$ git clone -n https://src.fedoraproject.org/rpms/nomacs.git /var/lib/mock/f41-build-1280148-23177/root/chroot_tmpdir/scmroot/nomacs
Cloning into '/var/lib/mock/f41-build-1280148-23177/root/chroot_tmpdir/scmroot/nomacs'...
$ git fetch origin 9e838d57def912c2156d7725d7b7a315a10184eb:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/nomacs
 * [new ref]         9e838d57def912c2156d7725d7b7a315a10184eb -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 9e838d5 Rebuilt for exiv2 0.28.2