ubus: add a simple build script

Should make it a little bit easier for people who want to contribute to
ubus.

Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>

.gitignore

@@ -5,6 +5,7 @@ CMakeFiles
 *.a
 *.so
 *.dylib
+build
 examples/server
 examples/client
 ubusd

scripts/devel-build.sh

@@ -0,0 +1,83 @@
+#!/bin/bash
+
+set -euxo pipefail
+cd "${0%/*}"
+cd ..
+
+# Sanity checks
+if [ ! -e "CMakeLists.txt" ] || [ ! -e "libubus.c" ]; then
+	echo "ubus checkout not found" >&2
+	exit 1
+fi
+
+if [ $# -eq 0 ]; then
+	BUILD_ARGS="-DBUILD_LUA=ON -DUNIT_TESTING=ON"
+else
+	BUILD_ARGS="$@"
+fi
+
+# Create build dirs
+UBUSDIR="$(pwd)"
+BUILDDIR="${UBUSDIR}/build"
+DEPSDIR="${BUILDDIR}/depends"
+[ -e "${BUILDDIR}" ] || mkdir "${BUILDDIR}"
+[ -e "${DEPSDIR}" ] || mkdir "${DEPSDIR}"
+
+# Download deps
+cd "${DEPSDIR}"
+[ -e "json-c" ] || git clone https://github.com/json-c/json-c.git
+[ -e "libubox" ] || git clone https://github.com/openwrt/libubox.git
+if [ ! -e "lua" ]; then
+	mkdir -p lua
+	wget -qO- https://www.lua.org/ftp/lua-5.1.5.tar.gz | \
+		tar zxvf - -C lua --strip-components=1
+	sed -i '/#define LUA_USE_READLINE/d' ./lua/src/luaconf.h
+	sed -i 's/ -lreadline -lhistory -lncurses//g' ./lua/src/Makefile
+fi
+
+# Build lua
+cd "${DEPSDIR}/lua"
+make linux install \
+	INSTALL_TOP="${BUILDDIR}"
+
+# Build json-c
+cd "${DEPSDIR}/json-c"
+cmake							\
+	-S .						\
+	-B .						\
+	-DCMAKE_PREFIX_PATH="${BUILDDIR}"		\
+	-DBUILD_SHARED_LIBS=OFF				\
+	-DDISABLE_EXTRA_LIBS=ON				\
+	-DBUILD_TESTING=OFF				\
+	--install-prefix "${BUILDDIR}"
+make
+make install
+
+# Build libubox
+cd "${DEPSDIR}/libubox"
+cmake							\
+	-S .						\
+	-B .						\
+	-DCMAKE_PREFIX_PATH="${BUILDDIR}"		\
+	-DBUILD_LUA=ON					\
+	-DBUILD_EXAMPLES=OFF				\
+	-DLUAPATH=${BUILDDIR}/lib/lua			\
+	--install-prefix "${BUILDDIR}"
+make
+make install
+
+# Build ubus
+cd "${UBUSDIR}"
+cmake							\
+	-S .						\
+	-B "${BUILDDIR}"				\
+	-DCMAKE_PREFIX_PATH="${BUILDDIR}"		\
+	-DLUAPATH=${BUILDDIR}/lib/lua			\
+	${BUILD_ARGS}
+make -C "${BUILDDIR}" all test CTEST_OUTPUT_ON_FAILURE=1
+
+set +x
+echo "✅ Success - the ubus library is available at ${BUILDDIR}"
+echo "👷 You can rebuild ubus by running 'make -C build'"
+
+exit 0