configure

#!/usr/bin/env bash

BASEDIR=$(dirname $0)

function main() {
######################################################################

echo
cat <<KEYS
SSH Keys
    A local public/private key pair is used to authenticate with
    Github and other SSH services.
    The files are copied into the local conf directory to be shared
    within the virtual machine. The VM will copy these files into its
    local ~/.ssh directory and set the appropriate permissions to
    make them usable.
    Please note that if your keys require passphrases these will be
    prompted for now and a passphrase-less key will be copied into
    the conf directory.

KEYS

[ -d $BASEDIR/conf/ssh ] || mkdir -p $BASEDIR/vagrant/ssh;

readpath-exists LOCAL_KEY_PRIV "- SSH Private Key" $BASEDIR/vagrant/ssh/id_rsa $BASEDIR/vagrant/ssh/id_dsa ~/.ssh/id_rsa ~/.ssh/id_dsa
readpath-exists LOCAL_KEY_PUB "- SSH Public Key" $BASEDIR/vagrant/ssh/id_rsa.pub $BASEDIR/vagrant/ssh/id_dsa.pub ~/.ssh/id_rsa.pub ~/.ssh/id_dsa.pub

TARGET_KEY_PRIV=$BASEDIR/vagrant/ssh/id_rsa
TARGET_KEY_PUB=$BASEDIR/vagrant/ssh/id_rsa.pub

copy-conf $LOCAL_KEY_PRIV $TARGET_KEY_PRIV
if [ $? -ne 0 ]; then
    echo "Unable to decode key. Check source key passphrase."
    exit 1;
fi

copy-conf $LOCAL_KEY_PUB $TARGET_KEY_PUB

cat <<DONE
That should be everything. If everything went successfully, you can
now use \`vagrant up\` to launch the VM.

DONE

######################################################################
}

function copy-conf() {
	SOURCE=$(realpath $1)
	TARGET=$(realpath $2)
	if [ "$TARGET" ] && [ "$SOURCE" != "$TARGET" ]; then
        ${3:-ln -f} $SOURCE $TARGET
	fi
}

# Usage: readpath VARIABLE PROMPT [DEFAULT [DEFAULT]]
# Doesn't ensure that the user-specified file exists
function readpath() {
	# Extract parameters
	local VARIABLE="$1"
	local PROMPT="$2"
	shift 2
	while [ $# -gt 0 ]; do
		if [ -e $1 ]; then
			local DEFAULT=$1
			break
		fi
		shift
	done
	[ "$DEFAULT" ] && PROMPT="$PROMPT [$DEFAULT]: " || PROMPT="$PROMPT: "
	# Prompt user
	P=
	while [ ! "$P" ]; do
		echo -n "$PROMPT"; read -e P
		[ ! "$P" ] && P="$DEFAULT"
	done
	export $VARIABLE=$(echo $P | sed "s:^~/:$HOME/:")
}

# Usage: readpath-exists VARIABLE PROMPT [DEFAULT]
# Ensures that the returned path exists
function readpath-exists() {
	eval $1=
	while [ ! -e "${!1}" ]; do
		readpath "$@"
	done
}

# realpath shim
[ "$(which realpath)" ] || realpath() {
	if [ ! "$1" ]; then
		pwd; return 0
	elif [ -d $1 ]; then
		BASE=
		DIR=$1
	else
		BASE=$(basename $1)
		DIR=$(dirname $1)
	fi
	if [ ! -e "$DIR" ]; then
		return 1
	fi
	_PWD=$(pwd)
	cd $DIR
	DIR=$(pwd)
	cd $_PWD
	echo $DIR/$BASE
}

main