/stdhome

To get this branch, use:
bzr branch http://bzr.ed.am/stdhome
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# init.py
#
# Copyright (C) 2013 Tim Marston <tim@edm.am>
#
# This file is part of stdhome (hereafter referred to as "this program").
# See http://ed.am/dev/stdhome for more information.
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.


import sys, os, re, getopt, shutil, subprocess
from command import Command
import stdhome.the as the
from stdhome.deployment import Deployment
from stdhome.subprocess import Popen


class InitCommand( Command ):


	def __init__( self ):
		self.repo = None


	def print_help( self ):
		print "Usage: " + the.program.name + " init [URL] [--repo=REPO]"
		print
		#      01234567890123456789012345678901234567890123456789012345678901234567890123456789
		print "Initialise a local repository."
		print
		print "If an URL is given, the local reposity is a checkout of it (i.e., you can"
		print "receive updates from it and changes you commit will be sent to it).  The URL"
		print "can take the form of a simple hostname, such as \"example.com\", or it can be a"
		print "fully-qualified bazaar URL.  (Actually, in the first case, where it is a simple"
		print "hostname, it is internally expanded to scp://HOSTNAME/~/.stdhome/REPO)."
		print
		print "Options:"
		print "  -r, --repo=REPO  select the repo to check-out or create (defaults to 'home')"
		print "  -v, --verbose    display information about what is being done"
		print "      --help       display help and exit"
		exit( 0 )


	def parse_command_line( self ):
		opts, args = getopt.gnu_getopt(
			sys.argv[ 1: ], "r:v",
			[ "repo=", "verbose", "help" ] )
		for opt, optarg in opts:
			if opt in [ '--repo', '-r' ]:
				if not re.match( '^[-a-zA-z0-9.]+$', optarg ):
					raise the.program.FatalError(
						'invalid repository name: ' + optarg )
				self.repo = optarg
			elif opt in [ '--verbose', '-v' ]:
				the.verbose += 1
			elif opt == "--help":
				self.print_help()
		
		# discard first argument (the command)
		args.pop( 0 )

		# URL argument
		self.url = args[ 0 ].strip() if len( args ) else None

		# remaining arguments
		if len( args ) > 1:
			raise the.program.UsageError( 'too many arguments' )


	def run( self ):

		# set up repo and check it *doesn't* already exists
		the.set_repo( self.repo )
		the.repo.check_dir_exists( False )

		# ensure our top-level directory exists
		if not os.path.exists( the.full_dir ):
			os.mkdir( the.full_dir )

		# checkout a remote repo, or create an empty local one?
		if self.url:

			# expand url if it's a simple hostname
			if re.match( '^[0-9a-zA-z.]+$', self.url ):
				self.url = 'sftp://%s/%s/%s' % \
						   ( self.url, the.dir, the.repo.name )

			# initialise deployment (with an empty repo)
			deployment = Deployment()
			deployment.copy_in()

			# perform bzr checkout
			if the.verbose: print "checking out %s" % the.repo.dir
			try:
				the.repo.vcs.checkout( self.url )
			except Exception as e:

				# attempt to clean-up repo dir
				try:
					shutil.rmtree( the.repo.full_dir )
				except OSError:
					pass

				raise e

			# perform deployment
			try:
				deployment.copy_out()
			except deployment.Conflict as e:
				raise the.program.FatalError( e.msg )

		else:

			# perform bzr init
			if the.verbose: print 'initialising %s' % the.repo.dir
			try:
				the.repo.vcs.init()
			except Exception as e:

				# attempt to clean-up repo dir, and die
				try:
					shutil.rmtree( the.repo.full_dir )
				except OSError:
					pass

				raise e