def _pip_install_via_requirements(prefix, specs, args, *_, **kwargs):
"""
Installs the pip dependencies in specs using a temporary pip requirements file.
Args
----
prefix: string
The path to the python and pip executables.
specs: iterable of strings
Each element should be a valid pip dependency.
See: https://pip.pypa.io/en/stable/user_guide/#requirements-files
https://pip.pypa.io/en/stable/reference/pip_install/#requirements-file-format
"""
url_scheme = args.file.split("://", 1)[0]
if url_scheme in CONDA_SESSION_SCHEMES:
pip_workdir = None
else:
try:
pip_workdir = op.dirname(op.abspath(args.file))
except AttributeError:
pip_workdir = None
requirements = None
try:
# Generate the temporary requirements file
requirements = Utf8NamedTemporaryFile(mode='w',
prefix='condaenv.',
suffix='.requirements.txt',
dir=pip_workdir,
delete=False)
requirements.write('\n'.join(specs))
requirements.close()
# pip command line...
pip_cmd = ['install', '-U', '-r', requirements.name]
stdout, stderr = pip_subprocess(pip_cmd, prefix, cwd=pip_workdir)
finally:
# Win/Appveyor does not like it if we use context manager + delete=True.
# So we delete the temporary file in a finally block.
if requirements is not None and op.isfile(requirements.name):
if 'CONDA_TEST_SAVE_TEMPS' not in os.environ:
os.remove(requirements.name)
else:
log.warning(
'CONDA_TEST_SAVE_TEMPS :: retaining pip requirements.txt {}'
.format(requirements.name))
return get_pip_installed_packages(stdout)
def test_get_pip_installed_packages_none(pip_output):
result = get_pip_installed_packages(pip_output)
assert result is None
def test_get_pip_installed_packages(pip_output, expected):
result = get_pip_installed_packages(pip_output)
assert result == expected