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Re: exec server and /dev/fd/N

From: Emilio Pozuelo Monfort
Subject: Re: exec server and /dev/fd/N
Date: Thu, 27 May 2010 18:22:26 +0200


On 25/05/10 21:10, Carl Fredrik Hammar wrote:
> Some of the changes that need to be made have already been discussed on
> IRC: you should use string_t instead of data_t, empty string instead of
> NULL for RPCs, and update copyright years,

All fixed.

> The first three patches are pretty useless on their own, they all affect
> the same program, and most changes are pretty mechanical, so I think
> you might as well merge them.

I've merged them in 0001.

> You also haven't changed some calls to exec_exec and _hurd_exec() in
> Hurd and glib to _hurd_exec_file_name(), which would be appropriate if
> we're deprecating _hurd_exec().

Fixed now.

> It would also be good if you always include a ChangeLog so I can catch
> early errors there too, which hopefully leads to less round-trips.

Writing ChangeLogs still takes me a long time, so I prefer to do it when
the patches are close to finished so I don't need to rewrite them all
the time, at least for big patches. If that's a big issue let me know
and I'll write them all the time.

I've tested the following upgrade scenarios:

* Upgrading only glibc (libc.so + libhurduser.so). System works fine.
  Reboot. System works fine.

* Upgrading glibc (libc.so + libhurduser.so) first and then hurd (exec,
  ext2fs.static, lib{disks,triv,net}fs.so). System works fine. Reboot.
  System works fine.

* Upgrading only hurd (exec, ext2fs.static, lib{disks,triv,net}fs.so).
  System works fine. Reboot. System doesn't boot. The problem is that
  the exec server dies because it needs the file_exec_file_name symbol,
  which is in libhurduser.so, lib*fs.so would have exec_exec_file_name
  unresolvable too... So it's not possible to upgrade just Hurd (which
  is fine IMHO, you need a new glibc to build the new Hurd anyway) unless
  we get into weird tricks OR we move the client side RPCs from
  libhurduser.so to a library built from Hurd.

Regarding version.h, I've bumped HURD_INTERFACE_VERSION in 0001 for
exec_exec_file_name, but should it be bumped in 0002 too?


Emilio Pozuelo Monfort (3):
  Add a new exec_exec_file_name RPC
  Add a file_exec_file_name RPC
  Use the new _hurd_exec_file_name function

 TODO                              |    2 +-
 doc/hurd.texi                     |   22 +++++-----
 exec/exec.c                       |   44 +++++++++++++++++++--
 exec/hashexec.c                   |   41 ++++++++++++++------
 exec/priv.h                       |    3 +-
 hurd/exec.defs                    |   18 ++++++++-
 hurd/fs.defs                      |   27 +++++++++++--
 hurd/hurd_types.h                 |    8 ++--
 hurd/version.h                    |    2 +-
 init/init.c                       |   76 +++++++++++++++++++++++++-----------
 libdiskfs/boot-start.c            |    2 +-
 libdiskfs/file-exec.c             |   70 ++++++++++++++++++++++++++++------
 libfshelp/start-translator-long.c |   23 +++++++----
 libnetfs/file-exec.c              |   63 ++++++++++++++++++++++++++----
 libtrivfs/file-exec.c             |   27 +++++++++++++-
 trans/fakeroot.c                  |   57 +++++++++++++++++++++++++---
 utils/fakeauth.c                  |    6 +-
 utils/login.c                     |   22 +++++++---
 utils/rpctrace.c                  |    4 +-
 utils/shd.c                       |    6 +-
 20 files changed, 408 insertions(+), 115 deletions(-)

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