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Shell
1234567891011121314151617181920212223242526272829303132333435363738394041424344454647484950515253545556#!/bin/sh# atgc-change-id-hook v1## Stamp a `Change-Id:` trailer on a commit that has none. The id is what a# stacked pull request is matched to its commits by, and it is the one thing# about a commit that survives an amend or a rebase — so it has to be written# when the commit is, not bolted on afterwards by rewriting the branch.## Installed by `atgc repo configure`. Deleting this file is a supported way# to turn it off; atgc reinstalls it only when the slot is empty.## Nothing here prompts, and nothing here fails a commit: every path that# cannot produce an id leaves the message exactly as it found it and exits 0.
msg="$1"[ -n "$msg" ] || exit 0[ -f "$msg" ] || exit 0
# Already carries one. Also covers a commit being amended, whose trailer is# already in the message being re-edited.if grep -qi '^Change-Id:[[:space:]]*I' "$msg"; then exit 0fi
# A fixup or squash belongs to the commit it names, and will be folded into# it: an id of its own would be one more id than there are changes.if head -n 1 "$msg" | grep -qE '^(fixup|squash|amend)! '; then exit 0fi
# An empty message aborts the commit. Stamping one would turn that abort into# a commit whose entire message is a trailer.if [ -z "$(sed -e 's/#.*//' -e '/^[[:space:]]*$/d' "$msg")" ]; then exit 0fi
# Unique, not reproducible: author, time, pid and the message itself. Cut to# the 40 hex digits a change-id is written with, since a repository using# sha256 hashes would otherwise hand back 64.id=$( { git var GIT_AUTHOR_IDENT 2>/dev/null echo "$$" date +%s 2>/dev/null cat "$msg" } | git hash-object --stdin 2>/dev/null | cut -c1-40)[ -n "$id" ] || exit 0
# `interpret-trailers` places it in the trailer block, after a Signed-off-by# and before nothing, and knows about comments and the scissors line — all# the reasons not to append a line by hand here.git interpret-trailers --if-exists doNothing --trailer "Change-Id: I$id" --in-place "$msg" 2>/dev/null
exit 0