USB shell login and ADTPro server daemon support for Jessie

setup/ttyusbhandler.txt

@@ -35,11 +35,27 @@ elif [[ $1 == "add" ]]; then
         touch /tmp/udev-ttyUSBlower-added
         pkill -f "[A]DTPro"
         pkill -f "[u]sbgetty"
-        exec /usr/local/adtpro/adtpro.sh headless serial
+        exec echo "/usr/local/adtpro/adtpro.sh headless serial" | at -M now
     else # ttyUSBupper
         rm /tmp/udev-ttyUSBupper-added &> /dev/null
         touch /tmp/udev-ttyUSBupper-added
         pkill -f "[g]etty.*ttyUSB"
+        if [[ -f /bin/systemctl ]]; then # if systemd
+            # if USB-to-serial adapter is directly attached to upper port
+            if [[ -c /dev/ttyUSBupper ]]; then
+                ttyUSB=ttyUSBupper
+            # if hub in upper port, use highest numbered port on hub
+            elif [[ $(ls -1 /dev/ttyUSBupper_hub* 2> /dev/null | wc -l) -gt 0 ]]; then
+                ttyUSB=$(ls -1 /dev/ttyUSBupper_hub* 2> /dev/null | tail -1 | cut -c 6-)
+            # if hub in lower port with multiple adapters, use highest numbered port on hub
+            elif [[ $(ls -1 /dev/ttyUSBlower_hub* 2> /dev/null | wc -l) -gt 1 ]]; then
+                ttyUSB=$(ls -1 /dev/ttyUSBlower_hub* 2> /dev/null | tail -1 | cut -c 6-)
+            else
+            # by definition, this shouldn't happen
+                ttyUSB=
+            fi
+            exec systemctl restart usbgetty@$ttyUSB
+        fi
     fi
 else
     exit 2

setup/usbgetty-systemd.service.txt

@@ -0,0 +1,42 @@
+#  This file is part of systemd.
+#
+#  systemd is free software; you can redistribute it and/or modify it
+#  under the terms of the GNU Lesser General Public License as published by
+#  the Free Software Foundation; either version 2.1 of the License, or
+#  (at your option) any later version.
+
+# This file is adapted for A2CLOUD. It to be called usbgetty@.service
+# and needs to be placed in /etc/systemd/system/getty.target.wants/
+# Symlinks pointing to it need to be in place for every serial port
+# defined in /etc/udev/rules.d/50-usb.rules, e.g.
+# usbgetty@ttyUSBupper.service -> usbgetty@.service
+
+[Unit]
+Description=Serial Getty on %I
+Documentation=man:agetty(8) man:systemd-getty-generator(8)
+Documentation=http://0pointer.de/blog/projects/serial-console.html
+BindsTo=dev-%i.device
+After=dev-%i.device systemd-user-sessions.service plymouth-quit-wait.service
+After=rc-local.service
+
+# If additional gettys are spawned during boot then we should make
+# sure that this is synchronized before getty.target, even though
+# getty.target didn't actually pull it in.
+Before=getty.target
+IgnoreOnIsolate=yes
+
+[Service]
+#ExecStart=-/sbin/agetty %I 4800 $TERM
+ExecStart=-/usr/local/sbin/usbgetty -h -L -scanttyUSB 4800 vt100
+Type=idle
+Restart=always
+UtmpIdentifier=%I
+TTYPath=/dev/%I
+TTYReset=yes
+TTYVHangup=yes
+KillMode=process
+IgnoreSIGPIPE=no
+SendSIGHUP=yes
+
+[Install]
+WantedBy=getty.target