|
|
# streamclone.py - streaming clone server support for mercurial
|
|
|
#
|
|
|
# Copyright 2006 Vadim Gelfer <vadim.gelfer@gmail.com>
|
|
|
#
|
|
|
# This software may be used and distributed according to the terms
|
|
|
# of the GNU General Public License, incorporated herein by reference.
|
|
|
|
|
|
import os, osutil, stat, util, lock
|
|
|
|
|
|
# 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.
|
|
|
|
|
|
def walkrepo(root):
|
|
|
'''iterate over metadata files in repository.
|
|
|
walk in natural (sorted) order.
|
|
|
yields 2-tuples: name of .d or .i file, size of file.'''
|
|
|
|
|
|
strip_count = len(root) + len(os.sep)
|
|
|
def walk(path, recurse):
|
|
|
for e, kind, st in osutil.listdir(path, stat=True):
|
|
|
pe = os.path.join(path, e)
|
|
|
if kind == stat.S_IFDIR:
|
|
|
if recurse:
|
|
|
for x in walk(pe, True):
|
|
|
yield x
|
|
|
else:
|
|
|
if kind != stat.S_IFREG or len(e) < 2:
|
|
|
continue
|
|
|
sfx = e[-2:]
|
|
|
if sfx in ('.d', '.i'):
|
|
|
yield pe[strip_count:], st.st_size
|
|
|
# write file data first
|
|
|
for x in walk(os.path.join(root, 'data'), True):
|
|
|
yield x
|
|
|
# write manifest before changelog
|
|
|
meta = list(walk(root, False))
|
|
|
meta.sort()
|
|
|
meta.reverse()
|
|
|
for x in meta:
|
|
|
yield x
|
|
|
|
|
|
# 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 file name, how many bytes in
|
|
|
# file. separator is ascii nul, byte count is string.
|
|
|
#
|
|
|
# server writes out raw file data.
|
|
|
|
|
|
def stream_out(repo, fileobj, 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):
|
|
|
fileobj.write('1\n')
|
|
|
return
|
|
|
|
|
|
# get consistent snapshot of repo. lock during scan so lock not
|
|
|
# needed while we stream, and commits can happen.
|
|
|
repolock = None
|
|
|
try:
|
|
|
try:
|
|
|
repolock = repo.lock()
|
|
|
except (lock.LockHeld, lock.LockUnavailable), inst:
|
|
|
repo.ui.warn('locking the repository failed: %s\n' % (inst,))
|
|
|
fileobj.write('2\n')
|
|
|
return
|
|
|
|
|
|
fileobj.write('0\n')
|
|
|
repo.ui.debug('scanning\n')
|
|
|
entries = []
|
|
|
total_bytes = 0
|
|
|
for name, size in walkrepo(repo.spath):
|
|
|
name = repo.decodefn(util.pconvert(name))
|
|
|
entries.append((name, size))
|
|
|
total_bytes += size
|
|
|
finally:
|
|
|
del repolock
|
|
|
|
|
|
repo.ui.debug('%d files, %d bytes to transfer\n' %
|
|
|
(len(entries), total_bytes))
|
|
|
fileobj.write('%d %d\n' % (len(entries), total_bytes))
|
|
|
for name, size in entries:
|
|
|
repo.ui.debug('sending %s (%d bytes)\n' % (name, size))
|
|
|
fileobj.write('%s\0%d\n' % (name, size))
|
|
|
for chunk in util.filechunkiter(repo.sopener(name), limit=size):
|
|
|
fileobj.write(chunk)
|
|
|
flush = getattr(fileobj, 'flush', None)
|
|
|
if flush: flush()
|
|
|
|
