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

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Date:   Sat, 1 Apr 2023 19:53:21 +0200
From:   Nicolas Schier <nicolas@...sle.eu>
To:     Masahiro Yamada <masahiroy@...nel.org>
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 Sat, Apr 01, 2023 at 11:55:44PM +0900 Masahiro Yamada wrote:
> 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

thanks for the pointer, that is really interesting!

Kind regards,
Nicolas


> 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

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