$ git clone -n https://src.fedoraproject.org/rpms/perl-lib-relative.git /var/lib/mock/f45-build-27688-625/root/chroot_tmpdir/scmroot/perl-lib-relative
Cloning into '/var/lib/mock/f45-build-27688-625/root/chroot_tmpdir/scmroot/perl-lib-relative'...
$ git fetch origin 3e672ddc3654e0e8a47b4326a680bb3e93122bfe:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-lib-relative
 * [new ref]         3e672ddc3654e0e8a47b4326a680bb3e93122bfe -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3e672dd Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild