fix: handle chown failures gracefully on external mounts

DATA_DIRS chown failures (NFS, SMB/CIFS, FUSE) crashed the container under set -e. The old image never chowned these directories, so users with external mounts had a working setup that broke on upgrade with zero config changes.

- Collect mkdir and chown failures per-directory instead of crashing
- Emit a single consolidated warning listing all affected directories with current ownership and remediation steps
- Container continues to start; Django reports at runtime if it cannot write to a specific directory
- Local volumes are unaffected: chown still runs and succeeds silently

docker/init/03-init-dispatcharr.sh

@@ -1,6 +1,9 @@
 #!/bin/bash
 
-# Define directories that need to exist and be owned by PUID:PGID
+# Define directories that need to exist and be owned by PUID:PGID.
+# DATA_DIRS may reside on external mounts (NFS, SMB/CIFS, FUSE) where
+# mkdir and chown can fail. Failures are collected and reported as a
+# single consolidated warning so the container still starts.
 DATA_DIRS=(
     "/data/backups"
     "/data/logos"
@@ -14,17 +17,24 @@ DATA_DIRS=(
     "/data/scripts"
 )
 
+# APP_DIRS live on the image layer and are always locally writable.
 APP_DIRS=(
     "/app/logo_cache"
     "/app/media"
     "/app/static"
 )
 
-# Create all directories
-for dir in "${DATA_DIRS[@]}" "${APP_DIRS[@]}"; do
+# Create app directories (image layer — always writable)
+for dir in "${APP_DIRS[@]}"; do
     mkdir -p "$dir"
 done
 
+# Create data directories, tolerating failures on external mounts
+_failed_mkdir=()
+for dir in "${DATA_DIRS[@]}"; do
+    _mkdir_err=$(mkdir -p "$dir" 2>&1) || _failed_mkdir+=("$dir ($_mkdir_err)")
+done
+
 # Ensure /app itself is owned by PUID:PGID (needed for uwsgi socket creation)
 if [ "$(id -u)" = "0" ] && [ -d "/app" ]; then
     if [ "$(stat -c '%u:%g' /app)" != "$PUID:$PGID" ]; then
@@ -50,11 +60,16 @@ fi
 # NOTE: mac doesn't run as root, so only manage permissions
 # if this script is running as root
 if [ "$(id -u)" = "0" ]; then
-    # Fix data directories (non-recursive to avoid touching user files)
+    # Fix data directories (non-recursive to avoid touching user files).
+    # Failures are collected rather than fatal — directories may be on
+    # external mounts (NFS, SMB/CIFS, FUSE) that reject chown.
+    _failed_chown=()
     for dir in "${DATA_DIRS[@]}"; do
-        if [ -d "$dir" ] && [ "$(stat -c '%u:%g' "$dir")" != "$PUID:$PGID" ]; then
-            echo "Fixing ownership for $dir"
-            chown "$PUID:$PGID" "$dir"
+        if [ -d "$dir" ] && [ "$(stat -c '%u:%g' "$dir" 2>/dev/null)" != "$PUID:$PGID" ]; then
+            _chown_err=$(chown "$PUID:$PGID" "$dir" 2>&1) || {
+                _current_owner=$(stat -c '%u:%g' "$dir" 2>/dev/null || echo "unknown")
+                _failed_chown+=("$dir (current: $_current_owner, error: $_chown_err)")
+            }
         fi
     done
 
@@ -70,11 +85,46 @@ if [ "$(id -u)" = "0" ]; then
     # No secondary check needed here — duplicating it could chown without updating
     # the sentinel, creating inconsistent state.
 
-    # Fix /data directory ownership (non-recursive)
-    if [ -d "/data" ] && [ "$(stat -c '%u:%g' /data)" != "$PUID:$PGID" ]; then
-        echo "Fixing ownership for /data (non-recursive)"
-        chown "$PUID:$PGID" /data
+    # Fix /data directory ownership (non-recursive).
+    # Tolerates failure for the same external-mount reasons as DATA_DIRS.
+    if [ -d "/data" ] && [ "$(stat -c '%u:%g' /data 2>/dev/null)" != "$PUID:$PGID" ]; then
+        _chown_err=$(chown "$PUID:$PGID" /data 2>&1) || {
+            _current_owner=$(stat -c '%u:%g' /data 2>/dev/null || echo "unknown")
+            _failed_chown+=("/data (current: $_current_owner, error: $_chown_err)")
+        }
     fi
 
-    chmod +x /data
+    chmod +x /data 2>/dev/null || true
+fi
+
+# Consolidated warning for all mkdir/chown failures.
+# Emitted outside the root guard so non-root mkdir failures are also reported.
+if [ ${#_failed_mkdir[@]} -gt 0 ] || [ ${#_failed_chown[@]} -gt 0 ]; then
+    echo ""
+    echo "================================================================"
+    echo "WARNING: Some data directories could not be created or updated."
+    echo "  This typically occurs with NFS, SMB/CIFS, or other external"
+    echo "  mounts that restrict ownership changes."
+    echo ""
+    if [ ${#_failed_mkdir[@]} -gt 0 ]; then
+        echo "  Could not create:"
+        for entry in "${_failed_mkdir[@]}"; do
+            echo "    - $entry"
+        done
+        echo ""
+    fi
+    if [ ${#_failed_chown[@]} -gt 0 ]; then
+        echo "  Could not set ownership to $PUID:$PGID:"
+        for entry in "${_failed_chown[@]}"; do
+            echo "    - $entry"
+        done
+        echo ""
+    fi
+    echo "  To fix, either:"
+    echo "    1. Set PUID/PGID to match your mount's owner"
+    echo "    2. Fix ownership on the host/NAS:"
+    echo "       sudo chown $PUID:$PGID <path>"
+    echo "    3. For SMB/CIFS: set uid=$PUID,gid=$PGID in mount options"
+    echo "================================================================"
+    echo ""
 fi