Update the default branch name for every repo in a user/org

user-repos-default-branch.sh

#!/bin/bash
NAME="$1"
BRANCH="${2:-main}"
HUB=$(which hub || echo /usr/local/bin/hub)

# get repos that belong to the given user/org, are not archived, and are not forks
repos=($($HUB api --paginate --obey-ratelimit --flat graphql -f query='
  query($endCursor: String) {
    repositoryOwner(login: "'"$NAME"'") {
      repositories(isLocked: false, isFork: false, first: 100, after: $endCursor) {
        nodes { nameWithOwner }
        pageInfo { hasNextPage, endCursor }
      }
    }
  }
' | grep nameWithOwner | cut -f2 | grep "$NAME/"))

count=$(echo $(echo "${repos[*]}" | wc -w))
echo "found $count repos belonging to $NAME"

for repo in ${repos[@]}; do
  echo "$repo"

  # look for a branch with the right name
  if $HUB api --flat "repos/$repo/git/refs/heads/$BRANCH" | grep ".object.sha" 1> /dev/null; then
    echo "  found branch $BRANCH"
  else
    # create the branch we need if it doesn't exist
    SHA=$($HUB api --flat "repos/$repo/git/refs/heads/master" | grep ".object.sha" | cut -f2)
    $HUB api "repos/$repo/git/refs" -F "ref=refs/heads/$BRANCH" -F "sha=$SHA" 1> /dev/null
    echo "  created branch $BRANCH"
  fi

  # now that the branch exists, update the repo default branch
  $HUB api "repos/$repo" -X PATCH -F default_branch="$BRANCH" --flat 1> /dev/null
  echo "  set default branch to $BRANCH"

  # check how close we are to the rate limit
  ratelimit=$($HUB api rate_limit --flat | grep .core)
  if [[ $(echo "$ratelimit" | grep .remaining | cut -f2) < 4 ]]; then
    # if we have less than 4 API calls left, sleep until the limit resets
    sleep $(expr $(echo "$ratelimit" | grep .reset | cut -f2) - $(date +%s))
  fi
done