$ git clone -n https://src.fedoraproject.org/rpms/perl-HTTP-Headers-Fast.git /var/lib/mock/f45-build-24019-601/root/chroot_tmpdir/scmroot/perl-HTTP-Headers-Fast
Cloning into '/var/lib/mock/f45-build-24019-601/root/chroot_tmpdir/scmroot/perl-HTTP-Headers-Fast'...
$ git fetch origin f698e5ee9568b0399a14cc9598aed7bffa4f0814:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-HTTP-Headers-Fast
 * [new ref]         f698e5ee9568b0399a14cc9598aed7bffa4f0814 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f698e5e Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild