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From:   Masahiro Yamada <yamada.masahiro@socionext.com>
Date:   Sat, 5 Oct 2019 22:17:39 +0900
Message-ID: <CAK7LNATF=50am-TBOAvr8-O+usgyczyfbDYbMp3MAmAKu46-1A@mail.gmail.com>
Subject: Re: BISECTED: Compile error on 5.4-rc1
To:     Harald Arnesen <harald@skogtun.org>
Cc:     Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
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On Sat, Oct 5, 2019 at 7:50 PM Harald Arnesen <harald@skogtun.org> wrote:
>
> Masahiro Yamada [05.10.2019 12:19]:
>
> > CONFIG_SHELL previously fell back to 'sh' when bash is not installed,
> > so I just kept it as it was.
> >
> > If we had used the exact absolute path /bin/sh,
> > it would have worked irrespective of the PATH environment.
> >
> > But, there is a counter option like this:
> >
> >
> > commit 16f8259ca77d04f95e5ca90be1b1894ed45816c0
> > Author: Bj=C3=B8rn Forsman <bjorn.forsman@gmail.com>
> > Date:   Sun Nov 5 10:44:16 2017 +0100
> >
> >     kbuild: /bin/pwd -> pwd
> >
> >     Most places use pwd and rely on $PATH lookup. Moving the remaining
> >     absolute path /bin/pwd users over for consistency.
> >
> >     Also, a reason for doing /bin/pwd -> pwd instead of the other way a=
round
> >     is because I believe build systems should make little assumptions o=
n
> >     host filesystem layout. Case in point, we do this kind of patching
> >     already in NixOS.
> >
> >     Ref. commit 028568d84da3cfca49f5f846eeeef01441d70451
> >     ("kbuild: revert $(realpath ...) to $(shell cd ... && /bin/pwd)").
> >
> >     Signed-off-by: Bj=C3=B8rn Forsman <bjorn.forsman@gmail.com>
> >     Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
> >
> >
> >
> > I cannot find a way to satisfy everybody.
> >
>
> I'm totally fine with the way it is now, now that I know how it works.
> However, doesn't Posix dictate that there is a /bin/sh?


As for POSIX, I found this:

---------------------->8----------------------------
Applications should note that the standard PATH to the shell cannot
be assumed to be either /bin/sh or /usr/bin/sh, and should be determined
by interrogation of the PATH returned by getconf PATH , ensuring that
the returned pathname is an absolute pathname and not a shell built-in.
---------------------->8----------------------------

https://pubs.opengroup.org/onlinepubs/009695399/utilities/sh.html


--=20
Best Regards
Masahiro Yamada