$ git clone -n https://src.fedoraproject.org/rpms/gnu-free-fonts.git /var/lib/mock/f40-build-1999315-44329/root/chroot_tmpdir/scmroot/gnu-free-fonts
Cloning into '/var/lib/mock/f40-build-1999315-44329/root/chroot_tmpdir/scmroot/gnu-free-fonts'...
$ git fetch origin e440eb5a5c8c1e59664b53430efa92b76e6b86b8:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gnu-free-fonts
 * [new ref]         e440eb5a5c8c1e59664b53430efa92b76e6b86b8 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e440eb5 Drop req on 2to3