How to run a single jenkinsfile for specific github components - jenkins

Question

I want to be able to execute specific components that I organized in Files in the repository with only one main jenkinsfile.
For example I have this repo structure:
And I have three different components: Topic_A, Topic_B, Topic_C (same type of components but will be created for different teams).
I want to be able to modify only Topic_A and C and after I push the branch I want my jenkinsfile to able to execute just those changes instead also redeploying Topic_B which it was not modified.
My question is if this possible? Could it be done with a jenkins pipeline? or any other component? (script)
Thank you.

Answer 1

There is a changeset directive that allows you to check whether a file has changed in the Git repository. But it doesn't support checking directories, hence you can do something like the below.
pipeline {
agent any
stages {
stage('Cloning') {
steps {
// Get some code from a GitHub repository
git branch: 'main', url: 'https://github.com/xxxx/sample.git'
}
}
stage('TOPIC_A') {
when { expression { isChanged("Topic_A") } }
steps {
echo 'Doing something for Topic A'
}
}
stage('TOPIC_B') {
when { expression { isChanged("Topic_B") } }
steps {
echo 'Doing something for Topic B'
}
}
}
}
def isChanged(dirName) {
def changeLogSets = currentBuild.changeSets
def folderName = dirName
for (int i = 0; i < changeLogSets.size(); i++) {
def entries = changeLogSets[i].items
for (int j = 0; j < entries.length; j++) {
def entry = entries[j]
def files = new ArrayList(entry.affectedFiles)
for (int k = 0; k < files.size(); k++) {
def file = files[k]
if(file.path.contains(folderName)){
return true
}
}
}
}
return false
}