Add comand line parameter and code for testing

Signed-off-by: Robert Spencer <rspencer@lbsd.net>

scripts/backstep-traceback-auto

@@ -40,6 +40,12 @@ group.add_argument("-w", "--weekly", action="store_true", help="Do weekly backup
 parser.add_argument(
     "-o", "--only", help="Only do a backup of the specified lv", metavar="lv_name"
 )
+parser.add_argument(
+    "-t",
+    "--test",
+    action="store_true",
+    help="Don't do anything, only show what would have been run.",
+)
 args = parser.parse_args()
 
 if args.daily:
@@ -50,7 +56,10 @@ else:
     print("error: You need to specify a period [daily or weekly].")
     sys.exit(2)
 
-CONFIG_FILE = "/etc/backstep-traceback/backstep-traceback-auto.ini"
+if not args.test:
+    CONFIG_FILE = "/etc/backstep-traceback/backstep-traceback-auto.ini"
+else:
+    CONFIG_FILE = "backstep-traceback-auto.ini"
 
 if not os.path.exists(CONFIG_FILE):
     print("error: backup is not configured.")
@@ -74,18 +83,20 @@ report_email = config.get(PERIOD, "report_email")
 server_host = config.get(PERIOD, "server_host")
 server_key = config.get(PERIOD, "server_key")
 
-if not os.path.exists(server_key):
-    print("error: " + server_key + " does not exist.")
-    sys.exit(2)
+if not args.test:
+    if not os.path.exists(server_key):
+        print("error: " + server_key + " does not exist.")
+        sys.exit(2)
 
 server_path = config.get(PERIOD, "server_path")
 server_port = config.getint(PERIOD, "server_port")
 server_user = config.get(PERIOD, "server_user")
 zabbix_config = config.get(PERIOD, "zabbix_config")
 
-if not os.path.exists(zabbix_config):
-    print("error: " + zabbix_config + " does not exist.")
-    sys.exit(2)
+if not args.test:
+    if not os.path.exists(zabbix_config):
+        print("error: " + zabbix_config + " does not exist.")
+        sys.exit(2)
 
 if args.verbose:
     syncopts = ["--debug"]
@@ -105,12 +116,15 @@ for lv in ast.literal_eval(config.get(PERIOD, "backup_lvs")):
     bind_mount_args = []
     lvm_snapshot_args = []
 
-    if os.path.exists("/dev/lvm-raid/" + lv):
-        VG = "lvm-raid"
-    elif os.path.exists("/dev/lvm-cache/" + lv):
-        VG = "lvm-cache"
+    if not args.test:
+        if os.path.exists("/dev/lvm-raid/" + lv):
+            VG = "lvm-raid"
+        elif os.path.exists("/dev/lvm-cache/" + lv):
+            VG = "lvm-cache"
+        else:
+            continue
     else:
-        continue
+        VG = "lvm-raid"
 
     if lv == "root":
         bind_mount_args.append("--bind-mount")
@@ -149,4 +163,7 @@ for lv in ast.literal_eval(config.get(PERIOD, "backup_lvs")):
         )
     )
 
-    EXIT_CODE = subprocess.call(command_line)
+    if not args.test:
+        EXIT_CODE = subprocess.call(command_line)
+    else:
+        print(command_line)