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dockerTools: Preprocess layers list before unpack to handle repeated layers

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This commit is contained in:
Andrew Brooks 2023-02-06 12:19:29 -06:00
parent 298c543e55
commit 84e04ccf85
1 changed files with 12 additions and 3 deletions
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15
pkgs/build-support/docker/default.nix
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@ -229,6 +229,15 @@ rec {
mount /dev/${vmTools.hd} disk
cd disk
function dedup() {
declare -A seen
while read ln; do
if [[ -z "''${seen["$ln"]:-}" ]]; then
echo "$ln"; seen["$ln"]=1
fi
done
}
if [[ -n "$fromImage" ]]; then
echo "Unpacking base image..."
mkdir image
@ -245,7 +254,8 @@ rec {
parentID="$(cat "image/manifest.json" | jq -r '.[0].Config | rtrimstr(".json")')"
fi
cat ./image/manifest.json | jq -r '.[0].Layers | .[]' > layer-list
# In case of repeated layers, unpack only the last occurrence of each
cat ./image/manifest.json | jq -r '.[0].Layers | .[]' | tac | dedup | tac > layer-list
else
touch layer-list
fi
@ -259,14 +269,13 @@ rec {
mkdir -p image/$extractionID/layer
tar -C image/$extractionID/layer -xpf image/$layerTar
rm image/$layerTar
find image/$extractionID/layer -name ".wh.*" -exec bash -c 'name="$(basename {}|sed "s/^.wh.//")"; mknod "$(dirname {})/$name" c 0 0; rm {}' \;
# Get the next lower directory and continue the loop.
lowerdir=image/$extractionID/layer''${lowerdir:+:}$lowerdir
done
# Don't remove tarballs until all unpacked in case some are used more than once
awk '{print "image/"$0}' layer-list | xargs rm -f
mkdir work
mkdir layer