LLVM Release Switcher

setup_release.sh

#!/usr/bin/env bash

set -e

function log {
	echo -e "\x1b[36;1m""$@""\x1b[m"
}

function log2 {
	echo -e "\x1b[36;2m""$@""\x1b[m"
}

cd "$(dirname "${0}")"

re='^[0-9]+$'
if ! [[ "$1" =~ $re ]]; then
	echo "usage: ${0} <release_number>" >&2
	echo "error: invalid release number: ${1}" >&2
	exit 2
fi

RELEASE="${1}"
RELEASE_BRANCH="release_${RELEASE}"

log "Selected release ${RELEASE} (branch '${RELEASE_BRANCH}')"

function get_release {
	if [[ ! -z "${1}" ]] && [[ ! -z "${2}" ]] && [[ ! -d "${2}" ]]; then
		log2 "cloning ${1} into ${2}"
		git clone --recursive -b "${RELEASE_BRANCH}" --depth=1 "${1}" "${2}"
		log2 'listing branches'
		git branch
		log2 'done'
		return $?
	fi

	cd "${2}"

	if git checkout -b "${RELEASE_BRANCH}" 2>/dev/null; then
		log2 'branch already created'
		git checkout "${RELEASE_BRANCH}"
	fi

	log2 'fetching release'
	git fetch --depth=1 origin "${RELEASE_BRANCH}"

	log2 'hard resetting'
	git reset --hard FETCH_HEAD

	log2 'updating submodules'
	git submodule update --init --recursive
	git submodule foreach git pull origin "${RELEASE_BRANCH}"

	log2 'listing branches'
	git branch --list --color=always | cat
	log2 'done'

	cd -
}

log 'updating base release...'
get_release

log 'updating clang...'
get_release 'https://github.com/llvm-mirror/clang.git' tools/clang

log 'updating clang extras...'
get_release 'https://github.com/llvm-mirror/clang-tools-extra.git' tools/clang/tools/extra

log 'updating compiler-rt...'
get_release 'https://github.com/llvm-mirror/compiler-rt.git' projects/compiler-rt

log 'updating libcxx...'
get_release 'https://github.com/llvm-mirror/libcxx.git' projects/libcxx

if [[ -d build ]]; then
	log 'cleaning build directory'
	rm -rf build
fi

if ! command -v ninja > /dev/null && [[ "$(uname)" == "Darwin" ]] || [[ "$(uname)" == "Linux" ]]; then
	read -p "Would you like to speed up builds by installing Ninja (optional)? " -n 1 -r
	echo
	if [[ $REPLY =~ ^[Yy]$ ]]; then
		echo -e "\x1b[32;1mThe system may ask for your password\!\x1b[m"
		(
		case "$(uname)" in
			Darwin) brew install ninja; brew link ninja ;;
			Linux) sudo apt-get install -y ninja ;;
			*) exit 1;
		esac
		) || log2 "Could not install Ninja for you; you can try doing it manually and then re-run this script."
	fi
fi

log 'initializing CMake'
mkdir -p build
if command -v ninja > /dev/null; then
	(cd build && cmake .. -GNinja -DCMAKE_BUILD_TYPE=Release -DLLVM_ENABLE_PROJECTS=lld)
else
	(cd build && cmake .. -DCMAKE_BUILD_TYPE=Release -DLLVM_ENABLE_PROJECTS=lld)
fi

log 'building...'
if command -v ninja > /dev/null; then
	(cd build && ninja)
else
	cmake --build build
fi

log 'SUCCESS'