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antant-contrib

Ant @ variable not resolved

Here is my snippet of build.xml

<target name="compile">
  <for param="rsync.destination.host" list="${file}" delimiter="${line.separator}">
    <sequential>
    <echo message="${rsync.ssh.user}@@{rsync.destination.host}:${rsync.destination.base.dir}/"/>
    </sequential>
  </for>
</target>

I received following output,

compile:
     [echo] root@{rsync.destination.host}:/tmp/
     [echo] root@{rsync.destination.host}:/tmp/

BUILD SUCCESSFUL
Total time: 0 seconds

So here @{rsync.destination.host} variable is not interpreted because of double @@ character. If I put space in between them

    <echo message="${rsync.ssh.user}@ @{rsync.destination.host}:${rsync.destination.base.dir}/"/>

then variable is resolved as expected.

compile:
     [echo] root@ server1:/tmp/
     [echo] root@ server2:/tmp/

BUILD SUCCESSFUL
Total time: 0 seconds

Since there is space in username and server it will through exception if we perform ssh here. Any idea how to solve this problem.

Solution

  • There are no variables in (core) ant, but properties and attributes. @{foo} is the syntax for accessing the value of a macrodef attribute inside a macrodef. As antcontrib for task uses ant macrodef task under the hood it has the same syntax.
    Try with :

    ...
<echo message="${rsync.ssh.user}@@@{rsync.destination.host}:${rsync.destination.base.dir}/"/>
...

    means use 3x @ instead of 2x @
    The param @{rsync.destination.host} has to be masked with a second @, so in fact you need to use @ 3 times.