From aa5fb5bb2f73f77e7d33879deea7583c1acc5838 Mon Sep 17 00:00:00 2001
From: Peter Wood <peter@peterwood.dev>
Date: Mon, 26 May 2025 15:05:39 -0400
Subject: [PATCH] feat: Improve checksum calculation by using a temporary cache
 directory and enhancing permission handling; fixes permission denied error

---
 plex/backup-plex.sh | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/plex/backup-plex.sh b/plex/backup-plex.sh
index fc3f5a9..f2da595 100755
--- a/plex/backup-plex.sh
+++ b/plex/backup-plex.sh
@@ -230,9 +230,14 @@ send_notification() {
 # Enhanced checksum calculation with caching
 calculate_checksum() {
     local file="$1"
-    local cache_file="${file}.md5"
+    # Use /tmp for cache files to avoid permission issues
+    local cache_dir="/tmp/plex-backup-cache"
+    local cache_file="$cache_dir/$(echo "$file" | sed 's|/|_|g').md5"
     local file_mtime=$(stat -c %Y "$file" 2>/dev/null || echo "0")
     
+    # Create cache directory if it doesn't exist
+    mkdir -p "$cache_dir" 2>/dev/null || true
+    
     # Check if cached checksum exists and is newer than file
     if [ -f "$cache_file" ]; then
         local cache_mtime=$(stat -c %Y "$cache_file" 2>/dev/null || echo "0")
@@ -263,7 +268,7 @@ calculate_checksum() {
     # Check if sudo checksum is valid
     if [[ -n "$checksum" && "$checksum" =~ ^[a-f0-9]{32}$ ]]; then
         # Cache the checksum with appropriate permissions
-        sudo bash -c "echo '$checksum' > '$cache_file'" 2>/dev/null || true
+        echo "$checksum" | sudo tee "$cache_file" >/dev/null 2>&1 || true
         echo "$checksum"
         return 0
     fi