forked from lix-project/lix
170 lines
6 KiB
C++
170 lines
6 KiB
C++
#include "user-env.hh"
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#include "util.hh"
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#include "derivations.hh"
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#include "store-api.hh"
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#include "path-with-outputs.hh"
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#include "local-fs-store.hh"
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#include "globals.hh"
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#include "shared.hh"
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#include "eval.hh"
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#include "eval-inline.hh"
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#include "profiles.hh"
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namespace nix {
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DrvInfos queryInstalled(EvalState & state, const Path & userEnv)
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{
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DrvInfos elems;
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if (pathExists(userEnv + "/manifest.json"))
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throw Error("profile '%s' is incompatible with 'nix-env'; please use 'nix profile' instead", userEnv);
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auto manifestFile = userEnv + "/manifest.nix";
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if (pathExists(manifestFile)) {
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Value v;
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state.evalFile(state.rootPath(CanonPath(manifestFile)), v);
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Bindings & bindings(*state.allocBindings(0));
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getDerivations(state, v, "", bindings, elems, false);
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}
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return elems;
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}
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bool createUserEnv(EvalState & state, DrvInfos & elems,
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const Path & profile, bool keepDerivations,
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const std::string & lockToken)
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{
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/* Build the components in the user environment, if they don't
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exist already. */
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std::vector<StorePathWithOutputs> drvsToBuild;
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for (auto & i : elems)
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if (auto drvPath = i.queryDrvPath())
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drvsToBuild.push_back({*drvPath});
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debug("building user environment dependencies");
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state.store->buildPaths(
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toDerivedPaths(drvsToBuild),
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state.repair ? bmRepair : bmNormal);
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/* Construct the whole top level derivation. */
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StorePathSet references;
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Value manifest;
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state.mkList(manifest, elems.size());
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size_t n = 0;
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for (auto & i : elems) {
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/* Create a pseudo-derivation containing the name, system,
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output paths, and optionally the derivation path, as well
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as the meta attributes. */
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std::optional<StorePath> drvPath = keepDerivations ? i.queryDrvPath() : std::nullopt;
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DrvInfo::Outputs outputs = i.queryOutputs(true, true);
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StringSet metaNames = i.queryMetaNames();
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auto attrs = state.buildBindings(7 + outputs.size());
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attrs.alloc(state.sType).mkString("derivation");
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attrs.alloc(state.sName).mkString(i.queryName());
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auto system = i.querySystem();
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if (!system.empty())
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attrs.alloc(state.sSystem).mkString(system);
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attrs.alloc(state.sOutPath).mkString(state.store->printStorePath(i.queryOutPath()));
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if (drvPath)
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attrs.alloc(state.sDrvPath).mkString(state.store->printStorePath(*drvPath));
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// Copy each output meant for installation.
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auto & vOutputs = attrs.alloc(state.sOutputs);
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state.mkList(vOutputs, outputs.size());
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for (const auto & [m, j] : enumerate(outputs)) {
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(vOutputs.listElems()[m] = state.allocValue())->mkString(j.first);
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auto outputAttrs = state.buildBindings(2);
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outputAttrs.alloc(state.sOutPath).mkString(state.store->printStorePath(*j.second));
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attrs.alloc(j.first).mkAttrs(outputAttrs);
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/* This is only necessary when installing store paths, e.g.,
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`nix-env -i /nix/store/abcd...-foo'. */
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state.store->addTempRoot(*j.second);
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state.store->ensurePath(*j.second);
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references.insert(*j.second);
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}
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// Copy the meta attributes.
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auto meta = state.buildBindings(metaNames.size());
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for (auto & j : metaNames) {
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Value * v = i.queryMeta(j);
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if (!v) continue;
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meta.insert(state.symbols.create(j), v);
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}
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attrs.alloc(state.sMeta).mkAttrs(meta);
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(manifest.listElems()[n++] = state.allocValue())->mkAttrs(attrs);
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if (drvPath) references.insert(*drvPath);
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}
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/* Also write a copy of the list of user environment elements to
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the store; we need it for future modifications of the
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environment. */
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std::ostringstream str;
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manifest.print(state.symbols, str, true);
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auto manifestFile = state.store->addTextToStore("env-manifest.nix",
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str.str(), references);
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/* Get the environment builder expression. */
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Value envBuilder;
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state.eval(state.parseExprFromString(
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#include "buildenv.nix.gen.hh"
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, state.rootPath(CanonPath::root)), envBuilder);
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/* Construct a Nix expression that calls the user environment
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builder with the manifest as argument. */
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auto attrs = state.buildBindings(3);
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state.mkStorePathString(manifestFile, attrs.alloc("manifest"));
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attrs.insert(state.symbols.create("derivations"), &manifest);
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Value args;
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args.mkAttrs(attrs);
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Value topLevel;
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topLevel.mkApp(&envBuilder, &args);
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/* Evaluate it. */
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debug("evaluating user environment builder");
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state.forceValue(topLevel, [&]() { return topLevel.determinePos(noPos); });
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NixStringContext context;
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Attr & aDrvPath(*topLevel.attrs->find(state.sDrvPath));
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auto topLevelDrv = state.coerceToStorePath(aDrvPath.pos, *aDrvPath.value, context, "");
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Attr & aOutPath(*topLevel.attrs->find(state.sOutPath));
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auto topLevelOut = state.coerceToStorePath(aOutPath.pos, *aOutPath.value, context, "");
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/* Realise the resulting store expression. */
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debug("building user environment");
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std::vector<StorePathWithOutputs> topLevelDrvs;
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topLevelDrvs.push_back({topLevelDrv});
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state.store->buildPaths(
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toDerivedPaths(topLevelDrvs),
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state.repair ? bmRepair : bmNormal);
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/* Switch the current user environment to the output path. */
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auto store2 = state.store.dynamic_pointer_cast<LocalFSStore>();
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if (store2) {
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PathLocks lock;
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lockProfile(lock, profile);
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Path lockTokenCur = optimisticLockProfile(profile);
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if (lockToken != lockTokenCur) {
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printInfo("profile '%1%' changed while we were busy; restarting", profile);
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return false;
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}
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debug("switching to new user environment");
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Path generation = createGeneration(ref<LocalFSStore>(store2), profile, topLevelOut);
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switchLink(profile, generation);
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}
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return true;
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}
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}
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