post-update to stash after push to non-bare current branch

["Neal Kreitzinger" <neal@rsss.com>]

We use the worktree of git-repos as the webroot for virtual hosts assigned 
to ports so we can directly test changes to dev and test git-repos.  We have 
some developers who want to develop offline on laptops and push to these 
non-bare repos so they can test their changes.  My plan is to set 
receive.denyCurrentBranch = warn, and then use the post-update hook on the 
remote non-bare to do a stash of the worktree and index.  My assumption is 
that post-update hook only executes after a successful push.  Correct?  I 
only want to stash the non-bare remote work-tree and index after a 
successful push to it (effectively doing a git-reset --hard, but also 
keeping any changes to the worktree/index of the non-bare remote as a safety 
in case someone does directly make uncommitted changes on the non-bare 
remote.)

v/r,
neal