Remove references to Centos-* distros in 'tests' modules

Tests do not run on Centos-* distros anymore within the CI.

Change-Id: I52950000f97d803f0e8c12d7cb56d5887ccebb2c

tests/composition/conftest.py

@@ -125,7 +125,7 @@ def _run_cron() -> Iterator[None]:
     for cron_cmd in (
         cron_cmds := (
             "cron",  # Ubuntu, Debian, ...
-            "crond",  # RHEL (CentOS, AlmaLinux)
+            "crond",  # RHEL (AlmaLinux)
         )
     ):
         try:

tests/composition/test_automatic_host_removal.py

@@ -17,7 +17,7 @@
 
 @skip_if_saas_edition
 @pytest.mark.xfail(
-    condition=os.getenv("DISTRO") in ("almalinux-9", "centos-8"),
+    condition=os.getenv("DISTRO") == "almalinux-9",
     reason="May fail on EL* systems, investigating.",
 )
 def test_automatic_host_removal(

tests/integration/omd/test_linked_libraries.py

@@ -160,7 +160,7 @@ def test_linked_libraries(site: Site) -> None:
                         # libs found in the seccli directory
                         continue
                     if lib.name == "libnsl.so.1":
-                        # This link is also broken, at least on centos 8. To be investigated.
+                        # This link is also broken. To be investigated.
                         continue
                     assert False, f"seccli file {file} linked to a non-existing library"
 

tests/testlib/utils.py

@@ -431,7 +431,7 @@ def makedirs(path: str | Path, sudo: bool = True, substitute_user: str | None =
 def restart_httpd() -> None:
     """Restart Apache manually on RHEL-based containers.
 
-    On RHEL-based containers, such as CentOS and AlmaLinux, the system Apache is not running.
+    On RHEL-based containers, such as AlmaLinux, the system Apache is not running.
     OMD will not start Apache, if it is not running already.
 
     If a distro uses an `INIT_CMD`, which is not available inside of docker, then the system
@@ -445,7 +445,7 @@ def restart_httpd() -> None:
     """
 
     # When executed locally and un-dockerized, DISTRO may not be set
-    if os.environ.get("DISTRO") in {"centos-8", "almalinux-9"}:
+    if os.environ.get("DISTRO") == "almalinux-9":
         run(["httpd", "-k", "restart"], sudo=True)
 
 

tests/testlib/version.py

@@ -273,12 +273,6 @@ def get_omd_distro_name() -> str:
     rh = Path("/etc/redhat-release")
     if rh.exists():
         content = rh.read_text()
-        if content.startswith("CentOS release 6"):
-            return "el6"
-        if content.startswith("CentOS Linux release 7"):
-            return "el7"
-        if content.startswith("CentOS Linux release 8"):
-            return "el8"
         if content.startswith("AlmaLinux release 9"):
             return "el9"
         raise NotImplementedError()