lix/doc/manual
Felix Uhl 3fefc2b284 Fix derivation load assertion errors
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'
```
2023-08-05 01:34:30 +02:00
..
src Fix derivation load assertion errors 2023-08-05 01:34:30 +02:00
theme doc/manual: don't need to copy highlight.js manually 2021-08-04 19:47:05 -07:00
anchors.jq doc: Port anchors preprocessor to jq script 2022-05-26 18:17:21 +02:00
book.toml manual: Check links 2023-01-10 22:30:41 +01:00
custom.css disallow selecting shell prompt in code samples 2022-12-05 11:01:46 +01:00
generate-builtin-constants.nix revert anchor prefix for builtin constants 2023-07-20 10:27:38 +02:00
generate-builtins.nix Automatically document builtin constants 2023-06-27 09:37:54 -04:00
generate-manpage.nix doc rendering: add functions to scope explicitly (#7378) 2023-05-03 07:16:29 +00:00
generate-xp-features-shortlist.nix Single page for experimental feature descriptions 2023-04-09 11:01:23 -04:00
generate-xp-features.nix Single page for experimental feature descriptions 2023-04-09 11:01:23 -04:00
local.mk Automatically document builtin constants 2023-06-27 09:37:54 -04:00
quote-literals.xsl Generate release notes again 2014-03-12 14:24:29 +01:00
redirects.js fix broken links 2023-07-19 11:01:48 +02:00
utils.nix Mark experimental configuration settings programmatically 2023-04-16 10:58:04 -04:00