$ git clone -n https://src.fedoraproject.org/rpms/pkgconf.git /var/lib/mock/f45-bootstrap-296-177/root/chroot_tmpdir/scmroot/pkgconf
Cloning into '/var/lib/mock/f45-bootstrap-296-177/root/chroot_tmpdir/scmroot/pkgconf'...
$ git fetch origin 75a6859a46954a834a8a534d339799b1beb82a73:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/pkgconf
 * [new ref]         75a6859a46954a834a8a534d339799b1beb82a73 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 75a6859 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild