Configure git email and signing key on a per-repository basis

pre-commit

#!/bin/sh -u

# Install this into ~/.githooks/pre-commit
#
# Make it executable:
#   > chmod +x ~/.githooks/pre-commit
#
# Configure git to point at your hooks directory
#   > git config --global core.hooksPath ~/.githooks
#
# ## Remove your signingkey from global git config
#   > git config --global --unset user.signingkey
#
# ## Tell git to sign commits
#   > git config --global gpg.program gpg2
#   > git config --global commit.gpgsign true
#
# ## Tell Github about your email address
#   https://github.com/settings/emails
#
# ## Tell Github about your OpenPGP key:
#   > gpg --armor --export '<key fingerprint>'
#
# Then copy-paste to here:
#   https://github.com/settings/keys

FLUIDKEYS_REMOTE="git@github.com[:/]fluidkeys/"
FLUIDKEYS_EMAIL="paul@fluidkeys.com"
FLUIDKEYS_KEY="B79F0840DEF12EBBA72FF72D7327A44C2157A758"

PERSONAL_EMAIL="paul@paulfurley.com"
PERSONAL_KEY="A999B7498D1A8DC473E53C92309F635DAD1B5517"

configure_git_local_repo_email() {
	if is_fluidkeys_repo ; then
		COMMAND="git config --local user.email \"${FLUIDKEYS_EMAIL}\""
	else
		COMMAND="git config --local user.email \"${PERSONAL_EMAIL}\""
	fi

	echo
	echo "Email not set for this git repo (.git/config). Running:"
	echo "  > ${COMMAND}"
	echo
	$COMMAND
}

configure_git_local_repo_signing_key() {
	if is_fluidkeys_repo ; then
		COMMAND="git config --local user.signingkey ${FLUIDKEYS_KEY}"
	else
		COMMAND="git config --local user.signingkey ${PERSONAL_KEY}"
	fi

	echo
	echo "Signing key not set for this git repo (.git/config). Running:"
	echo "  > ${COMMAND}"
	echo
	$COMMAND
}

is_fluidkeys_repo() {
	echo $GIT_REMOTE | grep --silent "${FLUIDKEYS_REMOTE}"
	EXIT_CODE="$?"

	if [ "${EXIT_CODE}" -eq "0" ]; then
		# YES, is fluidkeys repo
		return 0
	else
		return 1

	fi
}

GIT_REMOTE="$(git remote get-url origin)"
# TODO: if above fails, just exit 0

REPO_COMMIT_SIGNING_KEY="$(git config --local user.signingkey)"
REPO_COMMIT_EMAIL="$(git config --local user.email)"

REQUIRE_RE_COMMIT="0"

if [ -z "${REPO_COMMIT_EMAIL}" ]; then
	configure_git_local_repo_email
	REQUIRE_RE_COMMIT="1"
fi

if [ -z "${REPO_COMMIT_SIGNING_KEY}" ]; then
	configure_git_local_repo_signing_key
	REQUIRE_RE_COMMIT="1"
fi

if [ "$REQUIRE_RE_COMMIT" -eq "1" ]; then
	MESSAGE_TMPFILE=$(mktemp)
	# echo $COMMIT_MESSAGE > "${MESSAGE_TMPFILE}"

	echo "Commit aborted because email or signing key wasn't set."
	echo "These have now been set, you can commit again."
	exit 1
fi

exit 0