Imports
- github.com/opencontainers/go-digest
- github.com/urfave/cli
- golang.org/x/tools/godoc/vfs/httpfs
- github.com/sirupsen/logrus
- github.com/xiekeyang/oci-discovery/tools/engine
- github.com/omeid/go-tarfs
- golang.org/x/tools/godoc/vfs/zipfs
- golang.org/x/net/context