fix(node): index, serve and write files past Windows' MAX_PATHHEADmain

With the system's default setting (LongPathsEnabled off) every call given
a plain path of 260 characters or more refuses it, so a deep library was
partly invisible: the walk could not list such a directory and its files
never reached the members.

The node now hands each call that touches a group's disk the extended
form (paths.long_path), and keeps the plain path in the index, the hash
cache and the log. A directory is listed under its long form and its
entries named from the plain one (indexer.walk_files, wire._walk_dirs).
Covered: the walk, stats and hashing, reconcile and the watcher, the
folder list members see, serving over WebRTC and QUIC, deletion, uploads
and their recovery, folder creation and removal, audio tags and the
cover beside a track, photos, and a show's episode numbering. ffmpeg
extends a long path itself and keeps the plain one.

long_path now normalises before prefixing (the extended form skips the
system's normalisation) and starts at 248 characters, where creating a
directory is already refused.

test_long_paths.py runs with the setting off: 15 of its 17 tests fail
without the change. Checked by hand in the installed app with files at
312 to 380 characters.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

1 files changed, 6 insertions, 3 deletions

diff --git a/packages/meshbay-node/src/meshbay_node/enrichment.py b/packages/meshbay-node/src/meshbay_node/enrichment.py
index 19aafba..c09c5e5 100644
--- a/packages/meshbay-node/src/meshbay_node/enrichment.py
+++ b/packages/meshbay-node/src/meshbay_node/enrichment.py
@@ -2,8 +2,11 @@
 thumbnail for Videos, tags and cover for Music, thumbnail and EXIF for Photos.
 NodeDaemon runs it; the enrichers themselves are in indexer/."""
 
+import os
 from dataclasses import replace
 
+from meshbay_common.paths import long_path
+
 from meshbay_node.indexer import DirectoryIndexer, GroupIndex
 from meshbay_node.roots import entry_abs_path
 
@@ -67,7 +70,7 @@ class EnrichmentMixin:
             if not _under_any_directory(entry.path, video_dirs):
                 continue
             file_path = entry_abs_path(indexer.roots, entry)
-            if not file_path or not file_path.exists():
+            if not file_path or not os.path.exists(long_path(file_path)):
                 continue
             self._enriched_attempted.add((indexer.group_id, entry.id))
 
@@ -153,7 +156,7 @@ class EnrichmentMixin:
             if owner is None:
                 continue
             file_path = entry_abs_path(indexer.roots, entry)
-            if not file_path or not file_path.exists():
+            if not file_path or not os.path.exists(long_path(file_path)):
                 continue
             self._enriched_attempted.add((indexer.group_id, entry.id))
 
@@ -236,7 +239,7 @@ class EnrichmentMixin:
             if not _under_any_directory(entry.path, photo_dirs):
                 continue
             file_path = entry_abs_path(indexer.roots, entry)
-            if not file_path or not file_path.exists():
+            if not file_path or not os.path.exists(long_path(file_path)):
                 continue
             self._enriched_attempted.add((indexer.group_id, entry.id))