Refactor video_fix.sh for improved group handling

jellyfin/rootfs/etc/cont-init.d/25-video_fix.sh

@@ -0,0 +1,42 @@
+#!/bin/bash
+# shellcheck shell=bash
+
+# DO NOT use set -e here — we want graceful degradation
+
+RENDER_GID=104
+JELLYFIN_USER=abc
+GROUP_NAME=""
+
+log() {
+    echo "[render-fix] $*"
+}
+
+# Find group owning GID 104
+GROUP_NAME="$(getent group "$RENDER_GID" | cut -d: -f1 || true)"
+
+if [ -z "$GROUP_NAME" ]; then
+    GROUP_NAME="render104"
+    log "Creating group $GROUP_NAME with GID $RENDER_GID"
+    if ! groupadd -g "$RENDER_GID" "$GROUP_NAME" 2>/dev/null; then
+        log "Group creation failed (probably already exists). Continuing."
+    fi
+else
+    log "Group with GID $RENDER_GID already exists: $GROUP_NAME"
+fi
+
+# Ensure user exists
+if ! id "$JELLYFIN_USER" >/dev/null 2>&1; then
+    log "User $JELLYFIN_USER not found — skipping"
+    exit 0
+fi
+
+# Check if already member
+if id "$JELLYFIN_USER" | grep -qw "$GROUP_NAME"; then
+    log "User $JELLYFIN_USER already in group $GROUP_NAME"
+    exit 0
+fi
+
+log "Adding user $JELLYFIN_USER to group $GROUP_NAME"
+if ! usermod -aG "$GROUP_NAME" "$JELLYFIN_USER" 2>/dev/null; then
+    log "usermod failed — probably read-only user or already applied"
+fi