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docker: generate the image configuration and manifest

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This is required to push images to the Docker registry v2.
This commit is contained in:
Antoine Eiche 2017-07-26 21:53:35 +02:00 committed by Robin Gloster
parent 8a431e13b5
commit 9ee7e8b67e
1 changed files with 13 additions and 1 deletions
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14
pkgs/build-support/docker/default.nix
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@ -6,6 +6,7 @@
findutils, findutils,
go, go,
jshon, jshon,
jq,
lib, lib,
pkgs, pkgs,
pigz, pigz,
@ -408,7 +409,7 @@ rec {
contents runAsRoot diskSize extraCommands; contents runAsRoot diskSize extraCommands;
}; };
result = runCommand "docker-image-${baseName}.tar.gz" { result = runCommand "docker-image-${baseName}.tar.gz" {
buildInputs = [ jshon pigz coreutils findutils ]; buildInputs = [ jshon pigz coreutils findutils jq ];
# Image name and tag must be lowercase # Image name and tag must be lowercase
imageName = lib.toLower name; imageName = lib.toLower name;
imageTag = lib.toLower tag; imageTag = lib.toLower tag;
@ -496,6 +497,17 @@ rec {
# Use the temp folder we've been working on to create a new image. # Use the temp folder we've been working on to create a new image.
mv temp image/$layerID mv temp image/$layerID
# Create image configuration file (used by registry v2) by using
# the configuration of the last layer
SHA_ARRAY=$(find ./ -name layer.tar | xargs sha256sum | cut -d" " -f1 | xargs -I{} echo -n '"sha256:{}" ' | sed 's/" "/","/g' | awk '{ print "["$1"]" }')
jq ". + {\"rootfs\": {\"diff_ids\": $SHA_ARRAY, \"type\": \"layers\"}}" image/$layerID/json > config.json
CONFIG_SHA=$(sha256sum config.json | cut -d ' ' -f1)
mv config.json image/$CONFIG_SHA.json
# Create image manifest
LAYER_PATHS=$(find image/ -name layer.tar -printf '"%P" ' | sed 's/" "/","/g')
jq -n "[{\"Config\":\"$CONFIG_SHA.json\",\"RepoTags\":[\"$imageName:$imageTag\"],\"Layers\":[$LAYER_PATHS]}]" > image/manifest.json
# Store the json under the name image/repositories. # Store the json under the name image/repositories.
jshon -n object \ jshon -n object \
-n object -s "$layerID" -i "$imageTag" \ -n object -s "$layerID" -i "$imageTag" \