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From "Xavier Hanin" <>
Subject Re: override=true in ivy settings
Date Wed, 27 Feb 2008 09:24:01 GMT
On Tue, Feb 26, 2008 at 9:37 PM, Gary Herndon <>

> Hi,
> I recently tried to upgrade from alpha-2 to latest trunk build (from
> 2/21/08) and noticed that I had to add an override="true" to my
> <ivy:settings> ant task.  I did this, and I was able to build my project
> with trunk's ivy, but it broke my old builds (that didn't have
> override=true in them).  These buids are already tagged in my svn
> repository, so I can't change them.  I have installed ivy-alpha-2.jar
> into my build machine's ant_home/lib folder, but I can't update it
> because the old tags wont work.  However, if I don't update it, then I
> can't use latest trunk (which I need for having ${ivy.branch} set
> correctly).
> Any ideas on what I can do?  I don't want to put a copy of the ivy.jar
> file into each project.  I know ivy is in beta and is under no
> obligaction to maintain compatibility with alpha, but is there any
> reason why override can't default to "true"?

We wanted to make people aware of what when settings are overridden. I think
it's a good choice for users who start using Ivy, so I don't like the idea
of changing this default.

IMHO your build system is lacking of a bootstrapping feature: to be able to
ensure reproducibility over time, you need to be able to reproduce an
environment as close as possible to the original one. The best option for
that is to rely on a bootstrapping mechanism which actually get the build
environment, as it was when the original build was performed. This is even
more true when you rely on an alpha version of a software. If your only
problem is Ivy version, you could simply follow the mechanism provided as
example in the go-ivy tutorial: get the version of ivy.jar you want in your
build, and then use it. If you put this in the user home, the download will
only occur once per user and per ivy version.


> Thanks,
> Gary

Xavier Hanin - Independent Java Consultant

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