Ant Job Clone script

Ant target to clone a Template Hudson Job remotely

If you have a subversion repository that conforms to the suggestions laid down by the pragmatic programmers, then this ant target should allow you to trivially create Jobs on Hudson based on a template job and the current branch that your working copy is in.

I hope someone out there finds this useful. There are no dependencies on anything other than Ant and Subversion, but unfortunately due to the lack of a decent POST task there is a dependency on a Java+Ant combination that supports script tasks of type javascript (sorry).

This script could probably be improved especially around the regular expression replacements, a filter chain would probably be better.

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Copyright (c) 2009, Ciaran Jessup
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<project name="OurProject" default="build" basedir=".">
    <property name="hudsonServer" value="http://hudsonServer/hudson"/>
    <property name="ciTemplate" value="CITemplateJobName"/>
    <property name="hudson_config_file" value="temp_hudson_ci_config_file.xml" />
    <target name="build">
        <exec executable="svn" outputproperty="svnlog_out">
            <arg line="info"/>
        </exec>
		<script language="javascript"><![CDATA[
			branchURLPattern= /^\sURL:\s+(.+\/branches\/([^\s\/]+))\/?.*/m
                        matches= svnlog_out.match(branchURLPattern);
			project.setNewProperty("branchURL", matches[1] );
			project.setNewProperty("branchName", matches[2] );
		]]></script>

        <!-- test to see if the CI build for this branch has been created yet -->
        <delete file="${hudson_config_file}" failonerror="false"/>
        <get src="${hudsonServer}/job/${branchName}/config.xml" dest="${hudson_config_file}" ignoreerrors="true"/>
        <available file="${hudson_config_file}" type="file" property="branch.already.present"/>
        <fail if="branch.already.present" message="${branchName} already has a CI Build on Hudson"/>
        <echo message=""/>
        <echo message=""/>
        <echo message ="Found URL TO SVN: ${branchURL}"/>
        <echo message ="Determined Branch name to be: ${branchName}"/>
        <echo message=""/>
        <!-- Ask the user to see if they really do want to carry on -->
        <input message="Are you sure you want to create a CI build on hudson for ${branchName} (y/n)?"
                 validargs="y,n"
                 addproperty="do.delete"/>
        <condition property="do.abort">
                <equals arg1="n" arg2="${do.delete}"/>
        </condition>
        <fail if="do.abort">CI Build creation aborted by user.</fail>

        <!-- Create the new job based on the templated job -->
        <antcall target="_doPost">
            <param name="url" value="${hudsonServer}/createItem?name=${branchName}&mode=copy&from=${ciTemplate}"/>
        </antcall>

        <!-- Update the job configuration -->
        <get src="${hudsonServer}/job/${branchName}/config.xml" dest="${hudson_config_file}"/>
        <replaceregexp file="${hudson_config_file}" match="<description>.+</description>" replace="<description>The ${branchName} branch</description>"/>
        <replaceregexp file="${hudson_config_file}" match="<remote>.+</remote>" replace="<remote>${branchURL}</remote>"/>
        <replaceregexp file="${hudson_config_file}" match="<local>.+</local>" replace="<local>${branchName}</local>"/>

        <!-- post our modified configuration back to hudson -->
        <loadfile property="hudson_ci_config" srcFile="${hudson_config_file}"/>
        <antcall target="_doPost">
            <param name="url" value="${hudsonServer}/job/${branchName}/config.xml"/>
            <param name="data" value="${hudson_ci_config}"/>
        </antcall>

        <!-- Finally enable the job -->
        <antcall target="_doPost">
            <param name="url" value="${hudsonServer}/job/${branchName}/enable"/>
        </antcall>

        <!-- Be a good citizen and delete our temp file -->
        <delete file="${hudson_config_file}" failonerror="false"/>
    </target>

    <target name="_doPost">
        <script language="javascript"><![CDATA[
            importPackage(java.net);
            importPackage(java.io);
            importClass(java.lang.StringBuffer);

            url= new URL(project.getProperty("url"));
            conn = url.openConnection();
            conn.setRequestMethod( "POST" );
            conn.setDoOutput(true);

            data= project.getProperty("data");
            if( data ) {
                conn.setRequestProperty("Content-Length", "" +data.getBytes().length);
            }
            wr = new OutputStreamWriter(conn.getOutputStream());
            if( data ) {
                wr.write(data);
            }
            wr.flush();
            wr.close();

            // Get the response
            try {
                rd = new BufferedReader(new InputStreamReader(conn.getInputStream()));
                stringBuffer= new StringBuffer();
                var line;
                while ((line = rd.readLine()) != null) {
                    stringBuffer.append(line+"\n"); // Gonna mess with linebreaks here..shame.
                }
                // None of the targets above care about the response so just forget about it :)
            }catch( e ) {} //swallowed, hudson really doesn't like these empty posts..

        ]]></script>
    </target>
</project>