entrypoint.sh

#!/usr/bin/env bash

set -e
set -o pipefail

if [[ -z "$GITHUB_TOKEN" ]]; then
  echo "Set the GITHUB_TOKEN environment variable."
  exit 1
fi

if [[ ! -z "$INPUT_SOURCE_BRANCH" ]]; then
  SOURCE_BRANCH="$INPUT_SOURCE_BRANCH"
elif [[ ! -z "$GITHUB_REF" ]]; then
  SOURCE_BRANCH=${GITHUB_REF/refs\/heads\//}  # Remove branch prefix
else
  echo "Set the INPUT_SOURCE_BRANCH environment variable or trigger from a branch."
  exit 1
fi

DESTINATION_BRANCH="${INPUT_DESTINATION_BRANCH:-"master"}"

# Determine repository url
if [[ -z "$INPUT_DESTINATION_REPOSITORY" ]]; then
  # Try to query local repository's remote url if INPUT_DESTINATION_REPOSITORY is null
  local_origin=$(git config --get remote.origin.url)

  if [[ "$local_origin" == *.git ]]; then
    origin_no_suffix="${local_origin%.*}"
  else
    origin_no_suffix="$local_origin"
  fi

  repo="$(basename "${origin_no_suffix}")"
  owner="$(basename "${origin_no_suffix%/${repo}}")"

  if [[ ! -z "$repo" ]]; then
    CHECKOUT_REPOSITORY="$owner/$repo"
  fi
fi

# Fallback to GITHUB_REPOSITORY if both INPUT_DESTINATION_REPOSITORY and CHECKOUT_REPOSITORY are unavailable
DESTINATION_REPOSITORY="${INPUT_DESTINATION_REPOSITORY:-${CHECKOUT_REPOSITORY:-${GITHUB_REPOSITORY}}}"

git remote set-url origin "https://$GITHUB_ACTOR:$GITHUB_TOKEN@${GITHUB_SERVER_URL#https://}/$DESTINATION_REPOSITORY"

# Pull all branches references down locally so subsequent commands can see them
git fetch origin '+refs/heads/*:refs/heads/*' --update-head-ok

# Print out all branches
git --no-pager branch -a -vv

if [ "$(git rev-parse --revs-only "$SOURCE_BRANCH")" = "$(git rev-parse --revs-only "$DESTINATION_BRANCH")" ]; then
  echo "Source and destination branches are the same."
  exit 0
fi

# Do not proceed if there are no file differences, this avoids PRs with just a merge commit and no content
LINES_CHANGED=$(git diff --name-only "$DESTINATION_BRANCH" "$SOURCE_BRANCH" -- | wc -l | awk '{print $1}')
if [[ "$LINES_CHANGED" = "0" ]] && [[ ! "$INPUT_PR_ALLOW_EMPTY" ==  "true" ]]; then
  echo "No file changes detected between source and destination branches."
  exit 0
fi


# Workaround for `hub` auth error https://github.com/github/hub/issues/2149#issuecomment-513214342
export GITHUB_USER="$GITHUB_ACTOR"

PR_ARG="$INPUT_PR_TITLE"
if [[ ! -z "$PR_ARG" ]]; then
  PR_ARG="-m \"$PR_ARG\""

  if [[ ! -z "$INPUT_PR_TEMPLATE" ]]; then
    sed -i 's/`/\\`/g; s/\$/\\\$/g' "$INPUT_PR_TEMPLATE"
    PR_ARG="$PR_ARG -m \"$(echo -e "$(cat "$INPUT_PR_TEMPLATE")")\""
  elif [[ ! -z "$INPUT_PR_BODY" ]]; then
    PR_ARG="$PR_ARG -m \"$INPUT_PR_BODY\""
  fi
fi

if [[ ! -z "$INPUT_PR_REVIEWER" ]]; then
  PR_ARG="$PR_ARG -r \"$INPUT_PR_REVIEWER\""
fi

if [[ ! -z "$INPUT_PR_ASSIGNEE" ]]; then
  PR_ARG="$PR_ARG -a \"$INPUT_PR_ASSIGNEE\""
fi

if [[ ! -z "$INPUT_PR_LABEL" ]]; then
  PR_ARG="$PR_ARG -l \"$INPUT_PR_LABEL\""
fi

if [[ ! -z "$INPUT_PR_MILESTONE" ]]; then
  PR_ARG="$PR_ARG -M \"$INPUT_PR_MILESTONE\""
fi

if [[ "$INPUT_PR_DRAFT" ==  "true" ]]; then
  PR_ARG="$PR_ARG -d"
fi

COMMAND="hub pull-request \
  -b $DESTINATION_BRANCH \
  -h $SOURCE_BRANCH \
  --no-edit \
  $PR_ARG \
  || true"

echo "$COMMAND"

PR_URL=$(sh -c "$COMMAND")
if [[ "$?" != "0" ]]; then
  exit 1
fi

echo ${PR_URL}
echo "::set-output name=pr_url::${PR_URL}"
echo "::set-output name=pr_number::${PR_URL##*/}"
if [[ "$LINES_CHANGED" = "0" ]]; then
  echo "::set-output name=has_changed_files::false"
else
  echo "::set-output name=has_changed_files::true"
fi