Add mapenv label that is more agnostic

- that means that katenary.io/env-to-service is now DEPRECATED
- the yaml style in label is OK, that allows more possibilities and
  adaptation for users

generator/main.go

@@ -15,6 +15,7 @@ import (
 	"sync"
 
 	"github.com/compose-spec/compose-go/types"
+	"gopkg.in/yaml.v3"
 )
 
 const (
@@ -52,6 +53,7 @@ echo "Done"
 // Create a Deployment for a given compose.Service. It returns a list of objects: a Deployment and a possible Service (kubernetes represnetation as maps).
 func CreateReplicaObject(name string, s types.ServiceConfig, linked map[string]types.ServiceConfig) chan interface{} {
 	ret := make(chan interface{}, len(s.Ports)+len(s.Expose)+2)
+	rebuildEnvMap(&s)
 	go parseService(name, s, linked, ret)
 	return ret
 }
@@ -659,3 +661,31 @@ func readEnvFile(envfilename string) map[string]string {
 	}
 	return env
 }
+
+// rebuildEnvMap will get all LABEL_MAP_ENV to rebuild the env map with tpl.
+func rebuildEnvMap(s *types.ServiceConfig) {
+	mapenv, ok := s.Labels[helm.LABEL_MAP_ENV]
+	if !ok {
+		return
+	}
+
+	// the mapenv is a YAML string
+	var envmap map[string]string
+	err := yaml.Unmarshal([]byte(mapenv), &envmap)
+	if err != nil {
+		logger.ActivateColors = true
+		logger.Red(err.Error())
+		logger.ActivateColors = false
+		return
+	}
+
+	// rebuild the env map
+	for k, v := range envmap {
+		_, ok := s.Environment[k]
+		if !ok {
+			continue
+		}
+		s.Environment[k] = &v
+	}
+
+}

helm/container.go

@@ -1,6 +1,7 @@
 package helm
 
 import (
+	"katenary/logger"
 	"strings"
 
 	"github.com/compose-spec/compose-go/types"
@@ -44,6 +45,17 @@ func NewContainer(name, image string, environment types.MappingWithEquals, label
 	if bound, ok := labels[LABEL_ENV_SERVICE]; ok {
 		toServices = strings.Split(bound, ",")
 	}
+	if len(toServices) > 0 {
+		// warn, it's deprecated now
+		logger.ActivateColors = true
+		logger.Yellowf(
+			"[deprecated] in \"%s\" service: label %s is deprecated, please use %s instead\n",
+			name,
+			LABEL_ENV_SERVICE,
+			LABEL_MAP_ENV,
+		)
+		logger.ActivateColors = false
+	}
 
 	idx := 0
 	for n, v := range environment {

helm/labels.go

@@ -7,15 +7,18 @@ import (
 
 const ReleaseNameTpl = "{{ .Release.Name }}"
 const (
+	LABEL_MAP_ENV     = K + "/mapenv"
 	LABEL_ENV_SECRET  = K + "/secret-envfiles"
 	LABEL_PORT        = K + "/ports"
 	LABEL_INGRESS     = K + "/ingress"
-	LABEL_ENV_SERVICE = K + "/env-to-service"
 	LABEL_VOL_CM      = K + "/configmap-volumes"
 	LABEL_HEALTHCHECK = K + "/healthcheck"
 	LABEL_SAMEPOD     = K + "/same-pod"
 	LABEL_EMPTYDIRS   = K + "/empty-dirs"
 	LABEL_IGNORE      = K + "/ignore"
+
+	//deprecated: use LABEL_MAP_ENV instead
+	LABEL_ENV_SERVICE = K + "/env-to-service"
 )
 
 // GetLabelsDocumentation returns the documentation for the labels.
@@ -24,9 +27,10 @@ func GetLabelsDocumentation() string {
 # Labels
 {{.LABEL_IGNORE      | printf "%-33s"}}: ignore the container, it will not yied any object in the helm chart
 {{.LABEL_ENV_SECRET  | printf "%-33s"}}: set the given file names as a secret instead of configmap
+{{.LABEL_MAP_ENV     | printf "%-33s"}}: map environment variable to a template string (yaml style)
 {{.LABEL_PORT        | printf "%-33s"}}: set the ports to expose as a service (coma separated)
 {{.LABEL_INGRESS     | printf "%-33s"}}: set the port to expose in an ingress (coma separated)
-{{.LABEL_ENV_SERVICE | printf "%-33s"}}: specifies that the environment variable points on a service name (coma separated)
+{{.LABEL_ENV_SERVICE | printf "%-33s"}}: DEPRECATED use {{ .LABEL_MAP_ENV }} instead - specifies that the environment variable points on a service name (coma separated) 
 {{.LABEL_VOL_CM      | printf "%-33s"}}: specifies that the volumes points on a configmap (coma separated)
 {{.LABEL_SAMEPOD     | printf "%-33s"}}: specifies that the pod should be deployed in the same pod than the given service name
 {{.LABEL_EMPTYDIRS   | printf "%-33s"}}: specifies that the given volume names should be "emptyDir" instead of persistentVolumeClaim (coma separated)
@@ -47,6 +51,7 @@ func GetLabelsDocumentation() string {
 		"LABEL_SAMEPOD":     LABEL_SAMEPOD,
 		"LABEL_EMPTYDIRS":   LABEL_EMPTYDIRS,
 		"LABEL_IGNORE":      LABEL_IGNORE,
+		"LABEL_MAP_ENV":     LABEL_MAP_ENV,
 	})
 	return buff.String()
 }