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doc: change allowInsecurePredicate example to a useful one
(cherry picked from commit 73b6567c41
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@ -154,11 +154,13 @@ There are several ways to tweak how Nix handles a package which has been marked
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The `allowInsecurePredicate` option is a function which accepts a package and returns a boolean, much like `allowUnfreePredicate`.
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The following configuration example only allows insecure packages with very short names:
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The following configuration example allows any version of the `ovftool` package:
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```nix
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{
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allowInsecurePredicate = pkg: builtins.stringLength (lib.getName pkg) <= 5;
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allowInsecurePredicate = pkg: builtins.elem (lib.getName pkg) [
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"ovftool"
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];
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}
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```
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