[SCM] WebKit Debian packaging branch, webkit-1.2, updated. upstream/1.1.90-6072-g9a69373

eric at webkit.org eric at webkit.org
Wed Apr 7 23:51:28 UTC 2010


The following commit has been merged in the webkit-1.2 branch:
commit 7cbf09cb2f9fd64527cf3d44e617184f0a0c66e9
Author: eric at webkit.org <eric at webkit.org@268f45cc-cd09-0410-ab3c-d52691b4dbfc>
Date:   Fri Nov 20 09:01:02 2009 +0000

    2009-11-20  Adam Barth  <abarth at webkit.org>
    
            Reviewed by Eric Seidel.
    
            Create LandingSequence as the all-sing, all-dance landing class
            https://bugs.webkit.org/show_bug.cgi?id=31709
    
            Client can inherit from this class to carefully control exactly which
            steps they wish to have happen in the landing sequence.
    
            * Scripts/bugzilla-tool:
            * Scripts/modules/landingsequence.py: Added.
            * Scripts/modules/webkitlandingscripts.py: Added.
    
    git-svn-id: http://svn.webkit.org/repository/webkit/trunk@51233 268f45cc-cd09-0410-ab3c-d52691b4dbfc

diff --git a/WebKitTools/ChangeLog b/WebKitTools/ChangeLog
index 77f6a72..3985a2b 100644
--- a/WebKitTools/ChangeLog
+++ b/WebKitTools/ChangeLog
@@ -1,3 +1,17 @@
+2009-11-20  Adam Barth  <abarth at webkit.org>
+
+        Reviewed by Eric Seidel.
+
+        Create LandingSequence as the all-sing, all-dance landing class
+        https://bugs.webkit.org/show_bug.cgi?id=31709
+
+        Client can inherit from this class to carefully control exactly which
+        steps they wish to have happen in the landing sequence.
+
+        * Scripts/bugzilla-tool:
+        * Scripts/modules/landingsequence.py: Added.
+        * Scripts/modules/webkitlandingscripts.py: Added.
+
 2009-11-19  Adam Barth  <abarth at webkit.org>
 
         Reviewed by Eric Seidel.
diff --git a/WebKitTools/Scripts/bugzilla-tool b/WebKitTools/Scripts/bugzilla-tool
index 7ac1802..ce6c1f6 100755
--- a/WebKitTools/Scripts/bugzilla-tool
+++ b/WebKitTools/Scripts/bugzilla-tool
@@ -44,16 +44,16 @@ from optparse import make_option
 from modules.bugzilla import Bugzilla, parse_bug_id
 from modules.buildbot import BuildBot
 from modules.changelogs import ChangeLog
-from modules.comments import bug_comment_from_commit_text
+from modules.landingsequence import ConditionalLandingSequence
 from modules.logging import error, log, tee
 from modules.multicommandtool import MultiCommandTool, Command
 from modules.patchcollection import PatchCollection
 from modules.scm import CommitMessage, detect_scm_system, ScriptError, CheckoutNeedsUpdate
 from modules.statusbot import StatusBot
+from modules.webkitlandingscripts import WebKitLandingScripts, commit_message_for_this_commit
 from modules.webkitport import WebKitPort
 from modules.workqueue import WorkQueue, WorkQueueDelegate
 
-
 def plural(noun):
     # This is a dumb plural() implementation which was just enough for our uses.
     if re.search("h$", noun):
@@ -66,24 +66,6 @@ def pluralize(noun, count):
         noun = plural(noun)
     return "%d %s" % (count, noun)
 
-def commit_message_for_this_commit(scm):
-    changelog_paths = scm.modified_changelogs()
-    if not len(changelog_paths):
-        raise ScriptError(message="Found no modified ChangeLogs, cannot create a commit message.\n"
-                          "All changes require a ChangeLog.  See:\n"
-                          "http://webkit.org/coding/contributing.html")
-
-    changelog_messages = []
-    for changelog_path in changelog_paths:
-        log("Parsing ChangeLog: %s" % changelog_path)
-        changelog_entry = ChangeLog(changelog_path).latest_entry()
-        if not changelog_entry:
-            raise ScriptError(message="Failed to parse ChangeLog: " + os.path.abspath(changelog_path))
-        changelog_messages.append(changelog_entry)
-
-    # FIXME: We should sort and label the ChangeLog messages like commit-log-editor does.
-    return CommitMessage("".join(changelog_messages).splitlines())
-
 
 class BugsToCommit(Command):
     def __init__(self):
@@ -197,139 +179,33 @@ class WebKitApplyingScripts:
                 scm.commit_locally_with_message(commit_message.message() or patch["name"])
 
 
-class WebKitLandingScripts:
-    @staticmethod
-    def cleaning_options():
-        return [
-            make_option("--force-clean", action="store_true", dest="force_clean", default=False, help="Clean working directory before applying patches (removes local changes and commits)"),
-            make_option("--no-clean", action="store_false", dest="clean", default=True, help="Don't check if the working directory is clean before applying patches"),
-        ]
-
-    @staticmethod
-    def land_options():
-        return [
-            make_option("--ignore-builders", action="store_false", dest="check_builders", default=True, help="Don't check to see if the build.webkit.org builders are green before landing."),
-            make_option("--no-close", action="store_false", dest="close_bug", default=True, help="Leave bug open after landing."),
-            make_option("--no-build", action="store_false", dest="build", default=True, help="Commit without building first, implies --no-test."),
-            make_option("--no-test", action="store_false", dest="test", default=True, help="Commit without running run-webkit-tests."),
-            make_option("--quiet", action="store_true", dest="quiet", default=False, help="Produce less console output."),
-            make_option("--non-interactive", action="store_true", dest="non_interactive", default=False, help="Never prompt the user, fail as fast as possible."),
-        ] + WebKitPort.port_options()
-
-    @staticmethod
-    def run_command_with_teed_output(args, teed_output):
-        child_process = subprocess.Popen(args, stdout=subprocess.PIPE, stderr=subprocess.STDOUT)
-
-        # Use our own custom wait loop because Popen ignores a tee'd stderr/stdout.
-        # FIXME: This could be improved not to flatten output to stdout.
-        while True:
-            output_line = child_process.stdout.readline()
-            if output_line == "" and child_process.poll() != None:
-                return child_process.poll()
-            teed_output.write(output_line)
-
-    @staticmethod
-    def run_and_throw_if_fail(args, quiet=False):
-        # Cache the child's output locally so it can be used for error reports.
-        child_out_file = StringIO.StringIO()
-        if quiet:
-            dev_null = open(os.devnull, "w")
-        child_stdout = tee(child_out_file, dev_null if quiet else sys.stdout)
-        exit_code = WebKitLandingScripts.run_command_with_teed_output(args, child_stdout)
-        if quiet:
-            dev_null.close()
-
-        child_output = child_out_file.getvalue()
-        child_out_file.close()
-
-        if exit_code:
-            raise ScriptError(script_args=args, exit_code=exit_code, output=child_output)
-
-    @classmethod
-    def run_webkit_script(cls, script_name, quiet=False, port=WebKitPort):
-        log("Running %s" % script_name)
-        cls.run_and_throw_if_fail(port.script_path(script_name), quiet)
-
-    @classmethod
-    def build_webkit(cls, quiet=False, port=WebKitPort):
-        log("Building WebKit")
-        cls.run_and_throw_if_fail(port.build_webkit_command(), quiet)
-
-    @staticmethod
-    def ensure_builders_are_green(buildbot, options):
-        if not options.check_builders or buildbot.core_builders_are_green():
-            return
-        error("Builders at %s are red, please do not commit.  Pass --ignore-builders to bypass this check." % (buildbot.buildbot_host))
-
-    @classmethod
-    def run_webkit_tests(cls, launch_safari, fail_fast=False, quiet=False, port=WebKitPort):
-        args = port.run_webkit_tests_command()
-        if not launch_safari:
-            args.append("--no-launch-safari")
-        if quiet:
-            args.append("--quiet")
-        if fail_fast:
-            args.append("--exit-after-n-failures=1")
-        cls.run_and_throw_if_fail(args)
-
-    @staticmethod
-    def prepare_clean_working_directory(scm, options, allow_local_commits=False):
-        os.chdir(scm.checkout_root)
-        if not allow_local_commits:
-            scm.ensure_no_local_commits(options.force_clean)
-        if options.clean:
-            scm.ensure_clean_working_directory(force_clean=options.force_clean)
-
-    @classmethod
-    def build_and_commit(cls, scm, options):
-        port = WebKitPort.get_port(options)
-        if options.build:
-            cls.build_webkit(quiet=options.quiet, port=port)
-            if options.test:
-                # When running the commit-queue we don't want to launch Safari and we want to exit after the first failure.
-                cls.run_webkit_tests(launch_safari=not options.non_interactive, fail_fast=options.non_interactive, quiet=options.quiet, port=port)
-        commit_message = commit_message_for_this_commit(scm)
-        commit_log = scm.commit_with_message(commit_message.message())
-        return bug_comment_from_commit_text(scm, commit_log)
+class LandDiffLandingSequence(ConditionalLandingSequence):
+    def __init__(self, patch, options, tool):
+        ConditionalLandingSequence.__init__(self, patch, options, tool)
 
-    @classmethod
-    def _close_bug_if_no_active_patches(cls, bugs, bug_id):
-        # Check to make sure there are no r? or r+ patches on the bug before closing.
-        # Assume that r- patches are just previous patches someone forgot to obsolete.
-        patches = bugs.fetch_patches_from_bug(bug_id)
-        for patch in patches:
-            review_flag = patch.get("review")
-            if review_flag == "?" or review_flag == "+":
-                log("Not closing bug %s as attachment %s has review=%s.  Assuming there are more patches to land from this bug." % (patch["bug_id"], patch["id"], review_flag))
-                return
-        bugs.close_bug_as_fixed(bug_id, "All reviewed patches have been landed.  Closing bug.")
+    def update(self):
+        pass
 
-    @classmethod
-    def _land_patch(cls, patch, options, tool):
-        tool.scm().update_webkit() # Update before every patch in case the tree has changed
-        log("Applying patch %s from bug %s." % (patch["id"], patch["bug_id"]))
-        tool.scm().apply_patch(patch, force=options.non_interactive)
+    def apply_patch(self):
+        pass
 
-        # Make sure the tree is still green after updating, before building this patch.
-        # The first patch ends up checking tree status twice, but that's OK.
-        WebKitLandingScripts.ensure_builders_are_green(tool.buildbot, options)
-        comment_text = WebKitLandingScripts.build_and_commit(tool.scm(), options)
-        tool.bugs.clear_attachment_flags(patch["id"], comment_text)
+    def close_patch(self, commit_log):
+        self._comment_test = bug_comment_from_commit_text(self._tool.scm(), commit_log)
+        # There is no patch to close.
 
-    @classmethod
-    def land_patch_and_handle_errors(cls, patch, options, tool):
-        try:
-            cls._land_patch(patch, options, tool)
-            if options.close_bug:
-                cls._close_bug_if_no_active_patches(tool.bugs, patch["bug_id"])
-        except CheckoutNeedsUpdate, e:
-            log("Commit failed because the checkout is out of date.  Please update and try again.")
-            log("You can pass --no-build to skip building/testing after update if you believe the new commits did not affect the results.")
-            WorkQueue.exit_after_handled_error(e)
-        except ScriptError, e:
-            # Mark the patch as commit-queue- and comment in the bug.
-            tool.bugs.reject_patch_from_commit_queue(patch["id"], e.message_with_output())
-            WorkQueue.exit_after_handled_error(e)
+    def close_bug(self):
+        bug_id = self._patch["bug_id"]
+        if bug_id:
+            log("Updating bug %s" % bug_id)
+            if self._options.close_bug:
+                self._tool.bugs.close_bug_as_fixed(bug_id, self._comment_test)
+            else:
+                # FIXME: We should a smart way to figure out if the patch is attached
+                # to the bug, and if so obsolete it.
+                self._tool.bugs.post_comment_to_bug(bug_id, self._comment_test)
+        else:
+            log(self._comment_test)
+            log("No bug id provided.")
 
 
 class LandDiff(Command):
@@ -372,18 +248,13 @@ class LandDiff(Command):
         os.chdir(tool.scm().checkout_root)
         self.update_changelogs_with_reviewer(options.reviewer, bug_id, tool)
 
-        comment_text = WebKitLandingScripts.build_and_commit(tool.scm(), options)
-        if bug_id:
-            log("Updating bug %s" % bug_id)
-            if options.close_bug:
-                tool.bugs.close_bug_as_fixed(bug_id, comment_text)
-            else:
-                # FIXME: We should a smart way to figure out if the patch is attached
-                # to the bug, and if so obsolete it.
-                tool.bugs.post_comment_to_bug(bug_id, comment_text)
-        else:
-            log(comment_text)
-            log("No bug id provided.")
+        fake_patch = {
+            "id": None,
+            "bug_id": bug_id
+        }
+
+        sequence = LandDiffLandingSequence(fake_patch, options, tool)
+        sequence.run()
 
 
 class AbstractPatchProcessingCommand(Command):
@@ -430,8 +301,8 @@ class AbstractPatchLandingCommand(AbstractPatchProcessingCommand):
         WebKitLandingScripts.prepare_clean_working_directory(tool.scm(), options)
 
     def _process_patch(self, patch, options, args, tool):
-        WebKitLandingScripts.land_patch_and_handle_errors(patch, options, tool)
-
+        sequence = ConditionalLandingSequence(patch, options, tool)
+        sequence.run_and_handle_errors()
 
 class LandAttachment(AbstractPatchLandingCommand):
     def __init__(self):
diff --git a/WebKitTools/Scripts/modules/landingsequence.py b/WebKitTools/Scripts/modules/landingsequence.py
new file mode 100644
index 0000000..1ace123
--- /dev/null
+++ b/WebKitTools/Scripts/modules/landingsequence.py
@@ -0,0 +1,118 @@
+#!/usr/bin/env python
+# Copyright (c) 2009, Google Inc. All rights reserved.
+# Copyright (c) 2009 Apple Inc. All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are
+# met:
+# 
+#     * Redistributions of source code must retain the above copyright
+# notice, this list of conditions and the following disclaimer.
+#     * Redistributions in binary form must reproduce the above
+# copyright notice, this list of conditions and the following disclaimer
+# in the documentation and/or other materials provided with the
+# distribution.
+#     * Neither the name of Google Inc. nor the names of its
+# contributors may be used to endorse or promote products derived from
+# this software without specific prior written permission.
+# 
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+from modules.comments import bug_comment_from_commit_text
+from modules.logging import log
+from modules.scm import ScriptError, CheckoutNeedsUpdate
+from modules.webkitlandingscripts import WebKitLandingScripts, commit_message_for_this_commit
+from modules.webkitport import WebKitPort
+from modules.workqueue import WorkQueue
+
+class LandingSequence:
+    def __init__(self, patch, options, tool):
+        self._patch = patch
+        self._options = options
+        self._tool = tool
+        self._port = WebKitPort.get_port(self._options)
+
+    def run(self):
+        self.update()
+        self.apply_patch()
+        self.build()
+        self.test()
+        commit_log = self.commit()
+        self.close_patch(commit_log)
+        self.close_bug()
+
+    def run_and_handle_errors(self):
+        try:
+            self.run()
+        except CheckoutNeedsUpdate, e:
+            log("Commit failed because the checkout is out of date.  Please update and try again.")
+            log("You can pass --no-build to skip building/testing after update if you believe the new commits did not affect the results.")
+            WorkQueue.exit_after_handled_error(e)
+        except ScriptError, e:
+            # Mark the patch as commit-queue- and comment in the bug.
+            self._tool.bugs.reject_patch_from_commit_queue(self._patch["id"], e.message_with_output())
+            WorkQueue.exit_after_handled_error(e)
+
+    def update(self):
+        self._tool.scm().update_webkit()
+
+    def apply_patch(self):
+        log("Processing patch %s from bug %s." % (self._patch["id"], self._patch["bug_id"]))
+        self._tool.scm().apply_patch(self._patch, force=self._options.non_interactive)
+
+    def build(self):
+        # Make sure the tree is still green after updating, before building this patch.
+        # The first patch ends up checking tree status twice, but that's OK.
+        WebKitLandingScripts.ensure_builders_are_green(self._tool.buildbot, self._options)
+        WebKitLandingScripts.build_webkit(quiet=self._options.quiet, port=self._port)
+
+    def test(self):
+        # When running non-interactively we don't want to launch Safari and we want to exit after the first failure.
+        WebKitScripts.run_webkit_tests(launch_safari=not options.non_interactive, fail_fast=options.non_interactive, quiet=options.quiet, port=port)
+
+    def commit(self):
+        commit_message = commit_message_for_this_commit(self._tool.scm())
+        return self._tool.scm().commit_with_message(commit_message.message())
+
+    def close_patch(self, commit_log):
+        comment_text = bug_comment_from_commit_text(self._tool.scm(), commit_log)
+        self._tool.bugs.clear_attachment_flags(self._patch["id"], comment_text)
+
+    def close_bug(self):
+        # Check to make sure there are no r? or r+ patches on the bug before closing.
+        # Assume that r- patches are just previous patches someone forgot to obsolete.
+        patches = self._tool.bugs.fetch_patches_from_bug(self._patch["bug_id"])
+        for patch in patches:
+            review_flag = patch.get("review")
+            if review_flag == "?" or review_flag == "+":
+                log("Not closing bug %s as attachment %s has review=%s.  Assuming there are more patches to land from this bug." % (patch["bug_id"], patch["id"], review_flag))
+                return
+        self._tool.bugs.close_bug_as_fixed(self._patch["bug_id"], "All reviewed patches have been landed.  Closing bug.")
+
+
+class ConditionalLandingSequence(LandingSequence):
+    def __init__(self, patch, options, tool):
+        LandingSequence.__init__(self, patch, options, tool)
+
+    def build(self):
+        if self._options.build:
+            LandingSequence.build(self)
+
+    def test(self):
+        if self._options.build and self._options.test:
+            LandingSequence.test(self)
+
+    def close_bug(self):
+        if self._options.close_bug:
+            LandingSequence.close_bug(self)
+
diff --git a/WebKitTools/Scripts/modules/webkitlandingscripts.py b/WebKitTools/Scripts/modules/webkitlandingscripts.py
new file mode 100644
index 0000000..bfca90a
--- /dev/null
+++ b/WebKitTools/Scripts/modules/webkitlandingscripts.py
@@ -0,0 +1,143 @@
+#!/usr/bin/env python
+# Copyright (c) 2009, Google Inc. All rights reserved.
+# Copyright (c) 2009 Apple Inc. All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are
+# met:
+# 
+#     * Redistributions of source code must retain the above copyright
+# notice, this list of conditions and the following disclaimer.
+#     * Redistributions in binary form must reproduce the above
+# copyright notice, this list of conditions and the following disclaimer
+# in the documentation and/or other materials provided with the
+# distribution.
+#     * Neither the name of Google Inc. nor the names of its
+# contributors may be used to endorse or promote products derived from
+# this software without specific prior written permission.
+# 
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+import os
+import StringIO
+import subprocess
+import sys
+
+from optparse import make_option
+
+from modules.changelogs import ChangeLog
+from modules.logging import log, tee
+from modules.scm import CommitMessage, detect_scm_system, ScriptError, CheckoutNeedsUpdate
+from modules.webkitport import WebKitPort
+
+def commit_message_for_this_commit(scm):
+    changelog_paths = scm.modified_changelogs()
+    if not len(changelog_paths):
+        raise ScriptError(message="Found no modified ChangeLogs, cannot create a commit message.\n"
+                          "All changes require a ChangeLog.  See:\n"
+                          "http://webkit.org/coding/contributing.html")
+
+    changelog_messages = []
+    for changelog_path in changelog_paths:
+        log("Parsing ChangeLog: %s" % changelog_path)
+        changelog_entry = ChangeLog(changelog_path).latest_entry()
+        if not changelog_entry:
+            raise ScriptError(message="Failed to parse ChangeLog: " + os.path.abspath(changelog_path))
+        changelog_messages.append(changelog_entry)
+
+    # FIXME: We should sort and label the ChangeLog messages like commit-log-editor does.
+    return CommitMessage("".join(changelog_messages).splitlines())
+
+
+class WebKitLandingScripts:
+    @staticmethod
+    def cleaning_options():
+        return [
+            make_option("--force-clean", action="store_true", dest="force_clean", default=False, help="Clean working directory before applying patches (removes local changes and commits)"),
+            make_option("--no-clean", action="store_false", dest="clean", default=True, help="Don't check if the working directory is clean before applying patches"),
+        ]
+
+    @staticmethod
+    def land_options():
+        return [
+            make_option("--ignore-builders", action="store_false", dest="check_builders", default=True, help="Don't check to see if the build.webkit.org builders are green before landing."),
+            make_option("--no-close", action="store_false", dest="close_bug", default=True, help="Leave bug open after landing."),
+            make_option("--no-build", action="store_false", dest="build", default=True, help="Commit without building first, implies --no-test."),
+            make_option("--no-test", action="store_false", dest="test", default=True, help="Commit without running run-webkit-tests."),
+            make_option("--quiet", action="store_true", dest="quiet", default=False, help="Produce less console output."),
+            make_option("--non-interactive", action="store_true", dest="non_interactive", default=False, help="Never prompt the user, fail as fast as possible."),
+        ] + WebKitPort.port_options()
+
+    @staticmethod
+    def run_command_with_teed_output(args, teed_output):
+        child_process = subprocess.Popen(args, stdout=subprocess.PIPE, stderr=subprocess.STDOUT)
+
+        # Use our own custom wait loop because Popen ignores a tee'd stderr/stdout.
+        # FIXME: This could be improved not to flatten output to stdout.
+        while True:
+            output_line = child_process.stdout.readline()
+            if output_line == "" and child_process.poll() != None:
+                return child_process.poll()
+            teed_output.write(output_line)
+
+    @staticmethod
+    def run_and_throw_if_fail(args, quiet=False):
+        # Cache the child's output locally so it can be used for error reports.
+        child_out_file = StringIO.StringIO()
+        if quiet:
+            dev_null = open(os.devnull, "w")
+        child_stdout = tee(child_out_file, dev_null if quiet else sys.stdout)
+        exit_code = WebKitLandingScripts.run_command_with_teed_output(args, child_stdout)
+        if quiet:
+            dev_null.close()
+
+        child_output = child_out_file.getvalue()
+        child_out_file.close()
+
+        if exit_code:
+            raise ScriptError(script_args=args, exit_code=exit_code, output=child_output)
+
+    @classmethod
+    def run_webkit_script(cls, script_name, quiet=False, port=WebKitPort):
+        log("Running %s" % script_name)
+        cls.run_and_throw_if_fail(port.script_path(script_name), quiet)
+
+    @classmethod
+    def build_webkit(cls, quiet=False, port=WebKitPort):
+        log("Building WebKit")
+        cls.run_and_throw_if_fail(port.build_webkit_command(), quiet)
+
+    @staticmethod
+    def ensure_builders_are_green(buildbot, options):
+        if not options.check_builders or buildbot.core_builders_are_green():
+            return
+        error("Builders at %s are red, please do not commit.  Pass --ignore-builders to bypass this check." % (buildbot.buildbot_host))
+
+    @classmethod
+    def run_webkit_tests(cls, launch_safari, fail_fast=False, quiet=False, port=WebKitPort):
+        args = port.run_webkit_tests_command()
+        if not launch_safari:
+            args.append("--no-launch-safari")
+        if quiet:
+            args.append("--quiet")
+        if fail_fast:
+            args.append("--exit-after-n-failures=1")
+        cls.run_and_throw_if_fail(args)
+
+    @staticmethod
+    def prepare_clean_working_directory(scm, options, allow_local_commits=False):
+        os.chdir(scm.checkout_root)
+        if not allow_local_commits:
+            scm.ensure_no_local_commits(options.force_clean)
+        if options.clean:
+            scm.ensure_clean_working_directory(force_clean=options.force_clean)

-- 
WebKit Debian packaging



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