The create_file.groovy file contains the Groovy script that runs the step's command.

Groovy is a dynamic scripting language (similar to Python, Ruby, and Perl) for the Java™ platform. Most Java code is also syntactically valid Groovy, which makes Groovy popular with Java programmers. Groovy provides native support for regular expressions.

The first lines of the script create a properties object, props. Then it attempts to load the properties from the file that is sent from the server (specified by the ${PLUGIN_OUTPUT_PROPS} variable). If it can load the file, it populates props; otherwise, it throws an exception.

final def workDir = new File('.').canonicalFile
final def props = new Properties();
final def inputPropsFile = new File(args[0]);
try {
inputPropsStream = new FileInputStream(inputPropsFile);
catch (IOException e) {
throw new RuntimeException(e);

To run the command (create a file), the script uses the properties that are defined by the step itself. The script retrieves the three properties from props and creates corresponding local variables.

Next, the script creates a file with a name specified by fileName, and tests the overwrite Boolean variable. If a file with the same name exists and overwrite is false, the script ends (fails) with an exit code of 1. Exit codes can be examined during post-processing.

Otherwise, the file is written with the content of contents. A message is written to the output log, and the exit code is set to 0 (success).

final def fileName = props['file']
final def overwrite = props['overwrite']?.toBoolean()
final def contents = props['contents']?:''

try {
def file = new File(fileName).canonicalFile
if (file.exists() && !overwrite) {
println "File $file already exists!"
System.exit 1
else {
println "Successfully ${overwrite?'replaced':'created'} file 
$file with contents:"
println contents
catch (Exception e) {
println "Error creating file $file: ${e.message}"


Parent topic: Step commands