Patchwork [6/8] scripts/contrib/serdevtry: add script to handle transient serial terminals

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Submitter Paul Eggleton
Date April 30, 2014, 12:32 p.m.
Message ID <9dbd5d93498c7004a36d34c3ddf5480d7f263610.1398861075.git.paul.eggleton@linux.intel.com>
Download mbox | patch
Permalink /patch/71273/
State Accepted, archived
Commit d20eedb18d62f719feab372d89fad0ca8a695aba
Headers show

Comments

Paul Eggleton - April 30, 2014, 12:32 p.m.
When running automated tests (or just generally interacting with)
boards whose serial console devices are on the board itself and thus
disappear when powered down or practically disconnected, such as the
BeagleBone white, some terminal programs (e.g. picocom) will exit when
the device disappears and need to be restarted after the serial device
returns. This script handles this automatically for such terminal
programs.

Signed-off-by: Paul Eggleton <paul.eggleton@linux.intel.com>
---
 scripts/contrib/serdevtry | 60 +++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 60 insertions(+)
 create mode 100755 scripts/contrib/serdevtry

Patch

diff --git a/scripts/contrib/serdevtry b/scripts/contrib/serdevtry
new file mode 100755
index 0000000..74bd7b7
--- /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
+