Fix publish short-form port mappings

Signed-off-by: CodeLoopdroid <214800619+CodeLoopdroid@users.noreply.github.com>

Author: false200

pkg/compose/publish.go

@@ -36,6 +36,7 @@ import (
 	"github.com/opencontainers/image-spec/specs-go"
 	v1 "github.com/opencontainers/image-spec/specs-go/v1"
 	"github.com/sirupsen/logrus"
+	"go.yaml.in/yaml/v4"
 
 	"github.com/docker/compose/v5/internal/oci"
 	"github.com/docker/compose/v5/pkg/api"
@@ -476,7 +477,7 @@ func composeFileAsByteReader(ctx context.Context, filePath string, project *type
 	if err != nil {
 		return nil, fmt.Errorf("failed to open compose file %s: %w", filePath, err)
 	}
-	base, err := loader.LoadWithContext(ctx, types.ConfigDetails{
+	model, err := loader.LoadModelWithContext(ctx, types.ConfigDetails{
 		WorkingDir:  project.WorkingDir,
 		Environment: project.Environment,
 		ConfigFiles: []types.ConfigFile{
@@ -497,7 +498,7 @@ func composeFileAsByteReader(ctx context.Context, filePath string, project *type
 		return nil, err
 	}
 
-	in, err := base.MarshalYAML()
+	in, err := yaml.Marshal(model)
 	if err != nil {
 		return nil, err
 	}

pkg/compose/publish_test.go

@@ -17,6 +17,8 @@
 package compose
 
 import (
+	"os"
+	"path/filepath"
 	"slices"
 	"testing"
 
@@ -100,3 +102,31 @@ services:
 		return !slices.Contains([]string{".Data", ".Digest", ".Size"}, path.String())
 	}, cmp.Ignore()))
 }
+
+func TestComposeFileAsByteReaderWithShortFormPortsAndInterpolation(t *testing.T) {
+	dir := t.TempDir()
+	composePath := filepath.Join(dir, "compose.yaml")
+	err := os.WriteFile(composePath, []byte(`name: publish-test
+services:
+  whoami:
+    image: docker.io/traefik/whoami:v1.11
+    ports:
+      - ${DASHBOARD_PORT:-3000}:3000
+`), 0o600)
+	assert.NilError(t, err)
+
+	project, err := loader.LoadWithContext(t.Context(), types.ConfigDetails{
+		WorkingDir: dir,
+		Environment: types.Mapping{
+			"DASHBOARD_PORT": "",
+		},
+		ConfigFiles: []types.ConfigFile{
+			{Filename: composePath},
+		},
+	})
+	assert.NilError(t, err)
+
+	reader, err := composeFileAsByteReader(t.Context(), composePath, project)
+	assert.NilError(t, err)
+	assert.Assert(t, reader != nil)
+}

pkg/e2e/publish_test.go

@@ -18,6 +18,8 @@ package e2e
 
 import (
 	"fmt"
+	"os"
+	"path/filepath"
 	"strings"
 	"testing"
 
@@ -60,6 +62,23 @@ or remove sensitive data from your Compose configuration
 		assert.Assert(t, strings.Contains(res.Combined(), "test/test published"), res.Combined())
 	})
 
+	t.Run("publish success short-form port mapping", func(t *testing.T) {
+		dir := t.TempDir()
+		composePath := filepath.Join(dir, "compose-short-port.yml")
+		err := os.WriteFile(composePath, []byte(`services:
+  whoami:
+    image: docker.io/traefik/whoami:v1.11
+    ports:
+      - ${DASHBOARD_PORT:-3000}:3000
+`), 0o600)
+		assert.NilError(t, err)
+
+		res := c.RunDockerComposeCmd(t, "-f", composePath,
+			"-p", projectName, "publish", "test/test", "--with-env", "-y", "--dry-run")
+		assert.Assert(t, strings.Contains(res.Combined(), "test/test publishing"), res.Combined())
+		assert.Assert(t, strings.Contains(res.Combined(), "test/test published"), res.Combined())
+	})
+
 	t.Run("publish with extends", func(t *testing.T) {
 		res := c.RunDockerComposeCmd(t, "-f", "./fixtures/publish/compose-with-extends.yml",
 			"-p", projectName, "publish", "test/test", "--dry-run")