forked from lix-project/lix
328 lines
9 KiB
C++
328 lines
9 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 FILE rather than the default")
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.dest(&file);
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}
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Value * SourceExprCommand::getSourceExpr(EvalState & state)
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{
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if (vSourceExpr) return vSourceExpr;
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auto sToplevel = state.symbols.create("_toplevel");
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vSourceExpr = state.allocValue();
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if (file != "")
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state.evalFile(lookupFileArg(state, file), *vSourceExpr);
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else {
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/* Construct the installation source from $NIX_PATH. */
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auto searchPath = state.getSearchPath();
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state.mkAttrs(*vSourceExpr, 1024);
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mkBool(*state.allocAttr(*vSourceExpr, sToplevel), true);
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std::unordered_set<std::string> seen;
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auto addEntry = [&](const std::string & name) {
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if (name == "") return;
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if (!seen.insert(name).second) return;
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Value * v1 = state.allocValue();
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mkPrimOpApp(*v1, state.getBuiltin("findFile"), state.getBuiltin("nixPath"));
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Value * v2 = state.allocValue();
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mkApp(*v2, *v1, mkString(*state.allocValue(), name));
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mkApp(*state.allocAttr(*vSourceExpr, state.symbols.create(name)),
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state.getBuiltin("import"), *v2);
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};
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for (auto & i : searchPath)
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/* Hack to handle channels. */
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if (i.first.empty() && pathExists(i.second + "/manifest.nix")) {
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for (auto & j : readDirectory(i.second))
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if (j.name != "manifest.nix"
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&& pathExists(fmt("%s/%s/default.nix", i.second, j.name)))
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addEntry(j.name);
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} else
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addEntry(i.first);
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vSourceExpr->attrs->sort();
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}
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return vSourceExpr;
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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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std::string attrPath;
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InstallableAttrPath(SourceExprCommand & cmd, const std::string & attrPath)
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: InstallableValue(cmd), 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 source = cmd.getSourceExpr(state);
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Bindings & autoArgs = *cmd.getAutoArgs(state);
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Value * v = findAlongAttrPath(state, attrPath, autoArgs, *source);
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state.forceValue(*v);
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return v;
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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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static std::vector<std::shared_ptr<Installable>> parseInstallables(
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SourceExprCommand & cmd, ref<Store> store, std::vector<std::string> ss, bool useDefaultInstallables)
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{
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std::vector<std::shared_ptr<Installable>> result;
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if (ss.empty() && useDefaultInstallables) {
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if (cmd.file == "")
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cmd.file = ".";
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ss = {""};
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}
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for (auto & s : ss) {
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if (s.compare(0, 1, "(") == 0)
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result.push_back(std::make_shared<InstallableExpr>(cmd, s));
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else if (s.find("/") != std::string::npos) {
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auto path = store->toStorePath(store->followLinksToStore(s));
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if (store->isStorePath(path))
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result.push_back(std::make_shared<InstallableStorePath>(path));
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}
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else if (s == "" || std::regex_match(s, attrPathRegex))
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result.push_back(std::make_shared<InstallableAttrPath>(cmd, s));
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else
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throw UsageError("don't know what to do with argument '%s'", s);
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}
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return result;
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}
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std::shared_ptr<Installable> parseInstallable(
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SourceExprCommand & cmd, ref<Store> store, const std::string & installable,
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bool useDefaultInstallables)
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{
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auto installables = parseInstallables(cmd, store, {installable}, false);
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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(*this, getStore(), _installables, useDefaultInstallables());
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}
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void InstallableCommand::prepare()
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{
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installable = parseInstallable(*this, getStore(), _installable, false);
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}
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}
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