forked from lix-project/lix
343 lines
9.7 KiB
C++
343 lines
9.7 KiB
C++
#include "command.hh"
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#include "attr-path.hh"
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#include "common-eval-args.hh"
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#include "derivations.hh"
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#include "eval-inline.hh"
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#include "eval.hh"
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#include "get-drvs.hh"
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#include "store-api.hh"
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#include "shared.hh"
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#include <regex>
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namespace nix {
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SourceExprCommand::SourceExprCommand()
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{
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mkFlag()
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.shortName('f')
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.longName("file")
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.label("file")
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.description("evaluate a set of attributes from FILE (deprecated)")
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.dest(&file);
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}
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ref<EvalState> SourceExprCommand::getEvalState()
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{
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if (!evalState)
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evalState = std::make_shared<EvalState>(searchPath, getStore());
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return ref<EvalState>(evalState);
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}
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Buildable Installable::toBuildable()
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{
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auto buildables = toBuildables();
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if (buildables.size() != 1)
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throw Error("installable '%s' evaluates to %d derivations, where only one is expected", what(), buildables.size());
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return std::move(buildables[0]);
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}
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struct InstallableStorePath : Installable
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{
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Path storePath;
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InstallableStorePath(const Path & storePath) : storePath(storePath) { }
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std::string what() override { return storePath; }
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Buildables toBuildables() override
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{
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return {{isDerivation(storePath) ? storePath : "", {{"out", storePath}}}};
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}
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};
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struct InstallableValue : Installable
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{
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SourceExprCommand & cmd;
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InstallableValue(SourceExprCommand & cmd) : cmd(cmd) { }
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Buildables toBuildables() override
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{
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auto state = cmd.getEvalState();
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auto v = toValue(*state);
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Bindings & autoArgs = *cmd.getAutoArgs(*state);
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DrvInfos drvs;
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getDerivations(*state, *v, "", autoArgs, drvs, false);
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Buildables res;
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PathSet drvPaths;
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for (auto & drv : drvs) {
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Buildable b{drv.queryDrvPath()};
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drvPaths.insert(b.drvPath);
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auto outputName = drv.queryOutputName();
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if (outputName == "")
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throw Error("derivation '%s' lacks an 'outputName' attribute", b.drvPath);
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b.outputs.emplace(outputName, drv.queryOutPath());
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res.push_back(std::move(b));
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}
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// Hack to recognize .all: if all drvs have the same drvPath,
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// merge the buildables.
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if (drvPaths.size() == 1) {
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Buildable b{*drvPaths.begin()};
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for (auto & b2 : res)
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b.outputs.insert(b2.outputs.begin(), b2.outputs.end());
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return {b};
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} else
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return res;
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}
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};
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struct InstallableExpr : InstallableValue
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{
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std::string text;
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InstallableExpr(SourceExprCommand & cmd, const std::string & text)
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: InstallableValue(cmd), text(text) { }
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std::string what() override { return text; }
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Value * toValue(EvalState & state) override
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{
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auto v = state.allocValue();
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state.eval(state.parseExprFromString(text, absPath(".")), *v);
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return v;
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}
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};
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struct InstallableAttrPath : InstallableValue
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{
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Value * v;
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std::string attrPath;
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InstallableAttrPath(SourceExprCommand & cmd, Value * v, const std::string & attrPath)
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: InstallableValue(cmd), v(v), attrPath(attrPath)
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{ }
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std::string what() override { return attrPath; }
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Value * toValue(EvalState & state) override
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{
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auto vRes = findAlongAttrPath(state, attrPath, *cmd.getAutoArgs(state), *v);
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state.forceValue(*vRes);
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return vRes;
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}
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};
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struct InstallableFlake : InstallableValue
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{
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FlakeRef flakeRef;
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std::string attrPath;
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InstallableFlake(SourceExprCommand & cmd, FlakeRef && flakeRef, const std::string & attrPath)
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: InstallableValue(cmd), flakeRef(flakeRef), attrPath(attrPath)
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{ }
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std::string what() override { return flakeRef.to_string() + ":" + attrPath; }
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Value * toValue(EvalState & state) override
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{
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auto vFlake = state.allocValue();
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makeFlakeValue(state, flakeRef, true, *vFlake);
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auto vProvides = (*vFlake->attrs->get(state.symbols.create("provides")))->value;
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state.forceValue(*vProvides);
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auto emptyArgs = state.allocBindings(0);
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if (auto aPackages = *vProvides->attrs->get(state.symbols.create("packages"))) {
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try {
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auto * v = findAlongAttrPath(state, attrPath, *emptyArgs, *aPackages->value);
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state.forceValue(*v);
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return v;
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} catch (AttrPathNotFound & e) {
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}
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}
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auto * v = findAlongAttrPath(state, attrPath, *emptyArgs, *vProvides);
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state.forceValue(*v);
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return v;
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}
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std::optional<std::string> installableToFlakeUri() override
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{
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if (std::get_if<FlakeRef::IsPath>(&flakeRef.data))
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return flakeRef.to_string();
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else
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return std::nullopt;
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}
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};
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// FIXME: extend
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std::string attrRegex = R"([A-Za-z_][A-Za-z0-9-_+]*)";
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static std::regex attrPathRegex(fmt(R"(%1%(\.%1%)*)", attrRegex));
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std::vector<std::shared_ptr<Installable>> SourceExprCommand::parseInstallables(
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ref<Store> store, std::vector<std::string> ss)
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{
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std::vector<std::shared_ptr<Installable>> result;
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if (file) {
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// FIXME: backward compatibility hack
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evalSettings.pureEval = false;
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auto state = getEvalState();
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auto vFile = state->allocValue();
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state->evalFile(lookupFileArg(*state, *file), *vFile);
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if (ss.empty())
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ss = {""};
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for (auto & s : ss)
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result.push_back(std::make_shared<InstallableAttrPath>(*this, vFile, s));
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} else {
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for (auto & s : ss) {
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size_t colon;
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if (s.compare(0, 1, "(") == 0)
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result.push_back(std::make_shared<InstallableExpr>(*this, s));
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else if (hasPrefix(s, "nixpkgs.")) {
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bool static warned;
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warnOnce(warned, "the syntax 'nixpkgs.<attr>' is deprecated; use 'nixpkgs:<attr>' instead");
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result.push_back(std::make_shared<InstallableFlake>(*this, FlakeRef("nixpkgs"), std::string(s, 8)));
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}
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else if ((colon = s.rfind(':')) != std::string::npos) {
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auto flakeRef = std::string(s, 0, colon);
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auto attrPath = std::string(s, colon + 1);
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result.push_back(std::make_shared<InstallableFlake>(*this, FlakeRef(flakeRef, true), attrPath));
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}
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else if (s.find('/') != std::string::npos || s == ".") {
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Path storePath;
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try {
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storePath = store->toStorePath(store->followLinksToStore(s));
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} catch (Error) { }
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if (storePath != "")
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result.push_back(std::make_shared<InstallableStorePath>(storePath));
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else
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result.push_back(std::make_shared<InstallableFlake>(*this, FlakeRef(s, true), "defaultPackage"));
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}
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else
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result.push_back(std::make_shared<InstallableFlake>(*this, FlakeRef("nixpkgs"), s));
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}
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}
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return result;
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}
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std::shared_ptr<Installable> SourceExprCommand::parseInstallable(
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ref<Store> store, const std::string & installable)
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{
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auto installables = parseInstallables(store, {installable});
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assert(installables.size() == 1);
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return installables.front();
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}
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Buildables build(ref<Store> store, RealiseMode mode,
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std::vector<std::shared_ptr<Installable>> installables)
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{
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if (mode != Build)
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settings.readOnlyMode = true;
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Buildables buildables;
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PathSet pathsToBuild;
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for (auto & i : installables) {
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for (auto & b : i->toBuildables()) {
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if (b.drvPath != "") {
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StringSet outputNames;
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for (auto & output : b.outputs)
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outputNames.insert(output.first);
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pathsToBuild.insert(
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b.drvPath + "!" + concatStringsSep(",", outputNames));
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} else
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for (auto & output : b.outputs)
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pathsToBuild.insert(output.second);
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buildables.push_back(std::move(b));
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}
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}
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if (mode == DryRun)
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printMissing(store, pathsToBuild, lvlError);
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else if (mode == Build)
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store->buildPaths(pathsToBuild);
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return buildables;
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}
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PathSet toStorePaths(ref<Store> store, RealiseMode mode,
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std::vector<std::shared_ptr<Installable>> installables)
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{
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PathSet outPaths;
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for (auto & b : build(store, mode, installables))
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for (auto & output : b.outputs)
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outPaths.insert(output.second);
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return outPaths;
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}
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Path toStorePath(ref<Store> store, RealiseMode mode,
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std::shared_ptr<Installable> installable)
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{
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auto paths = toStorePaths(store, mode, {installable});
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if (paths.size() != 1)
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throw Error("argument '%s' should evaluate to one store path", installable->what());
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return *paths.begin();
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}
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PathSet toDerivations(ref<Store> store,
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std::vector<std::shared_ptr<Installable>> installables, bool useDeriver)
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{
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PathSet drvPaths;
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for (auto & i : installables)
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for (auto & b : i->toBuildables()) {
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if (b.drvPath.empty()) {
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if (!useDeriver)
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throw Error("argument '%s' did not evaluate to a derivation", i->what());
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for (auto & output : b.outputs) {
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auto derivers = store->queryValidDerivers(output.second);
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if (derivers.empty())
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throw Error("'%s' does not have a known deriver", i->what());
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// FIXME: use all derivers?
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drvPaths.insert(*derivers.begin());
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}
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} else
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drvPaths.insert(b.drvPath);
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}
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return drvPaths;
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}
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void InstallablesCommand::prepare()
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{
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installables = parseInstallables(getStore(), _installables);
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}
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void InstallableCommand::prepare()
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{
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installable = parseInstallable(getStore(), _installable);
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}
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}
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