Spoiled certificate can lead to service unavailability

[Birbber]

Prerequisites

• I have checked the Wiki and Discussions and found no answer

• I have searched other issues and found no duplicates

• I want to report a bug and not ask a question

Operating system type

macOS (aka Darwin)

CPU architecture

64-bit ARM

Installation

GitHub releases or script from README

Setup

On one machine

AdGuard Home version

0.107.19

Description

What did you do?

• Install it as a service
• Enable Encryption (set up cert and key, etc.)
• Use AGHome for a while
• Stop the service and change 1 character in the key's contents in AdGuardHome.yaml
• Try to start the service

Expected result

The service is available. The encryption settings page shows the correct status for the certificate-key pair.

Actual result

The service is not available. UI can't load.

➜  sudo ./AdGuardHome -s start
2022/11/24 16:02:46 [info] AdGuard Home, version v0.107.19
2022/11/24 16:02:46 [info] service: control action: start
2022/11/24 16:02:46 [info] service: action start has been done successfully on darwin-launchd


/Applications/AdGuardHome
➜  sudo ./AdGuardHome -s status
2022/11/24 16:03:38 [info] AdGuard Home, version v0.107.19
2022/11/24 16:03:38 [info] service: control action: status
2022/11/24 16:03:38 [info] service: stopped
2022/11/24 16:03:38 [info] service: action status has been done successfully on darwin-launchd


/Applications/AdGuardHome
➜  sudo ./AdGuardHome -s start
2022/11/24 16:03:43 [info] AdGuard Home, version v0.107.19
2022/11/24 16:03:43 [info] service: control action: start
2022/11/24 16:03:43 [fatal] service: executing action "start": Failed to start AdGuard Home service: "launchctl" failed with stderr: /Library/LaunchDaemons/AdGuardHome.plist: service already loaded
Load failed: 37: Operation already in progress

The issue is only seen in the debug log:
[fatal] initializing tls: loading config: validating certificate pair: no valid keys were found