Enables specifying a name for a repo that is used in the cache key.
This allows multiple repos on a machine to share a cache without the
risk of keys overlapping.
The previous algorithm thought that if the system cache had the file rev, it was
guaranteed to be valid. This isn't true in the case of a machine in which
multiple people share the cache (one person may have pulled a rev but the other
hasn't).
The new algorithm is more explicit. It checks:
- system cache
- local cache
- local cache fallbacks
- remote cache
- master server
The remotefilelog extension currently doesn't work with tags. Adding include and
exclude patterns allows users to specify which files they want to treat as
shallow and which the want to download the entire history for. By excluding
.hgtags from being shallow, this enables tags to work in a mostly shallow repo.
This also enables largefile like scenarios where most files are full and only a
few large ones are kept remote.
A rare bug can occur where the local file blob might not exist, but a valid old
version of that blob does exist. This refactor the linknode logic in ancestormap
to check the old versions if the server fetch fails to find the blob.
It still prints an ugly warning message from the server, but this whole issue is
quite rare anyway.
