#!/bin/bash

# https://one.majlovesreg.one/tag/code/
# https://one.majlovesreg.one/adding-pagespeed-to-a-running-nginx-instance
# https://github.com/majal/maj-server/tree/master/nginx-modules-pagespeed

# For predefined NGINX version, use:
# ngver=1.17.1
 
# For passing the version via the command line (i.e.: user@server:~$ ./mkbrotli 1.17.1), use:
ngver=$1
 
# For automated detection of currently installed NGINX version (not to be used for auto-updating, see hooks in post), use:
# ngver=$(nginx -v 2>&1 | grep -o '[0-9\.]*')
 
# To manually set NGINX modules directory:
# moddir=/path/to/modules/directory
 
# To automatically select NGINX modules directory:
[ -d /usr/share/nginx/modules ] && moddir=/usr/share/nginx/modules
[ -d $(nginx -V 2>&1 | grep -o 'prefix=[^ ]*' | sed 's/prefix=//')/modules ] && moddir=$(nginx -V 2>&1 | grep -o 'prefix=[^ ]*' | sed 's/prefix=//')/modules
[ -d $(nginx -V 2>&1 | grep -o 'modules-path=[^ ]*' | sed 's/modules-path=//') ] && moddir=$(nginx -V 2>&1 | grep -o 'modules-path=[^ ]*' | sed 's/modules-path=//')
[ $moddir ] || { echo '!! missing modules directory, exiting...'; exit 1; }
 
# Set temporary directory and build on it
builddir=$(mktemp -d)
cd ${builddir}
 
echo
echo '################################################################################'
echo
echo "Building PageSpeed for NGINX $ngver"
echo "Temporary build directory: $builddir"
echo "Modules directory: $moddir"
echo

# Use script provided by PageSpeed
nice -n 19 ionice -c 3 bash <(curl -f -L -sS https://ngxpagespeed.com/install) -n ${ngver} -m -b ${builddir} -a '--with-compat' -y || { echo '!! error with module creation, exiting...'; exit 1; }

# Replace ngx_pagespeed.so if exists, otherwise, copy it
[ -f ${moddir}/ngx_pagespeed.so ] && sudo mv ${moddir}/ngx_pagespeed.so ${moddir}/ngx_pagespeed.so.old
sudo chmod 644 /usr/local/nginx/modules/ngx_pagespeed.so || { echo '!! error with module path, exiting...'; exit 2; }
sudo cp /usr/local/nginx/modules/ngx_pagespeed.so ${moddir}/

# Clean up build files
cd ${builddir}/..
sudo rm -r /usr/local/nginx
rm -r ${builddir}

echo
echo "Sucessfully built PageSpeed for NGINX $ngver in $moddir"
echo
echo '################################################################################'
echo

# Start/restart NGINX.
# Not recommended if script is hooked since NGINX is automatically restarted by the package manager (e.g. apt) after an upgrade.
# Restarting NGINX before the upgrade could cause a module version mismatch.
# sudo nginx -t && { systemctl is-active nginx && sudo systemctl restart nginx || sudo systemctl start nginx; } || true
# echo
# systemctl --no-pager status nginx
# echo