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
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
|
from __future__ import annotations
import contextlib
import functools
import os
import sys
from collections.abc import Generator
from collections.abc import Sequence
import pre_commit.constants as C
from pre_commit import lang_base
from pre_commit.envcontext import envcontext
from pre_commit.envcontext import PatchesT
from pre_commit.envcontext import UNSET
from pre_commit.envcontext import Var
from pre_commit.parse_shebang import find_executable
from pre_commit.prefix import Prefix
from pre_commit.util import CalledProcessError
from pre_commit.util import cmd_output
from pre_commit.util import cmd_output_b
from pre_commit.util import win_exe
ENVIRONMENT_DIR = 'py_env'
run_hook = lang_base.basic_run_hook
@functools.cache
def _version_info(exe: str) -> str:
prog = 'import sys;print(".".join(str(p) for p in sys.version_info))'
try:
return cmd_output(exe, '-S', '-c', prog)[1].strip()
except CalledProcessError:
return f'<<error retrieving version from {exe}>>'
def _read_pyvenv_cfg(filename: str) -> dict[str, str]:
ret = {}
with open(filename, encoding='UTF-8') as f:
for line in f:
try:
k, v = line.split('=')
except ValueError: # blank line / comment / etc.
continue
else:
ret[k.strip()] = v.strip()
return ret
def bin_dir(venv: str) -> str:
"""On windows there's a different directory for the virtualenv"""
bin_part = 'Scripts' if sys.platform == 'win32' else 'bin'
return os.path.join(venv, bin_part)
def get_env_patch(venv: str) -> PatchesT:
return (
('PIP_DISABLE_PIP_VERSION_CHECK', '1'),
('PYTHONHOME', UNSET),
('VIRTUAL_ENV', venv),
('PATH', (bin_dir(venv), os.pathsep, Var('PATH'))),
)
def _find_by_py_launcher(
version: str,
) -> str | None: # pragma: no cover (windows only)
if version.startswith('python'):
num = version.removeprefix('python')
cmd = ('py', f'-{num}', '-c', 'import sys; print(sys.executable)')
env = dict(os.environ, PYTHONIOENCODING='UTF-8')
try:
return cmd_output(*cmd, env=env)[1].strip()
except CalledProcessError:
pass
return None
def _find_by_sys_executable() -> str | None:
def _norm(path: str) -> str | None:
_, exe = os.path.split(path.lower())
exe, _, _ = exe.partition('.exe')
if exe not in {'python', 'pythonw'} and find_executable(exe):
return exe
return None
# On linux, I see these common sys.executables:
#
# system `python`: /usr/bin/python -> python2.7
# system `python2`: /usr/bin/python2 -> python2.7
# virtualenv v: v/bin/python (will not return from this loop)
# virtualenv v -ppython2: v/bin/python -> python2
# virtualenv v -ppython2.7: v/bin/python -> python2.7
# virtualenv v -ppypy: v/bin/python -> v/bin/pypy
for path in (sys.executable, os.path.realpath(sys.executable)):
exe = _norm(path)
if exe:
return exe
return None
@functools.lru_cache(maxsize=1)
def get_default_version() -> str: # pragma: no cover (platform dependent)
# First attempt from `sys.executable` (or the realpath)
exe = _find_by_sys_executable()
if exe:
return exe
# Next try the `pythonX.X` executable
exe = f'python{sys.version_info[0]}.{sys.version_info[1]}'
if find_executable(exe):
return exe
if _find_by_py_launcher(exe):
return exe
# We tried!
return C.DEFAULT
def _sys_executable_matches(version: str) -> bool:
if version == 'python':
return True
elif not version.startswith('python'):
return False
try:
info = tuple(int(p) for p in version.removeprefix('python').split('.'))
except ValueError:
return False
return sys.version_info[:len(info)] == info
def norm_version(version: str) -> str | None:
if version == C.DEFAULT: # use virtualenv's default
return None
elif _sys_executable_matches(version): # virtualenv defaults to our exe
return None
if sys.platform == 'win32': # pragma: no cover (windows)
version_exec = _find_by_py_launcher(version)
if version_exec:
return version_exec
# Try looking up by name
version_exec = find_executable(version)
if version_exec and version_exec != version:
return version_exec
# Otherwise assume it is a path
return os.path.expanduser(version)
@contextlib.contextmanager
def in_env(prefix: Prefix, version: str) -> Generator[None, None, None]:
envdir = lang_base.environment_dir(prefix, ENVIRONMENT_DIR, version)
with envcontext(get_env_patch(envdir)):
yield
def health_check(prefix: Prefix, version: str) -> str | None:
envdir = lang_base.environment_dir(prefix, ENVIRONMENT_DIR, version)
pyvenv_cfg = os.path.join(envdir, 'pyvenv.cfg')
# created with "old" virtualenv
if not os.path.exists(pyvenv_cfg):
return 'pyvenv.cfg does not exist (old virtualenv?)'
exe_name = win_exe('python')
py_exe = prefix.path(bin_dir(envdir), exe_name)
cfg = _read_pyvenv_cfg(pyvenv_cfg)
if 'version_info' not in cfg:
return "created virtualenv's pyvenv.cfg is missing `version_info`"
# always use uncached lookup here in case we replaced an unhealthy env
virtualenv_version = _version_info.__wrapped__(py_exe)
if virtualenv_version != cfg['version_info']:
return (
f'virtualenv python version did not match created version:\n'
f'- actual version: {virtualenv_version}\n'
f'- expected version: {cfg["version_info"]}\n'
)
# made with an older version of virtualenv? skip `base-executable` check
if 'base-executable' not in cfg:
return None
base_exe_version = _version_info(cfg['base-executable'])
if base_exe_version != cfg['version_info']:
return (
f'base executable python version does not match created version:\n'
f'- base-executable version: {base_exe_version}\n'
f'- expected version: {cfg["version_info"]}\n'
)
else:
return None
def install_environment(
prefix: Prefix,
version: str,
additional_dependencies: Sequence[str],
) -> None:
envdir = lang_base.environment_dir(prefix, ENVIRONMENT_DIR, version)
venv_cmd = [sys.executable, '-mvirtualenv', envdir]
python = norm_version(version)
if python is not None:
venv_cmd.extend(('-p', python))
install_cmd = ('python', '-mpip', 'install', '.', *additional_dependencies)
cmd_output_b(*venv_cmd, cwd='/')
with in_env(prefix, version):
lang_base.setup_cmd(prefix, install_cmd)
|
