commit-msg

#!/bin/sh
# This commit-msg git hook enforces the author of a commit signing off on it when not on a branch that contains the word "throwaway".

SIGNOFF_LINE=$(git var GIT_AUTHOR_IDENT | sed -n 's/^\(.*>\).*$/Signed-off-by: \1/p')

echo "Checking for line $SIGNOFF_LINE"

# Check if signoff line is present
if ! grep -qs "^$SIGNOFF_LINE" "$1"; then
	# If line is not present, check if we're on a branch with "throwaway" in it
	echo "Commit is missing a signoff line"
	# exit code 0 if branch, exit code 128 if detached
	BRANCH_NAME=$(git symbolic-ref --short HEAD 2>/dev/null)
	
	if [ $? -eq 0 ]; then
		echo "$BRANCH_NAME" | grep -qs -F 'throwaway'
	 	if [ $? -ne 0 ]; then
			echo "Not on a throwaway branch, failing"
			exit 1
		else
			echo "Exempt: on a throwaway branch"
		fi
	else
		echo "Exempt: HEAD is detached"
	fi
fi