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from contextlib import contextmanager
import tempfile
import subprocess
import venv
class ExtendedEnvBuilder(venv.EnvBuilder):
"""An extended env builder which saves the context, to have access
easily to bin path and such.
"""
def __init__(self, *args, **kwargs):
self.context = None
super(ExtendedEnvBuilder, self).__init__(*args, **kwargs)
def ensure_directories(self, env_dir):
self.context = super(ExtendedEnvBuilder, self).ensure_directories(env_dir)
return self.context
def create(env_dir, system_site_packages=False, clear=False,
symlinks=False, with_pip=False, prompt=None):
"""Create a virtual environment in a directory."""
builder = ExtendedEnvBuilder(system_site_packages=system_site_packages,
clear=clear, symlinks=symlinks, with_pip=with_pip,
prompt=prompt)
builder.create(env_dir)
return builder.context
@contextmanager
def create_venv_with_package(packages):
"""Create a venv with these packages in a temp dir and yielf the env.
packages should be an iterable of pip version instructio (e.g. package~=1.2.3)
"""
with tempfile.TemporaryDirectory() as tempdir:
myenv = create(tempdir, with_pip=True)
pip_call = [
myenv.env_exe,
"-m",
"pip",
"install",
]
subprocess.check_call(pip_call + ['-U', 'pip'])
if packages:
subprocess.check_call(pip_call + packages)
yield myenv
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