Merge "Only replace python when re-initializing the venv"

tasks/zaqar_install.yml

@@ -132,11 +132,22 @@
     - zaqar-install
     - zaqar-pip-packages
 
+# NOTE(odyssey4me):
+# We reinitialize the venv to ensure that the right
+# version of python is in the venv, but we do not
+# want virtualenv to also replace pip, setuptools
+# and wheel so we tell it not to.
+# We do not use --always-copy for CentOS/SuSE due
+# to https://github.com/pypa/virtualenv/issues/565
 - name: Update virtualenv path
   shell: |
     find {{ zaqar_bin }} -name \*.pyc -delete
     sed -si '1s/^.*python.*$/#!{{ zaqar_bin | replace ('/','\/') }}\/python/' {{ zaqar_bin }}/*
-    virtualenv {{ zaqar_bin | dirname }}
+    virtualenv {{ zaqar_bin | dirname }} \
+        {{ (ansible_pkg_mgr == 'apt') | ternary('--always-copy', '') }} \
+        --no-pip \
+        --no-setuptools \
+        --no-wheel
   when: zaqar_get_venv | changed
   tags:
     - skip_ansible_lint