Get rid of references to .primary_build_tool

This was introduced to support both buck and bazel build tools, and
is no longer necessary since we completely dropped buck in favor of
bazel.

Change-Id: I5fc96bf1fc27f20180737fea954e150070e5302f

.gitignore

@@ -8,7 +8,6 @@
 *~
 .DS_Store
 .gwt_work_dir
-.primary_build_tool
 /.apt_generated
 /.buckd
 /.classpath

gerrit-httpd/src/main/java/com/google/gerrit/httpd/raw/BazelBuild.java

@@ -14,11 +14,8 @@
 
 package com.google.gerrit.httpd.raw;
 
-import static com.google.common.base.MoreObjects.firstNonNull;
-
 import java.io.IOException;
 import java.nio.file.Path;
-import java.util.Properties;
 
 public class BazelBuild extends BuildSystem {
   public BazelBuild(Path sourceRoot) {
@@ -27,13 +24,7 @@ public class BazelBuild extends BuildSystem {
 
   @Override
   protected ProcessBuilder newBuildProcess(Label label) throws IOException {
-    Properties properties = loadBuildProperties(sourceRoot.resolve(".primary_build_tool"));
-    String bazel = firstNonNull(properties.getProperty("bazel"), "bazel");
-    ProcessBuilder proc = new ProcessBuilder(bazel, "build", label.fullName());
-    if (properties.containsKey("PATH")) {
-      proc.environment().put("PATH", properties.getProperty("PATH"));
-    }
-    return proc;
+    return new ProcessBuilder("bazel", "build", label.fullName());
   }
 
   @Override

tools/eclipse/project.py

@@ -56,12 +56,6 @@ args, _ = opts.parse_args()
 def retrieve_ext_location():
   return check_output(['bazel', 'info', 'output_base']).strip()
 
-def gen_primary_build_tool():
-  bazel = check_output(['which', 'bazel']).strip()
-  with open(path.join(ROOT, ".primary_build_tool"), 'w') as fd:
-    fd.write("bazel=%s\n" % bazel)
-    fd.write("PATH=%s\n" % environ["PATH"])
-
 def _query_classpath(target):
   deps = []
   t = cp_targets[target]
@@ -264,7 +258,6 @@ try:
   gen_project(args.project_name)
   gen_classpath(ext_location)
   gen_factorypath(ext_location)
-  gen_primary_build_tool()
 
   # TODO(davido): Remove this when GWT gone
   gwt_working_dir = ".gwt_work_dir"