mercurial/bundlerepo.py
author Matt Mackall <mpm@selenic.com>
Mon, 23 Jul 2007 20:44:08 -0500
changeset 4979 06abdaf78788
parent 4918 e017d3a82e1d
child 4984 b4066fcbd6ba
permissions -rw-r--r--
revlog: add a magic null revision to our index We expand our index by one entry so that index[nullrev] points to a unique entry, the null revision. This naturally eliminates numerous extra tests in the performance-sensitive index access functions, most of which are now trivial again. Adding new entries is now done with insert(-1, e) rather than append(e).
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"""
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bundlerepo.py - repository class for viewing uncompressed bundles
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This provides a read-only repository interface to bundles as if
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they were part of the actual repository.
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Copyright 2006, 2007 Benoit Boissinot <bboissin@gmail.com>
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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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"""
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from node import *
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from i18n import _
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import changegroup, util, os, struct, bz2, tempfile
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import localrepo, changelog, manifest, filelog, revlog
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class bundlerevlog(revlog.revlog):
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    def __init__(self, opener, indexfile, bundlefile,
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                 linkmapper=None):
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        # How it works:
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        # to retrieve a revision, we need to know the offset of
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        # the revision in the bundlefile (an opened file).
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        #
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        # We store this offset in the index (start), to differentiate a
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        # rev in the bundle and from a rev in the revlog, we check
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        # len(index[r]). If the tuple is bigger than 7, it is a bundle
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        # (it is bigger since we store the node to which the delta is)
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        #
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        revlog.revlog.__init__(self, opener, indexfile)
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        self.bundlefile = bundlefile
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        self.basemap = {}
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        def chunkpositer():
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            for chunk in changegroup.chunkiter(bundlefile):
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                pos = bundlefile.tell()
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                yield chunk, pos - len(chunk)
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        n = self.count()
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        prev = None
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        for chunk, start in chunkpositer():
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            size = len(chunk)
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            if size < 80:
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                raise util.Abort("invalid changegroup")
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            start += 80
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            size -= 80
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            node, p1, p2, cs = struct.unpack("20s20s20s20s", chunk[:80])
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            if node in self.nodemap:
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                prev = node
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                continue
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            for p in (p1, p2):
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                if not p in self.nodemap:
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                    raise revlog.LookupError(_("unknown parent %s") % short(p1))
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            if linkmapper is None:
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                link = n
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            else:
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                link = linkmapper(cs)
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            if not prev:
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                prev = p1
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            # start, size, base is not used, link, p1, p2, delta ref
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            e = (revlog.offset_type(start, 0), size, -1, None, link,
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                 self.rev(p1), self.rev(p2), node)
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            self.basemap[n] = prev
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            self.index.insert(-1, e)
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            self.nodemap[node] = n
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            prev = node
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            n += 1
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    def bundle(self, rev):
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        """is rev from the bundle"""
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        if rev < 0:
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            return False
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        return rev in self.basemap
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    def bundlebase(self, rev): return self.basemap[rev]
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    def chunk(self, rev, df=None, cachelen=4096):
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        # Warning: in case of bundle, the diff is against bundlebase,
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        # not against rev - 1
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        # XXX: could use some caching
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        if not self.bundle(rev):
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            return revlog.revlog.chunk(self, rev, df, cachelen)
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        self.bundlefile.seek(self.start(rev))
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        return self.bundlefile.read(self.length(rev))
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    def revdiff(self, rev1, rev2):
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        """return or calculate a delta between two revisions"""
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        if self.bundle(rev1) and self.bundle(rev2):
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            # hot path for bundle
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            revb = self.rev(self.bundlebase(rev2))
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            if revb == rev1:
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                return self.chunk(rev2)
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        elif not self.bundle(rev1) and not self.bundle(rev2):
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            return revlog.revlog.revdiff(self, rev1, rev2)
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        return self.diff(self.revision(self.node(rev1)),
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                         self.revision(self.node(rev2)))
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    def revision(self, node):
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        """return an uncompressed revision of a given"""
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        if node == nullid: return ""
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        text = None
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        chain = []
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        iter_node = node
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        rev = self.rev(iter_node)
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        # reconstruct the revision if it is from a changegroup
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        while self.bundle(rev):
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            if self.cache and self.cache[0] == iter_node:
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                text = self.cache[2]
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                break
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            chain.append(rev)
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   111
            iter_node = self.bundlebase(rev)
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            rev = self.rev(iter_node)
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        if text is None:
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   114
            text = revlog.revlog.revision(self, iter_node)
1942
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   115
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   116
        while chain:
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            delta = self.chunk(chain.pop())
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            text = self.patches(text, [delta])
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        p1, p2 = self.parents(node)
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   121
        if node != revlog.hash(text, p1, p2):
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            raise revlog.RevlogError(_("integrity check failed on %s:%d")
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   123
                                     % (self.datafile, self.rev(node)))
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   124
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   125
        self.cache = (node, self.rev(node), text)
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        return text
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    def addrevision(self, text, transaction, link, p1=None, p2=None, d=None):
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        raise NotImplementedError
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    def addgroup(self, revs, linkmapper, transaction, unique=0):
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        raise NotImplementedError
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    def strip(self, rev, minlink):
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        raise NotImplementedError
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    def checksize(self):
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        raise NotImplementedError
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   136
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class bundlechangelog(bundlerevlog, changelog.changelog):
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    def __init__(self, opener, bundlefile):
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   139
        changelog.changelog.__init__(self, opener)
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        bundlerevlog.__init__(self, opener, self.indexfile, bundlefile)
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   141
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class bundlemanifest(bundlerevlog, manifest.manifest):
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   143
    def __init__(self, opener, bundlefile, linkmapper):
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        manifest.manifest.__init__(self, opener)
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   145
        bundlerevlog.__init__(self, opener, self.indexfile, bundlefile,
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   146
                              linkmapper)
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   147
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class bundlefilelog(bundlerevlog, filelog.filelog):
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   149
    def __init__(self, opener, path, bundlefile, linkmapper):
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        filelog.filelog.__init__(self, opener, path)
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        bundlerevlog.__init__(self, opener, self.indexfile, bundlefile,
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   152
                              linkmapper)
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   153
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class bundlerepository(localrepo.localrepository):
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   155
    def __init__(self, ui, path, bundlename):
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   156
        localrepo.localrepository.__init__(self, ui, path)
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   157
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   158
        self._url = 'bundle:' + bundlename
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   159
        if path: self._url += '+' + path
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   160
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   161
        self.tempfile = None
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   162
        self.bundlefile = open(bundlename, "rb")
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   163
        header = self.bundlefile.read(6)
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diff changeset
   164
        if not header.startswith("HG"):
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   165
            raise util.Abort(_("%s: not a Mercurial bundle file") % bundlename)
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diff changeset
   166
        elif not header.startswith("HG10"):
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   167
            raise util.Abort(_("%s: unknown bundle version") % bundlename)
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   168
        elif header == "HG10BZ":
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   169
            fdtemp, temp = tempfile.mkstemp(prefix="hg-bundle-",
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   170
                                            suffix=".hg10un", dir=self.path)
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   171
            self.tempfile = temp
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   172
            fptemp = os.fdopen(fdtemp, 'wb')
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   173
            def generator(f):
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   174
                zd = bz2.BZ2Decompressor()
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   175
                zd.decompress("BZ")
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   176
                for chunk in f:
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   177
                    yield zd.decompress(chunk)
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   178
            gen = generator(util.filechunkiter(self.bundlefile, 4096))
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   179
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   180
            try:
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   181
                fptemp.write("HG10UN")
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   182
                for chunk in gen:
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   183
                    fptemp.write(chunk)
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diff changeset
   184
            finally:
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   185
                fptemp.close()
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diff changeset
   186
                self.bundlefile.close()
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diff changeset
   187
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diff changeset
   188
            self.bundlefile = open(self.tempfile, "rb")
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diff changeset
   189
            # seek right after the header
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diff changeset
   190
            self.bundlefile.seek(6)
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diff changeset
   191
        elif header == "HG10UN":
2273
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diff changeset
   192
            # nothing to do
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diff changeset
   193
            pass
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diff changeset
   194
        else:
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diff changeset
   195
            raise util.Abort(_("%s: unknown bundle compression type")
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diff changeset
   196
                             % bundlename)
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diff changeset
   197
        self.changelog = bundlechangelog(self.sopener, self.bundlefile)
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   198
        self.manifest = bundlemanifest(self.sopener, self.bundlefile,
1942
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diff changeset
   199
                                       self.changelog.rev)
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   200
        # dict with the mapping 'filename' -> position in the bundle
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diff changeset
   201
        self.bundlefilespos = {}
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diff changeset
   202
        while 1:
1981
736b6c96bbbc make incoming work via ssh (issue139); move chunk code into separate module.
Thomas Arendsen Hein <thomas@intevation.de>
parents: 1980
diff changeset
   203
            f = changegroup.getchunk(self.bundlefile)
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diff changeset
   204
            if not f:
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   205
                break
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diff changeset
   206
            self.bundlefilespos[f] = self.bundlefile.tell()
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diff changeset
   207
            for c in changegroup.chunkiter(self.bundlefile):
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diff changeset
   208
                pass
1942
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diff changeset
   209
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   210
    def url(self):
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   211
        return self._url
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diff changeset
   212
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diff changeset
   213
    def dev(self):
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   214
        return -1
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diff changeset
   215
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diff changeset
   216
    def file(self, f):
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diff changeset
   217
        if f[0] == '/':
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diff changeset
   218
            f = f[1:]
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diff changeset
   219
        if f in self.bundlefilespos:
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diff changeset
   220
            self.bundlefile.seek(self.bundlefilespos[f])
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parents: 3787
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            return bundlefilelog(self.sopener, f, self.bundlefile,
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                                 self.changelog.rev)
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        else:
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            return filelog.filelog(self.sopener, f)
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    def close(self):
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        """Close assigned bundle file immediately."""
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        self.bundlefile.close()
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    def __del__(self):
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        bundlefile = getattr(self, 'bundlefile', None)
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        if bundlefile and not bundlefile.closed:
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            bundlefile.close()
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        tempfile = getattr(self, 'tempfile', None)
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        if tempfile is not None:
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            os.unlink(tempfile)
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def instance(ui, path, create):
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    if create:
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        raise util.Abort(_('cannot create new bundle repository'))
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    path = util.drop_scheme('file', path)
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    if path.startswith('bundle:'):
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        path = util.drop_scheme('bundle', path)
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        s = path.split("+", 1)
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        if len(s) == 1:
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            repopath, bundlename = "", s[0]
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        else:
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            repopath, bundlename = s
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    else:
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        repopath, bundlename = '', path
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    return bundlerepository(ui, repopath, bundlename)