ref: a291bbdeddfd41a2f0907ecbd7b819f0eedffdaf
dir: /sys/src/cmd/hg/mercurial/streamclone.py/
# streamclone.py - streaming clone server support for mercurial
#
# Copyright 2006 Vadim Gelfer <[email protected]>
#
# This software may be used and distributed according to the terms of the
# GNU General Public License version 2, incorporated herein by reference.
import util, error
from i18n import _
from mercurial import store
class StreamException(Exception):
def __init__(self, code):
Exception.__init__(self)
self.code = code
def __str__(self):
return '%i\n' % self.code
# if server supports streaming clone, it advertises "stream"
# capability with value that is version+flags of repo it is serving.
# client only streams if it can read that repo format.
# stream file format is simple.
#
# server writes out line that says how many files, how many total
# bytes. separator is ascii space, byte counts are strings.
#
# then for each file:
#
# server writes out line that says filename, how many bytes in
# file. separator is ascii nul, byte count is string.
#
# server writes out raw file data.
def stream_out(repo, untrusted=False):
'''stream out all metadata files in repository.
writes to file-like object, must support write() and optional flush().'''
if not repo.ui.configbool('server', 'uncompressed', untrusted=untrusted):
raise StreamException(1)
entries = []
total_bytes = 0
try:
# get consistent snapshot of repo, lock during scan
lock = repo.lock()
try:
repo.ui.debug(_('scanning\n'))
for name, ename, size in repo.store.walk():
# for backwards compat, name was partially encoded
entries.append((store.encodedir(name), size))
total_bytes += size
finally:
lock.release()
except error.LockError:
raise StreamException(2)
yield '0\n'
repo.ui.debug(_('%d files, %d bytes to transfer\n') %
(len(entries), total_bytes))
yield '%d %d\n' % (len(entries), total_bytes)
for name, size in entries:
repo.ui.debug(_('sending %s (%d bytes)\n') % (name, size))
yield '%s\0%d\n' % (name, size)
for chunk in util.filechunkiter(repo.sopener(name), limit=size):
yield chunk