$ git clone -n https://src.fedoraproject.org/rpms/perl-Data-Structure-Util.git /var/lib/mock/f45-build-22963-595/root/chroot_tmpdir/scmroot/perl-Data-Structure-Util
Cloning into '/var/lib/mock/f45-build-22963-595/root/chroot_tmpdir/scmroot/perl-Data-Structure-Util'...
$ git fetch origin 6232b6aa6ff0a1b08a1337e8056e408fa003528d:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Data-Structure-Util
 * [new ref]         6232b6aa6ff0a1b08a1337e8056e408fa003528d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6232b6a Perl 5.44 rebuild