$ git clone -n https://src.fedoraproject.org/rpms/iwd.git /var/lib/mock/f39-build-1535932-36252/root/chroot_tmpdir/scmroot/iwd
Cloning into '/var/lib/mock/f39-build-1535932-36252/root/chroot_tmpdir/scmroot/iwd'...
$ git fetch origin b846ab761b030ecb096770b7bf3acc89fb0a5bc0:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/iwd
 * [new ref]         b846ab761b030ecb096770b7bf3acc89fb0a5bc0 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b846ab7 2.8