#/bin/bash

for PARAM in "$@"; do
	case "$PARAM" in
		--version=*) DIST_VERSION="${PARAM/*=}" ;;
		--distrib=*) DISTRIB="${PARAM/*=}" ;;
		--static) STATIC=true ;;
		--help)
			echo "syntaxe: $0 [--help] [--static] [--version=7|8] [--distrib=CentOS|AlmaLinux]"
	esac
done
if [ -z "${DIST_VERSION}" ]; then
	DIST_VERSION=8
fi
if [ -z "${DISTRIB}" ]; then
	DISTRIB="CentOS"
fi


if ! which wget; then
	yum install -y wget
fi

IF="$(ip route show | grep ^default | sed 's/.* dev \([^ ]*\) *.*/\1/' | sort -u)"
IP="$(ip addr show $IF | grep inet\  | awk '{print $2}' | cut -d/ -f1)"
PREFIX="$(ip addr show $IF | grep inet\  | awk '{print $2}' | cut -d/ -f2)"
MASK="$(ipcalc -m $IP/$PREFIX | cut -d= -f2)"
GW="$(ip route show | grep ^default | sed 's/.* via \([^ ]*\) *.*/\1/' | sort -u)"
MAC="$(ip addr show $IF | grep ether\  | awk '{print $2}' | cut -d/ -f2 | tr [A-Z] [a-z])"
DNS="$(grep nameserver /etc/resolv.conf | grep -v 127.0.0.1 | awk '{printf $2","}' | sed 's/,$//')"
ARCH=$(uname -m | sed 's|i.86|i386|')

if [ "${DIST_VERSION}" == "8" ]; then
	#MIRROIR=http://lune.saacy.reslinger.net/repos/CentOS8/$ARCH/os
	if [ "$DISTRIB" == "CentOS" ]; then
		MIRROIR=http://mirror.centos.org/centos/8/BaseOS/$ARCH/os
	elif [ "$DISTRIB" == "AlmaLinux" ]; then
		MIRROIR=https://repo.almalinux.org/almalinux/8/BaseOS/x86_64/os
	fi
elif [ "${DIST_VERSION}" == "7" ]; then
	#MIRROIR=http://centos.mirrors.ovh.net/ftp.centos.org/7/os/$ARCH
	MIRROIR=http://mirror.centos.org/centos/7/os/$ARCH
	#MIRROIR=http://lune.saacy.reslinger.net/repos/CentOS7/$ARCH/os
else
	echo "Version ${DIST_VERSION} non reconnue" >&2
	exit 1
fi
#DESKTOP=desktop
INST_OPTIONS="inst.lang=fr_FR inst.keymap=fr-latin9 panic=1 ks.sendsn ks.sendmac inst.sshd=1 net.ifnames=0 biosdevname=0 $DESKTOP"
INST_OPTIONS="${INST_OPTIONS} inst.vnc inst.vncpassword=SDFGHJKL"
if [ -z "$DNS" ]; then
	if [ $(whois $IP | grep -ci dedibox) -gt 0 ]; then
		# Dedibox
		DNS=62.210.16.6,62.210.16.7
	else
		# OVH
		DNS=213.186.33.99
		#DNS=46.246.46.46,194.132.32.23
	fi
fi
if [ $(mount | grep -c /boot\ ) -eq 1 ]; then
    PARTBOOT=""
else
    PARTBOOT="/boot"
fi
cd /boot
wget "$MIRROIR"/isolinux/{vmlinuz,initrd.img}
if [ $(ip link show | grep ^[0-9] | grep -v lo: | wc -l) -eq 1 ]; then
	INST_OPTIONS="ks.device=link ${INST_OPTIONS}"
else
	INST_OPTIONS="ks.device=$MAC ${INST_OPTIONS}"
fi
if [ ! -z "$STATIC" ]; then
	INST_OPTIONS="ip=$IP::$GW:$MASK:$(hostname -s):$IF:off:${DNS/,*} ${INST_OPTIONS}"
fi
if [ -f /boot/grub2/grub.cfg -o $(find /boot/efi/EFI -name grub.cfg | egrep -c '(almalinux|centos|redhat)') -gt 0 ]; then
  if [ $(sed 's/ /\n/g' /proc/cmdline | grep -c console) -gt 1 ]; then
	#  echo "On ajoute les console pour avoir une config également en serial"
	  CONSOLE="$(for i in `sed 's/ /\n/g' /proc/cmdline | grep console`; do echo -n "$i "; done | sed 's/ $//')"
  fi

	#BOOT_DISK="$(df -hP /boot/ | awk '{print $1}' | tail -n1)"
	BOOT_DISK="$(mount | grep -e '\s'"`df -h /boot | tail -n1 | awk '{print $6}'`"'\s' | cut -f1 -d\ )"
	#BOOT_UUID="$(tune2fs -l ${BOOT_DISK} | grep UUID | awk '{print $3}')"
	BOOT_UUID="$(blkid ${BOOT_DISK} | sed 's/.*\sUUID="\([^ ]*\)".*/\1/')"
	if [ $(echo "${BOOT_DISK}" | grep -c /dev/md) -eq 1 ]; then
		# Pas forcement /dev/md2 !!!
	    UUID_BOOT_DISK="mduuid/$(mdadm --detail ${BOOT_DISK} | grep UUID | awk '{print $3}' | sed 's/://g')"
	else
	    #echo "UUID_BOOT_DISK non defini" >&2
	    #exit 1
	    UUID_BOOT_DISK="${BOOT_UUID}"
	fi

	cat >> /etc/grub.d/40_custom <<EOF
menuentry '$DISTRIB ${DIST_VERSION} Install (PXE)' --unrestricted {
        set root='${UUID_BOOT_DISK}'
        if [ x\$feature_platform_search_hint = xy ]; then
          search --no-floppy --fs-uuid --set=root --hint='${UUID_BOOT_DISK}' ${BOOT_UUID}
        else
          search --no-floppy --fs-uuid --set=root ${BOOT_UUID}
        fi
        linux $PARTBOOT/vmlinuz ${INST_OPTIONS} inst.ks=https://boot.reslinger.net/ks${DIST_VERSION}.cfg inst.stage2=$MIRROIR ${CONSOLE}
        initrd  $PARTBOOT/initrd.img
}
EOF
	if [ -d /sys/firmware/efi -a -e /boot/efi/EFI/redhat/grub.cfg ]; then
        CONFDIR=/boot/efi/EFI/redhat
    elif [ -d /sys/firmware/efi -a -e /boot/efi/EFI/almalinux/grub.cfg ]; then
        CONFDIR=/boot/efi/EFI/almalinux
    elif [ -d /sys/firmware/efi -a -e /boot/efi/EFI/centos/grub.cfg ]; then
		CONFDIR=/boot/efi/EFI/centos
	else
		CONFDIR=/boot/grub2
	fi
	grub2-mkconfig --output="${CONFDIR}"/grub.cfg
	grub2-reboot "$DISTRIB ${DIST_VERSION} Install (PXE)"
elif [ -f /boot/grub/grub.conf ]; then
	cat >> /boot/grub/grub.conf <<EOF
title $DISTRIB ${DIST_VERSION} Install (PXE)
        root (hd0,0)
        kernel $PARTBOOT/vmlinuz ${INST_OPTIONS} inst.ks=https://boot.reslinger.net/ks${DIST_VERSION}.cfg inst.stage2=$MIRROIR ${CONSOLE}
        initrd $PARTBOOT/initrd.img
EOF
	NB="$(grep -Ev '^($| *#)' /boot/grub/grub.conf | grep -c title)"
	NB=$[$NB-1]
	echo -e "savedefault --default=$NB --once\nquit\n" | grub --batch
else
	echo "Bootloader non identifié !" >&2
	exit 1
fi

# avec tigervnc:
# vncviewer CompressLevel 9 FullColor 176.31.103.156:1