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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 i18n import gettext as _
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import 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.spath):
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name = util.pconvert(repo.decodefn(name))
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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.sopener(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()
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