mercurial/streamclone.py
author Benoit Boissinot <benoit.boissinot@ens-lyon.org>
Tue, 28 Nov 2006 21:16:05 +0100
changeset 3721 98f2507c5551
parent 3687 d5dd0a2a44bc
child 3791 8643b9f90b51
permissions -rw-r--r--
only print a warning when no username is specified - revert most of 8b55c0ba - display the username during interactive commit
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# streamclone.py - streaming clone server support for mercurial
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#
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# Copyright 2006 Vadim Gelfer <vadim.gelfer@gmail.com>
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#
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# This software may be used and distributed according to the terms
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# of the GNU General Public License, incorporated herein by reference.
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from demandload import demandload
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from i18n import gettext as _
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demandload(globals(), "os stat util lock")
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# if server supports streaming clone, it advertises "stream"
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# capability with value that is version+flags of repo it is serving.
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# client only streams if it can read that repo format.
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def walkrepo(root):
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    '''iterate over metadata files in repository.
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    walk in natural (sorted) order.
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    yields 2-tuples: name of .d or .i file, size of file.'''
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    strip_count = len(root) + len(os.sep)
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    def walk(path, recurse):
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        ents = os.listdir(path)
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        ents.sort()
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        for e in ents:
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            pe = os.path.join(path, e)
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            st = os.lstat(pe)
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            if stat.S_ISDIR(st.st_mode):
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                if recurse:
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                    for x in walk(pe, True):
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                        yield x
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            else:
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                if not stat.S_ISREG(st.st_mode) or len(e) < 2:
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                    continue
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                sfx = e[-2:]
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                if sfx in ('.d', '.i'):
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                    yield pe[strip_count:], st.st_size
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    # write file data first
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    for x in walk(os.path.join(root, 'data'), True):
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        yield x
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    # write manifest before changelog
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    meta = list(walk(root, False))
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    meta.sort()
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    meta.reverse()
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    for x in meta:
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        yield x
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# stream file format is simple.
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#
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# server writes out line that says how many files, how many total
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# bytes.  separator is ascii space, byte counts are strings.
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#
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# then for each file:
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#
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#   server writes out line that says file name, how many bytes in
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#   file.  separator is ascii nul, byte count is string.
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#
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#   server writes out raw file data.
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def stream_out(repo, fileobj):
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    '''stream out all metadata files in repository.
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    writes to file-like object, must support write() and optional flush().'''
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    if not repo.ui.configbool('server', 'uncompressed'):
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        fileobj.write('1\n')
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        return
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    # get consistent snapshot of repo. lock during scan so lock not
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    # needed while we stream, and commits can happen.
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    try:
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        repolock = repo.lock()
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    except (lock.LockHeld, lock.LockUnavailable), inst:
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        repo.ui.warn('locking the repository failed: %s\n' % (inst,))
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        fileobj.write('2\n')
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        return
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    fileobj.write('0\n')
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    repo.ui.debug('scanning\n')
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    entries = []
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    total_bytes = 0
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    for name, size in walkrepo(repo.path):
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        entries.append((name, size))
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        total_bytes += size
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    repolock.release()
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    repo.ui.debug('%d files, %d bytes to transfer\n' %
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                  (len(entries), total_bytes))
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    fileobj.write('%d %d\n' % (len(entries), total_bytes))
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    for name, size in entries:
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        repo.ui.debug('sending %s (%d bytes)\n' % (name, size))
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        fileobj.write('%s\0%d\n' % (name, size))
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        for chunk in util.filechunkiter(repo.opener(name), limit=size):
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            fileobj.write(chunk)
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    flush = getattr(fileobj, 'flush', None)
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    if flush: flush()