Add build script for Saigo SDK (host-mode deps)

Add external_deps/sdk-build.sh which can be used as an alternative to
auto-downloading Saigo. Like external_deps/build.sh, it builds the
dependency package and installs it to the expected location. It is a
thin wrapper around the saigo-nacl-sdk CMake build; if you need more
control it is better to use CMake directly.

Author: slipher

.gitignore

@@ -40,6 +40,7 @@ build
 #ignore external deps
 external_deps/*
 !external_deps/build.sh
+!external_deps/sdk-build.sh
 !external_deps/cygtar.py
 !external_deps/*.patch
 

CMakeLists.txt

@@ -200,7 +200,7 @@ endif()
 
 # Dependencies versions
 set(DEPS_VERSION 11) # This must match the number in external_deps/build.sh
-set(SAIGOSDK_VERSION 20261030)
+set(SAIGOSDK_VERSION 20261030) # This must match the number in external_deps/sdk-build.sh
 
 option(USE_EXTERNAL_DEPS "Download or reuse dependencies from EXTERNAL_DEPS_DIR (mandatory for building and running NaCl .nexe binaries)." ON)
 

cmake/DaemonDependenciesDownload.cmake

@@ -34,6 +34,8 @@ set(SAIGOSDK_BASENAME "saigosdk-${DEPS_SYSTEM}-${DEPS_ARCH}_${SAIGOSDK_VERSION}"
 set(SAIGOSDK_PREFIX "${EXTERNAL_DEPS_DIR}/${SAIGOSDK_BASENAME}" CACHE PATH "PNaCl SDK path")
 mark_as_advanced(SAIGOSDK_PREFIX)
 
+# As an alternative to downloading, external_deps/sdk-build.sh can be used, to build the host-mode
+# dependencies and install them in the expected path.
 function(download_saigosdk)
     if (NOT EXISTS "${SAIGOSDK_PREFIX}")
         set(DEPS_FILENAME "${SAIGOSDK_BASENAME}.tar.xz")

external_deps/sdk-build.sh

@@ -0,0 +1,90 @@
+#!/usr/bin/env bash
+
+# Exit on undefined variable and error.
+set -u -e -o pipefail
+
+SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" >/dev/null 2>&1 && pwd)"
+WORK_DIR="${PWD}"
+DOWNLOAD_DIR="${WORK_DIR}/download_cache"
+
+# This should match the SAIGOSDK_VERSION in CMakeLists.txt.
+# This is mostly to ensure the path the files end up at if you build deps yourself
+# are the same as the ones when extracting from the downloaded packages.
+SAIGOSDK_VERSION=20261030
+# Can be a tag like v${SAIGOSDK_VERSION}, or a full commit hash
+SAIGOSDK_REF="v${SAIGOSDK_VERSION}"
+
+REPO_BASENAME=saigo-nacl-sdk
+REPO_URL="https://github.com/DaemonEngine/${REPO_BASENAME}"
+ARCHIVE_PATH="${DOWNLOAD_DIR}/saigosdk-${SAIGOSDK_REF}.tar.gz"
+
+usage() {
+	cat <<-EOF
+	Usage: $0 <os>-<arch> (build | install | package | wipe)...
+	<os>-<arch> should normally be your current native platform.
+	For a list of supported platforms see ${REPO_URL}/tree/master/tools/release/conf
+	Actions:
+	  build - build all tools and libraries in the SDK
+	  install - install final build products to ${WORK_DIR}/saigosdk-<os>-<arch>_${SAIGOSDK_VERSION}/
+	  wipe - delete build products (except download cache) AND install directory
+	If you want to build only a subset of packages, prefer using the
+	${REPO_URL} CMake build directly.
+	Some global configuration options are available via environment
+	variables; see ${REPO_URL}/tree/master/tools/release/build
+	EOF
+}
+
+download() {
+	test -f "${ARCHIVE_PATH}" && return
+	mkdir -p "${DOWNLOAD_DIR}"
+	curl --fail -L "${DOWNLOAD_URL}" -o "${ARCHIVE_PATH}"
+}
+
+if [ "$#" -lt 2 ]
+then
+	usage
+	exit 1
+fi
+
+PLATFORM="$1"
+shift
+
+if grep -q -E '^[0-9a-f]{40}$' <<< "${SAIGOSDK_REF}"
+then
+	DOWNLOAD_URL="https://github.com/DaemonEngine/saigo-nacl-sdk/archive/${SAIGOSDK_REF}.tar.gz"
+	TARBALL_OUTER_DIR="${REPO_BASENAME}-${SAIGOSDK_REF}"
+elif grep -q -E '^v[0-9]' <<< "${SAIGOSDK_REF}"
+then
+	# The 'v' from the tag name is mysteriously removed???
+	TARBALL_OUTER_DIR="${REPO_BASENAME}-${SAIGOSDK_REF:1}"
+	DOWNLOAD_URL="https://github.com/DaemonEngine/saigo-nacl-sdk/archive/refs/tags/${SAIGOSDK_REF}.tar.gz"
+fi
+
+INSTALL_DIR="${WORK_DIR}/saigosdk-${PLATFORM}_${SAIGOSDK_VERSION}"
+BUILD_DIR="${WORK_DIR}/build-saigosdk_${SAIGOSDK_VERSION}"
+REPO_DIR="${BUILD_DIR}/${TARBALL_OUTER_DIR}"
+
+for target in "$@"
+do
+	case "${target}" in
+	build)
+		download
+		mkdir -p "${BUILD_DIR}"
+		tar xzf "${ARCHIVE_PATH}" -C "${BUILD_DIR}"
+		(
+			cd "${REPO_DIR}"
+			tools/release/build "${PLATFORM}"
+		)
+		;;
+	install)
+		cp -R "${REPO_DIR}/build/${PLATFORM}/install/." "${INSTALL_DIR}/"
+		;;
+	wipe)
+		rm -rf "${BUILD_DIR}" "${INSTALL_DIR}"
+		;;
+	*)
+		usage
+		exit 1
+		;;
+	esac
+done