#!/bin/bash
#
# *Note:* these installation instructions are also available in executable
#         form for use with vagrant under `vagrant/Install-on-Centos-8.sh`.
#
# Installing the Required Software
# ================================
#
# These instructions expect that you have a freshly installed CentOS version 8.
# Make sure all packages are up-to-date by running:
#
    sudo dnf update -y

# The standard CentOS repositories don't contain all the required packages,
# you need to enable the EPEL repository as well. For example for SELinux
# related redhat-hardened-cc1 package. To enable it on CentOS run:

    sudo dnf install -y epel-release redhat-rpm-config

# EPEL contains Postgres 9.6 and 10, but not PostGIS. Postgres 9.4+/10/11/12
# and PostGIS 2.4/2.5/3.0 are availble from postgresql.org

    sudo dnf -qy module disable postgresql
    sudo dnf install -y https://download.postgresql.org/pub/repos/yum/reporpms/EL-8-x86_64/pgdg-redhat-repo-latest.noarch.rpm

# Now you can install all packages needed for Nominatim:

#DOCS:    :::sh
    sudo dnf --enablerepo=powertools install -y postgresql12-server \
                        postgresql12-contrib postgresql12-devel postgis30_12 \
                        wget git cmake make gcc gcc-c++ libtool policycoreutils-python-utils \
                        llvm-toolset ccache clang-tools-extra \
                        php-pgsql php php-intl php-json libpq-devel \
                        bzip2-devel proj-devel boost-devel \
                        python3-pip python3-setuptools python3-devel \
                        expat-devel zlib-devel libicu-dev

    pip3 install --user psycopg2 python-dotenv psutil Jinja2 PyICU argparse-manpage


#
# System Configuration
# ====================
#
# The following steps are meant to configure a fresh CentOS installation
# for use with Nominatim. You may skip some of the steps if you have your
# OS already configured.
#
# Creating Dedicated User Accounts
# --------------------------------
#
# Nominatim will run as a global service on your machine. It is therefore
# best to install it under its own separate user account. In the following
# we assume this user is called nominatim and the installation will be in
# /srv/nominatim. To create the user and directory run:
#
sudo mkdir -p /srv/nominatim       #DOCS:    sudo useradd -d /srv/nominatim -s /bin/bash -m nominatim
sudo chown vagrant /srv/nominatim  #DOCS:
#
# You may find a more suitable location if you wish.
#
# To be able to copy and paste instructions from this manual, export
# user name and home directory now like this:
#
    export USERNAME=vagrant        #DOCS:    export USERNAME=nominatim
    export USERHOME=/srv/nominatim
#
# **Never, ever run the installation as a root user.** You have been warned.
#
# Make sure that system servers can read from the home directory:

    chmod a+x $USERHOME

# Setting up PostgreSQL
# ---------------------
#
# CentOS does not automatically create a database cluster. Therefore, start
# with initializing the database, then enable the server to start at boot:


    sudo /usr/pgsql-12/bin/postgresql-12-setup initdb
    sudo systemctl enable postgresql-12

#
# Next tune the postgresql configuration, which is located in 
# `/var/lib/pgsql/data/postgresql.conf`. See section *Postgres Tuning* in
# [the installation page](../admin/Installation.md#postgresql-tuning)
# for the parameters to change.
#
# Now start the postgresql service after updating this config file.

    sudo systemctl restart postgresql-12

#
# Finally, we need to add two postgres users: one for the user that does
# the import and another for the webserver which should access the database
# only for reading:
#

    sudo -u postgres createuser -s $USERNAME
    sudo -u postgres createuser apache

#
# Installing Nominatim
# ====================
#
# Building and Configuration
# --------------------------
#
# Get the source code from Github and change into the source directory
#
if [ "x$1" == "xyes" ]; then  #DOCS:    :::sh
    cd $USERHOME
    git clone --recursive git://github.com/openstreetmap/Nominatim.git
    cd Nominatim
else                               #DOCS:
    cd $USERHOME/Nominatim         #DOCS:
fi                                 #DOCS:

# When installing the latest source from github, you also need to
# download the country grid:

if [ ! -f data/country_osm_grid.sql.gz ]; then       #DOCS:    :::sh
    wget --no-verbose -O data/country_osm_grid.sql.gz https://www.nominatim.org/data/country_grid.sql.gz
fi                                 #DOCS:

# The code must be built in a separate directory. Create this directory,
# then configure and build Nominatim in there:

#DOCS:    :::sh
    mkdir $USERHOME/build
    cd $USERHOME/build
    cmake $USERHOME/Nominatim
    make
    sudo make install

#
# Setting up the Apache Webserver
# -------------------------------
#
# The webserver should serve the php scripts from the website directory of your
# [project directory](../admin/Import.md#creating-the-project-directory).
# Therefore set up a project directory and populate the website directory:
#
    mkdir $USERHOME/nominatim-project
    cd $USERHOME/nominatim-project
    nominatim refresh --website
#
# You need to create an alias to the website directory in your apache
# configuration. Add a separate nominatim configuration to your webserver:

#DOCS:```sh
sudo tee /etc/httpd/conf.d/nominatim.conf << EOFAPACHECONF
<Directory "$USERHOME/nominatim-project/website">
  Options FollowSymLinks MultiViews
  AddType text/html   .php
  DirectoryIndex search.php
  Require all granted
</Directory>

Alias /nominatim $USERHOME/nominatim-project/website
EOFAPACHECONF
#DOCS:```

sudo sed -i 's:#.*::' /etc/httpd/conf.d/nominatim.conf #DOCS:

#
# Then reload apache
#

    sudo systemctl enable httpd
    sudo systemctl restart httpd

#
# Adding SELinux Security Settings
# --------------------------------
#
# It is a good idea to leave SELinux enabled and enforcing, particularly
# with a web server accessible from the Internet. At a minimum the
# following SELinux labeling should be done for Nominatim:

    sudo semanage fcontext -a -t httpd_sys_content_t "/usr/local/nominatim/lib/lib-php(/.*)?"
    sudo semanage fcontext -a -t httpd_sys_content_t "$USERHOME/nominatim-project/website(/.*)?"
    sudo semanage fcontext -a -t lib_t "$USERHOME/nominatim-project/module/nominatim.so"
    sudo restorecon -R -v /usr/local/lib/nominatim
    sudo restorecon -R -v $USERHOME/nominatim-project


# You need to create a minimal configuration file that tells nominatim
# the name of your webserver user:

#DOCS:```sh
echo NOMINATIM_DATABASE_WEBUSER="apache" | tee .env
#DOCS:```


# Nominatim is now ready to use. Continue with
# [importing a database from OSM data](../admin/Import.md).