[Bug debugedit/31504] debugedit writes out ELF file even when nothing has been updated

["mark at klomp dot org" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=31504

Mark Wielaard <mark at klomp dot org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Resolution|---                         |FIXED
             Status|ASSIGNED                    |RESOLVED

--- Comment #6 from Mark Wielaard <mark at klomp dot org> ---
(In reply to Allan McRae from comment #5)
> > I can add a check to see if there actually were any changes and if there aren't simply not call elf_update at all. But I suspect that is really a corner case that doesn't occur that often. At least why would you call debugedit explicitly asking to rewrite things and then expect it to not actually do that?
> 
> Our packaging system checks for ELF files and tries generating associated
> debug packages with source files and debug symbols.  It turns out there are
> a lot of packages that provide a .NET 8.0 self-contained/ single-file
> application, which is and ELF file and did not enjoy being processed by
> debugedit.

I understand that. And I think these aren't really "ELF" files because they add
something to the file that isn't described by the ELF structures. What I don't
fully understand is why you are expecting debugedit to NOT change the debug
path strings when you are asking it to. Is this because there file don't
actually contain any .debug sections?

> The v2 patch fixes the issue we observed.

Thanks for double checking. Pushed:

commit 6dd28bb30320e5236b3b5f79b6b2b41d2b2317bd
Author: Mark Wielaard <mark@klomp.org>
Date:   Mon Mar 18 23:37:47 2024 +0100

    debugedit: Only write the ELF file when updating strings or build-id

    Only open the ELF file read/write and write out the data if we
    actually did any elf structure update or updating the build-id.

            * tools/debugedit.c (fdopen_dso): Call elf_begin with
            ELF_C_READ when not changing dest_dir or build_id,
            otherwise use ELF_C_RDWR.
            (main): Call open with O_RDONLY when not changing dest_dir
            or build_id, otherwise use O_RDWR. Call elf_update with
            ELF_C_WRITE when rewriting any string, updating any ELF
            structure or build_id.

    https://sourceware.org/bugzilla/show_bug.cgi?id=31504

    Signed-off-by: Mark Wielaard <mark@klomp.org>

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