$ git clone -n https://src.fedoraproject.org/rpms/tmux.git /var/lib/mock/f39-build-1558180-37303/root/chroot_tmpdir/scmroot/tmux
Cloning into '/var/lib/mock/f39-build-1558180-37303/root/chroot_tmpdir/scmroot/tmux'...
$ git fetch origin 0a17865d0f48862bda9184ea5ffaadaa1660b462:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/tmux
 * [new ref]         0a17865d0f48862bda9184ea5ffaadaa1660b462 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 0a17865 update to snapshot