Current versions of Docker complain:
Sending build context to Docker daemon 5.12kB
Step 1/4 : FROM linuxkit/guestfs@sha256:62e810869e83dabe04af7ac8fcd81d9f177d986a3424dcb9c4eb5439993c962f
...
Successfully tagged linuxkit/mkimage-gcp:736880776838c8f41c081276d9c017ae6adbf1bb-amd64
Tagging linuxkit/guestfs@sha256:62e810869e83dabe04af7ac8fcd81d9f177d986a3424dcb9c4eb5439993c962f as linuxkit/guestfs:aecc40bf84ce4f4238e06934c46d7cc570a39eed@sha256:62e810869e83dabe04af7ac8fcd81d9f177d986a3424dcb9c4eb5439993c962f
refusing to create a tag with a digest reference
../../pkg/package.mk:82: recipe for target 'tag-y' failed
Just use the digest for now. Perhaps someone will have time to fixup this build
properly at some point.
Make the same change to test/pkg/ltp.
Signed-off-by: Ian Campbell <ijc@docker.com>