github-action-push-to-another-repository/entrypoint.sh

#!/bin/sh -l

set -e  # if a command fails it stops the execution
set -u  # script fails if trying to access to an undefined variable

echo "Starts"
SOURCE_DIRECTORY="$1"
DESTINATION_GITHUB_USERNAME="$2"
DESTINATION_REPOSITORY_NAME="$3"
USER_EMAIL="$4"
DESTINATION_REPOSITORY_USERNAME="$5"
TARGET_BRANCH="$6"
COMMIT_MESSAGE="$7"

if [ -z "$DESTINATION_REPOSITORY_USERNAME" ]
then
  DESTINATION_REPOSITORY_USERNAME="$DESTINATION_GITHUB_USERNAME"
fi

CLONE_DIR=$(mktemp -d)

echo "Cloning destination git repository"
# Setup git
git config --global user.email "$USER_EMAIL"
git config --global user.name "$DESTINATION_GITHUB_USERNAME"
git clone --single-branch --branch "$TARGET_BRANCH" "https://$API_TOKEN_GITHUB@github.com/$DESTINATION_REPOSITORY_USERNAME/$DESTINATION_REPOSITORY_NAME.git" "$CLONE_DIR"
ls -la "$CLONE_DIR"

TARGET_DIR=$(mktemp -d)
# This mv has been the easier way to be able to remove files that were there
# but not anymore. Otherwise we had to remove the files from "$CLONE_DIR",
# including "." and with the exception of ".git/"
mv "$CLONE_DIR/.git" "$TARGET_DIR"

if [ ! -d "$SOURCE_DIRECTORY" ]
then
	echo "ERROR: $SOURCE_DIRECTORY does not exist"
	echo "This directory needs to exist when push-to-another-repository is executed"
	echo
	echo "In the example it is created by ./build.sh: https://github.com/cpina/push-to-another-repository-example/blob/main/.github/workflows/ci.yml#L19"
	echo
	echo "If you want to copy a directory that exist in the source repository"
	echo "to the target repository: you need to clone the source repository"
	echo "in a previous step in the same build section. For example using"
	echo "actions/checkout@v2. See: https://github.com/cpina/push-to-another-repository-example/blob/main/.github/workflows/ci.yml#L16"
	exit 1
fi

echo "Copy contents to target git repository"
cp -ra "$SOURCE_DIRECTORY"/. "$TARGET_DIR"
cd "$TARGET_DIR"

echo "Files that will be pushed:"
ls -la

ORIGIN_COMMIT="https://github.com/$GITHUB_REPOSITORY/commit/$GITHUB_SHA"
COMMIT_MESSAGE="${COMMIT_MESSAGE/ORIGIN_COMMIT/$ORIGIN_COMMIT}"

echo "git add:"
git add .

echo "git status:"
git status

echo "git diff-index:"
# git diff-index : to avoid doing the git commit failing if there are no changes to be commit
git diff-index --quiet HEAD || git commit --message "$COMMIT_MESSAGE"

echo "git push origin:"
# --set-upstream: sets de branch when pushing to a branch that does not exist
git push origin --set-upstream "$TARGET_BRANCH"