$ git clone -n https://src.fedoraproject.org/rpms/libu2f-server.git /var/lib/mock/f45-build-17164-496/root/chroot_tmpdir/scmroot/libu2f-server
Cloning into '/var/lib/mock/f45-build-17164-496/root/chroot_tmpdir/scmroot/libu2f-server'...
$ git fetch origin f66b184d10e649b800176cd93bedc4193f20769c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libu2f-server
 * [new ref]         f66b184d10e649b800176cd93bedc4193f20769c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f66b184 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild