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
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
|
#!/usr/bin/env python3
# Copyright (C) 2017 Codethink Limited
#
# 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; either
# version 2 of the License, or (at your option) any later version.
#
# This library 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
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public
# License along with this library. If not, see <http://www.gnu.org/licenses/>.
#
# Authors:
# Jonathan Maw <jonathan.maw@codethink.co.uk>
"""A source implementation for staging tar files
**Usage:**
.. code:: yaml
# Specify the tar source kind
kind: tar
# Specify the tar url. Using an alias defined in your project
# configuration is encouraged. 'bst track' will update the
# sha256sum in 'ref' to the downloaded file's sha256sum.
url: upstream:foo.tar
# Specify the ref. It's a sha256sum of the file you download.
ref: 6c9f6f68a131ec6381da82f2bff978083ed7f4f7991d931bfa767b7965ebc94b
# Specify a glob pattern to indicate the base directory to extract
# from the tarball. The first matching directory will be used.
#
# Note that this is '*' by default since most standard release
# tarballs contain a self named subdirectory at the root which
# contains the files one normally wants to extract to build.
#
# To extract the root of the tarball directly, this can be set
# to an empty string.
base-dir: '*'
"""
import os
import tarfile
from buildstream import Source, SourceError
from buildstream import utils
from ._downloadablefilesource import DownloadableFileSource
class TarSource(DownloadableFileSource):
def configure(self, node):
super().configure(node)
self.base_dir = self.node_get_member(node, str, 'base-dir', '*') or None
self.node_validate(node, DownloadableFileSource.COMMON_CONFIG_KEYS + ['base-dir'])
def get_unique_key(self):
return super().get_unique_key() + [self.base_dir]
def stage(self, directory):
try:
with tarfile.open(self._get_mirror_file()) as tar:
base_dir = None
if self.base_dir:
base_dir = self._find_base_dir(tar, self.base_dir)
if base_dir:
tar.extractall(path=directory, members=self._extract_members(tar, base_dir))
else:
tar.extractall(path=directory)
except (tarfile.TarError, OSError) as e:
raise SourceError("{}: Error staging source: {}".format(self, e)) from e
# Override and translate which filenames to extract
def _extract_members(self, tar, base_dir):
if not base_dir.endswith(os.sep):
base_dir = base_dir + os.sep
l = len(base_dir)
for member in tar.getmembers():
if member.path.startswith(base_dir):
member.path = member.path[l:]
yield member
# We want to iterate over all paths of a tarball, but getmembers()
# is not enough because some tarballs simply do not contain the leading
# directory paths for the archived files.
def _list_tar_paths(self, tar, dirs_only=False):
visited = {}
for member in tar.getmembers():
if not member.isdir():
# Loop over the components of a path, for a path of a/b/c/d
# we will first visit 'a', then 'a/b' and then 'a/b/c', excluding
# the final component
components = member.name.split('/')
for i in range(len(components) - 1):
dir_component = '/'.join([components[j] for j in range(i + 1)])
if dir_component not in visited:
visited[dir_component] = True
try:
# Dont yield directory members which actually do
# exist in the archive
_ = tar.getmember(dir_component)
except KeyError:
yield dir_component
continue
# Avoid considering the '.' directory, if any is included in the archive
# this is to avoid the default 'base-dir: *' value behaving differently
# depending on whether the tarball was encoded with a leading '.' or not
elif member.name == '.':
continue
if dirs_only and not member.isdir():
continue
yield member.name
def _find_base_dir(self, tar, pattern):
paths = self._list_tar_paths(tar, dirs_only=True)
matches = sorted(list(utils.glob(paths, pattern)))
if not matches:
raise SourceError("{}: Could not find base directory matching pattern: {}".format(self, pattern))
return matches[0]
def setup():
return TarSource
|
