165 lines
6.1 KiB
C++
165 lines
6.1 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 "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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Path manifestFile = userEnv + "/manifest.nix";
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if (pathExists(manifestFile)) {
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Value v;
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state.evalFile(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 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 (i.queryDrvPath() != "")
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drvsToBuild.push_back({state.store->parseStorePath(i.queryDrvPath())});
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debug(format("building user environment dependencies"));
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state.store->buildPaths(drvsToBuild, 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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unsigned int 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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Path drvPath = keepDerivations ? i.queryDrvPath() : "";
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DrvInfo::Outputs outputs = i.queryOutputs(true);
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StringSet metaNames = i.queryMetaNames();
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Value & v(*state.allocValue());
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manifest.listElems()[n++] = &v;
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state.mkAttrs(v, 7 + outputs.size());
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mkString(*state.allocAttr(v, state.sType), "derivation");
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mkString(*state.allocAttr(v, state.sName), i.queryName());
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auto system = i.querySystem();
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if (!system.empty())
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mkString(*state.allocAttr(v, state.sSystem), system);
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mkString(*state.allocAttr(v, state.sOutPath), i.queryOutPath());
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if (drvPath != "")
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mkString(*state.allocAttr(v, state.sDrvPath), i.queryDrvPath());
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// Copy each output meant for installation.
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Value & vOutputs = *state.allocAttr(v, state.sOutputs);
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state.mkList(vOutputs, outputs.size());
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unsigned int m = 0;
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for (auto & j : outputs) {
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mkString(*(vOutputs.listElems()[m++] = state.allocValue()), j.first);
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Value & vOutputs = *state.allocAttr(v, state.symbols.create(j.first));
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state.mkAttrs(vOutputs, 2);
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mkString(*state.allocAttr(vOutputs, state.sOutPath), j.second);
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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(state.store->parseStorePath(j.second));
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state.store->ensurePath(state.store->parseStorePath(j.second));
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references.insert(state.store->parseStorePath(j.second));
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}
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// Copy the meta attributes.
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Value & vMeta = *state.allocAttr(v, state.sMeta);
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state.mkAttrs(vMeta, 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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vMeta.attrs->push_back(Attr(state.symbols.create(j), v));
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}
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vMeta.attrs->sort();
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v.attrs->sort();
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if (drvPath != "") references.insert(state.store->parseStorePath(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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auto manifestFile = state.store->addTextToStore("env-manifest.nix",
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fmt("%s", manifest), 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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, "/"), 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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Value args, topLevel;
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state.mkAttrs(args, 3);
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mkString(*state.allocAttr(args, state.symbols.create("manifest")),
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state.store->printStorePath(manifestFile), {state.store->printStorePath(manifestFile)});
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args.attrs->push_back(Attr(state.symbols.create("derivations"), &manifest));
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args.attrs->sort();
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mkApp(topLevel, envBuilder, args);
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/* Evaluate it. */
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debug("evaluating user environment builder");
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state.forceValue(topLevel);
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PathSet context;
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Attr & aDrvPath(*topLevel.attrs->find(state.sDrvPath));
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auto topLevelDrv = state.store->parseStorePath(state.coerceToPath(aDrvPath.pos ? *(aDrvPath.pos) : noPos, *(aDrvPath.value), context));
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Attr & aOutPath(*topLevel.attrs->find(state.sOutPath));
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Path topLevelOut = state.coerceToPath(aOutPath.pos ? *(aOutPath.pos) : noPos, *(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(topLevelDrvs, 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(format("switching to new user environment"));
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Path generation = createGeneration(ref<LocalFSStore>(store2), profile,
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store2->parseStorePath(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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