`arc` changes my commit messages

[Edward Z. Yang]

For a while, I tried working around this using a "branch summary patch",
which is just an empty commit I kept on top of the patchset which then
Phabricator would hit.

It was really annoying and Git kept swallowing up. So I eventually gave
up and just arc diff'd each patch in the set individually.

Edward

Excerpts from Richard Eisenberg's message of 2014-10-21 06:34:31 -0700:
> Hi all,
> 
> Is there a way to put `arc` into a read-only mode?
> 
> Frequently while working on a patch, I make several commits, preferring to separate out testing commits from productive work commits and non-productive (whitespace, comments) commits. Sometimes each of these categories are themselves broken into several commits. These commits are *not* my internal workflow. They are intentionally curated by rebasing as I'm ready to publish the patch, as I think the patches are easy to read this way. (Tell me if I'm wrong, here!) I've resolved myself not to use `arc land`, but instead to apply the patch using git.
> 
> Yet, when I call `arc diff`, even if I haven't amended my patch during the `arc diff`ing process, the commit message of the tip of my branch is changed, and without telling me. I recently pushed my (tiny, uninteresting) fix to #9692. Luckily, my last commit happened to be the meat, so the amended commit message is still wholly relevant. But, that won't always be the case, and I was surprised to see a Phab-ified commit message appear in the Trac ticket after pushing.
> 
> I know I could use more git-ery to restore my old commit message. But is there a way to stop `arc` from doing the message change in the first place?
> 
> Thanks!
> Richard