4 Sep
2007
4 Sep
'07
8:37 a.m.
Hi Paul,
On Sep 4, 2007, at 8:22 AM, Paul Armstrong wrote:
On Wed, Aug 29, 2007 at 10:49:34AM +0200, Thomas
Drevon wrote:
This is indeed a very interesting topic for which we need to do 2
things:
1) Work on making it easier to upgrade XWiki versions
2) Document best practices for upgrading
I had started doing so here: http://www.xwiki.org/xwiki/bin/view/
AdminGuide/Installation#HUpgradinganexistingwiki
However it deserves a proper page on xwiki.org, in the admin guide.
Would you be interested in starting such a page there? (if so please
go ahead) so that everyone can add to it?
So far, we've listed 2 practices in this thread:
1) Avoid touching Templates and skin files.
2) Avoid modifying default pages in the XWiki space. If you do the
best practice I think is to leave the current page as is and instead
copy it to a new page and then use that page.
What I'd love to see in the future is the following:
A) Separate the default XWiki Enterprise XAR into a set of small
application XAR. I've started defining them (see the components
defined in JIRA for the XWiki Enterprise project)
B) Implement an Application manager application to manage upgrading
applications. See http://www.xwiki.org/xwiki/bin/view/Idea/
ApplicationManager (implementation is old but specification is still
ok). I guess there could be a comparison done on application pages
and if a change is found in the user wiki then a window asking which
version to use would pop up with a diff of the 2 versions.
C) A new skin that is easy to extend and which offers extension
points. I know work has been started on this by Laurent Lunati but I
don't know when it'll be done. In the further future, we'll need to
implement some UI extension capability such as: http://
www.nabble.com/-ArchitectureV2--UI-Interfaces-tf3432811.html#a9569729
Thanks
-Vincent
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Pavel Kolesnikov wrote:
What do you suggest for customizing things that are stored in .vm
files
in the skins directory rather than the database?
The other thing that I find makes updates significantly harder is
if you
update pre-defined pages. For example, editing Blog.Macros causes
me to
go through some pain every time I do an update. One more question: is there any
mechanism/best-practice how to
keep my
Xwiki extensions (plugins, Xwiki classes, templates, ...)
isolated somehow
to make future upgrades of Xwiki as easy as possible?
Yes. In my opinion, only do changes to your xwiki instance by
1. Editing pages (e.g. html or velocity). These changes consists of
updating your database, and will thus survive an xwiki update.
However,
should the database structure change (dunno how often this
happens) you
are of course in trouble.
2. Write homebrew java plugins (package as jar and copy into
WEB-INF/lib/) which you invoke from xwiki pages.
Under no circumstance edit .vm files. This may seem like at decent
idea
at first, but will gradually make upgrade something you will try to
avoid. Which of course is the opposite of progress.