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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();

2
tests/lang.sh
View file

@ -46,7 +46,7 @@ for i in lang/eval-okay-*.nix; do
if test -e lang/$i.flags; then
flags=$(cat lang/$i.flags)
fi
if ! NIX_PATH=lang/dir3:lang/dir4_PATH nix-instantiate $flags --eval --strict lang/$i.nix > lang/$i.out; then
if ! NIX_PATH=lang/dir3:lang/dir4 nix-instantiate $flags --eval --strict lang/$i.nix > lang/$i.out; then
echo "FAIL: $i should evaluate"
fail=1
elif ! diff lang/$i.out lang/$i.exp; then

9
tests/lang/eval-okay-search-path.nix
View file

@ -1,3 +1,10 @@
assert builtins.pathExists <nix/buildenv.nix>;
with import ./lib.nix;
with builtins;
assert pathExists <nix/buildenv.nix>;
assert length nixPath == 3;
assert length (filter (x: x.prefix == "nix") nixPath) == 1;
assert length (filter (x: baseNameOf x.path == "dir4") nixPath) == 1;
import <a.nix> + import <b.nix> + import <c.nix> + import <dir5/c.nix>