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Re: Feeble attempt at using xattr gnu.translator

From: Samuel Thibault
Subject: Re: Feeble attempt at using xattr gnu.translator
Date: Mon, 11 May 2020 10:42:08 +0200
User-agent: NeoMutt/20170609 (1.8.3)

Jan Nieuwenhuizen, le lun. 11 mai 2020 10:33:53 +0200, a ecrit:
>    gnu.translator     empty if no passive translator
>                       translator and arguments: "/hurd/foo\0arg1\0arg2\0"
> ah...so there's a nice hack (way??) to also pass arguments...

? It's not hack, it's how it's passed on the process main() stack anyway.

> diskfs_S_file_set_translator (struct protid *cred,
> [...]
>   if (passivelen && passive[passivelen - 1])
>     return EINVAL;
> hmm; so even when there are no arguments, VALUE must end with 0?!


> root@debian:~# setfattr --name=gnu.translator --value='/hurd/pflocal\0' 1
> root@debian:~# showtrans 1
> /hurd/pflocal
> --8<---------------cut here---------------end--------------->8---
> ...so "something" works.

Good :)

> Sadly, this trick does not work on GNU/Linux.  I'm afraid this hasn't
> been upstreamed and we would have to debug linux and/or create a patch
> for setxattr to accept "gnu." on "Hurd" type file systems.  Thoughts?

Well, this has to be done, yes, I don't know what else to add :)


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