Fix panic when webhook specifies a rendering template via ConfigMap

[yuguorui]

What type of PR is this?
PR类型是什么？
/kind bug

What this PR does / why we need it:
这个PR解决了什么问题:
Fix panic when webhook sinks specifies a rendering template via ConfigMap

Which issue(s) this PR fixes:
PR相关联issue:

Fixes #

Does this PR introduce a breaking change?:
PR带来的破坏性变更:
NONE

Test/Final result:
测试/最终运行结果:

[Copilot]

Pull Request Overview

This PR fixes a panic that occurs when webhook sinks specify a rendering template via ConfigMap by adding nil checks for the URI parameter in the Kubernetes client configuration functions.

Key Changes:

• Added nil check for URI parameter before accessing its properties to prevent panic
• Modified client singleton retrieval logic to handle nil URI cases
• Fixed minor formatting issue in Dockerfile

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

File	Description
deploy/Dockerfile	Added missing -y flag to apt-get install command for consistency
common/kubernetes/configs.go	Added nil checks for URI parameter to prevent panic when webhook uses ConfigMap templates

Comments suppressed due to low confidence (3)

common/kubernetes/configs.go:96

• The code accesses configOverrides.ClusterInfo.Server without checking if configOverrides is nil. When uri is nil, configOverrides remains nil (as initialized on line 71), which will cause a panic. Add a nil check for configOverrides before accessing its fields.

		if configOverrides.ClusterInfo.Server != "" {

common/kubernetes/configs.go:101

• These lines access configOverrides fields without a nil check. When uri is nil, configOverrides will be nil, causing a panic. Wrap these accesses in a nil check for configOverrides.

		kubeConfig.Insecure = configOverrides.ClusterInfo.InsecureSkipTLSVerify
		if configOverrides.ClusterInfo.InsecureSkipTLSVerify {

common/kubernetes/configs.go:1

• The code accesses configOverrides.ClusterInfo fields without checking if configOverrides is nil. When uri is nil, this will cause a panic. Add appropriate nil checks or provide default values when configOverrides is nil.

// Copyright 2014 Google Inc. All Rights Reserved.

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[yshngg]

Hi @yuguorui , thanks for your contribution!

Could you provide detailed information on how to reproduce this panic?