$ git clone -n https://src.fedoraproject.org/rpms/perl-Authen-U2F.git /var/lib/mock/f45-build-21803-588/root/chroot_tmpdir/scmroot/perl-Authen-U2F
Cloning into '/var/lib/mock/f45-build-21803-588/root/chroot_tmpdir/scmroot/perl-Authen-U2F'...
$ git fetch origin 2eafa902dc8e04edbc1a13e0567f0074560a40b9:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Authen-U2F
 * [new ref]         2eafa902dc8e04edbc1a13e0567f0074560a40b9 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 2eafa90 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild