原文：https://robots.thoughtbot.com/keeping-a-github-fork-updated
I forked a GitHub repo thoughtbot/dotfiles to croaky/dotfiles and want to keep it updated.
Track
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After I forked the repo to your Github account, I did this one time:
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git clone git@github.com:croaky/dotfiles.git
cd dotfiles
git remote add upstream git@github.com:thoughtbot/dotfiles.git
Update
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Each time I want to update, from my local master branch:
git fetch upstream
git rebase upstream/master
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The goal of the rebase is to have a cleaner history if I have local changes or commits on the repo. It’s the difference between the the left and the right in the image below.
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Commit rights upstream
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If I also have commit rights to the upstream repo, I can create a local upstream branch and do work that will go upstream there.
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git checkout -b upstream upstream/master