$ git clone -n https://src.fedoraproject.org/rpms/grpc.git /var/lib/mock/f41-build-808434-145857/root/chroot_tmpdir/scmroot/grpc
Cloning into '/var/lib/mock/f41-build-808434-145857/root/chroot_tmpdir/scmroot/grpc'...
$ git fetch origin 0b6a412abb0fddb373b6b779103f6f736a17432d:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/grpc
 * [new ref]         0b6a412abb0fddb373b6b779103f6f736a17432d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 0b6a412 Add riscv64 support