$ git clone -n https://src.fedoraproject.org/rpms/tinyproxy.git /var/lib/mock/f40-build-805522-144806/root/chroot_tmpdir/scmroot/tinyproxy
Cloning into '/var/lib/mock/f40-build-805522-144806/root/chroot_tmpdir/scmroot/tinyproxy'...
$ git fetch origin 2d77f1aecd063f6a437289aec71fa40299a73407:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/tinyproxy
 * [new ref]         2d77f1aecd063f6a437289aec71fa40299a73407 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 2d77f1a Run daemon in foreground to remove the need for pidfile tracking