action-setup

#!/usr/bin/env bash

set -euo pipefail

die() { echo "$*"; exit 1; }

# When calling this script, unless from the action at the root, you should 
# specify the name of the sub-action (i.e. its path relative to repo root).
# It defaults to "." meaning the repo root itself.
SUB_ACTION="${1:-.}"

if [[ -z "${TMPDIR:-}" ]]; then
	if [[ -z "$RUNNER_TEMP" ]]; then
		die "Neither TMPDIR nor RUNNER_TEMP are set."
	fi
	TMPDIR="$RUNNER_TEMP"
	export TMPDIR
fi

# This script exports some environment variables for later steps,
# and clones this entire repository into the action path.
#
# When actions are used, the repository itself is not present by
# default, however the repository itself is required by this action
# in order for it to build its own CLI.

#
# Clone the action repository.
#

ACTION_REPO="https://github.com/hashicorp/actions-go-build"
ACTION_PATH="${GITHUB_ACTION_PATH:?}"
ACTION_ROOT="${ACTION_PATH%"/$SUB_ACTION"}"
ACTION_REF="$(basename "$ACTION_ROOT")"

# If the ref is just "." then that means we're referencing the action
# from the self-tests rather than from a remote repo. Therefore the
# action ref is just the same as the current github.sha.
if [[ "$ACTION_REF" == "." ]]; then
	ACTION_COMMIT="$GITHUB_SHA"
	ACTION_REF="$GITHUB_REF_NAME"
	# Strip the /./ from the end of action path.
	ACTION_ROOT="${ACTION_ROOT%/./}"
fi

# Clone the repo if needed.
if [[ ! -d "$ACTION_ROOT/.git" ]]; then
	# Go to the directory containing the directory containing the action.
	cd "$ACTION_ROOT/.." || die "Unable to cd to '$ACTION_ROOT/..'"

	# Destroy the action from orbit.
	rm -rf "$ACTION_ROOT"

	if [[ -n "${GITHUB_TOKEN:-}" ]]; then
		git config --global "url.http://$GITHUB_TOKEN@github.com/.insteadOf" = https://github.com/
	fi

	if [[ "$ACTION_REF" =~ [a-f0-9]{40} ]]; then
		# It's a commit.
		ACTION_COMMIT="$ACTION_REF"
		git clone "$ACTION_REPO" "$ACTION_ROOT"
	else
		# It's a branch or tag ref.
		# Clone the action repository.
		git clone --depth 1 --branch "$ACTION_REF" "$ACTION_REPO" "$ACTION_ROOT"
	fi
fi

#
# Install the CLI
#

cd "$ACTION_ROOT" || die "Unable to cd to '$ACTION_ROOT'"

# If we set ACTION_COMMIT that's because we're running self-tests.
# Ensure we're using the same commit that was pushed in case there's
# another push to the branch since the workflow started.
if [[ -n "${ACTION_COMMIT:-}" ]]; then
	git fetch origin "$ACTION_COMMIT"
	git reset --hard "$ACTION_COMMIT"
fi

# Ensure that config defined in the usage of this action
# doesn't impact the build of the action's own CLI.
export PRODUCT_REPOSITORY="actions-go-build"
export PRODUCT_NAME="actions-go-build"
export PRODUCT_VERSION_META=
export BIN_NAME="actions-go-build"

RUN="${ACTION_ROOT:?}/scripts/gha run"

$RUN make install

#
# Export environment variables for later steps.
#

{
  echo "TMPDIR=${RUNNER_TEMP:?}"
  echo "RUN=$RUN"
  echo "RUN_CLI=env DEBUG=true ${ACTION_ROOT:?}/scripts/gha run actions-go-build"
} >> "${GITHUB_ENV:?}"