$ git clone -n https://src.fedoraproject.org/rpms/perl-Gtk2-Spell.git /var/lib/mock/f45-build-23845-599/root/chroot_tmpdir/scmroot/perl-Gtk2-Spell
Cloning into '/var/lib/mock/f45-build-23845-599/root/chroot_tmpdir/scmroot/perl-Gtk2-Spell'...
$ git fetch origin 73a91786855354b595e6fd27dc6ee1fd818dfb03:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Gtk2-Spell
 * [new ref]         73a91786855354b595e6fd27dc6ee1fd818dfb03 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 73a9178 Perl 5.44 rebuild