$ git clone -n https://src.fedoraproject.org/rpms/librepo.git /var/lib/mock/f41-build-side-1-2812319-32939/root/chroot_tmpdir/scmroot/librepo
Cloning into '/var/lib/mock/f41-build-side-1-2812319-32939/root/chroot_tmpdir/scmroot/librepo'...
$ git fetch origin 373c77e0f7dabc60b5147a046a54d52071b58fa2:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/librepo
 * [new ref]         373c77e0f7dabc60b5147a046a54d52071b58fa2 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 373c77e Update to 1.18.1