Summary:
When a machine is newly set up, it needs to have the git mapfile available. Generating it from scratch is prohibitively slow for large repos like `configerator`, so instead add a command that can download the entire git metadata from a server that has it.
This is a temporary hack while I work on a real fix to upstream to hg-git. A real fix would be
- part of hg-git
- not send the entire git metadata over, just the bits that are needed based on a common/heads computation
- be dependent on bundle2
- (probably) be part of the pull operation, not a separate command
- be configurable with an option
This isn't part of hg-git, even in a private branch, to emphasize its temporary nature. `gitlookup` might also not be the best fit, but I want to avoid adding yet another extension for a temporary hack.
Test Plan:
Ran the following commands. Note that the current version of `hg` deployed to devservers is broken, so we need to deploy an updated hg before enabling this. These commands were tested against 1ced7c762592
(in `fbandroid-hg`, with `gitlookup` enabled on both ends and the remotefilelog fix in D1341059)
hg gitgetmeta ../fbandroid-from-git
Saw that 3 files were written out.
hg gitgetmeta ssh://localhost//data/users/sid0/fbandroid-from-git
Saw that 3 files were written out.
Reviewers: dschleimer, davidsp, akushner, durham, pyd
Reviewed By: pyd
Differential Revision: https://phabricator.fb.com/D1341166
Tasks: 3751836
