Re: [PATCH] systemd: Fix build on musl

["Khem Raj" <raj.khem@gmail.com>]

On Thu, Jul 29, 2021 at 6:54 AM Luca Boccassi <luca.boccassi@gmail.com> wrote:
>
> On Thu, 2021-07-29 at 14:49 +0100, Luca Boccassi wrote:
> > On Thu, 2021-07-29 at 12:59 +0000, Khem Raj wrote:
> > > Latest upgrade to 249 broke a working build on musl, this is incremental
> > > fix to exisiting patches adapted to 249 release
> > >
> > > Signed-off-by: Khem Raj <raj.khem@gmail.com>
> > > Cc: Luca Boccassi <luca.boccassi@microsoft.com>
> > > ---
> > >  ...002-don-t-use-glibc-specific-qsort_r.patch |  24 +--
> > >  ...missing.h-check-for-missing-strndupa.patch | 173 +++++++++---------
> > >  .../0006-Include-netinet-if_ether.h.patch     | 147 ++++++++-------
> > >  ...OB_BRACE-and-GLOB_ALTDIRFUNC-is-not-.patch |  20 +-
> > >  ...T_SYMLINK_NOFOLLOW-flag-to-faccessat.patch |  14 +-
> > >  ...-not-disable-buffer-in-writing-files.patch | 143 ++++++---------
> > >  .../systemd/0026-Handle-missing-gshadow.patch |  18 +-
> > >  7 files changed, 247 insertions(+), 292 deletions(-)
> > >
> >
> > Having a look at the patches, a few comments:
> >
> > - 0001-test-parse-argument-Include-signal.h.patch was merged upstream,
> > but never removed, I think because it was refactored so it applies
> > cleanly and doesn't raise errors?

seems so.


> >
> > - 0005-src-basic-missing.h-check-for-missing-strndupa.patch this is
> > massive and will keep growing and breaking the build, wouldn't it be
> > better to just implement strndupa in musl? Even out-of-tree it sounds
> > like it would be easier to maintain than this



> >
> > - 0006-Include-netinet-if_ether.h.patch sounds like it should be doable
> > in a way that is compatible with both glibc and musl, and thus could be
> > upstreamed?

I think it could be, although systemd has started caching some of
these system headers in its own sources
which is also troublesome. So overall it has to be addressed with a
bit wider scope.

> >
> > - 0010-Use-uintmax_t-for-handling-rlim_t.patch can be upstreamed but
> > needs to be reworked slightly as explained in
> > https://github.com/systemd/systemd/pull/7199#issuecomment-358268647
> > which seems worth doing to me
> >

perhaps yes, although I was not sure what it would be for a patch.

> > - 0012-don-t-pass-AT_SYMLINK_NOFOLLOW-flag-to-faccessat.patch I find
> > quite worrying, as it fundamentally changes access patterns, some of
> > which are done for security reasons. At best, this will cause
> > completely different runtime behaviours for the same filesystem
> > depending on the libc implementation, which doesn't sound great?
> >
> > - 0016-Hide-__start_BUS_ERROR_MAP-and-__stop_BUS_ERROR_MAP.patch sounds
> > like a genuine bug, have you tried upstreaming it?
> >

It was part of a cumulative patchset to support musl which was not
accepted but I can try this patch alone.

> > - 0019-Handle-missing-LOCK_EX.patch I see no problem upstreaming this

OK

> >
> > - 0028-missing_syscall.h-Define-MIPS-ABI-defines-for-musl.patch should
> > also be fine to upstream I think, in src/basic/missing_syscall_def.h

OK

>
> Also isn't 0001-binfmt-Don-t-install-dependency-links-at-install-
> tim.patch doable with two drop-ins and a post-install adjustment in the
> recipe, rather than with a patch?
>
> This also sounds like a good candidate for a drop-in, doesn't seem
> generally applicable to me:
>
> https://git.yoctoproject.org/cgit/cgit.cgi/poky/commit/?id=f65757ad1791a46cc210141c84ccc51552171e98
>

surely although its generic and not musl specific perhaps deal with it
separately.

> --
> Kind regards,
> Luca Boccassi