simple workflow test

wf1.sh

--- Work/data_repos » renku init test-update
Initialized empty project in /home/sam/Work/data_repos/test-update
--- Work/data_repos » cd test-update
--- data_repos/test-update ‹master› » 
--- data_repos/test-update ‹master› » 
--- data_repos/test-update ‹master› » renku run echo "A" > step1
--- data_repos/test-update ‹master› » renku run cat step1 > step2
--- data_repos/test-update ‹master› » renku run cat step2 > step3
--- data_repos/test-update ‹master› » 
--- data_repos/test-update ‹master› » 
--- data_repos/test-update ‹master› » cat step*     
A
A
A
--- data_repos/test-update ‹master› » renku run echo "B" > step1
--- data_repos/test-update ‹master› » cat step*
B
A
A
--- data_repos/test-update ‹master› » renku update step3
Resolved '.renku/workflow/b294ec8ac3284a54b91ddb7218fe1e88.cwl' to 'file:///home/sam/Work/data_repos/test-update/.renku/workflow/b294ec8ac3284a54b91ddb7218fe1e88.cwl'
[workflow ] start
[workflow ] starting step step_1
[step step_1] start
[job step_1] /tmp/tmpdiu7ge1h$ cat \
    /tmp/tmpl3ht6soe/stg3be7b5a3-e160-48e4-8ff3-7fd7c11ad2e2/step2 > /tmp/tmpdiu7ge1h/step3
[job step_1] completed success
[step step_1] completed success
[workflow ] completed success
Unchanged files:

	step3
--- data_repos/test-update ‹master› » cat step*
B
A
A