Merge changes Ib8bdaa14,I62380485,I6cbedbd2

am: b7f136bed4

Change-Id: I2f39f0c70b27c5143676247fa0a86deb0999a5f4

tools/repo_pull/README.md

@@ -72,8 +72,8 @@ These are common queries:
 * `-g` or `--gerrit` specifies the URL of the Gerrit Code Review website.
   *(required)*
 
-* `-b` or `--branch` specifies the local topic branch name that will be passed
-  to `repo start`.
+* `-b` or `--branch` specifies the local branch name that will be passed to
+  `repo start`.
 
 * `-j` or `--parallel` specifies the number of parallel threads while pulling
   change lists.
@@ -81,6 +81,19 @@ These are common queries:
 * `-n` or `--limits` specifies the maximum number of change lists.  (default:
   1000)
 
+* `-m` or `--merge` specifies the method to pick the merge commits.  (default:
+  `merge-ff-only`)
+
+* `-p` or `--pick` specifies the method to pick the non-merge commits.
+  (default: `pick`)
+
+  * `pick` maps to `git cherry-pick --allow-empty`
+  * `merge` maps to `git merge --no-edit`
+  * `merge-ff-only` maps to `git merge --no-edit --ff-only`
+  * `merge-no-ff` maps to `git merge --no-edit --no-ff`
+  * `reset` maps to `git reset --hard`
+  * `checkout` maps to `git checkout`
+
 
 ## Examples
 

tools/repo_pull/repo_pull.py

@@ -40,6 +40,11 @@ try:
 except ImportError:
     from urllib2 import HTTPBasicAuthHandler, build_opener  # PY2
 
+try:
+    from __builtin__ import raw_input as input  # PY2
+except ImportError:
+    pass
+
 try:
     from shlex import quote as _sh_quote  # PY3.3
 except ImportError:
@@ -96,6 +101,18 @@ else:
         file.buffer.write(data)
 
 
+def _confirm(question, default, file=sys.stderr):
+    """Prompt a yes/no question and convert the answer to a boolean value."""
+    answers = {'': default, 'y': True, 'yes': True, 'n': False, 'no': False}
+    suffix = '[Y/n] ' if default else ' [y/N] '
+    while True:
+        file.write(question + suffix)
+        file.flush()
+        ans = answers.get(input().lower())
+        if ans is not None:
+            return ans
+
+
 class ChangeList(object):
     """A ChangeList to be checked out."""
 
@@ -260,20 +277,33 @@ _MERGE_COMMANDS = {
     'merge-ff-only': ['git', 'merge', '--no-edit', '--ff-only'],
     'merge-no-ff': ['git', 'merge', '--no-edit', '--no-ff'],
     'reset': ['git', 'reset', '--hard'],
+    'checkout': ['git', 'checkout'],
 }
 
 
-def build_pull_commands(change, branch_name, merge_opt):
+# Git commands for non-merge commits
+_PICK_COMMANDS = {
+    'pick': ['git', 'cherry-pick', '--allow-empty'],
+    'merge': ['git', 'merge', '--no-edit'],
+    'merge-ff-only': ['git', 'merge', '--no-edit', '--ff-only'],
+    'merge-no-ff': ['git', 'merge', '--no-edit', '--no-ff'],
+    'reset': ['git', 'reset', '--hard'],
+    'checkout': ['git', 'checkout'],
+}
+
+
+def build_pull_commands(change, branch_name, merge_opt, pick_opt):
     """Build command lines for each change.  The command lines will be passed
     to subprocess.run()."""
 
     cmds = []
-    cmds.append(['repo', 'start', branch_name])
+    if branch_name is not None:
+        cmds.append(['repo', 'start', branch_name])
     cmds.append(['git', 'fetch', change.fetch_url, change.fetch_ref])
     if change.is_merge():
         cmds.append(_MERGE_COMMANDS[merge_opt] + ['FETCH_HEAD'])
     else:
-        cmds.append(['git', 'cherry-pick', '--allow-empty', 'FETCH_HEAD'])
+        cmds.append(_PICK_COMMANDS[pick_opt] + ['FETCH_HEAD'])
     return cmds
 
 
@@ -292,7 +322,7 @@ def _sh_quote_commands(cmds):
 def _main_bash(args):
     """Print the bash command to pull the change lists."""
 
-    branch_name = _get_topic_branch_from_args(args)
+    branch_name = _get_local_branch_name_from_args(args)
 
     manifest_path = _get_manifest_xml_from_args(args)
     project_dirs = build_project_name_to_directory_dict(manifest_path)
@@ -304,7 +334,8 @@ def _main_bash(args):
         for change in changes:
             cmds = []
             cmds.append(['pushd', change.project_dir])
-            cmds.extend(build_pull_commands(change, branch_name, args.merge))
+            cmds.extend(build_pull_commands(
+                change, branch_name, args.merge, args.pick))
             cmds.append(['popd'])
             print(_sh_quote_commands(cmds))
 
@@ -315,11 +346,13 @@ def _do_pull_change_lists_for_project(task):
 
     branch_name = task_opts['branch_name']
     merge_opt = task_opts['merge_opt']
+    pick_opt = task_opts['pick_opt']
 
     for i, change in enumerate(changes):
         cwd = change.project_dir
         print(change.commit_sha1[0:10], i + 1, cwd)
-        for cmd in build_pull_commands(change, branch_name, merge_opt):
+        cmds = build_pull_commands(change, branch_name, merge_opt, pick_opt)
+        for cmd in cmds:
             proc = run(cmd, cwd=cwd, stderr=PIPE)
             if proc.returncode != 0:
                 return (change, changes[i + 1:], cmd, proc.stderr)
@@ -329,7 +362,7 @@ def _do_pull_change_lists_for_project(task):
 def _main_pull(args):
     """Pull the change lists."""
 
-    branch_name = _get_topic_branch_from_args(args)
+    branch_name = _get_local_branch_name_from_args(args)
 
     manifest_path = _get_manifest_xml_from_args(args)
     project_dirs = build_project_name_to_directory_dict(manifest_path)
@@ -342,6 +375,7 @@ def _main_pull(args):
     task_opts = {
         'branch_name': branch_name,
         'merge_opt': args.merge,
+        'pick_opt': args.pick,
     }
 
     # Run the commands to pull the change lists
@@ -391,12 +425,17 @@ def _parse_args():
                         help='Max number of change lists')
 
     parser.add_argument('-m', '--merge',
-                        choices=_MERGE_COMMANDS.keys(),
+                        choices=sorted(_MERGE_COMMANDS.keys()),
                         default='merge-ff-only',
                         help='Method to pull merge commits')
 
+    parser.add_argument('-p', '--pick',
+                        choices=sorted(_PICK_COMMANDS.keys()),
+                        default='pick',
+                        help='Method to pull merge commits')
+
     parser.add_argument('-b', '--branch',
-                        help='Topic branch name to start with')
+                        help='Local branch name for `repo start`')
 
     parser.add_argument('-j', '--parallel', default=1, type=int,
                         help='Number of parallel running commands')
@@ -418,10 +457,11 @@ def _get_change_lists_from_args(args):
                               args.limits)
 
 
-def _get_topic_branch_from_args(args):
-    """Get the topic branch name from args."""
-    if not args.branch:
-        print('error: --branch must be specified')
+def _get_local_branch_name_from_args(args):
+    """Get the local branch name from args."""
+    if not args.branch and not _confirm(
+            'Do you want to continue without local branch name?', False):
+        print('error: `-b` or `--branch` must be specified', file=sys.stderr)
         sys.exit(1)
     return args.branch