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# Canonicalize the manifest & repack with deterministic timestamps.
canonicalizeJar() {
local input='' outer=''
input="$(realpath -sm -- "$1")"
outer="$(pwd)"
# -qq: even quieter
@unzip@ -qq "$input" -d "$input-tmp"
canonicalizeJarManifest "$input-tmp/META-INF/MANIFEST.MF"
# Sets all timestamps to Jan 1 1980, the earliest mtime zips support.
find -- "$input-tmp" -exec touch -t 198001010000.00 {} +
rm "$input"
pushd "$input-tmp" 2>/dev/null
# -q|--quiet, -r|--recurse-paths
# -o|--latest-time: canonicalizes overall archive mtime
# -X|--no-extra: don't store platform-specific extra file attribute fields
@zip@ -qroX "$outer/tmp-out.jar" . 2> /dev/null
popd 2>/dev/null
rm -rf "$input-tmp"
mv "$outer/tmp-out.jar" "$input"
}
# See also the Java specification's JAR requirements:
# https://docs.oracle.com/javase/8/docs/technotes/guides/jar/jar.html#Notes_on_Manifest_and_Signature_Files
canonicalizeJarManifest() {
local input=''
input="$(realpath -sm -- "$1")"
(head -n 1 "$input" && tail -n +2 "$input" | sort | grep -v '^\s*$') > "$input-tmp"
mv "$input-tmp" "$input"
}
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