[stable-2.7] Prevent duplicate entries in rhsm_repository module (#48107)

* Complie regular expressions for better performance

* Skip on empty lines

This fixes a bug where the previous repo would be inserted in the result twice since an empty line did not match any of the conditions that would exit the loop iteration.
(cherry picked from commit 1e3b704ff1)

Co-authored-by: Sam Doran <sdoran@redhat.com>

changelogs/rhsm_repository-loop-fix-improvements.yaml

@@ -0,0 +1,3 @@
+bugfixes:
+  - rhsm_repository - compile regular expressions to improve performance when looping over available repositories
+  - rhsm_repository - prevent duplicate repository entries from being entered in the final command

lib/ansible/modules/packaging/os/rhsm_repository.py

@@ -115,10 +115,10 @@ def get_repository_list(module, list_parameter):
         '+----------------------------------------------------------+',
         '    Available Repositories in /etc/yum.repos.d/redhat.repo'
     ]
-    repo_id_re_str = r'Repo ID:   (.*)'
-    repo_name_re_str = r'Repo Name: (.*)'
-    repo_url_re_str = r'Repo URL:  (.*)'
-    repo_enabled_re_str = r'Enabled:   (.*)'
+    repo_id_re = re.compile(r'Repo ID:\s+(.*)')
+    repo_name_re = re.compile(r'Repo Name:\s+(.*)')
+    repo_url_re = re.compile(r'Repo URL:\s+(.*)')
+    repo_enabled_re = re.compile(r'Enabled:\s+(.*)')
 
     repo_id = ''
     repo_name = ''
@@ -126,37 +126,38 @@ def get_repository_list(module, list_parameter):
     repo_enabled = ''
 
     repo_result = []
-
-    for line in out.split('\n'):
-        if line in skip_lines:
+    for line in out.splitlines():
+        if line == '' or line in skip_lines:
             continue
 
-        repo_id_re = re.match(repo_id_re_str, line)
-        if repo_id_re:
-            repo_id = repo_id_re.group(1)
+        repo_id_match = repo_id_re.match(line)
+        if repo_id_match:
+            repo_id = repo_id_match.group(1)
             continue
 
-        repo_name_re = re.match(repo_name_re_str, line)
-        if repo_name_re:
-            repo_name = repo_name_re.group(1)
+        repo_name_match = repo_name_re.match(line)
+        if repo_name_match:
+            repo_name = repo_name_match.group(1)
             continue
 
-        repo_url_re = re.match(repo_url_re_str, line)
-        if repo_url_re:
-            repo_url = repo_url_re.group(1)
+        repo_url_match = repo_url_re.match(line)
+        if repo_url_match:
+            repo_url = repo_url_match.group(1)
             continue
 
-        repo_enabled_re = re.match(repo_enabled_re_str, line)
-        if repo_enabled_re:
-            repo_enabled = repo_enabled_re.group(1)
+        repo_enabled_match = repo_enabled_re.match(line)
+        if repo_enabled_match:
+            repo_enabled = repo_enabled_match.group(1)
+
+            repo = {
+                "id": repo_id,
+                "name": repo_name,
+                "url": repo_url,
+                "enabled": True if repo_enabled == '1' else False
+            }
 
-        repo = {
-            "id": repo_id,
-            "name": repo_name,
-            "url": repo_url,
-            "enabled": True if repo_enabled == '1' else False
-        }
         repo_result.append(repo)
+
     return repo_result
 
 
@@ -206,7 +207,7 @@ def repository_modify(module, state, name):
 
     if not module.check_mode:
         rc, out, err = run_subscription_manager(module, rhsm_arguments)
-        results = out.split('\n')
+        results = out.splitlines()
     module.exit_json(results=results, changed=changed, repositories=updated_repo_list, diff=diff)