# Derived 
https://github.com/grotius-cnc/debian_distro_live_build_post_tweaking/blob/main/create-linux-pro-step-0.md

# Install tools
```bash
    sudo apt update && sudo apt install squashfs-tools
```

# Download a .iso file you want to modify.
https://cdimage.debian.org/debian-cd/current-live/amd64/iso-hybrid/debian-live-12.10.0-amd64-lxqt.iso

# Extract the iso files into a directory : media/iso
```bash
    sudo su
    mkdir /media/iso
    cd /media/iso
    7z x debian-live-12.10.0-amd64-lxqt.iso
```

# Extract filesystem.squashfs in /extracted_iso/live directory.
```bash
    cd /media/iso/live 
    unsquashfs filesystem.squashfs  -> Parallel unsquashfs: Using 4 processors
    - Remove original filesystem.
    rm filesystem.squashfs
```

```bash
    Terminal output :
    Parallel unsquashfs: Using 4 processors
    349017 inodes (316588 blocks) to write
    
    [=================================================|] 665605/665605 100%
    
    created 276619 files
    created 14577 directories
    created 71857 symlinks
    created 8 devices
    created 0 fifos
    created 0 sockets
    created 533 hardlinks
```

rm filesystem.squashfs			-> Remove original filesystem.
			
# Mount
```bash
    cd /media/iso/live 
    sudo su
    mount --bind /proc squashfs-root/proc
    mount --bind /sys squashfs-root/sys
    mount --bind /dev squashfs-root/dev
    mount --bind /dev/pts squashfs-root/dev/pts  
    chroot squashfs-root
    export PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
    export LC_ALL=C
    dhclient
```

# The sources list has to be modifies. 
```bash
    nano /etc/apt/sources.list
```
* Remove the first line : deb [trusted=yes] file:/run/live/medium bookworm main non-free-firmware
* Keep these as is:
```bash
    deb http://deb.debian.org/debian/ bookworm main non-free-firmware
    deb-src http://deb.debian.org/debian/ bookworm main non-free-firmware
```
* close nano and save.

```bash
    apt update   -> this should work now.
```

# Check the kernel of chroot environment.
```bash
    dpkg -l | grep linux-image
```
	ii  linux-image-6.1.0-32-amd64           
	ii  linux-image-amd64                 

# Install rt kernel & headers in chroot environment.
```bash
    apt install linux-image-6.1.0-32-rt-amd64
    apt install linux-headers-6.1.0-32-rt-amd64   -> /lib/modules/6.1.0-32-rt-amd64/build
    update-initramfs -u 
```
# Now restart pc and also install the same kernel on local machine.
```bash
    sudo apt install linux-image-6.1.0-32-rt-amd64
    sudo apt install linux-headers-6.1.0-32-rt-amd64
    update-initramfs -u 
```
- At this stage i id did local ethercat-master clone first, and it compiled & installed ok.

# Remount into chroot environment.
Perform the step: # Mount

# Install ethercat-master
```bash
    cd /opt/
    apt install git autoconf libtool automake pkg-config
    git clone https://codeberg.org/skynet/ethercat-master.git
    cd ehtercat-master
    ./bootstrap
    ./configure
    make all modules
    make modules_install install
    depmod
    
    - Copy config file.
    cd /opt/ethercat-master/script/sysconig
    cp ethercat /etc/sysconfig/
    
    - Copy startup script and set as executable.
    cd /opt/ethercat-master/script/init.d
    cp ethercat.in /etc/init.d/
    chmod +x /etc/init.d/ethercat.in
    
    - Copy set mac adress script to /usr/local/bin/
    cd /opt/ethercat-master/script/
    cp set_ethercat_config.sh /usr/local/bin/
    
    echo KERNEL==\"EtherCAT[0-9]*\", MODE=\"0777\" > /etc/udev/rules.d/99-EtherCAT.rules

```

# Install linuxcnc_scurve_compact
```bash
   cd /opt/
   apt install libceres-dev cmake
   git clone --recurse-submodules https://codeberg.org/skynet/linuxcnc_scurve_compact linuxcnc
   cd linuxcnc/cmake
   ./patch
   ./installer
```

# Install linuxcnc-ethercat
```bash
   cd /opt/
   git clone https://codeberg.org/skynet/linuxcnc-ethercat.git
   cd linuxcnc-ethercat
   mkdir build
   cd build
   cmake ..

```

# Install hal-cia402
```bash
   cd /opt/
   git clone https://codeberg.org/skynet/hal-cia402.git
   cd linuxcnc/scripts
   . ./rip-environment
   halcompile --install ../../hal-cia402/cia402.comp
```

# Install user requests
   apt install geany wine
   sudo apt install qtcreator
   sudo apt install simplescreenrecorder
   
# Set crontab startup script.

    crontab -e
    - Add line at end:
    @reboot /usr/local/bin/set_ethercat_config.sh

# Repack to iso file.

   Without chroot environment. Restart pc.
   cd /media/iso/live
   sudo su
   mksquashfs squashfs-root/ filesystem.squashfs -comp xz