#!/bin/bash

### this script makes everything to build a ready to boot .iso file of nanodesk
###
### By: DeltaLima
### 2023

CHROOTCMD="sudo chroot build/chroot/"
VERSION="$(git describe --tags)" #-$(git rev-parse --short HEAD)"

MIRROR=$1
if [ -z "$MIRROR" ]
then
  MIRROR="http://ftp.gwdg.de/debian/"
fi

# colors for colored output 8)
RED="\e[31m"
GREEN="\e[32m"
YELLOW="\e[33m"
ENDCOLOR="\e[0m"

function message() {
     case $1 in
     warn)
       MESSAGE_TYPE="${YELLOW}WARN${ENDCOLOR}"
     ;;
     error)
       MESSAGE_TYPE="${RED}ERROR${ENDCOLOR}"
     ;;
     info|*)
       MESSAGE_TYPE="${GREEN}INFO${ENDCOLOR}"
     ;;
     esac

     if [ "$1" == "info" ] || [ "$1" == "error" ]
     then
       MESSAGE=$2
     else
       MESSAGE=$1
     fi

     echo -e "[${MESSAGE_TYPE}] $MESSAGE"
}

error () 
{
  message error "ERROR!!"
  exit 1
}

message "installing requirements"
# ~fakeroot fakechroot~
# debootstrap chroot 
### https://www.willhaley.com/blog/custom-debian-live-environment/
sudo apt install \
  debootstrap \
  squashfs-tools \
  xorriso \
  isolinux \
  syslinux-efi \
  grub-pc-bin \
  grub-efi-amd64-bin \
  grub-efi-ia32-bin \
  mtools \
  dosfstools \
  coreutils \
  markdown || error

message "start building nanodesk ${YELLOW}${VERSION}${ENDCOLOR}"

read -p "press [enter] to continue"

### stuff begins here
message "Checking build directory"
test -f build/chroot || mkdir -p build/chroot

### i have the problem, that fakechroot will not work atm. in ubuntu 22.04 i get libc6 version mismatch errors. so we run it direct as root. not my favorite, but works for now.
message "running debootstrap with mirror $MIRROR"
sudo debootstrap bullseye build/chroot/ $MIRROR || sudo debootstrap bullseye build/chroot/ $MIRROR 

message "copy xdgmenumaker deb file into chroot"
sudo cp deb/xdgmenumaker* build/chroot/tmp || error
message "deploying install_base"
cat <<\EOF > build/chroot/tmp/install_base.sh
#!/bin/bash

RED="\e[31m"
GREEN="\e[32m"
YELLOW="\e[33m"
ENDCOLOR="\e[0m"

function message() {
     case $1 in
     error)
       MESSAGE_TYPE="${RED}ERROR${ENDCOLOR}"
     ;;
     info|*)
       MESSAGE_TYPE="${GREEN}INFO${ENDCOLOR}"
     ;;
     esac

     if [ "$1" == "info" ] || [ "$1" == "error" ]
     then
       MESSAGE=$2
     else
       MESSAGE=$1
     fi

     echo -e "[${MESSAGE_TYPE}] ${YELLOW}install_base${ENDCOLOR}: $MESSAGE"
}


error () 
{
  message error "ERROR!!"
  exit 1
}

### hostname setting
echo nanodesk > /etc/hostname

### noninteractive
DEBIAN_FRONTEND=noninteractive
export DEBIAN_FRONTEND
sed -i 's/main$/main contrib non-free/g' /etc/apt/sources.list
apt-update
### packages
message "install nanodesk base packages"
apt install -y \
	live-boot \
	linux-image-amd64 \
	firmware-linux \
	grub-pc \
	ifupdown \
	net-tools \
	wireless-tools \
	wpagui \
	isc-dhcp-client \
	man \
	console-data \
	locales \
	sudo \
	xserver-xorg \
	jwm \
	xdm \
	xterm \
	xfe \
	pcmanfm \
	audacious \
	htop \
	host \
	mc \
	wget \
	curl \
	less \
	rsync \
	vim \
	links2 \
	firefox-esr \
	transmission-gtk \
	lxterminal \
	arandr \
	zenity \
	ncdu \
	gparted \
	git \
	/tmp/xdgmenumaker*.deb || error

message "set hostname in hosts"
sed -i 's/localhost/localhost nanodesk/g' /etc/hosts

### set root password
message "set root password to debian"
echo -e "debian\ndebian" | (passwd root)

### add debian user
message "create user debian"
useradd -m -U -s /bin/bash debian

### set password
message "set password debian for user debian"
echo -e "debian\ndebian" | (passwd debian)

### Configure timezone and locale
#dpkg-reconfigure locales
#dpkg-reconfigure console-data
#dpkg-reconfigure keyboard-configuration
###https://serverfault.com/a/689947
message "set locales and tzdata"
echo "Europe/Berlin" > /etc/timezone && \
    dpkg-reconfigure -f noninteractive tzdata && \
    sed -i -e 's/# en_US.UTF-8 UTF-8/en_US.UTF-8 UTF-8/' /etc/locale.gen && \
    echo 'LANG="en_US.UTF-8"'>/etc/default/locale && \
    dpkg-reconfigure --frontend=noninteractive locales && \
    locale-gen en_US.UTF-8 && \
    update-locale LANG=en_US.UTF-8

### clean cache
message "apt clean"
apt clean

KERNEL_VER="$(dpkg -l "linux-image-*" | grep "^ii"| awk '{print $2}' | grep -E 'linux-image-[0-9]\.([0-9]|[0-9][0-9])\.([0-9]|[0-9][0-9])-([0-9]|[0-9][0-9])-amd64$')"
message "KERNEL_VER=$KERNEL_VER"

### but fetch packages for grub and kernel, so we do not need to download them
### in case nanodesk get installed to diska
message "apt --download linux-image and grub packages to have them in cache for installation by user"
apt -d --reinstall install \
	linux-image-amd64 \
	$(echo $KERNEL_VER) \
	grub-pc grub-pc-bin \
	grub-common \
	grub2-common \
	os-prober || error
EOF
message "run install_base"
$CHROOTCMD /bin/bash /tmp/install_base.sh || error

message "clear /tmp"
$CHROOTCMD /usr/bin/rm -Rf /tmp/* || error

### process markdown files in src/ to html
message "convert .md from src to .html in build/chroot"
for md in $(find src/ -name "*.md")
  do markdown $md > $(echo $md|sed 's/\.md/\.html/')
done

echo $VERSION > src/usr/share/nanodesk/version

### copy nanodesk configs to chroot
message "copy nanodesk config files into chroot"
sudo cp -r src/* build/chroot/

message "correct file permissions"
$CHROOTCMD /usr/bin/chmod 440 /etc/sudoers

### liveboot part, https://www.willhaley.com/blog/custom-debian-live-environment/
message "checking liveboot directories"
for dir in $(echo build/{staging/{EFI/BOOT,boot/grub/x86_64-efi,isolinux,live},tmp})
do
  message "check $dir"
  test -d $dir || mkdir -p $dir
done
#mkdir -p build/{staging/{EFI/BOOT,boot/grub/x86_64-efi,isolinux,live},tmp}

message "make squashfs"
test -f build/staging/live/filesystem.squashfs && sudo rm build/staging/live/filesystem.squashfs
sudo mksquashfs \
    build/chroot \
    build/staging/live/filesystem.squashfs \
    -e boot || error

message "copy kernel and init images"
cp build/chroot/boot/vmlinuz-* build/staging/live/vmlinuz || error
cp build/chroot/boot/initrd.img-* build/staging/live/initrd || error

message "isolinux.cfg"
cat <<EOF >build/staging/isolinux/isolinux.cfg
UI vesamenu.c32

MENU TITLE Boot Menu
DEFAULT linux
TIMEOUT 600
MENU RESOLUTION 640 480
MENU COLOR border       30;44   #40ffffff #a0000000 std
MENU COLOR title        1;36;44 #9033ccff #a0000000 std
MENU COLOR sel          7;37;40 #e0ffffff #20ffffff all
MENU COLOR unsel        37;44   #50ffffff #a0000000 std
MENU COLOR help         37;40   #c0ffffff #a0000000 std
MENU COLOR timeout_msg  37;40   #80ffffff #00000000 std
MENU COLOR timeout      1;37;40 #c0ffffff #00000000 std
MENU COLOR msg07        37;40   #90ffffff #a0000000 std
MENU COLOR tabmsg       31;40   #30ffffff #00000000 std

LABEL linux
  MENU LABEL nanodesk $VERSION Live [BIOS/ISOLINUX]
  MENU DEFAULT
  KERNEL /live/vmlinuz
  APPEND initrd=/live/initrd boot=live

LABEL linux
  MENU LABEL nanodesk $VERSION Live [BIOS/ISOLINUX] (nomodeset)
  MENU DEFAULT
  KERNEL /live/vmlinuz
  APPEND initrd=/live/initrd boot=live nomodeset
EOF

cat <<EOF > build/staging/boot/grub/grub.cfg
insmod part_gpt
insmod part_msdos
insmod fat
insmod iso9660

insmod all_video
insmod font

set default="0"
set timeout=30

# If X has issues finding screens, experiment with/without nomodeset.

menuentry "nanodesk $VERSION Live [EFI/GRUB]" {
    search --no-floppy --set=root --label NANODESK
    linux (\$root)/live/vmlinuz boot=live
    initrd (\$root)/live/initrd
}

menuentry "nanodesk $VERSION Live [EFI/GRUB] (nomodeset)" {
    search --no-floppy --set=root --label NANODESK
    linux (\$root)/live/vmlinuz boot=live nomodeset
    initrd (\$root)/live/initrd
}
EOF

cp build/staging/boot/grub/grub.cfg build/staging/EFI/BOOT/ || error

cat <<'EOF' >build/tmp/grub-embed.cfg
if ! [ -d "$cmdpath" ]; then
    # On some firmware, GRUB has a wrong cmdpath when booted from an optical disc.
    # https://gitlab.archlinux.org/archlinux/archiso/-/issues/183
    if regexp --set=1:isodevice '^(\([^)]+\))\/?[Ee][Ff][Ii]\/[Bb][Oo][Oo][Tt]\/?$' "$cmdpath"; then
        cmdpath="${isodevice}/EFI/BOOT"
    fi
fi
configfile "${cmdpath}/grub.cfg"
EOF

message "copy isolinux"
cp /usr/lib/ISOLINUX/isolinux.bin "build/staging/isolinux/" || error
cp /usr/lib/syslinux/modules/bios/* "build/staging/isolinux/" || error

message "copy grub-efi"
cp -r /usr/lib/grub/x86_64-efi/* "build/staging/boot/grub/x86_64-efi/" || error

message "make efi images"
grub-mkstandalone -O i386-efi \
    --modules="part_gpt part_msdos fat iso9660" \
    --locales="" \
    --themes="" \
    --fonts="" \
    --output="build/staging/EFI/BOOT/BOOTIA32.EFI" \
    "boot/grub/grub.cfg=build/tmp/grub-embed.cfg" || error

grub-mkstandalone -O x86_64-efi \
    --modules="part_gpt part_msdos fat iso9660" \
    --locales="" \
    --themes="" \
    --fonts="" \
    --output="build/staging/EFI/BOOT/BOOTx64.EFI" \
    "boot/grub/grub.cfg=build/tmp/grub-embed.cfg" || error

(cd build/staging && \
    dd if=/dev/zero of=efiboot.img bs=1M count=20 && \
    mkfs.vfat efiboot.img && \
    mmd -i efiboot.img ::/EFI ::/EFI/BOOT && \
    mcopy -vi efiboot.img \
        ../../build/staging/EFI/BOOT/BOOTIA32.EFI \
        ../../build/staging/EFI/BOOT/BOOTx64.EFI \
        ../../build/staging/boot/grub/grub.cfg \
        ::/EFI/BOOT/
) || error

message "generate .iso"
xorriso \
    -as mkisofs \
    -iso-level 3 \
    -o "build/nanodesk_$VERSION.iso" \
    -full-iso9660-filenames \
    -volid "NANODESK" \
    --mbr-force-bootable -partition_offset 16 \
    -joliet -joliet-long -rational-rock \
    -isohybrid-mbr /usr/lib/ISOLINUX/isohdpfx.bin \
    -eltorito-boot \
        isolinux/isolinux.bin \
        -no-emul-boot \
        -boot-load-size 4 \
        -boot-info-table \
        --eltorito-catalog isolinux/isolinux.cat \
    -eltorito-alt-boot \
        -e --interval:appended_partition_2:all:: \
        -no-emul-boot \
        -isohybrid-gpt-basdat \
    -append_partition 2 C12A7328-F81F-11D2-BA4B-00A0C93EC93B build/staging/efiboot.img \
    "build/staging"