Change umask to 0000 when running backup

bin/backup

@@ -28,6 +28,7 @@ import rbackup.rsync
 from rbackup.struct.repository import Repository
 
 # ========== Constants ==========
+SCRIPT_UMASK = 0000
 LOGFORMAT = "==> %(levelname)s %(message)s"
 EXTRA_RSYNC_OPTS = {
     "dry_run": "--dry-run",
@@ -103,6 +104,9 @@ def parse_cmdline_arguments(**kwargs):
 
 # ========== Main Script ==========
 if __name__ == "__main__":
+    # Create some sort of cleanup routine for resetting the umask to previous value
+    old_umask = os.umask(SCRIPT_UMASK)
+
     args = parse_cmdline_arguments()
     parsed_config = config.parse_configfile()
     repo = Repository(args.repository)
@@ -142,10 +146,12 @@ if __name__ == "__main__":
             )
         except ValueError as e:
             syslog.critical(e)
+            os.umask(old_umask)
             exit(E_INVALID_SNAPSHOT_NAME)
         except CalledProcessError as e:
             syslog.critical("Backup process failed")
             syslog.critical(f"Failing command: {e.cmd}")
+            os.umask(old_umask)
             exit(E_FAILED_PROCESS)
 
     repo.symlink_snapshot(curr_snapshot)
@@ -153,3 +159,5 @@ if __name__ == "__main__":
     if args.run_post_sync:
         syslog.info("Running sync operation")
         os.sync()
+
+    os.umask(old_umask)