[PATCH 1 of 3 v2] hooks: add intermediate function _get_python_executable

[Thomas De Schampheleire]

# HG changeset patch
# User Thomas De Schampheleire <thomas.de_schampheleire at nokia.com>
# Date 1554320638 -7200
#      Wed Apr 03 21:43:58 2019 +0200
# Branch stable
# Node ID 8d7e20c6980cd4e27eeafa15f574d929d836dd76
# Parent  953047e8c88a9c5ccaa4ddc1bb417622de37f01f
hooks: add intermediate function _get_python_executable

... to avoid code duplication.

diff --git a/kallithea/model/scm.py b/kallithea/model/scm.py
--- a/kallithea/model/scm.py
+++ b/kallithea/model/scm.py
@@ -720,6 +720,10 @@ class ScmModel(object):
 
         return choices, hist_l
 
+    def _get_python_executable(self):
+        """Return a Python executable for use in hooks."""
+        return sys.executable or 'python2'
+
     def install_git_hooks(self, repo, force_create=False):
         """
         Creates a kallithea hook inside a git repository
@@ -734,11 +738,11 @@ class ScmModel(object):
         if not os.path.isdir(loc):
             os.makedirs(loc)
 
-        tmpl_post = "#!/usr/bin/env %s\n" % sys.executable or 'python2'
+        tmpl_post = "#!/usr/bin/env %s\n" % self._get_python_executable()
         tmpl_post += pkg_resources.resource_string(
             'kallithea', os.path.join('config', 'post_receive_tmpl.py')
         )
-        tmpl_pre = "#!/usr/bin/env %s\n" % sys.executable or 'python2'
+        tmpl_pre = "#!/usr/bin/env %s\n" % self._get_python_executable()
         tmpl_pre += pkg_resources.resource_string(
             'kallithea', os.path.join('config', 'pre_receive_tmpl.py')
         )