$ git clone -n https://src.fedoraproject.org/rpms/darktable.git /var/lib/mock/f41-build-1034599-18640/root/chroot_tmpdir/scmroot/darktable
Cloning into '/var/lib/mock/f41-build-1034599-18640/root/chroot_tmpdir/scmroot/darktable'...
$ git fetch origin 1df703c285327754660ef45f2165fe843a1a3250:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/darktable
 * [new ref]         1df703c285327754660ef45f2165fe843a1a3250 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 1df703c Rebuilt for exiv2 0.28.2