How can I get the commit diff in Gitlab CI?

Question

I use Gitlab CI for checking a code quality of my project. Sometime I want to check only new code ( new commit ).
How can I get diff from Gitlab CI ?

Rockaway

A diff from what to what, exactly? A CI pipeline need not be for a Merge Request. – Yaelyager

@JonathonReinhart It would be just commit from local:master to origin:master, I want get diff from last commit and previous – Rockaway

Answer 1

I found out solution, it was obvious, but not for me

 diff:
   script:
     - git diff ${CI_COMMIT_SHA} master
   except:
     - master

Rockaway

Can we replace master by the branch for which the MR is created? – Clemente

You can. Set "only: - merge_requests" setting for the job. Variables can be found here docs.gitlab.com/ee/ci/variables/predefined_variables.html .They start with prefix CI_MERGE_REQUEST. – Laurettelauri

Answer 2

I did something similar but for long lasting builds in a bash script with this approach

git diff --quiet $LAST_COMMIT_HASH HEAD path/of/interest1/ # optionally add more paths like file/of/interest2.txt
if [[ $? -ne 0 ]]; then
  echo rechecking code quality
  # ...
fi

$LAST_COMMIT_HASH could be HEAD~1 for simplest (stupid) use case

or you could try to read it out fron an artifacted/cached file like "last_code_check_commit_hash.txt" that you generate during your code quality check job. Sth. like

git rev-parse HEAD  > last_code_check_commit_hash.txt

Frag