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Tweak two use_pep517 identity checks. (#6135)

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Chris Jerdonek 2019-01-14 23:25:20 -08:00 committed by GitHub
parent 47d7f2b92e
commit 35b1cc1c97
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1 changed files with 7 additions and 4 deletions
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11
src/pip/_internal/pyproject.py
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@ -57,17 +57,20 @@ def load_pyproject_toml(
build_system = None
# The following cases must use PEP 517
# We check for use_pep517 equalling False because that
# means the user explicitly requested --no-use-pep517
# We check for use_pep517 being non-None and falsey because that means
# the user explicitly requested --no-use-pep517. The value 0 as
# opposed to False can occur when the value is provided via an
# environment variable or config file option (due to the quirk of
# strtobool() returning an integer in pip's configuration code).
if has_pyproject and not has_setup:
if use_pep517 is False:
if use_pep517 is not None and not use_pep517:
raise InstallationError(
"Disabling PEP 517 processing is invalid: "
"project does not have a setup.py"
)
use_pep517 = True
elif build_system and "build-backend" in build_system:
if use_pep517 is False:
if use_pep517 is not None and not use_pep517:
raise InstallationError(
"Disabling PEP 517 processing is invalid: "
"project specifies a build backend of {} "