#!/bin/bash

release=${1%-netinst.iso}
execution_directory=$(pwd)
release_name=${release}-netinst
newrelease=${release}-custom
myfiles=${HOME}/myfiles
wantedfile=${execution_directory}/wanted.txt
excludedfile=${execution_directory}/excluded.txt

# global parameters
original_iso=${execution_directory}/${release_name}.iso
newrelease_iso=${execution_directory}/${newrelease}.iso

cd "${execution_directory}" || exit 1

temp_file=/tmp/tmp_iso_directory.txt
if [ -e ${temp_file} ]
then
  temp_dir=$(cat ${temp_file})
else
  temp_dir=$(mktemp -d)
  echo "${temp_dir}" > ${temp_file}
fi

if [ ! -e "${original_iso}" ]
then
  echo "image not found : ${original_iso}"
  exit 0
fi

package_list='xorriso isolinux python3-apt apt-utils python3-requests rsync wget'
# shellcheck disable=SC2086
if apt-get -s install ${package_list} |grep ^Inst
  then
    echo "sudo apt install ${package_list} !!!"
    exit 0
fi

ask() {
    USER_ANSWER="?";
    while [ "$USER_ANSWER" != "n" ] && [ "$USER_ANSWER" != "y" ] ; do
        echo -n "$1 ? [y/n] "
        read -r -n 1 USER_ANSWER
        echo "";
    done
    if [ "$USER_ANSWER" == "y" ] ; then
        return 0
    else
        return 1
    fi
}

if [ ! -e "${wantedfile}" ]
then
cat > "${wantedfile}" <<EOF
local-apt-repository
rsync
EOF
fi

if [ ! -e "${excludedfile}" ]
then
cat > "${excludedfile}" <<EOF
gdm3
chromium
firefox
EOF
fi

echo "##### extracting iso"
if [ ! -e "${temp_dir}"/md5sum.txt ]
then
  echo "extracting iso to ${temp_dir}"
  xorriso -osirrox on -indev "${original_iso}" -extract / "${temp_dir}"
  chmod -R +w "${temp_dir}"
fi

echo "##### myfiles generation"
if ask "populating myfiles with download_myfiles.py ?" 
then
  mkdir -p ~/myfiles
  if ! python3 download_myfiles.py --isodir "${temp_dir}"
  then
    echo "myfiles generation failure !!!"
    exit 1
  fi
fi

echo "##### myfiles generation"
if ask "populating myfiles with custom files ?" 
then 
  mkdir -p ~/myfiles/zips
  if [ ! -e ~/myfiles/zips/gnirehtet-java-v2.5.1.zip ]
  then
    cd ~/myfiles/zips/ && wget https://github.com/Genymobile/gnirehtet/releases/download/v2.5.1/gnirehtet-java-v2.5.1.zip
  fi
  if [ ! -e ~/myfiles/zips/dvb-firmware-osmc.zip ]
  then
    cd ~/myfiles/zips/ && wget https://github.com/osmc/dvb-firmware-osmc/archive/refs/heads/master.zip --output-document=dvb-firmware-osmc.zip
  fi
  if [ ! -e ~/myfiles/zips/alsa-firmware-1.2.4.tar.bz2 ]
  then
    cd ~/myfiles/zips/ && wget https://www.alsa-project.org/files/files/pub/firmware/alsa-firmware-1.2.4.tar.bz2
  fi
  if [ ! -e ~/myfiles/zips/libdvdcss-1.4.3.tar.bz2 ]
  then
    cd ~/myfiles/zips/ && wget https://download.videolan.org/pub/libdvdcss/1.4.3/libdvdcss-1.4.3.tar.bz2
  fi
fi

#https://gitlab.com/Dark-Sky/rpi-linux-udl/-/blob/master/firmware/dvb-usb-dibusb-6.0.0.8.fw
#https://github.com/osmc/dvb-firmware-osmc/blob/master/dvb-usb-dibusb-6.0.0.8.fw
#https://github.com/osmc/dvb-firmware-osmc/archive/refs/heads/master.zip


echo "generate preseed.cfg"
cat > /tmp/preseed.cfg <<"EOF"
#_preseed_V1
### Locale configuration
d-i debian-installer/language string fr
d-i debian-installer/country string FR
d-i debian-installer/locale select fr_FR.UTF-8
d-i keyboard-configuration/xkb-keymap select fr(latin9)
#d-i keyboard-configuration/toggle select No toggling
d-i	keyboard-configuration/layoutcode	string	fr
d-i	keyboard-configuration/modelcode	string	pc105
d-i	keyboard-configuration/variantcode	string	latin9
### Network configuration
d-i netcfg/enable boolean false
### account configuration
#d-i passwd/root-password-crypted password [$6$tYi0kNPyvi45IWqW$vOvUycJFPqZhg.N.g7wNZ96UriyvrxoumTuWpRD0OoRp47iuqGfvICxNrsVE0IRHaTs.KkU/btWqJYdetRlpE1]
#d-i passwd/user-fullname string Cyril CONSTANTIN
#d-i passwd/username string constcyr
#d-i passwd/user-password-crypted password [$6$tYi0kNPyvi45IWqW$vOvUycJFPqZhg.N.g7wNZ96UriyvrxoumTuWpRD0OoRp47iuqGfvICxNrsVE0IRHaTs.KkU/btWqJYdetRlpE1]
#d-i passwd/user-uid string 1000
#d-i passwd/user-default-groups string audio cdrom video
### Clock and time zone setup
d-i clock-setup/utc boolean true
d-i time/zone string Europe/Paris
# Controls whether to use NTP to set the clock during the install
#d-i clock-setup/ntp boolean true
# NTP server to use. The default is almost always fine here.
#d-i clock-setup/ntp-server string ntp.example.com
### Partitioning
### Base system installation
### Apt setup
d-i apt-setup/use_mirror boolean false
apt-cdrom-setup	apt-setup/cdrom/set-next	boolean	false
### Package selection
popularity-contest popularity-contest/participate boolean false
EOF

cat > "${myfiles}"/libdvdcss2.README <<"EOF"
libdvd-pkg: Downloading orig source...
I: libdvdcss_1.4.3
/usr/bin/wget --tries=3 --timeout=40 --read-timeout=40 --continue -O libdvdcss_1.4.3.orig.tar.bz2 \
          https://download.videolan.org/pub/libdvdcss/1.4.3/libdvdcss-1.4.3.tar.bz2 \
        || /usr/bin/uscan --noconf --verbose --rename --destdir=/usr/src/libdvd-pkg --check-dirname-level=0 --force-download --download-current-version /usr/share/libdvd-pkg/debian
--2026-01-02 21:06:57--  https://download.videolan.org/pub/libdvdcss/1.4.3/libdvdcss-1.4.3.tar.bz2
Résolution de download.videolan.org (download.videolan.org)… 213.36.253.2, 2a01:e0d:1:3:58bf:fa02:c0de:5
Connexion à download.videolan.org (download.videolan.org)|213.36.253.2|:443… connecté.
requête HTTP transmise, en attente de la réponse… 200 OK
Taille: 388404 (379K) [application/octet-stream]
Sauvegarde en: «libdvdcss_1.4.3.orig.tar.bz2»
libdvdcss_1.4.3.orig.tar.bz2       100%[==============================================================>] 379,30K   725KB/s    ds 0,5s    
2026-01-02 21:06:58 (725 KB/s) — «libdvdcss_1.4.3.orig.tar.bz2» sauvegardé [388404/388404]
EOF

cat > "${myfiles}"/cs46xx.README <<"EOF"
# not included
apt install alsa-utils
tar xvf alsa-firmware-1.2.4.tar.bz2
cd alsa-firmware-1.2.4/cs46xx
mkdir /lib/firmware/cs46xx
cp ba1 cwc4630 cwcasync cwcbinhack cwcdma cwcsnoop /lib/firmware/cs46xx
modprobe -r snd-cs46xx
modprobe snd-cs46xx
adduser yourusername audio
alsamixer : demute
aplay /usr/share/sounds/alsa/Noise.wav
speaker-test -t sine -f 440 -c 2
speaker-test -t wav -c 2
EOF

cat > "${myfiles}"/local-apt-repository.sh <<"EOF"
#!/bin/bash
help()
{
  echo "rsync and local-apt-repository packages are mandatory"
}
if [[ -n $(find "$(pwd)" -name "rsync*deb") ]]
then 
  find "$(pwd)" -name "rsync*deb" -exec dpkg -i {} \;
else
  help
fi
if [[ -n $(find "$(pwd)" -name "local-apt-repository*deb") ]]
then 
  find "$(pwd)" -name "local-apt-repository*deb" -exec dpkg -i {} \;
else
  help
fi
mkdir /srv/local-apt-repository
mkdir /srv/zips
rsync --recursive "$(pwd)"/pool /srv/local-apt-repository/
rsync --recursive "$(pwd)"/firmware /srv/local-apt-repository/
rsync --recursive "$(pwd)"/zips/ /srv/zips
apt update
EOF

cat > "${myfiles}"/README.custom <<"EOF"
You can add package under <cdrom> or <disk> with dpkg e.g.
# find /mnt/cdrom0 -name "rsync*.deb" -exec dpkg -i {} \;
But you have to install dependencies one by one as the same method.

The most convenient is to execute :
# mount <installation_device>
# cd <installation_device>
# bash local-apt-repository.sh 

It copy all packages into /srv/local-apt-repository and populate apt with all package
Check you have enough space on /srv before (size of the disk/iso).

Start the systemd service
# systemctl start local-apt-repository.service
Check after one or two minutes with
# apt list
And you can install them
# apt install tmux
EOF

if ask "customize installer (add preseed and modify installation option) ?" 
then
  chmod -R +w "${temp_dir}"
  cp -v /tmp/preseed.cfg "${temp_dir}"/preseed.cfg
#  sed -e "s#quiet#priority=high locale=fr_FR.UTF-8 keymap=fr file=/cdrom/preseed.cfg#" ${temp_dir}/isolinux/txt.cfg
#  sed -i -e "s#quiet#priority=high locale=fr_FR.UTF-8 keymap=fr file=/cdrom/preseed.cfg#" ${temp_dir}/isolinux/txt.cfg
  sed -e "s#quiet#file=/cdrom/preseed.cfg#" "${temp_dir}"/isolinux/txt.cfg
  sed -i -e "s#quiet#file=/cdrom/preseed.cfg#" "${temp_dir}"/isolinux/txt.cfg
fi

rsync --dry-run --verbose --recursive "${myfiles}"/ "${temp_dir}"
if ask "copy additionnal packages ?" 
then
  rsync --verbose --recursive "${myfiles}"/ "${temp_dir}"
#  echo "Generate Release file"
#  apt-ftparchive \
#  -o "APT::FTPArchive::Release::Origin=local-apt-repository" \
#  -o "APT::FTPArchive::Release::Description=Local APT repository" \
#  release ${custom_dir} > ${custom_dir}/Release
fi

# Final steps
# Calculate md5 and generate iso

echo "calculate md5sum.txt"
chmod +w "${temp_dir}"/md5sum.txt
cd "${temp_dir}" && find . -follow -type f ! -name "md5sum.txt" -print0 | xargs -0 md5sum > md5sum.txt
chmod -R -w "${temp_dir}"

cd "${HOME}" || exit 1

if ask "generate final iso ?" 
then
  xorriso -as mkisofs -o "${newrelease_iso}" \
    -isohybrid-mbr /usr/lib/ISOLINUX/isohdpfx.bin \
    -c isolinux/boot.cat -b isolinux/isolinux.bin -no-emul-boot \
    -boot-load-size 4 -boot-info-table "${temp_dir}"
fi

echo "=== End of script ==="
exit 0