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Created Create devterm cm3 os image from scratch (markdown)

GNU 2021-09-02 12:12:03 +08:00
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## Intro
The image based on raspberry pi os
and it is better to run a Ubuntu 21.04 in a VirtualBox to do all the jobs
The entire operation requires a certain experience in linux
be careful
```
wget https://downloads.raspberrypi.org/raspios_full_armhf/images/raspios_full_armhf-2021-05-28/2021-05-07-raspios-buster-armhf-full.zip
unzip 2021-05-07-raspios-buster-armhf-full.zip
sudo losetup -P /dev/loop0 2021-05-07-raspios-buster-armhf-full.img
sudo mount /dev/loop0p2 /mnt/p2
sudo mount /dev/loop0p1 /mnt/p2/boot
cd /mnt/p2
sudo mount --bind /dev dev/
sudo mount --bind /sys sys/
sudo mount --bind /proc proc/
sudo mount --bind /dev/pts dev/pts
sudo mv etc/ld.so.preload etc/ld_so_preload
sudo chroot .
```
## Inside chroot
```
wget -O - https://raw.githubusercontent.com/clockworkpi/apt/main/debian/KEY.gpg | sudo apt-key add -
echo "deb https://raw.githubusercontent.com/clockworkpi/apt/main/debian/ stable main" | sudo tee -a /etc/apt/sources.list.d/clockworkpi.list
sudo apt update && sudo apt install devterm-thermal-printer devterm-keyboard-firmware devterm-fan-temp-daemon-rpi devterm-thermal-printer-cups devterm-kernel-rpi devterm-audio-patch -y
```
**Config xrandr**
```
sudo bash -c 'cat << EOF > etc/X11/Xsession.d/100custom_xrandr
xrandr --output DSI-1 --rotate right
EOF'
```
**config lightdm**
`/etc/lightdm/lightdm.conf`
`greeter-setup-script=/etc/lightdm/setup.sh`
```
sudo bash -c 'cat <<EOF >/etc/lightdm/setup.sh
#!/bin/bash
xrandr --output DSI-1 --rotate right
exit 0
EOF'
```
`sudo chmod +x /etc/lightdm/setup.sh`
**Modify /etc/dphys-swapfile**
```
CONF_SWAPSIZE=512
```
**Change the default wallpaper**
The following files changed
* /etc/xdg/pcmanfm/LXDE-pi/desktop-items-0.conf
* /etc/xdg/pcmanfm/LXDE-pi/desktop-items-1.conf
* /etc/lightdm/pi-greeter.conf
* /home/pi/.config/pcmanfm/LXDE-pi/desktop-items-0.conf
*
Delete wallpaper address temple.jpg
Modify the desktop_bg color to #202020
change /etc/hostname to clockworkpi
in /boot/cmdline.txt ,add fbcon=rotate:1, remove quiet
### Now quit the chroot env
```
exit
sudo mv etc/ld_so_preload etc/ld.so.preload
sudo umount /mnt/p2/dev/pts
sudo umount /mnt/p2/dev
sudo umount /mnt/p2/proc
sudo umount /mnt/p2/sys
##clear bash
sudo rm -rf root/.bash_history
sudo rm usr/bin/qemu-arm-static
cd -
sudo umount /mnt/p2/
sudo umount /mnt/p1
```
### Flash the image to SD card
* Linux
`sudo dd if=2021-05-07-raspios-buster-armhf-full.img of=/dev/sdX bs=8M status=progress`