$ git clone -n https://src.fedoraproject.org/rpms/libu2f-host.git /var/lib/mock/f45-build-17147-496/root/chroot_tmpdir/scmroot/libu2f-host
Cloning into '/var/lib/mock/f45-build-17147-496/root/chroot_tmpdir/scmroot/libu2f-host'...
$ git fetch origin f0bf4e9e235e736f9f94c551aff02704d09a7dd3:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libu2f-host
 * [new ref]         f0bf4e9e235e736f9f94c551aff02704d09a7dd3 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f0bf4e9 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild