Server migration script

migrate.sh

#!/bin/bash

main() {
    do_swap
    do_instructor_server_access
    do_aliases
    do_composer
    do_github
    do_modules
    do_repository
    do_laravel_app 'bookmark'
    do_laravel_app 'p2'
    do_laravel_app 'p3'
    do_sites
    do_done
}



#
# SWAP
# 
do_swap() {
    dump "SWAP"
    NEEDLE='swapfile'
    HAYSTACK=$(sudo swapon -s)

    if grep -q $NEEDLE <<<$HAYSTACK; then
        echo "Swap already enabled"
    else 
        echo "Enabling swap"
        sudo sh -c '
            fallocate -l 4G /swapfile
            chmod 600 /swapfile
            mkswap /swapfile
            swapon /swapfile
        '
        ADD_LINE="/swapfile   none    swap    sw    0   0"
        grep -qxF "$ADD_LINE" /etc/fstab || echo $ADD_LINE >> /etc/fstab
    fi
}



#
# INSTRUCTOR SERVER ACCESS
#
do_instructor_server_access() {
    dump "INSTRUCTOR SERVER ACCESS"

    NEEDLE="susanbuck@fas.harvard.edu" 
    HAYSTACK=$(cat ~/.ssh/authorized_keys)

    if grep -q $NEEDLE <<<$HAYSTACK; then
        echo "Instructor access already enabled (key found in ~/.ssh/authorized_keys)."
    else 
        echo "Instructor key not found in ~/.ssh/authorized_keys; adding."
        echo $KEY >> ~/.ssh/authorized_keys
    fi
}



# 
# ALIASES
# 
do_aliases() {
    dump "ALIASES"
    if [ -s ~/.bash_aliases ]; then
        echo "Aliases already added (~/.bash_aliases is not empty)"
    else
            
cat > ~/.bash_aliases <<EOL
# Edit the bashrc file
alias configedit='code ~/.bashrc'

# Edit the alias config file
alias configalias='code ~/.bash_aliases'

# Recognize changes to bashrc config
# (which will also recognize changes to the alias config file)
alias configrefresh='source ~/.bashrc'

# Restart server and PHP
alias restart='systemctl restart nginx; systemctl reload php8.0-fpm'

# Open your e15 directory
alias e15='code -a /var/www/e15'

# Edit nginx sites config file for this course
alias sites='code /etc/nginx/sites-available/hes'

# Edit php.ini file
alias phpini='code /etc/php/8.0/fpm/php.ini'

# View server error log file
alias errorlog='code /var/log/nginx/error.log'
EOL

    source ~/.bashrc
    fi
}



#
# COMPOSER
#
do_composer() {
    dump "COMPOSER"
    if [ -s /usr/bin/composer ]; then
        echo "Composer already installed."
    else
        cd /usr/bin
        curl -sS https://getcomposer.org/installer | sudo php
        sudo mv composer.phar composer
    fi
}



#
# GITHUB
#
do_github() {
    dump "GITHUB SSH KEYS"
    NEEDLE="GitHub does not provide shell access"
    HAYSTACK=$(ssh -T -o StrictHostKeyChecking=no git@github.com  2>&1) 

    if grep -q "$NEEDLE" <<<$HAYSTACK; then
        echo 'Github SSH keys already set up.'
    else
        
        if [ ! -f ~/.ssh/id_rsa.pub ]; then
            echo 'Generating SSH key'
            ssh-keygen -q -t rsa -N '' <<< $'\ny' >/dev/null 2>&1
            # -N new_passphrase provides the new passphrase
            # -q                silence ssh-keygen
            # -f filename       specifies the filename of the key file
        fi

        echo "Please visit https://github.com/settings/keys and add the following key:"
        echo ""
        echo $(cat ~/.ssh/id_rsa.pub)
        echo ""
        read -p "Enter (y) once you have added the key: "
    fi
}



# 
# SERVER MODULES
#
do_modules() {

    dump "MODULES"
    
    # Assuming if xml module was installed, all others were installed
    NEEDLE='xml'
    HAYSTACK=$(dpkg --get-selections | grep -i php)

    if grep -q $NEEDLE <<<$HAYSTACK; then
        echo "Modules already enabled"
    else 

        MAJOR=$(php -r 'echo PHP_MAJOR_VERSION;')
        MINOR=$(php -r 'echo PHP_MINOR_VERSION;')
        PHP_VERSION=${MAJOR}.${MINOR}

        echo -e "\nUpdating modules for php $PHP_VERSION"
        sudo sh -c '
            sudo add-apt-repository ppa:ondrej/php
            sudo apt-get --assume-yes update
            sudo apt-get --assume-yes install php${PHP_VERSION}-mbstring php${PHP_VERSION}-xml php${PHP_VERSION}-curl zip unzip
        '
    fi
}





# 
# REPOSITORY
#
do_repository() {
    dump "e15 REPOSITORY"
    if [ -d /var/www/e15 ]; then
        echo "/var/www/e15 directory/repository already exists"
    else 
        echo "Going to clone your e15 repository into /var/www/"
        cd "/var/www"
        read -p "Enter your Github username: " USERNAME
        git clone git@github.com:$USERNAME/e15.git
    fi
}

#
# SETUP LARAVEL APPS
#
do_laravel_app() {

    APP_NAME=$1

    dump "CHECKING FOR LARAVEL APP $APP_NAME"
  
    if [ ! -d /var/www/e15/$APP_NAME ]; then
        echo "$APP_NAME not found; skipping."
    else 
        echo "Going to setup $APP_NAME Laravel app..."
        cd /var/www/e15/$APP_NAME

        echo "Adjusting permissions on 'storage' and 'bootstrap/cache'"
        chown -R www-data storage
        chown -R www-data bootstrap/cache

        if [ -d /var/www/e15/$APP_NAME/vendor ]; then
            echo "Detected vendor directory already exists; skipping running 'composer update'"
        else 
            echo "Vendor directory does not exist; running 'composer update' to build"
            composer update
        fi

        if [ -f /var/www/e15/$APP_NAME/.env ]; then
            echo "Detected .env file already exists"
        else 
            echo "Creating .env file"
            cp .env.example .env
            php artisan key:generate
        fi
    fi
}

#
# SITES
do_sites() {
    dump "SETTING UP SITES CONFIG"
    if [ -s /etc/nginx/sites-available/hes ]; then
        echo "/etc/nginx/sites-available/hes already exists; skipping."
    else 

    read -p "Enter the domain you’re using using for this course: " DOMAIN
                
cat > /etc/nginx/sites-available/hes <<EOL
server {
    listen 80;
    listen [::]:80;
    server_name e15p2.$DOMAIN;
    root /var/www/e15/bookmark/public;

    add_header X-Frame-Options "SAMEORIGIN";
    add_header X-Content-Type-Options "nosniff";

    index index.php;

    charset utf-8;

    location / {
        try_files $uri $uri/ /index.php?$query_string;
    }

    location = /favicon.ico {
        access_log off; log_not_found off;
    }
    location = /robots.txt {
        access_log off; log_not_found off;
    }

    error_page 404 /index.php;

    location ~ \.php$ {
        fastcgi_pass unix:/var/run/php/php8.0-fpm.sock;
        fastcgi_param SCRIPT_FILENAME \$realpath_root\$fastcgi_script_name;
        include fastcgi_params;
    }

    location ~ /\.(?!well-known).* {
        deny all;
    }
}

server {
    listen 80;
    listen [::]:80;
    server_name bookmark.$DOMAIN;
    root /var/www/e15/bookmark/public;

    add_header X-Frame-Options "SAMEORIGIN";
    add_header X-Content-Type-Options "nosniff";

    index index.php;

    charset utf-8;

    location / {
        try_files $uri $uri/ /index.php?$query_string;
    }

    location = /favicon.ico {
        access_log off; log_not_found off;
    }
    location = /robots.txt {
        access_log off; log_not_found off;
    }

    error_page 404 /index.php;

    location ~ \.php$ {
        fastcgi_pass unix:/var/run/php/php8.0-fpm.sock;
        fastcgi_param SCRIPT_FILENAME \$realpath_root\$fastcgi_script_name;
        include fastcgi_params;
    }

    location ~ /\.(?!well-known).* {
        deny all;
    }
}

server {
    listen 80;
    server_name e15practice.$DOMAIN;
    root /var/www/e15/practice/;
    index index.php index.html;
    location ~ \.php$ {
        fastcgi_pass unix:/var/run/php/php8.0-fpm.sock;
        fastcgi_param SCRIPT_FILENAME \$realpath_root\$fastcgi_script_name;
        include fastcgi_params;
    }
}

server {
    listen 80;
    server_name e15p1.$DOMAIN;
    root /var/www/e15/p1/;
    index index.php index.html;
    location ~ \.php$ {
        fastcgi_pass unix:/var/run/php/php8.0-fpm.sock;
        fastcgi_param SCRIPT_FILENAME \$realpath_root\$fastcgi_script_name;
        include fastcgi_params;
    }
}
EOL

    ln -s /etc/nginx/sites-available/hes /etc/nginx/sites-enabled
    systemctl restart nginx

    echo "Created /etc/nginx/sites-available/hes and linked it to /etc/nginx/sites-enabled/hes"
    echo "Restarted nginx"

    fi
}

do_done() {
    dump "DONE"
    echo "The migration script has completed!"
    echo "Here are manual steps you still need to complete:"
    echo "   1. Update your server’s DNS settings so it points to your new server’s IP address"
    echo "   2. Update the .env files in your Laravel apps with the appropriate values."
}



#
# DUMP HELPER
#
dump () {
    echo ""
    echo "===> $1"
}

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