Get username logged in Jenkins from Jenkins Workflow (Pipeline) Plugin

Question

I am using the Pipeline plugin in Jenkins by Clouldbees (the name was Workflow plugin before), I am trying to get the user name in the Groovy script but I am not able to ach

Answer 1

//Below is a generic groovy function to get the XML metadata for a Jenkins build.
//curl the env.BUILD_URL/api/xml parse it with grep and return the string
//I did an or true on curl, but possibly there is a better way
//echo -e "some_string \c" will always return some_string without \n char     
//use the readFile() and return the string
def GetUserId(){
 sh """
 /usr/bin/curl -k -s -u \
 \$USERNAME:\$PASSWORD -o \
 /tmp/api.xml \
 \$BUILD_URL/api/xml || true 

 THE_USERID=`cat /tmp/api.xml | grep -oP '(?<=).*?(?=)'`
 echo -e "\$THE_USERID \\c" > /tmp/user_id.txt                               
 """
def some_userid = readFile("/tmp/user_id.txt")
some_userid
}