$ git clone -n https://src.fedoraproject.org/rpms/perl-Language-Functional.git /var/lib/mock/f45-build-24392-603/root/chroot_tmpdir/scmroot/perl-Language-Functional
Cloning into '/var/lib/mock/f45-build-24392-603/root/chroot_tmpdir/scmroot/perl-Language-Functional'...
$ git fetch origin 6acf86d234993c1928c6af0e21af804014fa1da7:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Language-Functional
 * [new ref]         6acf86d234993c1928c6af0e21af804014fa1da7 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6acf86d Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild