[tools] Report infra failure on incorrect usage or uncaptured exceptions

TBR=machenbach@chromium.org

No-Try: true
Bug: chromium:893464
Change-Id: If7d9f839a715468ded293a488e7fa12fc4ef3347
Reviewed-on: https://chromium-review.googlesource.com/c/1270995
Commit-Queue: Sergiy Byelozyorov <sergiyb@chromium.org>
Reviewed-by: Sergiy Byelozyorov <sergiyb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#56485}

tools/run_perf.py

@@ -125,6 +125,7 @@ GENERIC_RESULTS_RE = re.compile(r"^RESULT ([^:]+): ([^=]+)= ([^ ]+) ([^ ]*)$")
 RESULT_STDDEV_RE = re.compile(r"^\{([^\}]+)\}$")
 RESULT_LIST_RE = re.compile(r"^\[([^\]]+)\]$")
 TOOLS_BASE = os.path.abspath(os.path.dirname(__file__))
+INFRA_FAILURE_RETCODE = 87
 
 
 def GeometricMean(values):
@@ -970,20 +971,20 @@ def Main(args):
 
   if len(args) == 0:  # pragma: no cover
     parser.print_help()
-    return 1
+    return INFRA_FAILURE_RETCODE
 
   if options.arch in ["auto", "native"]:  # pragma: no cover
     options.arch = ARCH_GUESS
 
   if not options.arch in SUPPORTED_ARCHS:  # pragma: no cover
     logging.error("Unknown architecture %s", options.arch)
-    return 1
+    return INFRA_FAILURE_RETCODE
 
   if (options.json_test_results_secondary and
       not options.outdir_secondary):  # pragma: no cover
     logging.error("For writing secondary json test results, a secondary outdir "
                   "patch must be specified.")
-    return 1
+    return INFRA_FAILURE_RETCODE
 
   workspace = os.path.abspath(os.path.join(os.path.dirname(__file__), ".."))
 
@@ -998,10 +999,10 @@ def Main(args):
   else:
     if not os.path.isfile(options.binary_override_path):
       logging.error("binary-override-path must be a file name")
-      return 1
+      return INFRA_FAILURE_RETCODE
     if options.outdir_secondary:
       logging.error("specify either binary-override-path or outdir-secondary")
-      return 1
+      return INFRA_FAILURE_RETCODE
     options.shell_dir = os.path.abspath(
         os.path.dirname(options.binary_override_path))
     default_binary_name = os.path.basename(options.binary_override_path)
@@ -1086,7 +1087,14 @@ def Main(args):
   else:  # pragma: no cover
     print results_secondary
 
-  return min(1, len(results.errors))
+  if results.errors:
+    return 1
+
+  return 0
 
 if __name__ == "__main__":  # pragma: no cover
+  try:
     sys.exit(Main(sys.argv[1:]))
+  except:
+    # Report infra failure on any uncaptured exceptions.
+    return INFRA_FAILURE_RETCODE