From 9a20bf56203bbe20d1e456f9d3050d94790b2833 Mon Sep 17 00:00:00 2001
From: Eelco Dolstra <edolstra@gmail.com>
Date: Thu, 15 Jan 2026 14:46:57 +0100
Subject: [PATCH] Path fetcher: Handle invalid paths

This is especially important when using a chroot store and `path:...`
refers to the host store.
---
 src/libfetchers/path.cc | 12 +++++++-----
 1 file changed, 7 insertions(+), 5 deletions(-)

diff --git a/src/libfetchers/path.cc b/src/libfetchers/path.cc
index 8f9ccd19132a..b75f7053e3ef 100644
--- a/src/libfetchers/path.cc
+++ b/src/libfetchers/path.cc
@@ -156,11 +156,13 @@ struct PathInputScheme : InputScheme
 
             // To prevent `fetchToStore()` copying the path again to Nix
             // store, pre-create an entry in the fetcher cache.
-            auto info = store.queryPathInfo(*storePath);
-            accessor->fingerprint = fmt("path:%s", info->narHash.to_string(HashFormat::SRI, true));
-            settings.getCache()->upsert(
-                makeSourcePathToHashCacheKey(*accessor->fingerprint, ContentAddressMethod::Raw::NixArchive, "/"),
-                {{"hash", info->narHash.to_string(HashFormat::SRI, true)}});
+            auto info = store.maybeQueryPathInfo(*storePath);
+            if (info) {
+                accessor->fingerprint = fmt("path:%s", info->narHash.to_string(HashFormat::SRI, true));
+                settings.getCache()->upsert(
+                    makeSourcePathToHashCacheKey(*accessor->fingerprint, ContentAddressMethod::Raw::NixArchive, "/"),
+                    {{"hash", info->narHash.to_string(HashFormat::SRI, true)}});
+            }
         }
 
         return {accessor, std::move(input)};