delete git migrate-default-branch command

I believe this is needed for master->main migration and should no
longer needed.

Change-Id: I75ef8d5bfcf76a862c95c227d6bc9616176c1df1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/5540888
Reviewed-by: Josip Sokcevic <sokcevic@chromium.org>
Commit-Queue: Yiwei Zhang <yiwzhang@google.com>

git-migrate-default-branch

@@ -1,6 +0,0 @@
-#!/usr/bin/env bash
-# Copyright 2020 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.
-
-. "$(type -P python_runner.sh)"

git_migrate_default_branch.py

@@ -1,101 +0,0 @@
-#!/usr/bin/env vpython3
-# Copyright 2020 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.
-"""Migrate local repository onto new default branch."""
-
-import gerrit_util
-import git_common
-import metrics
-import scm
-import sys
-import logging
-import urllib.parse
-
-
-def GetGerritProject(remote_url):
-    """Returns Gerrit project name based on remote git URL."""
-    if remote_url is None:
-        raise RuntimeError('can\'t detect Gerrit project.')
-    project = urllib.parse.urlparse(remote_url).path.strip('/')
-    if project.endswith('.git'):
-        project = project[:-len('.git')]
-    # *.googlesource.com hosts ensure that Git/Gerrit projects don't start with
-    # 'a/' prefix, because 'a/' prefix is used to force authentication in
-    # gitiles/git-over-https protocol. E.g.,
-    # https://chromium.googlesource.com/a/v8/v8 refers to the same repo/project
-    # as
-    # https://chromium.googlesource.com/v8/v8
-    if project.startswith('a/'):
-        project = project[len('a/'):]
-    return project
-
-
-def GetGerritHost(git_host):
-    parts = git_host.split('.')
-    parts[0] = parts[0] + '-review'
-    return '.'.join(parts)
-
-
-def main():
-    remote = git_common.run('remote')
-    # Use first remote as source of truth
-    remote = remote.split("\n")[0]
-    if not remote:
-        raise RuntimeError('Could not find any remote')
-    url = scm.GIT.GetConfig(git_common.repo_root(), 'remote.%s.url' % remote)
-    host = urllib.parse.urlparse(url).netloc
-    if not host:
-        raise RuntimeError('Could not find remote host')
-
-    project_head = gerrit_util.GetProjectHead(GetGerritHost(host),
-                                              GetGerritProject(url))
-    if project_head != 'refs/heads/main':
-        raise RuntimeError("The repository is not migrated yet.")
-
-    # User may have set to fetch only old default branch. Ensure fetch is
-    # tracking main too.
-    git_common.run('config', '--unset-all', 'remote.origin.fetch',
-                   'refs/heads/*')
-    git_common.run('config', '--add', 'remote.origin.fetch',
-                   '+refs/heads/*:refs/remotes/origin/*')
-    logging.info("Running fetch...")
-    git_common.run('fetch', remote)
-    logging.info("Updating remote HEAD...")
-    git_common.run('remote', 'set-head', '-a', remote)
-
-    branches = git_common.get_branches_info(True)
-
-    if 'master' in branches:
-        logging.info("Migrating master branch...")
-        if 'main' in branches:
-            logging.info(
-                'You already have master and main branch, consider removing '
-                'master manually:\n'
-                ' $ git branch -d master\n')
-        else:
-            git_common.run('branch', '-m', 'master', 'main')
-        branches = git_common.get_branches_info(True)
-
-    for name in branches:
-        branch = branches[name]
-        if not branch:
-            continue
-
-        if 'master' in branch.upstream:
-            logging.info("Migrating %s branch..." % name)
-            new_upstream = branch.upstream.replace('master', 'main')
-            git_common.run('branch', '--set-upstream-to', new_upstream, name)
-            git_common.remove_merge_base(name)
-
-
-if __name__ == '__main__':
-    logging.basicConfig(level=logging.INFO)
-    with metrics.collector.print_notice_and_exit():
-        try:
-            logging.info("Starting migration")
-            main()
-            logging.info("Migration completed")
-        except RuntimeError as e:
-            logging.error("Error %s" % str(e))
-            sys.exit(1)

tests/git_migrate_default_branch_test.py

@@ -1,98 +0,0 @@
-#!/usr/bin/env vpython3
-# Copyright 2020 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.
-"""Unit tests for git_migrate_default_branch.py."""
-
-import collections
-import os
-import sys
-import unittest
-from unittest import mock
-
-sys.path.insert(0, os.path.dirname(os.path.dirname(os.path.abspath(__file__))))
-
-import git_migrate_default_branch
-
-
-class CMDFormatTestCase(unittest.TestCase):
-    def setUp(self):
-        self.addCleanup(mock.patch.stopall)
-
-    def test_no_remote(self):
-        def RunMock(*args):
-            if args[0] == 'remote':
-                return ''
-            self.fail('did not expect such run git command: %s' % args[0])
-
-        mock.patch('git_migrate_default_branch.git_common.run', RunMock).start()
-        with self.assertRaisesRegexp(RuntimeError, 'Could not find any remote'):
-            git_migrate_default_branch.main()
-
-    def test_migration_not_ready(self):
-        def RunMock(*args):
-            if args[0] == 'remote':
-                return 'origin\ngerrit'
-            raise Exception('Did not expect such run git command: %s' % args[0])
-
-        mock.patch('git_migrate_default_branch.git_common.run', RunMock).start()
-        mock.patch('git_migrate_default_branch.git_common.repo_root',
-                   return_value='.').start()
-        mock.patch('git_migrate_default_branch.scm.GIT.GetConfig',
-                   return_value='https://chromium.googlesource.com').start()
-        mock.patch('git_migrate_default_branch.gerrit_util.GetProjectHead',
-                   return_value=None).start()
-        with self.assertRaisesRegexp(RuntimeError, 'not migrated yet'):
-            git_migrate_default_branch.main()
-
-    def test_migration_no_master(self):
-        def RunMock(*args):
-            if args[0] == 'remote':
-                return 'origin\ngerrit'
-
-            if args[0] == 'fetch':
-                return
-
-            if args[0] == 'branch':
-                return
-
-            if args[0] == 'config':
-                return
-            raise Exception('Did not expect such run git command: %s' % args[0])
-
-        mock_runs = mock.patch('git_migrate_default_branch.git_common.run',
-                               side_effect=RunMock).start()
-        mock.patch('git_migrate_default_branch.git_common.repo_root',
-                   return_value='.').start()
-        mock.patch('git_migrate_default_branch.scm.GIT.GetConfig',
-                   return_value='https://chromium.googlesource.com').start()
-        mock.patch('git_migrate_default_branch.gerrit_util.GetProjectHead',
-                   return_value='refs/heads/main').start()
-
-        BranchesInfo = collections.namedtuple('BranchesInfo',
-                                              'hash upstream commits behind')
-        branches = {
-            '': None,  # always returned
-            'master': BranchesInfo('0000', 'origin/master', '0', '0'),
-            'feature': BranchesInfo('0000', 'master', '0', '0'),
-            'another_feature': BranchesInfo('0000', 'feature', '0', '0'),
-            'remote_feature': BranchesInfo('0000', 'origin/master', '0', '0'),
-        }
-        mock.patch('git_migrate_default_branch.git_common.get_branches_info',
-                   return_value=branches).start()
-        mock_merge_base = mock.patch(
-            'git_migrate_default_branch.git_common.remove_merge_base',
-            return_value=branches).start()
-
-        git_migrate_default_branch.main()
-        mock_merge_base.assert_any_call('feature')
-        mock_merge_base.assert_any_call('remote_feature')
-        mock_runs.assert_any_call('branch', '-m', 'master', 'main')
-        mock_runs.assert_any_call('branch', '--set-upstream-to', 'main',
-                                  'feature')
-        mock_runs.assert_any_call('branch', '--set-upstream-to', 'origin/main',
-                                  'remote_feature')
-
-
-if __name__ == '__main__':
-    unittest.main()