$ git clone -n https://src.fedoraproject.org/rpms/tuxpaint.git /var/lib/mock/f39-build-1579967-38048/root/chroot_tmpdir/scmroot/tuxpaint
Cloning into '/var/lib/mock/f39-build-1579967-38048/root/chroot_tmpdir/scmroot/tuxpaint'...
$ git fetch origin 9bdacc9a7ad9466c75e643dd2f08058893b9a0f1:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/tuxpaint
 * [new ref]         9bdacc9a7ad9466c75e643dd2f08058893b9a0f1 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 9bdacc9 Fix flatpak build