feat: delete in reverse order (#339)

Resolves #312

app_test.go

@@ -5,6 +5,7 @@ import (
 	"github.com/roboll/helmfile/helmexec"
 	"github.com/roboll/helmfile/state"
 	"os"
+	"reflect"
 	"testing"
 )
 
@@ -302,3 +303,111 @@ releases:
 		}
 	}
 }
+
+// See https://github.com/roboll/helmfile/issues/312
+func TestFindAndIterateOverDesiredStates_ReverseOrder(t *testing.T) {
+	absPaths := map[string]string{
+		".": "/path/to",
+		"/path/to/helmfile.d": "/path/to/helmfile.d",
+	}
+	dirs := map[string]bool{
+		"helmfile.d": true,
+	}
+	files := map[string]string{
+		"helmfile.yaml": `
+helmfiles:
+- helmfile.d/a*.yaml
+- helmfile.d/b*.yaml
+`,
+		"/path/to/helmfile.d/a1.yaml": `
+releases:
+- name: zipkin
+  chart: stable/zipkin
+`,
+		"/path/to/helmfile.d/a2.yaml": `
+releases:
+- name: prometheus
+  chart: stable/prometheus
+- name: elasticsearch
+  chart: stable/elasticsearch
+`,
+		"/path/to/helmfile.d/b.yaml": `
+releases:
+- name: grafana
+  chart: stable/grafana
+`,
+	}
+	globMatches := map[string][]string{
+		"/path/to/helmfile.d/a*.yaml": []string{"/path/to/helmfile.d/a1.yaml", "/path/to/helmfile.d/a2.yaml"},
+		"/path/to/helmfile.d/b*.yaml": []string{"/path/to/helmfile.d/b.yaml"},
+	}
+	fileExistsAt := func(path string) bool {
+		_, ok := files[path]
+		return ok
+	}
+	directoryExistsAt := func(path string) bool {
+		_, ok := dirs[path]
+		return ok
+	}
+	readFile := func(filename string) ([]byte, error) {
+		str, ok := files[filename]
+		if !ok {
+			return []byte(nil), fmt.Errorf("no file found: %s", filename)
+		}
+		return []byte(str), nil
+	}
+	glob := func(pattern string) ([]string, error) {
+		matches, ok := globMatches[pattern]
+		if !ok {
+			return []string(nil), fmt.Errorf("no file matched: %s", pattern)
+		}
+		return matches, nil
+	}
+	abs := func(path string) (string, error) {
+		a, ok := absPaths[path]
+		if !ok {
+			return "", fmt.Errorf("abs: unexpected path: %s", path)
+		}
+		return a, nil
+	}
+
+	expected := []string{"grafana", "elasticsearch", "prometheus", "zipkin"}
+
+	testcases := []struct {
+		reverse  bool
+		expected []string
+	}{
+		{reverse: false, expected: []string{"zipkin", "prometheus", "elasticsearch", "grafana"}},
+		{reverse: true, expected: []string{"grafana", "elasticsearch", "prometheus", "zipkin"}},
+	}
+	for _, testcase := range testcases {
+		actual := []string{}
+
+		collectReleases := func(st *state.HelmState, helm helmexec.Interface) []error {
+			for _, r := range st.Releases {
+				actual = append(actual, r.Name)
+			}
+			return []error{}
+		}
+
+		app := &app{
+			readFile:          readFile,
+			glob:              glob,
+			abs:               abs,
+			fileExistsAt:      fileExistsAt,
+			directoryExistsAt: directoryExistsAt,
+			kubeContext:       "default",
+			logger:            helmexec.NewLogger(os.Stderr, "debug"),
+			reverse:           testcase.reverse,
+		}
+		err := app.FindAndIterateOverDesiredStates(
+			"helmfile.yaml", collectReleases, "", []string{}, "default",
+		)
+		if err != nil {
+			t.Errorf("unexpected error: %v", err)
+		}
+		if !reflect.DeepEqual(testcase.expected, actual) {
+			t.Errorf("releases did not match: expected=%v actual=%v", expected, actual)
+		}
+	}
+}

main.go

@@ -418,7 +418,7 @@ Do you really want to apply?
 				},
 			},
 			Action: func(c *cli.Context) error {
-				return findAndIterateOverDesiredStatesUsingFlags(c, func(state *state.HelmState, helm helmexec.Interface) []error {
+				return findAndIterateOverDesiredStatesUsingFlagsWithReverse(c, true, func(state *state.HelmState, helm helmexec.Interface) []error {
 					purge := c.Bool("purge")
 
 					args := args.GetArgs(c.String("args"), state)
@@ -542,9 +542,14 @@ type app struct {
 	abs               func(string) (string, error)
 	fileExistsAt      func(string) bool
 	directoryExistsAt func(string) bool
+	reverse           bool
 }
 
 func findAndIterateOverDesiredStatesUsingFlags(c *cli.Context, converge func(*state.HelmState, helmexec.Interface) []error) error {
+	return findAndIterateOverDesiredStatesUsingFlagsWithReverse(c, false, converge)
+}
+
+func findAndIterateOverDesiredStatesUsingFlagsWithReverse(c *cli.Context, reverse bool, converge func(*state.HelmState, helmexec.Interface) []error) error {
 	fileOrDir := c.GlobalString("file")
 	kubeContext := c.GlobalString("kube-context")
 	namespace := c.GlobalString("namespace")
@@ -564,6 +569,7 @@ func findAndIterateOverDesiredStatesUsingFlags(c *cli.Context, converge func(*st
 		directoryExistsAt: directoryExistsAt,
 		kubeContext:       kubeContext,
 		logger:            logger,
+		reverse:           reverse,
 	}
 	if err := app.FindAndIterateOverDesiredStates(fileOrDir, converge, namespace, selectors, env); err != nil {
 		switch e := err.(type) {
@@ -703,25 +709,16 @@ func (a *app) FindAndIterateOverDesiredStates(fileOrDir string, converge func(*s
 
 		if len(st.Helmfiles) > 0 {
 			noMatchInSubHelmfiles := true
-			for _, globPattern := range st.Helmfiles {
-				helmfileRelativePattern := st.JoinBase(globPattern)
-				matches, err := a.glob(helmfileRelativePattern)
-				if err != nil {
-					return fmt.Errorf("failed processing %s: %v", globPattern, err)
-				}
-				sort.Strings(matches)
+			for _, m := range st.Helmfiles {
+				if err := a.FindAndIterateOverDesiredStates(m, converge, namespace, selectors, env); err != nil {
+					switch err.(type) {
+					case *noMatchingHelmfileError:
 
-				for _, m := range matches {
-					if err := a.FindAndIterateOverDesiredStates(m, converge, namespace, selectors, env); err != nil {
-						switch err.(type) {
-						case *noMatchingHelmfileError:
-
-						default:
-							return fmt.Errorf("failed processing %s: %v", globPattern, err)
-						}
-					} else {
-						noMatchInSubHelmfiles = false
+					default:
+						return fmt.Errorf("failed processing %s: %v", m, err)
 					}
+				} else {
+					noMatchInSubHelmfiles = false
 				}
 			}
 			noMatchInHelmfiles = noMatchInHelmfiles && noMatchInSubHelmfiles
@@ -807,6 +804,27 @@ func (a *app) loadDesiredStateFromYaml(yaml []byte, file string, namespace strin
 		return nil, false, err
 	}
 
+	helmfiles := []string{}
+	for _, globPattern := range st.Helmfiles {
+		helmfileRelativePattern := st.JoinBase(globPattern)
+		matches, err := a.glob(helmfileRelativePattern)
+		if err != nil {
+			return nil, false, fmt.Errorf("failed processing %s: %v", globPattern, err)
+		}
+		sort.Strings(matches)
+
+		helmfiles = append(helmfiles, matches...)
+	}
+	st.Helmfiles = helmfiles
+
+	if a.reverse {
+		rev := func(i, j int) bool {
+			return j < i
+		}
+		sort.Slice(st.Releases, rev)
+		sort.Slice(st.Helmfiles, rev)
+	}
+
 	if a.kubeContext != "" {
 		if st.Context != "" {
 			log.Printf("err: Cannot use option --kube-context and set attribute context.")