From 3bd7fa3bb4e950dcb256fff3c923dbea7d1fb349 Mon Sep 17 00:00:00 2001
From: Brian McKenna <brian@brianmckenna.org>
Date: Tue, 12 Nov 2024 20:47:31 +1100
Subject: [PATCH] local-store: fix infinite loop on Windows

Also switch to std::filesystem.
---
 src/libstore/local-store.cc | 11 +++++------
 1 file changed, 5 insertions(+), 6 deletions(-)

diff --git a/src/libstore/local-store.cc b/src/libstore/local-store.cc
index eafdac0cd33..f9529178697 100644
--- a/src/libstore/local-store.cc
+++ b/src/libstore/local-store.cc
@@ -212,16 +212,15 @@ LocalStore::LocalStore(
 
     /* Ensure that the store and its parents are not symlinks. */
     if (!settings.allowSymlinkedStore) {
-        Path path = realStoreDir;
-        struct stat st;
-        while (path != "/") {
-            st = lstat(path);
-            if (S_ISLNK(st.st_mode))
+        std::filesystem::path path = realStoreDir.get();
+        std::filesystem::path root = path.root_path();
+        while (path != root) {
+            if (std::filesystem::is_symlink(path))
                 throw Error(
                         "the path '%1%' is a symlink; "
                         "this is not allowed for the Nix store and its parent directories",
                         path);
-            path = dirOf(path);
+            path = path.parent_path();
         }
     }