mercurial/bundlerepo.py
author Benoit Boissinot <benoit.boissinot@ens-lyon.org>
Tue, 21 Mar 2006 06:03:33 +0100
changeset 1980 dfb796786337
parent 1971 915b81a35e46
child 1981 736b6c96bbbc
permissions -rw-r--r--
use HG10UN header for uncompressed bundle - use HG10UN instead of HG11 for uncompressed bundles header - check HG10BZ for compressed bundle - better error handling for invalid header some notes: - people who created uncompressed bundle will no longer be able to use them (it could be fixed with hand-editing) - older hg cannot detect an uncompressed bundle (bzip2 decompression will fail).
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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 Benoit Boissinot <benoit.boissinot@ens-lyon.org>
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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 gettext as _
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from demandload import demandload
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demandload(globals(), "util os struct")
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import localrepo, changelog, manifest, filelog, revlog
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def getchunk(source):
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    """get a chunk from a group"""
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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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class bundlerevlog(revlog.revlog):
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    def __init__(self, opener, indexfile, datafile, 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, datafile)
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        self.bundlefile = bundlefile
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        def genchunk():
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            while 1:
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                pos = bundlefile.tell()
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                chunk = getchunk(bundlefile)
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                if not chunk:
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                    break
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                yield chunk, pos + 4 # XXX struct.calcsize(">l") == 4
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        n = self.count()
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        prev = None
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        for chunk, start in genchunk():
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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 RevlogError(_("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 = (start, size, None, link, p1, p2, node, prev)
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            self.index.append(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 len(self.index[rev]) > 7
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    def bundlebase(self, rev): return self.index[rev][7]
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    def chunk(self, rev):
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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)
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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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   108
            return revlog.revlog.chunk(self, rev1, rev2)
1942
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diff changeset
   109
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diff changeset
   110
        return self.diff(self.revision(self.node(rev1)),
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diff changeset
   111
                         self.revision(self.node(rev2)))
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diff changeset
   112
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diff changeset
   113
    def revision(self, node):
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diff changeset
   114
        """return an uncompressed revision of a given"""
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diff changeset
   115
        if node == nullid: return ""
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diff changeset
   116
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   117
        text = None
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diff changeset
   118
        chain = []
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   119
        iter_node = node
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   120
        rev = self.rev(iter_node)
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   121
        # reconstruct the revision if it is from a changegroup
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   122
        while self.bundle(rev):
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   123
            if self.cache and self.cache[0] == iter_node:
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   124
                text = self.cache[2]
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   125
                break
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   126
            chain.append(rev)
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   127
            iter_node = self.bundlebase(rev)
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   128
            rev = self.rev(iter_node)
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   129
        if text is None:
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   130
            text = revlog.revlog.revision(self, iter_node)
1942
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   131
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   132
        while chain:
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   133
            delta = self.chunk(chain.pop())
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   134
            text = self.patches(text, [delta])
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   135
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   136
        p1, p2 = self.parents(node)
1946
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   137
        if node != revlog.hash(text, p1, p2):
1942
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diff changeset
   138
            raise RevlogError(_("integrity check failed on %s:%d")
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   139
                          % (self.datafile, self.rev(node)))
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   140
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diff changeset
   141
        self.cache = (node, rev, text)
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   142
        return text
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diff changeset
   143
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diff changeset
   144
    def addrevision(self, text, transaction, link, p1=None, p2=None, d=None):
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   145
        raise NotImplementedError
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   146
    def addgroup(self, revs, linkmapper, transaction, unique=0):
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   147
        raise NotImplementedError
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   148
    def strip(self, rev, minlink):
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diff changeset
   149
        raise NotImplementedError
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   150
    def checksize(self):
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diff changeset
   151
        raise NotImplementedError
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   152
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diff changeset
   153
class bundlechangelog(bundlerevlog, changelog.changelog):
1942
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   154
    def __init__(self, opener, bundlefile):
1946
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diff changeset
   155
        changelog.changelog.__init__(self, opener)
1942
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parents:
diff changeset
   156
        bundlerevlog.__init__(self, opener, "00changelog.i", "00changelog.d",
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diff changeset
   157
                              bundlefile)
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parents:
diff changeset
   158
1946
9fee186f7f0d bundlerepo: remove relative import, fix a comment
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diff changeset
   159
class bundlemanifest(bundlerevlog, manifest.manifest):
1942
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parents:
diff changeset
   160
    def __init__(self, opener, bundlefile, linkmapper):
1946
9fee186f7f0d bundlerepo: remove relative import, fix a comment
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diff changeset
   161
        manifest.manifest.__init__(self, opener)
1942
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parents:
diff changeset
   162
        bundlerevlog.__init__(self, opener, self.indexfile, self.datafile,
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diff changeset
   163
                              bundlefile, linkmapper)
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parents:
diff changeset
   164
1946
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diff changeset
   165
class bundlefilelog(bundlerevlog, filelog.filelog):
1942
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parents:
diff changeset
   166
    def __init__(self, opener, path, bundlefile, linkmapper):
1946
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diff changeset
   167
        filelog.filelog.__init__(self, opener, path)
1942
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diff changeset
   168
        bundlerevlog.__init__(self, opener, self.indexfile, self.datafile,
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   169
                              bundlefile, linkmapper)
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diff changeset
   170
1946
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diff changeset
   171
class bundlerepository(localrepo.localrepository):
1942
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diff changeset
   172
    def __init__(self, ui, path, bundlename):
1946
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diff changeset
   173
        localrepo.localrepository.__init__(self, ui, path)
1942
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diff changeset
   174
        f = open(bundlename, "rb")
9da45de3118d add bundlerepo.py: a read-only repo that can use uncompressed bundles
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parents:
diff changeset
   175
        s = os.fstat(f.fileno())
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diff changeset
   176
        self.bundlefile = f
1980
dfb796786337 use HG10UN header for uncompressed bundle
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diff changeset
   177
        header = self.bundlefile.read(6)
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parents: 1971
diff changeset
   178
        if not header.startswith("HG"):
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diff changeset
   179
            raise util.Abort(_("%s: not a Mercurial bundle file") % bundlename)
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diff changeset
   180
        elif not header.startswith("HG10"):
dfb796786337 use HG10UN header for uncompressed bundle
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diff changeset
   181
            raise util.Abort(_("%s: unknown bundle version") % bundlename)
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diff changeset
   182
        elif header == "HG10BZ":
1942
9da45de3118d add bundlerepo.py: a read-only repo that can use uncompressed bundles
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diff changeset
   183
            raise util.Abort(_("%s: compressed bundle not supported")
9da45de3118d add bundlerepo.py: a read-only repo that can use uncompressed bundles
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diff changeset
   184
                             % bundlename)
1980
dfb796786337 use HG10UN header for uncompressed bundle
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diff changeset
   185
        elif header == "HG10UN":
dfb796786337 use HG10UN header for uncompressed bundle
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diff changeset
   186
            # uncompressed bundle supported
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diff changeset
   187
            pass
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diff changeset
   188
        else:
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diff changeset
   189
            raise util.Abort(_("%s: unknown bundle compression type")
dfb796786337 use HG10UN header for uncompressed bundle
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parents: 1971
diff changeset
   190
                             % bundlename)
1942
9da45de3118d add bundlerepo.py: a read-only repo that can use uncompressed bundles
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parents:
diff changeset
   191
        self.changelog = bundlechangelog(self.opener, self.bundlefile)
9da45de3118d add bundlerepo.py: a read-only repo that can use uncompressed bundles
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parents:
diff changeset
   192
        self.manifest = bundlemanifest(self.opener, self.bundlefile,
9da45de3118d add bundlerepo.py: a read-only repo that can use uncompressed bundles
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parents:
diff changeset
   193
                                       self.changelog.rev)
9da45de3118d add bundlerepo.py: a read-only repo that can use uncompressed bundles
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parents:
diff changeset
   194
        # dict with the mapping 'filename' -> position in the bundle
9da45de3118d add bundlerepo.py: a read-only repo that can use uncompressed bundles
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parents:
diff changeset
   195
        self.bundlefilespos = {}
9da45de3118d add bundlerepo.py: a read-only repo that can use uncompressed bundles
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parents:
diff changeset
   196
        while 1:
9da45de3118d add bundlerepo.py: a read-only repo that can use uncompressed bundles
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parents:
diff changeset
   197
                f = getchunk(self.bundlefile)
9da45de3118d add bundlerepo.py: a read-only repo that can use uncompressed bundles
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parents:
diff changeset
   198
                if not f:
9da45de3118d add bundlerepo.py: a read-only repo that can use uncompressed bundles
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parents:
diff changeset
   199
                    break
9da45de3118d add bundlerepo.py: a read-only repo that can use uncompressed bundles
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parents:
diff changeset
   200
                self.bundlefilespos[f] = self.bundlefile.tell()
9da45de3118d add bundlerepo.py: a read-only repo that can use uncompressed bundles
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parents:
diff changeset
   201
                while getchunk(self.bundlefile):
9da45de3118d add bundlerepo.py: a read-only repo that can use uncompressed bundles
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parents:
diff changeset
   202
                    pass
9da45de3118d add bundlerepo.py: a read-only repo that can use uncompressed bundles
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parents:
diff changeset
   203
9da45de3118d add bundlerepo.py: a read-only repo that can use uncompressed bundles
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parents:
diff changeset
   204
    def dev(self):
9da45de3118d add bundlerepo.py: a read-only repo that can use uncompressed bundles
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parents:
diff changeset
   205
        return -1
9da45de3118d add bundlerepo.py: a read-only repo that can use uncompressed bundles
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parents:
diff changeset
   206
9da45de3118d add bundlerepo.py: a read-only repo that can use uncompressed bundles
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parents:
diff changeset
   207
    def file(self, f):
9da45de3118d add bundlerepo.py: a read-only repo that can use uncompressed bundles
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parents:
diff changeset
   208
        if f[0] == '/':
9da45de3118d add bundlerepo.py: a read-only repo that can use uncompressed bundles
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parents:
diff changeset
   209
            f = f[1:]
9da45de3118d add bundlerepo.py: a read-only repo that can use uncompressed bundles
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parents:
diff changeset
   210
        if f in self.bundlefilespos:
9da45de3118d add bundlerepo.py: a read-only repo that can use uncompressed bundles
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parents:
diff changeset
   211
            self.bundlefile.seek(self.bundlefilespos[f])
9da45de3118d add bundlerepo.py: a read-only repo that can use uncompressed bundles
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents:
diff changeset
   212
            return bundlefilelog(self.opener, f, self.bundlefile,
9da45de3118d add bundlerepo.py: a read-only repo that can use uncompressed bundles
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parents:
diff changeset
   213
                                 self.changelog.rev)
9da45de3118d add bundlerepo.py: a read-only repo that can use uncompressed bundles
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parents:
diff changeset
   214
        else:
1946
9fee186f7f0d bundlerepo: remove relative import, fix a comment
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parents: 1942
diff changeset
   215
            return filelog.filelog(self.opener, f)
1942
9da45de3118d add bundlerepo.py: a read-only repo that can use uncompressed bundles
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents:
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1971
915b81a35e46 imported patch /home/thomas/fix-incoming-abortion4.patch
Thomas Arendsen Hein <thomas@intevation.de>
parents: 1946
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    def close(self):
915b81a35e46 imported patch /home/thomas/fix-incoming-abortion4.patch
Thomas Arendsen Hein <thomas@intevation.de>
parents: 1946
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        """Close assigned bundle file immediately."""
915b81a35e46 imported patch /home/thomas/fix-incoming-abortion4.patch
Thomas Arendsen Hein <thomas@intevation.de>
parents: 1946
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        self.bundlefile.close()