linux-kernel - Re: [PATCH v2] scripts/config: allow "O=config-dir" option

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Date:   Thu, 11 Nov 2021 22:04:28 +0100
From:   Nicolas Schier <nicolas@...sle.eu>
To:     Masahiro Yamada <masahiroy@...nel.org>
Cc:     Randy Dunlap <rdunlap@...radead.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Linux Kbuild mailing list <linux-kbuild@...r.kernel.org>,
        Andi Kleen <ak@...ux.intel.com>
Subject: Re: [PATCH v2] scripts/config: allow "O=config-dir" option

Hi Masahiro,

On Fri, Nov 05, 2021 at 12:41:59AM +0900 Masahiro Yamada wrote:
> On Wed, Nov 3, 2021 at 7:40 AM Randy Dunlap <rdunlap@...radead.org> wrote:
> >
> > Support "O=config-dir" as the location of the .config file
> > like (some) other kernel build (make) tools do.
> >
> > Also check for the existence of the config-dir/config-file
> > and report if there is no such file instead of letting grep
> > report that there is no such file.
> >
> > Signed-off-by: Randy Dunlap <rdunlap@...radead.org>
> > Cc: Masahiro Yamada <masahiroy@...nel.org>
> > Cc: Nick Desaulniers <ndesaulniers@...gle.com>
> > Cc: linux-kbuild@...r.kernel.org
> > Cc: Andi Kleen <ak@...ux.intel.com>
> > Reviewed-by: Nicolas Schier <nicolas@...sle.eu>
> > ---
> 
> Why don't you use  --file path/to/output/dir/.config ?

I did not ask for the patch, but it matches some typical situations I
experience at work.  Building kernels out-of-source w/ 'O=' but modifying
.config with the '--file' option does not feel "natural". And 'O=' in
scripts/config allows reusing make arguments (readline/bash's ESC-n ESC-.).

Having the 'O=' argument, it might allow fixing the '--refresh' option to
support out-of-source builds.

Thus, no really great points from me.

Kind regards,
Nicolas


> > v2:
> > - use 'shellcheck' and other recommendations from Nicolas
> > - move one comment from the commit description to under the "---" line
> >
> > Someone asked for this "feature" a few months ago but I don't
> > recall who it was.
> >
> >  scripts/config |   44 +++++++++++++++++++++++++++++++++++++++-----
> >  1 file changed, 39 insertions(+), 5 deletions(-)
> >
> > --- linux-next-20211102.orig/scripts/config
> > +++ linux-next-20211102/scripts/config
> > @@ -37,6 +37,7 @@ commands:
> >
> >  options:
> >         --file config-file   .config file to change (default .config)
> > +       O=config-dir         Specify the directory location of the config-file
> >         --keep-case|-k       Keep next symbols' case (dont' upper-case it)
> >
> >  $myname doesn't check the validity of the .config file. This is done at next
> > @@ -124,15 +125,48 @@ undef_var() {
> >         txt_delete "^# $name is not set" "$FN"
> >  }
> >
> > -if [ "$1" = "--file" ]; then
> > -       FN="$2"
> > -       if [ "$FN" = "" ] ; then
> > +DIR=
> > +FN=
> > +
> > +while [ "$DIR" = "" ] || [ "$FN" = "" ]; do
> > +
> > +       if [ "$1" = "" ] ; then
> >                 usage
> >         fi
> > -       shift 2
> > -else
> > +       if [ "$1" = "--file" ]; then
> > +               FN="$2"
> > +               if [ "$FN" = "" ] ; then
> > +                       usage
> > +               fi
> > +               shift 2
> > +               continue
> > +       fi
> > +
> > +       optn=$1
> > +       optnlen=${#optn}
> > +       if [ "$optnlen" -gt 1 ] && [ "${optn:0:2}" = "O=" ]; then
> > +               DIR=${optn:2}
> > +               shift
> > +               if [ "$DIR" = "" ]; then
> > +                       usage
> > +               fi
> > +               continue
> > +       fi
> > +       break   # something other than --file or O=dir
> > +done
> > +
> > +if [ "$FN" = "" ]; then
> >         FN=.config
> >  fi
> > +if [ "$DIR" != "" ]; then
> > +       DIR=$DIR"/"
> > +fi
> > +FN="${DIR}${FN}"
> > +
> > +if [ ! -r "$FN" ]; then
> > +       echo "No such config file: $FN"
> > +       exit
> > +fi
> >
> >  if [ "$1" = "" ] ; then
> >         usage
> 
> 
> 
> -- 
> Best Regards
> Masahiro Yamada

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