$ git clone -n https://src.fedoraproject.org/rpms/rust-prost-types.git /var/lib/mock/f40-build-2653494-66901/root/chroot_tmpdir/scmroot/rust-prost-types
Cloning into '/var/lib/mock/f40-build-2653494-66901/root/chroot_tmpdir/scmroot/rust-prost-types'...
$ git fetch origin 3eba0c8e4124231346f2599244c998f8a3a72757:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-prost-types
 * [new ref]         3eba0c8e4124231346f2599244c998f8a3a72757 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3eba0c8 0.10.1