Allow the same release name on different tillerNamespaces (#529)

Closes #528

pkg/app/app.go

@@ -202,13 +202,20 @@ func (a *App) VisitDesiredStatesWithReleasesFiltered(fileOrDir string, converge
 			}
 		}
 
-		releaseNameCounts := map[string]int{}
+		type Key struct {
+			TillerNamespace, Name string
+		}
+		releaseNameCounts := map[Key]int{}
 		for _, r := range st.Releases {
-			releaseNameCounts[r.Name]++
+			tillerNamespace := st.HelmDefaults.TillerNamespace
+			if r.TillerNamespace != "" {
+				tillerNamespace = r.TillerNamespace
+			}
+			releaseNameCounts[Key{tillerNamespace, r.Name}]++
 		}
 		for name, c := range releaseNameCounts {
 			if c > 1 {
-				return false, []error{fmt.Errorf("duplicate release \"%s\" found: there were %d releases named \"%s\" matching specified selector", name, c, name)}
+				return false, []error{fmt.Errorf("duplicate release \"%s\" found in \"%s\": there were %d releases named \"%s\" matching specified selector", name.Name, name.TillerNamespace, c, name.Name)}
 			}
 		}
 

pkg/app/app_test.go

@@ -247,6 +247,8 @@ releases:
   chart: stable/prometheus
 `,
 		"/path/to/helmfile.d/b.yaml": `
+helmDefaults:
+  tillerNamespace: zoo
 releases:
 - name: grafana
   chart: stable/grafana
@@ -258,6 +260,16 @@ releases:
   chart: charts/foo
   labels:
     duplicated: yes
+- name: bar
+  chart: charts/foo
+  tillerNamespace:  bar1
+  labels:
+    duplicatedOK: yes
+- name: bar
+  chart: charts/foo
+  tillerNamespace: bar2
+  labels:
+    duplicatedOK: yes
 `,
 	}
 
@@ -272,7 +284,8 @@ releases:
 		{label: "name!=", expectedCount: 0, expectErr: true, errMsg: "failed processing /path/to/helmfile.d/a1.yaml: Malformed label: name!=. Expected label in form k=v or k!=v"},
 		{label: "name", expectedCount: 0, expectErr: true, errMsg: "failed processing /path/to/helmfile.d/a1.yaml: Malformed label: name. Expected label in form k=v or k!=v"},
 		// See https://github.com/roboll/helmfile/issues/193
-		{label: "duplicated=yes", expectedCount: 0, expectErr: true, errMsg: "failed processing /path/to/helmfile.d/b.yaml: duplicate release \"foo\" found: there were 2 releases named \"foo\" matching specified selector"},
+		{label: "duplicated=yes", expectedCount: 0, expectErr: true, errMsg: "failed processing /path/to/helmfile.d/b.yaml: duplicate release \"foo\" found in \"zoo\": there were 2 releases named \"foo\" matching specified selector"},
+		{label: "duplicatedOK=yes", expectedCount: 2, expectErr: false},
 	}
 
 	for _, testcase := range testcases {