26 KiB

Raw Permalink Blame History

Préparation de l'image RPI videopi

Raspi OS et SSH

Télécharger l'image disque version "Legacy" lite : https://downloads.raspberrypi.org/raspios_oldstable_lite_armhf/images/raspios_oldstable_lite_armhf-2022-09-26/2022-09-22-raspios-buster-armhf-lite.img.xz
Flasher l'image sur une carte SD : xzcat 2022-09-22-raspios-buster-armhf-lite.img.xz | sudo dd of=/dev/mmcblkp0 bs=128K oflag=dsync status=progress && sync
Monter la carte SD et ajouter un fichier nommé ssh sur la partition /boot pour activer le serveur SSH; touch boot/ssh (https://linuxhint.com/rasperberry_pi_wifi_wpa_supplicant/)
Toujours sur la partition /boot, créer un fichier nommé wpa_supplicant.conf pour configurer la connexion wifi. Le contenu de celui-ci :

ctrl_interface=DIR=/var/run/wpa_supplicant GROUP=netdev
update_config=1
country=FR

network={
    ssid="BLAH" # Nom du réseau auquel on se connecte
    #scan_ssid=1 # Décommenter si le réseau est caché
    psk="BLAH" # Mot de passe wifi
    # Pour accélérer la découverte et la connexion du point d'accès wifi, 
    # on peut spécifier les fréquences à balayer en fonction du canal utilisé par ce dernier.
    # https://w1.fi/cgit/hostap/tree/wpa_supplicant/wpa_supplicant.conf#n910
    # Wifi 2.4 Ghz : https://fr.wikipedia.org/wiki/Liste_des_canaux_Wi-Fi#Bande_2,4_GHz
    # scan_freq=2412 2437 2462
    # See nmcli 802-11-wireless.channel
    # https://developer-old.gnome.org/NetworkManager/stable/settings-802-11-wireless.html
    # Wifi 5ghz : https://fr.wikipedia.org/wiki/Liste_des_canaux_Wi-Fi#Liste_des_canaux_dans_la_bande_des_5_GHz
    # scan_freq= 5805
}

Insérer la carte dans le RPI et démarrer le système.
Se connecter via SSH.
Adduser pil

Options du pilote brcmfmac pour le wifi intégré des rpi 3+/4

Voir ici : https://wiki.arthus.net/?Rpi_wifi_-_BCM4345_and_CTRL-EVENT-ASSOC-REJECT

echo 'options brcmfmac roamoff=1 feature_disable=0x82000' | sudo tee /etc/modprobe.d/brcmfmac.conf

Modification de config.txt

Ajouter les lignes suivantes au fichier /boot/config.txt :


#hdmi_force_hotplug=1
#hdmi_drive=2

# Forcer HDMI Full HD
hdmi_group=1
hdmi_mode=16 # fullHD@60

[all]
# Désactivation du bluetooth
dtoverlay=disable-bt
max_framebuffers=2
# Désactiver le logo éclair et l'arc en ciel au démarrage
boot_delay=1
avoid_warnings=1
disable_splash=1

Activation du pilote GPU libre pour le décodage vidéo matériel

Ajouter à '/boot/config.txt' :

dtoverlay=vc4-kms-v3d

Utilisation gpu

vcgencmd get_mem <type>

Where type is:

arm: total memory assigned to arm
gpu: total memory assigned to gpu
malloc_total: total memory assigned to gpu malloc heap
malloc: free gpu memory in malloc heap
reloc_total: total memory assigned to gpu relocatable heap
reloc: free gpu memory in relocatable heap

Overclocking


# SD card reader OC (expect 20% rio improvement)
# https://www.pidramble.com/wiki/benchmarks/microsd-cards
# Samsung Pro/Evo+ is recommended
# default value : 50
# value needs to be an int divisor of core_freq
# NEEDS A UHS-1/Class10 SD CARD !
# dtparam=sd_overclock=84
# to check value in os : cat /sys/kernel/debug/mmc0/ios

[pi4]
# Run as fast as firmware / board allows
arm_boost=1
dtoverlay=disable-bt
dtoverlay=vc4-kms-v3d
max_framebuffers=2

# Apply to rpi3, rpi3+, cm3
[pi3]
# Safe OC values
# gpu_freq : Sets core_freq, h264_freq, isp_freq, v3d_freq and hevc_freq together
# default values :
# arm_freq 1200
# gpu_freq 400
# sdram_freq 450
arm_freq=1300
gpu_freq=462
sdram_freq=500
over_voltage=3
dtparam=sd_overclock=66
# Disable bluetooth
dtoverlay=disable-bt
#dtoverlay=disable-wifi
# Enable DRM VC4 V3D driver
dtoverlay=vc4-kms-v3d
max_framebuffers=2
gpu_mem=64

# Override OC values for 3+ models
[pi3+]
# Defaults values : 
# arm_freq 1400
# core_freq 400
# gpu_freq 400
# sdram_freq 500
arm_freq=1500
sdram_freq=550

[pi1]
# Defaults values : 
# arm_freq 700
# core_freq 250
# sdram_freq 400
arm_freq=950
core_freq=300
sdram_freq=500
over_voltage=6
gpu_mem=128 

[all]
# Forcer HDMI Full HD
hdmi_group=1
hdmi_mode=16 # fullHD@60
# Désactiver le logo éclair et l'arc en ciel au démarrage
boot_delay=1
avoid_warnings=1
disable_splash=1

Configuration du Wifi

echo -e "
    ctrl_interface=DIR=/var/run/wpa_supplicant GROUP=netdev\n
    update_config=1\n
    country=FR\n
    \n
    network={\n
        ssid="BLAH" # Nom du réseau auquel on se connecte\n
        #scan_ssid=1 # hidden ssid \n
        psk="BLAH" # Mot de passe wifi\n
        # Specify 2.4 or 5G freq\n
        # https://w1.fi/cgit/hostap/tree/wpa_supplicant/wpa_supplicant.conf#n910\n
        # https://fr.wikipedia.org/wiki/Liste_des_canaux_Wi-Fi#Bande_2,4_GHz
        # scan_freq=2412 2437 2462\n
        # See nmcli 802-11-wireless.channel\n
        # https://developer-old.gnome.org/NetworkManager/stable/settings-802-11-wireless.html\n
        # scan_freq= 5805\n
    }\n"
| sudo tee -a /etc/wpa_supplicant/wpa_supplicant.conf

Limiter le nombre de paquets installés par APT

echo -e 'APT::Install-Suggests "0";\nAPT::Install-Recommends "0";' | sudo tee -a /etc/apt/apt.conf.d/80noclutter

Rendre le démarrage du RPI complètement silencieux (écran noir)

cmdline.txt

Editer le fichier /boot/cmdline.txt et ajouter les options suivantes à la fin de la première ligne:

console=tty3 loglevel=3 vt.global_cursor_default=0 logo.nologo quiet consoleblank=1

Lancer les commandes suivantes :

echo "" | sudo tee /etc/issue
echo "" | sudo tee /etc/motd
touch ~/.hushlogin

Editer le fichier /etc/systemd/system/getty@tty1.service.d/autologin.conf et remplacer le contenu par :

[Service]
ExecStart=
ExecStart=-/sbin/agetty --skip-login --noclear --noissue --login-options "-f pil" %I $TERM

Editer le fichier /etc/rc.local et ajouter la ligne suivante juste avant "exit 0" :

setterm -term linux -blank 1 >/dev/tty1

Connexion automatique au démarrage

Lancer la commande raspi-config, puis aller dans "1 System Options", "S5 Boot / Auto login", "B2 Console Auto Login".

Installation des logiciels nécessaires

sudo apt-get update
# min
sudo apt-get install vlc vlc-plugin-base python3-minimal python3-pip nginx file lua5.2 python pip install flask flask-httpauth waitress toml werkzeug ffmpeg ffmpegthumbnailer
# build
# sudo apt-get install vlc git dkms firmware-realtek firmware-iwlwifi firmware-ipw2x00 firmware-atheros raspberrypi-kernel-headers build-essential va-driver-all va-driver vdpau-driver-all

SSH : identification par clés

Sur le serveur régie, générer les clés publiques/privées avec :

# générer une clé sans mot de passe, adapter le nom du fichier
ssh-keygen -t ed25519 -f ~/.ssh/videopiX -N ""
# copier sur le client rpi en adaptant l'IP
SSH_AUTH_SOCK="" ssh-copy-id -i .ssh/videopiX.pub pi@$IP

Désactiver la connexion par login/mdp :

echo "PasswordAuthentication no
ChallengeResponseAuthentication no
UsePAM no" | sudo tee -a /etc/ssh/sshd_config

Sur le serveur régie, éditer le fichier ~/.ssh/config et ajouter à la fin :

# VideoPi
Host 10.42.0.142
  IdentityFile ~/.ssh/
  User pi
Host 10.42.0.135
  IdentityFile ~/.ssh/rpi3
  User pi

Sudoers : commandes systèmes sans mot de passe

/etc/sudoers.d/010_pilpil_nopasswd.conf :

Cmnd_Alias PILPIL=/usr/sbin/reboot, /usr/sbin/poweroff, /usr/bin/tee
pil ALL=(ALL) NOPASSWD: PILPIL

Systemd Unit : démarrage automatique des services

VLC

Créer le fichier .config/systemd/user/vlc.service contenant:

[Unit]
Description=VLC http service

[Service]
WorkingDirectory=/home/pil/
ExecStart=/usr/bin/cvlc --quiet -I http --no-osd --http-password=secret --file-caching=5000
Restart=always

[Install]
WantedBy=multi-user.target

Puis lancer les commandes :

systemctl --user daemon-reload
systemctl --user enable vlc
systemctl --user  start vlc

pilpil

Créer le fichier .config/systemd/user/pilpil.service contenant:

[Unit]
Description=Pilpil Command Server 
After=network.target

[Service]
WorkingDirectory=/home/pil/pilpil-client
#ExecStart=/home/pil/pilpil-client/app.py
ExecStart=/home/pil/.local/bin/waitress-serve --listen=127.0.0.1:5000 app:app
Restart=always

[Install]
WantedBy=multi-user.target

Puis lancer les commandes :

systemctl --user daemon-reload
systemctl --user enable pilpil
systemctl --user  start pilpil

Configuration du serveur régie

Linux : network-manager cli

hotspot()
{

SSID="omen"
PASSWD="EpQmSmXH123"
#Intel
IFW="wlo1"
#Brostrend
#IFW="wlp0s20f0u1"
#Band (bg = 2.4Ghz, a= 5Ghz)
BAND="bg"
#HIDE="802-11-wireless.hidden false"
CHAN="802-11-wireless.channel 1"

if [ "$1" == "off" ];then
        nmcli radio wifi off
        nmcli con delete $SSID
else
	if [ "$1" == "wlp0s20f0u1" ];then
 		IFW="wlp0s20f0u1"
#		IFW="wlp0s20f0u2u4"
#		BAND="a"
#		CHAN="802-11-wireless.channel 161"
	fi

        nmcli con delete $SSID
        nmcli con add type wifi ifname $IFW con-name $SSID autoconnect no ssid $SSID
        nmcli con modify $SSID 802-11-wireless.mode ap 802-11-wireless.band $BAND $CHAN ipv4.method shared
        nmcli con modify $SSID wifi-sec.key-mgmt wpa-psk
        nmcli con modify $SSID 802-11-wireless-security.proto rsn
        nmcli con modify $SSID 802-11-wireless-security.pairwise ccmp
        nmcli con modify $SSID wifi-sec.psk $PASSWD
        nmcli radio wifi on
        nmcli con up $SSID
fi
}

Changer la plage d'IP du hotspot

Une fois la connexion créée, éditer /etc/NetworkManager/system-connections/$SSID.nmconnection et ajouter une directive address1 à la section "[ipv4]":

[ipv4]
method=shared
address1=192.168.125.1/24,192.168.125.1

puis redémarrer networkmanager :

sudo systemctl restart NetworkManager

Supprimer baux dhcp

sudo rm /var/lib/NetworkManager/*.leases

sudo rm /var/lib/NetworkManager/dnsmasq-wlo1.leases

IP fixes des clients

Bail dhcp permanent

sudo nano /etc/NetworkManager/dnsmasq-shared.d/wlo1.conf

log-queries
log-facility=/var/log/dnsmasq.log
#rpi1
dhcp-host=00:e0:4c:18:0a:fa,rpi1,10.42.0.142
#rpi3
dhcp-host=b8:27:eb:12:55:31,rpi3,10.42.0.135

WPA supplicant

Windows setup

Hotspot : netsh

netsh wlan set hostednetwork mode=allow ssid=Hotspot key=ZiZiPass
netsh wlan start hostednetwork

Dependencies

Install wsl/msys2 ; [https://learn.microsoft.com/fr-fr/windows/wsl/install]/[https://www.msys2.org/]
Install openssh, rsync, python-pip :

pacman -S openssh rsync python-pip

Install python deps :

pip install flask waitress toml

Start app with flask run

Win/Linux install

With Docker-compose / Docker desktop:

docker-compose -f docker-compose.yml up

Firewall : port 67

Ouvrir port 67 pour le DHCP

Imaging the OS

From Sd to image

dd bs=256K if=/dev/sda of=BLAH.img status=progress oflag=dsync

Shrink image

sudo pishrink.sh -sZpa BLAH.img

From image to sd

xzcat 2022-07-19-videopi.img.xz | sudo dd of=/dev/sda bs=128K oflag=dsync status=progress && sync

Regenerate SSH hostkeys on first start

sudo ln -s /lib/systemd/system/regenerate_ssh_host_keys.service /mount_point/etc/systemd/system/multi-user.target.wants/regenerate_ssh_host_keys.service

(Optional) Resize FS to fill SD card

Use raspi-config to resize the file system; "Advanced options" > "Expand Filesystem"

Installation

Install python 3.10
Use pip to install flask, waitress :

pip install flask waitress toml

Other :

VLC : local jquery and flowplayer libs

Jquery

Récupérer les librairies jquery sur le system de fichier local dans '/usr/share/vlc/lua/http/js' :

sudo mkdir -p /usr/share/vlc/lua/http/js/ajax/libs/jquery/1.6.1/
sudo mkdir -p /usr/share/vlc/lua/http/js/ajax/libs/jqueryui/1.8.13/
sudo wget -P /usr/share/vlc/lua/http/js/ajax/libs/jquery/1.6.1/ https://ajax.googleapis.com/ajax/libs/jquery/1.6.1/jquery.min.js
sudo wget -P /usr/share/vlc/lua/http/js/ajax/libs/jqueryui/1.8.13/ https://ajax.googleapis.com/ajax/libs/jqueryui/1.8.13/jquery-ui.min.js

Remplacer les liens d'importation dans '/usr/share/vlc/lua/http/index.html', l.40-41 :

		<script type="text/javascript" src="./js/ajax/libs/jquery/1.6.1/jquery.min.js"></script>
		<script type="text/javascript" src="./js/ajax/libs/jqueryui/1.8.13/jquery-ui.min.js"></script>

Flowplayer

sudo mkdir -p /usr/share/vlc/lua/http/js/swf
sudo wget -P /usr/share/vlc/lua/http/js/ https://releases.flowplayer.org/js/flowplayer-3.2.6.min.js
sudo wget -P /usr/share/vlc/lua/http/js/swf https://releases.flowplayer.org/swf/flowplayer-3.2.7.swf

Remplacer les liens d'importation dans '/usr/share/vlc/lua/http/index.html', l.211-213 :

			$.getScript('./js/flowplayer-3.2.6.min.js', function(data, textStatus){
				$('#player').empty();
				flowplayer("player", "./js/swf/flowplayer-3.2.7.swf");

VLC http LUA : ajouter des méthodes

On modifie le fichier httprequests.lua : /usr/lib/arm-linux-gnueabihf/vlc/lua/intf/modules/httprequests.lua

Pour être sur d'avoir la bonne version, apt-get source vlc-plugin-base après avoir décommenté la ligne pour les sources dans /etc/apt/sources.list.

Puis tar -xvf vlc_3.0.17.4.orig.tar.xz vlc-3.0.17.4/share/lua/intf/modules/httprequests.lua.

On compile avec luac en faisant attention à bien utiliser la bonne version de luac ( 5.2 avec VLC-3.0.17.4 au 09-2022 ) :

file /usr/lib/arm-linux-gnueabihf/vlc/lua/intf/modules/httprequests.luac
luac.out: Lua bytecode, version 5.2

luac -v
Lua 5.2  Copyright (C) 1994-2021 Lua.org, PUC-Rio

Ajout ligne 131 :

    elseif command == "pl_move" then
        vlc.playlist.move( id, tonumber(val) or -1 )

Compilation :

luac -o /usr/lib/arm-linux-gnueabihf/vlc/lua/intf/modules/httprequests.luac vlc-3.0.17.4/share/lua/intf/modules/httprequests.lua

https://salsa.debian.org/multimedia-team/vlc

pl_move : Usage

Sample playlist :

<leaf duration="8"   id="3"  ro="rw" uri="file:///home/pi/sangliers_1080.mp4" name="sangliers_1080.mp4"/>
<leaf duration="23"  id="4"  ro="rw" uri="file:///home/pi/tst1.mp4" name="tst1.mp4"/>
<leaf duration="227" id="5"  ro="rw" uri="file:///home/pi/tst.mp4" name="tst.mp4"/>
<leaf duration="8"   id="6"  ro="rw" uri="file:///home/pi/sangliers_1080.mp4" name="sangliers_1080.mp4"/>
<leaf duration="23"  id="7"  ro="rw" uri="file:///home/pi/tst1.mp4" name="tst1.mp4"/>
<leaf duration="227" id="8"  ro="rw" uri="file:///home/pi/tst.mp4" name="tst.mp4"/>

# Move id 3 after id 5
10.42.0.135:8080/requests/status.xml?command=pl_move&id=3&val=5
<node name="Playlist" ro="ro" id="1">
    <leaf duration="23" id="4" ro="rw" uri="file:///home/pi/tst1.mp4" name="tst1.mp4"/>
    <leaf duration="227" id="5" ro="rw" uri="file:///home/pi/tst.mp4" name="tst.mp4"/>
    <leaf duration="8" id="3" ro="rw" uri="file:///home/pi/sangliers_1080.mp4" name="sangliers_1080.mp4"/>
    <leaf duration="8" id="6" ro="rw" uri="file:///home/pi/sangliers_1080.mp4" name="sangliers_1080.mp4"/>
    <leaf duration="23" id="7" ro="rw" uri="file:///home/pi/tst1.mp4" name="tst1.mp4"/>
    <leaf duration="227" id="8" ro="rw" uri="file:///home/pi/tst.mp4" name="tst.mp4"/>
</node>

# Make id 4 first item in list
10.42.0.135:8080/requests/status.xml?command=pl_move&id=4&val=1
Make an array from new playlist, then loop other that from the end

Certbot, Nginx, Waitress

https://dev.to/thetrebelcc/how-to-run-a-flask-app-over-https-using-waitress-and-nginx-2020-235c

sudo apt-get install nginx

/etc/nginx/sites-available/default :

# Cmd server
server {
    listen 8888 ssl;
    ssl_certificate /etc/ssl/certs/nginx-selfsigned.crt;
    ssl_certificate_key /etc/ssl/private/nginx-selfsigned.key;
    location / {
            client_max_body_size 100M; # Max http_upload size
            proxy_pass http://127.0.0.1:5000;
            proxy_set_header X-Real-IP $remote_addr;
        }
}
# VLC server
server {
    listen 8887 ssl;
    ssl_certificate /etc/ssl/certs/nginx-selfsigned.crt;
    ssl_certificate_key /etc/ssl/private/nginx-selfsigned.key;
    location / {
            proxy_pass http://127.0.0.1:5001;
            proxy_set_header X-Real-IP $remote_addr;
    }
}

openssl :

openssl req -new -newkey rsa:4096 -days 1825 -nodes -x509 -subj "/C=/ST=Denial/L=/O=/CN=10.42.0.135" -addext "subjectAltName=10.42.0.135" -keyout "/etc/ssl/private/nginx-selfsigned.key" -out "/etc/ssl/certs/nginx-selfsigned.crt"

Fix nginx startup fail if /var/log/nginx doesn't exists

In '/etc/nginx/mklogdir.sh' :

#!/bin/bash
if [[ ! -d /var/log/nginx ]]
then
    mkdir /var/log/nginx
    systemctl restart nginx
fi

then sudo chmod +x /etc/nginx/mklogdir.sh.

After that, edit the nginx service unit to add a ExecStartPre directive to run the script :

sudo systemctl edit --full nginx.service 

[Service]
Type=forking
PIDFile=/run/nginx.pid
ExecStartPre=/etc/nginx/mklogdir.sh # Add this line

Bash script

#!/bin/bash
PASSWD="secret"
ADDRESSES=("10.42.0.1" "10.42.0.135" "10.42.0.142")
#ADDRESSES1=("10.42.0.1" "10.42.0.135")
#ADDRESSES2=("10.42.0.142")
for ADDR in ${ADDRESSES[@]}
do
    echo "Sending command $1 and $2 to $ADDR..."
    echo -e "$PASSWD\n$1\n$2" | nc "$ADDR" 9999 -w 5 &
#    echo -e "$PASSWD\n$1\n$2" | nc "$ADDR" 9999 -w 5 | sed '/Welcome/d;/VLC/d;/Password/d;' &
#    echo -e "$PASSWD\n$1\n$2" | nc "$ADDR" 9999 > /dev/null &
done
sleep 0.5
for ADDR in ${ADDRESSES[@]}
do
    echo "Sending command $3 and $4 to $ADDR..."
    echo -e "$PASSWD\n$3\n$4" | nc "$ADDR" 9999 > /dev/null &
done

DKMS install

All modules on all kernels :

ls /lib/modules | \
    sudo xargs -n1 /usr/lib/dkms/dkms_autoinstaller start

Specific module on specific kernel :

sudo dkms build -m rtl8821cu -v 5.12.0 -k $kernel_version # rtl8192eu/1.0
sudo dkms install -m rtl8821cu -v 5.12.0 -k $kernel_version # rtl8192eu/1.0
# The module should loaded automatically but just if needed...
sudo modprobe 8821cu # 8192eu

Udev & systemd - Running a graphic environment when a USB device is plugged in

Summary :

At a GNU/Linux console prompt, no GUI. When a USB device of type HID (keyboard/mouse mainly) is plugged in, we want the X server to start and launch VLC's graphical interface, fullscreen, no borders. When this device is removed, VLC is shut down and the X server too, and we end up back at the console prompt.

Proposed solution:

Udev rules are triggered when the USB device is plugged/unplugged to create a file in '/tmp' named '.vlc_gui'.
A systemd user service starts a script on startup.
This script uses inotifywait to monitor a file's creation/deletion in the '/tmp' folder, and act accordingly;
Start/close a minimal graphical environment with openbox running VLC.

1. Udev configuration

Run script on USB HID (mouse/kb) connect

We want a rule that triggers when a device has SUBSYSTEM=="usb" and DRIVER=="usbhid".

In '/etc/udev/rules.d/01-vlc_gui.rules' :

# On plug
ACTION=="add" SUBSYSTEM=="usb", DRIVER=="usbhid", RUN+="/usr/bin/touch /tmp/.vlc_gui"
# On un-plug
ACTION=="remove" SUBSYSTEM=="usb", RUN+="/usr/bin/rm -f /tmp/.vlc_gui"

The rules above create a '.vlc_gui' file in '/tmp' when a usbhid device is plugged in, and removes it when unplugged.

Change read permissions on tty7

By default, permissions on '/dev/tty*' are 0620 (crw--w----). So members of group tty can write, but not read to ttys. This will be a problem for the X server, so we need to change those permissions to have read writes for our group too.

Let's change the permissions on the tty that we need to 0660 (crw-rw----) so that we can run our X session on it.

Inspect how udev sees your TTY (tty7 here):

udevadm info --attribute-walk --path=/sys/class/tty/tty7

looking at device '/devices/virtual/tty/tty7':
    KERNEL=="tty7"
    SUBSYSTEM=="tty"
    DRIVER==""
    ATTR{power/control}=="auto"
    ATTR{power/runtime_active_time}=="0"
    ATTR{power/runtime_status}=="unsupported"
    ATTR{power/runtime_suspended_time}=="0

So we want a rule that matches 'KERNEL=="tty7"' and 'SUBSYSTEM=="tty"' and set it to mode '0660':

SUBSYSTEM=="tty", KERNEL=="tty7", MODE:="0660"

Notice the immutable operator ":=" for "MODE"; it makes shure this won't be changed by another rule.

Udev rules order read

Test which rules are triggered by a specific device with :

udevadm test /class/tty/tty7

Reload and apply the new rules with :

udevadm control --reload-rules
udevadm trigger

Of course, don't forget to add your user to the 'tty' group :

sudo adduser USERNAME tty

On some system, you might have to use usermod :

sudo usermod -a -G tty USERNAME

then log out/in and check with groups that 'tty' appears in the listed groups.

2. Systemd user unit

We can create user units in '~/.config/systemd/user/', e.g :

nano ~/.config/systemd/user/vlc_gui.service

[Unit]
Description=VLC GUI launcher service

[Service]
# %h specifier resolves to user home (~ equivalent)
ExecStart="%h"/vlc_gui.sh
Restart=always

[Install]
WantedBy=default.target

Reload the units with systemctl --user daemon-reload
and start/enable the service with
systemctl --user start vlc_gui.service / systemctl --user enable vlc_gui.service.

More about systemd specifiers:
https://www.freedesktop.org/software/systemd/man/systemd.unit.html#Specifiers

Starting a user unit as root

If running systemd version >= 248 (2021-03), you can start a user unit as root, i.e ;
using sudo systemctl or in a root shell, with e.g:

sudo systemctl --user --machine USERNAME@ start foo.service

On prior versions, you have to use either
su - USERNAME -c 'systemctl --user start foo.service' or
runuser -l USERNAME -c 'systemctl --user start foo.service' instead.

3. inotifywait : watch for a file's creation/deletion

Install the tool :

sudo apt-get install inotify-tools

Create the script :

In '~/vlc_gui.sh' :

#!/usr/bin/env bash

inotifywait -m /tmp -e create -e delete |
while read directory action file; do
    if [[ "$file" == ".vlc_gui" ]]; then 
        if [[ "$action" == "CREATE" ]]; then
            echo "Starting VLC GUI."
            # Start X environment on tty7
            DISPLAY=:0 startx -- vt7 &
        elif [[ "$action" == "DELETE" ]]; then
            echo "Killing VLC GUI"
            pkill vlc
        fi
    fi
done

Don't forget to set execution bit : sudo chmod +x ~/vlc_gui.sh

4. Minimal X environment & Launching VLC

Install the following packages :

sudo apt-get install -y --no-install-recommends --no-install-suggests xinit xserver-xorg xserver-xorg-core xserver-xorg-input-evdev xserver-xorg-input-kbd openbox feh

Xinit config

We start the X environment with startx, which sources "~/.xinitrc".
Let's start openbox session there.

cp /etc/X11/xinit/xinitrc ~/.xinitrc

Then in "~/.xinitrc" :

#!/bin/sh

# /etc/X11/xinit/xinitrc
#
# global xinitrc file, used by all X sessions started by xinit (startx)

# invoke global X session script
. /etc/X11/Xsession
exec openbox-session

Set execution bit :

sudo chmod +x ~/.xinitrc

Openbox configuration

Now Openbox config files are in '~/.config/openbox' and there are two of them :

autostart.sh

In '~/.config/openbox/autostart.sh' :

#!/bin/bash

# Exit openbox when VLC is closed
vlc --vout=gles2 && openbox --exit
# on rpi with 3d kms driver, can be --vout=drm_vout

Set execution bit :

sudo chmod +x ~/.config/openbox/autostart.sh

rc.xml

cp /etc/xdg/openbox/rc.xml ~/.config/openbox/

We want the VLC gui launching fullscreen, with no window decoration. In openbox's <applications> section of '~/.config/openbox/rc.xml', l.656, add:

    <application name="vlc" role="vlc-main">
        <decor>no</decor>
        <maximized>yes</maximized>
    </application>

Troubleshooting

Udev rules

You can increase udev's log verbosity with sudo udevadm control --log-priority=debug
then run journalctl -f to see if an error message comes up when plugging/unplugging the USB HID.

Xserver

You can see what's going on by launching journalctl -f in a SSH session, then plug/unplug the USB HID.
If you encounter an error with the X server complaining about permission to tty7 like this

(EE) xf86OpenConsole: Cannot open virtual console 7 (Permission denied)

try rebooting.

Slow mouse cursor

If you experience laggy mouse cursor movements, you can try adding usbhid.mousepoll=0 to '/boot/cmdline.txt'.

Other values you might want to try are :

value	speed
0	device request
X	1000/X Hz

source: https://peppe8o.com/fixing-slow-mouse-with-raspberry-pi-os/

Systemd unit : run unit every X seconds with timer

/etc/systemd/system/nvlc.service /etc/systemd/system/nvlc.timer

In '.config/systemd/user/nvlc.service' :

[Unit]
Description=VLC Ncurse UI service

[Service]
Type=oneshot
#User=pil
WorkingDirectory=/home/pil/
ExecStart=/home/pil/vlc_gui.sh
#ExecStart=/usr/bin/nvlc -I ncurses --no-osd --file-caching=5000

[Install]
WantedBy=default.target

In '.config/systemd/user/nvlc.timer' :

Description=NVLC test

[Timer]
OnUnitActiveSec=10s
OnBootSec=10s

[Install]
WantedBy=timers.target

then to start timer :

systemctl --user start nvlc.timer

list timers :

systemctl --user list-timers --all

Timedate

To sync time/date , add dns to '/etc/resolv.conf', then

sudo timedatectl

systemd unit :

systemctl status systemd-timesyncd

26 KiB Raw Permalink Blame History

Préparation de l'image RPI videopi

Raspi OS et SSH

Options du pilote brcmfmac pour le wifi intégré des rpi 3+/4

Modification de config.txt

Activation du pilote GPU libre pour le décodage vidéo matériel

Utilisation gpu

Overclocking

Configuration du Wifi

Limiter le nombre de paquets installés par APT

Rendre le démarrage du RPI complètement silencieux (écran noir)

cmdline.txt

Login silencieux

Connexion automatique au démarrage

Installation des logiciels nécessaires

SSH : identification par clés

Sudoers : commandes systèmes sans mot de passe

Systemd Unit : démarrage automatique des services

VLC

pilpil

Configuration du serveur régie

Linux : network-manager cli

Changer la plage d'IP du hotspot

Supprimer baux dhcp

IP fixes des clients

Bail dhcp permanent

WPA supplicant

Windows setup

Hotspot : netsh

Dependencies

Win/Linux install

Firewall : port 67

Imaging the OS

From Sd to image

Shrink image

From image to sd

Regenerate SSH hostkeys on first start

(Optional) Resize FS to fill SD card

Installation

Other :

VLC : local jquery and flowplayer libs

Jquery

Flowplayer

VLC http LUA : ajouter des méthodes

pl_move : Usage

Certbot, Nginx, Waitress

Fix nginx startup fail if /var/log/nginx doesn't exists

Bash script

DKMS install

Udev & systemd - Running a graphic environment when a USB device is plugged in

Summary :

Proposed solution:

1. Udev configuration

Run script on USB HID (mouse/kb) connect

Change read permissions on tty7

2. Systemd user unit

Starting a user unit as root

3. inotifywait : watch for a file's creation/deletion

Install the tool :

Create the script :

4. Minimal X environment & Launching VLC

Xinit config

Openbox configuration

autostart.sh

rc.xml

Troubleshooting

Udev rules

Xserver

Slow mouse cursor

Systemd unit : run unit every X seconds with timer

Timedate

26 KiB

Raw Permalink Blame History