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Add automatic C library input propagation workaround

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Automatically adds Nix C library build inputs based on which nix-bindings
crates are dependencies, working around missing native input propagation
in nix-cargo-integration.

The workaround inspects the dreamLock to detect:
- If the crate being built is a nix-bindings crate (adds its own inputs)
- Direct dependencies on nix-bindings crates (adds their inputs)

The mapping is recursive via lazyAttrsOf, so depending on nix-bindings-flake
automatically brings in transitive C library dependencies.

Downstream consumers can extend the mapping for their own multi-crate
workspaces where crate A depends on crate B which depends on nix-bindings.
This commit is contained in:
Robert Hensing 2026-01-13 15:25:57 +01:00
parent dbb00333b1
commit 6110414520
3 changed files with 156 additions and 66 deletions
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25
flake.nix
View file

@ -28,6 +28,7 @@
}:
{
_file = ./flake.nix;
imports = [ ./input-propagation-workaround.nix ];
options.perSystem = flake-parts-lib.mkPerSystemOption (
{ pkgs, ... }:
{
@ -46,24 +47,20 @@
A module to load into your nix-cargo-integration
[`perSystem.nci.projects.<name>.depsDrvConfig`](https://flake.parts/options/nix-cargo-integration.html#opt-perSystem.nci.projects._name_.depsDrvConfig) or similar such options.
This provides common build configuration (pkg-config, libclang, etc.) but you must
add the specific Nix C libraries your crates need to `buildInputs`:
- `nix-bindings-util-sys` needs `nix-util-c`
- `nix-bindings-store-sys` needs `nix-store-c`
- `nix-bindings-expr-sys` needs `nix-expr-c`
- `nix-bindings-fetchers-sys` needs `nix-fetchers-c` (Nix >= 2.29)
- `nix-bindings-flake-sys` needs `nix-flake-c`
- `nix-bindings-bdwgc-sys` needs `boehmgc`
This provides common build configuration (pkg-config, libclang, etc.) and
automatically adds Nix C library build inputs based on which nix-bindings
crates are *direct* dependencies of your crate.
To disable automatic build input detection:
```nix
nix-bindings-rust.inputPropagationWorkaround.enable = false;
```
Example:
```nix
perSystem = perSystem@{ config, pkgs, ... }: {
nci.projects."my_project".depsDrvConfig = {
perSystem = perSystem@{ config, ... }: {
nci.projects."my_project".drvConfig = {
imports = [ perSystem.config.nix-bindings-rust.nciBuildConfig ];
mkDerivation.buildInputs = [
perSystem.config.nix-bindings-rust.nixPackage.libs.nix-store-c
# ... add other libs as needed
];
};
}
```