Stop panic when deduplicating releases (#2067)

* Stop panic when deduplicating releases
* Add testdata for new testcases

pkg/app/app.go

@@ -1200,14 +1200,11 @@ func (a *App) getSelectedReleases(r *Run, includeTransitiveNeeds bool) ([]state.
 		// releases in the helmfile config.
 		// Otherwise we can't compute the DAG of releases correctly.
 		r, deduped := selectedIds[id]
-		if !deduped {
+		if deduped {
-			panic(fmt.Errorf("assertion error: release %q has never been selected. This shouldn't happen", id))
-		}
-
 			deduplicated = append(deduplicated, r)
-
 			dedupedBefore[id] = struct{}{}
 		}
+	}
 
 	if err := checkDuplicates(r.helm, r.state, deduplicated); err != nil {
 		return nil, nil, err

pkg/app/app_apply_test.go

@@ -1220,4 +1220,65 @@ releases:
 			concurrency: 1,
 		})
 	})
+
+	t.Run("select non existant release with --allow-no-matching-release", func(t *testing.T) {
+		check(t, testcase{
+			files: map[string]string{
+				"/path/to/helmfile.yaml": `
+releases:
+- name: foo
+  chart: incubator/raw
+  namespace: default
+  labels:
+    app: test
+
+- name: bar
+  chart: incubator/raw
+  namespace: default
+  labels:
+    app: test
+`,
+			},
+			selectors: []string{"app=foo"},
+			upgraded:  []exectest.Release{},
+			error:     "err: no releases found that matches specified selector(app=foo) and environment(default), in any helmfile",
+			// as we check for log output, set concurrency to 1 to avoid non-deterministic test result
+			concurrency: 1,
+		})
+	})
+
+	t.Run("select single release from helmfile with two duplicates", func(t *testing.T) {
+		check(t, testcase{
+			files: map[string]string{
+				"/path/to/helmfile.yaml": `
+releases:
+- name: foo
+  chart: incubator/raw
+  namespace: default
+  labels:
+    app: test
+
+- name: bar
+  chart: incubator/raw
+  namespace: default
+  labels:
+    app: build
+
+- name: bar
+  chart: incubator/raw
+  namespace: default
+  labels:
+    app: test
+`,
+			},
+			selectors: []string{"name=foo"},
+			upgraded:  []exectest.Release{},
+			diffs: map[exectest.DiffKey]error{
+				exectest.DiffKey{Name: "foo", Chart: "incubator/raw", Flags: "--kube-contextdefault--namespacedefault--detailed-exitcode"}: helmexec.ExitError{Code: 2},
+			},
+			error: "",
+			// as we check for log output, set concurrency to 1 to avoid non-deterministic test result
+			concurrency: 1,
+		})
+	})
 }

pkg/app/testdata/testapply_2/select_non_existant_release_with_--allow-no-matching-release/log

@@ -0,0 +1,43 @@
+processing file "helmfile.yaml" in directory "."
+first-pass rendering starting for "helmfile.yaml.part.0": inherited=&{default map[] map[]}, overrode=<nil>
+first-pass uses: &{default map[] map[]}
+first-pass rendering output of "helmfile.yaml.part.0":
+ 0: 
+ 1: releases:
+ 2: - name: foo
+ 3:   chart: incubator/raw
+ 4:   namespace: default
+ 5:   labels:
+ 6:     app: test
+ 7: 
+ 8: - name: bar
+ 9:   chart: incubator/raw
+10:   namespace: default
+11:   labels:
+12:     app: test
+13: 
+
+first-pass produced: &{default map[] map[]}
+first-pass rendering result of "helmfile.yaml.part.0": {default map[] map[]}
+vals:
+map[]
+defaultVals:[]
+second-pass rendering result of "helmfile.yaml.part.0":
+ 0: 
+ 1: releases:
+ 2: - name: foo
+ 3:   chart: incubator/raw
+ 4:   namespace: default
+ 5:   labels:
+ 6:     app: test
+ 7: 
+ 8: - name: bar
+ 9:   chart: incubator/raw
+10:   namespace: default
+11:   labels:
+12:     app: test
+13: 
+
+merged environment: &{default map[] map[]}
+0 release(s) matching app=foo found in helmfile.yaml
+

pkg/app/testdata/testapply_2/select_single_release_from_helmfile_with_two_duplicates/log

@@ -0,0 +1,69 @@
+processing file "helmfile.yaml" in directory "."
+first-pass rendering starting for "helmfile.yaml.part.0": inherited=&{default map[] map[]}, overrode=<nil>
+first-pass uses: &{default map[] map[]}
+first-pass rendering output of "helmfile.yaml.part.0":
+ 0: 
+ 1: releases:
+ 2: - name: foo
+ 3:   chart: incubator/raw
+ 4:   namespace: default
+ 5:   labels:
+ 6:     app: test
+ 7: 
+ 8: - name: bar
+ 9:   chart: incubator/raw
+10:   namespace: default
+11:   labels:
+12:     app: build
+13: 
+14: - name: bar
+15:   chart: incubator/raw
+16:   namespace: default
+17:   labels:
+18:     app: test
+19: 
+
+first-pass produced: &{default map[] map[]}
+first-pass rendering result of "helmfile.yaml.part.0": {default map[] map[]}
+vals:
+map[]
+defaultVals:[]
+second-pass rendering result of "helmfile.yaml.part.0":
+ 0: 
+ 1: releases:
+ 2: - name: foo
+ 3:   chart: incubator/raw
+ 4:   namespace: default
+ 5:   labels:
+ 6:     app: test
+ 7: 
+ 8: - name: bar
+ 9:   chart: incubator/raw
+10:   namespace: default
+11:   labels:
+12:     app: build
+13: 
+14: - name: bar
+15:   chart: incubator/raw
+16:   namespace: default
+17:   labels:
+18:     app: test
+19: 
+
+merged environment: &{default map[] map[]}
+1 release(s) matching name=foo found in helmfile.yaml
+
+Affected releases are:
+  foo (incubator/raw) UPDATED
+
+processing 1 groups of releases in this order:
+GROUP RELEASES
+1     default/default/foo
+
+processing releases in group 1/1: default/default/foo
+getting deployed release version failed:unexpected list key: {^foo$ --kube-contextdefault--deleting--deployed--failed--pending}
+
+UPDATED RELEASES:
+NAME   CHART           VERSION
+foo    incubator/raw          
+