This script checks for available system updates, reports if a reboot is required, lists enabled repositories, and sends an email notification to specified recipients with the update details.

generate-pkg-report.sh

#!/bin/bash

# Configuration: Define recipients (space-separated emails)
RECIPIENTS="administrator@example.com"

# Constants
DASHES="##############################"

# Function: Check for updates
check_updates() {
  dnf check-update --quiet | grep -v "^$"
}

# Function: Count updates
count_updates() {
  echo "$1" | sed '/^\s*$/d' | wc -l
}

# Function: Check if a restart is required
check_restart() {
  if ! needs-restarting -r &>/dev/null; then
    echo "Reboot $(hostname) is required to update the kernel or core libraries."
  else
    echo ""
  fi
}

# Function: Fetch enabled repositories
fetch_repositories() {
  dnf repolist enabled -v | grep 'Repo-name' | sed -r 's/.{15}//'
}

# Function: Build the email report
build_report() {
  local updates="$1"
  local restart="$2"
  local repos="$3"

  local report="$DASHES\n# RESTART REQUIRED\n$DASHES\n"
  if [[ -n $restart ]]; then
    report+="$restart\n\n"
  else
    report+="No restart required.\n\n"
  fi
  report+="$DASHES\n# UPDATES AVAILABLE\n$DASHES\n"
  report+="$updates\n\n"
  report+="$DASHES\n# REPOSITORIES\n$DASHES\n"
  report+="$repos\n"
  echo -e "$report"
}

# Function: Send email to recipients
send_email() {
  local subject="$1"
  local body="$2"

  for recipient in $RECIPIENTS; do
    echo -e "$body" | mail -s "$subject" "$recipient"
  done
}

# Main script execution
main() {
  local updates=$(check_updates)
  local updates_count=$(count_updates "$updates")
  local restart_required=$(check_restart)
  local repositories=$(fetch_repositories)

  if [[ $updates_count -gt 0 ]]; then
    local report=$(build_report "$updates" "$restart_required" "$repositories")
    local subject="[WARNING] ${updates_count} Updates for $(hostname) available"
    send_email "$subject" "$report"
  fi
}

# Run the script
main