blob: 51ce8984e04adcc06898973ddf5294b5f43207b8 (
plain)
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
|
import tempfile
import os
import shutil
import sys
import contextlib
import site
import io
import pkg_resources
@contextlib.contextmanager
def tempdir(cd=lambda dir: None, **kwargs):
temp_dir = tempfile.mkdtemp(**kwargs)
orig_dir = os.getcwd()
try:
cd(temp_dir)
yield temp_dir
finally:
cd(orig_dir)
shutil.rmtree(temp_dir)
@contextlib.contextmanager
def environment(**replacements):
"""
In a context, patch the environment with replacements. Pass None values
to clear the values.
"""
saved = dict(
(key, os.environ[key])
for key in replacements
if key in os.environ
)
# remove values that are null
remove = (key for (key, value) in replacements.items() if value is None)
for key in list(remove):
os.environ.pop(key, None)
replacements.pop(key)
os.environ.update(replacements)
try:
yield saved
finally:
for key in replacements:
os.environ.pop(key, None)
os.environ.update(saved)
@contextlib.contextmanager
def quiet():
"""
Redirect stdout/stderr to StringIO objects to prevent console output from
distutils commands.
"""
old_stdout = sys.stdout
old_stderr = sys.stderr
new_stdout = sys.stdout = io.StringIO()
new_stderr = sys.stderr = io.StringIO()
try:
yield new_stdout, new_stderr
finally:
new_stdout.seek(0)
new_stderr.seek(0)
sys.stdout = old_stdout
sys.stderr = old_stderr
@contextlib.contextmanager
def save_user_site_setting():
saved = site.ENABLE_USER_SITE
try:
yield saved
finally:
site.ENABLE_USER_SITE = saved
@contextlib.contextmanager
def save_pkg_resources_state():
pr_state = pkg_resources.__getstate__()
# also save sys.path
sys_path = sys.path[:]
try:
yield pr_state, sys_path
finally:
sys.path[:] = sys_path
pkg_resources.__setstate__(pr_state)
@contextlib.contextmanager
def suppress_exceptions(*excs):
try:
yield
except excs:
pass
|
