$ git clone -n https://src.fedoraproject.org/rpms/imagej.git /var/lib/mock/f41-build-side-1-2820270-33145/root/chroot_tmpdir/scmroot/imagej
Cloning into '/var/lib/mock/f41-build-side-1-2820270-33145/root/chroot_tmpdir/scmroot/imagej'...
$ git fetch origin 8dd56b3d2aff0ba327a4ee8ac0f1417de212831c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/imagej
 * [new ref]         8dd56b3d2aff0ba327a4ee8ac0f1417de212831c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 8dd56b3 Update to 1.54k (close RHBZ#2292095)