feat: common labels for all releases in a helmfile (#1415)

This adds `comonLabels` option to helmfile by:

- Adding `CommonLabels` to HelmState
- Changing `markExcludedReleases` and `ListReleases` functions to merge common labels into release labels

Resolves #1266

pkg/app/app.go

@@ -416,6 +416,12 @@ func (a *App) ListReleases(c ListConfigProvider) error {
 			//var releases m
 			for _, r := range run.state.Releases {
 				labels := ""
+				if r.Labels == nil {
+					r.Labels = map[string]string{}
+				}
+				for k, v := range run.state.CommonLabels {
+					r.Labels[k] = v
+				}
 				for k, v := range r.Labels {
 					labels = fmt.Sprintf("%s,%s:%s", labels, k, v)
 				}

pkg/app/app_test.go

@@ -4,8 +4,6 @@ import (
 	"bufio"
 	"bytes"
 	"fmt"
-	"github.com/google/go-cmp/cmp"
-	"github.com/roboll/helmfile/pkg/remote"
 	"io"
 	"log"
 	"os"
@@ -17,6 +15,9 @@ import (
 	"sync"
 	"testing"
 
+	"github.com/google/go-cmp/cmp"
+	"github.com/roboll/helmfile/pkg/remote"
+
 	"github.com/roboll/helmfile/pkg/exectest"
 	"gotest.tools/v3/assert"
 
@@ -4051,6 +4052,8 @@ releases:
 func TestList(t *testing.T) {
 	files := map[string]string{
 		"/path/to/helmfile.d/first.yaml": `
+commonLabels:
+  common: label
 releases:
 - name: myrelease1
   chart: mychart1
@@ -4094,11 +4097,11 @@ releases:
 		assert.NilError(t, err)
 	})
 
-	expected := `NAME      	NAMESPACE	ENABLED	LABELS       
-myrelease1	         	false  	id:myrelease1
-myrelease2	         	true   	             
-myrelease3	         	true   	             
-myrelease4	         	true   	id:myrelease1
+	expected := `NAME      	NAMESPACE	ENABLED	LABELS                    
+myrelease1	         	false  	common:label,id:myrelease1
+myrelease2	         	true   	common:label              
+myrelease3	         	true   	                          
+myrelease4	         	true   	id:myrelease1             
 `
 	assert.Equal(t, expected, out)
 }

pkg/state/state.go

@@ -59,6 +59,7 @@ type HelmState struct {
 	DeprecatedReleases []ReleaseSpec     `yaml:"charts,omitempty"`
 	OverrideNamespace  string            `yaml:"namespace,omitempty"`
 	Repositories       []RepositorySpec  `yaml:"repositories,omitempty"`
+	CommonLabels       map[string]string `yaml:"commonLabels,omitempty"`
 	Releases           []ReleaseSpec     `yaml:"releases,omitempty"`
 	Selectors          []string          `yaml:"-"`
 	ApiVersions        []string          `yaml:"apiVersions,omitempty"`
@@ -1634,14 +1635,14 @@ func (st *HelmState) SelectReleasesWithOverrides() ([]Release, error) {
 	if err != nil {
 		return nil, err
 	}
-	rs, err := markExcludedReleases(st.GetReleasesWithOverrides(), st.Selectors, values)
+	rs, err := markExcludedReleases(st.GetReleasesWithOverrides(), st.Selectors, st.CommonLabels, values)
 	if err != nil {
 		return nil, err
 	}
 	return rs, nil
 }
 
-func markExcludedReleases(releases []ReleaseSpec, selectors []string, values map[string]interface{}) ([]Release, error) {
+func markExcludedReleases(releases []ReleaseSpec, selectors []string, commonLabels map[string]string, values map[string]interface{}) ([]Release, error) {
 	var filteredReleases []Release
 	filters := []ReleaseFilter{}
 	for _, label := range selectors {
@@ -1661,6 +1662,10 @@ func markExcludedReleases(releases []ReleaseSpec, selectors []string, values map
 		// Strip off just the last portion for the name stable/newrelic would give newrelic
 		chartSplit := strings.Split(r.Chart, "/")
 		r.Labels["chart"] = chartSplit[len(chartSplit)-1]
+		//Merge CommonLabels into release labels
+		for k, v := range commonLabels {
+			r.Labels[k] = v
+		}
 		var filterMatch bool
 		for _, f := range filters {
 			if r.Labels == nil {

pkg/state/state_exec_tmpl.go

@@ -83,6 +83,12 @@ func (st *HelmState) ExecuteTemplates() (*HelmState, error) {
 	}
 
 	for i, rt := range st.Releases {
+		if rt.Labels == nil {
+			rt.Labels = map[string]string{}
+		}
+		for k, v := range st.CommonLabels {
+			rt.Labels[k] = v
+		}
 		successFlag := false
 		for it, prev := 0, &rt; it < 6; it++ {
 			tmplData := st.createReleaseTemplateData(prev, vals)