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# remotefilectx.py - filectx/workingfilectx implementations for remotefilelog
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#
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# Copyright 2013 Facebook, Inc.
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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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from __future__ import absolute_import
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import collections
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import time
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from mercurial.node import bin, hex, nullid, nullrev
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from mercurial import (
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ancestor,
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context,
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error,
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phases,
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util,
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)
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from . import shallowutil
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propertycache = util.propertycache
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FASTLOG_TIMEOUT_IN_SECS = 0.5
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class remotefilectx(context.filectx):
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def __init__(self, repo, path, changeid=None, fileid=None,
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filelog=None, changectx=None, ancestormap=None):
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if fileid == nullrev:
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fileid = nullid
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if fileid and len(fileid) == 40:
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fileid = bin(fileid)
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super(remotefilectx, self).__init__(repo, path, changeid,
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fileid, filelog, changectx)
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self._ancestormap = ancestormap
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def size(self):
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return self._filelog.size(self._filenode)
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@propertycache
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def _changeid(self):
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if '_changeid' in self.__dict__:
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return self._changeid
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elif '_changectx' in self.__dict__:
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return self._changectx.rev()
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elif '_descendantrev' in self.__dict__:
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# this file context was created from a revision with a known
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# descendant, we can (lazily) correct for linkrev aliases
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linknode = self._adjustlinknode(self._path, self._filelog,
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self._filenode, self._descendantrev)
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return self._repo.unfiltered().changelog.rev(linknode)
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else:
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return self.linkrev()
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def filectx(self, fileid, changeid=None):
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'''opens an arbitrary revision of the file without
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opening a new filelog'''
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return remotefilectx(self._repo, self._path, fileid=fileid,
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filelog=self._filelog, changeid=changeid)
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def linkrev(self):
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return self._linkrev
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@propertycache
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def _linkrev(self):
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if self._filenode == nullid:
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return nullrev
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ancestormap = self.ancestormap()
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p1, p2, linknode, copyfrom = ancestormap[self._filenode]
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rev = self._repo.changelog.nodemap.get(linknode)
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if rev is not None:
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return rev
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# Search all commits for the appropriate linkrev (slow, but uncommon)
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path = self._path
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fileid = self._filenode
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cl = self._repo.unfiltered().changelog
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mfl = self._repo.manifestlog
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for rev in range(len(cl) - 1, 0, -1):
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node = cl.node(rev)
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data = cl.read(node) # get changeset data (we avoid object creation)
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if path in data[3]: # checking the 'files' field.
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# The file has been touched, check if the hash is what we're
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# looking for.
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if fileid == mfl[data[0]].readfast().get(path):
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return rev
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# Couldn't find the linkrev. This should generally not happen, and will
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# likely cause a crash.
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return None
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def introrev(self):
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"""return the rev of the changeset which introduced this file revision
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This method is different from linkrev because it take into account the
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changeset the filectx was created from. It ensures the returned
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revision is one of its ancestors. This prevents bugs from
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'linkrev-shadowing' when a file revision is used by multiple
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changesets.
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"""
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lkr = self.linkrev()
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attrs = vars(self)
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noctx = not ('_changeid' in attrs or '_changectx' in attrs)
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if noctx or self.rev() == lkr:
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return lkr
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linknode = self._adjustlinknode(self._path, self._filelog,
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self._filenode, self.rev(),
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inclusive=True)
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return self._repo.changelog.rev(linknode)
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def renamed(self):
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"""check if file was actually renamed in this changeset revision
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If rename logged in file revision, we report copy for changeset only
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if file revisions linkrev points back to the changeset in question
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or both changeset parents contain different file revisions.
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"""
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ancestormap = self.ancestormap()
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p1, p2, linknode, copyfrom = ancestormap[self._filenode]
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if not copyfrom:
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return None
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renamed = (copyfrom, p1)
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if self.rev() == self.linkrev():
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return renamed
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name = self.path()
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fnode = self._filenode
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for p in self._changectx.parents():
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try:
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if fnode == p.filenode(name):
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return None
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except error.LookupError:
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pass
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return renamed
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def ancestormap(self):
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if not self._ancestormap:
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self._ancestormap = self.filelog().ancestormap(self._filenode)
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return self._ancestormap
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def parents(self):
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repo = self._repo
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ancestormap = self.ancestormap()
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p1, p2, linknode, copyfrom = ancestormap[self._filenode]
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results = []
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if p1 != nullid:
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path = copyfrom or self._path
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flog = repo.file(path)
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p1ctx = remotefilectx(repo, path, fileid=p1, filelog=flog,
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ancestormap=ancestormap)
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p1ctx._descendantrev = self.rev()
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results.append(p1ctx)
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if p2 != nullid:
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path = self._path
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flog = repo.file(path)
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p2ctx = remotefilectx(repo, path, fileid=p2, filelog=flog,
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ancestormap=ancestormap)
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p2ctx._descendantrev = self.rev()
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results.append(p2ctx)
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return results
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def _nodefromancrev(self, ancrev, cl, mfl, path, fnode):
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"""returns the node for <path> in <ancrev> if content matches <fnode>"""
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ancctx = cl.read(ancrev) # This avoids object creation.
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manifestnode, files = ancctx[0], ancctx[3]
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# If the file was touched in this ancestor, and the content is similar
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# to the one we are searching for.
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if path in files and fnode == mfl[manifestnode].readfast().get(path):
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return cl.node(ancrev)
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return None
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def _adjustlinknode(self, path, filelog, fnode, srcrev, inclusive=False):
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"""return the first ancestor of <srcrev> introducing <fnode>
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If the linkrev of the file revision does not point to an ancestor of
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srcrev, we'll walk down the ancestors until we find one introducing
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this file revision.
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:repo: a localrepository object (used to access changelog and manifest)
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:path: the file path
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:fnode: the nodeid of the file revision
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:filelog: the filelog of this path
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:srcrev: the changeset revision we search ancestors from
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:inclusive: if true, the src revision will also be checked
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Note: This is based on adjustlinkrev in core, but it's quite different.
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adjustlinkrev depends on the fact that the linkrev is the bottom most
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node, and uses that as a stopping point for the ancestor traversal. We
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can't do that here because the linknode is not guaranteed to be the
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bottom most one.
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In our code here, we actually know what a bunch of potential ancestor
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linknodes are, so instead of stopping the cheap-ancestor-traversal when
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we get to a linkrev, we stop when we see any of the known linknodes.
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"""
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repo = self._repo
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cl = repo.unfiltered().changelog
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mfl = repo.manifestlog
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ancestormap = self.ancestormap()
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linknode = ancestormap[fnode][2]
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if srcrev is None:
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# wctx case, used by workingfilectx during mergecopy
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revs = [p.rev() for p in self._repo[None].parents()]
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inclusive = True # we skipped the real (revless) source
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else:
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revs = [srcrev]
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if self._verifylinknode(revs, linknode):
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return linknode
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commonlogkwargs = {
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'revs': ' '.join([hex(cl.node(rev)) for rev in revs]),
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'fnode': hex(fnode),
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'filepath': path,
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'user': shallowutil.getusername(repo.ui),
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'reponame': shallowutil.getreponame(repo.ui),
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}
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repo.ui.log('linkrevfixup', 'adjusting linknode', **commonlogkwargs)
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pc = repo._phasecache
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seenpublic = False
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iteranc = cl.ancestors(revs, inclusive=inclusive)
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for ancrev in iteranc:
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# First, check locally-available history.
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lnode = self._nodefromancrev(ancrev, cl, mfl, path, fnode)
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if lnode is not None:
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return lnode
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# adjusting linknode can be super-slow. To mitigate the issue
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# we use two heuristics: calling fastlog and forcing remotefilelog
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# prefetch
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if not seenpublic and pc.phase(repo, ancrev) == phases.public:
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# TODO: there used to be a codepath to fetch linknodes
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# from a server as a fast path, but it appeared to
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# depend on an API FB added to their phabricator.
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lnode = self._forceprefetch(repo, path, fnode, revs,
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commonlogkwargs)
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if lnode:
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return lnode
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seenpublic = True
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return linknode
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def _forceprefetch(self, repo, path, fnode, revs,
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commonlogkwargs):
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# This next part is super non-obvious, so big comment block time!
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#
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# It is possible to get extremely bad performance here when a fairly
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# common set of circumstances occur when this extension is combined
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# with a server-side commit rewriting extension like pushrebase.
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#
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# First, an engineer creates Commit A and pushes it to the server.
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# While the server's data structure will have the correct linkrev
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# for the files touched in Commit A, the client will have the
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# linkrev of the local commit, which is "invalid" because it's not
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# an ancestor of the main line of development.
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#
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# The client will never download the remotefilelog with the correct
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# linkrev as long as nobody else touches that file, since the file
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# data and history hasn't changed since Commit A.
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#
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# After a long time (or a short time in a heavily used repo), if the
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# same engineer returns to change the same file, some commands --
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# such as amends of commits with file moves, logs, diffs, etc --
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# can trigger this _adjustlinknode code. In those cases, finding
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# the correct rev can become quite expensive, as the correct
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# revision is far back in history and we need to walk back through
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# history to find it.
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#
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# In order to improve this situation, we force a prefetch of the
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# remotefilelog data blob for the file we were called on. We do this
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# at most once, when we first see a public commit in the history we
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# are traversing.
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#
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# Forcing the prefetch means we will download the remote blob even
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# if we have the "correct" blob in the local store. Since the union
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# store checks the remote store first, this means we are much more
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# likely to get the correct linkrev at this point.
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#
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# In rare circumstances (such as the server having a suboptimal
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# linkrev for our use case), we will fall back to the old slow path.
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#
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# We may want to add additional heuristics here in the future if
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# the slow path is used too much. One promising possibility is using
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# obsolescence markers to find a more-likely-correct linkrev.
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logmsg = ''
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start = time.time()
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try:
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repo.fileservice.prefetch([(path, hex(fnode))], force=True)
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# Now that we've downloaded a new blob from the server,
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# we need to rebuild the ancestor map to recompute the
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# linknodes.
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self._ancestormap = None
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linknode = self.ancestormap()[fnode][2] # 2 is linknode
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if self._verifylinknode(revs, linknode):
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logmsg = 'remotefilelog prefetching succeeded'
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return linknode
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logmsg = 'remotefilelog prefetching not found'
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return None
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except Exception as e:
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logmsg = 'remotefilelog prefetching failed (%s)' % e
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return None
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finally:
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elapsed = time.time() - start
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repo.ui.log('linkrevfixup', logmsg, elapsed=elapsed * 1000,
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**commonlogkwargs)
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def _verifylinknode(self, revs, linknode):
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"""
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Check if a linknode is correct one for the current history.
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That is, return True if the linkrev is the ancestor of any of the
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passed in revs, otherwise return False.
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`revs` is a list that usually has one element -- usually the wdir parent
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or the user-passed rev we're looking back from. It may contain two revs
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when there is a merge going on, or zero revs when a root node with no
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parents is being created.
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"""
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if not revs:
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return False
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try:
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# Use the C fastpath to check if the given linknode is correct.
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cl = self._repo.unfiltered().changelog
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return any(cl.isancestor(linknode, cl.node(r)) for r in revs)
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except error.LookupError:
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# The linknode read from the blob may have been stripped or
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# otherwise not present in the repository anymore. Do not fail hard
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# in this case. Instead, return false and continue the search for
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# the correct linknode.
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return False
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def ancestors(self, followfirst=False):
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ancestors = []
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queue = collections.deque((self,))
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seen = set()
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while queue:
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current = queue.pop()
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if current.filenode() in seen:
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continue
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seen.add(current.filenode())
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ancestors.append(current)
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parents = current.parents()
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first = True
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for p in parents:
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if first or not followfirst:
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queue.append(p)
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first = False
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# Remove self
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ancestors.pop(0)
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# Sort by linkrev
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# The copy tracing algorithm depends on these coming out in order
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ancestors = sorted(ancestors, reverse=True, key=lambda x:x.linkrev())
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for ancestor in ancestors:
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yield ancestor
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def ancestor(self, fc2, actx):
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# the easy case: no (relevant) renames
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if fc2.path() == self.path() and self.path() in actx:
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return actx[self.path()]
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# the next easiest cases: unambiguous predecessor (name trumps
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# history)
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if self.path() in actx and fc2.path() not in actx:
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return actx[self.path()]
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if fc2.path() in actx and self.path() not in actx:
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return actx[fc2.path()]
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# do a full traversal
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amap = self.ancestormap()
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bmap = fc2.ancestormap()
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def parents(x):
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f, n = x
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p = amap.get(n) or bmap.get(n)
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if not p:
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return []
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return [(p[3] or f, p[0]), (f, p[1])]
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a = (self.path(), self.filenode())
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b = (fc2.path(), fc2.filenode())
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result = ancestor.genericancestor(a, b, parents)
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if result:
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f, n = result
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r = remotefilectx(self._repo, f, fileid=n,
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ancestormap=amap)
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return r
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return None
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def annotate(self, *args, **kwargs):
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introctx = self
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prefetchskip = kwargs.pop('prefetchskip', None)
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if prefetchskip:
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# use introrev so prefetchskip can be accurately tested
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introrev = self.introrev()
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if self.rev() != introrev:
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introctx = remotefilectx(self._repo, self._path,
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changeid=introrev,
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fileid=self._filenode,
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filelog=self._filelog,
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ancestormap=self._ancestormap)
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# like self.ancestors, but append to "fetch" and skip visiting parents
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# of nodes in "prefetchskip".
|
|
|
fetch = []
|
|
|
seen = set()
|
|
|
queue = collections.deque((introctx,))
|
|
|
seen.add(introctx.node())
|
|
|
while queue:
|
|
|
current = queue.pop()
|
|
|
if current.filenode() != self.filenode():
|
|
|
# this is a "joint point". fastannotate needs contents of
|
|
|
# "joint point"s to calculate diffs for side branches.
|
|
|
fetch.append((current.path(), hex(current.filenode())))
|
|
|
if prefetchskip and current in prefetchskip:
|
|
|
continue
|
|
|
for parent in current.parents():
|
|
|
if parent.node() not in seen:
|
|
|
seen.add(parent.node())
|
|
|
queue.append(parent)
|
|
|
|
|
|
self._repo.ui.debug('remotefilelog: prefetching %d files '
|
|
|
'for annotate\n' % len(fetch))
|
|
|
if fetch:
|
|
|
self._repo.fileservice.prefetch(fetch)
|
|
|
return super(remotefilectx, self).annotate(*args, **kwargs)
|
|
|
|
|
|
# Return empty set so that the hg serve and thg don't stack trace
|
|
|
def children(self):
|
|
|
return []
|
|
|
|
|
|
class remoteworkingfilectx(context.workingfilectx, remotefilectx):
|
|
|
def __init__(self, repo, path, filelog=None, workingctx=None):
|
|
|
self._ancestormap = None
|
|
|
return super(remoteworkingfilectx, self).__init__(repo, path,
|
|
|
filelog, workingctx)
|
|
|
|
|
|
def parents(self):
|
|
|
return remotefilectx.parents(self)
|
|
|
|
|
|
def ancestormap(self):
|
|
|
if not self._ancestormap:
|
|
|
path = self._path
|
|
|
pcl = self._changectx._parents
|
|
|
renamed = self.renamed()
|
|
|
|
|
|
if renamed:
|
|
|
p1 = renamed
|
|
|
else:
|
|
|
p1 = (path, pcl[0]._manifest.get(path, nullid))
|
|
|
|
|
|
p2 = (path, nullid)
|
|
|
if len(pcl) > 1:
|
|
|
p2 = (path, pcl[1]._manifest.get(path, nullid))
|
|
|
|
|
|
m = {}
|
|
|
if p1[1] != nullid:
|
|
|
p1ctx = self._repo.filectx(p1[0], fileid=p1[1])
|
|
|
m.update(p1ctx.filelog().ancestormap(p1[1]))
|
|
|
|
|
|
if p2[1] != nullid:
|
|
|
p2ctx = self._repo.filectx(p2[0], fileid=p2[1])
|
|
|
m.update(p2ctx.filelog().ancestormap(p2[1]))
|
|
|
|
|
|
copyfrom = ''
|
|
|
if renamed:
|
|
|
copyfrom = renamed[0]
|
|
|
m[None] = (p1[1], p2[1], nullid, copyfrom)
|
|
|
self._ancestormap = m
|
|
|
|
|
|
return self._ancestormap
|
|
|
|
