Jenkins Pipeline - Reading previous stage log

Question

Consider a Jenkins Pipeline with two stages, Stage A then Stage B.

In Stage B, is it possible to parse the logs of Stage A for some particular text?

Answer 1

Use tee to split the output to both stdout and file. Next parse the file for your text.

STAGE_A_LOG_FILE = 'stage_a.log'

pipeline {
    agent any
    stages {
        stage('Stage A') {
            steps {
                script {
                    // tee log into file
                    tee(STAGE_A_LOG_FILE) {
                        echo 'print some Stage_A log content ...'
                    }
                }
            }
        }
        stage('Stage B') {
            steps {
                script {
                    // search log file for 'Stage_A'
                    regex = java.util.regex.Pattern.compile('some (Stage_A) log')
                    matcher = regex.matcher(readFile(STAGE_A_LOG_FILE))
                    if (matcher.find()) {
                        echo "found: ${matcher.group(1)}"
                    }
                }
            }
        }
    }
}

Pipeline output:

print some Stage_A log content ...
found: Stage_A
Finished: SUCCESS