I need a way to get a list of plugins so that I can use them with [docker jenkins](https://hub.docker.com/_/jenkins/) 
in the format `<plugin>: <version>` 

## 1. get the jenkins cli.

The jenkins CLI will allow us to interact with our jenkins server from the command line. We can get it with a simple curl call.

```
curl 'localhost:8080/jnlpJars/jenkins-cli.jar' > jenkins-cli.jar
```

## 2. create a groovy script.

We need to create a groovy script to parse the information we receive from the jenkins API. This will output each plugin with its version. Save the following as `plugins.groovy`. 

```
def plugins = jenkins.model.Jenkins.instance.getPluginManager().getPlugins()
plugins.each {println "${it.getShortName()}:${it.getVersion()}"}
```

## 3. call the Jenkins API.

Use jenkins-cli.jar to call the jenkins server where it is located (localhost:8080) in this case with the username and password you use for login and then output the results to plugins.txt

```
java -jar jenkins-cli.jar -s http://localhost:8080 -auth admin:<password> groovy = < plugins.groovy > plugins.txt
```

The output looks like this

```
trilead-api:1.0.6
gradle:1.36
cloudbees-folder:6.12
workflow-basic-steps:2.20
antisamy-markup-formatter:2.0
branch-api:2.5.6
jdk-tool:1.4
structs:1.20
handlebars:1.1.1
workflow-step-api:2.22
token-macro:2.12
```

Enjoy!