$ git clone -n https://src.fedoraproject.org/rpms/darktable.git /var/lib/mock/f40-build-1723445-24647/root/chroot_tmpdir/scmroot/darktable
Cloning into '/var/lib/mock/f40-build-1723445-24647/root/chroot_tmpdir/scmroot/darktable'...
$ git fetch origin 8340b9ee4c689eed04e4252e7c9aec4c38c6828f:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/darktable
 * [new ref]         8340b9ee4c689eed04e4252e7c9aec4c38c6828f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 8340b9e 4.8.0 release