Function runFetchClosureWithContentAddressedPath

src/libexpr/primops/fetchClosure.cc:75–99

* Fetch the closure and make sure it's content addressed. */

 * Fetch the closure and make sure it's content addressed.
 */
static void runFetchClosureWithContentAddressedPath(
    EvalState & state, const PosIdx pos, Store & fromStore, const StorePath & fromPath, Value & v)
{

    if (!state.store->isValidPath(fromPath))
        copyClosure(fromStore, *state.store, RealisedPath::Set{fromPath});

    auto info = state.store->queryPathInfo(fromPath);

    if (!info->isContentAddressed(*state.store)) {
        throw Error(
            {.msg = HintFmt(
                 "The 'fromPath' value '%s' is input-addressed, but 'inputAddressed' is set to 'false' (default).\n\n"
                 "If you do intend to fetch an input-addressed store path, add\n\n"
                 "    inputAddressed = true;\n\n"
                 "to the 'fetchClosure' arguments.\n\n"
                 "Note that to ensure authenticity input-addressed store paths, users must configure a trusted binary cache public key on their systems. This is not needed for content-addressed paths.",
                 state.store->printStorePath(fromPath)),
             .pos = state.positions[pos]});
    }

    state.allowClosure(fromPath);

    state.mkStorePathString(fromPath, v);
}

/**
 * Fetch the closure and make sure it's input addressed.