Update shell script for wiki.js (Linux install in ~/wiki)

update_wikijs.sh

#!/bin/bash
#
# Upgrade guide: https://docs.requarks.io/install/upgrade
# Prerequisite: Wiki.js installed in ~/wiki, this script saved in ~
cd ~
# Remove former downloaded file
rm wiki-js.tar.gz
rm ~/config.yml.bak
# Save config.yml
cp wiki/config.yml ~/config.yml.bak
# Get download url for latest version from Github API
LOCATION=$(curl -s https://api.github.com/repos/Requarks/wiki/releases/latest \
| grep "tag_name" \
| awk '{print "https://github.com/Requarks/wiki/releases/download/" substr($2, 2, length($2)-3) "/wiki-js.tar.gz"}')
# echo URL: $LOCATION
# Download latest version
wget -O wiki-js.tar.gz $LOCATION
# Stop wiki.js service
sudo systemctl stop wiki.service
# Extract archive
tar xzf wiki-js.tar.gz -C ./wiki
cd wiki
# Restore config.yml
cp ~/config.yml.bak ./config.yml
# Start wiki.js service
sudo systemctl start wiki.service