odhcpd: add a simple build script

Inspired from the ci script and the scripts I've been using. Should make it a
little bit easier for people who want to contribute to odhcpd.

Signed-off-by: David Härdeman <david@hardeman.nu>
Link: https://github.com/openwrt/odhcpd/pull/280
Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>

.gitignore

@@ -11,4 +11,4 @@ Makefile
 cmake_install.cmake
 install_manifest.txt
 *.deb
-
+build

scripts/devel-build.sh

@@ -0,0 +1,104 @@
+#!/bin/bash
+
+set -euxo pipefail
+cd "${0%/*}"
+cd ..
+
+# Sanity checks
+if [ ! -e "CMakeLists.txt" ] || [ ! -e "src/odhcpd.c" ]; then
+	echo "odhcpd checkout not found" >&2
+	exit 1
+fi
+
+if [ $# -eq 0 ]; then
+	BUILD_ARGS="-DDHCPV4_SUPPORT=ON"
+else
+	BUILD_ARGS="$@"
+fi
+
+# Create build dirs
+ODHCPDDIR="$(pwd)"
+BUILDDIR="${ODHCPDDIR}/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 "libnl-tiny" ] || git clone https://github.com/openwrt/libnl-tiny.git
+[ -e "libubox" ] || git clone https://github.com/openwrt/libubox.git
+[ -e "uci" ] || git clone https://github.com/openwrt/uci.git
+[ -e "ubus" ] || git clone https://github.com/openwrt/ubus.git
+
+# Build json-c
+cd "${DEPSDIR}/json-c"
+cmake							\
+	-S .						\
+	-B .						\
+	-DCMAKE_PREFIX_PATH="${BUILDDIR}"		\
+	-DBUILD_SHARED_LIBS=OFF				\
+	-DDISABLE_EXTRA_LIBS=ON				\
+	--install-prefix "${BUILDDIR}"
+make
+make install
+
+# Build libnl-tiny
+cd "${DEPSDIR}/libnl-tiny"
+cmake							\
+	-S .						\
+	-B .						\
+	-DCMAKE_PREFIX_PATH="${BUILDDIR}"		\
+	--install-prefix "${BUILDDIR}"
+make
+make install
+
+# Build libubox
+cd "${DEPSDIR}/libubox"
+cmake							\
+	-S .						\
+	-B .						\
+	-DCMAKE_PREFIX_PATH="${BUILDDIR}"		\
+	-DBUILD_LUA=OFF					\
+	-DBUILD_EXAMPLES=OFF				\
+	--install-prefix "${BUILDDIR}"
+make
+make install
+
+# Build ubus
+cd "${DEPSDIR}/ubus"
+cmake							\
+	-S .						\
+	-B .						\
+	-DCMAKE_PREFIX_PATH="${BUILDDIR}"		\
+	-DBUILD_LUA=OFF					\
+	-DBUILD_EXAMPLES=OFF				\
+	--install-prefix "${BUILDDIR}"
+make
+make install
+
+# Build uci
+cd "${DEPSDIR}/uci"
+cmake							\
+	-S .						\
+	-B .						\
+	-DCMAKE_PREFIX_PATH="${BUILDDIR}"		\
+	-DBUILD_LUA=OFF					\
+	--install-prefix "${BUILDDIR}"
+make
+make install
+
+# Build odhcpd
+cd "${ODHCPDDIR}"
+cmake							\
+	-S .						\
+	-B "${BUILDDIR}"				\
+	-DCMAKE_PREFIX_PATH="${BUILDDIR}"		\
+	${BUILD_ARGS}
+make -C "${BUILDDIR}"
+
+set +x
+echo "✅ Success - the odhcpd binary is available at ${BUILDDIR}/odhcpd"
+echo "👷 You can rebuild odhcpd by running 'make -C build'"
+
+exit 0