author | Stuart W Marks <smarks@smarks.org> |
Thu, 17 Sep 2009 22:39:38 -0700 | |
changeset 9468 | b2310903c462 |
parent 9437 | 1c4e4004f3a6 |
child 10263 | 25e572394f5c |
permissions | -rw-r--r-- |
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# changegroup.py - Mercurial changegroup manipulation functions |
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# |
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# Copyright 2006 Matt Mackall <mpm@selenic.com> |
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# |
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# This software may be used and distributed according to the terms of the |
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# GNU General Public License version 2, incorporated herein by reference. |
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from i18n import _ |
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import util |
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import struct, os, bz2, zlib, tempfile |
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def getchunk(source): |
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"""return the next chunk from changegroup 'source' as a string""" |
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d = source.read(4) |
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if not d: |
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return "" |
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l = struct.unpack(">l", d)[0] |
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if l <= 4: |
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return "" |
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d = source.read(l - 4) |
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if len(d) < l - 4: |
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raise util.Abort(_("premature EOF reading chunk" |
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" (got %d bytes, expected %d)") |
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% (len(d), l - 4)) |
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return d |
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def chunkiter(source): |
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"""iterate through the chunks in source, yielding a sequence of chunks |
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(strings)""" |
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while 1: |
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c = getchunk(source) |
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if not c: |
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break |
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yield c |
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def chunkheader(length): |
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"""return a changegroup chunk header (string)""" |
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return struct.pack(">l", length + 4) |
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def closechunk(): |
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"""return a changegroup chunk header (string) for a zero-length chunk""" |
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return struct.pack(">l", 0) |
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class nocompress(object): |
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def compress(self, x): |
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return x |
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def flush(self): |
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return "" |
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bundletypes = { |
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"": ("", nocompress), |
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"HG10UN": ("HG10UN", nocompress), |
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"HG10BZ": ("HG10", lambda: bz2.BZ2Compressor()), |
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"HG10GZ": ("HG10GZ", lambda: zlib.compressobj()), |
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} |
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# hgweb uses this list to communicate its preferred type |
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bundlepriority = ['HG10GZ', 'HG10BZ', 'HG10UN'] |
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def writebundle(cg, filename, bundletype): |
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"""Write a bundle file and return its filename. |
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Existing files will not be overwritten. |
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If no filename is specified, a temporary file is created. |
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bz2 compression can be turned off. |
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The bundle file will be deleted in case of errors. |
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""" |
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fh = None |
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cleanup = None |
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try: |
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if filename: |
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fh = open(filename, "wb") |
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else: |
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fd, filename = tempfile.mkstemp(prefix="hg-bundle-", suffix=".hg") |
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fh = os.fdopen(fd, "wb") |
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cleanup = filename |
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header, compressor = bundletypes[bundletype] |
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fh.write(header) |
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z = compressor() |
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# parse the changegroup data, otherwise we will block |
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# in case of sshrepo because we don't know the end of the stream |
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# an empty chunkiter is the end of the changegroup |
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# a changegroup has at least 2 chunkiters (changelog and manifest). |
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# after that, an empty chunkiter is the end of the changegroup |
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empty = False |
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count = 0 |
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while not empty or count <= 2: |
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empty = True |
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count += 1 |
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for chunk in chunkiter(cg): |
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empty = False |
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fh.write(z.compress(chunkheader(len(chunk)))) |
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pos = 0 |
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while pos < len(chunk): |
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next = pos + 2**20 |
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fh.write(z.compress(chunk[pos:next])) |
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pos = next |
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fh.write(z.compress(closechunk())) |
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fh.write(z.flush()) |
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cleanup = None |
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return filename |
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finally: |
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if fh is not None: |
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fh.close() |
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if cleanup is not None: |
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os.unlink(cleanup) |
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def unbundle(header, fh): |
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if header == 'HG10UN': |
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return fh |
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elif not header.startswith('HG'): |
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116 |
# old client with uncompressed bundle |
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117 |
def generator(f): |
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118 |
yield header |
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119 |
for chunk in f: |
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120 |
yield chunk |
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121 |
elif header == 'HG10GZ': |
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parents:
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122 |
def generator(f): |
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123 |
zd = zlib.decompressobj() |
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parents:
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124 |
for chunk in f: |
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125 |
yield zd.decompress(chunk) |
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126 |
elif header == 'HG10BZ': |
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parents:
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127 |
def generator(f): |
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parents:
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128 |
zd = bz2.BZ2Decompressor() |
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129 |
zd.decompress("BZ") |
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130 |
for chunk in util.filechunkiter(f, 4096): |
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131 |
yield zd.decompress(chunk) |
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132 |
return util.chunkbuffer(generator(fh)) |
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133 |
|
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134 |
def readbundle(fh, fname): |
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parents:
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135 |
header = fh.read(6) |
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parents:
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136 |
if not header.startswith('HG'): |
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137 |
raise util.Abort(_('%s: not a Mercurial bundle file') % fname) |
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parents:
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138 |
if not header.startswith('HG10'): |
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139 |
raise util.Abort(_('%s: unknown bundle version') % fname) |
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parents:
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140 |
elif header not in bundletypes: |
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141 |
raise util.Abort(_('%s: unknown bundle compression type') % fname) |
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parents:
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142 |
return unbundle(header, fh) |