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pathExists: isDir when endswith /

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Fixes https://github.com/NixOS/nix/issues/8838
This commit is contained in:
Robert Hensing 2023-08-25 17:18:37 +02:00
parent d2e6cfa075
commit 1e08e12d81
2 changed files with 14 additions and 3 deletions
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16
src/libexpr/primops.cc
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@ -1520,15 +1520,25 @@ static RegisterPrimOp primop_storePath({
static void prim_pathExists(EvalState & state, const PosIdx pos, Value * * args, Value & v) static void prim_pathExists(EvalState & state, const PosIdx pos, Value * * args, Value & v)
{ {
auto & arg = *args[0];
/* We don’t check the path right now, because we don’t want to /* We don’t check the path right now, because we don’t want to
throw if the path isn’t allowed, but just return false (and we throw if the path isn’t allowed, but just return false (and we
can’t just catch the exception here because we still want to can’t just catch the exception here because we still want to
throw if something in the evaluation of `*args[0]` tries to throw if something in the evaluation of `arg` tries to
access an unauthorized path). */ access an unauthorized path). */
auto path = realisePath(state, pos, *args[0], { .checkForPureEval = false }); auto path = realisePath(state, pos, arg, { .checkForPureEval = false });
/* SourcePath doesn't know about trailing slash. */
auto mustBeDir = arg.type() == nString && arg.str().ends_with("/");
try { try {
v.mkBool(state.checkSourcePath(path).pathExists()); auto checked = state.checkSourcePath(path);
auto exists = checked.pathExists();
if (exists && mustBeDir) {
exists = checked.lstat().type == InputAccessor::tDirectory;
}
v.mkBool(exists);
} catch (SysError & e) { } catch (SysError & e) {
/* Don't give away info from errors while canonicalising /* Don't give away info from errors while canonicalising
‘path’ in restricted mode. */ ‘path’ in restricted mode. */

1
tests/lang/eval-okay-pathexists.nix
View file

@ -1,6 +1,7 @@
builtins.pathExists (./lib.nix) builtins.pathExists (./lib.nix)
&& builtins.pathExists (builtins.toPath ./lib.nix) && builtins.pathExists (builtins.toPath ./lib.nix)
&& builtins.pathExists (builtins.toString ./lib.nix) && builtins.pathExists (builtins.toString ./lib.nix)
&& !builtins.pathExists (builtins.toString ./lib.nix + "/")
&& builtins.pathExists (builtins.toPath (builtins.toString ./lib.nix)) && builtins.pathExists (builtins.toPath (builtins.toString ./lib.nix))
&& !builtins.pathExists (builtins.toPath (builtins.toString ./bla.nix)) && !builtins.pathExists (builtins.toPath (builtins.toString ./bla.nix))
&& builtins.pathExists ./lib.nix && builtins.pathExists ./lib.nix