Multiple nomad cli commands fail if there are multiple prefix matches

[henrikjohansen]

Nomad version

Nomad v1.7.8 (but 1.6.x had the same issues)

Issue

Multiple commands in the CLI fail when there are multiple prefixes - so far I have seen this with :

• nomad quota status
• nomad quota inspect
• nomad service info
• nomad volume deregister

.... but I suspect that there may be others.

Reproduction steps

Create a bunch of similarly named quotas / volumes / services and use the above mentioned commands.

Expected Result

The commands should work without giving a "Prefix matched multiple" error

Actual Result

The commands fail with a "Prefix matched multiple" error

[tgross]

@henrikjohansen can you clarify what you steps you're taking here? That is, suppose we have two quotas example1 and example2. If you nomad quota status example, you should get a "prefix matched multiple" error, because there's no way for Nomad to disambiguate these two.

[henrikjohansen]

@tgross ... an example with my v1.8.0 test cluster :

$ nomad quota list
Name           Description
default-quota  Limit the shared default namespace
namespace      Limit the shared default namespace
namespace-1    Limit the shared default namespace
namespace-2    Limit the shared default namespace

Now, looking at the namespace quota fails with :

$ nomad quota status namespace
Prefix matched multiple quotas

Name         Description
namespace    Limit the shared default namespace
namespace-1  Limit the shared default namespace
namespace-2  Limit the shared default namespace

$ nomad quota inspect namespace
Prefix matched multiple quotas

Name         Description
namespace    Limit the shared default namespace
namespace-1  Limit the shared default namespace
namespace-2  Limit the shared default namespace

[henrikjohansen]

As I mentioned other commands have similar issues :

nomad service info seems to be just ... broken (it always gives me an error regardless of how specific I am) :

$ nomad service list | grep liverpro 
liverpro-core             []

$ nomad service info liverpro-core   
Prefix matched multiple services

Service Name              Tags
[... REMOVED ...]

nomad volume deregister shows the same behavior as nomad quota status/inspect demonstrated above - if you have volume, volume-1 and volume-2 it will fail on volume with "Prefix matched multiple" ...

[tgross]

Ok thanks @henrikjohansen. So the problem is when there is an exact match in addition to the multiple prefix matches. That issue was previously reported with CSI volumes #17132, but it looks like it's pervasive.

[henrikjohansen]

I just stumbled across #13920 so it might as well be mentioned here.

[tgross]

PR in progress here: #23502