$ git clone -n https://src.fedoraproject.org/rpms/golang-github-bep-gowebp.git /var/lib/mock/f40-build-2240843-53649/root/chroot_tmpdir/scmroot/golang-github-bep-gowebp
Cloning into '/var/lib/mock/f40-build-2240843-53649/root/chroot_tmpdir/scmroot/golang-github-bep-gowebp'...
$ git fetch origin 80db51f6487342a44004271666f9284d4f68621e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/golang-github-bep-gowebp
 * [new ref]         80db51f6487342a44004271666f9284d4f68621e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 80db51f Update to 0.3.0