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#! @shell@
set -eu
layerNumber=$1
shift
layerPath="./layers/$layerNumber"
echo "Creating layer #$layerNumber for $@"
mkdir -p "$layerPath"
tar --no-recursion -rf "$layerPath/layer.tar" /nix /nix/store
tar -rpf "$layerPath/layer.tar" --hard-dereference --sort=name \
--mtime="@$SOURCE_DATE_EPOCH" \
--owner=0 --group=0 "$@"
# Compute a checksum of the tarball.
tarhash=$(tarsum < $layerPath/layer.tar)
# Add a 'checksum' field to the JSON, with the value set to the
# checksum of the tarball.
cat ./generic.json | jshon -s "$tarhash" -i checksum > $layerPath/json
# Indicate to docker that we're using schema version 1.0.
echo -n "1.0" > $layerPath/VERSION
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