Fix: Add disk space checking for OPNsense VM FreeBSD image decompression

- Add check_disk_space() function to verify available storage
- Check for 20GB before download and 15GB before decompression
- Provide clear error messages showing available vs required space
- Add proper error handling for unxz decompression failures
- Clean up compressed .xz file after decompression to save space
- Add progress messages for download and decompression steps

Fixes issue where script fails at line 611 with 'No space left on device'
when /tmp directory lacks sufficient space for ~10-15GB decompressed image.

vm/opnsense-vm.sh

@@ -91,6 +91,17 @@ function cleanup() {
   rm -rf $TEMP_DIR
 }
 
+function check_disk_space() {
+  local path="$1"
+  local required_gb="$2"
+  local available_kb=$(df -k "$path" | awk 'NR==2 {print $4}')
+  local available_gb=$((available_kb / 1024 / 1024))
+  if [ $available_gb -lt $required_gb ]; then
+    return 1
+  fi
+  return 0
+}
+
 TEMP_DIR=$(mktemp -d)
 pushd $TEMP_DIR >/dev/null
 function send_line_to_vm() {
@@ -605,11 +616,41 @@ if [ -z "$URL" ]; then
   exit 1
 fi
 msg_ok "Download URL: ${CL}${BL}${URL}${CL}"
+
+# Check available disk space (require at least 20GB for safety)
+if ! check_disk_space "$TEMP_DIR" 20; then
+  AVAILABLE_GB=$(df -h "$TEMP_DIR" | awk 'NR==2 {print $4}')
+  msg_error "Insufficient disk space in temporary directory ($TEMP_DIR)."
+  msg_error "Available: ${AVAILABLE_GB}, Required: ~20GB for FreeBSD image decompression."
+  msg_error "Please free up space or ensure /tmp has sufficient storage."
+  exit 1
+fi
+
+msg_info "Downloading FreeBSD Image"
 curl -f#SL -o "$(basename "$URL")" "$URL"
 echo -en "\e[1A\e[0K"
+msg_ok "Downloaded ${CL}${BL}$(basename "$URL")${CL}"
+
+# Check disk space again before decompression
+if ! check_disk_space "$TEMP_DIR" 15; then
+  AVAILABLE_GB=$(df -h "$TEMP_DIR" | awk 'NR==2 {print $4}')
+  msg_error "Insufficient disk space for decompression."
+  msg_error "Available: ${AVAILABLE_GB}, Required: ~15GB for decompressed image."
+  exit 1
+fi
+
+msg_info "Decompressing FreeBSD Image (this may take a few minutes)"
 FILE=FreeBSD.qcow2
-unxz -cv $(basename $URL) >${FILE}
-msg_ok "Downloaded ${CL}${BL}${FILE}${CL}"
+if ! unxz -cv $(basename $URL) >${FILE}; then
+  msg_error "Failed to decompress FreeBSD image."
+  msg_error "This is usually caused by insufficient disk space."
+  df -h "$TEMP_DIR"
+  exit 1
+fi
+
+# Remove the compressed file to save space
+rm -f "$(basename "$URL")"
+msg_ok "Decompressed ${CL}${BL}${FILE}${CL}"
 
 STORAGE_TYPE=$(pvesm status -storage $STORAGE | awk 'NR>1 {print $2}')
 case $STORAGE_TYPE in