$ git clone -n https://src.fedoraproject.org/rpms/grpcurl.git /var/lib/mock/f45-build-13060-446/root/chroot_tmpdir/scmroot/grpcurl
Cloning into '/var/lib/mock/f45-build-13060-446/root/chroot_tmpdir/scmroot/grpcurl'...
$ git fetch origin 1aa1cda2b6ffc087540ba6d2b7558fee88b8634c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/grpcurl
 * [new ref]         1aa1cda2b6ffc087540ba6d2b7558fee88b8634c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 1aa1cda Update to 1.9.4 - Closes rhbz#2526612