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hack/ensure-emptyfs: Create dangling image

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Signed-off-by: Paweł Gronowski <pawel.gronowski@docker.com>
(cherry picked from commit 3a31f81838)
Signed-off-by: Paweł Gronowski <pawel.gronowski@docker.com>
This commit is contained in:
Paweł Gronowski 2023-05-22 11:47:28 +02:00
parent 8a4b7c5af8
commit 9ee7d30aef
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1 changed files with 30 additions and 1 deletions
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31
hack/make/.ensure-emptyfs
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@ -1,7 +1,12 @@
#!/usr/bin/env bash
set -e
if ! docker image inspect emptyfs > /dev/null; then
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
@ -24,3 +29,27 @@ if ! docker image inspect emptyfs > /dev/null; then
)
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