#!/bin/bash
# LinuxGSM info_distro.sh module
# Author: Daniel Gibbs
# Contributors: http://linuxgsm.com/contrib
# Website: https://linuxgsm.com
# Description: Variables providing useful info on the Operating System such as disk and performace info.
# Used for command_details.sh, command_debug.sh and alert.sh.

functionselfname="$(basename "$(readlink -f "${BASH_SOURCE[0]}")")"

### Game Server pid
if [ "${status}" == "1" ]; then
	gameserverpid="$(tmux list-sessions -F "#{session_name} #{pane_pid}" | grep "^${sessionname} " | awk '{print $NF}')"
	if [ "${engine}" == "source" ]; then
		srcdslinuxpid="$(ps -ef | grep -v grep | grep "${gameserverpid}" | grep srcds_linux | awk '{print $2}')"
	elif [ "${engine}" == "goldsrc" ]; then
		hldslinuxpid="$(ps -ef | grep -v grep | grep "${gameserverpid}" | grep hlds_linux | awk '{print $2}')"
	fi
fi
### Distro information

## Distro
# Returns architecture, kernel and distro/os.
arch="$(uname -m)"
kernel="$(uname -r)"

# Distro Name - Ubuntu 16.04 LTS
# Distro Version - 16.04
# Distro ID - ubuntu
# Distro Codename - xenial

# Gathers distro info from various sources filling in missing gaps.
distro_info_array=(os-release lsb_release hostnamectl debian_version redhat-release)
for distro_info in "${distro_info_array[@]}"; do
	if [ -f "/etc/os-release" ] && [ "${distro_info}" == "os-release" ]; then
		distroname="$(grep "PRETTY_NAME" /etc/os-release | awk -F\= '{gsub(/"/,"",$2);print $2}')"
		distroversion="$(grep "VERSION_ID" /etc/os-release | awk -F\= '{gsub(/"/,"",$2);print $2}')"
		# Special var for rhel like distros to removed point in number e.g 8.4 to just 8.
		distroversionrh="$(sed -nr 's/^VERSION_ID="([0-9]*).+?"/\1/p' /etc/os-release)"
		distroid="$(grep "ID=" /etc/os-release | grep -v _ID | awk -F\= '{gsub(/"/,"",$2);print $2}')"
		distroidlike="$(grep "ID_LIKE=" /etc/os-release | grep -v _ID | awk -F\= '{gsub(/"/,"",$2);print $2}')"
		distrocodename="$(grep "VERSION_CODENAME" /etc/os-release | awk -F\= '{gsub(/"/,"",$2);print $2}')"
	elif [ "$(command -v lsb_release 2> /dev/null)" ] && [ "${distro_info}" == "lsb_release" ]; then
		if [ -z "${distroname}" ]; then
			distroname="$(lsb_release -sd)"
		elif [ -z "${distroversion}" ]; then
			distroversion="$(lsb_release -sr)"
		elif [ -z "${distroid}" ]; then
			distroid="$(lsb_release -si)"
		elif [ -z "${distrocodename}" ]; then
			distrocodename="$(lsb_release -sc)"
		fi
	elif [ "$(command -v hostnamectl 2> /dev/null)" ] && [ "${distro_info}" == "hostnamectl" ]; then
		if [ -z "${distroname}" ]; then
			distroname="$(hostnamectl | grep "Operating System" | sed 's/Operating System: //g')"
		fi
	elif [ -f "/etc/debian_version" ] && [ "${distro_info}" == "debian_version" ]; then
		if [ -z "${distroname}" ]; then
			distroname="Debian $(cat /etc/debian_version)"
		elif [ -z "${distroversion}" ]; then
			distroversion="$(cat /etc/debian_version)"
		elif [ -z "${distroid}" ]; then
			distroid="debian"
		fi
	elif [ -f "/etc/redhat-release" ] && [ "${distro_info}" == "redhat-release" ]; then
		if [ -z "${distroname}" ]; then
			distroname="$(cat /etc/redhat-release)"
		elif [ -z "${distroversion}" ]; then
			distroversion="$(rpm -qa \*-release | grep -Ei "oracle|redhat|centos|fedora" | cut -d"-" -f3)"
		elif [ -z "${distroid}" ]; then
			distroid="$(awk '{print $1}' /etc/redhat-release)"
		fi
	fi
done

# some RHEL based distros use 8.4 instead of just 8.
if [[ "${distroidlike}" == *"rhel"* ]] || [ "${distroid}" == "rhel" ]; then
	distroversioncsv="${distroversionrh}"
else
	distroversioncsv="${distroversion}"
fi

# Check if distro supported by distro vendor.
if [ "$(command -v distro-info 2> /dev/null)" ]; then
	distrosunsupported="$(distro-info --unsupported)"
	distrosunsupported_array=("${distrosunsupported}")
	for distrounsupported in "${distrosunsupported_array[@]}"; do
		if [ "${distrounsupported}" == "${distrocodename}" ]; then
			distrosupport=unsupported
			break
		else
			distrosupport=supported
		fi
	done
else
	distrosupport=unknown
fi

## Glibc version
# e.g: 1.17
glibcversion="$(ldd --version | sed -n '1s/.* //p')"

## tmux version
# e.g: tmux 1.6
if [ ! "$(command -V tmux 2> /dev/null)" ]; then
	tmuxv="${red}NOT INSTALLED!${default}"
	tmuxvdigit="0"
else
	tmuxvdigit="$(tmux -V | sed "s/tmux //" | sed -n '1 p' | tr -cd '[:digit:]')"
	if [ "${tmuxvdigit}" -lt "16" ]; then
		tmuxv="$(tmux -V) (>= 1.6 required for console log)"
	else
		tmuxv="$(tmux -V)"
	fi
fi

if [ "$(command -V java 2> /dev/null)" ]; then
	javaversion="$(java -version 2>&1 | grep "version")"
fi

if [ "$(command -v mono 2> /dev/null)" ]; then
	monoversion="$(mono --version 2>&1 | grep -Po '(?<=version )\d')"
fi

## Uptime
uptime="$(< /proc/uptime)"
uptime=${uptime/[. ]*/}
minutes="$((uptime / 60 % 60))"
hours="$((uptime / 60 / 60 % 24))"
days="$((uptime / 60 / 60 / 24))"

### Performance information

## Average server load
load="$(uptime | awk -F 'load average: ' '{ print $2 }')"

## CPU information
cpumodel="$(awk -F: '/model name/ {name=$2} END {print name}' /proc/cpuinfo | sed 's/^[ \t]*//;s/[ \t]*$//')"
cpucores="$(awk -F: '/model name/ {core++} END {print core}' /proc/cpuinfo)"
cpufreqency="$(awk -F: '/cpu MHz/ {freq=$2} END {print freq}' /proc/cpuinfo | sed 's/^[ \t]*//;s/[ \t]*$//')"
# CPU usage of the game server pid
if [ -n "${gameserverpid}" ]; then
	cpuused="$(ps --forest -o pcpu -g "${gameserverpid}" | awk '{s+=$1} END {print s}')"
	cpuusedmhz="$(echo "${cpufreqency} * ${cpuused} / 100" | bc)"
fi

## Memory information
# Available RAM and swap.

# Newer distros can use numfmt to give more accurate results.
if [ "$(command -v numfmt 2> /dev/null)" ]; then
	# Issue #2005 - Kernel 3.14+ contains MemAvailable which should be used. All others will be calculated.

	# get the raw KB values of these fields.
	physmemtotalkb="$(grep MemTotal /proc/meminfo | awk '{print $2}')"
	physmemfreekb="$(grep ^MemFree /proc/meminfo | awk '{print $2}')"
	physmembufferskb="$(grep ^Buffers /proc/meminfo | awk '{print $2}')"
	physmemcachedkb="$(grep ^Cached /proc/meminfo | awk '{print $2}')"
	physmemreclaimablekb="$(grep ^SReclaimable /proc/meminfo | awk '{print $2}')"

	# check if MemAvailable Exists.
	if grep -q ^MemAvailable /proc/meminfo; then
		physmemactualfreekb="$(grep ^MemAvailable /proc/meminfo | awk '{print $2}')"
	else
		physmemactualfreekb="$((physmemfreekb + physmembufferskb + physmemcachedkb))"
	fi

	# Available RAM and swap.
	physmemtotalmb="$((physmemtotalkb / 1024))"
	physmemtotal="$(numfmt --to=iec --from=iec --suffix=B "${physmemtotalkb}K")"
	physmemfree="$(numfmt --to=iec --from=iec --suffix=B "${physmemactualfreekb}K")"
	physmemused="$(numfmt --to=iec --from=iec --suffix=B "$((physmemtotalkb - physmemfreekb - physmembufferskb - physmemcachedkb - physmemreclaimablekb))K")"
	physmemavailable="$(numfmt --to=iec --from=iec --suffix=B "${physmemactualfreekb}K")"
	physmemcached="$(numfmt --to=iec --from=iec --suffix=B "$((physmemcachedkb + physmemreclaimablekb))K")"

	swaptotal="$(numfmt --to=iec --from=iec --suffix=B "$(grep ^SwapTotal /proc/meminfo | awk '{print $2}')K")"
	swapfree="$(numfmt --to=iec --from=iec --suffix=B "$(grep ^SwapFree /proc/meminfo | awk '{print $2}')K")"
	swapused="$(numfmt --to=iec --from=iec --suffix=B "$(($(grep ^SwapTotal /proc/meminfo | awk '{print $2}') - $(grep ^SwapFree /proc/meminfo | awk '{print $2}')))K")"
	# RAM usage of the game server pid
	# MB
	if [ "${gameserverpid}" ]; then
		memused="$(ps --forest -o rss -g "${gameserverpid}" | awk '{s+=$1} END {print s}' | awk '{$1/=1024;printf "%.0f",$1}{print $2}')"
		# %
		pmemused="$(ps --forest -o %mem -g "${gameserverpid}" | awk '{s+=$1} END {print s}')"
	fi
else
	# Older distros will need to use free.
	# Older versions of free do not support -h option.
	if [ "$(
		free -h > /dev/null 2>&1
		echo $?
	)" -ne "0" ]; then
		humanreadable="-m"
	else
		humanreadable="-h"
	fi
	physmemtotalmb="$(free -m | awk '/Mem:/ {print $2}')"
	physmemtotal="$(free ${humanreadable} | awk '/Mem:/ {print $2}')"
	physmemfree="$(free ${humanreadable} | awk '/Mem:/ {print $4}')"
	physmemused="$(free ${humanreadable} | awk '/Mem:/ {print $3}')"

	oldfree="$(free ${humanreadable} | awk '/cache:/')"
	if [ "${oldfree}" ]; then
		physmemavailable="n/a"
		physmemcached="n/a"
	else
		physmemavailable="$(free ${humanreadable} | awk '/Mem:/ {print $7}')"
		physmemcached="$(free ${humanreadable} | awk '/Mem:/ {print $6}')"
	fi

	swaptotal="$(free ${humanreadable} | awk '/Swap:/ {print $2}')"
	swapused="$(free ${humanreadable} | awk '/Swap:/ {print $3}')"
	swapfree="$(free ${humanreadable} | awk '/Swap:/ {print $4}')"
fi

### Disk information

## Available disk space on the partition.
filesystem="$(LC_ALL=C df -hP "${rootdir}" | tail -n 1 | awk '{print $1}')"
totalspace="$(LC_ALL=C df -hP "${rootdir}" | tail -n 1 | awk '{print $2}')"
usedspace="$(LC_ALL=C df -hP "${rootdir}" | tail -n 1 | awk '{print $3}')"
availspace="$(LC_ALL=C df -hP "${rootdir}" | tail -n 1 | awk '{print $4}')"

## LinuxGSM used space total.
rootdirdu="$(du -sh "${rootdir}" 2> /dev/null | awk '{print $1}')"
if [ -z "${rootdirdu}" ]; then
	rootdirdu="0M"
fi

## LinuxGSM used space in serverfiles dir.
serverfilesdu="$(du -sh "${serverfiles}" 2> /dev/null | awk '{print $1}')"
if [ -z "${serverfilesdu}" ]; then
	serverfilesdu="0M"
fi

## LinuxGSM used space total minus backup dir.
rootdirduexbackup="$(du -sh --exclude="${backupdir}" "${serverfiles}" 2> /dev/null | awk '{print $1}')"
if [ -z "${rootdirduexbackup}" ]; then
	rootdirduexbackup="0M"
fi

## Backup info
if [ -d "${backupdir}" ]; then
	# Used space in backups dir.
	backupdirdu="$(du -sh "${backupdir}" | awk '{print $1}')"
	# If no backup dir, size is 0M.
	if [ -z "${backupdirdu}" ]; then
		backupdirdu="0M"
	fi

	# number of backups set to 0 by default.
	backupcount=0

	# If there are backups in backup dir.
	if [ "$(find "${backupdir}" -name "*.tar.gz" | wc -l)" -ne "0" ]; then
		# number of backups.
		backupcount="$(find "${backupdir}"/*.tar.gz | wc -l)"
		# most recent backup.
		lastbackup="$(ls -1t "${backupdir}"/*.tar.gz | head -1)"
		# date of most recent backup.
		lastbackupdate="$(date -r "${lastbackup}")"
		# no of days since last backup.
		lastbackupdaysago="$((($(date +'%s') - $(date -r "${lastbackup}" +'%s')) / 60 / 60 / 24))"
		# size of most recent backup.
		lastbackupsize="$(du -h "${lastbackup}" | awk '{print $1}')"
	fi
fi

# Network Interface name
netint=$(${ipcommand} -o addr | grep "${ip}" | awk '{print $2}')
netlink=$(${ethtoolcommand} "${netint}" 2> /dev/null | grep Speed | awk '{print $2}')

# Sets the SteamCMD glibc requirement if the game server requirement is less or not required.
if [ "${appid}" ]; then
	if [ "${glibc}" = "null" ] || [ -z "${glibc}" ] || [ "$(printf '%s\n'${glibc}'\n' "2.14" | sort -V | head -n 1)" != "2.14" ]; then
		glibc="2.14"
	fi
fi

# Gather Port Info using ss
ssinfo="$(ss -tuplwn)"