hint: Updates were rejected because the tip of your current branch is behind

はじめに

git pushすると以下のようなエラーが出てrejectされることがある

$ git push origin BranchName
error: failed to push some refs to 'xxxx'
hint: Updates were rejected because the tip of your current branch is behind
hint: its remote counterpart. Integrate the remote changes (e.g.
hint: 'git pull ...') before pushing again.
hint: See the 'Note about fast-forwards' in 'git push --help' for details.
$

原因

local branchが古い

対処

local branchを最新にする必要がある

$ git pull origin BranchName
From xxxx
 * branch            xxxx -> FETCH_HEAD
Auto-merging xxxx
Merge made by the 'recursive' strategy.
 xxxx | 1 +
 1 file changed, 1 insertion(+)
$