Validate email addresses

[Klintrup]

This pull request includes updates to the README.md, SECURITY.md, and check_zpool.sh files. The changes mainly focus on enhancing the zpool monitoring script, updating the documentation, and adding support for version 1.4.x in the security file.

Updates to the zpool monitoring script:

• check_zpool.sh: The script is now more robust with the addition of error handling and validation for email addresses. It also now includes a function to set error codes based on the current and new error codes. The health check for each device in a ZFS pool has been improved to include more states and the corresponding error codes. The script can now also be run from cron and send email notifications to specified recipients.

Updates to documentation:

• README.md: The documentation has been updated to reflect the changes in the script. It now includes information on running the script from Cron/Zabbix/NRPE/Nagios, and has updated the synopsis, output states, and compatibility sections. [1] [2]

Support for new version:

• SECURITY.md: The file now includes support for version 1.4.x.

Summary by CodeRabbit

• New Features

  • Expanded ZFS monitoring capabilities to support additional systems: Cron, Zabbix, and Nagios.
  • Enhanced error handling in ZFS monitoring with detailed output examples and exit codes for various volume states.
  • Added email validation before sending error notifications in the ZFS monitoring script.

• Documentation

  • Updated compatibility information for Linux and detailed testing on FreeBSD 8.0+ and Ubuntu 22.04 LTS.

[coderabbitai]

Walkthrough

The latest update enhances the ZFS monitoring script by expanding support to include Cron, Zabbix, and Nagios. It now offers detailed output examples with specific exit codes reflecting various ZFS volume states. The script gains improved error handling with new functions for validating emails and setting error codes, ensuring robust notifications and compatibility with systems like FreeBSD 8.0+ and Ubuntu 22.04 LTS.

Changes

File	Change Summary
README.md	Expanded ZFS monitoring support to include Cron, Zabbix, and Nagios. Added detailed output examples and updated compatibility for Linux, FreeBSD 8.0+, and Ubuntu 22.04 LTS.
check_zpool.sh	Introduced validate_email and set_error_code functions for better error handling and email validation based on ZFS pool health statuses.

🐇💻
A hop through code, a leap through lines,
New features unfold, as the script now shines.
Emails checked, errors caught with flair,
Zabbix and Nagios, now under the hare's care.
Monitor and manage, with ease so grand,
A bunny's touch—precise, yet gentle hand.

---

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Actionable comments posted: 1