$ git clone -n https://src.fedoraproject.org/rpms/cowsay.git /var/lib/mock/f40-build-1979395-25240/root/chroot_tmpdir/scmroot/cowsay
Cloning into '/var/lib/mock/f40-build-1979395-25240/root/chroot_tmpdir/scmroot/cowsay'...
$ git fetch origin 1ca832c699ef2697f862fc7f72aae77aa88aca80:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/cowsay
 * [new ref]         1ca832c699ef2697f862fc7f72aae77aa88aca80 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 1ca832c Install CHANGELOG.md doc file