do not pass --api-versions to "helm diff" (#1061)

README.md

@@ -270,11 +270,11 @@ bases:
 #
 # Advanced Configuration: API Capabilities
 #
-# Some helmfile tasks render releases locally without querying an actual cluster (diff, apply, template),
+# 'helmfile template' renders releases locally without querying an actual cluster,
 # and in this case `.Capabilities.APIVersions` cannot be populated.
 # When a chart queries for a specific CRD, this can lead to unexpected results.
 # 
-# Configure a fixed list of api versions to pass to helm via the --api-versions flag:
+# Configure a fixed list of api versions to pass to 'helm template' via the --api-versions flag:
 apiVersions:
 - example/v1
 

pkg/app/app_test.go

@@ -3409,25 +3409,6 @@ Affected releases are:
 err: "foo" has dependency to inexistent release "bar"
 `,
 		},
-		{
-			name: "pass apiVersions to helm diff",
-			loc:  location(),
-			files: map[string]string{
-				"/path/to/helmfile.yaml": `
-apiVersions:
-- xxx/v1
-releases:
-- name: foo
-  chart: mychart1
-`,
-			},
-			diffs: map[exectest.DiffKey]error{
-				exectest.DiffKey{Name: "foo", Chart: "mychart1", Flags: "--kube-contextdefault--api-versionsxxx/v1--detailed-exitcode"}: helmexec.ExitError{Code: 2},
-			},
-			upgraded: []exectest.Release{
-				{Name: "foo", Flags: []string{"--kube-context", "default"}},
-			},
-		},
 	}
 
 	for i := range testcases {

pkg/state/state.go

@@ -1619,8 +1619,6 @@ func (st *HelmState) flagsForDiff(helm helmexec.Interface, release *ReleaseSpec,
 		return nil, err
 	}
 
-	flags = st.appendApiVersionsFlags(flags)
-
 	common, err := st.namespaceAndValuesFlags(helm, release, workerIndex)
 	if err != nil {
 		return nil, err