convert: do not escape $ into $$ when using the --no-interpolate option (#9703)

Signed-off-by: Lucas Berg <root.lucasberg@gmail.com>
Signed-off-by: Ulysses Souza <ulyssessouza@gmail.com>
Co-authored-by: Ulysses Souza <ulyssessouza@gmail.com>

cmd/compose/convert.go

@@ -18,6 +18,7 @@ package compose
 
 import (
 	"bufio"
+	"bytes"
 	"context"
 	"fmt"
 	"io"
@@ -112,7 +113,7 @@ func convertCommand(p *projectOptions, backend api.Service) *cobra.Command {
 }
 
 func runConvert(ctx context.Context, backend api.Service, opts convertOptions, services []string) error {
-	var json []byte
+	var content []byte
 	project, err := opts.toProject(services,
 		cli.WithInterpolation(!opts.noInterpolate),
 		cli.WithResolvedPaths(true),
@@ -136,7 +137,7 @@ func runConvert(ctx context.Context, backend api.Service, opts convertOptions, s
 		}
 	}
 
-	json, err = backend.Convert(ctx, project, api.ConvertOptions{
+	content, err = backend.Convert(ctx, project, api.ConvertOptions{
 		Format: opts.Format,
 		Output: opts.Output,
 	})
@@ -144,19 +145,23 @@ func runConvert(ctx context.Context, backend api.Service, opts convertOptions, s
 		return err
 	}
 
+	if !opts.noInterpolate {
+		content = escapeDollarSign(content)
+	}
+
 	if opts.quiet {
 		return nil
 	}
 
 	var out io.Writer = os.Stdout
-	if opts.Output != "" && len(json) > 0 {
+	if opts.Output != "" && len(content) > 0 {
 		file, err := os.Create(opts.Output)
 		if err != nil {
 			return err
 		}
 		out = bufio.NewWriter(file)
 	}
-	_, err = fmt.Fprint(out, string(json))
+	_, err = fmt.Fprint(out, string(content))
 	return err
 }
 
@@ -237,3 +242,9 @@ func runConfigImages(opts convertOptions, services []string) error {
 	}
 	return nil
 }
+
+func escapeDollarSign(marshal []byte) []byte {
+	dollar := []byte{'$'}
+	escDollar := []byte{'$', '$'}
+	return bytes.ReplaceAll(marshal, dollar, escDollar)
+}

pkg/compose/compose.go

@@ -17,7 +17,6 @@
 package compose
 
 import (
-	"bytes"
 	"context"
 	"encoding/json"
 	"fmt"
@@ -95,28 +94,14 @@ func getContainerNameWithoutProject(c moby.Container) string {
 func (s *composeService) Convert(ctx context.Context, project *types.Project, options api.ConvertOptions) ([]byte, error) {
 	switch options.Format {
 	case "json":
-		marshal, err := json.MarshalIndent(project, "", "  ")
-		if err != nil {
-			return nil, err
-		}
-		return escapeDollarSign(marshal), nil
+		return json.MarshalIndent(project, "", "  ")
 	case "yaml":
-		marshal, err := yaml.Marshal(project)
-		if err != nil {
-			return nil, err
-		}
-		return escapeDollarSign(marshal), nil
+		return yaml.Marshal(project)
 	default:
 		return nil, fmt.Errorf("unsupported format %q", options)
 	}
 }
 
-func escapeDollarSign(marshal []byte) []byte {
-	dollar := []byte{'$'}
-	escDollar := []byte{'$', '$'}
-	return bytes.ReplaceAll(marshal, dollar, escDollar)
-}
-
 // projectFromName builds a types.Project based on actual resources with compose labels set
 func (s *composeService) projectFromName(containers Containers, projectName string, services ...string) (*types.Project, error) {
 	project := &types.Project{

pkg/e2e/compose_test.go

@@ -234,3 +234,25 @@ networks:
     name: compose-e2e-convert_default`, filepath.Join(wd, "fixtures", "simple-build-test", "nginx-build")), ExitCode: 0})
 	})
 }
+
+func TestConvertInterpolate(t *testing.T) {
+	const projectName = "compose-e2e-convert-interpolate"
+	c := NewParallelCLI(t)
+
+	wd, err := os.Getwd()
+	assert.NilError(t, err)
+
+	t.Run("convert", func(t *testing.T) {
+		res := c.RunDockerComposeCmd(t, "-f", "./fixtures/simple-build-test/compose-interpolate.yaml", "-p", projectName, "convert", "--no-interpolate")
+		res.Assert(t, icmd.Expected{Out: fmt.Sprintf(`services:
+  nginx:
+    build:
+      context: %s
+      dockerfile: ${MYVAR}
+    networks:
+      default: null
+networks:
+  default:
+    name: compose-e2e-convert-interpolate_default`, filepath.Join(wd, "fixtures", "simple-build-test", "nginx-build")), ExitCode: 0})
+	})
+}

pkg/e2e/fixtures/simple-build-test/compose-interpolate.yaml

@@ -0,0 +1,5 @@
+services:
+  nginx:
+    build:
+      context: nginx-build
+      dockerfile: ${MYVAR}