$ git clone -n https://src.fedoraproject.org/rpms/serialdv.git /var/lib/mock/f45-build-35786-699/root/chroot_tmpdir/scmroot/serialdv
Cloning into '/var/lib/mock/f45-build-35786-699/root/chroot_tmpdir/scmroot/serialdv'...
$ git fetch origin 266b729f97cb7b58c44dbf23855582dd0fd7e301:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/serialdv
 * [new ref]         266b729f97cb7b58c44dbf23855582dd0fd7e301 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 266b729 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild