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| -rwxr-xr-x | scripts/contrib/serdevtry | 60 |
1 files changed, 60 insertions, 0 deletions
diff --git a/scripts/contrib/serdevtry b/scripts/contrib/serdevtry new file mode 100755 index 0000000000..74bd7b7161 --- /dev/null +++ b/scripts/contrib/serdevtry @@ -0,0 +1,60 @@ +#!/bin/sh + +# Copyright (C) 2014 Intel Corporation +# +# Released under the MIT license (see COPYING.MIT) + +if [ "$1" = "" -o "$1" = "--help" ] ; then + echo "Usage: $0 <serial terminal command>" + echo + echo "Simple script to handle maintaining a terminal for serial devices that" + echo "disappear when a device is powered down or reset, such as the USB" + echo "serial console on the original BeagleBone (white version)." + echo + echo "e.g. $0 picocom -b 115200 /dev/ttyUSB0" + echo + exit +fi + +args="$@" +DEVICE="" +while [ "$1" != "" ]; do + case "$1" in + /dev/*) + DEVICE=$1 + break;; + esac + shift +done + +if [ "$DEVICE" != "" ] ; then + while true; do + if [ ! -e $DEVICE ] ; then + echo "serdevtry: waiting for $DEVICE to exist..." + while [ ! -e $DEVICE ]; do + sleep 0.1 + done + fi + if [ ! -w $DEVICE ] ; then + # Sometimes (presumably because of a race with udev) we get to + # the device before its permissions have been set up + RETRYNUM=0 + while [ ! -w $DEVICE ]; do + if [ "$RETRYNUM" = "2" ] ; then + echo "Device $DEVICE exists but is not writable!" + exit 1 + fi + RETRYNUM=$((RETRYNUM+1)) + sleep 0.1 + done + fi + $args + if [ -e $DEVICE ] ; then + break + fi + done +else + echo "Unable to determine device node from command: $args" + exit 1 +fi + |