25 lines
608 B
Bash
25 lines
608 B
Bash
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#!/bin/sh
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set -eu
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layerNumber=$1
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shift
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layerPath="./layers/$layerNumber"
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echo "Creating layer #$layerNumber for $@"
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mkdir -p "$layerPath"
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tar -rpf "$layerPath/layer.tar" --hard-dereference --sort=name \
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--mtime="@$SOURCE_DATE_EPOCH" \
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--owner=0 --group=0 "$@"
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# Compute a checksum of the tarball.
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tarhash=$(tarsum < $layerPath/layer.tar)
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# Add a 'checksum' field to the JSON, with the value set to the
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# checksum of the tarball.
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cat ./generic.json | jshon -s "$tarhash" -i checksum > $layerPath/json
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# Indicate to docker that we're using schema version 1.0.
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echo -n "1.0" > $layerPath/VERSION
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