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71 lines
2.3 KiB
Python
71 lines
2.3 KiB
Python
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import contextlib
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import logging
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import os
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import subprocess
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import shlex
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import sys
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import sysconfig
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import tempfile
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import venv
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class VirtualEnvironment:
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def __init__(self, prefix, **venv_create_args):
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self._logger = logging.getLogger(self.__class__.__name__)
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venv.create(prefix, **venv_create_args)
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self._prefix = prefix
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self._paths = sysconfig.get_paths(
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scheme='venv',
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vars={'base': self.prefix},
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expand=True,
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)
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@classmethod
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@contextlib.contextmanager
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def from_tmpdir(cls, *, prefix=None, dir=None, **venv_create_args):
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delete = not bool(os.environ.get('PYTHON_TESTS_KEEP_VENV'))
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with tempfile.TemporaryDirectory(prefix=prefix, dir=dir, delete=delete) as tmpdir:
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yield cls(tmpdir, **venv_create_args)
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@property
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def prefix(self):
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return self._prefix
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@property
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def paths(self):
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return self._paths
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@property
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def interpreter(self):
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return os.path.join(self.paths['scripts'], os.path.basename(sys.executable))
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def _format_output(self, name, data, indent='\t'):
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if not data:
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return indent + f'{name}: (none)'
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if len(data.splitlines()) == 1:
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return indent + f'{name}: {data}'
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else:
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prefixed_lines = '\n'.join(indent + '> ' + line for line in data.splitlines())
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return indent + f'{name}:\n' + prefixed_lines
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def run(self, *args, **subprocess_args):
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if subprocess_args.get('shell'):
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raise ValueError('Running the subprocess in shell mode is not supported.')
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default_args = {
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'capture_output': True,
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'check': True,
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}
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try:
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result = subprocess.run([self.interpreter, *args], **default_args | subprocess_args)
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except subprocess.CalledProcessError as e:
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if e.returncode != 0:
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self._logger.error(
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f'Interpreter returned non-zero exit status {e.returncode}.\n'
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+ self._format_output('COMMAND', shlex.join(e.cmd)) + '\n'
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+ self._format_output('STDOUT', e.stdout.decode()) + '\n'
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+ self._format_output('STDERR', e.stderr.decode()) + '\n'
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)
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raise
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else:
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return result
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