forked from lix-project/lix
262 lines
7.6 KiB
C++
262 lines
7.6 KiB
C++
#include "util.hh"
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#include "get-drvs.hh"
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#include "derivations.hh"
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#include "store-api.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 "parser.hh"
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#include "profiles.hh"
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namespace nix {
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static void readLegacyManifest(const Path & path, DrvInfos & elems);
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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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Path manifestFile = userEnv + "/manifest.nix";
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Path oldManifestFile = userEnv + "/manifest";
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if (pathExists(manifestFile)) {
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Value v;
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state.eval(parseExprFromFile(state, manifestFile), v);
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Bindings bindings;
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getDerivations(state, v, "", bindings, elems);
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} else if (pathExists(oldManifestFile))
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readLegacyManifest(oldManifestFile, elems);
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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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PathSet drvsToBuild;
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foreach (DrvInfos::const_iterator, i, elems)
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if (i->queryDrvPath(state) != "")
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drvsToBuild.insert(i->queryDrvPath(state));
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debug(format("building user environment dependencies"));
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store->buildDerivations(drvsToBuild);
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/* Construct the whole top level derivation. */
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PathSet 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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foreach (DrvInfos::iterator, i, elems) {
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/* Create a pseudo-derivation containing the name, system,
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output path, and optionally the derivation path, as well as
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the meta attributes. */
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Path drvPath = keepDerivations ? i->queryDrvPath(state) : "";
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Value & v(*state.allocValue());
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manifest.list.elems[n++] = &v;
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state.mkAttrs(v, 8);
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mkString(*state.allocAttr(v, state.sType), "derivation");
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mkString(*state.allocAttr(v, state.sName), i->name);
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mkString(*state.allocAttr(v, state.sSystem), i->system);
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mkString(*state.allocAttr(v, state.sOutPath), i->queryOutPath(state));
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if (drvPath != "")
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mkString(*state.allocAttr(v, state.sDrvPath), i->queryDrvPath(state));
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Value & vMeta = *state.allocAttr(v, state.sMeta);
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state.mkAttrs(vMeta, 16);
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MetaInfo meta = i->queryMetaInfo(state);
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foreach (MetaInfo::const_iterator, j, meta) {
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Value & v2(*state.allocAttr(vMeta, state.symbols.create(j->first)));
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switch (j->second.type) {
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case MetaValue::tpInt: mkInt(v2, j->second.intValue); break;
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case MetaValue::tpString: mkString(v2, j->second.stringValue); break;
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case MetaValue::tpStrings: {
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state.mkList(v2, j->second.stringValues.size());
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unsigned int m = 0;
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foreach (Strings::const_iterator, k, j->second.stringValues) {
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v2.list.elems[m] = state.allocValue();
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mkString(*v2.list.elems[m++], *k);
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}
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break;
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}
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default: abort();
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}
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}
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vMeta.attrs->sort();
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v.attrs->sort();
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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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store->addTempRoot(i->queryOutPath(state));
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store->ensurePath(i->queryOutPath(state));
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references.insert(i->queryOutPath(state));
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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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Path manifestFile = store->addTextToStore("env-manifest.nix",
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(format("%1%") % manifest).str(), references);
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/* Get the environment builder expression. */
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Value envBuilder;
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state.eval(parseExprFromFile(state, nixDataDir + "/nix/corepkgs/buildenv"), 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.sSystem), thisSystem);
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mkString(*state.allocAttr(args, state.symbols.create("manifest")),
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manifestFile, singleton<PathSet>(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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DrvInfo topLevelDrv;
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if (!getDerivation(state, topLevel, topLevelDrv))
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abort();
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/* Realise the resulting store expression. */
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debug("building user environment");
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store->buildDerivations(singleton<PathSet>(topLevelDrv.queryDrvPath(state)));
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/* Switch the current user environment to the output path. */
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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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printMsg(lvlError, format("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(profile, topLevelDrv.queryOutPath(state));
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switchLink(profile, generation);
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return true;
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}
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/* Code for parsing manifests in the old textual ATerm format. */
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static string parseStr(std::istream & str)
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{
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expect(str, "Str(");
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string s = parseString(str);
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expect(str, ",[])");
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return s;
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}
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static string parseWord(std::istream & str)
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{
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string res;
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while (isalpha(str.peek()))
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res += str.get();
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return res;
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}
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static MetaInfo parseMeta(std::istream & str)
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{
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MetaInfo meta;
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expect(str, "Attrs([");
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while (!endOfList(str)) {
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expect(str, "Bind(");
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MetaValue value;
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string name = parseString(str);
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expect(str, ",");
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string type = parseWord(str);
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if (type == "Str") {
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expect(str, "(");
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value.type = MetaValue::tpString;
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value.stringValue = parseString(str);
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expect(str, ",[])");
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}
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else if (type == "List") {
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expect(str, "([");
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value.type = MetaValue::tpStrings;
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while (!endOfList(str))
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value.stringValues.push_back(parseStr(str));
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expect(str, ")");
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}
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else throw Error(format("unexpected token `%1%'") % type);
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expect(str, ",NoPos)");
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meta[name] = value;
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}
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expect(str, ")");
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return meta;
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}
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static void readLegacyManifest(const Path & path, DrvInfos & elems)
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{
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string manifest = readFile(path);
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std::istringstream str(manifest);
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expect(str, "List([");
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unsigned int n = 0;
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while (!endOfList(str)) {
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DrvInfo elem;
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expect(str, "Attrs([");
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while (!endOfList(str)) {
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expect(str, "Bind(");
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string name = parseString(str);
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expect(str, ",");
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if (name == "meta") elem.setMetaInfo(parseMeta(str));
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else {
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string value = parseStr(str);
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if (name == "name") elem.name = value;
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else if (name == "outPath") elem.setOutPath(value);
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else if (name == "drvPath") elem.setDrvPath(value);
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else if (name == "system") elem.system = value;
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}
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expect(str, ",NoPos)");
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}
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expect(str, ")");
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if (elem.name != "") {
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elem.attrPath = int2String(n++);
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elems.push_back(elem);
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}
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}
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expect(str, ")");
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}
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}
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