git-repo/subcmds/start.py
Shawn O. Pearce 89e717d948 Improve checkout performance for the common unmodified case
Most projects will have their branch heads matching in all branches,
so switching between them should be just a matter of updating the
work tree's HEAD symref.  This can be done in pure Python, saving
quite a bit of time over forking 'git checkout'.

Signed-off-by: Shawn O. Pearce <sop@google.com>
2009-04-18 15:04:41 -07:00

57 lines
1.5 KiB
Python

#
# Copyright (C) 2008 The Android Open Source Project
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
import sys
from command import Command
from git_command import git
from progress import Progress
class Start(Command):
common = True
helpSummary = "Start a new branch for development"
helpUsage = """
%prog <newbranchname> [<project>...]
"""
helpDescription = """
'%prog' begins a new branch of development, starting from the
revision specified in the manifest.
"""
def Execute(self, opt, args):
if not args:
self.Usage()
nb = args[0]
if not git.check_ref_format('heads/%s' % nb):
print >>sys.stderr, "error: '%s' is not a valid name" % nb
sys.exit(1)
err = []
all = self.GetProjects(args[1:])
pm = Progress('Starting %s' % nb, len(all))
for project in all:
pm.update()
if not project.StartBranch(nb):
err.append(project)
pm.end()
if err:
for p in err:
print >>sys.stderr,\
"error: %s/: cannot start %s" \
% (p.relpath, nb)
sys.exit(1)