fix(compose): support cgroup_parent and cgroup service fields

docs/compose.md

@@ -22,7 +22,6 @@ which was derived from [Docker Compose file version 3 specification](https://doc
 ### Unimplemented YAML fields
 - Fields that correspond to unimplemented `docker run` flags, e.g., `services.<SERVICE>.links` (corresponds to `docker run --link`)
 - Fields that correspond to unimplemented `docker build` flags, e.g., `services.<SERVICE>.build.extra_hosts` (corresponds to `docker build --add-host`)
-- `services.<SERVICE>.cgroup_parent`
 - `services.<SERVICE>.credential_spec`
 - `services.<SERVICE>.deploy.update_config`
 - `services.<SERVICE>.deploy.rollback_config`

pkg/composer/serviceparser/serviceparser.go

@@ -61,6 +61,8 @@ func warnUnknownFields(svc types.ServiceConfig) {
 		"BlkioConfig",
 		"CapAdd",
 		"CapDrop",
+		"Cgroup",
+		"CgroupParent",
 		"CPUS",
 		"CPUSet",
 		"CPUShares",
@@ -562,6 +564,14 @@ func newContainer(project *types.Project, parsed *Service, i int) (*Container, e
 		c.RunArgs = append(c.RunArgs, fmt.Sprintf("--cpu-shares=%d", svc.CPUShares))
 	}
 
+	if svc.Cgroup != "" {
+		c.RunArgs = append(c.RunArgs, fmt.Sprintf("--cgroupns=%s", svc.Cgroup))
+	}
+
+	if svc.CgroupParent != "" {
+		c.RunArgs = append(c.RunArgs, fmt.Sprintf("--cgroup-parent=%s", svc.CgroupParent))
+	}
+
 	for _, v := range svc.Devices {
 		c.RunArgs = append(c.RunArgs, fmt.Sprintf("--device=%s:%s:%s", v.Source, v.Target, v.Permissions))
 	}

pkg/composer/serviceparser/serviceparser_test.go

@@ -378,6 +378,33 @@ services:
 	}
 }
 
+func TestParseCgroup(t *testing.T) {
+	const dockerComposeYAML = `
+services:
+  foo:
+    image: nginx:alpine
+    cgroup: host
+    cgroup_parent: foo.slice
+`
+	comp := testutil.NewComposeDir(t, dockerComposeYAML)
+	defer comp.CleanUp()
+
+	project, err := testutil.LoadProject(comp.YAMLFullPath(), comp.ProjectName(), nil)
+	assert.NilError(t, err)
+
+	fooSvc, err := project.GetService("foo")
+	assert.NilError(t, err)
+
+	foo, err := Parse(project, fooSvc)
+	assert.NilError(t, err)
+
+	t.Logf("foo: %+v", foo)
+	for _, c := range foo.Containers {
+		assert.Assert(t, in(c.RunArgs, "--cgroupns=host"))
+		assert.Assert(t, in(c.RunArgs, "--cgroup-parent=foo.slice"))
+	}
+}
+
 func TestParseRelative(t *testing.T) {
 	t.Parallel()