package rootfs import ( "syscall" "github.com/containerd/containerd" rootfsapi "github.com/containerd/containerd/api/services/rootfs" containerd_v1_types "github.com/containerd/containerd/api/types/mount" "github.com/containerd/containerd/content" "github.com/containerd/containerd/log" "github.com/containerd/containerd/plugin" "github.com/containerd/containerd/rootfs" "github.com/containerd/containerd/snapshot" digest "github.com/opencontainers/go-digest" ocispec "github.com/opencontainers/image-spec/specs-go/v1" "golang.org/x/net/context" "google.golang.org/grpc" "google.golang.org/grpc/codes" ) func init() { plugin.Register("rootfs-grpc", &plugin.Registration{ Type: plugin.GRPCPlugin, Init: func(ic *plugin.InitContext) (interface{}, error) { return NewService(ic.Content, ic.Snapshotter) }, }) } type Service struct { store *content.Store snapshotter snapshot.Snapshotter } func NewService(store *content.Store, snapshotter snapshot.Snapshotter) (*Service, error) { return &Service{ store: store, snapshotter: snapshotter, }, nil } func (s *Service) Register(gs *grpc.Server) error { rootfsapi.RegisterRootFSServer(gs, s) return nil } func (s *Service) Unpack(ctx context.Context, pr *rootfsapi.UnpackRequest) (*rootfsapi.UnpackResponse, error) { layers := make([]ocispec.Descriptor, len(pr.Layers)) for i, l := range pr.Layers { layers[i] = ocispec.Descriptor{ MediaType: l.MediaType, Digest: l.Digest, Size: l.Size_, } } log.G(ctx).Infof("Preparing %#v", layers) chainID, err := rootfs.Prepare(ctx, s.snapshotter, mounter{}, layers, s.store.Reader, emptyResolver, noopRegister) if err != nil { log.G(ctx).Errorf("Rootfs Prepare failed!: %v", err) return nil, err } log.G(ctx).Infof("ChainID %#v", chainID) return &rootfsapi.UnpackResponse{ ChainID: chainID, }, nil } func (s *Service) Prepare(ctx context.Context, ir *rootfsapi.PrepareRequest) (*rootfsapi.MountResponse, error) { mounts, err := rootfs.InitRootFS(ctx, ir.Name, ir.ChainID, ir.Readonly, s.snapshotter, mounter{}) if err != nil { return nil, grpc.Errorf(codes.AlreadyExists, "%v", err) } return &rootfsapi.MountResponse{ Mounts: apiMounts(mounts), }, nil } func (s *Service) Mounts(ctx context.Context, mr *rootfsapi.MountsRequest) (*rootfsapi.MountResponse, error) { mounts, err := s.snapshotter.Mounts(ctx, mr.Name) if err != nil { return nil, err } return &rootfsapi.MountResponse{ Mounts: apiMounts(mounts), }, nil } func apiMounts(mounts []containerd.Mount) []*containerd_v1_types.Mount { am := make([]*containerd_v1_types.Mount, len(mounts)) for i, m := range mounts { am[i] = &containerd_v1_types.Mount{ Type: m.Type, Source: m.Source, Options: m.Options, } } return am } type mounter struct{} func (mounter) Mount(dir string, mounts ...containerd.Mount) error { return containerd.MountAll(mounts, dir) } func (mounter) Unmount(dir string) error { return syscall.Unmount(dir, 0) } func emptyResolver(digest.Digest) digest.Digest { return digest.Digest("") } func noopRegister(digest.Digest, digest.Digest) error { return nil }