linux-kernel - Re: [PATCH] kbuild: fix package build error due to broken symlinks

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Message-ID: <CAK7LNAQkKE8X3n6Tyw1oX2g-TsLqpY54yi=ObCHfARdm02Gvyw@mail.gmail.com>
Date:   Sat, 1 Apr 2023 23:55:44 +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>,
        Nick Desaulniers <ndesaulniers@...gle.com>
Subject: Re: [PATCH] kbuild: fix package build error due to broken symlinks

On Thu, Mar 30, 2023 at 5:02 AM Nicolas Schier <nicolas@...sle.eu> wrote:
>
> On Sat 25 Mar 2023 23:19:09 GMT, Masahiro Yamada wrote:
> > 'make deb-pkg' and 'make rpm-pkg' fail if a broken symlink exists in
> > a dirty source tree. Handle symlinks properly, and also, keep the
> > executable permission.
> >
> > Fixes: 05e96e96a315 ("kbuild: use git-archive for source package creation")
> > Signed-off-by: Masahiro Yamada <masahiroy@...nel.org>
> > ---
> >
> >  scripts/package/gen-diff-patch | 36 +++++++++++++++++++++++++---------
> >  1 file changed, 27 insertions(+), 9 deletions(-)
> >
> > diff --git a/scripts/package/gen-diff-patch b/scripts/package/gen-diff-patch
> > index f842ab50a780..23551de92e1b 100755
> > --- a/scripts/package/gen-diff-patch
> > +++ b/scripts/package/gen-diff-patch
> > @@ -23,16 +23,34 @@ fi
> >  git -C ${srctree} status --porcelain --untracked-files=all |
> >  while read stat path
> >  do
> > -     if [ "${stat}" = '??' ]; then
> > -
> > -             if ! diff -u /dev/null "${srctree}/${path}" > .tmp_diff &&
> > -                     ! head -n1 .tmp_diff | grep -q "Binary files"; then
> > -                     {
> > -                             echo "--- /dev/null"
> > -                             echo "+++ linux/$path"
> > -                             cat .tmp_diff | tail -n +3
> > -                     } >> ${untracked_patch}
> > +     if [ "${stat}" != '??' ]; then
> > +             continue
> > +     fi
> > +
> > +     if [ -L "${path}" ]; then
> > +             {
> > +                     echo "diff --git a/${path} b/${path}"
> > +                     echo "new file mode 120000"
> > +                     echo "--- /dev/null"
> > +                     echo "+++ b/$path"
> > +                     echo "@@ -0,0 +1 @@"
> > +                     printf "+"; readlink ${path}
>
> Better quote "${path}"?


Thanks for the suggestion.

Quoting variables are correct in most cases.
But, that is not enough to generate a valid
patch when a file path contains spaces.



'git format-patch' produces a patch that
is accepted by GNU patch and also by dpkg-source.

I learned a trick from GIT source code.


If you are interested, what GIT does [1].


[1] https://github.com/git/git/commit/1a9eb3b9d50367bee8fe85022684d812816fe531


I will send v2 later, where I made some more efforts
to fix several corner cases even if that is not perfect.








-- 
Best Regards
Masahiro Yamada