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Re: Package for development of out-of-tree kernel modules written in Rust

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On 26/02/25 19:10, Miguel Ojeda wrote:
> On Wed, Feb 26, 2025 at 3:15 PM NoisyCoil<noisycoil@disroot.org> wrote:
>> Yeah I'd imagined this could happen. Currently d/rules just copies
>> rust/{*.rmeta,*.so} into the destination directory. My guess was that in
>> the future they could be placed in subdirectories of rust/, but on a
>> second thought I think as subsystems accept Rust they could be located
>> kind of anywhere in the build directory? If this is the case, then I
> Unknown yet -- my current plan is to propose to generate them all in a
> single place (which may be different than their current place) for
> simplicity. But if people disagree, I may have to place them all over
> the tree.
> 
>> think hardcoding can hardly be avoided. One will just have to change the
>> hardcoded paths as needed (not ideal, but oh, well; also, absolutely not
>> unheard of :-)). I say this mostly because of the *.so files: assuming
>> that all *.rmeta files must be installed probably is a good enough
>> assumption, but the same is not true for *.so files.
> If a single place is better for you, that is another argument that I
> can use to push for the thing I mentioned above, so I wouldn't mind to
> hear that! 🙂

My personal opinion (which tbf doesn't matter a lot since I won't be the 
one dealing with this in the long run) is if there is no strong reason 
for placing them at specific but seemingly random places, picking a 
single place would be best. A few reasons I can think of:

1. it makes them more discoverable

2. it relieves packagers from having to manually keep track of what must 
be installed, especially if whether they are generated or not depends on 
the config (I think this is not the case right now, but I don't see why 
it couldn't be in the future)

3. if they are scattered all over the tree the package that ships them 
will be a large tree of directories each mostly containing a single rust 
artifact, which is quite ugly imo.

>> On the other hand, one could maybe use something like `objdump -T
>> whatever.so | grep rustc_proc_macro_decls` to discover if a .so file is
>> a rust proc macro?
> In the case where we are everywhere, I guess I could output a file
> easily with the paths of all the needed dependencies, if that would
> help.

If they cannot be put in a single place then, yeah, properly documenting 
their existence will make life easier for packagers. A config-dependent 
file $file generated at build time that one can just `cat $file | cpio 
-pd $DIR` would be enough. Again, this is not so much for .rmeta files, 
those are specific enough to Rust that one can just pull them all in 
(without solving issue 3. above though), but for other stuff like proc 
macro shared libraries which require deeper inspection than looking at 
file names.

> Thanks for the feedback!

Thank you for taking the time to answer!

> Cheers,
> Miguel
> 

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Package for development of out-of-tree kernel modules written in Rust NoisyCoil <noisycoil@disroot.org> - 2025-02-26 01:30 +0100
  Re: Package for development of out-of-tree kernel modules written in  Rust Bastian Blank <waldi@debian.org> - 2025-02-26 12:50 +0100
    Re: Package for development of out-of-tree kernel modules written in  Rust NoisyCoil <noisycoil@disroot.org> - 2025-02-26 13:20 +0100
      Re: Package for development of out-of-tree kernel modules written in Rust Miguel Ojeda <miguel.ojeda.sandonis@gmail.com> - 2025-02-26 14:00 +0100
        Re: Package for development of out-of-tree kernel modules written in  Rust NoisyCoil <noisycoil@disroot.org> - 2025-02-26 15:20 +0100
          Re: Package for development of out-of-tree kernel modules written in Rust Miguel Ojeda <miguel.ojeda.sandonis@gmail.com> - 2025-02-26 19:30 +0100
            Re: Package for development of out-of-tree kernel modules written in  Rust NoisyCoil <noisycoil@disroot.org> - 2025-02-26 22:00 +0100
              Re: Package for development of out-of-tree kernel modules written in Rust Miguel Ojeda <miguel.ojeda.sandonis@gmail.com> - 2025-02-27 18:40 +0100
        Re: Package for development of out-of-tree kernel modules written  in Rust Ben Hutchings <ben@decadent.org.uk> - 2025-02-26 19:20 +0100
          Re: Package for development of out-of-tree kernel modules written in  Rust NoisyCoil <noisycoil@disroot.org> - 2025-02-26 19:30 +0100
            Re: Package for development of out-of-tree kernel modules written in Rust Miguel Ojeda <miguel.ojeda.sandonis@gmail.com> - 2025-02-26 20:10 +0100
              Re: Package for development of out-of-tree kernel modules written in  Rust NoisyCoil <noisycoil@disroot.org> - 2025-02-26 20:20 +0100
                Re: Package for development of out-of-tree kernel modules written in Rust Miguel Ojeda <miguel.ojeda.sandonis@gmail.com> - 2025-02-27 18:40 +0100
              Re: Package for development of out-of-tree kernel modules written in  Rust Bastian Blank <waldi@debian.org> - 2025-04-02 23:00 +0200
                Re: Package for development of out-of-tree kernel modules written in  Rust Bastian Blank <waldi@debian.org> - 2025-04-02 23:30 +0200
                Re: Package for development of out-of-tree kernel modules written in  Rust NoisyCoil <noisycoil@disroot.org> - 2025-04-02 23:40 +0200
                Re: Package for development of out-of-tree kernel modules written in  Rust NoisyCoil <noisycoil@disroot.org> - 2025-04-03 00:50 +0200
                Re: Package for development of out-of-tree kernel modules written in  Rust Bastian Blank <waldi@debian.org> - 2025-04-03 16:50 +0200
                Re: Package for development of out-of-tree kernel modules written in  Rust NoisyCoil <noisycoil@disroot.org> - 2025-04-03 19:30 +0200
                Re: Package for development of out-of-tree kernel modules written in  Rust Bastian Blank <waldi@debian.org> - 2025-04-03 21:00 +0200
                Re: Package for development of out-of-tree kernel modules written in Rust Miguel Ojeda <miguel.ojeda.sandonis@gmail.com> - 2025-04-03 23:30 +0200
                Re: Package for development of out-of-tree kernel modules written in  Rust NoisyCoil <noisycoil@disroot.org> - 2025-04-03 23:40 +0200
                Re: Package for development of out-of-tree kernel modules written in Rust Miguel Ojeda <miguel.ojeda.sandonis@gmail.com> - 2025-04-06 23:40 +0200
                Re: Package for development of out-of-tree kernel modules written in  Rust NoisyCoil <noisycoil@disroot.org> - 2025-04-12 18:50 +0200
                Re: Package for development of out-of-tree kernel modules written in  Rust Bastian Blank <waldi@debian.org> - 2025-04-13 13:40 +0200
                Re: Package for development of out-of-tree kernel modules written in  Rust NoisyCoil <noisycoil@disroot.org> - 2025-04-13 17:40 +0200
                Re: Package for development of out-of-tree kernel modules written in Rust Miguel Ojeda <miguel.ojeda.sandonis@gmail.com> - 2025-04-13 18:40 +0200
                Re: Package for development of out-of-tree kernel modules written in  Rust NoisyCoil <noisycoil@disroot.org> - 2025-04-13 20:30 +0200
                Re: Package for development of out-of-tree kernel modules written  in Rust Ben Hutchings <ben@decadent.org.uk> - 2025-04-16 17:40 +0200
                Re: Package for development of out-of-tree kernel modules written in Rust Miguel Ojeda <miguel.ojeda.sandonis@gmail.com> - 2025-05-03 17:10 +0200
                Re: Package for development of out-of-tree kernel modules written in  Rust Bastian Blank <waldi@debian.org> - 2025-04-04 11:20 +0200
                Re: Package for development of out-of-tree kernel modules written in Rust Miguel Ojeda <miguel.ojeda.sandonis@gmail.com> - 2025-04-06 23:40 +0200
          Re: Package for development of out-of-tree kernel modules written in Rust Miguel Ojeda <miguel.ojeda.sandonis@gmail.com> - 2025-02-26 19:40 +0100
      Re: Package for development of out-of-tree kernel modules written in  Rust NoisyCoil <noisycoil@disroot.org> - 2025-02-26 14:40 +0100
      Re: Package for development of out-of-tree kernel modules written in  Rust Bastian Blank <waldi@debian.org> - 2025-02-26 14:40 +0100

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