normalize implicit dependencies as explicit depends_on

Signed-off-by: Nicolas De Loof <nicolas.deloof@gmail.com>

loader/loader_test.go

@@ -783,7 +783,7 @@ services:
     build:
      context: ./web
     links:
-      - bar
+      - db
     pid: host
   db:
     image: db
@@ -837,7 +837,7 @@ services:
     image: web
     build: .
     links:
-      - bar
+      - db
   db:
     image: db
     build:

loader/normalize.go

@@ -20,6 +20,7 @@ import (
 	"fmt"
 	"os"
 	"path/filepath"
+	"strings"
 
 	"github.com/compose-spec/compose-go/errdefs"
 	"github.com/compose-spec/compose-go/types"
@@ -95,6 +96,37 @@ func normalize(project *types.Project, resolvePaths bool) error {
 			s.Extends["file"] = &p
 		}
 
+		for _, link := range s.Links {
+			parts := strings.Split(link, ":")
+			if len(parts) == 2 {
+				link = parts[0]
+			}
+			s.DependsOn = setIfMissing(s.DependsOn, link, types.ServiceDependency{
+				Condition: types.ServiceConditionStarted,
+				Restart:   true,
+			})
+		}
+
+		for _, namespace := range []string{s.NetworkMode, s.Ipc, s.Pid, s.Uts, s.Cgroup} {
+			if strings.HasPrefix(namespace, types.ServicePrefix) {
+				name := namespace[len(types.ServicePrefix):]
+				s.DependsOn = setIfMissing(s.DependsOn, name, types.ServiceDependency{
+					Condition: types.ServiceConditionStarted,
+					Restart:   true,
+				})
+			}
+		}
+
+		for _, vol := range s.VolumesFrom {
+			if !strings.HasPrefix(s.Pid, types.ContainerPrefix) {
+				spec := strings.Split(vol, ":")
+				s.DependsOn = setIfMissing(s.DependsOn, spec[0], types.ServiceDependency{
+					Condition: types.ServiceConditionStarted,
+					Restart:   false,
+				})
+			}
+		}
+
 		err := relocateLogDriver(&s)
 		if err != nil {
 			return err
@@ -131,9 +163,20 @@ func normalize(project *types.Project, resolvePaths bool) error {
 	return nil
 }
 
+// setIfMissing adds a ServiceDependency for service if not already defined
+func setIfMissing(d types.DependsOnConfig, service string, dep types.ServiceDependency) types.DependsOnConfig {
+	if d == nil {
+		d = types.DependsOnConfig{}
+	}
+	if _, ok := d[service]; !ok {
+		d[service] = dep
+	}
+	return d
+}
+
 func relocateScale(s *types.ServiceConfig) error {
 	scale := uint64(s.Scale)
-	if scale != 1 {
+	if scale > 1 {
 		logrus.Warn("`scale` is deprecated. Use the `deploy.replicas` element")
 		if s.Deploy == nil {
 			s.Deploy = &types.DeployConfig{}

loader/normalize_test.go

@@ -184,3 +184,61 @@ func TestNormalizeVolumes(t *testing.T) {
 	assert.NilError(t, err)
 	assert.DeepEqual(t, expected, project)
 }
+
+func TestNormalizeDependsOn(t *testing.T) {
+	project := types.Project{
+		Name:     "myProject",
+		Networks: types.Networks{},
+		Volumes:  types.Volumes{},
+		Services: []types.ServiceConfig{
+			{
+				Name: "foo",
+				DependsOn: map[string]types.ServiceDependency{
+					"bar": { // explicit depends_on never should be overridden
+						Condition: types.ServiceConditionHealthy,
+						Restart:   false,
+					},
+				},
+				NetworkMode: "service:zot",
+			},
+			{
+				Name:        "bar",
+				VolumesFrom: []string{"zot"},
+			},
+			{
+				Name: "zot",
+			},
+		},
+	}
+
+	expected := `name: myProject
+services:
+  bar:
+    depends_on:
+      zot:
+        condition: service_started
+    networks:
+      default: null
+    volumes_from:
+    - zot
+  foo:
+    depends_on:
+      bar:
+        condition: service_healthy
+      zot:
+        condition: service_started
+        restart: true
+    network_mode: service:zot
+  zot:
+    networks:
+      default: null
+networks:
+  default:
+    name: myProject_default
+`
+	err := normalize(&project, true)
+	assert.NilError(t, err)
+	marshal, err := yaml.Marshal(project)
+	assert.NilError(t, err)
+	assert.DeepEqual(t, expected, string(marshal))
+}

types/types.go

@@ -256,35 +256,11 @@ const (
 
 // GetDependencies retrieve all services this service depends on
 func (s ServiceConfig) GetDependencies() []string {
-	dependencies := make(set)
-	for dependency := range s.DependsOn {
-		dependencies.append(dependency)
-	}
-	for _, link := range s.Links {
-		parts := strings.Split(link, ":")
-		if len(parts) == 2 {
-			dependencies.append(parts[0])
-		} else {
-			dependencies.append(link)
-		}
-	}
-	if strings.HasPrefix(s.NetworkMode, ServicePrefix) {
-		dependencies.append(s.NetworkMode[len(ServicePrefix):])
-	}
-	if strings.HasPrefix(s.Ipc, ServicePrefix) {
-		dependencies.append(s.Ipc[len(ServicePrefix):])
+	var dependencies []string
+	for service := range s.DependsOn {
+		dependencies = append(dependencies, service)
 	}
-	if strings.HasPrefix(s.Pid, ServicePrefix) {
-		dependencies.append(s.Pid[len(ServicePrefix):])
-	}
-	for _, vol := range s.VolumesFrom {
-		if !strings.HasPrefix(s.Pid, ContainerPrefix) {
-			spec := strings.Split(vol, ":")
-			dependencies.append(spec[0])
-		}
-	}
-
-	return dependencies.toSlice()
+	return dependencies
 }
 
 type set map[string]struct{}
@@ -357,12 +333,12 @@ type ThrottleDevice struct {
 // ShellCommand is a string or list of string args.
 //
 // When marshaled to YAML, nil command fields will be omitted if `omitempty`
-// is specified as a struct tag. Explicitly empty commands (i.e. `[]` or `''`)
+// is specified as a struct tag. Explicitly empty commands (i.e. `[]` or `”`)
 // will serialize to an empty array (`[]`).
 //
 // When marshaled to JSON, the `omitempty` struct must NOT be specified.
 // If the command field is nil, it will be serialized as `null`.
-// Explicitly empty commands (i.e. `[]` or `''`) will serialize to an empty
+// Explicitly empty commands (i.e. `[]` or `”`) will serialize to an empty
 // array (`[]`).
 //
 // The distinction between nil and explicitly empty is important to distinguish