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{
jq,
lib,
python3,
runCommand,
writeText,
}:
{
closureRoots,
excludePaths ? [ ],
maxLayers ? 100,
fromImage ? null,
debug ? false,
}:
runCommand "layers.json"
{
__structuredAttrs = true;
exportReferencesGraph.graph = closureRoots;
inherit fromImage maxLayers;
nativeBuildInputs = [
jq
python3
];
excludePathsFile = writeText "excludePaths" (lib.concatMapStrings (x: x + "\n") excludePaths);
}
''
# Compute the number of layers that are already used by a potential
# 'fromImage' as well as the customization layer. Ensure that there is
# still at least one layer available to store the image contents.
# one layer will be taken up by the customisation layer
usedLayers=1
if [ -n "$fromImage" ]; then
# subtract number of base image layers
baseImageLayersCount=$(tar -xOf "$fromImage" manifest.json | jq '.[0].Layers | length')
(( usedLayers += baseImageLayersCount ))
fi
if ! (( $usedLayers < $maxLayers )); then
echo >&2 "Error: usedLayers $usedLayers layers to store 'fromImage' and" \
"'extraCommands', but only maxLayers=$maxLayers were" \
"allowed. At least 1 layer is required to store contents."
exit 1
fi
availableLayers=$(( maxLayers - usedLayers ))
jq .graph "$NIX_ATTRS_JSON_FILE" > referencesGraph
${lib.optionalString debug "export DEBUG=1"}
python3 ${./auto-layer.py} referencesGraph $excludePathsFile $availableLayers > $out
''
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