Check in the libxml roll script.

third_party/libxml/chromium/roll.py

Index: third_party/libxml/chromium/roll.py
diff --git a/third_party/libxml/chromium/roll.py b/third_party/libxml/chromium/roll.py
new file mode 100755
index 0000000000000000000000000000000000000000..3a6ac8bfc1b8044bc570d12e4855a224d45745de
--- /dev/null
+++ b/third_party/libxml/chromium/roll.py
@@ -0,0 +1,436 @@
+#!/usr/bin/env python
+
+# Copyright 2017 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+import argparse
+import os
+import os.path
+import shutil
+import subprocess
+import sys
+import tempfile
+
+# How to patch libxml2 in Chromium:
+#
+# 1. Write a .patch file and add it to third_party/libxml/chromium.
+# 2. Apply the patch in src: patch -p1 <../chromium/foo.patch
+# 3. Add the patch to the list of patches in this file.
+# 4. Update README.chromium with the provenance of the patch.
+# 5. Upload a change with the modified documentation, roll script,
+#    patch, applied patch and any other relevant changes like
+#    regression tests. Go through the usual review and commit process.
+#
+# How to roll libxml2 in Chromium:
+#
+# Prerequisites:
+#
+# 1. Check out Chromium somewhere on Linux, Mac and Windows.
+# 2. On each machine, add the experimental remote named 'wip':
+#    git remote add -f wip \
+#        https://chromium.googlesource.com/experimental/chromium/src
+# 3. On Linux:
+#    a. sudo apt-get install libicu-dev
+#    b. git clone git://git.gnome.org/libxml2 somewhere
+# 4. On Mac, install these MacPorts:
+#    autoconf automake libtool pkgconfig icu
+#
+# Procedure:
+#
+# Warning: This process is destructive. Run it on a clean branch.
+#
+# 1. On Linux, in the libxml2 repo directory:
+#    a. git remote update origin
+#    b. git checkout origin/master
+#
+#    This will be the upstream version of libxml you are rolling to.
+#
+# 2. On Linux, in the Chromium src director:
+#    a. third_party/libxml/chromium/roll.py --linux /path/to/libxml2
+#
+#    If this fails, it may be a patch no longer applies. Reset to
+#    head; modify the patch files, this script, and
+#    README.chromium; then commit the result and run it again.
+#
+#    b. git push -f wip HEAD:refs/wip/$USER/roll_libxml
+#
+# 2. On Windows, in the Chromium src directory:
+#    a. git fetch wip refs/wip/$USER/roll_libxml
+#    b. git checkout FETCH_HEAD
+#    c. third_party\libxml\chromium\roll.py --win32
+#    d. git push -f wip HEAD:refs/wip/$USER/roll_libxml
+#
+# 3. On Mac, in the Chromium src directory:
+#    a. git fetch wip refs/wip/$USER/roll_libxml
+#    b. git checkout -b roll_libxml_nnnn FETCH_HEAD
+#    c. git branch --set-upstream-to origin/master
+#    d. third_party/libxml/chromium/roll.py --mac
+#    e. Make and commit any final changes to README.chromium, BUILD.gn, etc.
+#    f. Complete the code review process as usual: git cl upload -d;
+#       git cl try-results; etc.
+
+patches = [

[Oliver Chang, 2017/04/06 01:09:24]

nit: maybe rename these global constants to uppercase?

+    'chromium-issue-599427.patch',
+    'chromium-issue-620679.patch',
+    'chromium-issue-628581.patch',
+    'chromium-issue-683629.patch',
+]
+
+
+# These two sets of options should be in sync. You can check the
+# generated #defines in (win32|mac|linux)/include/libxml.h to confirm
+# this.
+
+# See libxml2 configure.ac to learn what options are available.
+xml_configure_options = [
+    '--with-icu',
+    '--without-c14n',
+    '--without-catalog',
+    '--without-debug',
+    '--without-docbook',
+    '--without-ftp',
+    '--without-http',
+    '--without-iconv',
+    '--without-legacy',
+    '--without-lzma',
+    '--without-mem-debug',
+    '--without-modules',
+    '--without-readline',
+    '--without-regexps',
+    '--without-run-debug',
+    '--without-schemas',
+    '--without-schematron',
+    '--without-valid',
+    '--without-xinclude',
+    '--without-xptr',
+    '--without-zlib',
+    '--without-history',
+]
+
+
+# See libxml2 win32/configure.js to learn what options are available.
+xml_win32_configure_options = [

[Oliver Chang, 2017/04/06 01:09:24]

it seems a little difficult to me to make sure that the xml_configure_options
are kept in sync with the win32 one.

do you think it's worth doing something like:

xml_configure_options = [
   ('--with-icu', 'icu=yes'),
  ...
]

?

+    'icu=yes',
+

[Oliver Chang, 2017/04/06 01:09:24]

nit: extra newline?

+    'c14n=no',
+    'catalog=no',
+    'docb=no',
+    'ftp=no',
+    'http=no',
+    'iconv=no',
+    'legacy=no',
+    'lzma=no',
+    'mem_debug=no',
+    'modules=no',
+    'regexps=no',
+    'run_debug=no',
+    'schemas=no',
+    'schematron=no',
+    'valid=no',
+    'walker=no',
+    'xinclude=no',
+    'xml_debug=no',
+    'xptr=no',
+    'zlib=no',
+]
+
+
+third_party_libxml_src = 'third_party/libxml/src'
+
+
+class WorkingDir(object):
+    """"Changes the working directory and resets it on exit."""
+    def __init__(self, path):
+        self.prev_path = os.getcwd()
+        self.path = path
+
+    def __enter__(self):
+        os.chdir(self.path)
+
+    def __exit__(self, exc_type, exc_value, traceback):
+        if exc_value:
+            print('was in %s; %s before that' % (self.path, self.prev_path))
+        os.chdir(self.prev_path)
+
+
+def git(*args):
+    """Runs a git subcommand.
+
+    On Windows this uses the shell because there's a git wrapper
+    batch file in depot_tools.
+
+    Arguments:
+        args: The arguments to pass to git.
+    """
+    command = ['git'] + list(args)
+    subprocess.check_call(command, shell=(os.name == 'nt'))
+
+
+def remove_tracked_and_local_dir(path):
+    """Removes the contents of a directory from git, and the filesystem.
+
+    Arguments:
+        path: The path to remove.
+    """
+    remove_tracked_files([path])
+    shutil.rmtree(path, ignore_errors=True)
+    os.mkdir(path)
+
+
+def remove_tracked_files(files_to_remove):
+    """Removes tracked files from git.
+
+    Arguments:
+        files_to_remove: The files to remove.
+    """
+    files_to_remove = [f for f in files_to_remove if os.path.exists(f)]
+    git('rm', '-rf', *files_to_remove)
+
+
+def sed_in_place(input_filename, program):
+    """Replaces text in a file.
+
+    Arguments:
+        input_filename: The file to edit.
+        program: The sed program to perform edits on the file.
+    """
+    # OS X's sed requires -e
+    subprocess.check_call(['sed', '-i', '-e', program, input_filename])
+
+
+def check_copying(full_path_to_third_party_libxml_src):
+    path = os.path.join(full_path_to_third_party_libxml_src, 'COPYING')
+    if not os.path.exists(path):
+        return
+    with open(path) as f:
+        s = f.read()
+        if 'GNU' in s:
+            raise Exception('check COPYING')
+
+
+def prepare_libxml_distribution(libxml2_repo_path, temp_dir):
+    """Makes a libxml2 distribution.
+
+    Args:
+        libxml2_repo_path: The path to the local clone of the libxml2 repo.
+        temp_dir: A temporary directory to stage the distribution to.
+
+    Returns: A tuple of commit hash and full path to the archive.
+    """
+    # If it was necessary to push from a distribution prepared upstream,
+    # this is the point to inject it: Return the version string and the
+    # distribution tar file.
+
+    # The libxml2 repo we're pulling changes from should not have
+    # local changes. This *should* be a commit that's publicly visible
+    # in the upstream repo; reviewers should check this.
+    check_clean(libxml2_repo_path)
+
+    temp_config_path = os.path.join(temp_dir, 'config')
+    os.mkdir(temp_config_path)
+    temp_src_path = os.path.join(temp_dir, 'src')
+    os.mkdir(temp_src_path)
+
+    with WorkingDir(libxml2_repo_path):
+        commit = subprocess.check_output(
+            ['git', 'log', '-n', '1', '--pretty=format:%H', 'HEAD'])
+        subprocess.check_call(
+            'git archive HEAD | tar -x -C "%s"' % temp_src_path,
+            shell=True)
+    with WorkingDir(temp_src_path):
+        os.remove('.gitignore')
+    with WorkingDir(temp_config_path):
+        subprocess.check_call(['../src/autogen.sh'] + xml_configure_options)
+        subprocess.check_call(['make', 'dist-all'])
+
+        # Work out what it is called
+        tar_file = subprocess.check_output(
+            '''awk '/PACKAGE =/ {p=$3} /VERSION =/ {v=$3} '''
+            '''END {printf("%s-%s.tar.gz", p, v)}' Makefile''',
+            shell=True)
+        return commit, os.path.abspath(tar_file)
+
+
+def roll_libxml_linux(src_path, libxml2_repo_path):
+    with WorkingDir(src_path):
+        # Export the upstream git repo.
+        try:
+            temp_dir = tempfile.mkdtemp()
+            print('temporary directory: %s' % temp_dir)
+
+            commit, tar_file = prepare_libxml_distribution(libxml2_repo_path,
+                                                           temp_dir)
+
+            # Remove all of the old libxml to ensure only desired cruft
+            # accumulates
+            remove_tracked_and_local_dir(third_party_libxml_src)
+
+            # Update the libxml repo and export it to the Chromium tree
+            with WorkingDir(third_party_libxml_src):
+                subprocess.check_call(
+                    'tar xzf %s --strip-components=1' % tar_file,
+                    shell=True)
+        finally:
+            shutil.rmtree(temp_dir)
+
+        with WorkingDir(third_party_libxml_src):
+            # Put the version number is the README file
+            sed_in_place('../README.chromium',
+                         's/Version: .*$/Version: %s/' % commit)
+
+            for patch in patches:
+                subprocess.check_call('cat ../chromium/%s | patch -p1' % patch,
+                                      shell=True)
+
+            with WorkingDir('../linux'):
+                subprocess.check_call(
+                    ['../src/autogen.sh'] + xml_configure_options)
+                check_copying(os.getcwd())
+                sed_in_place('config.h', 's/#define HAVE_RAND_R 1//')
+
+            # Add *everything*
+            with WorkingDir('../src'):
+                git('add', '*')
+                git('commit', '-am', '%s libxml, linux' % commit)
+    print('Now push to Windows and run steps there.')
+
+
+def roll_libxml_win32(src_path):
+    with WorkingDir(src_path):
+        # Run the configure script.
+        with WorkingDir(os.path.join(third_party_libxml_src, 'win32')):
+            subprocess.check_call(
+                ['cscript', '//E:jscript', 'configure.js', 'compiler=msvc'] +
+                xml_win32_configure_options)
+
+            # Add and commit the result.
+            shutil.move('VC10/config.h', '../../win32/config.h')
+            git('add', '../../win32/config.h')
+            shutil.move('../include/libxml/xmlversion.h',
+                        '../../win32/include/libxml/xmlversion.h')
+            git('add', '../../win32/include/libxml/xmlversion.h')
+            git('commit', '-m', 'Windows')
+            git('clean', '-f')
+    print('Now push to Mac and run steps there.')
+
+
+def roll_libxml_mac(src_path):
+    full_path_to_third_party_libxml = os.path.join(
+        src_path, third_party_libxml_src, '..')
+
+    with WorkingDir(os.path.join(full_path_to_third_party_libxml, 'mac')):
+        subprocess.check_call(['autoreconf', '-i', '../src'])
+        subprocess.check_call(['../src/configure'] + xml_configure_options)
+        sed_in_place('config.h', 's/#define HAVE_RAND_R 1//')
+
+    with WorkingDir(full_path_to_third_party_libxml):
+        commit = subprocess.check_output(['awk', '/Version:/ {print $2}',
+                                          'README.chromium'])
+        files_to_remove = [

[Oliver Chang, 2017/04/06 01:09:24]

nit: maybe put this at the top with all the other constants?

+            'src/DOCBparser.c',
+            'src/HACKING',
+            'src/INSTALL.libxml2',
+            'src/MAINTAINERS',
+            'src/Makefile.win',
+            'src/README.cvs-commits',
+            # This is unneeded "legacy" SAX API, even though we enable SAX1.
+            'src/SAX.c',
+            'src/VxWorks',
+            'src/autogen.sh',
+            'src/autom4te.cache',
+            'src/bakefile',
+            'src/build_glob.py',
+            'src/c14n.c',
+            'src/catalog.c',
+            'src/chvalid.def',
+            'src/debugXML.c',
+            'src/doc',
+            'src/example',
+            'src/genChRanges.py',
+            'src/global.data',
+            'src/include/libxml/xmlversion.h',
+            'src/include/libxml/xmlwin32version.h',
+            'src/include/libxml/xmlwin32version.h.in',
+            'src/legacy.c',
+            'src/libxml2.doap',
+            'src/macos/libxml2.mcp.xml.sit.hqx',
+            'src/optim',
+            'src/os400',
+            'src/python',
+            'src/relaxng.c',
+            'src/result',
+            'src/rngparser.c',
+            'src/schematron.c',
+            'src/test',
+            'src/testOOM.c',
+            'src/testOOMlib.c',
+            'src/testOOMlib.h',
+            'src/trio.c',
+            'src/trio.h',
+            'src/triop.h',
+            'src/triostr.c',
+            'src/triostr.h',
+            'src/vms',
+            'src/win32/VC10/config.h',
+            'src/win32/wince',
+            'src/xinclude.c',
+            'src/xlink.c',
+            'src/xml2-config.in',
+            'src/xmlcatalog.c',
+            'src/xmllint.c',
+            'src/xmlmodule.c',
+            'src/xmlregexp.c',
+            'src/xmlschemas.c',
+            'src/xmlschemastypes.c',
+            'src/xpointer.c',
+            'src/xstc',
+            'src/xzlib.c',
+        ]
+        remove_tracked_files(files_to_remove)
+        commit_message = 'Roll libxml to %s' % commit
+        git('commit', '-am', commit_message)
+    print('Now upload for review, etc.')
+
+
+def check_clean(path):
+    with WorkingDir(path):
+        status = subprocess.check_output(['git', 'status', '-s'])
+        if len(status) > 0:
+            raise Exception('repository at %s is not clean' % path)
+
+
+def main():
+    src_dir = os.getcwd()
+    if not os.path.exists(os.path.join(src_dir, 'third_party')):
+        print('error: run this script from the Chromium src directory')
+        sys.exit(1)
+
+    parser = argparse.ArgumentParser(
+        description='Roll the libxml2 dependency in Chromium')
+    platform = parser.add_mutually_exclusive_group(required=True)
+    platform.add_argument('--linux', action='store_true')
+    platform.add_argument('--win32', action='store_true')
+    platform.add_argument('--mac', action='store_true')
+    parser.add_argument(
+        'libxml2_repo_path',
+        type=str,
+        nargs='?',
+        help='The path to the local clone of the libxml2 git repo.')
+    args = parser.parse_args()
+
+    if args.linux:
+        libxml2_repo_path = args.libxml2_repo_path
+        if not libxml2_repo_path:
+            print('Specify the path to the local libxml2 repo clone.')
+            sys.exit(1)
+        libxml2_repo_path = os.path.abspath(libxml2_repo_path)
+        roll_libxml_linux(src_dir, libxml2_repo_path)
+    elif args.win32:
+        roll_libxml_win32(src_dir)
+    elif args.mac:
+        roll_libxml_mac(src_dir)
+
+
+if __name__ == '__main__':
+    main()