| 1 | n/a | """ |
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| 2 | n/a | Virtual environment (venv) package for Python. Based on PEP 405. |
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| 3 | n/a | |
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| 4 | n/a | Copyright (C) 2011-2014 Vinay Sajip. |
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| 5 | n/a | Licensed to the PSF under a contributor agreement. |
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| 6 | n/a | """ |
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| 7 | n/a | import logging |
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| 8 | n/a | import os |
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| 9 | n/a | import shutil |
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| 10 | n/a | import subprocess |
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| 11 | n/a | import sys |
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| 12 | n/a | import types |
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| 13 | n/a | |
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| 14 | n/a | logger = logging.getLogger(__name__) |
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| 15 | n/a | |
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| 16 | n/a | |
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| 17 | n/a | class EnvBuilder: |
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| 18 | n/a | """ |
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| 19 | n/a | This class exists to allow virtual environment creation to be |
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| 20 | n/a | customized. The constructor parameters determine the builder's |
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| 21 | n/a | behaviour when called upon to create a virtual environment. |
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| 22 | n/a | |
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| 23 | n/a | By default, the builder makes the system (global) site-packages dir |
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| 24 | n/a | *un*available to the created environment. |
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| 25 | n/a | |
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| 26 | n/a | If invoked using the Python -m option, the default is to use copying |
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| 27 | n/a | on Windows platforms but symlinks elsewhere. If instantiated some |
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| 28 | n/a | other way, the default is to *not* use symlinks. |
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| 29 | n/a | |
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| 30 | n/a | :param system_site_packages: If True, the system (global) site-packages |
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| 31 | n/a | dir is available to created environments. |
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| 32 | n/a | :param clear: If True, delete the contents of the environment directory if |
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| 33 | n/a | it already exists, before environment creation. |
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| 34 | n/a | :param symlinks: If True, attempt to symlink rather than copy files into |
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| 35 | n/a | virtual environment. |
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| 36 | n/a | :param upgrade: If True, upgrade an existing virtual environment. |
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| 37 | n/a | :param with_pip: If True, ensure pip is installed in the virtual |
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| 38 | n/a | environment |
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| 39 | n/a | :param prompt: Alternative terminal prefix for the environment. |
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| 40 | n/a | """ |
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| 41 | n/a | |
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| 42 | n/a | def __init__(self, system_site_packages=False, clear=False, |
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| 43 | n/a | symlinks=False, upgrade=False, with_pip=False, prompt=None): |
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| 44 | n/a | self.system_site_packages = system_site_packages |
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| 45 | n/a | self.clear = clear |
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| 46 | n/a | self.symlinks = symlinks |
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| 47 | n/a | self.upgrade = upgrade |
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| 48 | n/a | self.with_pip = with_pip |
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| 49 | n/a | self.prompt = prompt |
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| 50 | n/a | |
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| 51 | n/a | def create(self, env_dir): |
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| 52 | n/a | """ |
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| 53 | n/a | Create a virtual environment in a directory. |
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| 54 | n/a | |
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| 55 | n/a | :param env_dir: The target directory to create an environment in. |
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| 56 | n/a | |
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| 57 | n/a | """ |
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| 58 | n/a | env_dir = os.path.abspath(env_dir) |
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| 59 | n/a | context = self.ensure_directories(env_dir) |
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| 60 | n/a | # See issue 24875. We need system_site_packages to be False |
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| 61 | n/a | # until after pip is installed. |
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| 62 | n/a | true_system_site_packages = self.system_site_packages |
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| 63 | n/a | self.system_site_packages = False |
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| 64 | n/a | self.create_configuration(context) |
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| 65 | n/a | self.setup_python(context) |
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| 66 | n/a | if self.with_pip: |
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| 67 | n/a | self._setup_pip(context) |
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| 68 | n/a | if not self.upgrade: |
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| 69 | n/a | self.setup_scripts(context) |
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| 70 | n/a | self.post_setup(context) |
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| 71 | n/a | if true_system_site_packages: |
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| 72 | n/a | # We had set it to False before, now |
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| 73 | n/a | # restore it and rewrite the configuration |
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| 74 | n/a | self.system_site_packages = True |
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| 75 | n/a | self.create_configuration(context) |
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| 76 | n/a | |
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| 77 | n/a | def clear_directory(self, path): |
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| 78 | n/a | for fn in os.listdir(path): |
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| 79 | n/a | fn = os.path.join(path, fn) |
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| 80 | n/a | if os.path.islink(fn) or os.path.isfile(fn): |
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| 81 | n/a | os.remove(fn) |
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| 82 | n/a | elif os.path.isdir(fn): |
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| 83 | n/a | shutil.rmtree(fn) |
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| 84 | n/a | |
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| 85 | n/a | def ensure_directories(self, env_dir): |
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| 86 | n/a | """ |
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| 87 | n/a | Create the directories for the environment. |
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| 88 | n/a | |
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| 89 | n/a | Returns a context object which holds paths in the environment, |
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| 90 | n/a | for use by subsequent logic. |
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| 91 | n/a | """ |
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| 92 | n/a | |
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| 93 | n/a | def create_if_needed(d): |
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| 94 | n/a | if not os.path.exists(d): |
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| 95 | n/a | os.makedirs(d) |
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| 96 | n/a | elif os.path.islink(d) or os.path.isfile(d): |
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| 97 | n/a | raise ValueError('Unable to create directory %r' % d) |
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| 98 | n/a | |
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| 99 | n/a | if os.path.exists(env_dir) and self.clear: |
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| 100 | n/a | self.clear_directory(env_dir) |
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| 101 | n/a | context = types.SimpleNamespace() |
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| 102 | n/a | context.env_dir = env_dir |
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| 103 | n/a | context.env_name = os.path.split(env_dir)[1] |
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| 104 | n/a | prompt = self.prompt if self.prompt is not None else context.env_name |
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| 105 | n/a | context.prompt = '(%s) ' % prompt |
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| 106 | n/a | create_if_needed(env_dir) |
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| 107 | n/a | env = os.environ |
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| 108 | n/a | if sys.platform == 'darwin' and '__PYVENV_LAUNCHER__' in env: |
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| 109 | n/a | executable = os.environ['__PYVENV_LAUNCHER__'] |
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| 110 | n/a | else: |
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| 111 | n/a | executable = sys.executable |
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| 112 | n/a | dirname, exename = os.path.split(os.path.abspath(executable)) |
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| 113 | n/a | context.executable = executable |
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| 114 | n/a | context.python_dir = dirname |
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| 115 | n/a | context.python_exe = exename |
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| 116 | n/a | if sys.platform == 'win32': |
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| 117 | n/a | binname = 'Scripts' |
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| 118 | n/a | incpath = 'Include' |
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| 119 | n/a | libpath = os.path.join(env_dir, 'Lib', 'site-packages') |
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| 120 | n/a | else: |
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| 121 | n/a | binname = 'bin' |
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| 122 | n/a | incpath = 'include' |
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| 123 | n/a | libpath = os.path.join(env_dir, 'lib', |
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| 124 | n/a | 'python%d.%d' % sys.version_info[:2], |
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| 125 | n/a | 'site-packages') |
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| 126 | n/a | context.inc_path = path = os.path.join(env_dir, incpath) |
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| 127 | n/a | create_if_needed(path) |
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| 128 | n/a | create_if_needed(libpath) |
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| 129 | n/a | # Issue 21197: create lib64 as a symlink to lib on 64-bit non-OS X POSIX |
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| 130 | n/a | if ((sys.maxsize > 2**32) and (os.name == 'posix') and |
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| 131 | n/a | (sys.platform != 'darwin')): |
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| 132 | n/a | link_path = os.path.join(env_dir, 'lib64') |
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| 133 | n/a | if not os.path.exists(link_path): # Issue #21643 |
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| 134 | n/a | os.symlink('lib', link_path) |
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| 135 | n/a | context.bin_path = binpath = os.path.join(env_dir, binname) |
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| 136 | n/a | context.bin_name = binname |
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| 137 | n/a | context.env_exe = os.path.join(binpath, exename) |
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| 138 | n/a | create_if_needed(binpath) |
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| 139 | n/a | return context |
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| 140 | n/a | |
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| 141 | n/a | def create_configuration(self, context): |
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| 142 | n/a | """ |
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| 143 | n/a | Create a configuration file indicating where the environment's Python |
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| 144 | n/a | was copied from, and whether the system site-packages should be made |
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| 145 | n/a | available in the environment. |
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| 146 | n/a | |
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| 147 | n/a | :param context: The information for the environment creation request |
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| 148 | n/a | being processed. |
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| 149 | n/a | """ |
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| 150 | n/a | context.cfg_path = path = os.path.join(context.env_dir, 'pyvenv.cfg') |
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| 151 | n/a | with open(path, 'w', encoding='utf-8') as f: |
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| 152 | n/a | f.write('home = %s\n' % context.python_dir) |
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| 153 | n/a | if self.system_site_packages: |
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| 154 | n/a | incl = 'true' |
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| 155 | n/a | else: |
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| 156 | n/a | incl = 'false' |
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| 157 | n/a | f.write('include-system-site-packages = %s\n' % incl) |
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| 158 | n/a | f.write('version = %d.%d.%d\n' % sys.version_info[:3]) |
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| 159 | n/a | |
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| 160 | n/a | if os.name == 'nt': |
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| 161 | n/a | def include_binary(self, f): |
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| 162 | n/a | if f.endswith(('.pyd', '.dll')): |
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| 163 | n/a | result = True |
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| 164 | n/a | else: |
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| 165 | n/a | result = f.startswith('python') and f.endswith('.exe') |
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| 166 | n/a | return result |
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| 167 | n/a | |
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| 168 | n/a | def symlink_or_copy(self, src, dst, relative_symlinks_ok=False): |
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| 169 | n/a | """ |
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| 170 | n/a | Try symlinking a file, and if that fails, fall back to copying. |
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| 171 | n/a | """ |
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| 172 | n/a | force_copy = not self.symlinks |
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| 173 | n/a | if not force_copy: |
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| 174 | n/a | try: |
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| 175 | n/a | if not os.path.islink(dst): # can't link to itself! |
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| 176 | n/a | if relative_symlinks_ok: |
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| 177 | n/a | assert os.path.dirname(src) == os.path.dirname(dst) |
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| 178 | n/a | os.symlink(os.path.basename(src), dst) |
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| 179 | n/a | else: |
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| 180 | n/a | os.symlink(src, dst) |
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| 181 | n/a | except Exception: # may need to use a more specific exception |
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| 182 | n/a | logger.warning('Unable to symlink %r to %r', src, dst) |
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| 183 | n/a | force_copy = True |
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| 184 | n/a | if force_copy: |
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| 185 | n/a | shutil.copyfile(src, dst) |
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| 186 | n/a | |
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| 187 | n/a | def setup_python(self, context): |
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| 188 | n/a | """ |
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| 189 | n/a | Set up a Python executable in the environment. |
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| 190 | n/a | |
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| 191 | n/a | :param context: The information for the environment creation request |
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| 192 | n/a | being processed. |
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| 193 | n/a | """ |
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| 194 | n/a | binpath = context.bin_path |
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| 195 | n/a | path = context.env_exe |
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| 196 | n/a | copier = self.symlink_or_copy |
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| 197 | n/a | copier(context.executable, path) |
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| 198 | n/a | dirname = context.python_dir |
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| 199 | n/a | if os.name != 'nt': |
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| 200 | n/a | if not os.path.islink(path): |
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| 201 | n/a | os.chmod(path, 0o755) |
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| 202 | n/a | for suffix in ('python', 'python3'): |
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| 203 | n/a | path = os.path.join(binpath, suffix) |
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| 204 | n/a | if not os.path.exists(path): |
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| 205 | n/a | # Issue 18807: make copies if |
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| 206 | n/a | # symlinks are not wanted |
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| 207 | n/a | copier(context.env_exe, path, relative_symlinks_ok=True) |
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| 208 | n/a | if not os.path.islink(path): |
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| 209 | n/a | os.chmod(path, 0o755) |
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| 210 | n/a | else: |
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| 211 | n/a | subdir = 'DLLs' |
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| 212 | n/a | include = self.include_binary |
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| 213 | n/a | files = [f for f in os.listdir(dirname) if include(f)] |
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| 214 | n/a | for f in files: |
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| 215 | n/a | src = os.path.join(dirname, f) |
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| 216 | n/a | dst = os.path.join(binpath, f) |
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| 217 | n/a | if dst != context.env_exe: # already done, above |
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| 218 | n/a | copier(src, dst) |
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| 219 | n/a | dirname = os.path.join(dirname, subdir) |
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| 220 | n/a | if os.path.isdir(dirname): |
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| 221 | n/a | files = [f for f in os.listdir(dirname) if include(f)] |
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| 222 | n/a | for f in files: |
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| 223 | n/a | src = os.path.join(dirname, f) |
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| 224 | n/a | dst = os.path.join(binpath, f) |
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| 225 | n/a | copier(src, dst) |
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| 226 | n/a | # copy init.tcl over |
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| 227 | n/a | for root, dirs, files in os.walk(context.python_dir): |
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| 228 | n/a | if 'init.tcl' in files: |
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| 229 | n/a | tcldir = os.path.basename(root) |
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| 230 | n/a | tcldir = os.path.join(context.env_dir, 'Lib', tcldir) |
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| 231 | n/a | if not os.path.exists(tcldir): |
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| 232 | n/a | os.makedirs(tcldir) |
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| 233 | n/a | src = os.path.join(root, 'init.tcl') |
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| 234 | n/a | dst = os.path.join(tcldir, 'init.tcl') |
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| 235 | n/a | shutil.copyfile(src, dst) |
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| 236 | n/a | break |
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| 237 | n/a | |
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| 238 | n/a | def _setup_pip(self, context): |
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| 239 | n/a | """Installs or upgrades pip in a virtual environment""" |
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| 240 | n/a | # We run ensurepip in isolated mode to avoid side effects from |
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| 241 | n/a | # environment vars, the current directory and anything else |
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| 242 | n/a | # intended for the global Python environment |
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| 243 | n/a | cmd = [context.env_exe, '-Im', 'ensurepip', '--upgrade', |
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| 244 | n/a | '--default-pip'] |
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| 245 | n/a | subprocess.check_output(cmd, stderr=subprocess.STDOUT) |
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| 246 | n/a | |
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| 247 | n/a | def setup_scripts(self, context): |
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| 248 | n/a | """ |
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| 249 | n/a | Set up scripts into the created environment from a directory. |
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| 250 | n/a | |
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| 251 | n/a | This method installs the default scripts into the environment |
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| 252 | n/a | being created. You can prevent the default installation by overriding |
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| 253 | n/a | this method if you really need to, or if you need to specify |
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| 254 | n/a | a different location for the scripts to install. By default, the |
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| 255 | n/a | 'scripts' directory in the venv package is used as the source of |
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| 256 | n/a | scripts to install. |
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| 257 | n/a | """ |
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| 258 | n/a | path = os.path.abspath(os.path.dirname(__file__)) |
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| 259 | n/a | path = os.path.join(path, 'scripts') |
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| 260 | n/a | self.install_scripts(context, path) |
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| 261 | n/a | |
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| 262 | n/a | def post_setup(self, context): |
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| 263 | n/a | """ |
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| 264 | n/a | Hook for post-setup modification of the venv. Subclasses may install |
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| 265 | n/a | additional packages or scripts here, add activation shell scripts, etc. |
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| 266 | n/a | |
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| 267 | n/a | :param context: The information for the environment creation request |
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| 268 | n/a | being processed. |
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| 269 | n/a | """ |
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| 270 | n/a | pass |
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| 271 | n/a | |
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| 272 | n/a | def replace_variables(self, text, context): |
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| 273 | n/a | """ |
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| 274 | n/a | Replace variable placeholders in script text with context-specific |
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| 275 | n/a | variables. |
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| 276 | n/a | |
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| 277 | n/a | Return the text passed in , but with variables replaced. |
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| 278 | n/a | |
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| 279 | n/a | :param text: The text in which to replace placeholder variables. |
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| 280 | n/a | :param context: The information for the environment creation request |
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| 281 | n/a | being processed. |
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| 282 | n/a | """ |
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| 283 | n/a | text = text.replace('__VENV_DIR__', context.env_dir) |
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| 284 | n/a | text = text.replace('__VENV_NAME__', context.env_name) |
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| 285 | n/a | text = text.replace('__VENV_PROMPT__', context.prompt) |
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| 286 | n/a | text = text.replace('__VENV_BIN_NAME__', context.bin_name) |
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| 287 | n/a | text = text.replace('__VENV_PYTHON__', context.env_exe) |
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| 288 | n/a | return text |
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| 289 | n/a | |
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| 290 | n/a | def install_scripts(self, context, path): |
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| 291 | n/a | """ |
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| 292 | n/a | Install scripts into the created environment from a directory. |
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| 293 | n/a | |
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| 294 | n/a | :param context: The information for the environment creation request |
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| 295 | n/a | being processed. |
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| 296 | n/a | :param path: Absolute pathname of a directory containing script. |
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| 297 | n/a | Scripts in the 'common' subdirectory of this directory, |
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| 298 | n/a | and those in the directory named for the platform |
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| 299 | n/a | being run on, are installed in the created environment. |
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| 300 | n/a | Placeholder variables are replaced with environment- |
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| 301 | n/a | specific values. |
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| 302 | n/a | """ |
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| 303 | n/a | binpath = context.bin_path |
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| 304 | n/a | plen = len(path) |
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| 305 | n/a | for root, dirs, files in os.walk(path): |
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| 306 | n/a | if root == path: # at top-level, remove irrelevant dirs |
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| 307 | n/a | for d in dirs[:]: |
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| 308 | n/a | if d not in ('common', os.name): |
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| 309 | n/a | dirs.remove(d) |
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| 310 | n/a | continue # ignore files in top level |
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| 311 | n/a | for f in files: |
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| 312 | n/a | srcfile = os.path.join(root, f) |
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| 313 | n/a | suffix = root[plen:].split(os.sep)[2:] |
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| 314 | n/a | if not suffix: |
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| 315 | n/a | dstdir = binpath |
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| 316 | n/a | else: |
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| 317 | n/a | dstdir = os.path.join(binpath, *suffix) |
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| 318 | n/a | if not os.path.exists(dstdir): |
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| 319 | n/a | os.makedirs(dstdir) |
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| 320 | n/a | dstfile = os.path.join(dstdir, f) |
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| 321 | n/a | with open(srcfile, 'rb') as f: |
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| 322 | n/a | data = f.read() |
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| 323 | n/a | if not srcfile.endswith('.exe'): |
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| 324 | n/a | try: |
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| 325 | n/a | data = data.decode('utf-8') |
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| 326 | n/a | data = self.replace_variables(data, context) |
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| 327 | n/a | data = data.encode('utf-8') |
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| 328 | n/a | except UnicodeError as e: |
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| 329 | n/a | data = None |
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| 330 | n/a | logger.warning('unable to copy script %r, ' |
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| 331 | n/a | 'may be binary: %s', srcfile, e) |
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| 332 | n/a | if data is not None: |
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| 333 | n/a | with open(dstfile, 'wb') as f: |
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| 334 | n/a | f.write(data) |
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| 335 | n/a | shutil.copymode(srcfile, dstfile) |
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| 336 | n/a | |
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| 337 | n/a | |
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| 338 | n/a | def create(env_dir, system_site_packages=False, clear=False, |
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| 339 | n/a | symlinks=False, with_pip=False, prompt=None): |
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| 340 | n/a | """Create a virtual environment in a directory.""" |
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| 341 | n/a | builder = EnvBuilder(system_site_packages=system_site_packages, |
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| 342 | n/a | clear=clear, symlinks=symlinks, with_pip=with_pip, |
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| 343 | n/a | prompt=prompt) |
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| 344 | n/a | builder.create(env_dir) |
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| 345 | n/a | |
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| 346 | n/a | def main(args=None): |
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| 347 | n/a | compatible = True |
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| 348 | n/a | if sys.version_info < (3, 3): |
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| 349 | n/a | compatible = False |
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| 350 | n/a | elif not hasattr(sys, 'base_prefix'): |
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| 351 | n/a | compatible = False |
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| 352 | n/a | if not compatible: |
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| 353 | n/a | raise ValueError('This script is only for use with Python >= 3.3') |
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| 354 | n/a | else: |
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| 355 | n/a | import argparse |
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| 356 | n/a | |
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| 357 | n/a | parser = argparse.ArgumentParser(prog=__name__, |
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| 358 | n/a | description='Creates virtual Python ' |
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| 359 | n/a | 'environments in one or ' |
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| 360 | n/a | 'more target ' |
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| 361 | n/a | 'directories.', |
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| 362 | n/a | epilog='Once an environment has been ' |
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| 363 | n/a | 'created, you may wish to ' |
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| 364 | n/a | 'activate it, e.g. by ' |
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| 365 | n/a | 'sourcing an activate script ' |
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| 366 | n/a | 'in its bin directory.') |
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| 367 | n/a | parser.add_argument('dirs', metavar='ENV_DIR', nargs='+', |
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| 368 | n/a | help='A directory to create the environment in.') |
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| 369 | n/a | parser.add_argument('--system-site-packages', default=False, |
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| 370 | n/a | action='store_true', dest='system_site', |
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| 371 | n/a | help='Give the virtual environment access to the ' |
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| 372 | n/a | 'system site-packages dir.') |
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| 373 | n/a | if os.name == 'nt': |
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| 374 | n/a | use_symlinks = False |
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| 375 | n/a | else: |
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| 376 | n/a | use_symlinks = True |
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| 377 | n/a | group = parser.add_mutually_exclusive_group() |
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| 378 | n/a | group.add_argument('--symlinks', default=use_symlinks, |
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| 379 | n/a | action='store_true', dest='symlinks', |
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| 380 | n/a | help='Try to use symlinks rather than copies, ' |
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| 381 | n/a | 'when symlinks are not the default for ' |
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| 382 | n/a | 'the platform.') |
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| 383 | n/a | group.add_argument('--copies', default=not use_symlinks, |
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| 384 | n/a | action='store_false', dest='symlinks', |
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| 385 | n/a | help='Try to use copies rather than symlinks, ' |
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| 386 | n/a | 'even when symlinks are the default for ' |
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| 387 | n/a | 'the platform.') |
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| 388 | n/a | parser.add_argument('--clear', default=False, action='store_true', |
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| 389 | n/a | dest='clear', help='Delete the contents of the ' |
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| 390 | n/a | 'environment directory if it ' |
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| 391 | n/a | 'already exists, before ' |
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| 392 | n/a | 'environment creation.') |
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| 393 | n/a | parser.add_argument('--upgrade', default=False, action='store_true', |
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| 394 | n/a | dest='upgrade', help='Upgrade the environment ' |
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| 395 | n/a | 'directory to use this version ' |
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| 396 | n/a | 'of Python, assuming Python ' |
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| 397 | n/a | 'has been upgraded in-place.') |
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| 398 | n/a | parser.add_argument('--without-pip', dest='with_pip', |
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| 399 | n/a | default=True, action='store_false', |
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| 400 | n/a | help='Skips installing or upgrading pip in the ' |
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| 401 | n/a | 'virtual environment (pip is bootstrapped ' |
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| 402 | n/a | 'by default)') |
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| 403 | n/a | parser.add_argument('--prompt', |
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| 404 | n/a | help='Provides an alternative prompt prefix for ' |
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| 405 | n/a | 'this environment.') |
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| 406 | n/a | options = parser.parse_args(args) |
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| 407 | n/a | if options.upgrade and options.clear: |
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| 408 | n/a | raise ValueError('you cannot supply --upgrade and --clear together.') |
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| 409 | n/a | builder = EnvBuilder(system_site_packages=options.system_site, |
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| 410 | n/a | clear=options.clear, |
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| 411 | n/a | symlinks=options.symlinks, |
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| 412 | n/a | upgrade=options.upgrade, |
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| 413 | n/a | with_pip=options.with_pip, |
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| 414 | n/a | prompt=options.prompt) |
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| 415 | n/a | for d in options.dirs: |
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| 416 | n/a | builder.create(d) |
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| 417 | n/a | |
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| 418 | n/a | if __name__ == '__main__': |
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| 419 | n/a | rc = 1 |
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| 420 | n/a | try: |
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| 421 | n/a | main() |
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| 422 | n/a | rc = 0 |
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| 423 | n/a | except Exception as e: |
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| 424 | n/a | print('Error: %s' % e, file=sys.stderr) |
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| 425 | n/a | sys.exit(rc) |
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