Howto keep Git repo with pull requests in sync with upstream

HOWTO.git-sync-with-upstream.adoc

Rebasing

Init Upstream

# Add secondary remote "upstream" for original repository
git remote add upstream https://github.com/exercism/kotlin

Following Upstream

# Reset position to master branch and fetch all changes from upstream/master
git checkout master
git fetch --all

# Incorporate upstream/master to local master and push it to our repository
git rebase upstream/master
git push

Custom Branch

git checkout -b foo

# only once
git push --set-upstream origin armstrong-numbers
# afterwards
git push

# Make pull-request via Browser

# Delete branch origin/foo via Browser

# Delete the origin/foo branch in the local repositoriy, too
git fetch --prune

# Delete the local branch, too
git branch -D foo