Fast-forward

fast-forward merge

git config pull.ff only  

Your branch is behind 'origin/main' by 20 commits, and can be fast-forwarded.
  (use "git pull" to update your local branch)

Errors

git push origin HEAD:you_remote_branch_name
To bitbucket.org:your_org/you_repo.git
 ! [rejected]        HEAD -> you_remote_branch_name (non-fast-forward)
error: failed to push some refs to 'bitbucket.org:your_org/your_repo.git' 
hint: Updates were rejected because a pushed branch tip is behind its remote
hint: counterpart. Check out this branch and integrate the remote changes
hint: (e.g. 'git pull ...') before pushing again.
hint: See the 'Note about fast-forwards' in 'git push --help' for details.
➜  your_repo git:(95bace6)

git push xxx your-branch
To https://github.com/your-user/your-repo.git
 ! [rejected]        your-branch -> your-branch (non-fast-forward)
error: failed to push some refs to 'https://github.com/your-user/your-repo.git'
hint: Updates were rejected because a pushed branch tip is behind its remote
hint: counterpart. Check out this branch and integrate the remote changes
hint: (e.g. 'git pull ...') before pushing again.
hint: See the 'Note about fast-forwards' in 'git push --help' for details.

Related

• --ff-only
• git push -f

See also

• Fast-forward
• git config, .git/config, .gitconfig, --list, --global, Usage: git config, credential.helper
• git pull [ -v | -a ] git request-pull, git pull origin master Pull Request (PR), --no-rebase, --rebase