forked from lix-project/lix
112ee89501
* A better substitute mechanism. Instead of generating a store expression for each store path for which we have a substitute, we can have a single store expression that builds a generic program that is invoked to build the desired store path, which is passed as an argument. This means that operations like `nix-pull' only produce O(1) files instead of O(N) files in the store when registering N substitutes. (It consumes O(N) database storage, of course, but that's not a performance problem). * Added a test for the substitute mechanism. * `nix-store --substitute' reads the substitutes from standard input, instead of from the command line. This prevents us from running into the kernel's limit on command line length.
708 lines
20 KiB
C++
708 lines
20 KiB
C++
#include "profiles.hh"
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#include "names.hh"
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#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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#include "help.txt.hh"
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#include <cerrno>
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#include <ctime>
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struct Globals
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{
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Path profile;
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Path nixExprPath;
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EvalState state;
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bool dryRun;
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};
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typedef void (* Operation) (Globals & globals,
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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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typedef vector<DrvInfo> DrvInfoList;
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void printHelp()
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{
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cout << string((char *) helpText, sizeof helpText);
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}
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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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DrvInfo drv;
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e = evalExpr(state, e);
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if (parseDerivation(state, e, drv))
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drvs[drv.drvPath] = drv;
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else 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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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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else
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parseDerivations(state, drvMap.get(*i), drvs);
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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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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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else
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parseDerivations(state, *i, drvs);
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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(state, absPath(nePath));
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if (!parseDerivations(state, e, drvs))
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throw Error("set of derivations expected");
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}
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static Path getHomeDir()
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{
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Path homeDir(getEnv("HOME", ""));
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if (homeDir == "") throw Error("HOME environment variable not set");
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return homeDir;
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}
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static Path getDefNixExprPath()
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{
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return getHomeDir() + "/.nix-defexpr";
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}
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struct AddPos : TermFun
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{
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ATerm operator () (ATerm e)
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{
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ATMatcher m;
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ATerm x, y, z;
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if (atMatch(m, e) >> "Bind" >> x >> y >> z)
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return e;
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if (atMatch(m, e) >> "Bind" >> x >> y)
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return ATmake("Bind(<term>, <term>, NoPos)", x, y);
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return e;
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}
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};
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void queryInstalled(EvalState & state, DrvInfos & drvs,
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const Path & userEnv)
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{
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Path path = userEnv + "/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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/* Compatibility: Bind(x, y) -> Bind(x, y, NoPos). */
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AddPos addPos;
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e = bottomupRewrite(addPos, e);
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if (!parseDerivations(state, e, drvs))
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throw badTerm(format("set of derivations expected in `%1%'") % path, e);
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}
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void createUserEnv(EvalState & state, const DrvInfos & drvs,
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const Path & profile)
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{
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/* Get the environment builder expression. */
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Expr envBuilder = parseExprFromFile(state,
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nixDataDir + "/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\"), NoPos), "
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"Bind(\"name\", Str(<str>), NoPos), "
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"Bind(\"drvPath\", Path(<str>), NoPos), "
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"Bind(\"drvHash\", Str(<str>), NoPos), "
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"Bind(\"outPath\", Path(<str>), NoPos)"
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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>), NoPos), "
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"Bind(\"derivations\", <term>, NoPos), " // !!! redundant
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"Bind(\"manifest\", Path(<str>), NoPos)"
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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 generation = createGeneration(profile,
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topLevelDrv.outPath, topLevelDrv.drvPath, nfPath);
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switchLink(profile, generation);
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}
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static void installDerivations(EvalState & state,
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Path nePath, DrvNames & selectors, const Path & profile,
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bool dryRun)
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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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/* Filter out the ones we're not interested in. */
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DrvInfos selectedDrvs;
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for (DrvInfos::iterator i = availDrvs.begin();
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i != availDrvs.end(); ++i)
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{
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DrvName drvName(i->second.name);
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for (DrvNames::iterator j = selectors.begin();
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j != selectors.end(); ++j)
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{
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if (j->matches(drvName)) {
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printMsg(lvlInfo,
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format("installing `%1%'") % i->second.name);
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j->hits++;
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selectedDrvs.insert(*i);
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}
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}
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}
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/* Check that all selectors have been used. */
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for (DrvNames::iterator i = selectors.begin();
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i != selectors.end(); ++i)
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if (i->hits == 0)
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throw Error(format("selector `%1%' matches no derivations")
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% i->fullName);
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/* Add in the already installed derivations. */
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DrvInfos installedDrvs;
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queryInstalled(state, installedDrvs, profile);
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selectedDrvs.insert(installedDrvs.begin(), installedDrvs.end());
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if (dryRun) return;
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createUserEnv(state, selectedDrvs, profile);
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}
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static void opInstall(Globals & globals,
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Strings opFlags, Strings opArgs)
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{
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if (opFlags.size() > 0)
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throw UsageError(format("unknown flags `%1%'") % opFlags.front());
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DrvNames drvNames = drvNamesFromArgs(opArgs);
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installDerivations(globals.state, globals.nixExprPath,
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drvNames, globals.profile, globals.dryRun);
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}
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typedef enum { utLt, utLeq, utAlways } UpgradeType;
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static void upgradeDerivations(EvalState & state,
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Path nePath, DrvNames & selectors, const Path & profile,
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UpgradeType upgradeType, bool dryRun)
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{
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debug(format("upgrading derivations from `%1%'") % nePath);
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/* Upgrade works as follows: we take all currently installed
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derivations, and for any derivation matching any selector, look
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for a derivation in the input Nix expression that has the same
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name and a higher version number. */
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/* Load the currently installed derivations. */
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DrvInfos installedDrvs;
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queryInstalled(state, installedDrvs, profile);
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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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/* Go through all installed derivations. */
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DrvInfos newDrvs;
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for (DrvInfos::iterator i = installedDrvs.begin();
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i != installedDrvs.end(); ++i)
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{
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DrvName drvName(i->second.name);
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/* Do we want to upgrade this derivation? */
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bool upgrade = false;
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for (DrvNames::iterator j = selectors.begin();
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j != selectors.end(); ++j)
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{
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if (j->matches(drvName)) {
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j->hits++;
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upgrade = true;
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break;
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}
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}
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if (!upgrade) {
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newDrvs.insert(*i);
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continue;
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}
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/* If yes, find the derivation in the input Nix expression
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with the same name and satisfying the version constraints
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specified by upgradeType. If there are multiple matches,
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take the one with highest version. */
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DrvInfos::iterator bestDrv = availDrvs.end();
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DrvName bestName;
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for (DrvInfos::iterator j = availDrvs.begin();
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j != availDrvs.end(); ++j)
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{
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DrvName newName(j->second.name);
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if (newName.name == drvName.name) {
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int d = compareVersions(drvName.version, newName.version);
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if (upgradeType == utLt && d < 0 ||
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upgradeType == utLeq && d <= 0 ||
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upgradeType == utAlways)
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{
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if (bestDrv == availDrvs.end() ||
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compareVersions(
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bestName.version, newName.version) < 0)
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{
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bestDrv = j;
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bestName = newName;
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}
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}
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}
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}
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if (bestDrv != availDrvs.end() &&
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i->second.drvPath != bestDrv->second.drvPath)
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{
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printMsg(lvlInfo,
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format("upgrading `%1%' to `%2%'")
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% i->second.name % bestDrv->second.name);
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newDrvs.insert(*bestDrv);
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} else newDrvs.insert(*i);
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}
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if (dryRun) return;
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createUserEnv(state, newDrvs, profile);
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}
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static void opUpgrade(Globals & globals,
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Strings opFlags, Strings opArgs)
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{
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UpgradeType upgradeType = utLt;
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for (Strings::iterator i = opFlags.begin();
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i != opFlags.end(); ++i)
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if (*i == "--lt") upgradeType = utLt;
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else if (*i == "--leq") upgradeType = utLeq;
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else if (*i == "--always") upgradeType = utAlways;
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else throw UsageError(format("unknown flag `%1%'") % *i);
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DrvNames drvNames = drvNamesFromArgs(opArgs);
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upgradeDerivations(globals.state, globals.nixExprPath,
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drvNames, globals.profile, upgradeType, globals.dryRun);
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}
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static void uninstallDerivations(EvalState & state, DrvNames & selectors,
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Path & profile, bool dryRun)
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{
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DrvInfos installedDrvs;
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queryInstalled(state, installedDrvs, profile);
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for (DrvInfos::iterator i = installedDrvs.begin();
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i != installedDrvs.end(); ++i)
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{
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DrvName drvName(i->second.name);
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for (DrvNames::iterator j = selectors.begin();
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j != selectors.end(); ++j)
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if (j->matches(drvName)) {
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printMsg(lvlInfo,
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format("uninstalling `%1%'") % i->second.name);
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installedDrvs.erase(i);
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}
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}
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if (dryRun) return;
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createUserEnv(state, installedDrvs, profile);
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}
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static void opUninstall(Globals & globals,
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Strings opFlags, Strings opArgs)
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{
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if (opFlags.size() > 0)
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throw UsageError(format("unknown flags `%1%'") % opFlags.front());
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DrvNames drvNames = drvNamesFromArgs(opArgs);
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uninstallDerivations(globals.state, drvNames,
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globals.profile, globals.dryRun);
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}
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static bool cmpDrvByName(const DrvInfo & a, const DrvInfo & b)
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{
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return a.name < b.name;
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}
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static void opQuery(Globals & globals,
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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") 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 == "-a") 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(globals.state, drvs, globals.profile);
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break;
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case sAvailable: {
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loadDerivations(globals.state, globals.nixExprPath, 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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/* Sort them by name. */
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DrvInfoList drvs2;
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for (DrvInfos::iterator i = drvs.begin(); i != drvs.end(); ++i)
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drvs2.push_back(i->second);
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sort(drvs2.begin(), drvs2.end(), cmpDrvByName);
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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 (DrvInfoList::iterator i = drvs2.begin(); i != drvs2.end(); ++i)
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cout << format("%1%\n") % i->name;
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break;
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}
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case qDrvPath: {
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for (DrvInfoList::iterator i = drvs2.begin(); i != drvs2.end(); ++i)
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cout << format("%1%\n") % i->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(globals.state, installed, globals.profile);
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PathSet installedPaths; /* output paths of installed drvs */
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for (DrvInfos::iterator i = installed.begin();
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i != installed.end(); ++i)
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installedPaths.insert(i->second.outPath);
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for (DrvInfoList::iterator i = drvs2.begin(); i != drvs2.end(); ++i) {
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Substitutes subs = querySubstitutes(i->drvPath);
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cout << format("%1%%2%%3% %4%\n")
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% (installedPaths.find(i->outPath)
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!= installedPaths.end() ? 'I' : '-')
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% (isValidPath(i->outPath) ? 'P' : '-')
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% (subs.size() > 0 ? 'S' : '-')
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% i->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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static void opSwitchProfile(Globals & globals,
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Strings opFlags, Strings opArgs)
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{
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if (opFlags.size() > 0)
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throw UsageError(format("unknown flag `%1%'") % opFlags.front());
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if (opArgs.size() != 1)
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throw UsageError(format("exactly one argument expected"));
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Path profile = opArgs.front();
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Path profileLink = getHomeDir() + "/.nix-profile";
|
|
|
|
switchLink(profileLink, profile);
|
|
}
|
|
|
|
|
|
static const int prevGen = -2;
|
|
|
|
|
|
static void switchGeneration(Globals & globals, int dstGen)
|
|
{
|
|
int curGen;
|
|
Generations gens = findGenerations(globals.profile, curGen);
|
|
|
|
Generation dst;
|
|
for (Generations::iterator i = gens.begin(); i != gens.end(); ++i)
|
|
if ((dstGen == prevGen && i->number < curGen) ||
|
|
(dstGen >= 0 && i->number == dstGen))
|
|
dst = *i;
|
|
|
|
if (!dst)
|
|
if (dstGen == prevGen)
|
|
throw Error(format("no generation older than the current (%1%) exists")
|
|
% curGen);
|
|
else
|
|
throw Error(format("generation %1% does not exist") % dstGen);
|
|
|
|
printMsg(lvlInfo, format("switching from generation %1% to %2%")
|
|
% curGen % dst.number);
|
|
|
|
if (globals.dryRun) return;
|
|
|
|
switchLink(globals.profile, dst.path);
|
|
}
|
|
|
|
|
|
static void opSwitchGeneration(Globals & globals,
|
|
Strings opFlags, Strings opArgs)
|
|
{
|
|
if (opFlags.size() > 0)
|
|
throw UsageError(format("unknown flag `%1%'") % opFlags.front());
|
|
if (opArgs.size() != 1)
|
|
throw UsageError(format("exactly one argument expected"));
|
|
|
|
istringstream str(opArgs.front());
|
|
int dstGen;
|
|
str >> dstGen;
|
|
if (!str || !str.eof())
|
|
throw UsageError(format("expected a generation number"));
|
|
|
|
switchGeneration(globals, dstGen);
|
|
}
|
|
|
|
|
|
static void opRollback(Globals & globals,
|
|
Strings opFlags, Strings opArgs)
|
|
{
|
|
if (opFlags.size() > 0)
|
|
throw UsageError(format("unknown flag `%1%'") % opFlags.front());
|
|
if (opArgs.size() != 0)
|
|
throw UsageError(format("no arguments expected"));
|
|
|
|
switchGeneration(globals, prevGen);
|
|
}
|
|
|
|
|
|
static void opListGenerations(Globals & globals,
|
|
Strings opFlags, Strings opArgs)
|
|
{
|
|
if (opFlags.size() > 0)
|
|
throw UsageError(format("unknown flag `%1%'") % opFlags.front());
|
|
if (opArgs.size() != 0)
|
|
throw UsageError(format("no arguments expected"));
|
|
|
|
int curGen;
|
|
Generations gens = findGenerations(globals.profile, curGen);
|
|
|
|
for (Generations::iterator i = gens.begin(); i != gens.end(); ++i) {
|
|
tm t;
|
|
if (!localtime_r(&i->creationTime, &t)) throw Error("cannot convert time");
|
|
cout << format("%|4| %|4|-%|02|-%|02| %|02|:%|02|:%|02| %||\n")
|
|
% i->number
|
|
% (t.tm_year + 1900) % (t.tm_mon + 1) % t.tm_mday
|
|
% t.tm_hour % t.tm_min % t.tm_sec
|
|
% (i->number == curGen ? "(current)" : "");
|
|
}
|
|
}
|
|
|
|
|
|
static void opDefaultExpr(Globals & globals,
|
|
Strings opFlags, Strings opArgs)
|
|
{
|
|
if (opFlags.size() > 0)
|
|
throw UsageError(format("unknown flags `%1%'") % opFlags.front());
|
|
if (opArgs.size() != 1)
|
|
throw UsageError(format("exactly one argument expected"));
|
|
|
|
Path defNixExpr = absPath(opArgs.front());
|
|
Path defNixExprLink = getDefNixExprPath();
|
|
|
|
switchLink(defNixExprLink, defNixExpr);
|
|
}
|
|
|
|
|
|
void run(Strings args)
|
|
{
|
|
/* Use a higher default verbosity (lvlInfo). */
|
|
verbosity = (Verbosity) ((int) verbosity + 1);
|
|
|
|
Strings opFlags, opArgs;
|
|
Operation op = 0;
|
|
|
|
Globals globals;
|
|
globals.nixExprPath = getDefNixExprPath();
|
|
globals.dryRun = false;
|
|
|
|
for (Strings::iterator i = args.begin(); i != args.end(); ++i) {
|
|
string arg = *i;
|
|
|
|
Operation oldOp = op;
|
|
|
|
if (arg == "--install" || arg == "-i")
|
|
op = opInstall;
|
|
else if (arg == "--uninstall" || arg == "-e")
|
|
op = opUninstall;
|
|
else if (arg == "--upgrade" || arg == "-u")
|
|
op = opUpgrade;
|
|
else if (arg == "--query" || arg == "-q")
|
|
op = opQuery;
|
|
else if (arg == "--import" || arg == "-I") /* !!! bad name */
|
|
op = opDefaultExpr;
|
|
else if (arg == "--profile" || arg == "-p") {
|
|
++i;
|
|
if (i == args.end()) throw UsageError(
|
|
format("`%1%' requires an argument") % arg);
|
|
globals.profile = absPath(*i);
|
|
}
|
|
else if (arg == "--file" || arg == "-f") {
|
|
++i;
|
|
if (i == args.end()) throw UsageError(
|
|
format("`%1%' requires an argument") % arg);
|
|
globals.nixExprPath = absPath(*i);
|
|
}
|
|
else if (arg == "--switch-profile" || arg == "-S")
|
|
op = opSwitchProfile;
|
|
else if (arg == "--switch-generation" || arg == "-G")
|
|
op = opSwitchGeneration;
|
|
else if (arg == "--rollback")
|
|
op = opRollback;
|
|
else if (arg == "--list-generations")
|
|
op = opListGenerations;
|
|
else if (arg == "--dry-run") {
|
|
printMsg(lvlInfo, "(dry run; not doing anything)");
|
|
globals.dryRun = true;
|
|
}
|
|
else if (arg[0] == '-')
|
|
opFlags.push_back(arg);
|
|
else
|
|
opArgs.push_back(arg);
|
|
|
|
if (oldOp && oldOp != op)
|
|
throw UsageError("only one operation may be specified");
|
|
}
|
|
|
|
if (!op) throw UsageError("no operation specified");
|
|
|
|
if (globals.profile == "") {
|
|
Path profileLink = getHomeDir() + "/.nix-profile";
|
|
globals.profile = pathExists(profileLink)
|
|
? absPath(readLink(profileLink), dirOf(profileLink))
|
|
: canonPath(nixStateDir + "/profiles/default");
|
|
}
|
|
|
|
openDB();
|
|
|
|
op(globals, opFlags, opArgs);
|
|
|
|
printEvalStats(globals.state);
|
|
}
|
|
|
|
|
|
string programId = "nix-env";
|