50 lines
1.6 KiB
Bash
Executable File
50 lines
1.6 KiB
Bash
Executable File
#! /bin/bash
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# vim: set tabstop=4 shiftwidth=4 noexpandtab filetype=sh:
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# usbgetty.sh - a2cloud script to start a getty on a USB serial devie (to be replaced.)
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#
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# To the extent possible under law, T. Joseph Carter and Ivan Drucker have
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# waived all copyright and related or neighboring rights to the a2cloud
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# scripts themselves. Software used or installed by these scripts is subject
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# to other licenses. This work is published from the United States.
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ttyUSB=
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pkill -f "sleep 86399"
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if [[ $(grep -e '-scanttyUSB' <<< "$*") ]]; then
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# called with -scantty isntead of device name?
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# if upper USB port
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if [[ -c /dev/ttyUSBupper ]]; then
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ttyUSB=ttyUSBupper
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# if hub in upper port, use highest numbered port on hub
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elif [[ $(ls -1 /dev/ttyUSBupper_hub* 2> /dev/null | wc -l) -gt 0 ]]; then
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ttyUSB=$(ls -1 /dev/ttyUSBupper_hub* 2> /dev/null | tail -1 | cut -c 6-)
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# if hub in lower port with multiple adapters, use highest numbered port on hub
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elif [[ $(ls -1 /dev/ttyUSBlower_hub* 2> /dev/null | wc -l) -gt 1 ]]; then
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ttyUSB=$(ls -1 /dev/ttyUSBlower_hub* 2> /dev/null | tail -1 | cut -c 6-)
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# no port found eligible for getty
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else
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sleep 86399
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fi
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elif [[ $(grep -o 'ttyUSB[^ ]*' <<< "$*") ]]; then
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# if specified USB device name is found
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ttyUSB=$(grep -o 'ttyUSB[^ ]*' <<< "$*")
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else
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sleep 86399
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fi
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if [[ -c /dev/$ttyUSB && ! $(ps aux | grep "[g]etty.*$ttyUSB") ]]; then
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# if adapter seems to exist and doesn't already have a getty,
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# kill all USB gettys and start the getty, otherwise do nothing
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pkill -f "/sbin/getty.*ttyUSB"
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exec /sbin/getty $(sed "s/-scanttyUSB/$ttyUSB/" <<< "$@");
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else
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sleep 86399
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fi
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