Bug 1530134 - Run clang-format without docker as a fallback, r=jcj

Running clang-format with a bad version is better than not running it at all.

Reviewers: jcj

Reviewed By: jcj

Bug #: 1530134

Differential Revision: https://phabricator.services.mozilla.com/D20938

--HG--
extra : rebase_source : 9ce88b3080bb5dfd2b3705da44f972a6a9d96526
extra : amend_source : 855c6537e98728049e0256a2601b8ca32c166320

mach

@@ -39,28 +39,33 @@ def run_tests(test, cycles="standard", env={}, silent=False):
     subprocess.check_call(command, env=os_env, stdout=stdout, stderr=stderr)
 
 class cfAction(argparse.Action):
-    docker_command = ["docker"]
+    docker_command = None
     restorecon = None
 
     def __call__(self, parser, args, values, option_string=None):
-        if not args.noroot:
-            self.setDockerCommand()
+        self.setDockerCommand(args)
 
         if values:
             files = [os.path.relpath(os.path.abspath(x), start=cwd) for x in values]
         else:
             files = self.modifiedFiles()
-        files = [os.path.join('/home/worker/nss', x) for x in files]
 
         # First check if we can run docker.
         try:
             with open(os.devnull, "w") as f:
                 subprocess.check_call(
                     self.docker_command + ["images"], stdout=f)
         except:
-            print("Please install docker and start the docker daemon.")
-            sys.exit(1)
+            self.docker_command = None
+
+        if self.docker_command is None:
+            print("warning: running clang-format directly, which isn't guaranteed to be correct")
+            command = [cwd + "/automation/clang-format/run_clang_format.sh"] + files
+            repr(command)
+            subprocess.call(command)
+            return
 
+        files = [os.path.join('/home/worker/nss', x) for x in files]
         docker_image = 'clang-format-service:latest'
         cf_docker_folder = cwd + "/automation/clang-format"
 
@@ -113,11 +118,17 @@ class cfAction(argparse.Action):
         subprocess.check_call(command)
         return
 
-    def setDockerCommand(self):
+    def setDockerCommand(self, args):
+        from distutils.spawn import find_executable
         if platform.system() == "Linux":
-            from distutils.spawn import find_executable
-            self.restorecon = find_executable('restorecon')
-            self.docker_command = ["sudo"] + self.docker_command
+            self.restorecon = find_executable("restorecon")
+        dcmd = find_executable("docker")
+        if dcmd is not None:
+            self.docker_command = [dcmd]
+            if not args.noroot:
+                self.docker_command = ["sudo"] + self.docker_command
+        else:
+            self.docker_command = None
 
     def modifiedFiles(self):
         files = []