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Message-ID: <47290096.7080207@oracle.com>
Date: Wed, 31 Oct 2007 15:24:22 -0700
From: Randy Dunlap <randy.dunlap@...cle.com>
To: Andreas Mohr <andi@...as.de>
CC: Andrew Morton <akpm@...l.org>,
Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH/RFC] eradicate bashisms in scripts/patch-kernel
Andreas Mohr wrote:
> Hello,
>
> I was non-mildly horrified to find that the rather widely used patch-kernel
> script seems to rely on bash despite specifying the interpreter as #!/bin/sh,
> since my dash-using Debian install choked on it.
>
> Thus I'm delivering a first, preliminary, non-reviewed change to make
> patch-kernel (a little bit more?) POSIX-compatible. It now survives both
> a dash and a bash run.
>
> If this mail goes through relatively unscathed, then it might be a good
> idea to plant it into -mm via a follow-up mail.
>
> Comments?
>
> - replaced "==" by "="
Those are OK.
> - the "source" statement most likely needs the ./ prepended, as can be
> gathered from e.g. http://osdir.com/ml/colinux.devel/2005-12/msg00036.html
That email isn't very convincing to me.
http://www.opengroup.org/onlinepubs/009695399/utilities/dot.html just says that
if <filename> does not contain a slash, the search PATH shall be used (searched).
If you want to prevent that, it's OK to use ./, but at least say that in the
patch description, please.
> - the newly replaced sed expression below: is it ok? correct? strict enough?
>
> Thanks,
>
> Andreas Mohr
>
> (who's strongly hoping that submitting a patch for this thingy doesn't
> automatically equal becoming "maintainer for life" for it ;)
Be careful.
> --- linux-2.6.23/scripts/patch-kernel 2007-10-31 21:55:26.000000000 +0100
> +++ linux-2.6.23/scripts/patch-kernel.dash 2007-10-31 21:58:37.000000000 +0100
> @@ -202,13 +202,7 @@
> EXTRAVER=
> if [ x$EXTRAVERSION != "x" ]
> then
> - if [ ${EXTRAVERSION:0:1} == "." ]; then
> - EXTRAVER=${EXTRAVERSION:1}
> - else
> - EXTRAVER=$EXTRAVERSION
> - fi
> - EXTRAVER=${EXTRAVER%%[[:punct:]]*}
> - #echo "$PNAME: changing EXTRAVERSION from $EXTRAVERSION to $EXTRAVER"
What's the problem above?
> + EXTRAVER=`echo $EXTRAVERSION|sed -s 's/^[\.]\?\([^[:punct:]]*\).*/\1/'`
> fi
>
> #echo "stopvers=$stopvers"
> @@ -251,16 +245,16 @@
> do
> CURRENTFULLVERSION="$VERSION.$PATCHLEVEL.$SUBLEVEL"
> EXTRAVER=
>
> - SUBLEVEL=$((SUBLEVEL + 1))
> + SUBLEVEL=$(( $SUBLEVEL + 1 ))
Why are the added spaces needed?
Did you look at
http://www.opengroup.org/onlinepubs/000095399/utilities/xcu_chap02.html ?
> FULLVERSION="$VERSION.$PATCHLEVEL.$SUBLEVEL"
> #echo "#___ trying $FULLVERSION ___"
>
> - if [ $((SUBLEVEL)) -gt $((STOPSUBLEVEL)) ]; then
> + if [ $SUBLEVEL -gt $STOPSUBLEVEL ]; then
What's the problem here?
> echo "Stopping since sublevel ($SUBLEVEL) is beyond stop-sublevel ($STOPSUBLEVEL)"
> exit 1
> fi
--
~Randy
-
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