$ git clone -n https://src.fedoraproject.org/rpms/perl-IPC-Filter.git /var/lib/mock/f45-build-24199-602/root/chroot_tmpdir/scmroot/perl-IPC-Filter
Cloning into '/var/lib/mock/f45-build-24199-602/root/chroot_tmpdir/scmroot/perl-IPC-Filter'...
$ git fetch origin 66a462800d86d54f0134547cdb6169082f50b355:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-IPC-Filter
 * [new ref]         66a462800d86d54f0134547cdb6169082f50b355 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 66a4628 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild