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R""(
# Examples
* Evaluate the flake in the current directory, and build its checks:
```console
# nix flake check
```
* Verify that the `patchelf` flake evaluates, but don't build its
checks:
```console
# nix flake check --no-build github:NixOS/patchelf
```
# Description
This command verifies that the flake specified by flake reference
*flake-url* can be evaluated successfully (as detailed below), and
that the derivations specified by the flake's `checks` output can be
built successfully.
# Evaluation checks
The following flake output attributes must be derivations:
* `checks.`*system*`.`*name*
* `defaultPackage.`*system*`
* `devShell.`*system*`
* `nixosConfigurations.`*name*`.config.system.build.toplevel
* `packages.`*system*`.`*name*
The following flake output attributes must be [app
definitions](./nix3-run.md):
* `apps.`*system*`.`*name*
* `defaultApp.`*system*`
The following flake output attributes must be [template
definitions](./nix3-flake-init.md):
* `defaultTemplate`
* `templates`.`*name*
The following flake output attributes must be *Nixpkgs overlays*:
* `overlay`
* `overlays`.`*name*
The following flake output attributes must be *NixOS modules*:
* `nixosModule`
* `nixosModules`.`*name*
The following flake output attributes must be
[bundlers](./nix3-bundle.md):
* `bundlers`.`*name*
* `defaultBundler`
In addition, the `hydraJobs` output is evaluated in the same way as
Hydra's `hydra-eval-jobs` (i.e. as a arbitrarily deeply nested
attribute set of derivations). Similarly, the
`legacyPackages`.*system* output is evaluated like `nix-env -qa`.
)""
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