[ptxdist] [PATCH 2/3] configure.ac: add check for python 2.x version

[Alexander Aring <alex.aring@gmail.com>]

Signed-off-by: Alexander Aring <alex.aring@gmail.com>
---
We can also check for a python 1.x

I am not a python guru but being to be one. I never saw a python 1.x the last
eight years. I don't know if the current python ipkg scripts can deal with
python 1.x

There exists also a m4 script to check the MAJOR version of python but I see no
m4 directory in ptxdist. I used SED for this which is already checked. And YES
I don't know why but python sends the version string on stderr that's why I add
a redirection from stdout to stderr "2>&1" there.

 configure.ac | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/configure.ac b/configure.ac
index 2a97944..73027c8 100644
--- a/configure.ac
+++ b/configure.ac
@@ -304,6 +304,19 @@ AC_ARG_WITH(python, AS_HELP_STRING([--with-python],[name of the python executabl
 	AC_PATH_PROGS(PYTHON, python2.7 python2.6 python)
 	AC_SUBST(PYTHON)
     ])
+
+dnl
+dnl Check for python 2.x
+dnl
+AC_MSG_CHECKING([python version])
+PYTHON_VERSION=`$PYTHON --version 2>&1 | $SED -ne "1 s/Python \([[0-9]]\)/\1/p"`
+case "$PYTHON_VERSION" in
+3.*) AC_MSG_ERROR([we need at least python 2.x but found $PYTHON_VERSION]) ;;
+2.*) ;;
+*)   AC_MSG_ERROR([we need at least python 2.x]) ;;
+esac
+AC_MSG_RESULT([$PYTHON_VERSION])
+
 dnl
 dnl We need the Python distutils
 dnl
-- 
1.9.2


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