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nas-ops/nas-system-update
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#!/bin/bash
# nas-system-update — Check available system updates (apt)
# Usage: nas-system-update
# Output: JSON (non-interactive mode) or colored text (terminal mode)
set -euo pipefail
if [ -t 1 ]; then INTERACTIVE=true; else INTERACTIVE=false; fi
# Colors (terminal mode only)
if $INTERACTIVE; then
RED='\033[0;31m'
GREEN='\033[0;32m'
YELLOW='\033[1;33m'
CYAN='\033[0;36m'
BOLD='\033[1m'
RESET='\033[0m'
else
RED='' GREEN='' YELLOW='' CYAN='' BOLD='' RESET=''
fi
if $INTERACTIVE; then
echo -e "${BOLD}--- Refreshing package list ---${RESET}"
fi
apt-get update -qq 2>/dev/null
# Parse apt-get --simulate full-upgrade
# Format:
# Inst name (available_version ...) → new package
# Inst name [current_version] (available_version ...) → upgrade
packages_json=""
count=0
while IFS= read -r line; do
# Extract package name (2nd field)
name=$(echo "$line" | awk '{print $2}' | tr -d '[:space:]')
[ -z "$name" ] && continue
# Current version: first word inside [...] if present, else N/A
current=$(echo "$line" | grep -oP '(?<=\[)[^\]]+' | awk '{print $1}' | head -1 | tr -d '[:space:]' || echo "")
[ -z "$current" ] && current="N/A"
# Available version: first word inside first (...)
available=$(echo "$line" | grep -oP '(?<=\()[^ ]+' | head -1 | tr -d '[:space:]')
[ -z "$available" ] && continue
if $INTERACTIVE; then
echo -e " ${CYAN}${name}${RESET} : ${YELLOW}${current}${RESET}${GREEN}${available}${RESET}"
fi
# Build JSON entry
entry="{\"name\":\"${name}\",\"current\":\"${current}\",\"available\":\"${available}\"}"
if [ $count -eq 0 ]; then
packages_json="${entry}"
else
packages_json="${packages_json},${entry}"
fi
count=$((count + 1))
done < <(apt-get --simulate full-upgrade 2>/dev/null | grep "^Inst")
# Check if reboot is required
reboot_required=false
if [ -f /var/run/reboot-required ]; then
reboot_required=true
fi
if $INTERACTIVE; then
echo ""
echo -e "${BOLD}--- Summary ---${RESET}"
if [ $count -eq 0 ]; then
echo -e "${GREEN}✅ System is up to date.${RESET}"
else
echo -e "${YELLOW}📦 ${count} package(s) available for upgrade.${RESET}"
fi
if $reboot_required; then
echo -e "${RED}⚠️ Reboot required.${RESET}"
fi
else
printf '{"count":%d,"reboot_required":%s,"packages":[%s]}\n' \
"$count" "$reboot_required" "$packages_json"
fi