$ git clone -n https://src.fedoraproject.org/rpms/perl-Gtk2-Spell.git /var/lib/mock/f41-build-1099138-20020/root/chroot_tmpdir/scmroot/perl-Gtk2-Spell
Cloning into '/var/lib/mock/f41-build-1099138-20020/root/chroot_tmpdir/scmroot/perl-Gtk2-Spell'...
$ git fetch origin 56a3eaa510dc7b20fed98c4e6ce18518d3f6c419:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Gtk2-Spell
 * [new ref]         56a3eaa510dc7b20fed98c4e6ce18518d3f6c419 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 56a3eaa Perl 5.40 rebuild