forked from lix-project/lix
91dc023665
Whenever Nix attempts to realise a derivation for which a closure is already known, but this closure cannot be realised, fall back on normalising the derivation. The most common scenario in which this is useful is when we have registered substitutes in order to perform binary distribution from, say, a network repository. If the repository is down, the realisation of the derivation will fail. When this option is specified, Nix will build the derivation instead. Thus, binary installation falls back on a source installation. This option is not the default since it is generally not desirable for a transient failure in obtaining the substitutes to lead to a full build from source (with the related consumption of resources).
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 = realiseStoreExpr(topLevelDrv.drvPath);
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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";
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switchLink(profileLink, profile);
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}
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|
|
|
|
|
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";
|