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This script collects operating system details and installed package information from both '''RPM-based''' (e.g., RHEL, Rocky Linux) and '''DPKG-based''' (e.g., Debian, Ubuntu) systems. 

It is designed to be used with the '''backup_script''' directive in '''rsnapshot.conf''', allowing automated inclusion of system inventory data in regular backup snapshots. This is useful for auditing, compliance, and system inventory tracking.

== Pre-requisites ==
If '''rsnapshot''' is not installed on the system,  install [[Rsnapshot]] and configure as per the below article:

[[Rsnapshot]]

== Client-Side Script Setup (RPM or Debian-Based Machines) ==

=== Create the Script File ===
Create a file named '''system_info.sh''' with the following content:

<pre>
#!/bin/bash

OUTPUT="/root/system_info.txt"

# Overwrite old content with new system info
{
    echo "===== OS Release Information ====="
    cat /etc/*release 2>/dev/null

    echo -e "\n===== Installed Packages ====="

    # Detect package manager and run the appropriate command
    if command -v rpm &>/dev/null; then
        echo -e "\n-- Using rpm:"
        rpm -qa
    fi

    if command -v dpkg &>/dev/null; then
        echo -e "\n-- Using dpkg:"
        dpkg --list
    fi
} > "$OUTPUT"
</pre>

=== Make the Script Executable ===
<pre>
chmod +x /root/system_info.sh
</pre>

You can save this script in any preferred directory, such as /root, /opt, or /etc, based on your system organization and permissions.
=== Calling the Script from Rsnapshot ===

Add the following line to the '''/etc/rsnapshot.conf''' file to execute the script before backups:

<pre>
backup_script   /usr/bin/ssh root@<client-hostname> "/root/system_info.sh"   <foldername>/.ignore1/
</pre>

* Replace '''client-hostname''' with the target client machine.
* Replace '''foldername''' with the appropriate identifier.

To include the system_info.txt output file in the Rsnapshot backup, add the following line to '''/etc/rsnapshot.conf''':

<pre>
backup   root@<client-hostname>:/root/system_info.txt   <foldername>/
</pre>

=== Cron Job (Optional): Run Script Weekly ===

If you want to run this script locally on the client machine, configure the following cron job:
To run the script weekly (e.g., every Sunday at 2:00 AM), add the following line to the root user’s crontab:

<pre>
0 2 * * 0 /root/system_info.sh >> /var/log/system_info.log 2>&1
</pre>

This ensures that system information is regularly collected and logged, even outside of Rsnapshot runs.

== Result ==
The script generates '''/root/system_info.txt''', which is then included in the Rsnapshot backup. 

This helps maintain a historical record of installed packages and OS information across systems.