/stdhome

# conflict_walker.py

#

# Copyright (C) 2013 to 2014 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/>.

from walker import Walker

import stdhome.the as the

class ConflictWalker( Walker ):

	"""The conflict walker traverses the repo looking for "deployment conflicts"

	(i.e., changes in the type of file).  This is run prior to running the

	copy-out walker and, as such, is given a list of files that were copied-in

	and which is can, therefore, safely ignore.

	Walker source:       repo

	Walker destination:  home dir

	Walker traversing:   repo

	"""

	def __init__( self, ignore_files, updated_files = None ):

		self.src_dir = the.repo.full_dir

		self.dst_dir = the.full_fsdir

		self.walk_list = updated_files if updated_files is not None else \

						 self.generate_walk_list( the.repo.full_dir )

		self.ignore_files = ignore_files

		self.changed = list()

	def process( self, rel_file, src_file, src_type, dst_file, dst_type ):

		# if entity is missing in home dir, it's ok to copy out (and there's no

		# need to recurse)

		if dst_type == '_': return False

		# if entity was copied-in, it's ok to copy out

		if rel_file in self.ignore_files:

			# we recurse only if this is a directory in the home dir, because if

			# it isn't copying-out will replace whatever's in the home dir with

			# the whole directory from the repo

			return dst_type == 'd'

		# entity has changed type?

		elif src_type != dst_type:

			self.changed.append( "%s (now %s)" % (

				rel_file, self.name_of_type( src_type ) ) )

			# if an entity has changed to/from a directory, we don't care about

			# anything that directory does/did contain

			return False

		# nothing to see here

		return True