Admission webhook - hierarchical queues can not have hierarchy parts that are a substring [0:i] of other queue hierarchy.

[PigNatovsky]

Description

If I create two queues like these:

---
apiVersion: scheduling.volcano.sh/v1beta1
kind: Queue
metadata:
  name: root-namewithsuffix
  annotations:
    "volcano.sh/hierarchy": "root/namewithsuffix"
    "volcano.sh/hierarchy-weights": "1/1"
spec:
  reclaimable: true
---
apiVersion: scheduling.volcano.sh/v1beta1
kind: Queue
metadata:
  name: root-namewith
  annotations:
    "volcano.sh/hierarchy": "root/namewith"
    "volcano.sh/hierarchy-weights": "1/1"
spec:
  reclaimable: true

Admission webhook throws:

Error from server: error when creating "./local/queues-hdrf.yaml": admission webhook "validatequeue.volcano.sh" denied the request: requestBody.metadata.annotations: Invalid value: "root/namewith": root/namewith is not allowed to be in the sub path of root/namewithsuffix of queue root-namewithsuffix

Steps to reproduce the issue

1. Create queue with an annotation: "volcano.sh/hierarchy": "root/namewithsuffix"
2. Try to create a queue with an annotation: "volcano.sh/hierarchy": "root/namewith"

Describe the results you received and expected

As mentioned, the result is a queue revocation done by the admission webhook. My expectation is that I should be able to create queues like root/someproject and root/someprojectdev.

What version of Volcano are you using?

1.9.0

Any other relevant information

I can pick up this issue, because currently I'm working on admission webhook in our internal env.

[PigNatovsky]

/assign

[PigNatovsky]

I think that issue is here:

volcano/pkg/webhooks/admission/queues/validate/validate_queue.go

Line 157 in 639a4ba

strings.HasPrefix(hierarchyInTree, hierarchy) {

We're just checking if our annotation hierarchy is a substring of other hierarchy, but it's not always a good check, because hierarchy may be at the same length, but with name that contains substring.

[PigNatovsky]

Simple solution: just add a "/" at the end of hierarchy before check.

Example 1:
Queue in the cluster: "root/somename/suffixdev" (because first one was a dev env for this project)
New queue: "root/somename/suffix" (time for a prd queue)

hierarchyInTree: "root/somename/suffixdev"
hierarchy: "root/somename/suffix"

How it works now?
strings.HasPrefix("root/somename/suffixdev", "root/somename/suffix") gives true which throws an error.

How it will work?
strings.HasPrefix("root/somename/suffixdev", "root/somename/suffix/") gives false and accepts queue.

Example 2 (from code comment):
Queue in the cluster: "root/sci/dev"
New queue: "root/sci"

hierarchyInTree: "root/sci/dev"
hierarchy: "root/sci"

How it works now?
strings.HasPrefix("root/sci/dev", "root/sci") gives true and throws an error.

How it will work?
strings.HasPrefix("root/sci/dev", "root/sci") gives true and throws an error (and it should).