Check requiredSystemFeatures for local builds
For example, this prevents a "kvm" build on machines that don't have KVM. Fixes #2012.
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@ -757,6 +757,33 @@ password <replaceable>my-password</replaceable>
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</varlistentry>
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<varlistentry xml:id="conf-system-features"><term><literal>system-features</literal></term>
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<listitem><para>A set of system “features” supported by this
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machine, e.g. <literal>kvm</literal>. Derivations can express a
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dependency on such features through the derivation attribute
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<varname>requiredSystemFeatures</varname>. For example, the
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attribute
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<programlisting>
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requiredSystemFeatures = [ "kvm" ];
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</programlisting>
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ensures that the derivation can only be built on a machine with
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the <literal>kvm</literal> feature.</para>
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<para>This setting by default includes <literal>kvm</literal> if
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<filename>/dev/kvm</filename> is accessible, and the
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pseudo-features <literal>nixos-test</literal>,
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<literal>benchmark</literal> and <literal>big-parallel</literal>
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that are used in Nixpkgs to route builds to specific
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machines.</para>
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</listitem>
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</varlistentry>
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<varlistentry xml:id="conf-timeout"><term><literal>timeout</literal></term>
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<listitem>
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@ -12,6 +12,7 @@
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</partintro>
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-->
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<xi:include href="rl-2.2.xml" />
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<xi:include href="rl-2.1.xml" />
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<xi:include href="rl-2.0.xml" />
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<xi:include href="rl-1.11.10.xml" />
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@ -1646,18 +1646,13 @@ HookReply DerivationGoal::tryBuildHook()
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try {
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/* Tell the hook about system features (beyond the system type)
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required from the build machine. (The hook could parse the
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drv file itself, but this is easier.) */
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auto features = parsedDrv->getStringsAttr("requiredSystemFeatures").value_or(Strings());
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/* Send the request to the hook. */
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worker.hook->sink
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<< "try"
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<< (worker.getNrLocalBuilds() < settings.maxBuildJobs ? 1 : 0)
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<< drv->platform
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<< drvPath
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<< features;
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<< parsedDrv->getRequiredSystemFeatures();
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worker.hook->sink.flush();
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/* Read the first line of input, which should be a word indicating
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@ -1797,11 +1792,13 @@ static void preloadNSS() {
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void DerivationGoal::startBuilder()
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{
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/* Right platform? */
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if (!parsedDrv->canBuildLocally()) {
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throw Error(
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format("a '%1%' is required to build '%3%', but I am a '%2%'")
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% drv->platform % settings.thisSystem % drvPath);
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}
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if (!parsedDrv->canBuildLocally())
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throw Error("a '%s' with features {%s} is required to build '%s', but I am a '%s' with features {%s}",
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drv->platform,
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concatStringsSep(", ", parsedDrv->getRequiredSystemFeatures()),
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drvPath,
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settings.thisSystem,
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concatStringsSep(", ", settings.systemFeatures));
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if (drv->isBuiltin())
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preloadNSS();
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@ -2625,7 +2622,7 @@ void DerivationGoal::runChild()
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createDirs(chrootRootDir + "/dev/shm");
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createDirs(chrootRootDir + "/dev/pts");
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ss.push_back("/dev/full");
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if (pathExists("/dev/kvm"))
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if (settings.systemFeatures.get().count("kvm") && pathExists("/dev/kvm"))
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ss.push_back("/dev/kvm");
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ss.push_back("/dev/null");
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ss.push_back("/dev/random");
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@ -86,6 +86,21 @@ unsigned int Settings::getDefaultCores()
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return std::max(1U, std::thread::hardware_concurrency());
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}
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StringSet Settings::getDefaultSystemFeatures()
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{
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/* For backwards compatibility, accept some "features" that are
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used in Nixpkgs to route builds to certain machines but don't
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actually require anything special on the machines. */
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StringSet features{"nixos-test", "benchmark", "big-parallel"};
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#if __linux__
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if (access("/dev/kvm", R_OK | W_OK) == 0)
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features.insert("kvm");
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#endif
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return features;
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}
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const string nixVersion = PACKAGE_VERSION;
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template<> void BaseSetting<SandboxMode>::set(const std::string & str)
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@ -32,6 +32,8 @@ class Settings : public Config {
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unsigned int getDefaultCores();
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StringSet getDefaultSystemFeatures();
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public:
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Settings();
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@ -261,6 +263,10 @@ public:
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"These may be supported natively (e.g. armv7 on some aarch64 CPUs "
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"or using hacks like qemu-user."};
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Setting<StringSet> systemFeatures{this, getDefaultSystemFeatures(),
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"system-features",
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"Optional features that this system implements (like \"kvm\")."};
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Setting<Strings> substituters{this,
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nixStore == "/nix/store" ? Strings{"https://cache.nixos.org/"} : Strings(),
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"substituters",
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@ -82,11 +82,25 @@ std::experimental::optional<Strings> ParsedDerivation::getStringsAttr(const std:
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}
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}
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StringSet ParsedDerivation::getRequiredSystemFeatures() const
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{
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StringSet res;
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for (auto & i : getStringsAttr("requiredSystemFeatures").value_or(Strings()))
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res.insert(i);
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return res;
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}
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bool ParsedDerivation::canBuildLocally() const
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{
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return drv.platform == settings.thisSystem
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|| settings.extraPlatforms.get().count(drv.platform) > 0
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|| drv.isBuiltin();
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if (drv.platform != settings.thisSystem.get()
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&& !settings.extraPlatforms.get().count(drv.platform)
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&& !drv.isBuiltin())
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return false;
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for (auto & feature : getRequiredSystemFeatures())
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if (!settings.systemFeatures.get().count(feature)) return false;
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return true;
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}
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bool ParsedDerivation::willBuildLocally() const
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@ -25,6 +25,8 @@ public:
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std::experimental::optional<Strings> getStringsAttr(const std::string & name) const;
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StringSet getRequiredSystemFeatures() const;
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bool canBuildLocally() const;
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bool willBuildLocally() const;
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@ -11,7 +11,8 @@ rm -rf $TEST_ROOT/store0 $TEST_ROOT/store1
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nix build -f build-hook.nix -o $TEST_ROOT/result --max-jobs 0 \
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--sandbox-paths /nix/store --sandbox-build-dir /build-tmp \
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--builders "$TEST_ROOT/store0; $TEST_ROOT/store1 - - 1 1 foo"
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--builders "$TEST_ROOT/store0; $TEST_ROOT/store1 - - 1 1 foo" \
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--system-features foo
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outPath=$TEST_ROOT/result
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