Bugfix: zypper issue with specified package versions (#4421) (#4445)

* fixed issue with specified package versions

zypper.py was doing nothing on state=present, when ALL requestet/checked packages had a specific version stated. This was caused by get_installed_state() being called with an empty package list, which in this case returns information about all ALL installed packages. This lead to an exessive filter list prerun_state, essentially removing all packages that are installed in ANY version on the target system from the request list.

* Create 4421-zypper_package_version_handling_fix

added changelog fragment for #4421

* Delete 4421-zypper_package_version_handling_fix

* Create 4421-zypper_package_version_handling_fix.yml

(cherry picked from commit bbe231e)

Co-authored-by: tover99 <101673769+tover99@users.noreply.github.com>

changelogs/fragments/4421-zypper_package_version_handling_fix.yml

@@ -0,0 +1,2 @@
+bugfixes:
+  - zypper - fixed bug that caused zypper to always report [ok] and do nothing on ``state=present`` when all packages in ``name`` had a version specification (https://github.com/ansible-collections/community.general/issues/4371, https://github.com/ansible-collections/community.general/pull/4421).

plugins/modules/packaging/os/zypper.py

@@ -417,7 +417,9 @@ def package_present(m, name, want_latest):
         # if a version is given leave the package in to let zypper handle the version
         # resolution
         packageswithoutversion = [p for p in packages if not p.version]
-        prerun_state = get_installed_state(m, packageswithoutversion)
+        prerun_state = {}
+        if packageswithoutversion:
+            prerun_state = get_installed_state(m, packageswithoutversion)
         # generate lists of packages to install or remove
         packages = [p for p in packages if p.shouldinstall != (p.name in prerun_state)]