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/**************************************************************************/
[task #118] Full Item Snapshot:

URL: <http://gna.org/task/?func=detailitem&item_id=118>
Project: Gna! Administration
Submitted by: Mathieu Roy
On: lun 02.02.2004 � 01:58

Should Start On:  lun 02.02.2004 � 00:00
Should be Finished on:  mer 02.02.2005 � 00:00
Category:  Services Functionalities
Priority:  1 - Later
Resolution:  None
Privacy:  Public
Assigned to:  zerodeux
Percent Complete:  0%
Status:  Open
Effort:  0.00


Summary:  subversion support

Original Submission:  Gna! should support subversion as alternative to arch.

Commentaires
------------------


-------------------------------------------------------
Date: lun 13.09.2004 � 12:15        By: Timothee Besset <ttimo>
looks like we don't have any ETA of this happening anymore

-------------------------------------------------------
Date: lun 06.09.2004 � 04:34        By: Eugene Sizikov <eugene_beast>
Hello again!

So, did Timo won a free beer? :).

-------------------------------------------------------
Date: ven 13.08.2004 � 09:59        By: Vincent Caron <zerodeux>
Hello people,



I regret I don't have the time to work on this, this is especially bad since Timo is 
ready to give a hand. My daily job planning totally got out of control.



I'm having real vacations starting from tomorrow, for 10 days. What I'll do is setup 
the chroot for Timo and help him in two weeks. If it's not done, Timo wins a free beer 
:).



BTW, could also be the occasion to have our first Sarge subsystem, I guess Woody won't 
be enough for proper svn support.

-------------------------------------------------------
Date: mar 10.08.2004 � 17:56        By: Elfyn McBratney <beu>
Does this have to be done on the Gna! machines?  If not, I can try and set-up a Debian 
chroot on one of my boxes, if that might help things :)

-------------------------------------------------------
Date: mar 10.08.2004 � 15:14        By: Timothee Besset <ttimo>
Actually zerodeux is not on vacation, he is just very busy with real life. I would 
have some time to spare to get this started, but I can't do anything without a 
chrooted box to work from.

-------------------------------------------------------
Date: mar 10.08.2004 � 15:07        By: Elfyn McBratney <beu>
Most of (all?) the Gna! admins that are working on this are on a well deserved 
holiday.  I guess they should have known taking a holiday in the sun would upset you..

-------------------------------------------------------
Date: mar 10.08.2004 � 11:51        By: Eugene Sizikov <eugene_beast>
Hello, there!

I'm unhappy to see than SVN doesn't work till now, when task #500 'is almost 
complete...' and so on ;(

-------------------------------------------------------
Date: jeu 17.06.2004 � 10:55        By: Vincent Caron <zerodeux>
Hello,



  sorry, there is still a dependent task I need to finish (improve the remote backup), 
and I need to be able to allocate a large contiguous chunk of time for this. Which was 
kind of hard those last two weeks :(.



  I'm still commited to setup that svn thing, I promiss :).

-------------------------------------------------------
Date: jeu 17.06.2004 � 03:24        By: Eugene Sizikov <eugene_beast>
Again, how it's going? Two weeks are gone...

-------------------------------------------------------
Date: sam 29.05.2004 � 16:53        By: Timothee Besset <ttimo>
We'll start setting up an experimental server for subversion stuff within the next two 
weeks I think. atm it mostly depends on zerodeux's availability, and after that it 
will depend on mine

-------------------------------------------------------
Date: sam 29.05.2004 � 15:54        By: Eugene Sizikov <eugene_beast>
So, how it's going? I sorta like Subversion and waiting for its presence here at Gna! 
for bookeeping my project. When it's planned to got worked?

-------------------------------------------------------
Date: mar 18.05.2004 � 10:08        By: Vincent Caron <zerodeux>
I've assigned two dependencies to this item :



  * have a stable remote backup

  * have updated admin docs



I'll do my best to fullfill them before the end of the month. It's just there to help 
boring things to be done, and keep the general idea to only push an experiment when 
everything else is rock solid.



-------------------------------------------------------
Date: lun 17.05.2004 � 17:22        By: Timothee Besset <ttimo>
Discussed with the svn developers for a bit, and I have some kind of plan together. As 
I expected, they recommend DAV for scalability/stability.



There would be two root <Location> in apache conf, one under  http for read only 
(along with an online repository browser), and one under an https for read write.



Using svnparentpath we can have a single <Location> and all the project repositories 
stored below a single directory.



The read-write control would be performed through a pre-commit hook I think, as it 
would work with svn over ssh as well, and is probably needed considering the current 
user accounts strategy

-------------------------------------------------------
Date: jeu 13.05.2004 � 14:07        By: Vincent Caron <zerodeux>
Incidentally, someone from Xiph would be interested in a 'GNUish forge' with 
subversion support :

http://mail.gnu.org/archive/html/savannah-dev/2004-05/msg00035.html

-------------------------------------------------------
Date: mer 12.05.2004 � 21:25        By: Timothee Besset <ttimo>
I would expect a good setup to be fairly low maintenance. There are a few things to 
watch out for. If you consider Alioth, they had an appalling permissions policy which 
was causing regular repository lockups.



For good scalability, the SVN developers recommend DAV transport (http/https) over 
svnserve (ssh). I commonly use https for write access, SVN supports client 
certificates but I never actually tried it. We can have ssh write access, but it will 
involve a careful setup of permissions and umask.

-------------------------------------------------------
Date: mer 12.05.2004 � 21:25        By: Timothee Besset <ttimo>
I would expect a good setup to be fairly low maintenance. There are a few things to 
watch out for. If you consider Alioth, they had an appalling permissions policy which 
was causing regular repository lockups.



For good scalability, the SVN developers recommend DAV transport (http/https) over 
svnserve (ssh). I commonly use https for write access, SVN supports client 
certificates but I never actually tried it. We can have ssh write access, but it will 
involve a careful setup of permissions and umask.

-------------------------------------------------------
Date: mer 12.05.2004 � 20:21        By: Mathieu Roy <yeupou>
For testing, why not doing that on maggie indeed. 

But I insist on the fact that maggie should at no cost run real public services.

Apart from that, I read that SVN was frequently broken wherever it is provided. 
Installing it is one task, but maintaining is another. It would be nice if Timothee 
can devote time to install it but it cannot work if he does not have time to also 
maintain it on the long run.

-------------------------------------------------------
Date: mer 12.05.2004 � 16:13        By: Vincent Caron <zerodeux>
I'd propose to setup a Woody in a chroot'ed environment in our spare machine (ie. 
Maggie), and have Timo install a SVN setup and try to write the Savane/SVN backend 
(account creation, backup, etc).



If 1) it works, 2) we have a free IP to dedicate to this service (ports: http{s}, ssh, 
?), 3) we can buy a dedicated machine, it could be a new official Savane service. I'm 
not firm on #3, we'll see the machine load by then.



BTW, I've known Timo for a long time and trust him. He maintains ID Software's GPL'ed 
level editor Gtk-Radiant as well as GNU/Linux ports of their (closed source, yes:)) 
games. He's been closely involved with SVN and its community for more than 2 years.



-------------------------------------------------------
Date: mer 12.05.2004 � 11:29        By: Timothee Besset <ttimo>
any progress on that one?

-------------------------------------------------------
Date: jeu 11.03.2004 � 11:40        By: Timothee Besset <ttimo>
I have noticed that some other sourceforge forks have started providing SVN access. I 
don't know which codebase gna uses exactly. 
http://developer.berlios.de/forum/forum.php?forum_id=4718



Anyway, to answer (partly) your questions:



- storage: GtkRadiant repository (https://zerowing.idsoftware.com:666/) has 4320 
revisions, and uses 1.1Gb. 



It's a fairly large repository, as it was converted from a CVS repository, after 4 
years of active developement, and is used to store binary media as well as source 
code. SVN tends to be bigger though. Got an account of 120Mb -> 150Mb. Expect a size 
increase around 20%.



The storage is berkeley db, so it's a single large random access file.



- backup:

SVN provides a hot-backup.py script which can be used and extended. It does a hotcopy 
to duplicate the repository. I run it croned daily. Only doing hot-backup when the 
repository changes.



- CPU load. for regular usage, backups, viewsvn .. hard to estimate. The same box ( P3 
600Mhz ) we started GtkRadiant on CVS, we are still using with SVN. SVN generally 
performs better for users for your server CPU cycles. Word on the street is that it's 
less CPU intensive ( HD bound? ) + 'costs are proportional to change size, not data 
size', which is not true for CVS.



- security / permissions etc.

the svnserve protocol doesn't offer much for permissions. It has an anonymous mode (no 
write), and otherwise uses the permissions it is executed as. They plan to improve on 
that, but the DAV way offers fine grained access already.



I can't say I'm a big fan of ssh for transport. It makes things fairly hard to setup 
for windows users, which is my main problem with it. DAV over https, with client 
certificates .. makes things about as secure as an ssh access anyway.



- web interfaces to repository:



ViewCVS: Requires the python bindings. I gave up using it on GtkRadiant, as it locks 
me up ( 
http://sourceforge.net/tracker/index.php?func=detail&aid=895294&group_id=18760&atid=118760
 )



SVN::Web: uses the python bindings. Is more bare-bones than ViewSVN, but a good 
alternative. That's what I'm running now, but it has scalability issues on repos with 
a lot of branches.



Chora: requires php, word is Chora as experimental SVN support.



The web interfaces will likely be causing most of the load.



- cvsreport-like:

There are contributed scripts in the SVN repository. I have one with web URLs which I 
can contribute. It's much easier to write that stuff with SVN than it is with CVS.

-------------------------------------------------------
Date: jeu 11.03.2004 � 10:21        By: Vincent Caron <zerodeux>
Let's try to detail a bit, we need :



- storage: what is the disk usage ratio between a CVS and SVN repository for the same 
source tree ? What are bandwidth issues (lots of small scattered files ? heavily 
random access ?)



- backup: svnadmin dump or hotcopy ? Need some insight (time, load, compression).



- CPU cycles: difficult to estimate. Right now we only have 90 projects and the CVS 
server is lightly loaded (0.1 average). What is the load ratio between CVS and SVN for 
the same source tree and usage ?



- init: need to hook a 'svnadmin create' in the group creation backend.



- security: preferred transport will be SSH, user & group rights should work as they 
are now. Expecting WebDAV when there is a dedicated server for SVN.



- helpers: ViewCVS 1.0-cvs supports SVN. Needs a cvsreport-alike.



Comments/addition welcome.



-------------------------------------------------------
Date: mar 10.02.2004 � 17:32        By: Timothee Besset <ttimo>
do you have a roadmap at this point? 




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