36 lines
1.8 KiB
Markdown
36 lines
1.8 KiB
Markdown
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# versionCheckHook {#versioncheckhook}
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This hook adds a `versionCheckPhase` to the [`preInstallCheckHooks`](#ssec-installCheck-phase) that runs the main program of the derivation with a `--help` or `--version` argument, and checks that the `${version}` string is found in that output. You use it like this:
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```nix
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{
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lib,
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stdenv,
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versionCheckHook,
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# ...
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}:
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stdenv.mkDerivation (finalAttrs: {
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# ...
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nativeInstallCheckInputs = [
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versionCheckHook
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];
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doInstallCheck = true;
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# ...
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})
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```
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Note that for [`buildPythonPackage`](#buildpythonpackage-function) and [`buildPythonApplication`](#buildpythonapplication-function), `doInstallCheck` is enabled by default.
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It does so in a clean environment (using `env --ignore-environment`), and it checks for the `${version}` string in both the `stdout` and the `stderr` of the command. It will report to you in the build log the output it received and it will fail the build if it failed to find `${version}`.
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The variables that this phase control are:
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- `dontVersionCheck`: Disable adding this hook to the [`preInstallCheckHooks`](#ssec-installCheck-phase). Useful if you do want to load the bash functions of the hook, but run them differently.
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- `versionCheckProgram`: The full path to the program that should print the `${version}` string. Defaults roughly to `${placeholder "out"}/bin/${pname}`. Using `$out` in the value of this variable won't work, as environment variables from this variable are not expanded by the hook. Hence using `placeholder` is unavoidable.
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- `versionCheckProgramArg`: The argument that needs to be passed to `versionCheckProgram`. If undefined the hook tries first `--help` and then `--version`. Examples: `version`, `-V`, `-v`.
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- `preVersionCheck`: A hook to run before the check is done.
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- `postVersionCheck`: A hook to run after the check is done.
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