githooks/commit-msg


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#! /usr/bin/env bash
set -euo pipefail
change_id=$(head -c32 /dev/urandom | git hash-object --stdin)

git interpret-trailers \
    --if-exists doNothing \
    --trailer "Change-Id:I$change_id" \
    "$1" > "$1.tmp"
mv "$1.tmp" "$1"