415 lines
11 KiB
C++
415 lines
11 KiB
C++
#include "globals.hh"
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#include "normalise.hh"
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#include "shared.hh"
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#include "parser.hh"
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#include "eval.hh"
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typedef void (* Operation) (EvalState & state,
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Strings opFlags, Strings opArgs);
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struct DrvInfo
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{
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string name;
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Path drvPath;
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Path outPath;
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Hash drvHash;
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};
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typedef map<Path, DrvInfo> DrvInfos;
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bool parseDerivation(EvalState & state, Expr e, DrvInfo & drv)
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{
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ATMatcher m;
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e = evalExpr(state, e);
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if (!(atMatch(m, e) >> "Attrs")) return false;
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Expr a = queryAttr(e, "type");
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if (!a || evalString(state, a) != "derivation") return false;
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a = queryAttr(e, "name");
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if (!a) throw badTerm("derivation name missing", e);
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drv.name = evalString(state, a);
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a = queryAttr(e, "drvPath");
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if (!a) throw badTerm("derivation path missing", e);
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drv.drvPath = evalPath(state, a);
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a = queryAttr(e, "drvHash");
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if (!a) throw badTerm("derivation hash missing", e);
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drv.drvHash = parseHash(evalString(state, a));
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a = queryAttr(e, "outPath");
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if (!a) throw badTerm("output path missing", e);
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drv.outPath = evalPath(state, a);
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return true;
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}
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bool parseDerivations(EvalState & state, Expr e, DrvInfos & drvs)
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{
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ATMatcher m;
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ATermList es;
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e = evalExpr(state, e);
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if (atMatch(m, e) >> "Attrs") {
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ATermMap drvMap;
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queryAllAttrs(e, drvMap);
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for (ATermIterator i(drvMap.keys()); i; ++i) {
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DrvInfo drv;
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debug(format("evaluating attribute `%1%'") % *i);
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if (parseDerivation(state, drvMap.get(*i), drv))
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drvs[drv.drvPath] = drv;
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}
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}
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else if (atMatch(m, e) >> "List" >> es) {
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for (ATermIterator i(es); i; ++i) {
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DrvInfo drv;
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debug(format("evaluating list element"));
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if (parseDerivation(state, *i, drv))
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drvs[drv.drvPath] = drv;
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}
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}
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return true;
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}
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void loadDerivations(EvalState & state, Path nePath, DrvInfos & drvs)
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{
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Expr e = parseExprFromFile(absPath(nePath));
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if (!parseDerivations(state, e, drvs))
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throw badTerm("expected set of derivations", e);
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}
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static Path getLinksDir()
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{
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return canonPath(nixStateDir + "/links");
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}
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static Path getCurrentPath()
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{
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return getLinksDir() + "/current";
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}
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void queryInstalled(EvalState & state, DrvInfos & drvs)
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{
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Path path = getCurrentPath() + "/manifest";
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if (!pathExists(path)) return; /* not an error, assume nothing installed */
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Expr e = ATreadFromNamedFile(path.c_str());
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if (!e) throw Error(format("cannot read Nix expression from `%1%'") % path);
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if (!parseDerivations(state, e, drvs))
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throw badTerm(format("expected set of derivations in `%1%'") % path, e);
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}
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Path createLink(Path outPath, Path drvPath)
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{
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Path linksDir = getLinksDir();
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unsigned int num = 0;
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Strings names = readDirectory(linksDir);
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for (Strings::iterator i = names.begin(); i != names.end(); ++i) {
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istringstream s(*i);
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unsigned int n;
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if (s >> n && s.eof() && n >= num) num = n + 1;
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}
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Path linkPath;
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while (1) {
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linkPath = (format("%1%/%2%") % linksDir % num).str();
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if (symlink(outPath.c_str(), linkPath.c_str()) == 0) break;
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if (errno != EEXIST)
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throw SysError(format("creating symlink `%1%'") % linkPath);
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/* Somebody beat us to it, retry with a higher number. */
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num++;
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}
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writeStringToFile(linkPath + "-src.id", drvPath);
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return linkPath;
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}
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void switchLink(Path link, Path target)
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{
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Path tmp = canonPath(dirOf(link) + "/.new_" + baseNameOf(link));
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if (symlink(target.c_str(), tmp.c_str()) != 0)
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throw SysError(format("creating symlink `%1%'") % tmp);
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/* The rename() system call is supposed to be essentially atomic
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on Unix. That is, if we have links `current -> X' and
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`new_current -> Y', and we rename new_current to current, a
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process accessing current will see X or Y, but never a
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file-not-found or other error condition. This is sufficient to
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atomically switch user environments. */
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if (rename(tmp.c_str(), link.c_str()) != 0)
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throw SysError(format("renaming `%1%' to `%2%'") % tmp % link);
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}
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void createUserEnv(EvalState & state, const DrvInfos & drvs)
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{
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/* Get the environment builder expression. */
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Expr envBuilder = parseExprFromFile("/home/eelco/nix/corepkgs/buildenv"); /* !!! */
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/* Construct the whole top level derivation. */
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ATermList inputs = ATempty;
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for (DrvInfos::const_iterator i = drvs.begin();
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i != drvs.end(); ++i)
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{
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ATerm t = ATmake(
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"Attrs(["
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"Bind(\"type\", Str(\"derivation\")), "
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"Bind(\"name\", Str(<str>)), "
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"Bind(\"drvPath\", Path(<str>)), "
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"Bind(\"drvHash\", Str(<str>)), "
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"Bind(\"outPath\", Path(<str>))"
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"])",
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i->second.name.c_str(),
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i->second.drvPath.c_str(),
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((string) i->second.drvHash).c_str(),
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i->second.outPath.c_str());
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inputs = ATinsert(inputs, t);
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}
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ATerm inputs2 = ATmake("List(<term>)", ATreverse(inputs));
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/* Also write a copy of the list of inputs to the store; we need
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it for future modifications of the environment. */
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Path inputsFile = writeTerm(inputs2, "-env-inputs");
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Expr topLevel = ATmake(
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"Call(<term>, Attrs(["
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"Bind(\"system\", Str(<str>)), "
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"Bind(\"derivations\", <term>), " // !!! redundant
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"Bind(\"manifest\", Path(<str>))"
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"]))",
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envBuilder, thisSystem.c_str(), inputs2, inputsFile.c_str());
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/* Instantiate it. */
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debug(format("evaluating builder expression `%1%'") % topLevel);
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DrvInfo topLevelDrv;
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if (!parseDerivation(state, topLevel, topLevelDrv))
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abort();
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/* Realise the resulting store expression. */
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debug(format("realising user environment"));
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Path nfPath = normaliseStoreExpr(topLevelDrv.drvPath);
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realiseClosure(nfPath);
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/* Switch the current user environment to the output path. */
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debug(format("switching to new user environment"));
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Path linkPath = createLink(topLevelDrv.outPath, topLevelDrv.drvPath);
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switchLink(getLinksDir() + "/current", linkPath);
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}
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typedef map<string, Path> NameMap;
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NameMap mapByNames(DrvInfos & drvs)
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{
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NameMap nameMap;
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for (DrvInfos::iterator i = drvs.begin(); i != drvs.end(); ++i)
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nameMap[i->second.name] = i->first;
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return nameMap;
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}
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void installDerivations(EvalState & state,
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Path nePath, Strings drvNames)
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{
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debug(format("installing derivations from `%1%'") % nePath);
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/* Fetch all derivations from the input file. */
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DrvInfos availDrvs;
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loadDerivations(state, nePath, availDrvs);
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NameMap nameMap = mapByNames(availDrvs);
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/* Filter out the ones we're not interested in. */
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DrvInfos selectedDrvs;
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for (Strings::iterator i = drvNames.begin();
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i != drvNames.end(); ++i)
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{
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NameMap::iterator j = nameMap.find(*i);
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if (j == nameMap.end())
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throw Error(format("unknown derivation `%1%'") % *i);
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else
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selectedDrvs[j->second] = availDrvs[j->second];
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}
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/* Add in the already installed derivations. */
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DrvInfos installedDrvs;
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queryInstalled(state, installedDrvs);
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selectedDrvs.insert(installedDrvs.begin(), installedDrvs.end());
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createUserEnv(state, selectedDrvs);
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}
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static void opInstall(EvalState & state,
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Strings opFlags, Strings opArgs)
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{
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if (opArgs.size() < 1) throw UsageError("Nix file expected");
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Path nePath = opArgs.front();
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opArgs.pop_front();
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installDerivations(state, nePath,
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Strings(opArgs.begin(), opArgs.end()));
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}
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void uninstallDerivations(EvalState & state, Strings drvNames)
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{
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DrvInfos installedDrvs;
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queryInstalled(state, installedDrvs);
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NameMap nameMap = mapByNames(installedDrvs);
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for (Strings::iterator i = drvNames.begin();
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i != drvNames.end(); ++i)
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{
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NameMap::iterator j = nameMap.find(*i);
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if (j == nameMap.end())
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throw Error(format("unknown derivation `%1%'") % *i);
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else
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installedDrvs.erase(j->second);
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}
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createUserEnv(state, installedDrvs);
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}
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static void opUninstall(EvalState & state,
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Strings opFlags, Strings opArgs)
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{
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uninstallDerivations(state, opArgs);
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}
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static void opQuery(EvalState & state,
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Strings opFlags, Strings opArgs)
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{
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enum { qName, qDrvPath, qStatus } query = qName;
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enum { sInstalled, sAvailable } source = sInstalled;
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for (Strings::iterator i = opFlags.begin();
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i != opFlags.end(); ++i)
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if (*i == "--name") query = qName;
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else if (*i == "--expr" || *i == "-e") query = qDrvPath;
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else if (*i == "--status" || *i == "-s") query = qStatus;
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else if (*i == "--installed") source = sInstalled;
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else if (*i == "--available" || *i == "-f") source = sAvailable;
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else throw UsageError(format("unknown flag `%1%'") % *i);
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/* Obtain derivation information from the specified source. */
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DrvInfos drvs;
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switch (source) {
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case sInstalled:
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queryInstalled(state, drvs);
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break;
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case sAvailable: {
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if (opArgs.size() < 1) throw UsageError("Nix file expected");
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Path nePath = opArgs.front();
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opArgs.pop_front();
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loadDerivations(state, nePath, drvs);
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break;
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}
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default: abort();
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}
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if (opArgs.size() != 0) throw UsageError("no arguments expected");
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/* Perform the specified query on the derivations. */
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switch (query) {
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case qName: {
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for (DrvInfos::iterator i = drvs.begin(); i != drvs.end(); ++i)
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cout << format("%1%\n") % i->second.name;
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break;
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}
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case qDrvPath: {
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for (DrvInfos::iterator i = drvs.begin(); i != drvs.end(); ++i)
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cout << format("%1%\n") % i->second.drvPath;
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break;
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}
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case qStatus: {
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DrvInfos installed;
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queryInstalled(state, installed);
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for (DrvInfos::iterator i = drvs.begin(); i != drvs.end(); ++i) {
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cout << format("%1%%2% %3%\n")
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% (installed.find(i->first) != installed.end() ? 'I' : '-')
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% (isValidPath(i->second.outPath) ? 'P' : '-')
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% i->second.name;
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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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void run(Strings args)
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{
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EvalState state;
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Strings opFlags, opArgs;
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Operation op = 0;
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for (Strings::iterator i = args.begin(); i != args.end(); ++i) {
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string arg = *i;
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Operation oldOp = op;
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if (arg == "--install" || arg == "-i")
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op = opInstall;
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else if (arg == "--uninstall" || arg == "-u")
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op = opUninstall;
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else if (arg == "--query" || arg == "-q")
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op = opQuery;
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else if (arg == "--verbose" || arg == "-v")
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verbosity = (Verbosity) ((int) verbosity + 1);
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else if (arg[0] == '-')
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opFlags.push_back(arg);
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else
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opArgs.push_back(arg);
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if (oldOp && oldOp != op)
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throw UsageError("only one operation may be specified");
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}
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if (!op) throw UsageError("no operation specified");
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openDB();
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op(state, opFlags, opArgs);
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printEvalStats(state);
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}
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string programId = "nix-env";
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