$ git clone -n https://src.fedoraproject.org/rpms/elvish.git /var/lib/mock/f45-build-8030-372/root/chroot_tmpdir/scmroot/elvish
Cloning into '/var/lib/mock/f45-build-8030-372/root/chroot_tmpdir/scmroot/elvish'...
$ git fetch origin 79ed36b3148eb6dc3dc7bf0dae33a169e90cdfd9:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/elvish
 * [new ref]         79ed36b3148eb6dc3dc7bf0dae33a169e90cdfd9 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 79ed36b Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild