Policyreport cli

[NoSkillGirl]

Related issue

closes #1065

What type of PR is this?

/kind feature

Proposed changes

This PR supports policy report when the policies manifest is applied on resources passed as file/folder or available in cluster.

Checklist

• I have read the contributing guidelines.
• I have added tests that prove my fix is effective or that my feature
  works.
• I have added or changed the documentation.

[realshuting]

Adding other comments:

• Here

  kyverno/pkg/kyverno/apply/command.go

  Lines 163 to 171 in 7fbe422

  	if common.PolicyHasVariables(*policy) && variablesString == "" && valuesFile == "" {
  	rc.skip += len(resources)
  	fmt.Printf("\nskipping policy %s as it has variables. pass the values for the variables using set/values_file flag", policy.Name)
  	continue
  	}
  	if common.PolicyHasVariables(*policy) && variablesString == "" && valuesFile == "" {
  	return sanitizedError.NewWithError(fmt.Sprintf("policy %s have variables. pass the values for the variables using set/values_file flag", policy.Name), err)
  	}

  it has 2 same checks but different results?

• Do we still mutate policy before applying it? I'm applying disallow_latest_tag to a deployment, but I don't see the policy report

kyverno apply samples/best_practices/disallow_latest_tag.yaml  --policy-report --cluster -r nginx-2
I1110 18:17:32.585376   25815 client.go:258] dclient/Poll "msg"="starting registered resources sync"  "period"=300000000000
----------------------------------------------------------------------
POLICY REPORT: not generated as no validation failure

[realshuting]

@NoSkillGirl Is this doc update to date?

The first three worked for me while case 4 and 5 gave me the following error:

$ kyverno apply samples/best_practices --cluster --policy-report -n default -r nginx
Error: valid resource(s) not provided
Cause: failed to load resources
Cause: the server could not find the requested resource

$ kyverno apply samples/best_practices --cluster --policy-report -n default
Error: valid resource(s) not provided
Cause: failed to load resources
Cause: the server could not find the requested resource