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Fix derivation load assertion errors

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When loading a derivation from a JSON, malformed input would trigger
cryptic "assertion failed" errors. Simply replacing calls to `operator []`
with calls to `.at()` was not enough, as this would cause json.execptions
to be printed verbatim.

Display nice error messages instead and give some indication where the
error happened.

*Before:*

```
$ echo 4 | nix derivation add
error: [json.exception.type_error.305] cannot use operator[] with a string argument with number

$ nix derivation show nixpkgs#hello | nix derivation add
Assertion failed: (it != m_value.object->end()), function operator[], file /nix/store/8h9pxgq1776ns6qi5arx08ifgnhmgl22-nlohmann_json-3.11.2/include/nlohmann/json.hpp, line 2135.

$ nix derivation show nixpkgs#hello | jq '.[] | .name = 5' | nix derivation add
error: [json.exception.type_error.302] type must be string, but is object

$ nix derivation show nixpkgs#hello | jq '.[] | .outputs = { out: "/nix/store/8j3f8j-hello" }' | nix derivation add
error: [json.exception.type_error.302] type must be object, but is string

```

*After:*

```
$ echo 4 | nix derivation add
error: Expected JSON of derivation to be of type 'object', but it is of type 'number'

$ nix derivation show nixpkgs#hello | nix derivation add
error: Expected JSON object to contain key 'name' but it doesn't

$ nix derivation show nixpkgs#hello | jq '.[] | .name = 5' | nix derivation add
error: Expected JSON value to be of type 'string' but it is of type 'number'

$ nix derivation show nixpkgs#hello | jq '.[] | .outputs = { out: "/nix/store/8j3f8j-hello" }' | nix derivation add
error:
       … while reading key 'outputs'

       error: Expected JSON value to be of type 'object' but it is of type 'string'
```
This commit is contained in:
Felix Uhl 2023-07-28 22:23:56 +02:00
parent dcdd5fed74
commit 3fefc2b284
4 changed files with 76 additions and 12 deletions
Download patch file Download diff file Expand all files Collapse all files

40
src/libstore/derivations.cc
View file

@ -993,6 +993,7 @@ DerivationOutput DerivationOutput::fromJSON(
const ExperimentalFeatureSettings & xpSettings)
{
std::set<std::string_view> keys;
ensureType(_json, nlohmann::detail::value_t::object);
auto json = (std::map<std::string, nlohmann::json>) _json;
for (const auto & [key, _] : json)
@ -1097,36 +1098,51 @@ Derivation Derivation::fromJSON(
const Store & store,
const nlohmann::json & json)
{
using nlohmann::detail::value_t;
Derivation res;
res.name = json["name"];
ensureType(json, value_t::object);
{
auto & outputsObj = json["outputs"];
res.name = ensureType(valueAt(json, "name"), value_t::string);
try {
auto & outputsObj = ensureType(valueAt(json, "outputs"), value_t::object);
for (auto & [outputName, output] : outputsObj.items()) {
res.outputs.insert_or_assign(
outputName,
DerivationOutput::fromJSON(store, res.name, outputName, output));
}
} catch (Error & e) {
e.addTrace({}, "while reading key 'outputs'");
throw;
}
{
auto & inputsList = json["inputSrcs"];
try {
auto & inputsList = ensureType(valueAt(json, "inputSrcs"), value_t::array);
for (auto & input : inputsList)
res.inputSrcs.insert(store.parseStorePath(static_cast<const std::string &>(input)));
} catch (Error & e) {
e.addTrace({}, "while reading key 'inputSrcs'");
throw;
}
{
auto & inputDrvsObj = json["inputDrvs"];
for (auto & [inputDrvPath, inputOutputs] : inputDrvsObj.items())
try {
auto & inputDrvsObj = ensureType(valueAt(json, "inputDrvs"), value_t::object);
for (auto & [inputDrvPath, inputOutputs] : inputDrvsObj.items()) {
ensureType(inputOutputs, value_t::array);
res.inputDrvs[store.parseStorePath(inputDrvPath)] =
static_cast<const StringSet &>(inputOutputs);
}
} catch (Error & e) {
e.addTrace({}, "while reading key 'inputDrvs'");
throw;
}
res.platform = json["system"];
res.builder = json["builder"];
res.args = json["args"];
res.env = json["env"];
res.platform = ensureType(valueAt(json, "system"), value_t::string);
res.builder = ensureType(valueAt(json, "builder"), value_t::string);
res.args = ensureType(valueAt(json, "args"), value_t::array);
res.env = ensureType(valueAt(json, "env"), value_t::object);
return res;
}