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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(), "changegroup util os struct")
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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, 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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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 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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if self.version == 0:
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e = (start, size, None, link, p1, p2, node)
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else:
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e = (self.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.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 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):
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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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return revlog.revlog.chunk(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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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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text = revlog.revlog.revision(self, iter_node)
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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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if node != revlog.hash(text, p1, p2):
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raise RevlogError(_("integrity check failed on %s:%d")
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% (self.datafile, self.rev(node)))
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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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class bundlechangelog(bundlerevlog, changelog.changelog):
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def __init__(self, opener, bundlefile):
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changelog.changelog.__init__(self, opener)
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bundlerevlog.__init__(self, opener, "00changelog.i", "00changelog.d",
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bundlefile)
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class bundlemanifest(bundlerevlog, manifest.manifest):
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def __init__(self, opener, bundlefile, linkmapper):
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manifest.manifest.__init__(self, opener)
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bundlerevlog.__init__(self, opener, self.indexfile, self.datafile,
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bundlefile, linkmapper)
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class bundlefilelog(bundlerevlog, filelog.filelog):
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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, self.datafile,
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bundlefile, linkmapper)
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class bundlerepository(localrepo.localrepository):
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def __init__(self, ui, path, bundlename):
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localrepo.localrepository.__init__(self, ui, path)
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f = open(bundlename, "rb")
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s = util.fstat(f)
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self.bundlefile = f
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header = self.bundlefile.read(6)
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if not header.startswith("HG"):
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raise util.Abort(_("%s: not a Mercurial bundle file") % bundlename)
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elif not header.startswith("HG10"):
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raise util.Abort(_("%s: unknown bundle version") % bundlename)
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elif header == "HG10BZ":
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raise util.Abort(_("%s: compressed bundle not supported")
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% bundlename)
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elif header == "HG10UN":
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# uncompressed bundle supported
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pass
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else:
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raise util.Abort(_("%s: unknown bundle compression type")
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% bundlename)
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self.changelog = bundlechangelog(self.opener, self.bundlefile)
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self.manifest = bundlemanifest(self.opener, self.bundlefile,
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self.changelog.rev)
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# dict with the mapping 'filename' -> position in the bundle
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self.bundlefilespos = {}
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while 1:
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f = changegroup.getchunk(self.bundlefile)
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if not f:
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break
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self.bundlefilespos[f] = self.bundlefile.tell()
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for c in changegroup.chunkiter(self.bundlefile):
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pass
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def dev(self):
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return -1
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def file(self, f):
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if f[0] == '/':
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f = f[1:]
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if f in self.bundlefilespos:
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self.bundlefile.seek(self.bundlefilespos[f])
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return bundlefilelog(self.opener, f, self.bundlefile,
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self.changelog.rev)
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else:
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return filelog.filelog(self.opener, 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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