How to fix fatal: The current branch feature has no upstream branch. To push the current branch and set the remote as upstream, use git push --set-upstream origin feature in Git

The simplest fix is to push while setting the upstream at the same time:

git push -u origin <branch-name>

Or using the long form:

git push --set-upstream origin <branch-name>

The -u (or --set-upstream) flag tells Git to:
1. Push the branch to the remote
2. Set up the tracking relationship

From this point forward, you can use just git push and git pull without arguments.

Tip: Use HEAD to avoid typing the branch name:

git push -u origin HEAD

This pushes the current branch to a branch of the same name on the remote.

If the remote branch already exists (perhaps created by someone else), you can set the tracking relationship without pushing:

git branch --set-upstream-to=origin/<branch-name>

Or the shorter form:

git branch -u origin/<branch-name>

This is useful when:
- The remote branch exists but your local branch isn't tracking it
- You want to change which remote branch your local branch tracks

If you want Git to automatically set up tracking whenever you push a new branch, configure push.autoSetupRemote (available in Git 2.37+):

git config --global push.autoSetupRemote true

With this setting, running git push on a branch with no upstream will automatically create the remote branch and set up tracking.

Alternative: Set push.default to current:

git config --global push.default current

This makes git push push to a branch of the same name on the remote, but note it doesn't set up tracking like push.autoSetupRemote does.

After setting the upstream, verify it's configured correctly:

git branch -vv

This shows all local branches with their upstream branch in brackets:

* feature  abc1234 [origin/feature] Your commit message
  main     def5678 [origin/main] Another commit

You can also check with:

git status

Which should now show:

On branch feature
Your branch is up to date with 'origin/feature'.