eclass/python-utils-r1: Sync with Gentoo

It's from Gentoo commit cc63aaba87ed789e8155d0eb1f3f9f2b5a77b67f.

Signed-off-by: Mathieu Tortuyaux <mtortuyaux@microsoft.com>

sdk_container/src/third_party/portage-stable/eclass/python-utils-r1.eclass

@@ -1312,6 +1312,15 @@ _python_check_occluded_packages() {
 # The recommended way to disable it in EAPI 8 or earlier is to set
 # EPYTEST_PLUGINS (possibly to an empty array).
 
+# @ECLASS_VARIABLE: EPYTEST_PLUGIN_LOAD_VIA_ENV
+# @DEFAULT_UNSET
+# @DESCRIPTION:
+# If set to a non-empty value, plugins will be loaded via PYTEST_PLUGINS
+# environment variable rather than explicit "-p" options.  This ensures
+# that plugins are passed down to subprocess, which may be necessary
+# when testing pytest plugins.  However, this is also more likely
+# to cause duplicate plugin errors.
+
 # @FUNCTION: _set_epytest_plugins
 # @INTERNAL
 # @DESCRIPTION:
@@ -1442,20 +1451,41 @@ epytest() {
 
 	if [[ ${PYTEST_DISABLE_PLUGIN_AUTOLOAD} ]]; then
 		if [[ ${EPYTEST_PLUGINS[@]} ]]; then
-			local plugin_args=()
+			if [[ ${EPYTEST_PLUGIN_LOAD_VIA_ENV} ]]; then
-			readarray -t -d '' plugin_args < <(
+				local -x PYTEST_PLUGINS=$(
-				"${EPYTHON}" - "${EPYTEST_PLUGINS[@]}" <<-EOF || die
+					"${EPYTHON}" - "${EPYTEST_PLUGINS[@]}" <<-EOF || die
-					import sys
+						import sys
-					from importlib.metadata import distribution, entry_points
+						from importlib.metadata import distribution, entry_points
-					packages = {distribution(x).name for x in sys.argv[1:]}
+
-					eps = {
+						packages = {distribution(x).name for x in sys.argv[1:]}
-						f"-p{x.name}" for x in entry_points(group="pytest11")
+						# In packages defining multiple entry points, we must
-						if x.dist.name in packages
+						# list them in the same order!
-					}
+						plugins = (
-					sys.stdout.write("\\0".join(sorted(eps)))
+							x.value for x in entry_points(group="pytest11")
-				EOF
+							if x.dist.name in packages
-			)
+						)
-			args+=( "${plugin_args[@]}" )
+						sys.stdout.write(",".join(plugins))
+					EOF
+				)
+			else
+				local plugin_args=()
+				readarray -t -d '' plugin_args < <(
+					"${EPYTHON}" - "${EPYTEST_PLUGINS[@]}" <<-EOF || die
+						import os
+						import sys
+						from importlib.metadata import distribution, entry_points
+
+						env_plugins = os.environ.get("PYTEST_PLUGINS", "").split(",")
+						packages = {distribution(x).name for x in sys.argv[1:]}
+						eps = {
+							f"-p{x.name}" for x in entry_points(group="pytest11")
+							if x.dist.name in packages and x.value not in env_plugins
+						}
+						sys.stdout.write("\\0".join(sorted(eps)))
+					EOF
+				)
+				args+=( "${plugin_args[@]}" )
+			fi
 		fi
 	else
 		args+=(
@@ -1518,6 +1548,17 @@ epytest() {
 		fi
 	fi
 
+	# If we are using hypothesis (require use via EPYTEST_PLUGINS, since
+	# ebuilds may disable autoloading manually) *and* hypothesis-gentoo
+	# is available, use it to disable all health checks, to prevent the tests
+	# from failing randomly under load.
+	if has hypothesis "${EPYTEST_PLUGINS[@]}" &&
+		"${EPYTHON}" -c 'import hypothesis_gentoo' 2>/dev/null &&
+		[[ ! ${HYPOTHESIS_NO_PLUGINS} ]]
+	then
+		args+=( --hypothesis-profile=gentoo )
+	fi
+
 	local x
 	for x in "${EPYTEST_DESELECT[@]}"; do
 		args+=( --deselect "${x}" )
@@ -1527,6 +1568,9 @@ epytest() {
 	done
 	set -- "${EPYTHON}" -m pytest "${args[@]}" "${@}" ${EPYTEST_FLAGS}
 
+	if [[ ${PYTEST_PLUGINS} ]]; then
+		einfo "PYTEST_PLUGINS=${PYTEST_PLUGINS}"
+	fi
 	echo "${@}" >&2
 	"${@}"
 	local ret=${?}