Add gclient conversion script.

Bug: 1415507
Change-Id: I6e8c59f0089bd8108be5967245d47effd96b4036
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/4402816
Commit-Queue: Joanna Wang <jojwang@chromium.org>
Reviewed-by: Gavin Mak <gavinmak@google.com>

fetch_configs/infra.py

@@ -17,6 +17,7 @@ class Infra(config_util.Config):
     return {
         'alias': {
             'config': 'infra_superproject',
+            'props': [],
         },
     }
 

infra_to_superproject.py

@@ -0,0 +1,74 @@
+#!/usr/bin/env python3
+# Copyright (c) 2023 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.
+"""
+Creates a new infra_superpoject gclient checkout based on an existing
+infra or infra_internal checkout.
+
+  Usage:
+
+  (1) Commit any WIP changes in all infra repos:
+      `git commit -a -v -m "another commit" OR `git commit -a -v --amend`
+
+  (2) Run `git rebase-update` and `gclient sync` and ensure all conflicts
+      are resolved.
+
+  (3) In your gclient root directory (the one that contains a .gclient file),
+      run:
+      `python3 path/to/depot_tools/infra_to_superproject.py <destination>`
+      example:
+     `cd ~/cr`  # gclient root dir
+     `python3 depot_tools/infra_to_superproject.py ~/cr2`
+
+  (4) `cd <destination>` and check that everything looks like your original
+      gclient checkout. The file structure should be the same, your branches
+      and commits in repos should be copied over.
+
+  (5) `sudo rm -rf <old_directory_name>`
+      example:
+      `sudo rm -rf cr`
+
+  (6) `mv <destination> <old_directory_name>`
+      example:
+      `mv cr2 cr
+
+"""
+
+import subprocess
+import os
+import sys
+import json
+from pathlib import Path
+
+
+def main(argv):
+  assert len(argv) == 1, 'One and only one arg expected.'
+  destination = argv[0]
+
+  # In case there is '~' in the destination string
+  destination = os.path.expanduser(destination)
+
+  Path(destination).mkdir(parents=True, exist_ok=True)
+
+  cp = subprocess.Popen(['cp', '-a', os.getcwd() + '/.', destination])
+  cp.wait()
+
+  gclient_file = os.path.join(destination, '.gclient')
+  with open(gclient_file, 'r') as file:
+    data = file.read()
+    internal = "infra_internal" in data
+
+  os.remove(gclient_file)
+
+  cmds = ['fetch', '--force']
+  if internal:
+    cmds.append('infra_internal')
+  else:
+    cmds.append('infra')
+  fetch = subprocess.Popen(cmds, cwd=destination)
+  fetch.wait()
+
+
+if __name__ == '__main__':
+  sys.exit(main(sys.argv[1:]))