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

@@ -197,7 +197,7 @@ endif()
 
 # Dependencies versions
 set(DEPS_VERSION 11) # This must match the number in external_deps/build.sh
-set(SAIGOSDK_VERSION 20260925)
+set(SAIGOSDK_VERSION 20260925) # 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

@@ -30,6 +30,8 @@ set(SAIGOSDK_BASENAME saigosdk-${DEPS_SYSTEM}-${DEPS_ARCH}_${SAIGOSDK_VERSION})
 set(SAIGOSDK_ROOT ${EXTERNAL_DEPS_DIR}/${SAIGOSDK_BASENAME})
 set(SAIGOSDK_ROOT "${SAIGOSDK_ROOT}" PARENT_SCOPE)
 
+# 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 ${SAIGOSDK_ROOT})
         set(DEPS_FILENAME "${SAIGOSDK_BASENAME}.tar.xz")

external_deps/sdk-build.sh

@@ -0,0 +1,84 @@
+#!/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="${WORK_DIR}/download_cache"
+
+# This should match the SAIGOSDK_VERSION in CMakeLists.txt.
+# This is mostly to ensure the path the files end up at if you build deps yourself
+# are the same as the ones when extracting from the downloaded packages.
+SAIGOSDK_VERSION=20260925
+# Can be a tag like v${SAIGOSDK_VERSION}, or a full commit hash
+SAIGOSDK_REF=cbd46205f43ed956382f6bcd88e51ccd9aeb12ee
+
+REPO_BASENAME=saigo-nacl-sdk
+REPO_URL="https://github.com/DaemonEngine/${REPO_BASENAME}"
+ARCHIVE_PATH="${DOWNLOAD_DIR}/saigosdk-${SAIGOSDK_REF}.tar.gz"
+
+usage() {
+    echo "Usage: $0 <os>-<arch> (build | install | package | wipe)..."
+    echo "<os>-<arch> should normally be your current native platform."
+    echo "For a list of supported platforms see ${REPO_URL}/tree/master/tools/release/conf"
+    echo "Actions:"
+    echo "  build - build all tools and libraries in the SDK"
+    echo "  install - install final build products to ${WORK_DIR}/saigosdk-<os>-<arch>_${SAIGOSDK_VERSION}/"
+    echo "  wipe - delete build products (except download cache) AND install directory"
+    echo "If you want to build only a subset of packages, prefer using the"
+    echo "${REPO_URL} CMake build directly."
+    echo "Some global configuration options are available via environment"
+    echo "variables; see ${REPO_URL}/tree/master/tools/release/build"
+}
+
+download() {
+    test -f "${ARCHIVE_PATH}" && return
+    mkdir -p "${DOWNLOAD_DIR}"
+    if grep -q -E '^[0-9a-f]{40}$' <<< "${SAIGOSDK_REF}"
+    then
+        DOWNLOAD_URL="https://github.com/DaemonEngine/saigo-nacl-sdk/archive/${SAIGOSDK_REF}.tar.gz"
+    elif grep -q -E '^v[0-9]' <<< "${SAIGOSDK_REF}"
+    then
+        DOWNLOAD_URL="https://github.com/DaemonEngine/saigo-nacl-sdk/archive/refs/tags/${SAIGOSDK_REF}.tar.gz"
+    fi
+    curl --fail -L "${DOWNLOAD_URL}" -o "${ARCHIVE_PATH}"
+}
+
+if [ "$#" -lt 2 ]
+then
+    usage
+    exit 1
+fi
+
+PLATFORM="$1"
+shift
+
+INSTALL_DIR="${WORK_DIR}/saigosdk-${PLATFORM}_${SAIGOSDK_VERSION}"
+BUILD_DIR="${WORK_DIR}/build-saigosdk_${SAIGOSDK_VERSION}"
+REPO_DIR="${BUILD_DIR}/${REPO_BASENAME}-${SAIGOSDK_REF}" # stupid wrapping directory in the tarball...
+
+for target in "$@"
+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