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-[[!meta copyright="Copyright © 2008, 2009 Free Software Foundation, Inc."]]
-
-[[!meta license="""[[!toggle id="license" text="GFDL 1.2+"]][[!toggleable
-id="license" text="Permission is granted to copy, distribute and/or modify this
-document under the terms of the GNU Free Documentation License, Version 1.2 or
-any later version published by the Free Software Foundation; with no Invariant
-Sections, no Front-Cover Texts, and no Back-Cover Texts.  A copy of the license
-is included in the section entitled
-[[GNU Free Documentation License|/fdl]]."]]"""]]
-
-[[!meta title="Server Overriding Mechanism"]]
-
-The main idea of the Hurd is that every user can influence almost all system
-functionality ([[extensible_system|extensibility]]), by running private Hurd
-servers that replace or proxy the global default implementations.
-
-However, running such a customized subenvironment presently is not easy,
-because there is no standard mechanism to easily replace an individual standard
-server, keeping everything else.  (Presently there is only the [[hurd/subhurd]]
-method, which creates a completely new system instance with a completely
-independent set of servers.)
-
-The goal of this project is to provide a simple method for overriding
-individual standard servers, using environment variables, or a special
-subshell, or something like that. It is closely related to the
-[[virtualization]] task.
-
-Various approaches for such a mechanism has been discussed before.
-Probably the easiest (1) would be to modify the Hurd-specific parts of [[hurd/glibc]],
-which are contacting various standard servers to implement certain system
-calls, so that instead of always looking for the servers in default locations,
-they first check for overrides in environment variables, and use these instead
-if present. Take a look at the [socket server overriding
-patch](http://www.assembla.com/spaces/VNetHurd/documents/aJidqKp6ur3z-Nab7jnrAJ/download/A%20patch%20of%20glibc)
-for an example.
-
-A somewhat more generic solution (2) could use some mechanism for arbitrary
-client-side namespace overrides. The client-side part of the filename lookup
-mechanism would have to check an override table on each lookup, and apply the
-desired replacement whenever a match is found.
-
-Another approach would be server-side overrides. Again there are various
-variants. The actual servers themselves could provide a mechanism to redirect to
-other servers on request. (3) Or we could use some more generic server-side
-namespace overrides: Either all filesystem servers could provide a mechanism to
-modify the namespace they export to certain clients (4), or proxies could be
-used that mirror the default namespace but override certain locations. (5)
-
-Variants (4) and (5) are the most powerful. They are intimately related to
-chroots: (4) is like the current chroot implementation works in the Hurd, and
-(5) has been proposed as an alternative. The generic overriding mechanism could
-be implemented on top of chroot, or chroot could be implemented on top of the
-generic overriding mechanism. But this is out of scope for this project...
-
-In practice, probably a mix of the different approaches would prove most useful
-for various servers and use cases. It is strongly recommended that the student
-starts with (1) as the simplest approach, perhaps augmenting it with (3) for
-certain servers that don't work with (1) because of indirect invocation.
-
-This tasks requires some understanding of the Hurd internals, especially a good
-understanding of the file name lookup mechanism. It's probably not too heavy on
-the coding side.
-
-This is [[!GNU_Savannah_task 6612]].  Also there are quite a bit of emails
-discussing this topic, from a previous year's GSoC application -- see
-<http://lists.gnu.org/archive/html/bug-hurd/2007-03/msg00050.html>,
-<http://lists.gnu.org/archive/html/bug-hurd/2007-03/msg00114.html>,
-<http://lists.gnu.org/archive/html/bug-hurd/2007-06/msg00082.html>,
-<http://lists.gnu.org/archive/html/bug-hurd/2008-03/msg00039.html>.
-
-Possible mentors: Olaf Buddenhagen (antrik), Carl Fredrik Hammar (cfhammar)
-
-Exercise: Come up with a glibc patch that allows overriding one specific
-standard server using method (1).