stack.sh should update checkouts

[anotherjesse]

this will overwrite local changes.

any clues on how to not do that?

[sleepsonthefloor]

If origin has changed, mayybe just rm/mv the entire directory and clone from scratch?

[sleepsonthefloor]

something like this could update the origin:

git remote rm origin
git remote add origin $GIT_ORIGIN
git fetch

[sleepsonthefloor]

Some comments inline above, but in summary I think the following would be nice:

• If there are local changes (or un-pushed commits), ask user if it is ok to delete them. Abort running if answer is no.
• If origin has changed, make sure that the code is switched accordingly. I'd be ok with a clean checkout in this circumstance, but an origin switch would probably be fine but possibly more clunky
• Switch to a syntax for checking out a clean branch that works with tags - swapping out your git reset strategy may be enough to pull that off

[anotherjesse]

we aren't going to merge this