Need to change a shell command into groovy - jenkins

Question

I've managed to get what docker images have been deployed but it has to be written in groovy.
I have the following:
sh script: '''
export PATH=\"$PATH\":\"${WORKSPACE}\"
for docker-image in interface data keycloak artifactory ; do
DOCKERHOST=`echo ${DOCKERURL}/images-rancher/$docker-image | sed 's!^localhost://!!g'`
DOCKERVERSION=`docker image ls ${DOCKERHOST} --format '{{ json .Tag }}' | head -1`
echo "${DOCKERHOST} - ${DOCKERVERSION}"
done
'''
Changing it into groovy:
def image = [ "interface", "data" , "keycloak", "artifactory" ]
.
.
.
for docker-image in image
println docker-image
How would you put that in a groovy script?
Thanks

Answer 1

Here's how you can get most of the way to using Groovy instead of bash. The doRegexManipulation() function is left as an exercise for you to implement.
Note that the docker image ls sh step is still required, and cannot be translated to "pure" Groovy.
withEnv(["PATH=${env.PATH}:${env.WORKSPACE}"]) {
def images = [ "interface", "data" , "keycloak", "artifactory" ]
for (String docker_image : images) {
def DOCKERHOST = doRegexManipulation("${DOCKERURL}/images-rancher/$docker_image")
def DOCKERVERSION = sh(
script: """docker image ls '${DOCKERHOST}' --format '{{ json .Tag }}' | head -1""",
returnStdout: true,
)
echo "${DOCKERHOST} - ${DOCKERVERSION}"
}​
}
If you wanted to, you can go one step further and replace the head -1 part with Groovy code, since that can be done in Groovy as well.
The withEnv step is documented here. It is used to set environment variables for a block of Groovy code, thereby making those environment variables available to any child processes spawned in the block of Groovy code.