Support excluding certain directories from quota

We have _shared and _shared-public directories that should have
a different quota setup. While we wait for implementation of
a tiered quota config system, this simply allows us to exclude them
from being quota'd

get-quota-your-home/generate.py

@@ -92,7 +92,7 @@ def get_quotas():
     return quotas
 
 
-def reconcile_projfiles(paths, projects_file_path, projid_file_path, min_projid):
+def reconcile_projfiles(paths, projects_file_path, projid_file_path, min_projid, exclude_dirs):
     """
     Make sure each homedir in paths has an appropriate projid entry.
 
@@ -101,9 +101,12 @@ def reconcile_projfiles(paths, projects_file_path, projid_file_path, min_projid)
     """
     # Fetch existing home directories
     # Sort to provide consistent ordering across runs
-    homedirs = sorted(
-        [ent.path for path in paths for ent in os.scandir(path) if ent.is_dir()]
-    )
+    homedirs = []
+    for path in paths:
+        for ent in os.scandir(path):
+            if ent.name not in exclude_dirs and  ent.is_dir():
+                homedirs.append(ent.path)
+
     print(homedirs)
 
     # Fetch list of projects in /etc/projid file, assumed to sync'd to /etc/projects file
@@ -218,6 +221,11 @@ def main():
         type=float,
         help="Hard quota limit (in GB) to set for all home directories",
     )
+    argparser.add_argument(
+        "--exclude",
+        action='append',
+        help='List of directory names to exclude setting quotas on'
+    )
     args = argparser.parse_args()
 
     # xfs_quota reports in kb
@@ -227,7 +235,7 @@ def main():
 
     while True:
         reconcile_projfiles(
-            args.paths, args.projects_file, args.projid_file, args.min_projid
+            args.paths, args.projects_file, args.projid_file, args.min_projid, args.exclude
         )
         reconcile_quotas(args.projid_file, hard_quota_kb)
         time.sleep(args.wait_time)