#!/bin/sh
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# Copyright (C) 2014 Intel Corporation
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#
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# SPDX-License-Identifier: MIT
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#
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if [ "$1" = "" -o "$1" = "--help" ] ; then
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echo "Usage: $0 <serial terminal command>"
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echo
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echo "Simple script to handle maintaining a terminal for serial devices that"
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echo "disappear when a device is powered down or reset, such as the USB"
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echo "serial console on the original BeagleBone (white version)."
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echo
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echo "e.g. $0 picocom -b 115200 /dev/ttyUSB0"
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echo
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exit
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fi
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args="$@"
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DEVICE=""
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while [ "$1" != "" ]; do
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case "$1" in
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/dev/*)
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DEVICE=$1
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break;;
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esac
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shift
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done
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if [ "$DEVICE" != "" ] ; then
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while true; do
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if [ ! -e $DEVICE ] ; then
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echo "serdevtry: waiting for $DEVICE to exist..."
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while [ ! -e $DEVICE ]; do
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sleep 0.1
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done
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fi
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if [ ! -w $DEVICE ] ; then
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# Sometimes (presumably because of a race with udev) we get to
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# the device before its permissions have been set up
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RETRYNUM=0
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while [ ! -w $DEVICE ]; do
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if [ "$RETRYNUM" = "2" ] ; then
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echo "Device $DEVICE exists but is not writable!"
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exit 1
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fi
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RETRYNUM=$((RETRYNUM+1))
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sleep 0.1
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done
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fi
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$args
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if [ -e $DEVICE ] ; then
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break
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fi
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done
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else
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echo "Unable to determine device node from command: $args"
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exit 1
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fi
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