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Add constant ‘nixPath’

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It contains the Nix expression search path as a list of { prefix, path
} sets, e.g.

  [ { path = "/nix/var/nix/profiles/per-user/root/channels/nixos"; prefix = ""; }
    { path = "/etc/nixos/configuration.nix"; prefix = "nixos-config"; }
    { path = "/home/eelco/Dev/nix/inst/share/nix/corepkgs"; prefix = "nix"; }
  ]
This commit is contained in:
Eelco Dolstra 2014-05-26 14:55:47 +02:00
parent c273c15cb1
commit a8edf185a9
3 changed files with 20 additions and 2 deletions
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11
src/libexpr/primops.cc
View file

@ -1352,6 +1352,17 @@ void EvalState::createBaseEnv()
evalFile(path, v);
addConstant("derivation", v);
/* Add a value containing the current Nix expression search path. */
mkList(v, searchPath.size());
int n = 0;
for (auto & i : searchPath) {
Value * v2 = v.list.elems[n++] = allocValue();
mkAttrs(*v2, 2);
mkString(*allocAttr(*v2, symbols.create("path")), i.second);
mkString(*allocAttr(*v2, symbols.create("prefix")), i.first);
}
addConstant("nixPath", v);
/* Now that we've added all primops, sort the `builtins' set,
because attribute lookups expect it to be sorted. */
baseEnv.values[0]->attrs->sort();