Ian MacLean wrote:
>
> Merrill Cornish wrote:
>
> > Felice,
> >
> > In the new, improved NAnt, properties now have the option of a
> > readonly attirbute. Furthermore, any property set because
> it appeared
> > in a -D:property=value item on the script command line will
> > automatically be readonly. So, you can't change in the script the
> > value of a property passed in via the command line.
> >
> really ? When did that change come in ?
It's in the release notes-in-progress (0.85), General changes...
* Overwriting of read-only properties will now result in a build
failure.
> It doesn't seem right
> that you can't set a default in the build file and have it
> overwritten by the value passed on the commandline. This is a
> fairly common use case. The previous behaviour probably makes
> more sense.
If it's a common use case, then perhaps it should be moved into the
Breaking changes section of the release notes?
The previous behaviour of silently ignoring the property task if the
property is read-only certainly isn't optimal, either. Silently
ignoring tasks can make some bugs hard to trace.
A change to the property statement to remove the breakage:
<property name="junk" value="Development 1.4"
unless="${property::exists('junk')}" />
The above has the addition of being somewhat self-documenting as a
default, in addition to not overwriting non-readonly values of the
property set in other locations in the build file.
With regards to properties set on the commandline being read-only, it
has always been a slight concern to me that you could break a build by
specifying a property that's used internally (and expected to be
non-readonly) on the commandline. I don't know of a good solution to
this, though.
-T
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