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#!/bin/bash
# Usage: combinejars <destination> <jars...>
#
# Combines contents of jars into a single destination jar. The
# destination jar will have all it entries dates set to the unix
# epoch, hence making it reproducible for the same input.
#
# Contents at same paths are overwritten, the latter overwriting the earlier.
destination="$(realpath "$1")"
shift
sources=("$@")
workdir="$(mktemp -d)"
cleanup() {
rm -rf "$workdir"
}
trap cleanup EXIT
for s in "${sources[@]}"; do
absolute=$(realpath "$s")
(cd "$workdir" || exit 1; unzip -uo "$absolute" > /dev/null)
done
find "$workdir" -exec touch -t 197001010000 {} \;
jar -cMf "$destination" -C "$workdir" .
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