python-utils-r1.eclass: Block also pythonX.Y in wrappers

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.

diff --git a/eclass/python-utils-r1.eclass b/eclass/python-utils-r1.eclass
index e3cf82b4b58f698b1d84bb24baaa278748dea004..6bcbe2e5a09f0bdaf5e7db32cde7cf7ef072afdf 100644 (file)
--- 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