repo sync 之后没有关联分支，显示 no branch

原因

repo 就是这么设计的
repo start <branch_name> --all

解决方案

repo sync
repo forall -pc 'git checkout --track $REPO_REMOTE/$REPO_RREV'

参考链接

• https://groups.google.com/g/repo-discuss/c/q6gzEE-crgI
• https://stackoverflow.com/questions/26412062/repo-init-b-branch-repo-status-does-not-show-youre-on-a-branch