$ git clone -n https://src.fedoraproject.org/rpms/guitarix.git /var/lib/mock/f45-build-13245-447/root/chroot_tmpdir/scmroot/guitarix
Cloning into '/var/lib/mock/f45-build-13245-447/root/chroot_tmpdir/scmroot/guitarix'...
$ git fetch origin e5e5ec7c9394bf6e2db2ed6d9974a93c4c73cded:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/guitarix
 * [new ref]         e5e5ec7c9394bf6e2db2ed6d9974a93c4c73cded -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e5e5ec7 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild