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#! /usr/bin/env bash
set -euo pipefail
change_id=$(head -c32 /dev/urandom | git hash-object --stdin)
cut_line='------------------------ >8 ------------------------'
if [ $(< "$1" sed -e "/^# ${cut_line}$/Q" | git stripspace --strip-comments | wc -c) -eq 0 ]; then
# don't inhibit "Aborting commit due to empty commit message"
exit 0
fi
git interpret-trailers \
--if-exists doNothing \
--trailer "Change-Id:I$change_id" \
"$1" > "$1.tmp"
mv "$1.tmp" "$1"
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