$ git clone -n https://src.fedoraproject.org/rpms/imagej.git /var/lib/mock/f39-build-1494656-34542/root/chroot_tmpdir/scmroot/imagej
Cloning into '/var/lib/mock/f39-build-1494656-34542/root/chroot_tmpdir/scmroot/imagej'...
$ git fetch origin 7e28a406025defab15038cdf7608daeb660572b3:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/imagej
 * [new ref]         7e28a406025defab15038cdf7608daeb660572b3 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 7e28a40 Update to 1.54g (close RHBZ#2244933)