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130 lines
2.7 KiB
130 lines
2.7 KiB
6 years ago
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test
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sudo apt install inotify-tools
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sudo dd if=/dev/zero of=/usbdisk.img bs=1M count=128
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fdisk new primary partition type b
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fdisk -lu /usbdisk.img #=> offset
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losetup -o $((2048*512)) /dev/loop0 /usbdisk.img
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mkfs -t vfat -v /dev/loop0 -n raspberry
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losetup -d /dev/loop0
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sudo modprobe g_mass_storage file=/usbdisk.img stall=0 removable=1 iSerialNumber=1234567890
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(modinfo g_mass_storage)
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mount -o loop,ro,offset=$((2048*512)) -t vfat /usbdisk.img /mnt
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umount /mnt
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sudo modprobe -r g_mass_storage
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echo "dtoverlay=dwc2" >> /boot/config.txt
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echo "g_mass_storage file=/usbdisk.img stall=0 removable=1 iSerialNumber=1234567890" >> /etc/modules
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script:
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#!/bin/bash
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set -e -u
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[ -f /usr/bin/inotifywait ] || apt -y install inotify-tools
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[ -f /usr/bin/fim ] || apt -y install fim
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#tvservice -p
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# tvservice -e "DMT 82"
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# fbset -g 1920 1080 1920 1080 16
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echo "18" > /sys/class/gpio/export || echo "gpio already set up"
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echo "23" > /sys/class/gpio/export || echo "gpio already set up"
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sleep 1
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echo "out" > /sys/class/gpio/gpio18/direction
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echo "0" > /sys/class/gpio/gpio18/value
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echo "out" > /sys/class/gpio/gpio23/direction
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echo "0" > /sys/class/gpio/gpio23/value
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declare -g latest=""
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getnewestfile() {
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#unset -v latest
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shopt -s nullglob
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for f in /mnt/*; do
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[[ "$f" -nt "$latest" ]] && latest="$f"
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done
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echo "$latest"
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}
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cleanup () {
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echo "0" > /sys/class/gpio/gpio18/value
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echo "0" > /sys/class/gpio/gpio23/value
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killall fim
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umount /mnt || echo ""
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modprobe -r g_mass_storage || echo ""
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exit
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}
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trap cleanup INT TERM EXIT
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modprobe g_mass_storage file=/usbdisk.img stall=0 removable=1 iSerialNumber=1234567890
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echo "1" > /sys/class/gpio/gpio18/value
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inotifywait -mq -e modify --format %w%f /usbdisk.img | while read FILE
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do
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echo "1" > /sys/class/gpio/gpio23/value
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echo "new screenshot"
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mount -o loop,ro,offset=$((2048*512)) -t vfat /usbdisk.img /mnt
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latest=$(getnewestfile)
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if [ -n "$latest" ] && [ -f "$latest" ]; then
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killall fim
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cp "$latest" /latestimage
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fim -d /dev/fb0 -T 1 --autozoom --quiet /latestimage &
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fi
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umount /mnt
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echo "0" > /sys/class/gpio/gpio23/value
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done
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examples:
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FILE=/usbdisk.img
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mkdir -p ${FILE/img/d}
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mount -o loop,offset=$((2048*512)) -t vfat $FILE ${FILE/img/d}
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inotifywait -mq -e close_write --format %w%f /usbdisk.img | while read FILE
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do
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echo "Die Datei $FILE wurde modifiziert."
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echo "1" > /sys/class/gpio/gpio23/value
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mount -o loop,ro,offset=$((2048*512)) -t vfat /usbdisk.img /mnt
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umount /mnt
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echo "0" > /sys/class/gpio/gpio23/value
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done
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while inotifywait -e modify /usbdisk.img
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do
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...
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done
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ToDo:
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inotify only once!!
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recreate image on boot
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readonly-root
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python3-pyinotify
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