Add DummyStore (dummy://)

DummyStore does not allow building or adding paths. This is useful for
evaluation tests when you don't want to initialize a "proper" store.
This commit is contained in:
Eelco Dolstra 2020-08-24 18:54:16 +02:00
parent d0690bc311
commit 6a67e57019
No known key found for this signature in database
GPG key ID: 8170B4726D7198DE
3 changed files with 61 additions and 1 deletions

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@ -0,0 +1,59 @@
#include "store-api.hh"
namespace nix {
static std::string uriScheme = "dummy://";
struct DummyStore : public Store
{
DummyStore(const Params & params)
: Store(params)
{ }
string getUri() override
{
return uriScheme;
}
void queryPathInfoUncached(const StorePath & path,
Callback<std::shared_ptr<const ValidPathInfo>> callback) noexcept override
{
callback(nullptr);
}
std::optional<StorePath> queryPathFromHashPart(const std::string & hashPart) override
{ unsupported("queryPathFromHashPart"); }
void addToStore(const ValidPathInfo & info, Source & source,
RepairFlag repair, CheckSigsFlag checkSigs) override
{ unsupported("addToStore"); }
StorePath addToStore(const string & name, const Path & srcPath,
FileIngestionMethod method, HashType hashAlgo,
PathFilter & filter, RepairFlag repair) override
{ unsupported("addToStore"); }
StorePath addTextToStore(const string & name, const string & s,
const StorePathSet & references, RepairFlag repair) override
{ unsupported("addTextToStore"); }
void narFromPath(const StorePath & path, Sink & sink) override
{ unsupported("narFromPath"); }
void ensurePath(const StorePath & path) override
{ unsupported("ensurePath"); }
BuildResult buildDerivation(const StorePath & drvPath, const BasicDerivation & drv,
BuildMode buildMode) override
{ unsupported("buildDerivation"); }
};
static RegisterStoreImplementation regStore([](
const std::string & uri, const Store::Params & params)
-> std::shared_ptr<Store>
{
if (uri != uriScheme) return nullptr;
return std::make_shared<DummyStore>(params);
});
}

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@ -185,7 +185,7 @@ void mainWrapped(int argc, char * * argv)
} }
if (argc == 2 && std::string(argv[1]) == "__dump-builtins") { if (argc == 2 && std::string(argv[1]) == "__dump-builtins") {
EvalState state({}, openStore("ssh://foo.invalid/")); EvalState state({}, openStore("dummy://"));
auto res = nlohmann::json::object(); auto res = nlohmann::json::object();
auto builtins = state.baseEnv.values[0]->attrs; auto builtins = state.baseEnv.values[0]->attrs;
for (auto & builtin : *builtins) { for (auto & builtin : *builtins) {

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@ -1,6 +1,7 @@
source common.sh source common.sh
export TEST_VAR=foo # for eval-okay-getenv.nix export TEST_VAR=foo # for eval-okay-getenv.nix
export NIX_REMOTE=dummy://
nix-instantiate --eval -E 'builtins.trace "Hello" 123' 2>&1 | grep -q Hello nix-instantiate --eval -E 'builtins.trace "Hello" 123' 2>&1 | grep -q Hello
(! nix-instantiate --show-trace --eval -E 'builtins.addErrorContext "Hello" 123' 2>&1 | grep -q Hello) (! nix-instantiate --show-trace --eval -E 'builtins.addErrorContext "Hello" 123' 2>&1 | grep -q Hello)