$ git clone -n https://src.fedoraproject.org/rpms/rust-parsec-interface.git /var/lib/mock/f40-build-2642689-66467/root/chroot_tmpdir/scmroot/rust-parsec-interface
Cloning into '/var/lib/mock/f40-build-2642689-66467/root/chroot_tmpdir/scmroot/rust-parsec-interface'...
$ git fetch origin 31a810d72f56c59f24d226da0058c3695431f188:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-parsec-interface
 * [new ref]         31a810d72f56c59f24d226da0058c3695431f188 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 31a810d Rebuild for prost