cfg/bin/ensure-config.sh

#!/usr/bin/env bash
set -euo pipefail

[ ${BASH_VERSINFO[0]:-0} -lt 4 ] && {
	echo "Bash too old, update to >=4.0"
	exit 1
}

SYSTEM=$(uname -s | tr 'A-Z' 'a-z')

FORCE=0
typeset -A REPOS
REPOS=(
	[public]='git@github.com:Luzifer/cfg.git#master'
	[secret]='git@github.com:Luzifer/cfg-secret.git#master'
)

# --- OPT parsing ---

while getopts "f" opt; do
	case "$opt" in
	f)
		FORCE=1
		;;
	esac
done

shift $((OPTIND - 1))
[ "${1:-}" = "--" ] && shift

# --- OPT parsing ---

if [ -e ${HOME}/bin/script_framework.sh ]; then
	source ${HOME}/bin/script_framework.sh
else
	function step() { echo "$@"; }
	function fatal() {
		echo "$@"
		exit 1
	}
fi

function config() {
	git --git-dir="${HOME}/.cfg/${repo_name}" --work-tree="${HOME}" $@
}

for repo_name in "${!REPOS[@]}"; do
	clone_url=$(echo ${REPOS[$repo_name]} | cut -d '#' -f 1)
	branch=$(echo ${REPOS[$repo_name]} | cut -d '#' -f 2)

	step "Working on '${repo_name}' (remote: '${clone_url}', branch: '${branch}'..."

	# Clone repo if it's not already available
	if ! [ -d "${HOME}/.cfg/${repo_name}" ]; then
		git clone --bare "${clone_url}" --branch "${branch}" "${HOME}/.cfg/${repo_name}"
	fi

	# Set basic git options for the repo
	config config status.showUntrackedFiles no

	# Do not overwrite local changes
	if (! config diff --exit-code 2>&1 >/dev/null) && [ ${FORCE} -eq 0 ]; then
		error "Repo '${repo_name}' has unsaved changes and force-flag is not set"
		continue
	fi

	# Refresh latest master
	config fetch -q origin ${branch} || { fatal "Failed to fetch '${repo_name}'"; }

	# Apply latest master
	COMMITS_AHEAD=$(config rev-list --left-right --count FETCH_HEAD...HEAD | awk '{ print $2 }')
	if [ ${COMMITS_AHEAD} -gt 0 ]; then
		echo "Local commits found, trying to rebase..."
		config rebase FETCH_HEAD
	else
		echo "No local commits, resetting to remote master..."
		config reset --hard FETCH_HEAD
	fi

	# Update submodules
	config submodule update --init --recursive
done