Mercurial > hg > mercurial-crew-with-dirclash
view mercurial/streamclone.py @ 2814:0496cfb05243
fetch: lock repo across pull and commit
author | Vadim Gelfer <vadim.gelfer@gmail.com> |
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date | Tue, 08 Aug 2006 16:40:08 -0700 |
parents | d1cbfe9e13cd |
children | d5dd0a2a44bc |
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# 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 demandload import demandload from i18n import gettext as _ demandload(globals(), "os stat util") # 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): '''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'): fileobj.write('1\n') return fileobj.write('0\n') # get consistent snapshot of repo. lock during scan so lock not # needed while we stream, and commits can happen. lock = repo.lock() repo.ui.debug('scanning\n') entries = [] total_bytes = 0 for name, size in walkrepo(repo.path): entries.append((name, size)) total_bytes += size lock.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.opener(name), limit=size): fileobj.write(chunk) flush = getattr(fileobj, 'flush', None) if flush: flush()