") + os.Exit(1) + } + storeOptions := sstorage.DefaultStoreOptions + if rootDir != "" && runrootDir != "" { + storeOptions.GraphDriverName = storageDriver + storeOptions.GraphDriverOptions = storageOptions + storeOptions.GraphRoot = rootDir + storeOptions.RunRoot = runrootDir + } + store, err := sstorage.GetStore(storeOptions) + if err != nil { + logrus.Errorf("error opening storage: %v", err) + os.Exit(1) + } + defer func() { + _, _ = store.Shutdown(false) + }() + + layerBuffer := &bytes.Buffer{} + binary, err := os.Open(sourceBinary) + if err != nil { + logrus.Errorf("error opening image binary: %v", err) + os.Exit(1) + } + binInfo, err := binary.Stat() + if err != nil { + logrus.Errorf("error statting image binary: %v", err) + os.Exit(1) + } + archive := tar.NewWriter(layerBuffer) + err = archive.WriteHeader(&tar.Header{ + Name: imageBinary, + Size: binInfo.Size(), + Mode: 0555, + ModTime: binInfo.ModTime(), + Typeflag: tar.TypeReg, + Uname: "root", + Gname: "root", + }) + if err != nil { + logrus.Errorf("error writing archive header: %v", err) + os.Exit(1) + } + _, err = io.Copy(archive, binary) + if err != nil { + logrus.Errorf("error archiving image binary: %v", err) + os.Exit(1) + } + archive.Close() + binary.Close() + layerInfo := types.BlobInfo{ + Digest: digest.Canonical.FromBytes(layerBuffer.Bytes()), + Size: int64(layerBuffer.Len()), + } + + ref, err := storage.Transport.ParseStoreReference(store, imageName) + if err != nil { + logrus.Errorf("error parsing image name: %v", err) + os.Exit(1) + } + img, err := ref.NewImageDestination(nil) + if err != nil { + logrus.Errorf("error preparing to write image: %v", err) + os.Exit(1) + } + defer img.Close() + layer, err := img.PutBlob(layerBuffer, layerInfo) + if err != nil { + logrus.Errorf("error preparing to write image: %v", err) + os.Exit(1) + } + config := &v1.Image{ + Architecture: runtime.GOARCH, + OS: runtime.GOOS, + Config: v1.ImageConfig{ + User: "root", + Entrypoint: []string{imageBinary}, + }, + RootFS: v1.RootFS{ + Type: "layers", + DiffIDs: []digest.Digest{ + layer.Digest, + }, + }, + } + cbytes, err := json.Marshal(config) + if err != nil { + logrus.Errorf("error encoding configuration: %v", err) + os.Exit(1) + } + configInfo := types.BlobInfo{ + Digest: digest.Canonical.FromBytes(cbytes), + Size: int64(len(cbytes)), + } + configInfo, err = img.PutBlob(bytes.NewBuffer(cbytes), configInfo) + if err != nil { + logrus.Errorf("error saving configuration: %v", err) + os.Exit(1) + } + manifest := &v1.Manifest{ + Versioned: specs.Versioned{ + SchemaVersion: 2, + }, + Config: v1.Descriptor{ + MediaType: v1.MediaTypeImageConfig, + Digest: configInfo.Digest, + Size: int64(len(cbytes)), + }, + Layers: []v1.Descriptor{{ + MediaType: v1.MediaTypeImageLayer, + Digest: layer.Digest, + Size: layer.Size, + }}, + } + mbytes, err := json.Marshal(manifest) + if err != nil { + logrus.Errorf("error encoding manifest: %v", err) + os.Exit(1) + } + err = img.PutManifest(mbytes) + if err != nil { + logrus.Errorf("error saving manifest: %v", err) + os.Exit(1) + } + err = img.Commit() + if err != nil { + logrus.Errorf("error committing image: %v", err) + os.Exit(1) + } + return nil + } + + if err := app.Run(os.Args); err != nil { + logrus.Fatal(err) + } +} |