Disable P2 mirror lists by default because they are unstable

p2-maven-plugin/src/main/java/org/eclipse/tycho/p2maven/transport/RemoteArtifactRepositoryManagerAgentFactory.java

@@ -20,11 +20,12 @@
 import org.eclipse.equinox.p2.core.spi.IAgentServiceFactory;
 import org.eclipse.equinox.p2.repository.artifact.IArtifactRepositoryManager;
 import org.eclipse.tycho.IRepositoryIdManager;
+import org.eclipse.tycho.version.TychoVersion;
 
 @Component(role = IAgentServiceFactory.class, hint = "org.eclipse.equinox.p2.repository.artifact.IArtifactRepositoryManager")
 public class RemoteArtifactRepositoryManagerAgentFactory implements IAgentServiceFactory {
 
-    @Requirement
+	@Requirement
 	Logger logger;
 
 	@Requirement
@@ -33,26 +34,25 @@ public class RemoteArtifactRepositoryManagerAgentFactory implements IAgentServic
 	@Requirement
 	MavenAuthenticator authenticator;
 
-    @Override
-    public Object createService(IProvisioningAgent agent) {
-        IArtifactRepositoryManager plainRepoManager = (IArtifactRepositoryManager) new ArtifactRepositoryComponent()
-                .createService(agent);
-        if (getDisableP2MirrorsConfiguration()) {
-            plainRepoManager = new P2MirrorDisablingArtifactRepositoryManager(plainRepoManager,
-					logger);
-        }
+	@Override
+	public Object createService(IProvisioningAgent agent) {
+		IArtifactRepositoryManager plainRepoManager = (IArtifactRepositoryManager) new ArtifactRepositoryComponent()
+				.createService(agent);
+		if (getDisableP2MirrorsConfiguration()) {
+			plainRepoManager = new P2MirrorDisablingArtifactRepositoryManager(plainRepoManager, logger);
+		}
 		return new RemoteArtifactRepositoryManager(plainRepoManager, repositoryIdManager, authenticator);
-    }
+	}
 
-    private boolean getDisableP2MirrorsConfiguration() {
-        String key = "tycho.disableP2Mirrors";
+	private boolean getDisableP2MirrorsConfiguration() {
+		String key = "tycho.disableP2Mirrors";
 		String value = System.getProperty(key);
-
-        boolean disableP2Mirrors = Boolean.parseBoolean(value);
-		if (disableP2Mirrors && logger.isDebugEnabled()) {
-            String message = key + "=" + value + " -> ignoring mirrors specified in p2 artifact repositories";
-			logger.debug(message);
-        }
-        return disableP2Mirrors;
-    }
+		if (value != null) {
+			logger.info("Using " + key
+					+ " to disable P2 mirrors is deprecated, use the property eclipse.p2.mirrors instead, see https://tycho.eclipseprojects.io/doc/"
+					+ TychoVersion.getTychoVersion() + "/SystemProperties.html for details.");
+			return Boolean.parseBoolean(value);
+		}
+		return false;
+	}
 }

src/site/markdown/SystemProperties.md

@@ -26,3 +26,12 @@ Name | Value | Default | Documentation
 --- | --- | ---
 tycho.comparator.showDiff | true / false | false | If set to true if text-like files show a unified diff of possible differences in files
 tycho.comparator.threshold | bytes | 5242880 (~5MB) | gives the number of bytes for content to be compared semantically, larger files will only be compared byte-by-byte
+
+### P2
+
+These properties control the behaviour of P2 used by Tycho
+
+Name | Value | Default | Documentation
+--- | --- | ---
+eclipse.p2.mirrors | true / false | true | Each p2 site can define a list of artifact repository mirrors, this controls if P2 mirrors should be used. This is independent from configuring mirrors in the maven configuration to be used by Tycho!
+

tycho-testing-harness/src/main/java/org/eclipse/tycho/test/AbstractTychoIntegrationTest.java

@@ -91,7 +91,7 @@ protected Verifier getVerifier(String test, boolean setTargetPlatform, File user
         Verifier verifier = new Verifier(testDir.getAbsolutePath());
         verifier.setForkJvm(isForked());
         if (isDisableMirrors()) {
-            verifier.setSystemProperty("tycho.disableP2Mirrors", "true");
+            verifier.setSystemProperty("eclipse.p2.mirrors", "false");
         }
         String debug = System.getProperty("tycho.mvnDebug");
         if (debug != null) {