buildman: Avoid retrying a build if it definitely failed

After a build fails buildman will reconfigure and try again, if it did not
reconfigure before the build. However it doesn't actually keep track of
whether it did reconfigure on the previous attempt.

Fix that logic to avoid a pointless rebuild. This speeds things up quite a
bit for failing builds. Previously they would always be built twice.

Change-Id: Ib37f21320baa7c60bed98f4042c0b7ed7c0dc85e
Signed-off-by: Simon Glass <sjg@chromium.org>

tools/buildman/builder.py

@@ -423,12 +423,14 @@ class BuilderThread(threading.Thread):
                         force_build or self.builder.force_build,
                         self.builder.force_build_failures)
                 failed = result.return_code or result.stderr
+                did_config = do_config
                 if failed and not do_config:
                     # If our incremental build failed, try building again
                     # with a reconfig.
                     if self.builder.force_config_on_failure:
                         result, request_config = self.RunCommit(commit_upto,
                             brd, work_dir, True, True, False)
+                        did_config = True
                 do_config = request_config
 
                 # If we built that commit, then config is done. But if we got
@@ -445,7 +447,7 @@ class BuilderThread(threading.Thread):
                 # Of course this is substantially slower if there are build
                 # errors/warnings (e.g. 2-3x slower even if only 10% of builds
                 # have problems).
-                if (failed and not result.already_done and not do_config and
+                if (failed and not result.already_done and not did_config and
                         self.builder.force_config_on_failure):
                     # If this build failed, try the next one with a
                     # reconfigure.