1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
|
##############################################################################
# Copyright (c) 2013-2016, Lawrence Livermore National Security, LLC.
# Produced at the Lawrence Livermore National Laboratory.
#
# This file is part of Spack.
# Created by Todd Gamblin, tgamblin@llnl.gov, All rights reserved.
# LLNL-CODE-647188
#
# For details, see https://github.com/llnl/spack
# Please also see the LICENSE file for our notice and the LGPL.
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU Lesser General Public License (as
# published by the Free Software Foundation) version 2.1, February 1999.
#
# 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 terms and
# conditions of the GNU Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public
# License along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
##############################################################################
"""LinkTree class for setting up trees of symbolic links."""
import os
import shutil
from llnl.util.filesystem import *
__all__ = ['LinkTree']
empty_file_name = '.spack-empty'
class LinkTree(object):
"""Class to create trees of symbolic links from a source directory.
LinkTree objects are constructed with a source root. Their
methods allow you to create and delete trees of symbolic links
back to the source tree in specific destination directories.
Trees comprise symlinks only to files; directries are never
symlinked to, to prevent the source directory from ever being
modified.
"""
def __init__(self, source_root):
if not os.path.exists(source_root):
raise IOError("No such file or directory: '%s'", source_root)
self._root = source_root
def find_conflict(self, dest_root, **kwargs):
"""Returns the first file in dest that conflicts with src"""
kwargs['follow_nonexisting'] = False
for src, dest in traverse_tree(self._root, dest_root, **kwargs):
if os.path.isdir(src):
if os.path.exists(dest) and not os.path.isdir(dest):
return dest
elif os.path.exists(dest):
return dest
return None
def merge(self, dest_root, **kwargs):
"""Link all files in src into dest, creating directories
if necessary."""
kwargs['order'] = 'pre'
for src, dest in traverse_tree(self._root, dest_root, **kwargs):
if os.path.isdir(src):
if not os.path.exists(dest):
mkdirp(dest)
continue
if not os.path.isdir(dest):
raise ValueError("File blocks directory: %s" % dest)
# mark empty directories so they aren't removed on unmerge.
if not os.listdir(dest):
marker = os.path.join(dest, empty_file_name)
touch(marker)
else:
assert(not os.path.exists(dest))
os.symlink(src, dest)
def unmerge(self, dest_root, **kwargs):
"""Unlink all files in dest that exist in src.
Unlinks directories in dest if they are empty.
"""
kwargs['order'] = 'post'
for src, dest in traverse_tree(self._root, dest_root, **kwargs):
if os.path.isdir(src):
# Skip non-existing links.
if not os.path.exists(dest):
continue
if not os.path.isdir(dest):
raise ValueError("File blocks directory: %s" % dest)
# remove directory if it is empty.
if not os.listdir(dest):
shutil.rmtree(dest, ignore_errors=True)
# remove empty dir marker if present.
marker = os.path.join(dest, empty_file_name)
if os.path.exists(marker):
os.remove(marker)
elif os.path.exists(dest):
if not os.path.islink(dest):
raise ValueError("%s is not a link tree!" % dest)
os.remove(dest)
|
