[gentoo-dev] [PATCH] python-utils-r1.eclass: Block also pythonX.Y in wrappers

[Michał Górny]

Improve the wrapper blocking logic to block specific Python versions
as well rather than just 2/3.  In other words, for eselected pythonX.Y
both pythonZ (Z = X^1) and python*.* (!= X.Y) will be blocked.
Hopefully this will catch more build systems that hardcode Python
versions rather than respecting what we're giving them.

This will work only for build systems respecting PATH.  Build systems
(and ebuilds) using /usr/bin path directly will still be able to use
other Python versions.
---
 eclass/python-utils-r1.eclass | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/eclass/python-utils-r1.eclass b/eclass/python-utils-r1.eclass
index e3cf82b4b58f..6bcbe2e5a09f 100644
--- a/eclass/python-utils-r1.eclass
+++ b/eclass/python-utils-r1.eclass
@@ -1043,11 +1043,21 @@ python_wrapper_setup() {
 			nonsupp+=( 2to3 python-config "python${pyver}-config" )
 		fi
 
+		# block all other interpreters as incompatible
+		local orig_EPYTHON=${EPYTHON}
 		local x
+		for x in "${_PYTHON_ALL_IMPLS[@]}"; do
+			python_export "${x}" EPYTHON
+			[[ ${EPYTHON} == ${orig_EPYTHON} ]] && continue
+
+			nonsupp+=( "${EPYTHON}" )
+			[[ ${EPYTHON} == python* ]] && nonsupp+=( "${EPYTHON}-config" )
+		done
+
 		for x in "${nonsupp[@]}"; do
 			cat >"${workdir}"/bin/${x} <<-_EOF_ || die
 				#!/bin/sh
-				echo "${ECLASS}: ${FUNCNAME}: ${x} is not supported by ${EPYTHON} (PYTHON_COMPAT)" >&2
+				echo "${ECLASS}: ${FUNCNAME}: ${x} is not supported by ${orig_EPYTHON} (PYTHON_COMPAT)" >&2
 				exit 127
 			_EOF_
 			chmod +x "${workdir}"/bin/${x} || die
-- 
2.19.0.rc2