$ git clone -n https://src.fedoraproject.org/rpms/perl-System-Info.git /var/lib/mock/f45-build-26355-617/root/chroot_tmpdir/scmroot/perl-System-Info
Cloning into '/var/lib/mock/f45-build-26355-617/root/chroot_tmpdir/scmroot/perl-System-Info'...
$ git fetch origin 4cf58f1ad092d8a447eca04ab96b9ae5366830d3:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-System-Info
 * [new ref]         4cf58f1ad092d8a447eca04ab96b9ae5366830d3 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 4cf58f1 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild