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MIT License
Copyright (c) 2020 Adrien
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.

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# gitea-updater
This script checks if Gitea is up to date, updates it if necessary and sends a message to a Telegram bot.
## Introduction
The trap to avoid when installing custom software is to update it. It seems obvious but it is never very easy because there is often a compilation part, interoperability management between bricks, backups and so on.
## Requirements
### Software
It is clearly necessary to have deployed a Gitea instance on your server. I wrote an article about this topic here: https://illuad.fr/2020/08/01/install-a-gitea-server.html
Since a message is sent to a Telegram bot, it is necessary to have one configured. I wrote an article about this topic here: https://illuad.fr/2020/10/27/get-a-telegram-alert-on-a-ssh-login-with-pam.html
### System
This script can run on any GNU/Linux machine.
This script uses `curl` and `restorecon` commands but if you have followed my article, some of them are required which means they will necessarily be installed.
## Installation
Since this script must be executed with root rights, it is a good practice to place it in `/usr/local/sbin/`.
```
sudo curl -Lo /usr/local/sbin/gitea-updater -sSf https://gitea.illuad.fr/adrien/gitea-updater/raw/branch/master/gitea-updater
sudo chmod 750 /usr/local/sbin/gitea-updater
```
## Configuration
This script requires the configuration of 2 variables to work: `key` and `chat_id`.
Variables `key` and `chat_id` correspond to the API key and the chat id obtained during the bot creation process.
#### Fast variables setting
For the `key` variable.
```
sudo sed -i "s/key=/key=<your_key>/" /usr/local/sbin/tls-checker
```
For the `chat_id` variable.
```
sudo sed -i "s/chat_id=/chat_id=<your_chat_id>/" /usr/local/sbin/tls-checker
```
## Automation
Running this script automatically is a good idea, here is what you should have in the cron jobs of the root user.
```
sudo crontab -l
0 1 * * * /usr/local/sbin/gitea-updater
```
Every day at 1:00 am, the script will check if the Gitea is up to date.

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#! /usr/bin/env bash
# abort on nonzero exitstatus
set -o errexit
# abort on unbound variable
set -o nounset
# don't hide errors within pipes
set -o pipefail
# set your API key here
key=
# set your chat id here
chat_id=
function send_message {
if [ $# -eq 0 ]
then
echo "No argument supplied. Please specify the message to send."
else
curl --silent --show-error --fail --request POST https://api.telegram.org/${key}/sendMessage --data chat_id=${chat_id} --data text="${1}" --output /dev/null
fi
}
function update_gitea {
systemctl stop gitea.service
# download the latest version
sudo curl --location --output /usr/local/bin/gitea --silent --show-error --fail https://dl.gitea.io/gitea/${1}/gitea-${1}-linux-amd64
# set the correct permissions
sudo chmod +x /usr/local/bin/gitea
restorecon /usr/local/bin/gitea
if systemctl start gitea.service
then
send_message "[Gitea] - Gitea has just been updated."
else
send_message "[Gitea] - Gitea service did not start correctly. Please log in as soon as possible and see what went wrong."
fi
}
# retrieve local release
local_release=$(/usr/local/bin/gitea --version | awk '{print $3}')
# retrieve the latest release
latest_release=$(curl -sSf "https://api.github.com/repos/go-gitea/gitea/releases/latest" | grep '"tag_name":' | sed --regexp-extended 's/.*"([^"]+)".*/\1/' | cut --characters=2-)
# compare these two versions
if [ ${latest_release} == ${local_release} ]
then
send_message "[Gitea] - Gitea is up to date."
else
send_message "[Gitea] - Gitea is not up to date (https://github.com/go-gitea/gitea/releases/tag/v${latest_release})."
update_gitea ${latest_release}
fi