$ git clone -n https://src.fedoraproject.org/rpms/perl-Gtk2-Ex-Utils.git /var/lib/mock/f39-build-1620056-38678/root/chroot_tmpdir/scmroot/perl-Gtk2-Ex-Utils
Cloning into '/var/lib/mock/f39-build-1620056-38678/root/chroot_tmpdir/scmroot/perl-Gtk2-Ex-Utils'...
$ git fetch origin 7b61f8da816d337b6cb9031461a9501349d6d3a9:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Gtk2-Ex-Utils
 * [new ref]         7b61f8da816d337b6cb9031461a9501349d6d3a9 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 7b61f8d Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild