--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/mercurial/bundlerepo.py Mon Mar 13 03:54:23 2006 +0100
@@ -0,0 +1,213 @@
+"""
+bundlerepo.py - repository class for viewing uncompressed bundles
+
+This provides a read-only repository interface to bundles as if
+they were part of the actual repository.
+
+Copyright 2006 Benoit Boissinot <benoit.boissinot@ens-lyon.org>
+
+This software may be used and distributed according to the terms
+of the GNU General Public License, incorporated herein by reference.
+"""
+
+from node import *
+from i18n import gettext as _
+from demandload import demandload
+demandload(globals(), "util os struct")
+
+from changelog import changelog
+from manifest import manifest
+from filelog import filelog
+from localrepo import localrepository
+from revlog import *
+
+def getchunk(source):
+ """get a chunk from a group"""
+ d = source.read(4)
+ if not d:
+ return ""
+ l = struct.unpack(">l", d)[0]
+ if l <= 4:
+ return ""
+ d = source.read(l - 4)
+ if len(d) < l - 4:
+ raise util.Abort(_("premature EOF reading chunk"
+ " (got %d bytes, expected %d)")
+ % (len(d), l - 4))
+ return d
+
+class bundlerevlog(revlog):
+ def __init__(self, opener, indexfile, datafile, bundlefile,
+ linkmapper=None):
+ # How it works:
+ # to retrieve a revision, we need to know the offset of
+ # the revision in the bundlefile (an opened file).
+ #
+ # We store this offset in the index (start), to differentiate a
+ # rev in the bundle and from a rev in the revlog, we check
+ # len(index[r]). If the tuple is bigger than 7, it is a bundle
+ # (it is bigger since we store the node to which the delta is)
+ #
+ revlog.__init__(self, opener, indexfile, datafile)
+ self.bundlefile = bundlefile
+ def genchunk():
+ while 1:
+ pos = bundlefile.tell()
+ chunk = getchunk(bundlefile)
+ if not chunk:
+ break
+ yield chunk, pos + 4 # XXX struct.calcsize(">l") == 4
+ n = self.count()
+ prev = None
+ for chunk, start in genchunk():
+ size = len(chunk)
+ if size < 80:
+ raise util.Abort("invalid changegroup")
+ start += 80
+ size -= 80
+ node, p1, p2, cs = struct.unpack("20s20s20s20s", chunk[:80])
+ if node in self.nodemap:
+ prev = node
+ continue
+ for p in (p1, p2):
+ if not p in self.nodemap:
+ raise RevlogError(_("unknown parent %s") % short(p1))
+ if linkmapper is None:
+ link = n
+ else:
+ link = linkmapper(cs)
+
+ if not prev:
+ prev = p1
+ # start, size, base is not used, link, p1, p2, delta ref
+ # warning:
+ e = (start, size, None, link, p1, p2, node, prev)
+ self.index.append(e)
+ self.nodemap[node] = n
+ prev = node
+ n += 1
+
+ def bundle(self, rev):
+ """is rev from the bundle"""
+ if rev < 0:
+ return False
+ return len(self.index[rev]) > 7
+ def bundlebase(self, rev): return self.index[rev][7]
+ def chunk(self, rev):
+ # Warning: in case of bundle, the diff is against bundlebase,
+ # not against rev - 1
+ # XXX: could use some caching
+ if not self.bundle(rev):
+ return revlog.chunk(self, rev)
+ self.bundlefile.seek(self.start(rev))
+ return self.bundlefile.read(self.length(rev))
+
+ def revdiff(self, rev1, rev2):
+ """return or calculate a delta between two revisions"""
+ if self.bundle(rev1) and self.bundle(rev2):
+ # hot path for bundle
+ revb = self.rev(self.bundlebase(rev2))
+ if revb == rev1:
+ return self.chunk(rev2)
+ elif not self.bundle(rev1) and not self.bundle(rev2):
+ return revlog.chunk(self, rev1, rev2)
+
+ return self.diff(self.revision(self.node(rev1)),
+ self.revision(self.node(rev2)))
+
+ def revision(self, node):
+ """return an uncompressed revision of a given"""
+ if node == nullid: return ""
+
+ text = None
+ chain = []
+ iter_node = node
+ rev = self.rev(iter_node)
+ # reconstruct the revision if it is from a changegroup
+ while self.bundle(rev):
+ if self.cache and self.cache[0] == iter_node:
+ text = self.cache[2]
+ break
+ chain.append(rev)
+ iter_node = self.bundlebase(rev)
+ rev = self.rev(iter_node)
+ if text is None:
+ text = revlog.revision(self, iter_node)
+
+ while chain:
+ delta = self.chunk(chain.pop())
+ text = self.patches(text, [delta])
+
+ p1, p2 = self.parents(node)
+ if node != hash(text, p1, p2):
+ raise RevlogError(_("integrity check failed on %s:%d")
+ % (self.datafile, self.rev(node)))
+
+ self.cache = (node, rev, text)
+ return text
+
+ def addrevision(self, text, transaction, link, p1=None, p2=None, d=None):
+ raise NotImplementedError
+ def addgroup(self, revs, linkmapper, transaction, unique=0):
+ raise NotImplementedError
+ def strip(self, rev, minlink):
+ raise NotImplementedError
+ def checksize(self):
+ raise NotImplementedError
+
+class bundlechangelog(bundlerevlog, changelog):
+ def __init__(self, opener, bundlefile):
+ changelog.__init__(self, opener)
+ bundlerevlog.__init__(self, opener, "00changelog.i", "00changelog.d",
+ bundlefile)
+
+class bundlemanifest(bundlerevlog, manifest):
+ def __init__(self, opener, bundlefile, linkmapper):
+ manifest.__init__(self, opener)
+ bundlerevlog.__init__(self, opener, self.indexfile, self.datafile,
+ bundlefile, linkmapper)
+
+class bundlefilelog(bundlerevlog, filelog):
+ def __init__(self, opener, path, bundlefile, linkmapper):
+ filelog.__init__(self, opener, path)
+ bundlerevlog.__init__(self, opener, self.indexfile, self.datafile,
+ bundlefile, linkmapper)
+
+class bundlerepository(localrepository):
+ def __init__(self, ui, path, bundlename):
+ localrepository.__init__(self, ui, path)
+ f = open(bundlename, "rb")
+ s = os.fstat(f.fileno())
+ self.bundlefile = f
+ header = self.bundlefile.read(4)
+ if header == "HG10":
+ raise util.Abort(_("%s: compressed bundle not supported")
+ % bundlename)
+ elif header != "HG11":
+ raise util.Abort(_("%s: not a Mercurial bundle file") % bundlename)
+ self.changelog = bundlechangelog(self.opener, self.bundlefile)
+ self.manifest = bundlemanifest(self.opener, self.bundlefile,
+ self.changelog.rev)
+ # dict with the mapping 'filename' -> position in the bundle
+ self.bundlefilespos = {}
+ while 1:
+ f = getchunk(self.bundlefile)
+ if not f:
+ break
+ self.bundlefilespos[f] = self.bundlefile.tell()
+ while getchunk(self.bundlefile):
+ pass
+
+ def dev(self):
+ return -1
+
+ def file(self, f):
+ if f[0] == '/':
+ f = f[1:]
+ if f in self.bundlefilespos:
+ self.bundlefile.seek(self.bundlefilespos[f])
+ return bundlefilelog(self.opener, f, self.bundlefile,
+ self.changelog.rev)
+ else:
+ return filelog(self.opener, f)
+