$ git clone -n https://src.fedoraproject.org/rpms/perl-Sub-Exporter.git /var/lib/mock/f45-build-26401-617/root/chroot_tmpdir/scmroot/perl-Sub-Exporter
Cloning into '/var/lib/mock/f45-build-26401-617/root/chroot_tmpdir/scmroot/perl-Sub-Exporter'...
$ git fetch origin 061232c4647a87c7915402895c9ffcffd8311b4a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Sub-Exporter
 * [new ref]         061232c4647a87c7915402895c9ffcffd8311b4a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 061232c Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild