Use compose-go + improvements (#9)

Use compose-go https://github.com/compose-spec/compose-go  to make Katenary parsing compose file the official way.
Add labels:
- `volume-from` (with `same-pod`) to avoid volume repetition
- `ignore` to ignore a service
- `mapenv` (replaces the `env-to-service`) to map environment to helm variable (as a template string)
- `secret-vars` declares variables as secret values

More:
- Now, environment (as secret vars) are set in values.yaml
- Ingress has got annotations in values.yaml
- Probes (liveness probe) are improved
- fixed code to optimize
- many others fixes about path, bad volume check, refactorisation, tests...

generator/writers/ingress.go

@@ -10,9 +10,20 @@ import (
 	"gopkg.in/yaml.v3"
 )
 
-const classAndVersionCondition = `{{- if and .Values.__name__.ingress.class (semverCompare ">=1.18-0" .Capabilities.KubeVersion.GitVersion) }}` + "\n"
-const versionCondition = `{{- if semverCompare ">=1.18-0" .Capabilities.KubeVersion.GitVersion }}` + "\n"
+const (
+	classAndVersionCondition = `{{- if and .Values.__name__.ingress.class (semverCompare ">=1.18-0" .Capabilities.KubeVersion.GitVersion) }}` + "\n"
+	versionCondition118      = `{{- if semverCompare ">=1.18-0" .Capabilities.KubeVersion.GitVersion }}` + "\n"
+	versionCondition119      = `{{- if semverCompare ">=1.19-0" .Capabilities.KubeVersion.GitVersion }}` + "\n"
+	apiVersion               = `{{- if semverCompare ">=1.19-0" .Capabilities.KubeVersion.GitVersion -}}
+apiVersion: networking.k8s.io/v1
+{{- else if semverCompare ">=1.14-0" .Capabilities.KubeVersion.GitVersion -}}
+apiVersion: networking.k8s.io/v1beta1
+{{- else -}}
+apiVersion: extensions/v1beta1
+{{- end }}`
+)
 
+// BuildIngress generates the ingress yaml file with conditions.
 func BuildIngress(ingress *helm.Ingress, name, templatesDir string) {
 	// Set the backend for 1.18
 	for _, b := range ingress.Spec.Rules {
@@ -32,22 +43,49 @@ func BuildIngress(ingress *helm.Ingress, name, templatesDir string) {
 	enc.Encode(ingress)
 	buffer.WriteString("{{- end -}}")
 
-	fp, _ := os.Create(fname)
+	fp, err := os.Create(fname)
+	if err != nil {
+		panic(err)
+	}
+	defer fp.Close()
+
 	content := string(buffer.Bytes())
 	lines := strings.Split(content, "\n")
 
 	backendHit := false
 	for _, l := range lines {
+		// apiVersion is a pain...
+		if strings.Contains(l, "apiVersion:") {
+			l = apiVersion
+		}
+
+		// add annotations linked to the Values
+		if strings.Contains(l, "annotations:") {
+			n := CountSpaces(l) + IndentSize
+			l += "\n" + strings.Repeat(" ", n) + "{{- range $k, $v := .Values.__name__.ingress.annotations }}\n"
+			l += strings.Repeat(" ", n) + "{{ $k }}: {{ $v }}\n"
+			l += strings.Repeat(" ", n) + "{{- end }}"
+			l = strings.ReplaceAll(l, "__name__", name)
+		}
+
+		// pathTyype is ony for 1.19+
+		if strings.Contains(l, "pathType:") {
+			n := CountSpaces(l)
+			l = strings.Repeat(" ", n) + versionCondition118 +
+				l + "\n" +
+				strings.Repeat(" ", n) + "{{- end }}"
+		}
+
 		if strings.Contains(l, "ingressClassName") {
 			// should be set only if the version of Kubernetes is 1.18-0 or higher
 			cond := strings.ReplaceAll(classAndVersionCondition, "__name__", name)
 			l = `  ` + cond + l + "\n" + `  {{- end }}`
 		}
 
-		// manage the backend format following the Kubernetes 1.18-0 version or higher
+		// manage the backend format following the Kubernetes 1.19-0 version or higher
 		if strings.Contains(l, "service:") {
 			n := CountSpaces(l)
-			l = strings.Repeat(" ", n) + versionCondition + l
+			l = strings.Repeat(" ", n) + versionCondition119 + l
 		}
 		if strings.Contains(l, "serviceName:") || strings.Contains(l, "servicePort:") {
 			n := CountSpaces(l)
@@ -58,9 +96,6 @@ func BuildIngress(ingress *helm.Ingress, name, templatesDir string) {
 			}
 			backendHit = true
 		}
-
 		fp.WriteString(l + "\n")
 	}
-
-	fp.Close()
 }