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Add experimental-features setting

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Experimental features are now opt-in. There is currently one
experimental feature: "nix-command" (which enables the "nix"
command. This will allow us to merge experimental features more
quickly, without committing to supporting them indefinitely.

Typical usage:

$ nix build --experimental-features 'nix-command flakes' nixpkgs#hello

(cherry picked from commit 8e478c2341,
without the "flakes" feature)
This commit is contained in:
Eelco Dolstra 2019-10-16 17:45:09 +02:00
parent 389a2cebed
commit aabf5c86c9
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4 changed files with 15 additions and 0 deletions
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7
src/libstore/globals.cc
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@ -105,6 +105,13 @@ StringSet Settings::getDefaultSystemFeatures()
return features;
}
void Settings::requireExperimentalFeature(const std::string & name)
{
auto & f = experimentalFeatures.get();
if (std::find(f.begin(), f.end(), name) == f.end())
throw Error("experimental Nix feature '%s' is disabled", name);
}
const string nixVersion = PACKAGE_VERSION;
template<> void BaseSetting<SandboxMode>::set(const std::string & str)