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63 lines
1.8 KiB
Python
63 lines
1.8 KiB
Python
"""
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Wrap conda commandline program
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"""
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import os
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import subprocess
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import json
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def ensure_conda_env(prefix):
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"""
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Ensure a conda environment in the prefix
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"""
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abspath = os.path.abspath(prefix)
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try:
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output = json.loads(
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subprocess.check_output(['conda', 'create', '--json', '--prefix', abspath]).decode()
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)
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except subprocess.CalledProcessError as e:
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output = json.loads(e.output.decode())
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if 'error' in output and output['error'] == f'CondaValueError: prefix already exists: {abspath}':
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return
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raise
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if 'success' in output and output['success'] == True:
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return
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def ensure_conda_packages(prefix, packages):
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"""
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Ensure packages are installed in the conda prefix.
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"""
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abspath = os.path.abspath(prefix)
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# Let subprocess errors propagate
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# FIXME: raise different exception when using
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raw_output = subprocess.check_output([
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'conda', 'install',
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'--json',
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'--prefix', abspath
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] + packages).decode()
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# `conda install` outputs JSON lines for fetch updates,
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# and a undelimited output at the end. There is no reasonable way to
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# parse this outside of this kludge.
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filtered_output = '\n'.join([
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l for l in raw_output.split('\n')
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# Sometimes the JSON messages start with a \00. The lstrip removes these.
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if not l.lstrip().startswith('{"fetch"')
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])
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output = json.loads(filtered_output)
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if 'success' in output and output['success'] == True:
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return
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def ensure_pip_packages(prefix, packages):
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"""
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Ensure pip packages are installed in the given conda prefix.
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"""
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abspath = os.path.abspath(prefix)
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pip_executable = [os.path.join(abspath, 'bin', 'python'), '-m', 'pip']
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subprocess.run(pip_executable + [
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'install',
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'--no-cache-dir',
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] + packages)
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