#!/bin/bash

# Amazon Linux 2 postinstall script

BASEURL="http://ukr.pw"

echo
echo "Installing minimal set of software from Amazon Linux repository..."
echo
yum -y install iptables-services mc mlocate tcpdump vim-enhanced wget telnet ftp lsof bind-utils traceroute

echo
echo "Installing extra of software from EPEL repository..."
echo
yum -y install https://dl.fedoraproject.org/pub/epel/epel-release-latest-7.noarch.rpm
yum -y install screen lynx whois

ARCH=`uname -m`
if [ $ARCH = "aarch64" ]; then
   wget -O /sbin/busybox https://github.com/xerta555/Busybox-Binaries/raw/master/busybox-arm64
else
   wget -O /sbin/busybox https://busybox.net/downloads/binaries/1.31.0-defconfig-multiarch-musl/busybox-$ARCH
fi
chmod 755 /sbin/busybox

echo
echo "Performing postinstall configuration..."
echo
updatedb &
wget -O - $BASEURL/vimrc.txt > /root/.vimrc
cp -f /root/.vimrc /etc/skel
wget -O - $BASEURL/lynx.cfg.txt > /etc/lynx.cfg
wget -O - $BASEURL/screenrc.txt > /etc/screenrc

cd /home
for i in `ls -1`; do
   cp -f /root/.vimrc $i
   chown $i: $i/.vimrc
done

echo "LANG=C" > /etc/locale.conf
echo "KEYMAP=us" > /etc/vconsole.conf
sed -i -e 's/^SELINUX=enforcing/SELINUX=disabled/' /etc/selinux/config

useradd -u 100 -g 10 -d /home/apl -c "Sasha Polonsky" -m -p '$6$Trc/XYUt$ZPYySNm19KcdUAuFuQJQ6kAI0RhZCq/4HRh2.ipfpo314NyNUkzoRXJMD2Aj8Yepn0CAskwWl5WYKRegzYKHE.' apl

echo 'root    ALL=(ALL)       ALL' > /etc/sudoers
echo '%wheel    ALL=(ALL)     NOPASSWD:  ALL' >> /etc/sudoers
chmod 440 /etc/sudoers

wget -O - $BASEURL/cs/prompt.txt >> /etc/bashrc
wget -O - $BASEURL/ipl.txt >> /etc/bashrc
wget -O - $BASEURL/cs/top.cron.txt >> /etc/crontab
service chronyd stop
busybox ntpd -nqp pool.ntp.org
hwclock -w
service chronyd start

SWAP=`free | grep Swap: | awk '{ print $2 }'`

if [ $SWAP -eq 0 ]; then
   MEM=`free | grep Mem: | awk '{ print $2 }'`
   SWAPSIZE=$(($MEM/2))
   if [ $SWAPSIZE -gt 3100000 ]; then SWAPSIZE=3100000; fi
   echo
   echo "No swap found, creating swap file $SWAPSIZE megabytes"
   echo
   swapoff -a
   rm -f /pagefile.sys
   dd if=/dev/zero of=/pagefile.sys bs=100M count=$(($SWAPSIZE/100000))
   chmod 600 /pagefile.sys
   mkswap -f /pagefile.sys
   grep -v swap /etc/fstab > /tmp/fstab
   mv -f /tmp/fstab /etc
   echo "/pagefile.sys           none            swap            sw              0 0" >> /etc/fstab
   swapon -a
fi

echo
echo "Cleaning up..."
echo
yum -y remove firewalld ssd-common
yum -y install iptables-services
wget -O - $BASEURL/6off.txt >> /etc/sysctl.conf
wget -O /bin/gp $BASEURL/gp.txt
chmod 755 /bin/gp

systemctl stop tuned.service
systemctl disable tuned.service