tests.nixpkgs-check-by-name: Create script to run locally

Due to the check soon depending on the base branch (see `--base`),
the CI check can't reasonably share all code with a local check.
We can still make a script to run it locally, just not sharing all code.

1 files changed, 5 insertions, 6 deletions

diff --git a/pkgs/by-name/README.md b/pkgs/by-name/README.md
index a7cdc57201df..948003bb5573 100644
--- a/pkgs/by-name/README.md
+++ b/pkgs/by-name/README.md
@@ -112,12 +112,11 @@ There's some limitations as to which packages can be defined using this structur
 
 CI performs [certain checks](../test/nixpkgs-check-by-name/README.md#validity-checks) on the `pkgs/by-name` structure.
 This is done using the [`nixpkgs-check-by-name` tool](../test/nixpkgs-check-by-name).
-The version of this tool used is the one that corresponds to the NixOS channel of the PR base branch.
-See [here](../../.github/workflows/check-by-name.yml) for details.
 
-The tool can be run locally using
+You can locally emulate the CI check using
 
-```bash
-nix-build -A tests.nixpkgs-check-by-name
-result/bin/nixpkgs-check-by-name .
 ```
+$ ./pkgs/test/nixpkgs-check-by-name/scripts/run-local.sh master
+```
+
+See [here](../../.github/workflows/check-by-name.yml) for more info.