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I want to rerun, below shell script in the same project, once my build is i completed with errors, so I can rerun my failed test cases in testng-failed.xml.

FILE=./target/surefire-reports/testng-failed.xml
if test -f "$FILE"; then
    echo "$FILE exists."
mvn clean test -Dhttp.proxyHost=proxy-dev.aws.skynet.com -Dhttp.proxyPort=8080 -Dproxy-dev.aws.skynet.com -Dhttps.proxyPort=8080 -Dbrowser="${Browser}" -Dbrowser_version="${browser_version}" -Dos_version="10" -Dos="Windows" -Dlocalrun="false"  -Dtestxml=FILE
else
   echo "$FILE is not there"
fi

But in Jenkins, post build section, I don't see an option to add Execute shell. Please help.

I installed post build plugin , but it's only show for maven projects and not for my free style project.

In free style project, No post steps option.

Answers

I managed a walkaround to do this without any plugins and still run in the Jenkins free style project. Add two execute shells and in first shell enter the below shell commands.

export M2_HOME=/var/jenkins_home/tools/hudson.tasks.Maven_MavenInstallation/Maven3
export PATH=$PATH:$M2_HOME/bin
mvn --version
cd CommonPagesStorage
mvn clean install -DskipTests
cd ..
cd MultiWebdriverDemo
mvn clean test -Dmaven.test.failure.ignore=true -Dsurefire.suiteXmlFiles=TestSuites/${TestPlanName} 
echo "${TestPlanName}is ran"

#Dmaven.test.failure.ignore=true added this so even the script failed it doesn't mark as fail and mark it as unstable and continue.

In the second shell command ,conditionally checks the testng-failed.xml is exists if so run it to run the failed test cases.

cd MultiWebdriverDemo
export M2_HOME=/var/jenkins_home/tools/hudson.tasks.Maven_MavenInstallation/Maven3
export PATH=$PATH:$M2_HOME/bin
mvn --version

#this to print current directory.
echo "the second Script executed from: ${PWD}"

if [ -e ./target/surefire-reports/testng-failed.xml ]
then
    echo "ok file found pass"
    mvn  test -Dmaven.test.failure.ignore=true -Dsurefire.suiteXmlFiles=target/surefire-reports/testng-failed.xml
else
    echo "file not found passed in first attempt ..."
    exit 0
    #exit 0 means forcefully mark it as passed

fi

if [ -e ./target/surefire-reports/testng-failed.xml ]
then
    echo "Rerun also failed exiting with buil state as failure "
    exit 1
 #exit 1 means forcefully mark it as failed
else
    echo "file not found rerun is passed marking the build as passed ..."
     exit 0
fi

S0 even in the second time, my webdriver test case is failed, it's failed build mark as a failure.

[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESS
[INFO] ------------------------------------------------------------------------
[INFO] Total time:  16.199 s
[INFO] Finished at: 2021-08-12T14:05:36Z
[INFO] ------------------------------------------------------------------------
+ [ -e ./target/surefire-reports/testng-failed.xml ]
+ echo Rerun also failed exiting with buil state as failure 
Rerun also failed exiting with buil state as failure 
+ exit 1
Build step 'Execute shell' marked build as failure
Archiving artifacts
TestNG Reports Processing: START
Looking for TestNG results report in workspace using pattern: **/testng-results.xml
Saving reports...
Processing '/var/jenkins_home/jobs/August-FreeStyle/builds/37/testng/testng-results.xml'
100.000000% of tests failed, which exceeded threshold of 0%. Marking build as UNSTABLE
TestNG Reports Processing: FINISH
Finished: FAILURE