Ignore selinux security opts when comparing services

The moby engine v20.x.y adds some selinux [security configurations](https://docs.docker.com/engine/reference/run/#security-configuration)
depending on the [container configuration](https://github.com/moby/moby/blob/master/daemon/create.go#L214).
This would cause the supervisor to enter a service restart loop as the
current and target service configurations will never match. The
supervisor now ignores selinux specific security options since those are
not supported by balenaOS.

Closes: #1890
Change-type: patch

src/compose/service.ts

@@ -28,6 +28,8 @@ import { EnvVarObject } from '../types';
 const SERVICE_NETWORK_MODE_REGEX = /service:\s*(.+)/;
 const CONTAINER_NETWORK_MODE_REGEX = /container:\s*(.+)/;
 
+const unsupportedSecurityOpt = (opt: string) => /label=.*/.test(opt);
+
 export type ServiceStatus =
 	| 'Stopping'
 	| 'Stopped'
@@ -383,6 +385,18 @@ export class Service {
 		}
 		delete config.tmpfs;
 
+		if (config.securityOpt != null) {
+			const unsupported = (config.securityOpt || []).filter(
+				unsupportedSecurityOpt,
+			);
+			if (unsupported.length > 0) {
+				log.warn(`Ignoring unsupported security options: ${unsupported}`);
+				config.securityOpt = (config.securityOpt || []).filter(
+					(opt) => !unsupportedSecurityOpt(opt),
+				);
+			}
+		}
+
 		// Normalise the config before passing it to defaults
 		ComposeUtils.normalizeNullValues(config);
 
@@ -577,7 +591,14 @@ export class Service {
 			groupAdd: container.HostConfig.GroupAdd || [],
 			pid: container.HostConfig.PidMode || '',
 			pidsLimit: container.HostConfig.PidsLimit || 0,
-			securityOpt: container.HostConfig.SecurityOpt || [],
+			securityOpt: (container.HostConfig.SecurityOpt || []).filter(
+				// The docker engine v20+ adds selinux security options depending
+				// on the container configuration. Ignore those in the target state
+				// comparison as selinux is not supported by balenaOS so those options
+				// will not have any effect.
+				// https://github.com/moby/moby/blob/master/daemon/create.go#L214
+				(opt: string) => !unsupportedSecurityOpt(opt),
+			),
 			usernsMode: container.HostConfig.UsernsMode || '',
 			ipc: container.HostConfig.IpcMode || '',
 			macAddress: (container.Config as any).MacAddress || '',

test/src/compose/service.spec.ts

@@ -1031,4 +1031,52 @@ describe('compose/service', () => {
 				.be.false;
 		});
 	});
+
+	describe('Security options', () => {
+		it('ignores selinux security options on the target state', async () => {
+			const service = await Service.fromComposeObject(
+				{
+					appId: 123,
+					serviceId: 123,
+					serviceName: 'test',
+					securityOpt: [
+						'label=user:USER',
+						'label=user:ROLE',
+						'seccomp=unconfined',
+					],
+				},
+				{ appName: 'test' } as any,
+			);
+
+			expect(service.config)
+				.to.have.property('securityOpt')
+				.that.deep.equals(['seccomp=unconfined']);
+		});
+
+		it('ignores selinux security options on the current state', async () => {
+			const mockContainer = createContainer({
+				Id: 'deadbeef',
+				Name: 'main_431889_572579',
+				Config: {
+					Labels: {
+						'io.resin.app-id': '1011165',
+						'io.resin.architecture': 'armv7hf',
+						'io.resin.service-id': '43697',
+						'io.resin.service-name': 'main',
+						'io.resin.supervised': 'true',
+					},
+				},
+				HostConfig: {
+					SecurityOpt: ['label=disable', 'seccomp=unconfined'],
+				},
+			});
+			const service = Service.fromDockerContainer(
+				await mockContainer.inspect(),
+			);
+
+			expect(service.config)
+				.to.have.property('securityOpt')
+				.that.deep.equals(['seccomp=unconfined']);
+		});
+	});
 });