$ git clone -n https://src.fedoraproject.org/rpms/perl-Data-Clone.git /var/lib/mock/f45-build-22850-594/root/chroot_tmpdir/scmroot/perl-Data-Clone
Cloning into '/var/lib/mock/f45-build-22850-594/root/chroot_tmpdir/scmroot/perl-Data-Clone'...
$ git fetch origin 8cd9cd300ded88b5fc777dfa82ed708eecd786c7:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Data-Clone
 * [new ref]         8cd9cd300ded88b5fc777dfa82ed708eecd786c7 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 8cd9cd3 Perl 5.44 rebuild