helm-diff doesn't include values from stdin for helm3 version

[ruslanloman]

Hi,

There is an issue in helm-diff for helm3 version, it doesn't include values from stdin. For helm2 it works as expected.

Current behavior:

$ cat values-10.yaml                                                               
lolkek:                                                                            
  helloword: test                                                                  
  new:                                                                             
    ohoho:                                                                         
      values-10: lolodddd10                                                        
                                                                                   
$ cat values-10.yaml | helm3 diff upgrade test_helm . --allow-unreleased --values -
                                                                                   
+ # Source: test_helm/templates/configMap.yaml                                     
+ apiVersion: v1                                                                   
+ kind: ConfigMap                                                                  
+ metadata:                                                                        
+   name: game-demo                                                                
+ data:                                                                            
+   user-interface.properties: |                                                   
+     null         

Expected one with applied fix:

$ cat values-10.yaml | helm3 diff upgrade test_helm . --allow-unreleased --values -
                                                                                   
+ # Source: test_helm/templates/configMap.yaml                                     
+ apiVersion: v1                                                                   
+ kind: ConfigMap                                                                  
+ metadata:                                                                        
+   name: game-demo                                                                
+ data:                                                                            
+   user-interface.properties: |                                                   
+     ohoho:    

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.