openat, chownat, ... in Guile?

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  • Maxime Devos
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Maxime Devos
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Maxime Devos wrote on 2 Feb 2021 15:45
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(address . bug-guile@gnu.org)
6c9d1a78a198d4b5111fe42af67eaeb241e507ae.camel@telenet.be
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Hi guilers,

I would like to see fchownat, openat, fchmodat
and any *at variants I forgot to appear in future versions
of Guile in some form. I have two proposals, which I will
illustrate with the procedure 'chmod':

* chmod can currently modify permissions of a file.
This OBJECT argument identifying the file can currently
be a filename or a port. Allow a ‘file in a directory’
object as well. This could be created with a procedure

(make-path-at DIRECTORY-PORT FILENAME)

This procedure does not perform any I/O, but rather
constructs what is effectively is a pair (DIRECTORY-PORT
. FILENAME) but with its own type.

* Follow the C API, but with Scheme types.

(chmodat DIRECTORY-PORT FILENAME MODE FLAGS)

where FLAGS can include AT_SYMLINK_NOFOLLOW (from chmod(2)
Linux man page)

Any thoughts?

Greetings,
Maxime

P.S. I'm not subscribed to bug-guile@gnu.org, please CC me.
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M
M
Maxime Devos wrote on 5 Feb 2021 15:16
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Re: Potential security weakness in Guix services
(name . Ludovic Courtès)(address . ludo@gnu.org)(address . guix-devel@gnu.org)
c6164b827beb62aa8f8f276473081eb7cf557110.camel@telenet.be
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On Fri, 2021-02-05 at 13:20 +0100, Maxime Devos wrote:
Toggle quote (9 lines)
> On Fri, 2021-02-05 at 10:57 +0100, Ludovic Courtès wrote:
> > [...]
> [...]
>
> I'll try to implement this API in Scheme (using the FFI), and post
> it at https://notabug.org/mdevos/things. I'll post a follow-up
> messsage once I've implemented the basics (openat, chmodat,
> chownat).

Ping!
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M
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Maxime Devos wrote on 24 Mar 2022 12:55
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Re: bug#54485: [PATCH] gnu: Add guile-with-openat.
(name . Ludovic Courtès)(address . ludo@gnu.org)
c1bc08a29b8c836ce6098e28fb0c01c2587bc013.camel@telenet.be
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Ludovic Courtès schreef op do 24-03-2022 om 12:37 [+0100]:
Toggle quote (4 lines)
> Instead, I would prefer to actually review and apply the patches
> upstream.  I’ve been meaning to do that, really, but it requires a chunk
> of time and focus, which keeps leading me to postpone.

OK. I can relate, w.r.t. the IPFS substitution patches.

Toggle quote (3 lines)
> Is the latest patch set on guile-devel?  It’s not mentioned at
> <https://issues.guix.gnu.org/46258>.


Greetings,
Maxime.
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