forked from lix-project/lix
c6120352b3
derivation(s) we're interested, e.g.,
$ nix-instantiate ./all-packages.nix --attr xlibs.libX11
List elements can also be selected:
$ nix-instantiate ./build-for-release.nix --attr 0.subversion
This allows a non-ambiguous specification of a derivation. Of
course, this should also be added to nix-env and nix-build.
122 lines
2.9 KiB
C++
122 lines
2.9 KiB
C++
#include <map>
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#include <iostream>
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#include "globals.hh"
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#include "build.hh"
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#include "gc.hh"
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#include "shared.hh"
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#include "eval.hh"
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#include "parser.hh"
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#include "nixexpr-ast.hh"
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#include "get-drvs.hh"
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#include "help.txt.hh"
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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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static Expr evalStdin(EvalState & state, bool parseOnly)
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{
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startNest(nest, lvlTalkative, format("evaluating standard input"));
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string s, s2;
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while (getline(cin, s2)) s += s2 + "\n";
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Expr e = parseExprFromString(state, s, absPath("."));
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return parseOnly ? e : evalExpr(state, e);
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}
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static Path gcRoot;
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static int rootNr = 0;
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static bool indirectRoot = false;
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static void printResult(EvalState & state, Expr e, bool evalOnly,
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const string & attrPath)
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{
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if (evalOnly)
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cout << format("%1%\n") % e;
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else {
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DrvInfos drvs;
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getDerivations(state, e, drvs, attrPath);
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for (DrvInfos::iterator i = drvs.begin(); i != drvs.end(); ++i) {
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Path drvPath = i->queryDrvPath(state);
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if (gcRoot == "")
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printGCWarning();
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else
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drvPath = addPermRoot(drvPath,
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makeRootName(gcRoot, rootNr),
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indirectRoot);
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cout << format("%1%\n") % drvPath;
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}
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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 files;
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bool readStdin = false;
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bool evalOnly = false;
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bool parseOnly = false;
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string attrPath;
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for (Strings::iterator i = args.begin();
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i != args.end(); )
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{
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string arg = *i++;
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if (arg == "-")
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readStdin = true;
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else if (arg == "--eval-only") {
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readOnlyMode = true;
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evalOnly = true;
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}
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else if (arg == "--parse-only") {
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readOnlyMode = true;
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parseOnly = evalOnly = true;
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}
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else if (arg == "--add-root") {
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if (i == args.end())
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throw UsageError("`--add-root requires an argument");
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gcRoot = absPath(*i++);
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}
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else if (arg == "--attr") {
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if (i == args.end())
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throw UsageError("`--attr requires an argument");
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attrPath = *i++;
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}
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else if (arg == "--indirect")
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indirectRoot = true;
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else if (arg[0] == '-')
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throw UsageError(format("unknown flag `%1%`") % arg);
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else
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files.push_back(arg);
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}
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openDB();
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if (readStdin) {
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Expr e = evalStdin(state, parseOnly);
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printResult(state, e, evalOnly, attrPath);
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}
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for (Strings::iterator i = files.begin();
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i != files.end(); i++)
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{
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Path path = absPath(*i);
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Expr e = parseOnly
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? parseExprFromFile(state, path)
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: evalFile(state, path);
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printResult(state, e, evalOnly, attrPath);
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}
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printEvalStats(state);
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}
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string programId = "nix-instantiate";
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