view CONTRIBUTING @ 35508:6bb940de4c4c

lfs: add the 'lfs' requirement in the changegroup transaction introducing lfs

A hook like this is how largefiles manages to do the same.  Largefiles uses a
changegroup hook, but this uses pretxnchangegroup because that actually causes
the transaction to rollback in the unlikely event that writing the requirements
out fails.  Sadly, the requires file itself isn't rolled back if a subsequent
hook fails, but that seems trivial.

Now that commit, changegroup and convert are covered, I don't think there's any
way to get an lfs repo without the requirement.

The grep exit code is blotted out of some test-lfs-serve.t tests now showing the
requirement, because run-tests.py doesn't support conditionalizing the exit
code.

Our full contribution guidelines are in our wiki, please see:

https://www.mercurial-scm.org/wiki/ContributingChanges

If you just want a checklist to follow, you can go straight to

https://www.mercurial-scm.org/wiki/ContributingChanges#Submission_checklist

If you can't run the entire testsuite for some reason (it can be
difficult on Windows), please at least run `contrib/check-code.py` on
any files you've modified and run `python contrib/check-commit` on any
commits you've made (for example, `python contrib/check-commit
273ce12ad8f1` will report some style violations on a very old commit).