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README: recommend overriding env over mkShell

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Resolve #186.

The current documentation shows how to include dev-dependencies in
environment *or* add external dependencies to the environment, but I
suspect in the vast majority of cases both will be desired.
This commit is contained in:
ryneeverett 2021-09-27 12:48:29 -04:00
parent 2df09faeff
commit cd659414ca
1 changed files with 4 additions and 5 deletions
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9
README.md
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@ -110,7 +110,7 @@ in myAppEnv.env
```
#### Example shell.nix with external dependencies
For a shell environment including external dependencies, pass the app environment and dependency packages (for example, `pkgs.hello`) as build inputs to `pkgs.mkShell`.
For a shell environment including external dependencies, override the `env` to add dependency packages (for example, `pkgs.hello`) as build inputs.
```nix
{ pkgs ? import <nixpkgs> {} }:
let
@ -120,10 +120,9 @@ let
my-app = ./src;
};
};
in
pkgs.mkShell {
buildInputs = [ myAppEnv pkgs.hello ];
}
in myAppEnv.env.overrideAttrs (oldAttrs: {
buildInputs = [ pkgs.hello ]:
})
```
### mkPoetryPackages