provision: Make sure the correct version of pip is installed.
pip 8.0+ is required to successfully run the script (otherwise, the prefix option doesn't work). pip 9.0+ is installed because of the safety features.
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@ -57,8 +57,11 @@ the Python version this command is executed with."""
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# the venv's Python interpreter. `--prefix venv_dir` ensures that all modules are installed
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# the venv's Python interpreter. `--prefix venv_dir` ensures that all modules are installed
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# in the right place.
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# in the right place.
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def install_dependencies(requirements_filename):
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def install_dependencies(requirements_filename):
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if subprocess.call([os.path.join(venv_dir, venv_exec_dir, 'pip'),
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pip_path = os.path.join(venv_dir, venv_exec_dir, 'pip')
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'install', '--prefix', venv_dir, '-r', os.path.join(base_dir, requirements_filename)]):
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# We first install a modern version of pip that supports --prefix
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subprocess.call([pip_path, 'install', 'pip>=9.0'])
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if subprocess.call([pip_path, 'install', '--prefix', venv_dir, '-r',
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os.path.join(base_dir, requirements_filename)]):
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raise OSError("The command `pip install -r {}` failed. Dependencies not installed!"
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raise OSError("The command `pip install -r {}` failed. Dependencies not installed!"
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.format(os.path.join(base_dir, requirements_filename)))
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.format(os.path.join(base_dir, requirements_filename)))
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