Detached head in gitlab ci pipeline - how to push correctly-CodePudding

I got some problems with a detached head for my repository in a CI pipeline. In the build stage of the pipeline I am running a script, which changes a specific file. After changing this file get pushed to the repository.

before_script:
  - git config --global user.name "Bot"
  - git config --global user.email "[email protected]"
  - git status
script:
  - npx ts-node ./generate.ts
  - git push "https://git:${GIT_PUSH_TOKEN}@${CI_REPOSITORY_URL#*@}" "HEAD:main"
  - git status

Running the script give me the output

Fetching changes with git depth set to 50...
Initialized empty Git repository in /builds/fKSu5-y_/0/project/.git/
Created fresh repository.
Checking out 9b4a88be as main...

$ git status
HEAD detached at 9b4a88be

$ git push "https://git:${GIT_PUSH_TOKEN}@${CI_REPOSITORY_URL#*@}" "HEAD:main"
To https://gitlab.domain.com/project.git
9b4a88b..98be83e  HEAD -> main

$ git status
HEAD detached from 9b4a88b

I do not understand why the first git status in the before_script already gives me a detached head.

I think the pipeline creates a detached repository by initial fetching. So the question is how to handle my push in a correct way. In my release stage I'm running semantic-release which fails because of detached head if I do the previous push. If I disable the push, semantic release is working as expected. But of course I need the push. I do not see, what I am doing wrong.

Update

Adding git checkout main in the before_script give me for the first git status the expected result. But after the push command I still have the detached head - which I do not understand.

$ git checkout main
Branch 'main' set up to track remote branch 'main' from 'origin'.
Switched to a new branch 'main'

$ git status
On branch main
Your branch is up to date with 'origin/main'.

$ git push "https://git:${GIT_PUSH_TOKEN}@${CI_REPOSITORY_URL#*@}" "HEAD:main"
To https://gitlab.domain.com/project.git
  336b065..8299e43  HEAD -> main

$ git status
On branch main
Your branch is ahead of 'origin/main' by 1 commit.
  (use "git push" to publish your local commits)

Although everything the push is working on the release state semantic-release is still not working. I do get: The local branch main is behind the remote one, therefore a new version won't be published.

CodePudding user response：

I do not understand why the first git status in the before_script already gives me a detached head.

I think the pipeline creates a detached repository by initial fetching.

You are right, GitLab CI does checkout a specific commit as opposed to a certain branch. You could however add git checkout "$CI_COMMIT_REF_NAME" to your before_script:

before_script:
  - git config --global user.name "Bot"
  - git config --global user.email "[email protected]"
  - git checkout "$CI_COMMIT_REF_NAME"
  - git status