1#!/usr/bin/env bash
2#
3# A git commit hook that will automatically append a DCO signoff to the bottom
4# of any commit message that doesn't have one. This append happens after the git
5# default message is generated, but before the user is dropped into the commit
6# message editor.
7#
8# To enable this hook, run `make githooks`, or run the following from the root of
9# the repo.
10#
11#
12# $ ln -s tools/hooks/prepare-commit-msg .git/hooks/prepare-commit-msg
13COMMIT_MESSAGE_FILE="$1"
14AUTHOR=$(git var GIT_AUTHOR_IDENT)
15SIGNOFF=$(echo $AUTHOR | sed -n 's/^\(.*>\).*$/Signed-off-by: \1/p')
16# Check for DCO signoff message. If one doesn't exist, append one and then warn
17# the user that you did so.
18if ! $(grep -qs "^$SIGNOFF" "$COMMIT_MESSAGE_FILE") ; then
19 echo -e "\n$SIGNOFF" >> "$COMMIT_MESSAGE_FILE"
20 echo -e "Appended the following signoff to the end of the commit message:\n $SIGNOFF\n"
21fi
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