$ git clone -n https://src.fedoraproject.org/rpms/darktable.git /var/lib/mock/f41-build-815458-149534/root/chroot_tmpdir/scmroot/darktable
Cloning into '/var/lib/mock/f41-build-815458-149534/root/chroot_tmpdir/scmroot/darktable'...
$ git fetch origin 75d750e3cc9c64a7a4aea54820769a7dec7d9fa6:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/darktable
 * [new ref]         75d750e3cc9c64a7a4aea54820769a7dec7d9fa6 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 75d750e Rebuilt for exiv2 0.28.2