feat(depends): Check call to kubernetes API

We were using netcat to port to check if a service is up, but actually
we can do like Docker / Podman compose and check the status. For now,
I'm using the endpoint status, but maybe we can just check if the object
is "up".

cmd/katenary/main.go

@@ -6,13 +6,13 @@ package main
 
 import (
 	"fmt"
-	"log"
 	"os"
 	"strings"
 
 	"katenary.io/internal/generator"
 	"katenary.io/internal/generator/katenaryfile"
 	"katenary.io/internal/generator/labels"
+	"katenary.io/internal/logger"
 	"katenary.io/internal/utils"
 
 	"github.com/compose-spec/compose-go/v2/cli"
@@ -28,7 +28,7 @@ func main() {
 	rootCmd := buildRootCmd()
 
 	if err := rootCmd.Execute(); err != nil {
-		log.Fatal(err)
+		logger.Fatal(err)
 	}
 }
 

doc/docs/usage.md

@@ -97,7 +97,8 @@ Katenary transforms compose services this way:
 - environment variables will be stored inside a `ConfigMap`
 - image, tags, and ingresses configuration are also stored in `values.yaml` file
 - if named volumes are declared, Katenary create `PersistentVolumeClaims` - not enabled in values file
-- `depends_on` needs that the pointed service declared a port. If not, you can use labels to inform Katenary
+- `depends_on` uses Kubernetes API by default to check if the service endpoint is ready. No port required.
+  Use label `katenary.v3/depends-on: legacy` to use the old netcat method (requires port).
 
 For any other specific configuration, like binding local files as `ConfigMap`, bind variables, add values with
 documentation, etc. You'll need to use labels.
@@ -147,10 +148,8 @@ Katenary proposes a lot of labels to configure the helm chart generation, but so
 
 ### Work with Depends On?
 
-Kubernetes does not provide service or pod starting detection from others pods. But Katenary will create `initContainer`
-to make you able to wait for a service to respond. But you'll probably need to adapt a bit the compose file.
-
-See this compose file:
+Katenary creates `initContainer` to wait for dependent services to be ready. By default, it uses the Kubernetes API
+to check if the service endpoint has ready addresses - no port required.
 
 ```yaml
 version: "3"
@@ -167,9 +166,7 @@ services:
       MYSQL_ROOT_PASSWORD: foobar
 ```
 
-In this case, `webapp` needs to know the `database` port because the `depends_on` points on it and Kubernetes has not
-(yet) solution to check the database startup. Katenary wants to create a `initContainer` to hit on the related service.
-So, instead of exposing the port in the compose definition, let's declare this to Katenary with labels:
+If you need the old netcat-based method (requires port), add the `katenary.v3/depends-on: legacy` label to the dependent service:
 
 ```yaml
 version: "3"
@@ -179,14 +176,15 @@ services:
     image: php:8-apache
     depends_on:
       - database
+    labels:
+      katenary.v3/depends-on: legacy
 
   database:
     image: mariadb
     environment:
       MYSQL_ROOT_PASSWORD: foobar
-    labels:
-      katenary.v3/ports: |-
-        - 3306
+    ports:
+      - 3306:3306
 ```
 
 ### Declare ingresses

install.sh

@@ -49,6 +49,7 @@ fi
 
 # Where to download the binary
 TAG=$(curl -sLf https://repo.katenary.io/api/v1/repos/katenary/katenary/releases/latest 2>/dev/null | grep -Po '"tag_name":\s*"[^"]*"' | cut -d ":" -f2 | tr -d '"')
+TAG=${TAG#releases/}
 
 # use the right names for the OS and architecture
 if [ $ARCH = "x86_64" ]; then
@@ -57,6 +58,7 @@ fi
 
 BIN_URL="https://repo.katenary.io/api/packages/Katenary/generic/katenary/$TAG/katenary-$OS-$ARCH"
 
+
 echo
 echo "Downloading $BIN_URL"
 

internal/generator/chart.go

@@ -2,7 +2,6 @@ package generator
 
 import (
 	"fmt"
-	"log"
 	"maps"
 	"os"
 	"path/filepath"
@@ -331,12 +330,12 @@ func (chart *HelmChart) setSharedConf(service types.ServiceConfig, deployments m
 	}
 	fromservices, err := labelstructs.EnvFromFrom(service.Labels[labels.LabelEnvFrom])
 	if err != nil {
-		log.Fatal("error unmarshaling env-from label:", err)
+		logger.Fatal("error unmarshaling env-from label:", err)
 	}
 	// find the configmap in the chart templates
 	for _, fromservice := range fromservices {
 		if _, ok := chart.Templates[fromservice+".configmap.yaml"]; !ok {
-			log.Printf("configmap %s not found in chart templates", fromservice)
+			logger.Warnf("configmap %s not found in chart templates", fromservice)
 			continue
 		}
 		// find the corresponding target deployment
@@ -356,7 +355,7 @@ func (chart *HelmChart) setEnvironmentValuesFrom(service types.ServiceConfig, de
 	}
 	mapping, err := labelstructs.GetValueFrom(service.Labels[labels.LabelValuesFrom])
 	if err != nil {
-		log.Fatal("error unmarshaling values-from label:", err)
+		logger.Fatal("error unmarshaling values-from label:", err)
 	}
 
 	findDeployment := func(name string) *Deployment {
@@ -375,11 +374,11 @@ func (chart *HelmChart) setEnvironmentValuesFrom(service types.ServiceConfig, de
 		dep := findDeployment(depName[0])
 		target := findDeployment(service.Name)
 		if dep == nil || target == nil {
-			log.Fatalf("deployment %s or %s not found", depName[0], service.Name)
+			logger.Fatalf("deployment %s or %s not found", depName[0], service.Name)
 		}
 		container, index := utils.GetContainerByName(target.service.ContainerName, target.Spec.Template.Spec.Containers)
 		if container == nil {
-			log.Fatalf("Container %s not found", target.GetName())
+			logger.Fatalf("Container %s not found", target.GetName())
 		}
 		reourceName := fmt.Sprintf(`{{ include "%s.fullname" . }}-%s`, chart.Name, depName[0])
 		// add environment with from

internal/generator/configMap.go

@@ -2,7 +2,6 @@ package generator
 
 import (
 	"fmt"
-	"log"
 	"os"
 	"path/filepath"
 	"regexp"
@@ -69,7 +68,7 @@ func NewConfigMap(service types.ServiceConfig, appName string, forFile bool) *Co
 	// get the secrets from the labels
 	secrets, err := labelstructs.SecretsFrom(service.Labels[labels.LabelSecrets])
 	if err != nil {
-		log.Fatal(err)
+		logger.Fatal(err)
 	}
 	// drop the secrets from the environment
 	for _, secret := range secrets {
@@ -95,7 +94,7 @@ func NewConfigMap(service types.ServiceConfig, appName string, forFile bool) *Co
 		if l, ok := service.Labels[labels.LabelMapEnv]; ok {
 			envmap, err := labelstructs.MapEnvFrom(l)
 			if err != nil {
-				log.Fatal("Error parsing map-env", err)
+				logger.Fatal("Error parsing map-env", err)
 			}
 			for key, value := range envmap {
 				cm.AddData(key, strings.ReplaceAll(value, "__APP__", appName))
@@ -145,7 +144,7 @@ func NewConfigMapFromDirectory(service types.ServiceConfig, appName, path string
 	path = filepath.Join(service.WorkingDir, path)
 	path = filepath.Clean(path)
 	if err := cm.AppendDir(path); err != nil {
-		log.Fatal("Error adding files to configmap:", err)
+		logger.Fatal("Error adding files to configmap:", err)
 	}
 	return cm
 }

internal/generator/converter.go

@@ -4,7 +4,6 @@ import (
 	"bytes"
 	"errors"
 	"fmt"
-	"log"
 	"os"
 	"os/exec"
 	"path/filepath"
@@ -596,7 +595,7 @@ func callHelmUpdate(config ConvertOptions) {
 func removeNewlinesInsideBrackets(values []byte) []byte {
 	re, err := regexp.Compile(`(?s)\{\{(.*?)\}\}`)
 	if err != nil {
-		log.Fatal(err)
+		logger.Fatal(err)
 	}
 	return re.ReplaceAllFunc(values, func(b []byte) []byte {
 		// get the first match
@@ -635,7 +634,7 @@ func writeContent(path string, content []byte) {
 	defer f.Close()
 	defer func() {
 		if _, err := f.Write(content); err != nil {
-			log.Fatal(err)
+			logger.Fatal(err)
 		}
 	}()
 }

internal/generator/cronJob.go

@@ -1,11 +1,11 @@
 package generator
 
 import (
-	"log"
 	"strings"
 
 	"katenary.io/internal/generator/labels"
 	"katenary.io/internal/generator/labels/labelstructs"
+	"katenary.io/internal/logger"
 	"katenary.io/internal/utils"
 
 	"github.com/compose-spec/compose-go/v2/types"
@@ -33,7 +33,7 @@ func NewCronJob(service types.ServiceConfig, chart *HelmChart, appName string) (
 	}
 	mapping, err := labelstructs.CronJobFrom(labels)
 	if err != nil {
-		log.Fatalf("Error parsing cronjob labels: %s", err)
+		logger.Fatalf("Error parsing cronjob labels: %s", err)
 		return nil, nil
 	}
 

internal/generator/deployment.go

@@ -2,7 +2,6 @@ package generator
 
 import (
 	"fmt"
-	"log"
 	"os"
 	"path/filepath"
 	"regexp"
@@ -166,7 +165,7 @@ func (d *Deployment) AddHealthCheck(service types.ServiceConfig, container *core
 	if v, ok := service.Labels[labels.LabelHealthCheck]; ok {
 		probes, err := labelstructs.ProbeFrom(v)
 		if err != nil {
-			log.Fatal(err)
+			logger.Fatal(err)
 		}
 		container.LivenessProbe = probes.LivenessProbe
 		container.ReadinessProbe = probes.ReadinessProbe
@@ -201,7 +200,7 @@ func (d *Deployment) AddVolumes(service types.ServiceConfig, appName string) {
 	if v, ok := service.Labels[labels.LabelConfigMapFiles]; ok {
 		binds, err := labelstructs.ConfigMapFileFrom(v)
 		if err != nil {
-			log.Fatal(err)
+			logger.Fatal(err)
 		}
 		for _, bind := range binds {
 			tobind[bind] = true
@@ -263,19 +262,30 @@ func (d *Deployment) BindFrom(service types.ServiceConfig, binded *Deployment) {
 
 // DependsOn adds a initContainer to the deployment that will wait for the service to be up.
 func (d *Deployment) DependsOn(to *Deployment, servicename string) error {
-	// Add a initContainer with busybox:latest using netcat to check if the service is up
-	// it will wait until the service responds to all ports
 	logger.Info("Adding dependency from ", d.service.Name, " to ", to.service.Name)
+
+	useLegacy := false
+	if label, ok := d.service.Labels[labels.LabelDependsOn]; ok {
+		useLegacy = strings.ToLower(label) == "legacy"
+	}
+
+	if useLegacy {
+		return d.dependsOnLegacy(to, servicename)
+	}
+
+	return d.dependsOnK8sAPI(to)
+}
+
+func (d *Deployment) dependsOnLegacy(to *Deployment, servicename string) error {
 	for _, container := range to.Spec.Template.Spec.Containers {
 		commands := []string{}
 		if len(container.Ports) == 0 {
-			logger.Warn("No ports found for service ",
+			logger.Fatal("No ports found for service ",
 				servicename,
 				". You should declare a port in the service or use "+
 					labels.LabelPorts+
 					" label.",
 			)
-			os.Exit(1)
 		}
 		for _, port := range container.Ports {
 			command := fmt.Sprintf("until nc -z %s %d; do\n  sleep 1;\ndone", to.Name, port.ContainerPort)
@@ -293,6 +303,39 @@ func (d *Deployment) DependsOn(to *Deployment, servicename string) error {
 	return nil
 }
 
+func (d *Deployment) dependsOnK8sAPI(to *Deployment) error {
+	script := `NAMESPACE=${NAMESPACE:-default}
+SERVICE=%s
+KUBERNETES_SERVICE_HOST=${KUBERNETES_SERVICE_HOST:-kubernetes.default.svc}
+KUBERNETES_SERVICE_PORT=${KUBERNETES_SERVICE_PORT:-443}
+
+until wget -q -O- --header="Authorization: Bearer $(cat /var/run/secrets/kubernetes.io/serviceaccount/token)" \
+  --cacert=/var/run/secrets/kubernetes.io/serviceaccount/ca.crt \
+  "https://${KUBERNETES_SERVICE_HOST}:${KUBERNETES_SERVICE_PORT}/api/v1/namespaces/${NAMESPACE}/endpoints/${SERVICE}" \
+  | grep -q '"ready":.*true'; do
+  sleep 2
+done`
+
+	command := []string{"/bin/sh", "-c", fmt.Sprintf(script, to.Name)}
+	d.Spec.Template.Spec.InitContainers = append(d.Spec.Template.Spec.InitContainers, corev1.Container{
+		Name:    "wait-for-" + to.service.Name,
+		Image:   "busybox:latest",
+		Command: command,
+		Env: []corev1.EnvVar{
+			{
+				Name: "NAMESPACE",
+				ValueFrom: &corev1.EnvVarSource{
+					FieldRef: &corev1.ObjectFieldSelector{
+						FieldPath: "metadata.namespace",
+					},
+				},
+			},
+		},
+	})
+
+	return nil
+}
+
 // Filename returns the filename of the deployment.
 func (d *Deployment) Filename() string {
 	return d.service.Name + ".deployment.yaml"
@@ -311,7 +354,7 @@ func (d *Deployment) SetEnvFrom(service types.ServiceConfig, appName string, sam
 	defer func() {
 		c, index := d.BindMapFilesToContainer(service, secrets, appName)
 		if c == nil || index == -1 {
-			log.Println("Container not found for service ", service.Name)
+			logger.Warn("Container not found for service ", service.Name)
 			return
 		}
 		d.Spec.Template.Spec.Containers[index] = *c
@@ -320,7 +363,7 @@ func (d *Deployment) SetEnvFrom(service types.ServiceConfig, appName string, sam
 	// secrets from label
 	labelSecrets, err := labelstructs.SecretsFrom(service.Labels[labels.LabelSecrets])
 	if err != nil {
-		log.Fatal(err)
+		logger.Fatal(err)
 	}
 
 	// values from label
@@ -335,7 +378,7 @@ func (d *Deployment) SetEnvFrom(service types.ServiceConfig, appName string, sam
 		_, ok := service.Environment[secret]
 		if !ok {
 			drop = append(drop, secret)
-			logger.Warn("Secret " + secret + " not found in service " + service.Name + " - skpped")
+			logger.Warn("Secret " + secret + " not found in service " + service.Name + " - skipped")
 			continue
 		}
 		secrets = append(secrets, secret)
@@ -352,7 +395,7 @@ func (d *Deployment) SetEnvFrom(service types.ServiceConfig, appName string, sam
 		val, ok := service.Environment[value]
 		if !ok {
 			drop = append(drop, value)
-			logger.Warn("Environment variable " + value + " not found in service " + service.Name + " - skpped")
+			logger.Warn("Environment variable " + value + " not found in service " + service.Name + " - skipped")
 			continue
 		}
 		if d.chart.Values[service.Name].(*Value).Environment == nil {
@@ -384,8 +427,8 @@ func (d *Deployment) BindMapFilesToContainer(service types.ServiceConfig, secret
 
 	if envSize > 0 {
 		if service.Name == "db" {
-			log.Println("Service ", service.Name, " has environment variables")
-			log.Println(service.Environment)
+			logger.Info("Service ", service.Name, " has environment variables")
+			logger.Info(service.Environment)
 		}
 		fromSources = append(fromSources, corev1.EnvFromSource{
 			ConfigMapRef: &corev1.ConfigMapEnvSource{
@@ -615,7 +658,7 @@ func (d *Deployment) appendDirectoryToConfigMap(service types.ServiceConfig, app
 	// TODO: make it recursive to add all files in the directory and subdirectories
 	_, err := os.ReadDir(volume.Source)
 	if err != nil {
-		log.Fatal(err)
+		logger.Fatal(err)
 	}
 	cm := NewConfigMapFromDirectory(service, appName, volume.Source)
 	d.configMaps[pathnme] = &ConfigMapMount{
@@ -660,7 +703,7 @@ func (d *Deployment) appendFileToConfigMap(service types.ServiceConfig, appName
 
 	}
 	if err := cm.AppendFile(volume.Source); err != nil {
-		log.Fatal("Error adding file to configmap:", err)
+		logger.Fatal("Error adding file to configmap:", err)
 	}
 }
 
@@ -721,7 +764,7 @@ func (d *Deployment) bindVolumes(volume types.ServiceVolumeConfig, tobind map[st
 		// Add volume to container
 		stat, err := os.Stat(volume.Source)
 		if err != nil {
-			log.Fatal(err)
+			logger.Fatal(err)
 		}
 
 		if stat.IsDir() {

internal/generator/deployment_test.go

@@ -142,6 +142,86 @@ services:
 	if len(dt.Spec.Template.Spec.InitContainers) != 1 {
 		t.Errorf("Expected 1 init container, got %d", len(dt.Spec.Template.Spec.InitContainers))
 	}
+
+	initContainer := dt.Spec.Template.Spec.InitContainers[0]
+	if !strings.Contains(initContainer.Image, "busybox") {
+		t.Errorf("Expected busybox image, got %s", initContainer.Image)
+	}
+
+	fullCommand := strings.Join(initContainer.Command, " ")
+	if !strings.Contains(fullCommand, "wget") {
+		t.Errorf("Expected wget command (K8s API method), got %s", fullCommand)
+	}
+
+	if !strings.Contains(fullCommand, "/api/v1/namespaces/") {
+		t.Errorf("Expected Kubernetes API call to /api/v1/namespaces/, got %s", fullCommand)
+	}
+
+	if !strings.Contains(fullCommand, "/endpoints/") {
+		t.Errorf("Expected Kubernetes API call to /endpoints/, got %s", fullCommand)
+	}
+
+	if len(initContainer.Env) == 0 {
+		t.Errorf("Expected environment variables to be set for namespace")
+	}
+
+	hasNamespace := false
+	for _, env := range initContainer.Env {
+		if env.Name == "NAMESPACE" && env.ValueFrom != nil && env.ValueFrom.FieldRef != nil {
+			if env.ValueFrom.FieldRef.FieldPath == "metadata.namespace" {
+				hasNamespace = true
+				break
+			}
+		}
+	}
+	if !hasNamespace {
+		t.Errorf("Expected NAMESPACE env var with metadata.namespace fieldRef")
+	}
+}
+
+func TestDependsOnLegacy(t *testing.T) {
+	composeFile := `
+services:
+    web:
+        image: nginx:1.29
+        ports:
+        - 80:80
+        depends_on:
+        - database
+        labels:
+            katenary.v3/depends-on: legacy
+
+    database:
+        image: mariadb:10.5
+        ports:
+        - 3306:3306
+`
+	tmpDir := setup(composeFile)
+	defer teardown(tmpDir)
+
+	currentDir, _ := os.Getwd()
+	os.Chdir(tmpDir)
+	defer os.Chdir(currentDir)
+
+	output := internalCompileTest(t, "-s", webTemplateOutput)
+	dt := v1.Deployment{}
+	if err := yaml.Unmarshal([]byte(output), &dt); err != nil {
+		t.Errorf(unmarshalError, err)
+	}
+
+	if len(dt.Spec.Template.Spec.InitContainers) != 1 {
+		t.Errorf("Expected 1 init container, got %d", len(dt.Spec.Template.Spec.InitContainers))
+	}
+
+	initContainer := dt.Spec.Template.Spec.InitContainers[0]
+	if !strings.Contains(initContainer.Image, "busybox") {
+		t.Errorf("Expected busybox image, got %s", initContainer.Image)
+	}
+
+	fullCommand := strings.Join(initContainer.Command, " ")
+	if !strings.Contains(fullCommand, "nc") {
+		t.Errorf("Expected nc (netcat) command for legacy method, got %s", fullCommand)
+	}
 }
 
 func TestHelmDependencies(t *testing.T) {

internal/generator/extrafiles/readme.go

@@ -4,12 +4,12 @@ import (
 	"bytes"
 	_ "embed"
 	"fmt"
-	"log"
 	"sort"
 	"strings"
 	"text/template"
 
 	"gopkg.in/yaml.v3"
+	"katenary.io/internal/logger"
 )
 
 //go:embed readme.tpl
@@ -50,7 +50,7 @@ func ReadMeFile(charname, description string, values map[string]any) string {
 	vv := map[string]any{}
 	out, _ := yaml.Marshal(values)
 	if err := yaml.Unmarshal(out, &vv); err != nil {
-		log.Printf("Error parsing values: %s", err)
+		logger.Warnf("Error parsing values: %s", err)
 	}
 
 	result := make(map[string]string)

internal/generator/generator.go

@@ -3,7 +3,6 @@ package generator
 import (
 	"bytes"
 	"fmt"
-	"log"
 	"regexp"
 	"strings"
 
@@ -145,7 +144,7 @@ func Generate(project *types.Project) (*HelmChart, error) {
 
 	// generate configmaps with environment variables
 	if err := chart.generateConfigMapsAndSecrets(project); err != nil {
-		log.Fatalf("error generating configmaps and secrets: %s", err)
+		logger.Fatalf("error generating configmaps and secrets: %s", err)
 	}
 
 	// if the env-from label is set, we need to add the env vars from the configmap
@@ -280,7 +279,7 @@ func addStaticVolumes(deployments map[string]*Deployment, service types.ServiceC
 	var d *Deployment
 	var ok bool
 	if d, ok = deployments[service.Name]; !ok {
-		log.Printf("service %s not found in deployments", service.Name)
+		logger.Warnf("service %s not found in deployments", service.Name)
 		return
 	}
 
@@ -292,7 +291,7 @@ func addStaticVolumes(deployments map[string]*Deployment, service types.ServiceC
 		var y []byte
 		var err error
 		if y, err = config.configMap.Yaml(); err != nil {
-			log.Fatal(err)
+			logger.Fatal(err)
 		}
 
 		// add the configmap to the chart
@@ -434,7 +433,7 @@ func samePodVolume(service types.ServiceConfig, v types.ServiceVolumeConfig, dep
 	// check if it has the same volume
 	for _, tv := range target.Spec.Template.Spec.Volumes {
 		if tv.Name == v.Source {
-			log.Printf("found same pod volume %s in deployment %s and %s", tv.Name, service.Name, targetDeployment)
+			logger.Warnf("found same pod volume %s in deployment %s and %s", tv.Name, service.Name, targetDeployment)
 			return true
 		}
 	}

internal/generator/ingress.go

@@ -1,11 +1,11 @@
 package generator
 
 import (
-	"log"
 	"strings"
 
 	"katenary.io/internal/generator/labels"
 	"katenary.io/internal/generator/labels/labelstructs"
+	"katenary.io/internal/logger"
 	"katenary.io/internal/utils"
 
 	"github.com/compose-spec/compose-go/v2/types"
@@ -36,7 +36,7 @@ func NewIngress(service types.ServiceConfig, Chart *HelmChart) *Ingress {
 
 	mapping, err := labelstructs.IngressFrom(label)
 	if err != nil {
-		log.Fatalf("Failed to parse ingress label: %s\n", err)
+		logger.Fatalf("Failed to parse ingress label: %s\n", err)
 	}
 	if mapping.Hostname == "" {
 		mapping.Hostname = service.Name + ".tld"

internal/generator/katenaryfile/main.go

@@ -3,7 +3,6 @@ package katenaryfile
 import (
 	"bytes"
 	"encoding/json"
-	"log"
 	"os"
 	"reflect"
 	"strings"
@@ -67,7 +66,7 @@ func OverrideWithConfig(project *types.Project) {
 		return
 	}
 	if err := yaml.NewDecoder(fp).Decode(&services); err != nil {
-		log.Fatal(err)
+		logger.Fatal(err)
 		return
 	}
 	for _, p := range project.Services {
@@ -79,7 +78,7 @@ func OverrideWithConfig(project *types.Project) {
 			}
 			err := getLabelContent(o, &s, labelName)
 			if err != nil {
-				log.Fatal(err)
+				logger.Fatal(err)
 			}
 			project.Services[name] = s
 		}
@@ -113,7 +112,7 @@ func getLabelContent(o any, service *types.ServiceConfig, labelName string) erro
 
 	c, err := yaml.Marshal(o)
 	if err != nil {
-		log.Println(err)
+		logger.Failure(err.Error())
 		return err
 	}
 	val := strings.TrimSpace(string(c))
@@ -121,7 +120,7 @@ func getLabelContent(o any, service *types.ServiceConfig, labelName string) erro
 		// special case, values must be set from some defaults
 		ing, err := labelstructs.IngressFrom(val)
 		if err != nil {
-			log.Fatal(err)
+			logger.Fatal(err)
 			return err
 		}
 		c, err := yaml.Marshal(ing)

internal/generator/labels/katenaryLabels.go

@@ -4,13 +4,13 @@ import (
 	"bytes"
 	_ "embed"
 	"fmt"
-	"log"
 	"regexp"
 	"sort"
 	"strings"
 	"text/tabwriter"
 	"text/template"
 
+	"katenary.io/internal/logger"
 	"katenary.io/internal/utils"
 
 	"sigs.k8s.io/yaml"
@@ -36,6 +36,7 @@ const (
 	LabelEnvFrom        Label = KatenaryLabelPrefix + "/env-from"
 	LabelExchangeVolume Label = KatenaryLabelPrefix + "/exchange-volumes"
 	LabelValuesFrom     Label = KatenaryLabelPrefix + "/values-from"
+	LabelDependsOn      Label = KatenaryLabelPrefix + "/depends-on"
 )
 
 var (
@@ -134,7 +135,7 @@ func GetLabelHelpFor(labelname string, asMarkdown bool) string {
 		KatenaryPrefix: KatenaryLabelPrefix,
 	})
 	if err != nil {
-		log.Fatalf("Error executing template: %v", err)
+		logger.Fatalf("Error executing template: %v", err)
 	}
 	help.Long = buf.String()
 	buf.Reset()
@@ -145,7 +146,7 @@ func GetLabelHelpFor(labelname string, asMarkdown bool) string {
 		KatenaryPrefix: KatenaryLabelPrefix,
 	})
 	if err != nil {
-		log.Fatalf("Error executing template: %v", err)
+		logger.Fatalf("Error executing template: %v", err)
 	}
 	help.Example = buf.String()
 	buf.Reset()
@@ -160,7 +161,7 @@ func GetLabelHelpFor(labelname string, asMarkdown bool) string {
 		KatenaryPrefix: KatenaryLabelPrefix,
 	})
 	if err != nil {
-		log.Fatalf("Error executing template: %v", err)
+		logger.Fatalf("Error executing template: %v", err)
 	}
 
 	return buf.String()

internal/generator/labels/katenaryLabelsDoc.yaml

@@ -355,4 +355,25 @@
           DB_USER: database.MARIADB_USER
           DB_PASSWORD: database.MARIADB_PASSWORD
 
+"depends-on":
+  short: "Method to check if a service is ready (for depends_on)."
+  long: |-
+    When a service uses `depends_on`, Katenary creates an initContainer to wait
+    for the dependent service to be ready.
+
+    By default, Katenary uses the Kubernetes API to check if the service endpoint
+    has ready addresses. This method does not require the service to expose a port.
+
+    Set this label to `legacy` to use the old netcat method that requires a port
+    to be defined for the dependent service.
+  example: |-
+    web:
+      image: nginx
+      depends_on:
+        - database
+      labels:
+        # Use legacy netcat method (requires port)
+        {{ .KatenaryPrefix }}/depends-on: legacy
+  type: "string"
+
 # vim: ft=gotmpl.yaml

internal/generator/labels/labelstructs/probes.go

@@ -2,10 +2,10 @@ package labelstructs
 
 import (
 	"encoding/json"
-	"log"
 
 	"gopkg.in/yaml.v3"
 	corev1 "k8s.io/api/core/v1"
+	"katenary.io/internal/logger"
 )
 
 type HealthCheck struct {
@@ -24,13 +24,13 @@ func ProbeFrom(data string) (*HealthCheck, error) {
 	if livenessProbe, ok := tmp["livenessProbe"]; ok {
 		livenessProbeBytes, err := json.Marshal(livenessProbe)
 		if err != nil {
-			log.Printf("Error marshalling livenessProbe: %v", err)
+			logger.Warnf("Error marshalling livenessProbe: %v", err)
 			return nil, err
 		}
 		livenessProbe := &corev1.Probe{}
 		err = json.Unmarshal(livenessProbeBytes, livenessProbe)
 		if err != nil {
-			log.Printf("Error unmarshalling livenessProbe: %v", err)
+			logger.Warnf("Error unmarshalling livenessProbe: %v", err)
 			return nil, err
 		}
 		mapping.LivenessProbe = livenessProbe
@@ -39,13 +39,13 @@ func ProbeFrom(data string) (*HealthCheck, error) {
 	if readinessProbe, ok := tmp["readinessProbe"]; ok {
 		readinessProbeBytes, err := json.Marshal(readinessProbe)
 		if err != nil {
-			log.Printf("Error marshalling readinessProbe: %v", err)
+			logger.Warnf("Error marshalling readinessProbe: %v", err)
 			return nil, err
 		}
 		readinessProbe := &corev1.Probe{}
 		err = json.Unmarshal(readinessProbeBytes, readinessProbe)
 		if err != nil {
-			log.Printf("Error unmarshalling readinessProbe: %v", err)
+			logger.Warnf("Error unmarshalling readinessProbe: %v", err)
 			return nil, err
 		}
 		mapping.ReadinessProbe = readinessProbe

internal/generator/tools_test.go

@@ -1,11 +1,11 @@
 package generator
 
 import (
-	"log"
 	"os"
 	"os/exec"
 	"testing"
 
+	"katenary.io/internal/logger"
 	"katenary.io/internal/parser"
 )
 
@@ -23,7 +23,7 @@ func setup(content string) string {
 
 func teardown(tmpDir string) {
 	// remove the temporary directory
-	log.Println("Removing temporary directory: ", tmpDir)
+	logger.Info("Removing temporary directory: ", tmpDir)
 	if err := os.RemoveAll(tmpDir); err != nil {
 		panic(err)
 	}
@@ -59,7 +59,7 @@ func compileTest(t *testing.T, force bool, options ...string) string {
 		ChartVersion: chartVersion,
 	}
 	if err := Convert(convertOptions, "compose.yml"); err != nil {
-		log.Printf("Failed to convert: %s", err)
+		logger.Warnf("Failed to convert: %s", err)
 		return err.Error()
 	}
 

internal/logger/logger.go

@@ -1,6 +1,11 @@
 // Package logger provides simple logging functions with icons and colors.
 package logger
 
+import (
+	"fmt"
+	"os"
+)
+
 // Icon is a unicode icon
 type Icon string
 
@@ -22,30 +27,91 @@ const (
 
 const reset = "\033[0m"
 
+// Print prints a message without icon.
+func Print(msg ...any) {
+	fmt.Print(msg...)
+}
+
+// Printf prints a formatted message without icon.
+func Printf(format string, msg ...any) {
+	fmt.Printf(format, msg...)
+}
+
 // Info prints an informational message.
 func Info(msg ...any) {
 	message("", IconInfo, msg...)
 }
 
+// Infof prints a formatted informational message.
+func Infof(format string, msg ...any) {
+	message("", IconInfo, fmt.Sprintf(format, msg...))
+}
+
 // Warn prints a warning message.
 func Warn(msg ...any) {
 	orange := "\033[38;5;214m"
 	message(orange, IconWarning, msg...)
 }
 
+// Warnf prints a formatted warning message.
+func Warnf(format string, msg ...any) {
+	orange := "\033[38;5;214m"
+	message(orange, IconWarning, fmt.Sprintf(format, msg...))
+}
+
 // Success prints a success message.
 func Success(msg ...any) {
 	green := "\033[38;5;34m"
 	message(green, IconSuccess, msg...)
 }
 
+// Successf prints a formatted success message.
+func Successf(format string, msg ...any) {
+	green := "\033[38;5;34m"
+	message(green, IconSuccess, fmt.Sprintf(format, msg...))
+}
+
 // Failure prints a failure message.
 func Failure(msg ...any) {
 	red := "\033[38;5;196m"
 	message(red, IconFailure, msg...)
 }
 
+// Failuref prints a formatted failure message.
+func Failuref(format string, msg ...any) {
+	red := "\033[38;5;196m"
+	message(red, IconFailure, fmt.Sprintf(format, msg...))
+}
+
 // Log prints a message with a custom icon.
 func Log(icon Icon, msg ...any) {
 	message("", icon, msg...)
 }
+
+// Logf prints a formatted message with a custom icon.
+func Logf(icon Icon, format string, msg ...any) {
+	message("", icon, fmt.Sprintf(format, msg...))
+}
+
+func fatal(red string, icon Icon, msg ...any) {
+	fmt.Print(icon, " ", red)
+	fmt.Print(msg...)
+	fmt.Println(reset)
+	os.Exit(1)
+}
+
+func fatalf(red string, icon Icon, format string, msg ...any) {
+	fatal(red, icon, fmt.Sprintf(format, msg...))
+}
+
+// Fatal prints a fatal error message and exits with code 1.
+func Fatal(msg ...any) {
+	red := "\033[38;5;196m"
+	fatal(red, IconFailure, msg...)
+}
+
+// Fatalf prints a fatal error message with formatting and exits with code 1.
+func Fatalf(format string, msg ...any) {
+	red := "\033[38;5;196m"
+	fatalf(red, IconFailure, format, msg...)
+}

internal/logger/logger_test.go

@@ -0,0 +1,79 @@
+package logger
+
+import (
+	"testing"
+)
+
+func TestIcons(t *testing.T) {
+	tests := []struct {
+		name     string
+		got      Icon
+		expected Icon
+	}{
+		{"IconSuccess", IconSuccess, "✅"},
+		{"IconFailure", IconFailure, "❌"},
+		{"IconWarning", IconWarning, "❕"},
+		{"IconNote", IconNote, "📝"},
+		{"IconWorld", IconWorld, "🌐"},
+		{"IconPlug", IconPlug, "🔌"},
+		{"IconPackage", IconPackage, "📦"},
+		{"IconCabinet", IconCabinet, "🗄️"},
+		{"IconInfo", IconInfo, "🔵"},
+		{"IconSecret", IconSecret, "🔒"},
+		{"IconConfig", IconConfig, "🔧"},
+		{"IconDependency", IconDependency, "🔗"},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			if tt.got != tt.expected {
+				t.Errorf("got %q, want %q", tt.got, tt.expected)
+			}
+		})
+	}
+}
+
+func TestInfo(t *testing.T) {
+	defer func() {
+		if r := recover(); r != nil {
+			t.Errorf("Info panicked: %v", r)
+		}
+	}()
+	Info("test message")
+}
+
+func TestWarn(t *testing.T) {
+	defer func() {
+		if r := recover(); r != nil {
+			t.Errorf("Warn panicked: %v", r)
+		}
+	}()
+	Warn("test warning")
+}
+
+func TestSuccess(t *testing.T) {
+	defer func() {
+		if r := recover(); r != nil {
+			t.Errorf("Success panicked: %v", r)
+		}
+	}()
+	Success("test success")
+}
+
+func TestFailure(t *testing.T) {
+	defer func() {
+		if r := recover(); r != nil {
+			t.Errorf("Failure panicked: %v", r)
+		}
+	}()
+	Failure("test failure")
+}
+
+func TestLog(t *testing.T) {
+	defer func() {
+		if r := recover(); r != nil {
+			t.Errorf("Log panicked: %v", r)
+		}
+	}()
+	Log(IconInfo, "test log")
+}

internal/parser/main.go

@@ -3,11 +3,11 @@ package parser
 
 import (
 	"context"
-	"log"
 	"path/filepath"
 
 	"github.com/compose-spec/compose-go/v2/cli"
 	"github.com/compose-spec/compose-go/v2/types"
+	"katenary.io/internal/logger"
 )
 
 func init() {
@@ -37,11 +37,11 @@ func Parse(profiles []string, envFiles []string, dockerComposeFile ...string) (*
 		var err error
 		envFiles[i], err = filepath.Abs(envFiles[i])
 		if err != nil {
-			log.Fatal(err)
+			logger.Fatal(err)
 		}
 	}
 
-	options, err := cli.NewProjectOptions(nil,
+	options, err := cli.NewProjectOptions(dockerComposeFile,
 		cli.WithProfiles(profiles),
 		cli.WithInterpolation(true),
 		cli.WithDefaultConfigPath,

internal/parser/main_test.go

@@ -1,10 +1,11 @@
 package parser
 
 import (
-	"log"
 	"os"
 	"path/filepath"
 	"testing"
+
+	"katenary.io/internal/logger"
 )
 
 const composeFile = `
@@ -27,7 +28,7 @@ func setupTest() (string, error) {
 func tearDownTest(tmpDir string) {
 	if tmpDir != "" {
 		if err := os.RemoveAll(tmpDir); err != nil {
-			log.Fatalf("Failed to remove temporary directory %s: %s", tmpDir, err.Error())
+			logger.Fatalf("Failed to remove temporary directory %s: %s", tmpDir, err.Error())
 		}
 	}
 }

internal/utils/utils.go

@@ -3,7 +3,6 @@ package utils
 import (
 	"bytes"
 	"fmt"
-	"log"
 	"path/filepath"
 	"strings"
 
@@ -133,8 +132,8 @@ func GetValuesFromLabel(service types.ServiceConfig, LabelValues string) map[str
 		labelContent := []any{}
 		err := yaml.Unmarshal([]byte(v), &labelContent)
 		if err != nil {
-			log.Printf("Error parsing label %s: %s", v, err)
-			log.Fatal(err)
+			logger.Warnf("Error parsing label %s: %s", v, err)
+			logger.Fatal(err)
 		}
 
 		for _, value := range labelContent {
@@ -150,7 +149,7 @@ func GetValuesFromLabel(service types.ServiceConfig, LabelValues string) map[str
 					descriptions[k.(string)] = &EnvConfig{Service: service, Description: v.(string)}
 				}
 			default:
-				log.Fatalf("Unknown type in label: %s %T", LabelValues, value)
+				logger.Fatalf("Unknown type in label: %s %T", LabelValues, value)
 			}
 		}
 	}
@@ -171,7 +170,7 @@ func Confirm(question string, icon ...logger.Icon) bool {
 	}
 	var response string
 	if _, err := fmt.Scanln(&response); err != nil {
-		log.Fatalf("Error parsing response: %s", err.Error())
+		logger.Fatalf("Error parsing response: %s", err.Error())
 	}
 	return strings.ToLower(response) == "y"
 }