Have detect_os not depend on token count in releasename

src/subscript/runrms/runrms.py

@@ -308,9 +308,14 @@ def detect_os(self):
         """Detect operating system string in runtime, just use default if not found."""
         if RHEL_ID.is_file():
             with open(RHEL_ID, "r", encoding="utf-8") as buffer:
-                major = buffer.read().split(" ")[6].split(".")[0].replace("'", "")
-                self.osver = "x86_64_RH_" + str(major)
-                logger.debug("RHEL version found in %s", RHEL_ID)
+                tokens = buffer.read().split()
+                for t in tokens:
+                    if "." in t:
+                        major = t.split(".")[0]
+                        self.osver = f"x86_64_RH_{major}"
+                        logger.debug("RHEL version found in %s", RHEL_ID)
+                        return
+        raise ValueError("Could not detect RHEL version")
 
     def do_parse_args(self, args):
         """Parse command line args."""

tests/test_runrms.py

@@ -128,7 +128,8 @@ def test_runlogger(tmp_path):
         ("Red Hat Enterprise Linux Server release 6.0 (bar)", "x86_64_RH_6"),
         ("Red Hat Enterprise Linux Server release 7.2 (Maipo)", "x86_64_RH_7"),
         ("Red Hat Enterprise Linux Server release 8.2 (foo)", "x86_64_RH_8"),
-        pytest.param("foobar", None, marks=pytest.mark.xfail(raises=IndexError)),
+        ("Red Hat Enterprise Linux release 8.9 (Ootpa)", "x86_64_RH_8"),
+        pytest.param("foobar", None, marks=pytest.mark.xfail(raises=ValueError)),
     ],
 )
 def test_detect_os(os_id, expected, tmp_path, mocker):