Is there a way to restrict git-annex-shell to a specific directory? Currently, if git-annex is paired to a remote repository, it adds this to the authorized_keys:

$ cat ~/.ssh/authorized_keys
command="~/.ssh/git-annex-shell",no-agent-forwarding,no-port-forwarding,no-X11-forwarding ssh-rsa AAAAB3...

$ cat ~/.ssh/git-annex-shell 
#!/bin/sh
set -e
exec git-annex-shell -c "$SSH_ORIGINAL_COMMAND"

That gives whoever has the pubkey the right to access all repositories of one user. It would be nice to have a manual way to limit the access to a specific repository like

$ cat ~/.ssh/git-annex-shell 
#!/bin/sh
set -e
export GIT_ANNEX_SHELL_REPO=~/annex
exec git-annex-shell -c "$SSH_ORIGINAL_COMMAND"

Or maybe some chroot hackery is the way to go?