Add IOCAGE_SKIP environment variable

This allows you to skip the dataset check

iocage/lib/ioc_json.py

@@ -513,6 +513,19 @@ def json_get_value(self, prop, default=False):
                                                "activate with iocage activate "
                                                "POOL")
 
+                    if os.environ["IOCAGE_SKIP"] == "TRUE":
+                        iocage.lib.ioc_common.logit(
+                            {
+                                "level":
+                                "EXCEPTION",
+                                "message":
+                                "IOCAGE_SKIP is TRUE or an RC operation, not"
+                                " activating a pool.\nPlease manually issue"
+                                " iocage activate POOL"
+                            },
+                            _callback=self.callback,
+                            silent=self.silent)
+
                     iocage.lib.ioc_common.logit(
                         {
                             "level":

iocage/main.py

@@ -200,6 +200,7 @@ def cli(version, force):
     """A jail manager."""
     IOCLogger()
     skip_check = False
+    os.environ["IOCAGE_SKIP"] = "FALSE"
     skip_check_cmds = ["--help", "activate", "-v", "--version", "--rc"]
 
     try:
@@ -213,10 +214,12 @@ def cli(version, force):
 
         for arg in sys.argv[1:]:
             if arg in skip_check_cmds:
+                os.environ["IOCAGE_SKIP"] = "TRUE"
                 skip_check = True
             elif "clean" in arg:
                 skip_check = True
                 os.environ["IOCAGE_FORCE"] = "TRUE"
+                os.environ["IOCAGE_SKIP"] = "TRUE"
                 ioc_check.IOCCheck(silent=True)
 
         if not skip_check: