$ git clone -n https://src.fedoraproject.org/rpms/toot.git /var/lib/mock/f39-build-2011057-45662/root/chroot_tmpdir/scmroot/toot
Cloning into '/var/lib/mock/f39-build-2011057-45662/root/chroot_tmpdir/scmroot/toot'...
$ git fetch origin 2dc6ab38a160a0b7b896181fd158e7432a96b0ab:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/toot
 * [new ref]         2dc6ab38a160a0b7b896181fd158e7432a96b0ab -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 2dc6ab3 Update to 0.39.0