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# copy_base.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/>.
import filecmp, os, shutil
from walker import Walker
import stdhome.the as the
class CopyBaseWalker( Walker ):
"""The copy-base walker traverses a walklist ruthlessly mirroring src to dst.
It is designed to be the base class of both the copy-in and copy-out walker,
both of which are specialisations of this purpose. See them for more
information. The print_op method, derived in those classes, takes, in
addition to the relative filename, a source file type, an operation, and a
sestination file type. Valid file types are f (file), l (symlink), d
(directory) and _ (non-existant). Valid operations are * (modify), = (skip:
same), @ (skip: symlink substitute) and # (skip: ignored).
"""
def __init__( self ):
self.check_src_symlinks = False
self.check_dst_symlinks = False
self.check_dst_ignores = False
def process( self, rel_file, src, dst ):
# ignore?
if self.check_dst_ignores and the.config.ignores.matches( rel_file ):
self.print_op( rel_file, src.type, '#', dst.type )
return True
# src entity is directory
if src.type == 'd':
# if dst entity doesn't exist, create directory (no need to recurse,
# since we're copying the whole directory)
if dst.type == '_':
self.print_op( rel_file, 'd', '*', '_' )
shutil.copytree( src.file, dst.file, True )
# if dst entity is a directory, copy permissions, as required (and
# recurse)
elif dst.type == 'd':
# TODO: should check permission and only do as necessary
self.print_op( rel_file, 'd', '*', 'd' )
shutil.copystat( src.file, dst.file )
return True
# if dst entity is a symlink to a directory, and this is an
# acceptable substitute, just recurse
elif self.check_dst_symlinks and dst.link_type == 'd' and \
the.config.symlinks.matches( rel_file ):
self.print_op( rel_file, 'd', '@', 'd' )
return True
# if dst entity is a file or symlink in home dir, replace it with
# directory (no need to recurse, since we're copying the whole
# directory)
elif dst.type == 'f' or dst.type == 'l':
self.print_op( rel_file, 'd', '*', dst.type )
os.unlink( dst.file )
shutil.copytree( src.file, dst.file, True )
else:
raise NotImplementedError()
# src entity is file
elif src.type == 'f':
# if dst entity doesn't exist, copy file
if dst.type == '_':
self.print_op( rel_file, 'f', '*', '_' )
shutil.copy( src.file, dst.file )
shutil.copystat( src.file, dst.file )
# if dst entity is a file, replace it only if it differs
elif dst.type == 'f':
if not filecmp.cmp( src.file, dst.file ):
self.print_op( rel_file, 'f', '*', 'f' )
os.unlink( dst.file )
shutil.copy( src.file, dst.file )
shutil.copystat( src.file, dst.file )
else:
self.print_op( rel_file, 'f', '=', 'f' )
# if dst entity is a directory, replace it with file
elif dst.type == 'd':
self.print_op( rel_file, 'f', '*', 'd' )
shutil.rmtree( dst.file )
shutil.copy( src.file, dst.file )
shutil.copystat( src.file, dst.file )
# if dst entity is a symlink, replace it with file
elif dst.type == 'l':
self.print_op( rel_file, 'f', '*', 'l' )
os.unlink( dst.file )
shutil.copy( src.file, dst.file )
shutil.copystat( src.file, dst.file )
else:
raise NotImplementedError()
# src entity is a symlink
elif src.type == 'l':
# if dst entity doesn't exist, copy symlink
if dst.type == '_':
self.print_op( rel_file, 'l', '*', '_' )
os.symlink( os.readlink( src.file ), dst.file )
# if dst entity is a symlink, replace it only if it differs
elif dst.type == 'l':
if os.readlink( src.file ) != os.readlink( dst.file ):
self.print_op( rel_file, 'l', '*', 'l' )
os.unlink( dst.file )
os.symlink( os.readlink( src.file ), dst.file )
else:
self.print_op( rel_file, 'l', '=', 'l' )
# if dst entity is a file, replace it with symlink
elif dst.type == 'f':
self.print_op( rel_file, 'l', '*', 'f' )
os.unlink( dst.file )
os.symlink( os.readlink( src.file ), dst.file )
# if dst entity is a directory...
elif dst.type == 'd':
# if src entity is a symlink to a directory, and this is an
# acceptable substitute, just recurse
if self.check_src_symlinks and src.link_type == 'd' and \
the.config.symlinks.matches( rel_file ):
self.print_op( rel_file, 'd', '@', 'd' )
return True
# else replace it with a symlink
self.print_op( rel_file, 'l', '*', 'd' )
shutil.rmtree( dst.file )
os.symlink( os.readlink( src.file ), dst.file )
else:
raise NotImplementedError()
# src entity is missing
elif src.type == '_':
# if dst entity doesn't exist, we're good
if dst.type == '_':
pass;
# if dst entity is a file or symlink, delete it
elif dst.type == 'f' or dst.type == 'l':
self.print_op( rel_file, '_', '*', dst.type )
os.unlink( dst.file )
# if dst entity is a directory, delete it
elif dst.type == 'd':
self.print_op( rel_file, '_', '*', 'd' )
shutil.rmtree( dst.file )
else:
raise NotImplementedError()
# if we got here, we don't want to recurse...
return False
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