nixpkgs-suyu/pkgs/development/python-modules/pytest-xdist/setup-hook.sh

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pytestXdistHook() {
pytestFlagsArray+=(
"--numprocesses=$NIX_BUILD_CORES"
)
}
# the flags should be added before pytestCheckHook runs so
# until we have dependency mechanism in generic builder, we need to use this ugly hack.
if [ -z "${dontUsePytestXdist-}" ] && [ -z "${dontUsePytestCheck-}" ]; then
if [[ " ${preDistPhases:-} " =~ " pytestCheckPhase " ]]; then
preDistPhases+=" "
preDistPhases="${preDistPhases/ pytestCheckPhase / pytestXdistHook pytestCheckPhase }"
else
preDistPhases+=" pytestXdistHook"
fi
fi