$ git clone -n https://src.fedoraproject.org/rpms/darktable.git /var/lib/mock/f41-build-857912-168259/root/chroot_tmpdir/scmroot/darktable
Cloning into '/var/lib/mock/f41-build-857912-168259/root/chroot_tmpdir/scmroot/darktable'...
$ git fetch origin 6c7268641ab3f5011569cf6cc827e4988854e318:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/darktable
 * [new ref]         6c7268641ab3f5011569cf6cc827e4988854e318 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6c72686  adds 17257.patch