juju-git-charm

#!/bin/bash
#
# Copyright 2014 Joshua Strobl <joshua@stroblindustries.com>
#
# juju-git-charm is free software
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software distributed under the
# License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS
# OF ANY KIND, either express or implied. See the License for the specific language governing
# permissions and limitations under the License.

set -e # Stop if anything fails

pluginCommand=$1 # The command that is used (--description, --help, --install or --update)
charmName=$2 # The name of the charm
gitRepo=$3 # The git repository
ubuntuReleaseName=$4 # The Ubuntu release name
gitFolder=$5 # The folder (or sub-sub-sub, etc. folder) in the git repo that holds the Juju charm

if [ ! "$pluginCommand" ]; then # If nothing was specified, output help contents
	pluginCommand="--help"
fi

if [ "$pluginCommand" == "--description" ]; then # If --description is the command
	echo "Clone and keep up-to-date a git repository containing a Juju charm for easy source managing."
	exit 0
fi

if [ "$pluginCommand" == "--help" ]; then # If --help is the command
	echo "Command options: "
	echo "juju-git-charm --install [name] [gitRepo] [ubuntuReleaseName] [gitFolder]"
	echo "git clone [gitRepo] to ~/juju-git-charms/[ubuntuReleaseName]/[name] and either:"
	echo "a) Automatically copy the contents to the equivelant ~/charms/[ubuntuReleaseName]"
	echo "b) Copying the [gitFolder] (and any folders within it, you are allowed to specify a sub-folder) "
	echo "to the equivelant ~/charms/[ubuntuReleaseName] directory"
	echo ""
	echo "juju-git-charm --update [name]"
	echo "Update the charm via git where name is the name of the charm"
	echo "~/charms/[ubuntuReleaseName] directory and/or update any folder that was specified "
	echo "during install."
	exit 0
fi

if [ "$pluginCommand" == "--install" ]; then # If we are installing a Juju charm via git
	if [ ! "$charmName" ]; then # If there is no specified charm name, state error and exit
		echo "Please add a name for the charm and retry the command."
		exit 1
	else
		if [ ! "$gitRepo" ]; then # If there is no specified git repo, state error and exit
			echo "Please add a git repository and retry the command."
			exit 1
		else # If there is a git repo specified
			if [ ! "$ubuntuReleaseName" ]; then # If there is a git repo specified but NO Ubuntu release name, state error and exit
				echo "Please specify the Ubuntu release name (ex. precise, quantal, raring, saucy) and retry the command."
				exit 1
			else # If there is a git repo specified AND an Ubuntu release name
				mkdir -p ~/juju-git-charms # Make the repository within a juju-git-charms folder
				cd ~/juju-git-charms/
				git clone $gitRepo $charmName # Clone the repository

				echo 'ubuntuReleaseName="'$ubuntuReleaseName'"' > ~/juju-git-charms/.$charmName # Add the variable to a "hidden" file

				mkdir -p ~/charms/$ubuntuReleaseName/ # Recursive make the necessary charms folders if they do not exist

				if [ "$gitFolder" != "" ]; then # If a git folder is specified
					echo 'gitFolder="'$gitFolder'"' >> ~/juju-git-charms/.$charmName # Add the variable to the config
					cp -r $gitFolder ~/charms/$ubuntuReleaseName/ # Copy the folder recursively into the charms/ubuntuReleaseName dir
				else # If a git folder is NOT specified
					mkdir -p ~/charms/$ubuntuReleaseName/$charmName # Make a folder with the name of the repo
					cp -r * ~/charms/$ubuntuReleaseName/$charmName # Copy all contents into it
				fi
			fi
		fi
	fi
fi

if [ "$pluginCommand" == "--update" ]; then # If we are updating a git repo
	if [ ! "$charmName" ]; then # If a git repo is NOT specified
		echo "Specify a git repository and retry the command."
		exit 1
	else # If a git repo is specified
		cd ~/juju-git-charms/
		source ~/juju-git-charms/.$charmName # Import the config contents

		cd $charmName
		echo "Updating the git repository..."
		git pull origin master # Update the contents of the git repo
		
		echo "Re-installing the charm"
		if [ "$gitFolder" != "" ]; then # If there IS a gitFolder in the config
			cd ~/charms/$ubuntuReleaseName/$charmName
			rm -rf * # Remove the existing charm
			cd ~/juju-git-charms/$charmName/$gitFolder
			cp -r * ~/charms/$ubuntuReleaseName/$charmName # Add new charm
		else # If there is NOT a gitFolder in the config
			cd ~/charms/$ubuntuReleaseName/$charmName
			rm -rf * # Remove the existing charm (repo)
			cd ~/juju-git-charms/$charmName
			cp -r ~/charms/$ubuntuReleaseName/$charmName# Copy the contents 
		fi
		echo "Update and installation process finished."
		exit 0
	fi
fi