feat: add devel flag support (#313)

Resolves #161

Changelog:

* add support for devel flag

* allow for explicit disable of the devel default

main.go

@@ -609,6 +609,7 @@ func findAndIterateOverDesiredStates(fileOrDir string, converge func(*state.Helm
 		if noTarget {
 			continue
 		}
+
 		errs := converge(st, helm)
 		if err := clean(st, errs); err != nil {
 			return err

state/state.go

@@ -15,12 +15,13 @@ import (
 
 	"regexp"
 
+	"os/exec"
+	"syscall"
+
 	"github.com/roboll/helmfile/environment"
 	"github.com/roboll/helmfile/valuesfile"
 	"go.uber.org/zap"
 	"gopkg.in/yaml.v2"
-	"os/exec"
-	"syscall"
 )
 
 // HelmState structure for the helmfile
@@ -49,6 +50,8 @@ type HelmSpec struct {
 	TillerNamespace string   `yaml:"tillerNamespace"`
 	Args            []string `yaml:"args"`
 	Verify          bool     `yaml:"verify"`
+	// Devel, when set to true, use development versions, too. Equivalent to version '>0.0.0-0'
+	Devel bool `yaml:"devel"`
 	// Wait, if set to true, will wait until all Pods, PVCs, Services, and minimum number of Pods of a Deployment are in a ready state before marking the release as successful
 	Wait bool `yaml:"wait"`
 	// Timeout is the time in seconds to wait for any individual Kubernetes operation (like Jobs for hooks, and waits on pod/pvc/svc/deployment readiness) (default 300)
@@ -75,6 +78,8 @@ type ReleaseSpec struct {
 	Chart   string `yaml:"chart"`
 	Version string `yaml:"version"`
 	Verify  *bool  `yaml:"verify"`
+	// Devel, when set to true, use development versions, too. Equivalent to version '>0.0.0-0'
+	Devel *bool `yaml:"devel"`
 	// Wait, if set to true, will wait until all Pods, PVCs, Services, and minimum number of Pods of a Deployment are in a ready state before marking the release as successful
 	Wait *bool `yaml:"wait"`
 	// Timeout is the time in seconds to wait for any individual Kubernetes operation (like Jobs for hooks, and waits on pod/pvc/svc/deployment readiness) (default 300)
@@ -798,6 +803,10 @@ func (state *HelmState) flagsForUpgrade(helm helmexec.Interface, release *Releas
 		flags = append(flags, "--version", release.Version)
 	}
 
+	if state.isDevelopment(release) {
+		flags = append(flags, "--devel")
+	}
+
 	if release.Verify != nil && *release.Verify || state.HelmDefaults.Verify {
 		flags = append(flags, "--verify")
 	}
@@ -843,6 +852,11 @@ func (state *HelmState) flagsForDiff(helm helmexec.Interface, release *ReleaseSp
 	if release.Version != "" {
 		flags = append(flags, "--version", release.Version)
 	}
+
+	if state.isDevelopment(release) {
+		flags = append(flags, "--devel")
+	}
+
 	common, err := state.namespaceAndValuesFlags(helm, release)
 	if err != nil {
 		return nil, err
@@ -850,6 +864,15 @@ func (state *HelmState) flagsForDiff(helm helmexec.Interface, release *ReleaseSp
 	return append(flags, common...), nil
 }
 
+func (state *HelmState) isDevelopment(release *ReleaseSpec) bool {
+	result := state.HelmDefaults.Devel
+	if release.Devel != nil {
+		result = *release.Devel
+	}
+
+	return result
+}
+
 func (state *HelmState) flagsForLint(helm helmexec.Interface, release *ReleaseSpec) ([]string, error) {
 	return state.namespaceAndValuesFlags(helm, release)
 }

state/state_test.go

@@ -286,6 +286,42 @@ func TestHelmState_flagsForUpgrade(t *testing.T) {
 				"--namespace", "test-namespace",
 			},
 		},
+		{
+			name: "devel",
+			defaults: HelmSpec{
+				Devel: true,
+			},
+			release: &ReleaseSpec{
+				Chart:     "test/chart",
+				Version:   "0.1",
+				Wait:      &enable,
+				Name:      "test-charts",
+				Namespace: "test-namespace",
+			},
+			want: []string{
+				"--version", "0.1",
+				"--devel",
+				"--wait",
+				"--namespace", "test-namespace",
+			},
+		},
+		{
+			name: "devel-release",
+			defaults: HelmSpec{
+				Devel: true,
+			},
+			release: &ReleaseSpec{
+				Chart:     "test/chart",
+				Version:   "0.1",
+				Devel:     &disable,
+				Name:      "test-charts",
+				Namespace: "test-namespace",
+			},
+			want: []string{
+				"--version", "0.1",
+				"--namespace", "test-namespace",
+			},
+		},
 		{
 			name: "wait-from-default",
 			defaults: HelmSpec{