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1# Copyright (C) 2011 Google Inc. All rights reserved.
2#
3# Redistribution and use in source and binary forms, with or without
4# modification, are permitted provided that the following conditions are
5# met:
6#
7#     * Redistributions of source code must retain the above copyright
8# notice, this list of conditions and the following disclaimer.
9#     * Redistributions in binary form must reproduce the above
10# copyright notice, this list of conditions and the following disclaimer
11# in the documentation and/or other materials provided with the
12# distribution.
13#     * Neither the name of Google Inc. nor the names of its
14# contributors may be used to endorse or promote products derived from
15# this software without specific prior written permission.
16#
17# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
18# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
19# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
20# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
21# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
22# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
23# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
24# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
25# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
26# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
27# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28
29import urllib2
30
31from webkitpy.tool.steps.abstractstep import AbstractStep
32from webkitpy.tool.steps.options import Options
33from webkitpy.common.config import urls
34from webkitpy.common.system.deprecated_logging import log, error
35
36
37class UpdateChromiumDEPS(AbstractStep):
38    # Notice that this method throws lots of exciting exceptions!
39    def _fetch_last_known_good_revision(self):
40        return int(urllib2.urlopen(urls.chromium_lkgr_url).read())
41
42    def _validate_revisions(self, current_chromium_revision, new_chromium_revision):
43        if new_chromium_revision < current_chromium_revision:
44            log("Current Chromium DEPS revision %s is newer than %s." % (current_chromium_revision, new_chromium_revision))
45            new_chromium_revision = self._tool.user.prompt("Enter new chromium revision (enter nothing to cancel):\n")
46            try:
47                new_chromium_revision = int(new_chromium_revision)
48            except ValueError, TypeError:
49                new_chromium_revision = None
50            if not new_chromium_revision:
51                error("Unable to update Chromium DEPS")
52
53
54    def run(self, state):
55        # Note that state["chromium_revision"] must be defined, but can be None.
56        new_chromium_revision = state["chromium_revision"]
57        if not new_chromium_revision:
58            new_chromium_revision = self._fetch_last_known_good_revision()
59
60        deps = self._tool.checkout().chromium_deps()
61        current_chromium_revision = deps.read_variable("chromium_rev")
62        self._validate_revisions(current_chromium_revision, new_chromium_revision)
63        log("Updating Chromium DEPS to %s" % new_chromium_revision)
64        deps.write_variable("chromium_rev", new_chromium_revision)
65