[bazelbuild#6664]: Invoke blaze mod correctly

Author: mtoader

base/src/com/google/idea/blaze/base/command/mod/BlazeModRunnerImpl.java

@@ -38,15 +38,32 @@
 
 public class BlazeModRunnerImpl extends BlazeModRunner {
 
+  private static final String DUMP_REPO_MAPPING = "dump_repo_mapping";
+  private static final String ROOT_WORKSPACE = "";
+
+  /**
+   * {@code bazel mod dump_repo_mapping} takes a canonical repository name and will dump a map
+   * from repoName -> canonicalName of all the external repositories available to that repository
+   * The name {@code ""} is special and considered to be <em>the main workspace</em> so in order to dump the main
+   * repository map we would invoke it like {@code bazel mod dump_repo_mapping ""}.
+   * <p />
+   * Additionally the flag {@code --enable_workspace} needs to be off for this to work. The flag is default
+   * off in bazel 8.0.0 but it is on between 7.1.0 and 8.0.0. So we need to also pass this along in
+   * between those versions for the command to work well.
+   */
   @Override
   public ListenableFuture<ExternalWorkspaceData> dumpRepoMapping(
       Project project,
       BuildSystem.BuildInvoker invoker,
       BlazeContext context,
       BuildSystemName buildSystemName,
       List<String> flags) {
+
+    // TODO: when 8.0.0 is released add this only if it's disabled explicitly for the repo
+    flags.add("--noenable_workspace");
+
     return Futures.transform(
-        runBlazeModGetBytes(project, invoker, context, ImmutableList.of( "dump_repo_mapping", "workspace"), flags),
+        runBlazeModGetBytes(project, invoker, context, ImmutableList.of(DUMP_REPO_MAPPING, ROOT_WORKSPACE), flags),
         bytes -> {
           JsonObject json = JsonParser.parseString(new String(bytes, StandardCharsets.UTF_8).trim()).getAsJsonObject();
 

base/src/com/google/idea/blaze/base/model/ExternalWorkspaceDataProvider.java

@@ -57,12 +57,12 @@ public static ExternalWorkspaceDataProvider getInstance(Project project) {
   }
 
   static Boolean isEnabled(BlazeVersionData blazeVersionData) {
-    // disable this until a more reliable opt-in mechanism is chosen.
-    //
-    // bg: some blaze workspaces with blaze > MINIMUM_BLAZE_VERSION
-    // have explicitly disabled this bzlmod support and this causes
-    // `blaze mod` to fail.
-    return blazeVersionData.bazelIsAtLeastVersion(MINIMUM_BLAZE_VERSION) && Registry.is("bazel.read.external.workspace.data");
+    if (!Registry.is("bazel.read.external.workspace.data")) {
+      logger.info("disabled by registry");
+      return false;
+    }
+
+    return blazeVersionData.bazelIsAtLeastVersion(MINIMUM_BLAZE_VERSION);
   }
 
   public ListenableFuture<ExternalWorkspaceData> getExternalWorkspaceData(

base/src/com/google/idea/blaze/base/sync/ProjectStateSyncTask.java

@@ -233,7 +233,7 @@ private ExternalWorkspaceData getExternalWorkspaceData(
       SyncMode syncMode)
       throws SyncCanceledException, SyncFailedException {
 
-    List<String> syncFlags =
+    List<String> blazeModFlags =
         BlazeFlags.blazeFlags(
             project,
             projectViewSet,
@@ -243,7 +243,7 @@ private ExternalWorkspaceData getExternalWorkspaceData(
 
     ListenableFuture<ExternalWorkspaceData> externalWorkspaceDataFuture =
         ExternalWorkspaceDataProvider.getInstance(project)
-            .getExternalWorkspaceData(context, syncFlags, blazeVersionData, blazeInfo);
+            .getExternalWorkspaceData(context, blazeModFlags, blazeVersionData, blazeInfo);
 
     FutureResult<ExternalWorkspaceData> externalWorkspaceDataResult =
         FutureUtil.waitForFuture(context, externalWorkspaceDataFuture)