moby/hack/make/.build-empty-images

#!/usr/bin/env bash
set -e

function imageNotPresent {
	local img="$1"
	! docker image inspect "$img" > /dev/null 2> /dev/null
}

if imageNotPresent "emptyfs"; then
	# build a "docker save" tarball for "emptyfs"
	# see https://github.com/docker/docker/pull/5262
	# and also https://github.com/docker/docker/issues/4242
	dir="$DEST/emptyfs"
	uuid=511136ea3c5a64f264b78b5433614aec563103b4d4702f3ba7d4d2698e22c158
	mkdir -p "$dir/$uuid"
	(
		echo '[{"Config":"11f64303f0f7ffdc71f001788132bca5346831939a956e3e975c93267d89a16d.json","RepoTags":["emptyfs:latest"],"Layers":["511136ea3c5a64f264b78b5433614aec563103b4d4702f3ba7d4d2698e22c158/layer.tar"]}]' > "$dir/manifest.json"
		echo -n '{"architecture":"x86_64","comment":"Imported from -","container_config":{"Hostname":"","Domainname":"","User":"","AttachStdin":false,"AttachStdout":false,"AttachStderr":false,"Tty":false,"OpenStdin":false,"StdinOnce":false,"Env":null,"Cmd":null,"Image":"","Volumes":null,"WorkingDir":"","Entrypoint":null,"OnBuild":null,"Labels":null},"created":"2013-06-13T14:03:50.821769-07:00","docker_version":"0.4.0","history":[{"created":"2013-06-13T14:03:50.821769-07:00","comment":"Imported from -"}],"rootfs":{"type":"layers","diff_ids":["sha256:84ff92691f909a05b224e1c56abb4864f01b4f8e3c854e4bb4c7baf1d3f6d652"]}}' > "$dir/11f64303f0f7ffdc71f001788132bca5346831939a956e3e975c93267d89a16d.json"

		echo '{"emptyfs":{"latest":"511136ea3c5a64f264b78b5433614aec563103b4d4702f3ba7d4d2698e22c158"}}' > "$dir/repositories"
		cd "$dir/$uuid"
		echo '{"id":"511136ea3c5a64f264b78b5433614aec563103b4d4702f3ba7d4d2698e22c158","comment":"Imported from -","created":"2013-06-13T14:03:50.821769-07:00","container_config":{"Hostname":"","Domainname":"","User":"","Memory":0,"MemorySwap":0,"CpuShares":0,"AttachStdin":false,"AttachStdout":false,"AttachStderr":false,"PortSpecs":null,"ExposedPorts":null,"Tty":false,"OpenStdin":false,"StdinOnce":false,"Env":null,"Cmd":null,"Image":"","Volumes":null,"WorkingDir":"","Entrypoint":null,"NetworkDisabled":false,"OnBuild":null},"docker_version":"0.4.0","architecture":"x86_64","Size":0}' > json
		echo '1.0' > VERSION
		tar -cf layer.tar --files-from /dev/null
	)
	(
		[ -n "$TESTDEBUG" ] && set -x
		tar -cC "$dir" . | docker load
	)
	rm -rf "$dir"
fi

# without c8d image store, image id is the config's id
dangling_cfg=0df1207206e5288f4a989a2f13d1f5b3c4e70467702c1d5d21dfc9f002b7bd43
# with c8d image store, image id is the id of manifest/manifest list.
dangling_mfst=16d365089e5c10e1673ee82ab5bba38ade9b763296ad918bd24b42a1156c5456
if imageNotPresent "$dangling_cfg" && imageNotPresent "$dangling_mfst"; then
	dir="$DEST/dangling"
	mkdir -p "$dir"
	(
		cd "$dir"
		printf '{"schemaVersion":2,"manifests":[{"mediaType":"application/vnd.docker.distribution.manifest.v2+json","digest":"sha256:16d365089e5c10e1673ee82ab5bba38ade9b763296ad918bd24b42a1156c5456","size":264,"annotations":{"org.opencontainers.image.created":"2023-05-19T08:00:44Z"},"platform":{"architecture":"amd64","os":"linux"}}]}' > index.json
		printf '[{"Config":"blobs/sha256/0df1207206e5288f4a989a2f13d1f5b3c4e70467702c1d5d21dfc9f002b7bd43","RepoTags":null,"Layers":null}]' > manifest.json
		mkdir -p blobs/sha256
		printf '{"schemaVersion":2,"mediaType":"application/vnd.docker.distribution.manifest.v2+json","config":{"mediaType":"application/vnd.docker.container.image.v1+json","digest":"sha256:0df1207206e5288f4a989a2f13d1f5b3c4e70467702c1d5d21dfc9f002b7bd43","size":390},"layers":[]}' > blobs/sha256/$dangling_mfst
		printf '{"architecture":"amd64","config":{"Env":["PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin"],"WorkingDir":"/","Labels":{"org.mobyproject.test.specialimage":"1"},"OnBuild":null},"created":null,"history":[{"created_by":"LABEL org.mobyproject.test.specialimage=1","comment":"buildkit.dockerfile.v0","empty_layer":true}],"os":"linux","rootfs":{"type":"layers","diff_ids":null}}' > blobs/sha256/$dangling_cfg
		tar -cf layer.tar --files-from /dev/null
	)
	(
		[ -n "$TESTDEBUG" ] && set -x
		tar -cC "$dir" . | docker load
	)
	rm -rf "$dir"

fi