[PATCH v2 2/2] rpcctl: Print a message if the user tries to modify a main xprt

[Anna Schumaker <anna@kernel.org>]

From: Anna Schumaker <Anna.Schumaker@Netapp.com>

'main' xprts cannot be set offline or removed, so print a helpful error
message in this case instead of a cryptic 'invalid argument' message.

Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
---
 tools/rpcctl/rpcctl.py | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/tools/rpcctl/rpcctl.py b/tools/rpcctl/rpcctl.py
index 2a69eacd3103..d2110ad6de93 100755
--- a/tools/rpcctl/rpcctl.py
+++ b/tools/rpcctl/rpcctl.py
@@ -90,10 +90,18 @@ class Xprt:
         self.dstaddr = write_addr_file(self.path / "dstaddr", newaddr)
 
     def set_state(self, state):
+        if self.info.get("main_xprt"):
+            raise Exception(f"Main xprts cannot be set {state}")
         with open(self.path / "xprt_state", 'w') as f:
             f.write(state)
         self.read_state()
 
+    def remove(self):
+        if self.info.get("main_xprt"):
+            raise Exception("Main xprts cannot be removed")
+        self.set_state("offline")
+        self.set_state("remove")
+
     def add_command(subparser):
         parser = subparser.add_parser("xprt", help="Commands for individual xprts")
         parser.set_defaults(func=Xprt.show, xprt=None)
@@ -139,8 +147,7 @@ class Xprt:
             if args.property == "dstaddr":
                 xprt.set_dstaddr(socket.gethostbyname(args.newaddr[0]))
             elif args.property == "remove":
-                xprt.set_state("offline")
-                xprt.set_state("remove")
+                xprt.remove()
             else:
                 xprt.set_state(args.property)
         print(xprt)
-- 
2.36.1