working alpha version

raspberry-pi/etc/systemd/system/talia-serial-wait.service

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+[Unit]
+Description=Talia SD Serial Wait Service
+
+[Service]
+Type=exec
+ExecStart=/root/scripts/serial-wait.sh
+Restart=on-failure
+RestartSec=5
+
+[Install]
+WantedBy=multi-user.target

raspberry-pi/etc/systemd/system/talia-wait.service

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+[Unit]
+Description=Talia SD Wait Service
+
+[Service]
+ExecStart=/root/scripts/wait.sh
+Restart=on-failure
+RestartSec=60
+
+[Install]
+WantedBy=multi-user.target

raspberry-pi/etc/vsftpd.conf

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+# Example config file /etc/vsftpd.conf
+#
+# The default compiled in settings are fairly paranoid. This sample file
+# loosens things up a bit, to make the ftp daemon more usable.
+# Please see vsftpd.conf.5 for all compiled in defaults.
+#
+# READ THIS: This example file is NOT an exhaustive list of vsftpd options.
+# Please read the vsftpd.conf.5 manual page to get a full idea of vsftpd's
+# capabilities.
+#
+#
+# Run standalone?  vsftpd can run either from an inetd or as a standalone
+# daemon started from an initscript.
+listen=NO
+#
+# This directive enables listening on IPv6 sockets. By default, listening
+# on the IPv6 "any" address (::) will accept connections from both IPv6
+# and IPv4 clients. It is not necessary to listen on *both* IPv4 and IPv6
+# sockets. If you want that (perhaps because you want to listen on specific
+# addresses) then you must run two copies of vsftpd with two configuration
+# files.
+listen_ipv6=YES
+#
+# Allow anonymous FTP? (Disabled by default).
+anonymous_enable=NO
+#
+# Uncomment this to allow local users to log in.
+local_enable=YES
+#
+# Uncomment this to enable any form of FTP write command.
+# talia
+write_enable=YES
+#
+# Default umask for local users is 077. You may wish to change this to 022,
+# if your users expect that (022 is used by most other ftpd's)
+#local_umask=022
+#
+# Uncomment this to allow the anonymous FTP user to upload files. This only
+# has an effect if the above global write enable is activated. Also, you will
+# obviously need to create a directory writable by the FTP user.
+#anon_upload_enable=YES
+#
+# Uncomment this if you want the anonymous FTP user to be able to create
+# new directories.
+#anon_mkdir_write_enable=YES
+#
+# Activate directory messages - messages given to remote users when they
+# go into a certain directory.
+dirmessage_enable=YES
+#
+# If enabled, vsftpd will display directory listings with the time
+# in  your  local  time  zone.  The default is to display GMT. The
+# times returned by the MDTM FTP command are also affected by this
+# option.
+use_localtime=YES
+#
+# Activate logging of uploads/downloads.
+xferlog_enable=YES
+#
+# Make sure PORT transfer connections originate from port 20 (ftp-data).
+connect_from_port_20=YES
+#
+# If you want, you can arrange for uploaded anonymous files to be owned by
+# a different user. Note! Using "root" for uploaded files is not
+# recommended!
+#chown_uploads=YES
+#chown_username=whoever
+#
+# You may override where the log file goes if you like. The default is shown
+# below.
+#xferlog_file=/var/log/vsftpd.log
+#
+# If you want, you can have your log file in standard ftpd xferlog format.
+# Note that the default log file location is /var/log/xferlog in this case.
+#xferlog_std_format=YES
+#
+# You may change the default value for timing out an idle session.
+#idle_session_timeout=600
+#
+# You may change the default value for timing out a data connection.
+#data_connection_timeout=120
+#
+# It is recommended that you define on your system a unique user which the
+# ftp server can use as a totally isolated and unprivileged user.
+#nopriv_user=ftpsecure
+#
+# Enable this and the server will recognise asynchronous ABOR requests. Not
+# recommended for security (the code is non-trivial). Not enabling it,
+# however, may confuse older FTP clients.
+#async_abor_enable=YES
+#
+# By default the server will pretend to allow ASCII mode but in fact ignore
+# the request. Turn on the below options to have the server actually do ASCII
+# mangling on files when in ASCII mode.
+# Beware that on some FTP servers, ASCII support allows a denial of service
+# attack (DoS) via the command "SIZE /big/file" in ASCII mode. vsftpd
+# predicted this attack and has always been safe, reporting the size of the
+# raw file.
+# ASCII mangling is a horrible feature of the protocol.
+#ascii_upload_enable=YES
+#ascii_download_enable=YES
+#
+# You may fully customise the login banner string:
+#ftpd_banner=Welcome to blah FTP service.
+#
+# You may specify a file of disallowed anonymous e-mail addresses. Apparently
+# useful for combatting certain DoS attacks.
+#deny_email_enable=YES
+# (default follows)
+#banned_email_file=/etc/vsftpd.banned_emails
+#
+# You may restrict local users to their home directories.  See the FAQ for
+# the possible risks in this before using chroot_local_user or
+# chroot_list_enable below.
+#chroot_local_user=YES
+#
+# You may specify an explicit list of local users to chroot() to their home
+# directory. If chroot_local_user is YES, then this list becomes a list of
+# users to NOT chroot().
+# (Warning! chroot'ing can be very dangerous. If using chroot, make sure that
+# the user does not have write access to the top level directory within the
+# chroot)
+#chroot_local_user=YES
+#chroot_list_enable=YES
+# (default follows)
+#chroot_list_file=/etc/vsftpd.chroot_list
+#
+# You may activate the "-R" option to the builtin ls. This is disabled by
+# default to avoid remote users being able to cause excessive I/O on large
+# sites. However, some broken FTP clients such as "ncftp" and "mirror" assume
+# the presence of the "-R" option, so there is a strong case for enabling it.
+#ls_recurse_enable=YES
+#
+# Customization
+#
+# Some of vsftpd's settings don't fit the filesystem layout by
+# default.
+#
+# This option should be the name of a directory which is empty.  Also, the
+# directory should not be writable by the ftp user. This directory is used
+# as a secure chroot() jail at times vsftpd does not require filesystem
+# access.
+secure_chroot_dir=/var/run/vsftpd/empty
+#
+# This string is the name of the PAM service vsftpd will use.
+pam_service_name=vsftpd
+#
+# This option specifies the location of the RSA certificate to use for SSL
+# encrypted connections.
+rsa_cert_file=/etc/ssl/certs/ssl-cert-snakeoil.pem
+rsa_private_key_file=/etc/ssl/private/ssl-cert-snakeoil.key
+ssl_enable=NO
+
+#
+# Uncomment this to indicate that vsftpd use a utf8 filesystem.
+#utf8_filesystem=YES

raspberry-pi/readme

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+# install raspberry-pi os
+# debian 13 trixie
+# https://www.raspberrypi.com/documentation/computers/getting-started.html#imager-install
+
+# pi as usb storage
+echo '# Enable USB OTG
+dtoverlay=dwc2' >> /boot/firmware/config.txt
+echo 'dwc2
+g_mass_storage' > /etc/modules-load.d/talia.conf
+
+dd if=/dev/zero of=/usb_share.img bs=1M count=8192
+mkfs.ext4 /usb_share.img
+mkdir /mnt/usb_share
+
+# packages
+apt install vsftpd inotify-tools
+
+# enable service
+systemctl enable talia-wait.service
+systemctl start talia-wait.service

raspberry-pi/root/scripts/expose_usb.sh

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+#!/bin/bash
+modprobe libcomposite
+cd /sys/kernel/config/usb_gadget/
+mkdir -p g1 && cd g1
+
+# Standard USB descriptors
+echo 0x1d6b > idVendor
+echo 0x0104 > idProduct
+echo 0x0100 > bcdDevice
+echo 0x0200 > bcdUSB
+
+mkdir -p strings/0x409
+echo "TALIA003512M" > strings/0x409/serialnumber
+echo "Debian" > strings/0x409/manufacturer
+echo "EmulatedDrive" > strings/0x409/product
+
+mkdir -p configs/c.1/strings/0x409
+echo "Storage and Serial" > configs/c.1/strings/0x409/configuration
+echo 500 > configs/c.1/MaxPower
+
+mkdir -p functions/mass_storage.usb0
+echo 1 > functions/mass_storage.usb0/stall
+echo 1 > functions/mass_storage.usb0/lun.0/removable
+# CRITICAL: Forces target PC to treat it as Read-Only
+echo 1 > functions/mass_storage.usb0/lun.0/ro 
+
+echo /usb_share.img > functions/mass_storage.usb0/lun.0/file
+ln -sf functions/mass_storage.usb0 configs/c.1/
+
+# Serial connection
+mkdir -p functions/acm.usb0
+ln -sf functions/acm.usb0 configs/c.1/
+
+# Bind to the physical controller to make it appear on the reading PC
+echo $(ls /sys/class/udc/) > UDC

raspberry-pi/root/scripts/serial-wait.sh

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+#!/bin/bash
+
+SERIAL_PORT="/dev/ttyGS0"
+stty -F "$SERIAL_PORT" raw
+
+while true
+do
+    if read -r line < "$SERIAL_PORT"
+    then
+        # wait for done message
+        if [ "$line" = "DONE" ]
+        then
+            echo "" > /sys/kernel/config/usb_gadget/g1/UDC
+            exit
+        fi
+    fi
+    sleep 0.5
+done

raspberry-pi/root/scripts/wait.sh

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+#!/bin/bash
+
+SERIAL_PORT="/dev/ttyGS0"
+USB_FILE="/usb_share.img"
+USB_MOUNT="/mnt/usb_share/"
+LOCAL_DIR="/var/local/talia/"
+FTP_DIR="/home/birikim/out/"
+
+while sleep 3
+do
+    if [ -z "$(cat /sys/kernel/config/usb_gadget/g1/UDC)" ] && \
+       [ -n "$(ls -A $FTP_DIR)" ]
+    then
+        mount $USB_FILE $USB_MOUNT
+        rm -rf $USB_MOUNT/talia-sd
+        mkdir $USB_MOUNT/talia-sd
+
+        # wait writes to be completed
+        while inotifywait -t 60 -r -e close_write -e moved_to "$FTP_DIR"
+        do
+            true
+        done
+
+        # lock dir and mv files to USB storage
+        chown -R root:root $FTP_DIR
+        cd $FTP_DIR
+        for i in $(ls -A $FTP_DIR)
+        do
+            mv "$i" $USB_MOUNT/talia-sd/
+        done
+        chown -R birikim:birikim $FTP_DIR
+        cd $USB_MOUNT/talia-sd/
+        # md5sum
+        find -type f -exec md5sum {} \; > /tmp/talia-md5sum.txt
+        sed -i "s/.\///" /tmp/talia-md5sum.txt
+        cd /tmp
+        mv talia-md5sum.txt $USB_MOUNT/talia-sd/
+        umount $USB_MOUNT
+
+        # expose USB storage
+        /root/scripts/expose_usb.sh
+        # wait serial
+        systemctl start talia-serial-wait.service
+    fi
+done