linux-kernel - Re: [PATCH 2/2] kbuild: package: add -e and -u options to shell scripts

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Date: Mon, 17 Jun 2024 01:52:23 +0900
From: Masahiro Yamada <masahiroy@...nel.org>
To: Nicolas Schier <nicolas@...sle.eu>
Cc: linux-kbuild@...r.kernel.org, linux-kernel@...r.kernel.org, 
	Nathan Chancellor <nathan@...nel.org>
Subject: Re: [PATCH 2/2] kbuild: package: add -e and -u options to shell scripts

On Mon, Jun 17, 2024 at 12:56 AM Nicolas Schier <nicolas@...sle.eu> wrote:
>
> On Mon, Jun 17, 2024 at 12:21:15AM +0900, Masahiro Yamada wrote:
> > On Wed, Jun 12, 2024 at 1:09 AM Masahiro Yamada <masahiroy@...nel.org> wrote:
> > >
> > > Set -e to make these scripts fail on the first error.
> > >
> > > Set -u because these scripts are invoked by Makefile, and do not work
> > > properly without necessary variables defined.
> > >
> > > Remove the explicit "test -n ..." from scripts/package/install-extmod-build.
> > >
> > > Both options are described in POSIX. [1]
> > >
> > > [1]: https://pubs.opengroup.org/onlinepubs/009604499/utilities/set.html
> > >
> > > Signed-off-by: Masahiro Yamada <masahiroy@...nel.org>
> > > ---
> >
> >
> >
> > Setting -u needs more careful review and test.
> >
> >
> > This patch will break 'make deb-pkg'.
> >
> >
> > ./scripts/package/mkdebian: 150: KDEB_PKGVERSION: parameter not set
> >
> >
> >
> >
> > To set -u, scripts/package/mkdebian needs code refactoring.
> >
> >
> >
> > I will keep scripts/package/mkdebian untouched.
>
> uh, I missed that during the review.  Do you want to refactor mkdebian
> in large scale, or is an explicit fallback definition possibly
> acceptable for you?
>
> diff --git a/scripts/package/mkdebian b/scripts/package/mkdebian
> index ecfeb34b99aa..7e3878197041 100755
> --- a/scripts/package/mkdebian
> +++ b/scripts/package/mkdebian
> @@ -7,5 +7,17 @@
>  set -eu
>
> +# Optional user-specified environment variables
> +
> +# Set target Debian architecture (skip auto-detection)
> +: "${KBUILD_DEBARCH:=}"
> +
> +# Set target Debian distribution (skipping auto-detection)
> +: "${KDEB_CHANGELOG_DIST:=}"
> +
> +# Overwrite the automatically determined package version.
> +: ${KDEB_PKGVERSION:=}
> +
> +
>  is_enabled() {
>         grep -q "^$1=y" include/config/auto.conf
>  }
>




It depends on the code.




I would fix


   if [ -n "$KDEB_PKGVERSION" ]; then


to

   if [ "${KDEB_PKGVERSION:+set}" = set ]; then

or
   if [ "${KDEB_PKGVERSION:+set}" ]; then





--
Best Regards
Masahiro Yamada