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# unionrepo.py - repository class for viewing union of repository changesets
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#
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# Derived from bundlerepo.py
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# Copyright 2006, 2007 Benoit Boissinot <bboissin@gmail.com>
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# Copyright 2013 Unity Technologies, Mads Kiilerich <madski@unity3d.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 or any later version.
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"""Repository class for "in-memory pull" of one local repository to another,
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allowing operations like diff and log with revsets.
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"""
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import contextlib
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from .i18n import _
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from . import (
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changelog,
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cmdutil,
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encoding,
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error,
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filelog,
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localrepo,
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manifest,
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mdiff,
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pathutil,
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revlog,
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util,
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vfs as vfsmod,
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)
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from .revlogutils import (
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constants as revlog_constants,
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)
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class unionrevlog(revlog.revlog):
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def __init__(self, opener, radix, revlog2, linkmapper):
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# How it works:
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# To retrieve a revision, we just need to know the node id so we can
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# look it up in revlog2.
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#
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# To differentiate a rev in the second revlog from a rev in the revlog,
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# we check revision against repotiprev.
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opener = vfsmod.readonlyvfs(opener)
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target = getattr(revlog2, 'target', None)
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if target is None:
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# a revlog wrapper, eg: the manifestlog that is not an actual revlog
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target = revlog2._revlog.target
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revlog.revlog.__init__(self, opener, target=target, radix=radix)
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self.revlog2 = revlog2
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n = len(self)
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self.repotiprev = n - 1
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self.bundlerevs = set() # used by 'bundle()' revset expression
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for rev2 in self.revlog2:
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rev = self.revlog2.index[rev2]
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# rev numbers - in revlog2, very different from self.rev
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(
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_start,
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_csize,
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rsize,
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base,
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linkrev,
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p1rev,
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p2rev,
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node,
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_sdo,
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_sds,
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_dcm,
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_sdcm,
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rank,
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) = rev
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flags = _start & 0xFFFF
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if linkmapper is None: # link is to same revlog
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assert linkrev == rev2 # we never link back
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link = n
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else: # rev must be mapped from repo2 cl to unified cl by linkmapper
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link = linkmapper(linkrev)
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if linkmapper is not None: # link is to same revlog
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base = linkmapper(base)
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this_rev = self.index.get_rev(node)
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if this_rev is not None:
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# this happens for the common revlog revisions
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self.bundlerevs.add(this_rev)
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continue
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p1node = self.revlog2.node(p1rev)
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p2node = self.revlog2.node(p2rev)
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# TODO: it's probably wrong to set compressed length to -1, but
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# I have no idea if csize is valid in the base revlog context.
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e = (
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flags,
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-1,
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rsize,
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base,
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link,
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self.rev(p1node),
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self.rev(p2node),
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node,
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0, # sidedata offset
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0, # sidedata size
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revlog_constants.COMP_MODE_INLINE,
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revlog_constants.COMP_MODE_INLINE,
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rank,
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)
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self.index.append(e)
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self.bundlerevs.add(n)
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n += 1
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@contextlib.contextmanager
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def reading(self):
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if 0 <= len(self.bundlerevs) < len(self.index):
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read_1 = super().reading
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else:
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read_1 = util.nullcontextmanager
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if 0 < len(self.bundlerevs):
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read_2 = self.revlog2.reading
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else:
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read_2 = util.nullcontextmanager
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with read_1(), read_2():
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yield
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def _chunk(self, rev):
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if rev <= self.repotiprev:
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return revlog.revlog._chunk(self, rev)
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return self.revlog2._chunk(self.node(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 rev1 > self.repotiprev and rev2 > self.repotiprev:
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return self.revlog2.revdiff(
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self.revlog2.rev(self.node(rev1)),
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self.revlog2.rev(self.node(rev2)),
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)
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elif rev1 <= self.repotiprev and rev2 <= self.repotiprev:
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return super(unionrevlog, self).revdiff(rev1, rev2)
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return mdiff.textdiff(self.rawdata(rev1), self.rawdata(rev2))
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def _revisiondata(self, nodeorrev, raw=False):
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if isinstance(nodeorrev, int):
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rev = nodeorrev
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node = self.node(rev)
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else:
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node = nodeorrev
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rev = self.rev(node)
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if rev > self.repotiprev:
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# work around manifestrevlog NOT being a revlog
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revlog2 = getattr(self.revlog2, '_revlog', self.revlog2)
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func = revlog2._revisiondata
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else:
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func = super(unionrevlog, self)._revisiondata
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return func(node, raw=raw)
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def addrevision(
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self,
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text,
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transaction,
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link,
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p1,
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p2,
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cachedelta=None,
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node=None,
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flags=revlog.REVIDX_DEFAULT_FLAGS,
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deltacomputer=None,
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sidedata=None,
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):
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raise NotImplementedError
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def addgroup(
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self,
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deltas,
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linkmapper,
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transaction,
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alwayscache=False,
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addrevisioncb=None,
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duplicaterevisioncb=None,
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debug_info=None,
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delta_base_reuse_policy=None,
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):
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raise NotImplementedError
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def strip(self, minlink, transaction):
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raise NotImplementedError
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def checksize(self):
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raise NotImplementedError
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class unionchangelog(unionrevlog, changelog.changelog):
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def __init__(self, opener, opener2):
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changelog.changelog.__init__(self, opener)
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linkmapper = None
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changelog2 = changelog.changelog(opener2)
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unionrevlog.__init__(self, opener, self.radix, changelog2, linkmapper)
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class unionmanifest(unionrevlog, manifest.manifestrevlog):
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repotiprev: int
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revlog2: manifest.ManifestRevlog
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def __init__(self, nodeconstants, opener, opener2, linkmapper):
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# XXX manifestrevlog is not actually a revlog , so mixing it with
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# bundlerevlog is not a good idea.
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manifest.manifestrevlog.__init__(self, nodeconstants, opener)
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manifest2 = manifest.manifestrevlog(nodeconstants, opener2)
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unionrevlog.__init__(
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self, opener, self._revlog.radix, manifest2, linkmapper
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)
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class unionfilelog(filelog.filelog):
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_revlog: unionrevlog
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repotiprev: int
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revlog2: revlog.revlog
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def __init__(self, opener, path, opener2, linkmapper, repo):
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filelog.filelog.__init__(self, opener, path)
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filelog2 = filelog.filelog(opener2, path)
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self._revlog = unionrevlog(
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opener, self._revlog.radix, filelog2._revlog, linkmapper
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)
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self._repo = repo
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self.repotiprev = self._revlog.repotiprev
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self.revlog2 = self._revlog.revlog2
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def iscensored(self, rev):
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"""Check if a revision is censored."""
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if rev <= self.repotiprev:
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return filelog.filelog.iscensored(self, rev)
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node = self.node(rev)
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return self.revlog2.iscensored(self.revlog2.rev(node))
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class unionpeer(localrepo.localpeer):
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def canpush(self):
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return False
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class unionrepository:
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"""Represents the union of data in 2 repositories.
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Instances are not usable if constructed directly. Use ``instance()``
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or ``makeunionrepository()`` to create a usable instance.
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"""
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def __init__(self, repo2, url):
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self.repo2 = repo2
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self._url = url
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self.ui.setconfig(b'phases', b'publish', False, b'unionrepo')
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@localrepo.unfilteredpropertycache
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def changelog(self):
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return unionchangelog(self.svfs, self.repo2.svfs)
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@localrepo.unfilteredpropertycache
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def manifestlog(self):
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rootstore = unionmanifest(
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self.nodeconstants,
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self.svfs,
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self.repo2.svfs,
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self.unfiltered()._clrev,
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)
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return manifest.manifestlog(
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self.svfs, self, rootstore, self.narrowmatch()
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)
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def _clrev(self, rev2):
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"""map from repo2 changelog rev to temporary rev in self.changelog"""
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node = self.repo2.changelog.node(rev2)
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return self.changelog.rev(node)
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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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return unionfilelog(
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self.svfs, f, self.repo2.svfs, self.unfiltered()._clrev, self
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)
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def close(self):
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self.repo2.close()
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def cancopy(self):
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return False
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def peer(self, path=None, remotehidden=False):
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return unionpeer(self, path=None, remotehidden=remotehidden)
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def getcwd(self):
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return encoding.getcwd() # always outside the repo
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def instance(ui, path, create, intents=None, createopts=None):
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if create:
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raise error.Abort(_(b'cannot create new union repository'))
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parentpath = ui.config(b"bundle", b"mainreporoot")
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if not parentpath:
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# try to find the correct path to the working directory repo
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parentpath = cmdutil.findrepo(encoding.getcwd())
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if parentpath is None:
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parentpath = b''
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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 = encoding.getcwd()
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if parentpath == cwd:
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parentpath = b''
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else:
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cwd = pathutil.normasprefix(cwd)
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if parentpath.startswith(cwd):
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parentpath = parentpath[len(cwd) :]
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if path.startswith(b'union:'):
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s = path.split(b":", 1)[1].split(b"+", 1)
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if len(s) == 1:
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repopath, repopath2 = parentpath, s[0]
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else:
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repopath, repopath2 = s
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else:
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repopath, repopath2 = parentpath, path
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return makeunionrepository(ui, repopath, repopath2)
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def makeunionrepository(ui, repopath1, repopath2):
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"""Make a union repository object from 2 local repo paths."""
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repo1 = localrepo.instance(ui, repopath1, create=False)
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repo2 = localrepo.instance(ui, repopath2, create=False)
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url = b'union:%s+%s' % (
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util.expandpath(repopath1),
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util.expandpath(repopath2),
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)
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class derivedunionrepository(unionrepository, repo1.__class__):
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pass
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repo = repo1
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repo.__class__ = derivedunionrepository
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unionrepository.__init__(repo1, repo2, url)
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return repo
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