Temporary workspace is not clear

[cdupont]

Hello,
the documentation states: "By default, Jenkinsfile Runner will use the directory containing the Jenkinsfile as the workspace for builds".

But I see that Jenkinsfile Runner instead creates a temporary workspace:

$ jenkinsfile-runner -p /var/lib/jenkins/plugins/ -w /home/cdupont/.jenkinsfile-runner/war/2.303.3
WARNING: An illegal reflective access operation has occurred                                                                                                                                              
WARNING: Illegal reflective access by com.google.inject.internal.cglib.core.$ReflectUtils$2 (file:/home/cdupont/.jenkinsfile-runner/war/2.303.3/WEB-INF/lib/guice-4.0.jar) to method java.lang.ClassLoader defineClass(java.lang.String,byte[],int,int,java.security.ProtectionDomain)                                                                                                                              
WARNING: Please consider reporting this to the maintainers of com.google.inject.internal.cglib.core.$ReflectUtils$2                                                                                       
WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations                                                                                                     
WARNING: All illegal access operations will be denied in a future release                                                                                                                                 
Started                                                                                                                                                                                                   
Resume disabled by user, switching to high-performance, low-durability mode.                                                                                                                              
[Pipeline] Start of Pipeline                                                                                                                                                                              
[Pipeline] node                                                                                                                                                                                           
Running on Jenkins in /tmp/jenkinsfileRunner.tmp/jfr17689419855432207278.run/workspace/job                                                                                                                
[Pipeline] {                                                                                         
[Pipeline] stage                                                                                     
[Pipeline] { (Declarative: Checkout SCM)                                                             
[Pipeline] checkout                               
[Pipeline] }                                      
[Pipeline] // stage                               
[Pipeline] stage                                  
[Pipeline] { (Prepare)                            
[Pipeline] dir                                    
Running in /tmp/jenkinsfileRunner.tmp/jfr17689419855432207278.run/workspace/job/Staging                                                                                                                   
...

So it's not clear.
I also see a step "Declarative: Checkout SCM". What does this stage do? How can it do any checkout, since I didn't provide a SCM yaml file?

[oleg-nenashev]

All fair points. To be addressed n the documentation