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[Bug 1527149] [NEW] an unclear message returned when update the allocation pool of the subnet for which gateway is disabled

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Public bug reported:

[Summary]
an unclear message returned when update the allocation pool of the subnet for which gateway is disabled 

[Topo]
devstack all-in-one node

[Description and expect result]
should return a clear message and say what really happen about the command

[Reproduceable or not]
reproduceable 

[Recreate Steps]
1) create a subnet :
root@45-59:~# neutron subnet-show sub-1
+-------------------+--------------------------------------------+
| Field             | Value                                      |
+-------------------+--------------------------------------------+
| allocation_pools  | {"start": "1.0.0.100", "end": "1.0.0.200"} |
| cidr              | 1.0.0.0/24                                 |
| dns_nameservers   |                                            |
| enable_dhcp       | True                                       |
| gateway_ip        | 1.0.0.1                                    |
| host_routes       |                                            |
| id                | e9638d41-9346-4887-a27f-87eb12addbf7       |
| ip_version        | 4                                          |
| ipv6_address_mode |                                            |
| ipv6_ra_mode      |                                            |
| name              | sub-1                                      |
| network_id        | 385191ef-3776-4144-9b8b-3e4688d59368       |
| subnetpool_id     |                                            |
| tenant_id         | 6c15aacc1cfe4a9fac35a0c7f8c3e912           |
+-------------------+--------------------------------------------+

2) disable gateway of the subnet:
root@45-59:~# neutron subnet-update --no-gateway sub-1 
Updated subnet: sub-1
root@45-59:~# 
root@45-59:~# 
root@45-59:~# neutron subnet-show sub-1
+-------------------+--------------------------------------------+
| Field             | Value                                      |
+-------------------+--------------------------------------------+
| allocation_pools  | {"start": "1.0.0.100", "end": "1.0.0.200"} |
| cidr              | 1.0.0.0/24                                 |
| dns_nameservers   |                                            |
| enable_dhcp       | True                                       |
| gateway_ip        |                                            |
| host_routes       |                                            |
| id                | e9638d41-9346-4887-a27f-87eb12addbf7       |
| ip_version        | 4                                          |
| ipv6_address_mode |                                            |
| ipv6_ra_mode      |                                            |
| name              | sub-1                                      |
| network_id        | 385191ef-3776-4144-9b8b-3e4688d59368       |
| subnetpool_id     |                                            |
| tenant_id         | 6c15aacc1cfe4a9fac35a0c7f8c3e912           |
+-------------------+--------------------------------------------+

3) update the allocation pool of the subnet, got an unclear message:
root@45-59:~# neutron subnet-update --allocation-pool start=1.0.0.150,end=1.0.0.200 sub-1
failed to detect a valid IP address from None   >>>>ISSUE, unclear
root@45-59:~# 


[Configration]
reproduceable bug, no need

[logs]
reproduceable bug, no need

[Root cause anlyze or debug inf]
reproduceable bug

[Attachment]
None

** Affects: neutron
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1527149

Title:
  an unclear message returned when update the allocation pool of the
  subnet for which gateway is disabled

Status in neutron:
  New

Bug description:
  [Summary]
  an unclear message returned when update the allocation pool of the subnet for which gateway is disabled 

  [Topo]
  devstack all-in-one node

  [Description and expect result]
  should return a clear message and say what really happen about the command

  [Reproduceable or not]
  reproduceable 

  [Recreate Steps]
  1) create a subnet :
  root@45-59:~# neutron subnet-show sub-1
  +-------------------+--------------------------------------------+
  | Field             | Value                                      |
  +-------------------+--------------------------------------------+
  | allocation_pools  | {"start": "1.0.0.100", "end": "1.0.0.200"} |
  | cidr              | 1.0.0.0/24                                 |
  | dns_nameservers   |                                            |
  | enable_dhcp       | True                                       |
  | gateway_ip        | 1.0.0.1                                    |
  | host_routes       |                                            |
  | id                | e9638d41-9346-4887-a27f-87eb12addbf7       |
  | ip_version        | 4                                          |
  | ipv6_address_mode |                                            |
  | ipv6_ra_mode      |                                            |
  | name              | sub-1                                      |
  | network_id        | 385191ef-3776-4144-9b8b-3e4688d59368       |
  | subnetpool_id     |                                            |
  | tenant_id         | 6c15aacc1cfe4a9fac35a0c7f8c3e912           |
  +-------------------+--------------------------------------------+

  2) disable gateway of the subnet:
  root@45-59:~# neutron subnet-update --no-gateway sub-1 
  Updated subnet: sub-1
  root@45-59:~# 
  root@45-59:~# 
  root@45-59:~# neutron subnet-show sub-1
  +-------------------+--------------------------------------------+
  | Field             | Value                                      |
  +-------------------+--------------------------------------------+
  | allocation_pools  | {"start": "1.0.0.100", "end": "1.0.0.200"} |
  | cidr              | 1.0.0.0/24                                 |
  | dns_nameservers   |                                            |
  | enable_dhcp       | True                                       |
  | gateway_ip        |                                            |
  | host_routes       |                                            |
  | id                | e9638d41-9346-4887-a27f-87eb12addbf7       |
  | ip_version        | 4                                          |
  | ipv6_address_mode |                                            |
  | ipv6_ra_mode      |                                            |
  | name              | sub-1                                      |
  | network_id        | 385191ef-3776-4144-9b8b-3e4688d59368       |
  | subnetpool_id     |                                            |
  | tenant_id         | 6c15aacc1cfe4a9fac35a0c7f8c3e912           |
  +-------------------+--------------------------------------------+

  3) update the allocation pool of the subnet, got an unclear message:
  root@45-59:~# neutron subnet-update --allocation-pool start=1.0.0.150,end=1.0.0.200 sub-1
  failed to detect a valid IP address from None   >>>>ISSUE, unclear
  root@45-59:~# 

  
  [Configration]
  reproduceable bug, no need

  [logs]
  reproduceable bug, no need

  [Root cause anlyze or debug inf]
  reproduceable bug

  [Attachment]
  None

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