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References: 
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Date: Wed, 5 May 2010 14:46:14 +0100
Message-ID: <p2tdffc72021005050646md640fad7hd1914d2f6c066aa9@mail.gmail.com>
Subject: Re: Better alternative than using foreach, for and if/then/else?
From: Peter Reilly <peter.kitt.reilly@gmail.com>
To: Ant Users List <user@ant.apache.org>
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You need to use ant 1.8 and the <local> task.
<local> declares that a property is local to the current scope,
as defined by the enclosing <target> or <seqential>

see: http://ant.apache.org/manual/CoreTasks/local.html

  <for list=3D"${kernel.currver.variants}" param=3D"kernel.variant"
delimiter=3D" " trim=3D"true">
      <sequential>
        <local name=3D"dir.kernel.build"/>
        <local name=3D"dir.module.build"/>
        <if>
          <equals arg1=3D"@{kernel.variant}" arg2=3D'""' />
         <then>
            <property name=3D"dir.kernel.build"
location=3D"/lib/modules/${kernel.version}/build" />
            <property name=3D"dir.module.build"
location=3D"${dir.build}/output/${kernel.version}" />
          </then>
          <else>
            <property name=3D"dir.kernel.build"
location=3D"/lib/modules/${kernel.version}@{kernel.variant}/build" />
            <property name=3D"dir.module.build"
location=3D"${dir.build}/output/${kernel.version}@{kernel.variant}" />
          </else>

...


Peter

On Wed, May 5, 2010 at 2:24 PM, Bailey, Darragh <dbailey@hp.com> wrote:
>
> Have recently just started using Ant, with the goal to using it as the de=
fault build tool across an entire project. While most of the project will b=
e java based, there are a few parts that won't be and I'm trying to make an=
t work as effectively as possible for these sections.
>
> One of them just happens to be a kernel module. While there will be a mak=
efile called by the Ant target in the end, I'm trying to set Ant up as the =
entry point so that developers moving between different parts of the projec=
t will get the same interface and the same targets to be called. It also si=
mplifies the work around a continuous build tool, in that it doesn't have t=
o run differently for the different components.
>
>
> For the kernel module build, I'm trying to allow for more than 1 kernel v=
ersion and different kernel variants. In most cases the kernel version will=
 be 2.6.18-194.el5 (RHEL5 Update 5 kernel) and the variant will be the defa=
ult. However at times developers will want to build against multiple kernel=
 versions and/or variants when developing/debugging issues.
>
> Examples:
> Default Properties
> kernel.versions =3D 2.6.18-194.el5
> kernel.variants =3D ""
>
> Additionally "kernel.${kernel.version}.variants =3D xxx" can be used to s=
pecify the variants for a particular version, rather than using the default=
 set. I use "" to represent the default variant simply because that is the =
method that works best when building kmod-* rpm packages as I'm using a spe=
c template similar to what fedora uses.
>
> Properties set by a Developer
> kernel.versions =3D 2.6.18-194.el5 2.6.33-k.org
> kernel.variants =3D ""
> kernel.2.6.18-194.el5.variants =3D xen
>
>
>
> Coming from a make background I was previously used to expanding targets =
dynamically based on values set in properties in the makefile in order to r=
eference multiple kernel versions and variants and then using pattern based=
 rules to build the necessary target. Right now I've got something partiall=
y working in Ant using the foreach/for tasks from ant-contrib, but I'm not =
sure that this is the best way to accomplish this. I'm also using if/the/el=
se to work around the use of "" which Ant doesn't really like when it comes=
 to specifying an empty value for a property.
>
> I know I have a bug in the xml below, in that the for loop I attempt to c=
hange properties which by default Ant won't overwrite after setting them in=
itially. Like I mentioned before I'm very much used to make and I've yet to=
 fully get to grips with Ant.
>
>
> Any suggestions on other Ant tasks that could simplify this would be very=
 welcome:
>
>
> =C2=A0<target name=3D"compile" if=3D"isLinux"
> =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0description=3D"Compile the source again=
st all requested kernel versions and variants">
> =C2=A0 =C2=A0<!-- determine the default kernel version, only set if not a=
lready set -->
> =C2=A0 =C2=A0<exec executable=3D"uname" outputproperty=3D"kernel.versions=
">
> =C2=A0 =C2=A0 =C2=A0<arg value=3D"-r" />
> =C2=A0 =C2=A0</exec>
> =C2=A0 =C2=A0<foreach target=3D"compile-module" list=3D"${kernel.versions=
}" delimiter=3D" " param=3D"kernel.version" />
> =C2=A0</target>
>
>
> =C2=A0<!-- default compile task, restrict to running on linux also try to=
 avoid rebuilding if
> =C2=A0 =C2=A0 =C2=A0it has already been compiled and the sources have not=
 be modified.
>
> =C2=A0 =C2=A0 =C2=A0TODO:
> =C2=A0 =C2=A0 =C2=A0 =C2=A0Handle if different kernel version or variants=
 used
> =C2=A0 =C2=A0 =C2=A0 =C2=A0Handle building for multiple variants
> =C2=A0 =C2=A0 =C2=A0 =C2=A0Handle building for multiple kernel versions
>
> =C2=A0 =C2=A0 =C2=A0 =C2=A0Compile the source against the specified kerne=
l version and variant
> =C2=A0-->
> =C2=A0<target name=3D"compile-module" depends=3D"init" if=3D"isLinux" >
>
>
> =C2=A0 =C2=A0<!-- Will set the variants to the default value only if not =
already set (i.e. doesn't override) -->
> =C2=A0 =C2=A0<property name=3D"kernel.${kernel.version}.variants" value=
=3D"${kernel.variants}" />
> =C2=A0 =C2=A0<propertycopy property=3D"kernel.currver.variants" override=
=3D"true" from=3D"kernel.${kernel.version}.variants" />
>
> =C2=A0 =C2=A0<for list=3D"${kernel.currver.variants}" param=3D"kernel.var=
iant" delimiter=3D" " trim=3D"true">
> =C2=A0 =C2=A0 =C2=A0<sequential>
> =C2=A0 =C2=A0 =C2=A0 =C2=A0<if>
> =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0<equals arg1=3D"@{kernel.variant}" arg2=
=3D'""' />
> =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0<then>
> =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0<property name=3D"dir.kernel.bui=
ld" location=3D"/lib/modules/${kernel.version}/build" />
> =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0<property name=3D"dir.module.bui=
ld" location=3D"${dir.build}/output/${kernel.version}" />
> =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0</then>
> =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0<else>
> =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0<property name=3D"dir.kernel.bui=
ld" location=3D"/lib/modules/${kernel.version}@{kernel.variant}/build" />
> =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0<property name=3D"dir.module.bui=
ld" location=3D"${dir.build}/output/${kernel.version}@{kernel.variant}" />
> =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0</else>
> =C2=A0 =C2=A0 =C2=A0 =C2=A0</if>
> =C2=A0 =C2=A0 =C2=A0 =C2=A0<!--<property name=3D"kernel.arch" />-->
> =C2=A0 =C2=A0 =C2=A0 =C2=A0<echoproperties prefix=3D"name."/>
> =C2=A0 =C2=A0 =C2=A0 =C2=A0<echoproperties prefix=3D"dir."/>
> =C2=A0 =C2=A0 =C2=A0 =C2=A0<echoproperties prefix=3D"kernel."/>
> =C2=A0 =C2=A0 =C2=A0 =C2=A0<echo message=3D"kernel.variant=3D'@{kernel.va=
riant}'" />
> =C2=A0 =C2=A0 =C2=A0 =C2=A0<!-- Copy the src to a directory under the bui=
ld directory, excluding hidden files -->
> =C2=A0 =C2=A0 =C2=A0 =C2=A0<copy todir=3D"${dir.module.build}">
> =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0<fileset dir=3D"${dir.src}">
> =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0<exclude name=3D"**/.*" />
> =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0</fileset>
> =C2=A0 =C2=A0 =C2=A0 =C2=A0</copy>
>
> =C2=A0 =C2=A0 =C2=A0 =C2=A0<!-- execute the require make command, specify=
ing the kernel directory to use -->
> =C2=A0 =C2=A0 =C2=A0 =C2=A0<exec executable=3D"make">
> =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0<arg value=3D"-C" />
> =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0<arg value=3D"${dir.kernel.build}" />
> =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0<arg value=3D"M=3D${dir.module.build}" =
/>
> =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0<arg value=3D"modules" />
> =C2=A0 =C2=A0 =C2=A0 =C2=A0</exec>
> =C2=A0 =C2=A0 =C2=A0</sequential>
> =C2=A0 =C2=A0</for>
> =C2=A0</target>
>
>
>
> --
> Regards,
> Darragh Bailey
>
> Systems Software Engineer
> Hewlett Packard Galway Ltd.
>
> Postal Address:=C2=A0=C2=A0=C2=A0 Hewlett Packard Galway Limited, Ballybr=
it Business Park, Galway
> Registered Office: Hewlett Packard Galway Limited, 63-74 Sir John Rogerso=
n's Quay Dublin 2
> Registered Number: 361933
>
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