Re: [PATCH v2 13/23] worktree: introduce "add" command

On Sat, Jul 4, 2015 at 7:17 AM, Eric Sunshine [off-list ref] wrote:

 COMMANDS
 --------
+add <path> <branch>::
+
+Check out `<branch>` into a separate working directory, `<path>`, creating
+`<path>` if necessary. The new working directory is linked to the current
+repository, sharing everything except working directory specific files
+such as HEAD, index, etc. If `<path>` already exists, it must be empty.

Side note, "must be empty" is an implementation limitation. I think
the two-way merge employed by git-checkout can deal with dirty <path>
and only perform the checkout if there is no data loss. But we can
leave this for later.
-- 
Duy