如何在Ant解压缩的文件后追加一行？

Question

I have a default log4j properties file to which I want to append an application specific configuration. The file is contained (with other files) within a .zip file. I use Ant to unzip the contents of the zip (including the log4j properties). I want to append the line when the unzip happens. Is this possible?

<unzip dest="some.dest">
    <fileset refid="some.fileset" />
    <!-- Append a line to 'log4j.properties` file -->
</unzip>

Maybe the solution is just to echo after I've unzipped.

Answer 1

You can use the Ant "echo" task with the "append" flag:

<echo file="log4j.properties" append="true">${line.separator}</echo>

Echo task doc here for further reference:

http://ant.apache.org/manual/Tasks/echo.html

Answer 2

No need to unzip the whole zipfile, use

if log4j.properties resides in rootdirectory of zip :

<project>
  <!-- unzip log4j.properties only -->
  <unzip src="foo.zip" dest=".">
    <patternset>
      <include name="log4j.properties" />
    </patternset>
  </unzip>
  <!-- put new key in or overwrite if already existing -->
  <propertyfile file="log4j.properties">
    <entry key="log4j.logger.com.foobar.xyz" value="ERROR" />
  </propertyfile>
  <!-- update zip with modified log4j.properties -->
  <zip destfile="foo.zip" update="true">
    <fileset dir="." includes="log4j.properties" />
  </zip>
</project>

else if log4j.properties resides in any subfolder of zip :

<project>
  <!-- unzip log4j.properties only -->
  <unzip src="foo.zip" dest=".">
    <patternset>
      <include name="**/log4j.properties" />
    </patternset>
  </unzip>
  <fileset dir="." includes="**/log4j.properties" id="foo"/>
  <!-- put new key in or overwrite if already existing -->
  <propertyfile file="${toString:foo}">
    <entry key="log4j.logger.com.foobar.xyz" value="ERROR" />
  </propertyfile>
  <!-- update zip with modified log4j.properties -->
  <zip destfile="foo.zip" update="true">
    <fileset dir="." includes="${toString:foo}" />
  </zip>
</project>