func runRm(context *cli.Context) {
s := getStore()
args := context.Args()
if len(args) < 2 {
fmt.Println("There need to be at least two arguments.")
fmt.Println(context.Command.Usage)
return
}
// Get the manifest of the base image
base := args[0]
im, err := util.GetManifestFromImage(base)
if err != nil {
log.Fatalf("Could not extract manifest from base image: %v", err)
}
if context.Bool("all-but-last") {
im.Dependencies = im.Dependencies[len(im.Dependencies)-1:]
} else {
for _, arg := range args[1 : len(args)-1] {
layer, err := util.ExtractLayerInfo(s, arg)
if err != nil {
log.Fatalf("error extracting layer info from %s: %v", s, err)
}
for i, dep := range im.Dependencies {
if reflect.DeepEqual(layer.ImageName, dep.ImageName) && reflect.DeepEqual(layer.ImageID, dep.ImageID) {
im.Dependencies = append(im.Dependencies[:i], im.Dependencies[i+1:]...)
}
}
}
}
out := args[len(args)-1]
baseFile, err := os.Open(base)
if err != nil {
log.Fatalf("error opening base ACI: %v", err)
}
defer baseFile.Close()
outFile, err := os.Create(out)
if err != nil {
log.Fatalf("error creating output ACI: %v", err)
}
defer outFile.Close()
flagImageName := context.String("output-image-name")
if flagImageName != "" {
im.Name = types.ACIdentifier(flagImageName)
}
if err := overwriteManifest(baseFile, outFile, im); err != nil {
log.Fatalf("error writing to output ACI: %v", err)
}
}
func runAdd(context *cli.Context) {
s := getStore()
args := context.Args()
if len(args) < 2 {
fmt.Println("There need to be at least two arguments.")
fmt.Println(context.Command.Usage)
}
var dependencies types.Dependencies
for _, arg := range args[:len(args)-1] {
layer, err := util.ExtractLayerInfo(s, arg)
if err != nil {
log.Fatalf("error extracting layer info from %s: %v", s, err)
}
dependencies = append(dependencies, layer)
}
out := args[len(args)-1]
outImageName := context.String("output-image-name")
manifest := &schema.ImageManifest{
ACKind: schema.ImageManifestKind,
ACVersion: schema.AppContainerVersion,
Name: types.ACIdentifier(outImageName),
Dependencies: dependencies,
}
aciDir, err := util.PrepareACIDir(manifest, "")
if err != nil {
log.Fatalf("error prepareing ACI dir %v: %v", aciDir, err)
}
if err := util.BuildACI(aciDir, out, true, false); err != nil {
log.Fatalf("error building the final output ACI: %v", err)
}
}
func runExec(context *cli.Context) {
flagIn := context.String("in")
flagCmd := context.String("cmd")
flagOut := context.String("out")
if flagIn == "" || flagCmd == "" || flagOut == "" {
log.Fatalf("--in, --cmd, and --out need to be set")
}
flagNoOverlay := context.Bool("no-overlay")
useOverlay := util.SupportsOverlay() && !flagNoOverlay
s := getStore()
mounts, err := getMounts(context)
if err != nil {
log.Fatalf("error parsing mounts: %v", err)
}
// Render the given image in tree store
imageHash, err := renderInStore(s, flagIn)
if err != nil {
log.Fatalf("error rendering image in store: %s", err)
}
imagePath := s.GetTreeStorePath(imageHash)
// Create a tmp directory
tmpDir, err := ioutil.TempDir("", "acbuild-")
if err != nil {
log.Fatalf("error creating temporary directory: %s", err)
}
// Copy the manifest into the tmp directory
if err := shutil.CopyFile(filepath.Join(imagePath, aci.ManifestFile),
filepath.Join(tmpDir, aci.ManifestFile), true); err != nil {
log.Fatalf("error copying manifest to a temporary directory: %s", err)
}
// Extract a ImageManifest from the manifest file
manifestFile, err := os.Open(filepath.Join(tmpDir, aci.ManifestFile))
if err != nil {
log.Fatalf("error opening the copied manifest file: %v", err)
}
manifestContent, err := ioutil.ReadAll(manifestFile)
if err != nil {
log.Fatalf("error reading the copied manifest file: %v", err)
}
im := &schema.ImageManifest{}
if err := im.UnmarshalJSON(manifestContent); err != nil {
log.Fatalf("error unmarshalling JSON to manifest: %v", err)
}
// If an output image name is not given, we grab it from the input ACI
flagImageName := context.String("output-image-name")
if flagImageName == "" {
flagImageName = string(im.Name)
}
flagJail := context.Bool("jail")
// If the system supports overlayfs, use it.
// Otherwise, copy the entire rendered image to a working directory.
storeRootfsDir := filepath.Join(imagePath, aci.RootfsDir)
tmpRootfsDir := filepath.Join(tmpDir, aci.RootfsDir)
if useOverlay {
upperDir, err := mountOverlayfs(tmpRootfsDir, storeRootfsDir)
if err != nil {
log.Fatalf("error mounting overlayfs: %v", err)
}
// Note that defer functions are not run if the program
// exits via os.Exit() and by extension log.Fatal(), which
// is the behaviour that we want.
defer unmountOverlayfs(tmpRootfsDir)
if err := runCmdInDir(im, flagCmd, tmpRootfsDir, flagJail, mounts); err != nil {
log.Fatalf("error executing command: %v", err)
}
// We store the delta (i.e. side effects of the executed command) into its own ACI
// The name of the ACI is a hash of (command, hash of input image). This will make
// implementing caching easier in the future.
deltaACIName, err := util.Hash(flagCmd, imageHash)
if err != nil {
log.Fatalf("error hashing (%s %s): %s", flagCmd, imageHash, err)
}
deltaManifest := &schema.ImageManifest{
ACKind: schema.ImageManifestKind,
ACVersion: schema.AppContainerVersion,
Name: types.ACIdentifier(deltaACIName),
}
deltaACIDir, err := util.PrepareACIDir(deltaManifest, upperDir)
if err != nil {
log.Fatalf("error preparing delta ACI dir: %v", err)
}
// Create a temp directory for placing delta ACI
deltaACITempDir, err := ioutil.TempDir("", "")
if err != nil {
log.Fatalf("error creating temp dir to put delta ACI: %v", err)
}
deltaACIPath := filepath.Join(deltaACITempDir, "delta.aci")
// Build the delta ACI
if err := util.BuildACI(deltaACIDir, deltaACIPath, true, false); err != nil {
log.Fatalf("error building delta ACI: %v", err)
}
// Put the delta ACI into tree store
deltaACIFile, err := os.Open(deltaACIPath)
if err != nil {
log.Fatalf("error opening the delta ACI file: %v", err)
}
deltaKey, err := s.WriteACI(deltaACIFile, false)
if err != nil {
log.Fatalf("error writing the delta ACI into the tree store: %v", err)
}
deltaKeyHash, err := types.NewHash(deltaKey)
if err != nil {
log.Fatalf("error creating hash from an image ID (%s): %v", deltaKeyHash, err)
}
// The manifest for the output ACI
manifest := &schema.ImageManifest{
ACKind: schema.ImageManifestKind,
ACVersion: schema.AppContainerVersion,
Name: types.ACIdentifier(flagImageName),
}
if context.Bool("split") {
layers, err := util.ExtractLayers(s, flagIn)
if err != nil {
log.Fatalf("error extracting layers from %s: %v", flagIn, err)
}
manifest.Dependencies = append(manifest.Dependencies, layers...)
manifest.Dependencies = append(manifest.Dependencies, types.Dependency{
ImageName: types.ACIdentifier(deltaACIName),
ImageID: deltaKeyHash,
})
} else {
layer, err := util.ExtractLayerInfo(s, flagIn)
if err != nil {
log.Fatalf("error extracting layer info from input ACI: %v", err)
}
// two layers:
// 1. The original ACI
// 2. The delta ACI
manifest.Dependencies = types.Dependencies{
layer,
types.Dependency{
ImageName: types.ACIdentifier(deltaACIName),
ImageID: deltaKeyHash,
},
}
}
// The rootfs is empty
aciDir, err := util.PrepareACIDir(manifest, "")
if err != nil {
log.Fatalf("error prepareing ACI dir %v: %v", aciDir, err)
}
// Build the output ACI
if err := util.BuildACI(aciDir, flagOut, true, false); err != nil {
log.Fatalf("error building the final output ACI: %v", err)
}
} else {
if err := shutil.CopyTree(storeRootfsDir, tmpRootfsDir, &shutil.CopyTreeOptions{
Symlinks: true,
IgnoreDanglingSymlinks: true,
CopyFunction: shutil.Copy,
}); err != nil {
log.Fatalf("error copying rootfs to a temporary directory: %v", err)
}
if err := runCmdInDir(im, flagCmd, tmpRootfsDir, flagJail, mounts); err != nil {
log.Fatalf("error executing command: %v", err)
}
err = util.BuildACI(tmpDir, flagOut, true, false)
if err != nil {
log.Fatalf("error building output ACI image: %v", err)
}
}
}