Mercurial > hg
comparison mercurial/localrepo.py @ 39765:3e801ffd7269
filelog: custom filelog to be used with narrow repos
Narrow repos may have file revisions whose copy/rename metadata
references files not in the store. This can pose problems when
consumers attempt to access a missing referenced file revision.
The narrow extension hacks around this problem by implementing a
derived filelog type that provides custom implementations of
renamed(), size(), and cmp() which handle renames against files not
in the narrow spec by silently removing the rename metadata.
While silently dropping metadata isn't the most robust solution,
it is the easiest to implement.
This commit ports the custom narrow filelog class to core.
When a narrow repo is constructed, its ifilestorage creation
function will automatically use the new filelog type. This means
the extra logic is 0 cost for non-narrow repos and shouldn't
interfere with their operation.
Differential Revision: https://phab.mercurial-scm.org/D4643
author | Gregory Szorc <gregory.szorc@gmail.com> |
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date | Thu, 13 Sep 2018 16:02:22 -0700 |
parents | e4e881572382 |
children | 7aa440222323 |
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39764:e4e881572382 | 39765:3e801ffd7269 |
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741 if path[0] == b'/': | 741 if path[0] == b'/': |
742 path = path[1:] | 742 path = path[1:] |
743 | 743 |
744 return filelog.filelog(self.svfs, path) | 744 return filelog.filelog(self.svfs, path) |
745 | 745 |
746 @interfaceutil.implementer(repository.ilocalrepositoryfilestorage) | |
747 class revlognarrowfilestorage(object): | |
748 """File storage when using revlogs and narrow files.""" | |
749 | |
750 def file(self, path): | |
751 if path[0] == b'/': | |
752 path = path[1:] | |
753 | |
754 return filelog.narrowfilelog(self.svfs, path, self.narrowmatch()) | |
755 | |
746 def makefilestorage(requirements, **kwargs): | 756 def makefilestorage(requirements, **kwargs): |
747 """Produce a type conforming to ``ilocalrepositoryfilestorage``.""" | 757 """Produce a type conforming to ``ilocalrepositoryfilestorage``.""" |
748 return revlogfilestorage | 758 if repository.NARROW_REQUIREMENT in requirements: |
759 return revlognarrowfilestorage | |
760 else: | |
761 return revlogfilestorage | |
749 | 762 |
750 # List of repository interfaces and factory functions for them. Each | 763 # List of repository interfaces and factory functions for them. Each |
751 # will be called in order during ``makelocalrepository()`` to iteratively | 764 # will be called in order during ``makelocalrepository()`` to iteratively |
752 # derive the final type for a local repository instance. | 765 # derive the final type for a local repository instance. |
753 REPO_INTERFACES = [ | 766 REPO_INTERFACES = [ |