linux-kernel - Re: [PATCH] eradicate bashisms in scripts/patch-kernel

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Date:	Wed, 2 Jan 2008 15:00:34 -0800
From:	Randy Dunlap <rdunlap@...otime.net>
To:	Andreas Mohr <andi@...as.de>
Cc:	Sam Ravnborg <sam@...nborg.org>,
	Randy Dunlap <rdunlap@...otime.net>,
	Herbert Xu <herbert@...dor.apana.org.au>,
	Andrew Morton <akpm@...l.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] eradicate bashisms in scripts/patch-kernel

On Sat, 17 Nov 2007 21:51:25 +0100 Andreas Mohr wrote:

> Make the patch-kernel shell script sufficiently compatible with POSIX
> shells,
> i.e., remove bashisms from scripts/patch-kernel.
> This means that it now also works on dash 0.5.3-5
> and still works on bash 3.1dfsg-8.
> 
> Full changelog:
> - replaced non-standard "==" by standard "="
> - replaced non-standard "source" statement by POSIX "dot" command
> - use leading ./ on mktemp filename to force the tempfile to a local
>   directory, so that the search path is not used
> - replace bash syntax to remove leading dot by similar POSIX syntax
> - added missing (optional/not required) $ signs to shell variable names

The use of $(($x)) should not be needed with latest dash....
anyway, Acked-by: Randy Dunlap <randy.dunlap@...cle.com>


> Signed-off-by: Andreas Mohr <andi@...as.de>
> ---
> Thanks for all comments! I might want to make sure to read more specs
> next time...
> Cowardly didn't dare to pre-add Randy's line, feel free to ack ;)
> 
> --- linux-2.6.23/scripts/patch-kernel.orig	2007-11-17 21:26:47.000000000 +0100
> +++ linux-2.6.23/scripts/patch-kernel	2007-11-17 21:27:59.000000000 +0100
> @@ -65,7 +65,7 @@
>  patchdir=${2-.}
>  stopvers=${3-default}
>  
> -if [ "$1" == -h -o "$1" == --help -o ! -r "$sourcedir/Makefile" ]; then
> +if [ "$1" = -h -o "$1" = --help -o ! -r "$sourcedir/Makefile" ]; then
>  cat << USAGE
>  usage: $PNAME [-h] [ sourcedir [ patchdir [ stopversion ] [ -acxx ] ] ]
>    source directory defaults to /usr/src/linux,
> @@ -182,10 +182,12 @@
>  }
>  
>  # set current VERSION, PATCHLEVEL, SUBLEVEL, EXTRAVERSION
> -TMPFILE=`mktemp .tmpver.XXXXXX` || { echo "cannot make temp file" ; exit 1; }
> +# force $TMPFILEs below to be in local directory: a slash character prevents
> +# the dot command from using the search path.
> +TMPFILE=`mktemp ./.tmpver.XXXXXX` || { echo "cannot make temp file" ; exit 1; }
>  grep -E "^(VERSION|PATCHLEVEL|SUBLEVEL|EXTRAVERSION)" $sourcedir/Makefile > $TMPFILE
>  tr -d [:blank:] < $TMPFILE > $TMPFILE.1
> -source $TMPFILE.1
> +. $TMPFILE.1
>  rm -f $TMPFILE*
>  if [ -z "$VERSION" -o -z "$PATCHLEVEL" -o -z "$SUBLEVEL" ]
>  then
> @@ -202,11 +204,7 @@
>  EXTRAVER=
>  if [ x$EXTRAVERSION != "x" ]
>  then
> -	if [ ${EXTRAVERSION:0:1} == "." ]; then
> -		EXTRAVER=${EXTRAVERSION:1}
> -	else
> -		EXTRAVER=$EXTRAVERSION
> -	fi
> +	EXTRAVER=${EXTRAVERSION#.}
>  	EXTRAVER=${EXTRAVER%%[[:punct:]]*}
>  	#echo "$PNAME: changing EXTRAVERSION from $EXTRAVERSION to $EXTRAVER"
>  fi
> @@ -251,16 +249,16 @@
>  do
>      CURRENTFULLVERSION="$VERSION.$PATCHLEVEL.$SUBLEVEL"
>      EXTRAVER=
> -    if [ $stopvers == $CURRENTFULLVERSION ]; then
> +    if [ $stopvers = $CURRENTFULLVERSION ]; then
>          echo "Stopping at $CURRENTFULLVERSION base as requested."
>          break
>      fi
>  
> -    SUBLEVEL=$((SUBLEVEL + 1))
> +    SUBLEVEL=$(($SUBLEVEL + 1))
>      FULLVERSION="$VERSION.$PATCHLEVEL.$SUBLEVEL"
>      #echo "#___ trying $FULLVERSION ___"
>  
> -    if [ $((SUBLEVEL)) -gt $((STOPSUBLEVEL)) ]; then
> +    if [ $(($SUBLEVEL)) -gt $(($STOPSUBLEVEL)) ]; then
>  	echo "Stopping since sublevel ($SUBLEVEL) is beyond stop-sublevel ($STOPSUBLEVEL)"
>  	exit 1
>      fi
> @@ -297,7 +295,7 @@
>  if [ x$gotac != x ]; then
>    # Out great user wants the -ac patches
>  	# They could have done -ac (get latest) or -acxx where xx=version they want
> -	if [ $gotac == "-ac" ]; then
> +	if [ $gotac = "-ac" ]; then
>  	  # They want the latest version
>  		HIGHESTPATCH=0
>  		for PATCHNAMES in $patchdir/patch-${CURRENTFULLVERSION}-ac*\.*
> -

---
~Randy
desserts:  http://www.xenotime.net/linux/recipes/
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