#!/bin/bash
#
# Sets up the /etc directory for git tracking of configuration files
#
# Author: Jason Graham <jgraham@compukix.net>
#
# Usage: git-etc-tracking.sh
#

EDITOR=${EDITOR:-nano}

function config_git {
    local user_name=$(git config --global --get user.name)
    local user_email=$(git config --global --get user.email)

    if [ -z "$user_name" ] || [ -z "$user_email" ]; then
	echo "Set local Git user configuration:"
    fi

    if [ -z "$user_name" ]; then
	user_name=""
	while [ -z "$user_name" ]
	do
	    echo -n "    Name (e.g., Your Name): "
	    read -a user_name
	done
	git config --local user.name "$user_name"
    fi

    if [ -z "$user_email" ]; then
	user_email=""
	while [ -z "$user_email" ]
	do
	    echo -n "    Email (e.g, your@email.com): "
	    read -a user_email
	done
	git config --local user.email "$user_email"
    fi
    
}

function trap_cleanup {
    cleanup
    if [ -d /etc/.git ]; then
	echo "Removing Git repository in /etc/.git"
    fi
    rm -rf /etc/.git /etc/.gitignore
}

function cleanup {
    rm -f /tmp/git-files
}

trap 'trap_cleanup; exit 1' TERM INT

set -e

if (( $UID != 0 )); then
    echo "root privileges required"
    exit 1
fi

cd /etc

find . -not -path '*~' -not -path '*.orig' -not -path '*.new' -not -path '*.save' -not -path '*.archive' -type f > /tmp/git-files
find . -not -path '*~' -not -path '*.orig' -not -path '*.new' -not -path '*.save' -not -path '*.archive' -type l >> /tmp/git-files

echo -n "Review and modify the tracked file list (y/n)? "
read -a ans

if [ $ans == "y" ]; then
    $EDITOR /tmp/git-files
fi

echo -n "Create Git repository (y/n)? "
read -a ans

if [ $ans != "y" ]; then
    cleanup
    exit 0
fi

git init
config_git

cat > .gitignore <<EOF
*~
\#*
*.swp
*.new
*.orig
*.save
EOF
git add .gitignore
git commit -m "Created git repository"

while read f
do
    git add "$f"
done</tmp/git-files

EDITOR=$EDITOR git commit

chmod -R go-rwx .git .gitignore

cleanup