mirror of
https://github.com/xonsh/xonsh.git
synced 2025-03-04 08:24:40 +01:00
280 lines
8.7 KiB
Python
280 lines
8.7 KiB
Python
"""
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API for Vox, the Python virtual environment manager for xonsh.
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Vox defines several events related to the life cycle of virtual environments:
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* ``vox_on_create(env: str) -> None``
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* ``vox_on_activate(env: str) -> None``
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* ``vox_on_deactivate(env: str) -> None``
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* ``vox_on_delete(env: str) -> None``
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"""
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import os
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import venv
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import shutil
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import builtins
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import collections.abc
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from xonsh.platform import ON_POSIX, ON_WINDOWS, scandir
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# This is because builtins aren't globally created during testing.
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# FIXME: Is there a better way?
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from xonsh.events import events
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events.doc('vox_on_create', """
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vox_on_create(env: str) -> None
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Fired after an environment is created.
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""")
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events.doc('vox_on_activate', """
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vox_on_activate(env: str) -> None
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Fired after an environment is activated.
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""")
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events.doc('vox_on_deactivate', """
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vox_on_deactivate(env: str) -> None
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Fired after an environment is deactivated.
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""")
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events.doc('vox_on_delete', """
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vox_on_delete(env: str) -> None
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Fired after an environment is deleted (through vox).
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""")
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VirtualEnvironment = collections.namedtuple('VirtualEnvironment', ['env', 'bin', 'lib', 'inc'])
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def _mkvenv(env_dir):
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"""
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Constructs a VirtualEnvironment based on the given base path.
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This only cares about the platform. No filesystem calls are made.
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"""
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if ON_WINDOWS:
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binname = os.path.join(env_dir, 'Scripts')
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incpath = os.path.join(env_dir, 'Include')
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libpath = os.path.join(env_dir, 'Lib', 'site-packages')
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elif ON_POSIX:
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binname = os.path.join(env_dir, 'bin')
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incpath = os.path.join(env_dir, 'include')
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libpath = os.path.join(env_dir, 'lib',
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'python%d.%d' % sys.version_info[:2],
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'site-packages')
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else:
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raise OSError('This OS is not supported.')
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return VirtualEnvironment(env_dir, binname, libpath, incpath)
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class EnvironmentInUse(Exception):
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"""The given environment is currently activated, and the operation cannot be performed."""
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class NoEnvironmentActive(Exception):
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"""No environment is currently activated, and the operation cannot be performed."""
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class Vox(collections.abc.Mapping):
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"""API access to Vox and virtual environments, in a dict-like format.
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Makes use of the VirtualEnvironment namedtuple:
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1. ``env``: The full path to the environment
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2. ``bin``: The full path to the bin/Scripts directory of the environment
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"""
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def __init__(self):
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if not builtins.__xonsh_env__.get('VIRTUALENV_HOME'):
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home_path = os.path.expanduser('~')
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self.venvdir = os.path.join(home_path, '.virtualenvs')
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builtins.__xonsh_env__['VIRTUALENV_HOME'] = self.venvdir
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else:
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self.venvdir = builtins.__xonsh_env__['VIRTUALENV_HOME']
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def create(self, name, *, system_site_packages=False, symlinks=False,
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with_pip=True):
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"""Create a virtual environment in $VIRTUALENV_HOME with python3's ``venv``.
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Parameters
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----------
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name : str
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Virtual environment name
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system_site_packages : bool
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If True, the system (global) site-packages dir is available to
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created environments.
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symlinks : bool
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If True, attempt to symlink rather than copy files into virtual
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environment.
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with_pip : bool
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If True, ensure pip is installed in the virtual environment. (Default is True)
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"""
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# NOTE: clear=True is the same as delete then create.
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# NOTE: upgrade=True is its own method
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env_path = os.path.join(self.venvdir, name)
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venv.create(
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env_path,
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system_site_packages=system_site_packages, symlinks=symlinks,
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with_pip=with_pip)
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events.vox_on_create.fire(name)
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def upgrade(self, name, *, symlinks=False, with_pip=True):
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"""Create a virtual environment in $VIRTUALENV_HOME with python3's ``venv``.
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WARNING: If a virtual environment was created with symlinks or without PIP, you must
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specify these options again on upgrade.
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Parameters
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----------
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name : str
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Virtual environment name
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symlinks : bool
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If True, attempt to symlink rather than copy files into virtual
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environment.
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with_pip : bool
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If True, ensure pip is installed in the virtual environment.
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"""
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# venv doesn't reload this, so we have to do it ourselves.
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# Is there a bug for this in Python? There should be.
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env_path, bin_path = self[name]
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cfgfile = os.path.join(env_path, 'pyvenv.cfg')
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cfgops = {}
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with open(cfgfile) as cfgfile:
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for l in cfgfile:
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l = l.strip()
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if '=' not in l:
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continue
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k, v = l.split('=', 1)
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cfgops[k.strip()] = v.strip()
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flags = {
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'system_site_packages': cfgops['include-system-site-packages'] == 'true',
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'symlinks': symlinks,
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'with_pip': with_pip,
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}
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# END things we shouldn't be doing.
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# Ok, do what we came here to do.
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venv.create(env_path, upgrade=True, **flags)
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def __getitem__(self, name):
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"""Get information about a virtual environment.
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Parameters
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----------
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name : str or Ellipsis
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Virtual environment name or absolute path. If ... is given, return
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the current one (throws a KeyError if there isn't one).
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"""
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if name is ...:
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env_path = builtins.__xonsh_env__['VIRTUAL_ENV']
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elif os.path.isabs(name):
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env_path = name
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else:
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env_path = os.path.join(self.venvdir, name)
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ve = _mkvenv(env_path)
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# Actually check if this is an actual venv or just a organizational directory
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# eg, if 'spam/eggs' is a venv, reject 'spam'
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if not os.path.exists(ve.bin):
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raise KeyError()
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return ve
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def __iter__(self):
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"""List available virtual environments found in $VIRTUALENV_HOME.
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"""
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# FIXME: Handle subdirs--this won't discover eg ``spam/eggs``
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for x in scandir(self.venvdir):
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if x.is_dir():
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yield x.name
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def __len__(self):
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"""Counts known virtual environments, using the same rules as iter().
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"""
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l = 0
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for _ in self:
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l += 1
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return l
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def active(self):
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"""Get the name of the active virtual environment.
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You can use this as a key to get further information.
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Returns None if no environment is active.
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"""
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if 'VIRTUAL_ENV' not in builtins.__xonsh_env__:
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return
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env_path = builtins.__xonsh_env__['VIRTUAL_ENV']
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if env_path.startswith(self.venvdir):
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name = env_path[len(self.venvdir):]
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if name[0] in '/\\':
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name = name[1:]
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return name
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else:
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return env_path
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def activate(self, name):
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"""
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Activate a virtual environment.
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Parameters
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----------
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name : str
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Virtual environment name or absolute path.
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"""
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env = builtins.__xonsh_env__
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env_path, bin_path = self[name]
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if 'VIRTUAL_ENV' in env:
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self.deactivate()
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type(self).oldvars = {'PATH': list(env['PATH'])}
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env['PATH'].insert(0, bin_path)
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env['VIRTUAL_ENV'] = env_path
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if 'PYTHONHOME' in env:
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type(self).oldvars['PYTHONHOME'] = env.pop('PYTHONHOME')
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events.vox_on_activate.fire(name)
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def deactivate(self):
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"""
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Deactive the active virtual environment. Returns the name of it.
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"""
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env = builtins.__xonsh_env__
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if 'VIRTUAL_ENV' not in env:
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raise NoEnvironmentActive('No environment currently active.')
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env_path, bin_path = self[...]
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env_name = self.active()
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if hasattr(type(self), 'oldvars'):
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for k, v in type(self).oldvars.items():
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env[k] = v
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del type(self).oldvars
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env.pop('VIRTUAL_ENV')
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events.vox_on_deactivate.fire(env_name)
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return env_name
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def __delitem__(self, name):
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"""
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Permanently deletes a virtual environment.
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Parameters
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----------
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name : str
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Virtual environment name or absolute path.
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"""
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env_path = self[name].env
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try:
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if self[...].env == env_path:
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raise EnvironmentInUse('The "%s" environment is currently active.' % name)
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except KeyError:
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# No current venv, ... fails
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pass
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shutil.rmtree(env_path)
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events.vox_on_delete.fire(name)
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