Hello,
As part of the effort of creating vm-images for the Hurd using Guix, it
would be nice to use extended file attributes to set passive
translators.
In particular, it would be helpful if we could use
setfattr --name=gnu.translator --value=/hurd/pfinet 1
That would allow us to boot right into Guile and skip a Bash script to
only to run
settrans -c /servers/socket/1 /hurd/pflocal
Whether on GNU/Linux or on the Hurd (booted with
--x-xattr-translator-records and x-xattr-translator-records option in
fstab); almost nothing works.
The Hurd
root@debian:~# cat /etc/fstab
# /etc/fstab: static file system information.
#
# <file system> <mount point> <type> <options> <dump> <pass>
/dev/hd0s2 / ext2 defaults,x-xattr-translator-records
0 1
/dev/hd0s1 none swap sw 0 0
/dev/hd2 /media/cdrom0 iso9660 noauto 0 0
root@debian:~# fsysopts /
ext2fs --writable --no-inherit-dir-group --x-xattr-translator-records
--store-type=typed device:hd0s2
root@debian:~# ps -ef --width=1000 | grep ext2
- 5 2 - 0:02.98 ext2fs --readonly
--multiboot-command-line=root=device:hd0s2 --host-priv-port=1
--device-master-port=2 --exec-server-task=3 -T typed device:hd0s2
--x-xattr-translator-records
so that seems OK? Still, nothing seems to work
root@debian:~# touch 1
root@debian:~# mknod 2 c 0 0
root@debian:~# setfattr --name=gnu.translator --value=/hurd/pfinet 1
setfattr: 1: Invalid argument
root@debian:~# setfattr --name=gnu.translator --value=/hurd/pfinet 2
setfattr: 2: Invalid argument
root@debian:~# setfattr --name=gnu.author --value=/hurd/pfinet 1
setfattr: 1: Invalid argument
root@debian:~# setfattr --name=gnu.author --value=/hurd/pfinet 2
setfattr: 2: Invalid argument
root@debian:~# setfattr --name=user.translator --value=/hurd/pfinet 1
setfattr: 1: Operation not supported
root@debian:~# setfattr --name=user.translator --value=/hurd/pfinet 2
setfattr: 2: Operation not supported
On GNU/Linux, I only managed to set user.X, not gnu.translator
root@dundal ~# touch 1
root@dundal ~# mknod 2 c 0 0
root@dundal ~# setfattr --name=gnu.translator --value=/hurd/pfinet 1
setfattr: 1: Operation not supported
root@dundal ~# setfattr --name=gnu.translator --value=/hurd/pfinet 2
setfattr: 2: Operation not supported
root@dundal ~# setfattr --name=gnu.author --value=/hurd/pfinet 1
setfattr: 1: Operation not supported
root@dundal ~# setfattr --name=gnu.author --value=/hurd/pfinet 2
setfattr: 2: Operation not supported
root@dundal ~# setfattr --name=user.translator --value=/hurd/pfinet 1
root@dundal ~# setfattr --name=user.translator --value=/hurd/pfinet 2
setfattr: 2: Operation not permitted
only one command succeeds, but that's next to useless (well, it suggests touch
could work and we don't need mknod).
This
https://lists.gnu.org/archive/html/bug-hurd/2004-02/msg00108.html
is the only interesting piece of information I found; down the thread
there is a suggestion to try upstreaming. I looked at the Linux sources
They seem to suggest that only a couple of namespaces are allowed (and
"gnu" is not one of them) but find them hard to read.
Greetings,
janneke
--
Jan Nieuwenhuizen <jann...@gnu.org> | GNU LilyPond http://lilypond.org
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