repack.d/generic.sh: install rpm-build-python3 for build packages with python code

repack.d/generic.sh

@@ -3,6 +3,8 @@
 BUILDROOT="$1"
 SPEC="$2"
 
+flag_python3=''
+
 for i in lib/python3 lib/python2.7 ; do
     t=$i
     if [ -d $BUILDROOT/usr/$i/dist-packages ] ; then
@@ -10,3 +12,16 @@ for i in lib/python3 lib/python2.7 ; do
         subst "s|/usr/$i/dist-packages|/usr/$t/site-packages|" $SPEC
     fi
 done
+
+for i in $BUILDROOT/usr/bin/* ; do
+    [ -f "$i" ] || continue
+    grep -q '^#!/usr/bin/python' $i && flag_python3=1
+    subst 's|^#!/usr/bin/python$|#!/usr/bin/python3|' $i
+done
+
+# check for .py scripts
+find $BUILDROOT -name "*.py" | grep -q "\.py$" && flag_python3=1
+
+if [ -n "$flag_python3" ] ; then
+    epm install --skip-installed rpm-build-python3
+fi