Summary:
The old mercurial.dispatch entry point works, except it breaks
extensions wrapping `dispatch.*` (ex. `dispatch.runcommand`).
That is because things happen in this order:
- Buck's python wrapper imports `mercurial.dispatch` as mod1.
- hgdemandimport is enabled.
- An extension imports `mercurial.dispatch` and it got mod2.
- mod2 != mod1. So any changes to mod2 won't be used.
Using a separate module (`mercurial.main`) as the entry point
solves the problem.
Reviewed By: DurhamG
Differential Revision: D6879873
fbshipit-source-id: 9779edac64bbeb53dd98dfab1b21575c3a60af01
