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