Add info item for auto detected local resources

Closes bazelbuild#18287.

PiperOrigin-RevId: 529037360
Change-Id: Ic793c4118a25ccdca5e5734dce25c1ea7685568b

src/main/java/com/google/devtools/build/lib/runtime/commands/InfoCommand.java

@@ -47,6 +47,7 @@
 import com.google.devtools.build.lib.runtime.commands.info.JavaHomeInfoItem;
 import com.google.devtools.build.lib.runtime.commands.info.JavaRuntimeInfoItem;
 import com.google.devtools.build.lib.runtime.commands.info.JavaVirtualMachineInfoItem;
+import com.google.devtools.build.lib.runtime.commands.info.LocalResourcesInfoItem;
 import com.google.devtools.build.lib.runtime.commands.info.MakeInfoItem;
 import com.google.devtools.build.lib.runtime.commands.info.MaxHeapSizeInfoItem;
 import com.google.devtools.build.lib.runtime.commands.info.OutputBaseInfoItem;
@@ -293,7 +294,8 @@ private static Map<String, InfoItem> getHardwiredInfoItemMap(
             new BuildLanguageInfoItem(),
             new DefaultPackagePathInfoItem(commandOptions),
             new StarlarkSemanticsInfoItem(commandOptions),
-            new WorkerMetricsInfoItem());
+            new WorkerMetricsInfoItem(),
+            new LocalResourcesInfoItem());
     ImmutableMap.Builder<String, InfoItem> result = new ImmutableMap.Builder<>();
     for (InfoItem item : hardwiredInfoItems) {
       result.put(item.getName(), item);

src/main/java/com/google/devtools/build/lib/runtime/commands/info/BUILD

@@ -16,6 +16,7 @@ java_library(
     srcs = glob(["*.java"]),
     deps = [
         "//src/main/java/com/google/devtools/build/lib:runtime",
+        "//src/main/java/com/google/devtools/build/lib/actions:localhost_capacity",
         "//src/main/java/com/google/devtools/build/lib/analysis:blaze_version_info",
         "//src/main/java/com/google/devtools/build/lib/analysis:config/build_configuration",
         "//src/main/java/com/google/devtools/build/lib/buildeventstream/proto:build_event_stream_java_proto",

src/main/java/com/google/devtools/build/lib/runtime/commands/info/LocalResourcesInfoItem.java

@@ -0,0 +1,40 @@
+// Copyright 2023 The Bazel Authors. All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//    http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package com.google.devtools.build.lib.runtime.commands.info;
+
+import com.google.common.base.Supplier;
+import com.google.devtools.build.lib.actions.LocalHostCapacity;
+import com.google.devtools.build.lib.actions.ResourceSet;
+import com.google.devtools.build.lib.analysis.config.BuildConfigurationValue;
+import com.google.devtools.build.lib.runtime.CommandEnvironment;
+import com.google.devtools.build.lib.runtime.InfoItem;
+
+/** Info item for auto detected local resources . */
+public final class LocalResourcesInfoItem extends InfoItem {
+  public LocalResourcesInfoItem() {
+    super("local_resources", "Auto detected local resources", false);
+  }
+
+  @Override
+  public byte[] get(
+      Supplier<BuildConfigurationValue> configurationSupplier, CommandEnvironment env) {
+    ResourceSet localResources = LocalHostCapacity.getLocalHostCapacity();
+
+    return print(
+        String.format(
+            "RAM=%dMB, CPU=%.1f",
+            (int) localResources.getMemoryMb(), localResources.getCpuUsage()));
+  }
+}