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dockerTools: take a list of images in mergeImages

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This commit is contained in:
Viktor Kronvall 2021-03-30 18:31:25 +09:00
parent ecc293ff7a
commit dcc9aef015
1 changed files with 16 additions and 17 deletions
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33
pkgs/build-support/docker/default.nix
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@ -682,27 +682,26 @@ rec {
in in
result; result;
# Merge the tarballs of two images built with buildImage into a single # Merge the tarballs of images built with buildImage into a single
# tarball that contains both images. Running `docker load` on the resulting # tarball that contains all images. Running `docker load` on the resulting
# tarball with load both images into the docker daemon. # tarball will load the images into the docker daemon.
mergeImages = a: b: runCommand "merge-docker-images" mergeImages = images: runCommand "merge-docker-images"
{ {
inherit images;
nativeBuildInputs = [ pigz jq ]; nativeBuildInputs = [ pigz jq ];
} '' } ''
mkdir a b image mkdir image inputs
# Extract images # Extract images
tar -I pigz -xf ${a} -C a for item in $images; do
tar -I pigz -xf ${b} -C b mkdir inputs/$(basename $item)
# Make writable (to enable mv) tar -I pigz -xf $item -C inputs/$(basename $item)
chmod -R +w a b done
# Merge repositories objects (image:tag -> hash) # Copy all layers from input images to output image directory
jq -s add a/repositories b/repositories > repositories cp -R --no-clobber inputs/*/* image/
# Merge docker images manifests ([image]) # Merge repositories objects and manifests
jq -s add a/manifest.json b/manifest.json > manifest.json jq -s add inputs/*/repositories > repositories
# Move layers to output directory jq -s add inputs/*/manifest.json > manifest.json
mv --no-clobber a/* image/ # Replace output image repositories and manifest with merged versions
mv --no-clobber b/* image/
# Move merged repositories object and manifest list to output directory
mv repositories image/repositories mv repositories image/repositories
mv manifest.json image/manifest.json mv manifest.json image/manifest.json
# Create tarball and gzip # Create tarball and gzip