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Merge pull request #3012 from basvandijk/fix-pathExists

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Allow builtins.pathExists to check the existence of /nix/store paths
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Eelco Dolstra 2019-07-30 11:33:37 +02:00 committed by GitHub
commit 7680357ccc
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2 changed files with 12 additions and 3 deletions
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10
src/libexpr/primops.cc
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@ -832,8 +832,14 @@ static void prim_pathExists(EvalState & state, const Pos & pos, Value * * args,
{
PathSet context;
Path path = state.coerceToPath(pos, *args[0], context);
if (!context.empty())
throw EvalError(format("string '%1%' cannot refer to other paths, at %2%") % path % pos);
try {
state.realiseContext(context);
} catch (InvalidPathError & e) {
throw EvalError(format(
"cannot check the existence of '%1%', since path '%2%' is not valid, at %3%")
% path % e.path % pos);
}
try {
mkBool(v, pathExists(state.checkSourcePath(path)));
} catch (SysError & e) {

5
tests/import-derivation.nix
View file

@ -10,7 +10,10 @@ let
'';
};
value = import bar;
value =
# Test that pathExists can check the existence of /nix/store paths
assert builtins.pathExists bar;
import bar;
in