$ git clone -n https://src.fedoraproject.org/rpms/yubikey-val.git /var/lib/mock/f45-build-39300-733/root/chroot_tmpdir/scmroot/yubikey-val
Cloning into '/var/lib/mock/f45-build-39300-733/root/chroot_tmpdir/scmroot/yubikey-val'...
$ git fetch origin 3e904b27e9a2da2c6cc3979bd091b2742bbe1058:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/yubikey-val
 * [new ref]         3e904b27e9a2da2c6cc3979bd091b2742bbe1058 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3e904b2 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild