First tryouts on a bisect command.

python/mach_bootstrap.py

@@ -24,6 +24,7 @@
     os.path.join('python', 'servo', 'post_build_commands.py'),
     os.path.join('python', 'servo', 'package_commands.py'),
     os.path.join('python', 'servo', 'devenv_commands.py'),
+    os.path.join('python', 'servo', 'bisect_commands.py'),
 ]
 
 CATEGORIES = {
@@ -67,6 +68,11 @@
         'long': 'Potent potables and assorted snacks.',
         'priority': 10,
     },
+    'bisect': {
+        'short': 'Bisect Commands',
+        'long': 'Bisect with the nightly versions',
+        'priority': 5,
+    },
     'disabled': {
         'short': 'Disabled',
         'long': 'The disabled commands are hidden by default. Use -v to display them. These commands are unavailable '

python/servo/bisect_commands.py

@@ -0,0 +1,81 @@
+# Copyright 2013 The Servo Project Developers. See the COPYRIGHT
+# file at the top-level directory of this distribution.
+#
+# Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+# http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+# <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+# option. This file may not be copied, modified, or distributed
+# except according to those terms.
+
+from __future__ import print_function, unicode_literals
+
+import os
+import os.path as path
+import subprocess
+import time
+from shutil import copytree, rmtree, copy2
+
+from mach.decorators import (
+    CommandArgument,
+    CommandProvider,
+    Command,
+)
+
+from servo.command_base import (
+    CommandBase,
+    check_call, check_output, BIN_SUFFIX,
+    is_linux, is_windows, is_macosx, set_osmesa_env,
+    get_browserhtml_path,
+)
+
+
+def read_file(filename, if_exists=False):
+    if if_exists and not path.exists(filename):
+        return None
+    with open(filename) as f:
+        return f.read()
+
+
+@CommandProvider
+class BisectCommands(CommandBase):
+    @Command('bisect',
+             description='Run Servo using downloaded nightlies',
+             category='bisect')
+    @CommandArgument('--release', '-r', action='store_true',
+                     help='Run the release build')
+    @CommandArgument('--dev', '-d', action='store_true',
+                     help='Run the dev build')
+    @CommandArgument('--android', action='store_true', default=None,
+                     help='Run on an Android device through `adb shell`')
+    @CommandArgument('--debug', action='store_true',
+                     help='Enable the debugger. Not specifying a '
+                          '--debugger option will result in the default '
+                          'debugger being used. The following arguments '
+                          'have no effect without this.')
+    @CommandArgument('--debugger', default=None, type=str,
+                     help='Name of debugger to use.')
+    @CommandArgument('--browserhtml', '-b', action='store_true',
+                     help='Launch with Browser.html')
+    @CommandArgument('--headless', '-z', action='store_true',
+                     help='Launch in headless mode')
+    @CommandArgument('--software', '-s', action='store_true',
+                     help='Launch with software rendering')
+    @CommandArgument(
+        'params', nargs='...',
+        help="Command-line arguments to be passed through to Servo")
+    def bisect(self, params, release=False, dev=False, android=None, debug=False, debugger=None, browserhtml=False,
+            headless=False, software=False):
+        # Run the command
+        SCRIPT_PATH = os.path.split(__file__)[0]
+        command_to_run = [os.path.abspath(os.path.join(SCRIPT_PATH, "..", "..", "mach"))]
+        command_to_run.extend(params)
+        print("Wrapping bisect around command {}".format(command_to_run))
+        start = time.time()
+        proc = subprocess.Popen(command_to_run)
+        output = proc.communicate()
+        if proc.returncode:
+            print("Bisection on nightly {} was bad, trying older version".format("FOOBAR"))
+        else:
+            print("Bisection on nightly {} was good, trying newer version".format("FOOBAR11234"))
+        end = time.time()
+        print("Bisect completed in {} seconds.".format(round(end-start,2)))