$ git clone -n https://src.fedoraproject.org/rpms/stgit.git /var/lib/mock/f41-build-820168-152085/root/chroot_tmpdir/scmroot/stgit
Cloning into '/var/lib/mock/f41-build-820168-152085/root/chroot_tmpdir/scmroot/stgit'...
$ git fetch origin 877a6335b9fa8372f4bc6b80032163c0d48e1391:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/stgit
 * [new ref]         877a6335b9fa8372f4bc6b80032163c0d48e1391 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 877a633 Update to v2.4.8 (rhbz#2299433)