325 lines
9.4 KiB
Go
325 lines
9.4 KiB
Go
// +build !containers_image_ostree_stub
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package ostree
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import (
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"bytes"
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"encoding/json"
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"fmt"
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"io"
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"io/ioutil"
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"os"
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"os/exec"
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"path/filepath"
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"strconv"
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"strings"
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"time"
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"github.com/containers/image/manifest"
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"github.com/containers/image/types"
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"github.com/containers/storage/pkg/archive"
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"github.com/opencontainers/go-digest"
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"github.com/pkg/errors"
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"github.com/ostreedev/ostree-go/pkg/otbuiltin"
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)
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type blobToImport struct {
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Size int64
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Digest digest.Digest
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BlobPath string
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}
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type descriptor struct {
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Size int64 `json:"size"`
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Digest digest.Digest `json:"digest"`
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}
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type manifestSchema struct {
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ConfigDescriptor descriptor `json:"config"`
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LayersDescriptors []descriptor `json:"layers"`
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}
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type ostreeImageDestination struct {
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ref ostreeReference
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manifest string
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schema manifestSchema
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tmpDirPath string
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blobs map[string]*blobToImport
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}
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// newImageDestination returns an ImageDestination for writing to an existing ostree.
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func newImageDestination(ref ostreeReference, tmpDirPath string) (types.ImageDestination, error) {
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tmpDirPath = filepath.Join(tmpDirPath, ref.branchName)
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if err := ensureDirectoryExists(tmpDirPath); err != nil {
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return nil, err
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}
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return &ostreeImageDestination{ref, "", manifestSchema{}, tmpDirPath, map[string]*blobToImport{}}, nil
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}
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// Reference returns the reference used to set up this destination. Note that this should directly correspond to user's intent,
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// e.g. it should use the public hostname instead of the result of resolving CNAMEs or following redirects.
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func (d *ostreeImageDestination) Reference() types.ImageReference {
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return d.ref
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}
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// Close removes resources associated with an initialized ImageDestination, if any.
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func (d *ostreeImageDestination) Close() error {
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return os.RemoveAll(d.tmpDirPath)
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}
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func (d *ostreeImageDestination) SupportedManifestMIMETypes() []string {
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return []string{
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manifest.DockerV2Schema2MediaType,
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}
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}
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// SupportsSignatures returns an error (to be displayed to the user) if the destination certainly can't store signatures.
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// Note: It is still possible for PutSignatures to fail if SupportsSignatures returns nil.
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func (d *ostreeImageDestination) SupportsSignatures() error {
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return nil
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}
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// ShouldCompressLayers returns true iff it is desirable to compress layer blobs written to this destination.
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func (d *ostreeImageDestination) ShouldCompressLayers() bool {
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return false
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}
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// AcceptsForeignLayerURLs returns false iff foreign layers in manifest should be actually
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// uploaded to the image destination, true otherwise.
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func (d *ostreeImageDestination) AcceptsForeignLayerURLs() bool {
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return false
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}
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// MustMatchRuntimeOS returns true iff the destination can store only images targeted for the current runtime OS. False otherwise.
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func (d *ostreeImageDestination) MustMatchRuntimeOS() bool {
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return true
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}
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func (d *ostreeImageDestination) PutBlob(stream io.Reader, inputInfo types.BlobInfo) (types.BlobInfo, error) {
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tmpDir, err := ioutil.TempDir(d.tmpDirPath, "blob")
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if err != nil {
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return types.BlobInfo{}, err
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}
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blobPath := filepath.Join(tmpDir, "content")
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blobFile, err := os.Create(blobPath)
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if err != nil {
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return types.BlobInfo{}, err
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}
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defer blobFile.Close()
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digester := digest.Canonical.Digester()
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tee := io.TeeReader(stream, digester.Hash())
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size, err := io.Copy(blobFile, tee)
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if err != nil {
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return types.BlobInfo{}, err
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}
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computedDigest := digester.Digest()
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if inputInfo.Size != -1 && size != inputInfo.Size {
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return types.BlobInfo{}, errors.Errorf("Size mismatch when copying %s, expected %d, got %d", computedDigest, inputInfo.Size, size)
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}
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if err := blobFile.Sync(); err != nil {
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return types.BlobInfo{}, err
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}
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hash := computedDigest.Hex()
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d.blobs[hash] = &blobToImport{Size: size, Digest: computedDigest, BlobPath: blobPath}
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return types.BlobInfo{Digest: computedDigest, Size: size}, nil
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}
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func fixFiles(dir string, usermode bool) error {
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entries, err := ioutil.ReadDir(dir)
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if err != nil {
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return err
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}
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for _, info := range entries {
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fullpath := filepath.Join(dir, info.Name())
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if info.Mode()&(os.ModeNamedPipe|os.ModeSocket|os.ModeDevice) != 0 {
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if err := os.Remove(fullpath); err != nil {
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return err
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}
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continue
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}
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if info.IsDir() {
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if usermode {
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if err := os.Chmod(fullpath, info.Mode()|0700); err != nil {
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return err
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}
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}
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err = fixFiles(fullpath, usermode)
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if err != nil {
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return err
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}
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} else if usermode && (info.Mode().IsRegular() || (info.Mode()&os.ModeSymlink) != 0) {
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if err := os.Chmod(fullpath, info.Mode()|0600); err != nil {
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return err
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}
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}
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}
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return nil
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}
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func (d *ostreeImageDestination) ostreeCommit(repo *otbuiltin.Repo, branch string, root string, metadata []string) error {
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opts := otbuiltin.NewCommitOptions()
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opts.AddMetadataString = metadata
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opts.Timestamp = time.Now()
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// OCI layers have no parent OSTree commit
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opts.Parent = "0000000000000000000000000000000000000000000000000000000000000000"
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_, err := repo.Commit(root, branch, opts)
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return err
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}
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func (d *ostreeImageDestination) importBlob(repo *otbuiltin.Repo, blob *blobToImport) error {
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ostreeBranch := fmt.Sprintf("ociimage/%s", blob.Digest.Hex())
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destinationPath := filepath.Join(d.tmpDirPath, blob.Digest.Hex(), "root")
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if err := ensureDirectoryExists(destinationPath); err != nil {
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return err
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}
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defer func() {
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os.Remove(blob.BlobPath)
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os.RemoveAll(destinationPath)
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}()
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if os.Getuid() == 0 {
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if err := archive.UntarPath(blob.BlobPath, destinationPath); err != nil {
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return err
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}
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if err := fixFiles(destinationPath, false); err != nil {
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return err
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}
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} else {
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os.MkdirAll(destinationPath, 0755)
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if err := exec.Command("tar", "-C", destinationPath, "--no-same-owner", "--no-same-permissions", "--delay-directory-restore", "-xf", blob.BlobPath).Run(); err != nil {
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return err
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}
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if err := fixFiles(destinationPath, true); err != nil {
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return err
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}
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}
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return d.ostreeCommit(repo, ostreeBranch, destinationPath, []string{fmt.Sprintf("docker.size=%d", blob.Size)})
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}
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func (d *ostreeImageDestination) importConfig(blob *blobToImport) error {
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ostreeBranch := fmt.Sprintf("ociimage/%s", blob.Digest.Hex())
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return exec.Command("ostree", "commit",
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"--repo", d.ref.repo,
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fmt.Sprintf("--add-metadata-string=docker.size=%d", blob.Size),
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"--branch", ostreeBranch, filepath.Dir(blob.BlobPath)).Run()
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}
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func (d *ostreeImageDestination) HasBlob(info types.BlobInfo) (bool, int64, error) {
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branch := fmt.Sprintf("ociimage/%s", info.Digest.Hex())
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output, err := exec.Command("ostree", "show", "--repo", d.ref.repo, "--print-metadata-key=docker.size", branch).CombinedOutput()
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if err != nil {
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if bytes.Index(output, []byte("not found")) >= 0 || bytes.Index(output, []byte("No such")) >= 0 {
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return false, -1, nil
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}
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return false, -1, err
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}
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size, err := strconv.ParseInt(strings.Trim(string(output), "'\n"), 10, 64)
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if err != nil {
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return false, -1, err
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}
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return true, size, nil
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}
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func (d *ostreeImageDestination) ReapplyBlob(info types.BlobInfo) (types.BlobInfo, error) {
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return info, nil
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}
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// PutManifest writes manifest to the destination.
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// FIXME? This should also receive a MIME type if known, to differentiate between schema versions.
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// If the destination is in principle available, refuses this manifest type (e.g. it does not recognize the schema),
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// but may accept a different manifest type, the returned error must be an ManifestTypeRejectedError.
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func (d *ostreeImageDestination) PutManifest(manifest []byte) error {
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d.manifest = string(manifest)
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if err := json.Unmarshal(manifest, &d.schema); err != nil {
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return err
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}
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manifestPath := filepath.Join(d.tmpDirPath, d.ref.manifestPath())
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if err := ensureParentDirectoryExists(manifestPath); err != nil {
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return err
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}
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return ioutil.WriteFile(manifestPath, manifest, 0644)
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}
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func (d *ostreeImageDestination) PutSignatures(signatures [][]byte) error {
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path := filepath.Join(d.tmpDirPath, d.ref.signaturePath(0))
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if err := ensureParentDirectoryExists(path); err != nil {
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return err
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}
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for i, sig := range signatures {
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signaturePath := filepath.Join(d.tmpDirPath, d.ref.signaturePath(i))
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if err := ioutil.WriteFile(signaturePath, sig, 0644); err != nil {
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return err
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}
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}
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return nil
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}
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func (d *ostreeImageDestination) Commit() error {
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repo, err := otbuiltin.OpenRepo(d.ref.repo)
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if err != nil {
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return err
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}
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_, err = repo.PrepareTransaction()
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if err != nil {
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return err
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}
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for _, layer := range d.schema.LayersDescriptors {
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hash := layer.Digest.Hex()
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blob := d.blobs[hash]
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// if the blob is not present in d.blobs then it is already stored in OSTree,
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// and we don't need to import it.
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if blob == nil {
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continue
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}
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err := d.importBlob(repo, blob)
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if err != nil {
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return err
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}
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}
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hash := d.schema.ConfigDescriptor.Digest.Hex()
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blob := d.blobs[hash]
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if blob != nil {
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err := d.importConfig(blob)
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if err != nil {
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return err
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}
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}
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manifestPath := filepath.Join(d.tmpDirPath, "manifest")
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metadata := []string{fmt.Sprintf("docker.manifest=%s", string(d.manifest))}
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err = d.ostreeCommit(repo, fmt.Sprintf("ociimage/%s", d.ref.branchName), manifestPath, metadata)
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_, err = repo.CommitTransaction()
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return err
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}
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func ensureDirectoryExists(path string) error {
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if _, err := os.Stat(path); err != nil && os.IsNotExist(err) {
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if err := os.MkdirAll(path, 0755); err != nil {
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return err
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}
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}
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return nil
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}
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func ensureParentDirectoryExists(path string) error {
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return ensureDirectoryExists(filepath.Dir(path))
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}
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