303 lines
11 KiB
Python
303 lines
11 KiB
Python
# bundlerepo.py - repository class for viewing uncompressed bundles
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#
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# Copyright 2006, 2007 Benoit Boissinot <bboissin@gmail.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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"""Repository class for viewing uncompressed bundles.
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This provides a read-only repository interface to bundles as if they
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were part of the actual repository.
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"""
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from node import nullid
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from i18n import _
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import os, struct, bz2, zlib, tempfile, shutil
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import changegroup, util, mdiff
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import localrepo, changelog, manifest, filelog, revlog, error
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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 = len(self)
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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 error.LookupError(p1, self.indexfile,
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_("unknown parent"))
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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, full unc. size, base (unused), link, p1, p2, node
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e = (revlog.offset_type(start, 0), size, -1, -1, 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)
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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 mdiff.textdiff(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 = mdiff.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 error.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):
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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, self.indexfile, 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, bundlefile,
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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, bundlefile,
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linkmapper)
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class bundlerepository(localrepo.localrepository):
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def __init__(self, ui, path, bundlename):
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self._tempparent = None
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try:
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localrepo.localrepository.__init__(self, ui, path)
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except error.RepoError:
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self._tempparent = tempfile.mkdtemp()
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localrepo.instance(ui, self._tempparent, 1)
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localrepo.localrepository.__init__(self, ui, self._tempparent)
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if path:
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self._url = 'bundle:' + path + '+' + bundlename
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else:
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self._url = 'bundle:' + bundlename
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self.tempfile = None
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self.bundlefile = open(bundlename, "rb")
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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") or (header == "HG10GZ"):
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fdtemp, temp = tempfile.mkstemp(prefix="hg-bundle-",
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suffix=".hg10un", dir=self.path)
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self.tempfile = temp
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fptemp = os.fdopen(fdtemp, 'wb')
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def generator(f):
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if header == "HG10BZ":
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zd = bz2.BZ2Decompressor()
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zd.decompress("BZ")
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elif header == "HG10GZ":
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zd = zlib.decompressobj()
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for chunk in f:
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yield zd.decompress(chunk)
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gen = generator(util.filechunkiter(self.bundlefile, 4096))
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try:
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fptemp.write("HG10UN")
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for chunk in gen:
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fptemp.write(chunk)
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finally:
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fptemp.close()
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self.bundlefile.close()
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self.bundlefile = open(self.tempfile, "rb")
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# seek right after the header
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self.bundlefile.seek(6)
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elif header == "HG10UN":
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# nothing to do
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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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# dict with the mapping 'filename' -> position in the bundle
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self.bundlefilespos = {}
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@util.propertycache
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def changelog(self):
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c = bundlechangelog(self.sopener, self.bundlefile)
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self.manstart = self.bundlefile.tell()
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return c
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@util.propertycache
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def manifest(self):
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self.bundlefile.seek(self.manstart)
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m = bundlemanifest(self.sopener, self.bundlefile, self.changelog.rev)
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self.filestart = self.bundlefile.tell()
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return m
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@util.propertycache
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def manstart(self):
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self.changelog
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return self.manstart
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@util.propertycache
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def filestart(self):
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self.manifest
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return self.filestart
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def url(self):
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return self._url
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def file(self, f):
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if not self.bundlefilespos:
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self.bundlefile.seek(self.filestart)
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while 1:
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chunk = changegroup.getchunk(self.bundlefile)
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if not chunk:
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break
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self.bundlefilespos[chunk] = self.bundlefile.tell()
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for c in changegroup.chunkiter(self.bundlefile):
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pass
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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.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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if self._tempparent:
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shutil.rmtree(self._tempparent, True)
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def cancopy(self):
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return False
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def getcwd(self):
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return os.getcwd() # always outside the repo
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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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parentpath = ui.config("bundle", "mainreporoot", "")
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if parentpath:
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# Try to make the full path relative so we get a nice, short URL.
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# In particular, we don't want temp dir names in test outputs.
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cwd = os.getcwd()
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if parentpath == cwd:
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parentpath = ''
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else:
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cwd = os.path.join(cwd,'')
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if parentpath.startswith(cwd):
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parentpath = parentpath[len(cwd):]
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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 = parentpath, 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 = parentpath, path
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return bundlerepository(ui, repopath, bundlename)
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