Fix apt command

diagramme.svg

@@ -7,7 +7,7 @@
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          x="182.77737"
          y="170.53987"
-         id="tspan6454">- commandes systèmes (reboot, extinctions, clign.)</tspan><tspan
+         id="tspan6454">- commandes systèmes (reboot, extinction, clign.)</tspan><tspan
          sodipodi:role="line"
          style="font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-size:4.23333px;font-family:Sans;-inkscape-font-specification:'Sans, Normal';font-variant-ligatures:normal;font-variant-caps:normal;font-variant-numeric:normal;font-variant-east-asian:normal;fill:#000000;stroke:none;stroke-width:1.05833px"
          x="182.77737"
          y="177.96199"
-         id="tspan6470">- synchro fichiers config, medias</tspan><tspan
+         id="tspan464">- synchro fichiers config, medias via http_upload</tspan><tspan
          sodipodi:role="line"
          style="font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-size:4.23333px;font-family:Sans;-inkscape-font-specification:'Sans, Normal';font-variant-ligatures:normal;font-variant-caps:normal;font-variant-numeric:normal;font-variant-east-asian:normal;fill:#000000;stroke:none;stroke-width:1.05833px"
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          x="182.77737"
-         y="189.57613">(rsync ?) : </tspan><tspan
+         y="189.57613">rsync, scp : </tspan><tspan
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          x="182.77737"

linux_server_deploy.sh

@@ -99,8 +99,8 @@ fi
 REMOTE_MEDIA_DIR="$ROOTFS_MOUNT/home/$PI_USER/Videos"
 # WIFI AP config
 IP_RANGE="10.42.0.1"
-SSID="omen"
+SSID="foo"
-PASSWD="EpQmSmXH123"
+PASSWD="bar"
 IFW="wlo1"
 #Band (bg = 2.4Ghz, a= 5Ghz)
 BAND="bg"

prepa_rpios.md

@@ -43,6 +43,10 @@ echo 'options brcmfmac roamoff=1 feature_disable=0x82000' | sudo tee /etc/modpro
 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
@@ -176,9 +180,11 @@ echo -e "
 ## Limiter le nombre de paquets installés par APT
 
 ```
-echo -e "APT::Get::Install-Recommends "false";\nAPT::Get::Install-Suggests "false";" | sudo tee -a /etc/apt/apt.conf
+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
@@ -186,7 +192,7 @@ echo -e "APT::Get::Install-Recommends "false";\nAPT::Get::Install-Suggests "fals
 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 consoleblank=1
+console=tty3 loglevel=3 vt.global_cursor_default=0 logo.nologo quiet consoleblank=1
 ```
 
 ### Login silencieux
@@ -674,3 +680,304 @@ 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](https://en.wikipedia.org/wiki/Human_interface_device) (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:
+
+  1. [Udev](https://wiki.archlinux.org/title/Udev) rules are triggered when the USB device is plugged/unplugged to create a file in '/tmp' named '.vlc_gui'.
+  2. A systemd [user](https://wiki.archlinux.org/title/Systemd/User) service starts a script on startup.
+  3. This script uses [inotifywait](https://man.archlinux.org/man/inotifywait.1) to monitor a file's creation/deletion in the '/tmp' folder, and act accordingly;
+  4. Start/close a minimal graphical environment with [openbox](http://openbox.org/) running [VLC](https://videolan.org).
+
+## 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](https://www.freedesktop.org/software/systemd/man/udev.html#Operators) ":=" for "MODE"; it makes shure this won't be changed by another rule.  
+
+[Udev rules order read](https://forums.opensuse.org/t/udev-rules-priority-disallow-change-by-other-rules-with-operator/100210)  
+
+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](https://wiki.archlinux.org/title/systemd/User) in '~/.config/systemd/user/', e.g : 
+
+`nano ~/.config/systemd/user/vlc_gui.service`
+
+```yaml
+[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](https://www.freedesktop.org/software/systemd/man/systemd.unit.html#Specifiers)  
+
+### Starting a user unit as root
+
+If running [systemd version >= 248 (2021-03)](https://github.com/systemd/systemd/blob/28795f2c138203fb700fc394f0937708af886116/NEWS#L2809), you can [start a user unit as root](https://www.freedesktop.org/software/systemd/man/systemctl.html#-M), 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' :
+
+```bash
+#!/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" :   
+```bash
+#!/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' :
+```bash
+#!/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\>](http://openbox.org/wiki/Help:Applications) section of '~/.config/openbox/rc.xml', l.656, add:  
+
+```markup
+    <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/](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' :
+```[Unit]
+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
+```