merge: do early copy to deal with issue636
Without copies/renames, merges source names are 1:1 with their
targets. Copies and renames introduce the possibility that there will
be two merges with the same input but different output. By doing the
copy to the destination name before the merge, the actual merge
becomes 1:1 again, and no source is the input to two different merges.
- add a preliminary scan to applyupdates to do copies
- for the merge action, pass the old name (for finding ancestors) and
the new name (for input to the merge) to filemerge
- eliminate the old post-merge copy
- lookup file contents from new name in filemerge
- pass new name to external merge helper
- report merge failure at new name
- add a test
# 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.
from i18n import _
import os, 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):
ents = os.listdir(path)
ents.sort()
for e in ents:
pe = os.path.join(path, e)
st = os.lstat(pe)
if stat.S_ISDIR(st.st_mode):
if recurse:
for x in walk(pe, True):
yield x
else:
if not stat.S_ISREG(st.st_mode) 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.
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
repolock.release()
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()