Add dry-run option for catchup into help message

Author: dlepikhova

.travis.yml

@@ -36,7 +36,7 @@ env:
     - PG_VERSION=9.5 PG_BRANCH=REL9_5_STABLE
 #    - PG_VERSION=13 PG_BRANCH=REL_13_STABLE PTRACK_PATCH_PG_BRANCH=off MODE=archive
 #    - PG_VERSION=13 PG_BRANCH=REL_13_STABLE PTRACK_PATCH_PG_BRANCH=REL_13_STABLE MODE=backup
-#    - PG_VERSION=13 PG_BRANCH=REL_13_STABLE PTRACK_PATCH_PG_BRANCH=REL_13_STABLE MODE=catchup
+    - PG_VERSION=13 PG_BRANCH=REL_13_STABLE PTRACK_PATCH_PG_BRANCH=REL_13_STABLE MODE=catchup
 #    - PG_VERSION=13 PG_BRANCH=REL_13_STABLE PTRACK_PATCH_PG_BRANCH=off MODE=compression
 #    - PG_VERSION=13 PG_BRANCH=REL_13_STABLE PTRACK_PATCH_PG_BRANCH=off MODE=delta
 #    - PG_VERSION=13 PG_BRANCH=REL_13_STABLE PTRACK_PATCH_PG_BRANCH=off MODE=locking

src/help.c

@@ -1047,6 +1047,7 @@ help_catchup(void)
 	printf(_("                 [--remote-proto] [--remote-host]\n"));
 	printf(_("                 [--remote-port] [--remote-path] [--remote-user]\n"));
 	printf(_("                 [--ssh-options]\n"));
+	printf(_("                 [--dry-run]\n"));
 	printf(_("                 [--help]\n\n"));
 
 	printf(_("  -b, --backup-mode=catchup-mode   catchup mode=FULL|DELTA|PTRACK\n"));
@@ -1081,4 +1082,6 @@ help_catchup(void)
 	printf(_("      --remote-user=username       user name for ssh connection (default: current user)\n"));
 	printf(_("      --ssh-options=ssh_options    additional ssh options (default: none)\n"));
 	printf(_("                                   (example: --ssh-options='-c cipher_spec -F configfile')\n\n"));
+
+	printf(_("      --dry-run                    perform a trial run without any changes\n\n"));
 }

tests/expected/option_help.out

@@ -178,6 +178,7 @@ pg_probackup - utility to manage backup/recovery of PostgreSQL database.
                  [--remote-proto] [--remote-host]
                  [--remote-port] [--remote-path] [--remote-user]
                  [--ssh-options]
+                 [--dry-run]
                  [--help]
 
 Read the website for details. <https://github.com/postgrespro/pg_probackup>