[PATCH evolve-ext] fold: allow folding one revision with --exact if rewriting is necessary

[Siddharth Agarwal]

On 3/7/16 07:57, Pierre-Yves David wrote:
>
>
> On 03/02/2016 01:01 AM, Siddharth Agarwal wrote:
>> # HG changeset patch
>> # User Siddharth Agarwal <sid0 at fb.com>
>> # Date 1456876756 28800
>> #      Tue Mar 01 15:59:16 2016 -0800
>> # Branch stable
>> # Node ID def16bbc29a4c23ea7dd2dcb00abbcaa6e89b575
>> # Parent  160968654581eb83f58f2b913124a16f7bef56ee
>> fold: allow folding one revision with --exact if rewriting is necessary
>
> I'm not super enthousiastic at the idea of seeing `hg fold` used as a 
> command to rewrite a random commit meta-data. I'll have to think about 
> it a bit more.

FWIW, I believe the requirements should be:
- allow rewriting one or rewriting + combining a linear series of 
multiple changesets in the same command
- lets you rewrite all commit metadata
- do it to any series of non-public commits in the DAG even if unrelated 
to the working copy
- the operation shouldn't trigger any merge logic

I'm ok with a new 'hg rewrite' command or similar, but I thought that 
'fold' was a fairly straightforward fit.

- Siddharth


>
> I think we could find a better command to support this usecase.
>