compose: add unit tests for config hash and dependency handling

- TestComposeCreateWritesConfigHashLabel: verify config-hash label is written
- TestComposeUpNoRecreateDependencies: ensure dependencies aren't recreated

Signed-off-by: ChengyuZhu6 <[email protected]>

Author: ChengyuZhu6

cmd/nerdctl/compose/compose_create_linux_test.go

@@ -27,6 +27,7 @@ import (
 	"github.com/containerd/nerdctl/mod/tigron/test"
 	"github.com/containerd/nerdctl/mod/tigron/tig"
 
+	"github.com/containerd/nerdctl/v2/pkg/composer/serviceparser"
 	"github.com/containerd/nerdctl/v2/pkg/testutil"
 	"github.com/containerd/nerdctl/v2/pkg/testutil/nerdtest"
 )
@@ -204,3 +205,24 @@ services:
 	base.ComposeCmd("-f", comp.YAMLFullPath(), "images", "svc0").AssertOutContains(imageSvc0)
 	base.ComposeCmd("-f", comp.YAMLFullPath(), "ps", "svc0", "-a").AssertOutContainsAny("Created", "created")
 }
+
+func TestComposeCreateWritesConfigHashLabel(t *testing.T) {
+	var dockerComposeYAML = fmt.Sprintf(`
+services:
+  svc0:
+    image: %s
+`, testutil.CommonImage)
+
+	base := testutil.NewBase(t)
+	comp := testutil.NewComposeDir(t, dockerComposeYAML)
+	defer comp.CleanUp()
+	projectName := comp.ProjectName()
+	t.Logf("projectName=%q", projectName)
+
+	base.ComposeCmd("-f", comp.YAMLFullPath(), "create").AssertOK()
+	defer base.ComposeCmd("-f", comp.YAMLFullPath(), "down", "-v").Run()
+
+	container := serviceparser.DefaultContainerName(projectName, "svc0", "1")
+	base.Cmd("inspect", "--format", "{{json .Config.Labels}}", container).
+		AssertOutContains("com.docker.compose.config-hash")
+}

cmd/nerdctl/compose/compose_up_linux_test.go

@@ -377,6 +377,46 @@ services:
 	base.ComposeCmd("-f", comp.YAMLFullPath(), "down").AssertOK()
 }
 
+func TestComposeUpNoRecreateDependencies(t *testing.T) {
+	base := testutil.NewBase(t)
+
+	var dockerComposeYAML = fmt.Sprintf(`
+services:
+  foo:
+    image: %s
+    command: "sleep infinity"
+  bar:
+    image: %s
+    command: "sleep infinity"
+    depends_on:
+      - foo
+`, testutil.CommonImage, testutil.CommonImage)
+
+	comp := testutil.NewComposeDir(t, dockerComposeYAML)
+	defer comp.CleanUp()
+	projectName := comp.ProjectName()
+	t.Logf("projectName=%q", projectName)
+
+	base.ComposeCmd("-f", comp.YAMLFullPath(), "up", "-d", "foo").AssertOK()
+	defer base.ComposeCmd("-f", comp.YAMLFullPath(), "down", "-v").Run()
+
+	fooName := serviceparser.DefaultContainerName(projectName, "foo", "1")
+	id1Cmd := base.Cmd("inspect", fooName, "--format", "{{.Id}}")
+	id1Res := id1Cmd.Run()
+	out1 := strings.TrimSpace(id1Res.Stdout())
+	assert.Assert(id1Cmd.Base.T, id1Res.ExitCode == 0, id1Res.Stdout()+id1Res.Stderr())
+
+	// Bring up dependent service; ensure foo is not recreated (ID unchanged)
+	base.ComposeCmd("-f", comp.YAMLFullPath(), "up", "-d", "bar").AssertOK()
+
+	id2Cmd := base.Cmd("inspect", fooName, "--format", "{{.Id}}")
+	id2Res := id2Cmd.Run()
+	out2 := strings.TrimSpace(id2Res.Stdout())
+	assert.Assert(id2Cmd.Base.T, id2Res.ExitCode == 0, id2Res.Stdout()+id2Res.Stderr())
+
+	assert.Equal(base.T, out1, out2)
+}
+
 func TestComposeUpWithExternalNetwork(t *testing.T) {
 	testCase := nerdtest.Setup()