Fixes to disk usage

custom-metrics/disk-usage.sh

@@ -22,27 +22,28 @@ for i in {1..6}; do
     # Use process substitution instead of pipe to avoid subshell issues
     if [[ "$OS_TYPE" == "macos" ]]; then
         # macOS df format: Filesystem 512-blocks Used Available Capacity iused ifree %iused  Mounted on
-        # Mount points can have spaces, so we need to handle the full line
-        while IFS= read -r line; do
-            # Skip header line
-            if [[ "$line" =~ ^Filesystem ]]; then
+        # Skip pseudo-filesystems (map auto_home, map auto_nfs) and devfs
+        df 2>/dev/null | tail -n +2 | while IFS= read -r line; do
+            # Get the first field to check filesystem type
+            filesystem=$(echo "$line" | awk '{print $1}')
+            
+            # Skip map entries and other pseudo-filesystems
+            if [[ "$filesystem" == "map" || "$filesystem" == "devfs" ]]; then
                 continue
             fi
             
-            # Extract fields using awk (handles multi-word mount points)
-            filesystem=$(echo "$line" | awk '{print $1}')
+            # For valid filesystems, extract: blocks (col 2), used (col 3), mount point (col 9+)
             blocks=$(echo "$line" | awk '{print $2}')
             used=$(echo "$line" | awk '{print $3}')
-            # Mount point is everything from column 9 onwards
             mount=$(echo "$line" | awk '{for(i=9;i<=NF;i++) printf "%s%s", $i, (i<NF?" ":""); print ""}')
             
-            # Skip entries with 0 blocks (pseudo filesystems) or filesystem starting with dash
-            if [[ -n "$mount" && -n "$used" && -n "$blocks" && "$blocks" != "0" && "$filesystem" != "-" ]]; then
+            # Skip entries with 0 blocks
+            if [[ -n "$mount" && -n "$used" && -n "$blocks" && "$blocks" != "0" ]]; then
                 used_bytes=$((used * 512))
                 total_bytes=$((blocks * 512))
                 echo "$timestamp $mount $used_bytes $total_bytes" >> "$LOGFILE"
             fi
-        done < <(df 2>/dev/null)
+        done
     else
         # Linux df with --output flag
         while read -r mount used total; do