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Posted to dev@ant.apache.org by mattf <ma...@hotmail.com> on 2010/10/22 01:49:10 UTC
How to fail if property expansion failed...
In perl I would say:
map {
die "missing library $1" if /\$\{libs\.(.+)\.classpath\}/
} @classpath;
and get the feature that if property expansion failed, the build would halt
with a meaningful error message.
In ant:
<filterchain>
<expandproperties/># doesn't support failonerror attribute
</filterchain>
<fail message="missing library ${missing.library}">
<condition property="missing.library"> # doesn't support property
attribute
<matches pattern="libs\.(.+)\.classpath"
string="${libs.list.classpath}"/> # doesn't support property attribute
</condition>
</fail>
<path path="${classpath}">
<existing/> # does not fail if unset pathelement
</path>
How can I fail cleanly if the classpath could not be loaded?
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Re: How to fail if property expansion failed...
Posted by Gilbert Rebhan <gi...@maksimo.de>.
-------- Original Message --------
Subject: Re: How to fail if property expansion failed...
From: mattf <ma...@hotmail.com>
To: dev@ant.apache.org
Date: 22.10.2010 23:39
>
> I was hoping to avoid introducing additional requirements, such as antcontrib
> or Ivy.
[..]
> Yes, sort of; a library property is a list of jars, a library-list names
> those properties by name; and is passed to classpath after expansion to the
> actual jars, and relative names expanded. If the expansion fails, then the
> origin list named an undeclared property, and the name-form (${name}) is
> passed to classpath, indicating failure. Now, I want ant to fail when
> failure is indicated.<p/>
use fail combined with a nested condition, something like=
<fail message="F a i l u r e => $${yourlibproperty} not set!!">
<condition>
<not>
<isset property="yourlibproperty"/>
</not>
</condition>
</fail>
Regards, Gilbert
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Re: AW: How to fail if property expansion failed...
Posted by mattf <ma...@hotmail.com>.
I was hoping to avoid introducing additional requirements, such as antcontrib
or Ivy.<p/>The list is a merge of two files, one global property list of
libs that have names that dereference to a list of jars (produced and
managed by an external program); and one local -- just part of that name.
These artifacts are introduced in ant as
<loadfile><filterchain><expandproperties/>...<p/>
Then processed by <pathconvert><path><existing/>...<p/>
Thus, the list would have pathsep, not comma; but maybe that doesn't
matter.<p/>
Jan Matèrne-2 wrote:
>
> - you have defined a list of libraries (@classpath) which you require
>
Yes, sort of; a library property is a list of jars, a library-list names
those properties by name; and is passed to classpath after expansion to the
actual jars, and relative names expanded. If the expansion fails, then the
origin list named an undeclared property, and the name-form (${name}) is
passed to classpath, indicating failure. Now, I want ant to fail when
failure is indicated.<p/>
Isn't there something in ant core that will help?<p/>
A loop isn't actually required, and for lack of a better solution pattern
matching the whole text is also possible.
<code>
<fail message="missing library ${missing.library}">
<condition>
<matches pattern="libs\.(.+)\.classpath"
string="${libs.list.classpath}"/>
</condition>
</fail>
</code>
Will give me the full stop I desire, but how can I set the property
${missing.library} to the value of the capture at (.+)?
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AW: How to fail if property expansion failed...
Posted by Jan Matèrne <ap...@materne.de>.
Ok, after searching for the perl map function this is what I understand:
- you have defined a list of libraries (@classpath) which you require
- you want to fail if one of these libs is missing
Simply I would define a list (comma separated or one-per-line) and iterate
with antcontrib:for.
<ac:for param="lib" list="${required.libs}">
<sequential>
<fail message="@{lib} missing"><not><available .../>
(not checked deeper ;-)
But instead of defining a list of jars you _want_ to have, why not define a
list and let the build system (more precisely the dependency manager) _get_
this list?
With Ivy
- define the "list" in ivy.xml
- use the Ivy Ant tasks (ivy:cachepath, ...) for creating a path with these
defined libs (and downloading them if needed)
Jan
> -----Ursprüngliche Nachricht-----
> Von: mattf [mailto:mattf64@hotmail.com]
> Gesendet: Freitag, 22. Oktober 2010 01:49
> An: dev@ant.apache.org
> Betreff: How to fail if property expansion failed...
>
>
> In perl I would say:
>
> map {
> die "missing library $1" if /\$\{libs\.(.+)\.classpath\}/
> } @classpath;
>
>
> and get the feature that if property expansion failed, the build would
> halt
> with a meaningful error message.
>
> In ant:
>
> <filterchain>
> <expandproperties/># doesn't support failonerror attribute
> </filterchain>
>
> <fail message="missing library ${missing.library}">
> <condition property="missing.library"> # doesn't support property
> attribute
> <matches pattern="libs\.(.+)\.classpath"
> string="${libs.list.classpath}"/> # doesn't support property attribute
> </condition>
> </fail>
>
> <path path="${classpath}">
> <existing/> # does not fail if unset pathelement
> </path>
>
> How can I fail cleanly if the classpath could not be loaded?
>
> Is this item helpful? yes no Previous votes Yes: 0 No: 0
>
> --
> View this message in context: http://ant.1045680.n5.nabble.com/How-to-
> fail-if-property-expansion-failed-tp3231557p3231557.html
> Sent from the Ant - Dev mailing list archive at Nabble.com.
>
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