$ git clone -n https://src.fedoraproject.org/rpms/sane-airscan.git /var/lib/mock/f45-build-35555-696/root/chroot_tmpdir/scmroot/sane-airscan
Cloning into '/var/lib/mock/f45-build-35555-696/root/chroot_tmpdir/scmroot/sane-airscan'...
$ git fetch origin a19186d2ffc0980e913301781b4551e1af88a0c3:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/sane-airscan
 * [new ref]         a19186d2ffc0980e913301781b4551e1af88a0c3 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a19186d Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild