git-arc: Try to make patching more useful

[markj]

Summary

Add a raw mode, which fetches the patch file and applies it manually
rather than using arc patch. This is handy because arc patch will
always try to fetch your remotes if it can't find the base commit in
your repo (even if you ask it not to make a commit). This is basically
unusable in some of my workspaces where I have 20+ remotes configured,
some of which may be unreachable.

Add a stack mode, which causes git-arc to recursively apply parent
revisions, going up the patch stack. Thus, to apply a full patch stack,
just apply the final patch with -s.

[ngie]

tools/tools/git/git-arc.sh

62

Are the flags for these commands documented anywhere?

[markj]

tools/tools/git/git-arc.sh

62

I documented them in a follow up, see D54405, next patch in the stack.

[ngie]

tools/tools/git/git-arc.sh

62

Got it! One thing that would be nice and avoid some of the duplicate documentation would be if --help, etc, punted someone into the git-arc manpage like git commit --help does.
git arc --help seems to do that :D. That way the usage message output can be made more terse--and hence fit into a reasonably sized single terminal window.

[markj]

tools/tools/git/git-arc.sh

62

That could be useful yes, but it won't be done in this patch.