build.subr

#!/usr/bin/env bash
#
# Shell script for building Phoenix-RTOS ports
#
# Common functions
#
# Copyright 2024 Phoenix Systems
# Author: Daniel Sawka
#

# Variables needed for the functions below
: "${PREFIX_PORT:?variable unset}"
: "${PREFIX_PORT_BUILD:?variable unset}"
: "${PORTS_MIRROR_BASEURL:?variable unset}"


# b_port_download(baseurl, filename, [orig_filename])
#  Fetch a file from ${baseurl}${filename} (or ${baseurl}${orig_filename} if provided) and save as ${filename}
#  in current port's directory. Provide ${orig_filename} if filename on the external server doesn't follow the
#  package-X.Y.Z.ext convention (e.g. it's a hash). If download fails, try again from ${PORTS_MIRROR_BASEURL}${filename}.
#
#  This function also verifies file integrity if checksums/${filename}.sha256 file exists (opt-in feature).
b_port_download() {
	local baseurl="${1:?baseurl missing}"
	local filename="${2:?filename missing}"
	local orig_filename="${3:-$filename}"

	local checksum_file="${PREFIX_PORT}/checksums/${filename}.sha256"

	if [ ! -f "${PREFIX_PORT}/${filename}" ]; then
		if ! wget "${baseurl}${orig_filename}" -O "${PREFIX_PORT}/${filename}.part" --no-check-certificate; then
			wget "${PORTS_MIRROR_BASEURL}${filename}" -O "${PREFIX_PORT}/${filename}.part" --no-check-certificate
		fi

		if [ -f "${checksum_file}" ]; then
			read -r line < "${checksum_file}" || true
			local expected_checksum="${line%% *}"

			if [ -z "${expected_checksum}" ]; then
				b_die "No checksum found in ${checksum_file}"
			fi

			local actual_checksum="$(shasum -b -a 256 "${PREFIX_PORT}/${filename}.part")"
			actual_checksum="${actual_checksum%% *}"

			if [ "${expected_checksum}" = "${actual_checksum}" ]; then
				echo "Checksum OK for \"${filename}\""
			else
				b_die "Checksum INVALID for \"${filename}\": expected \"${expected_checksum}\", got \"${actual_checksum}\""
			fi
		fi

		mv -f "${PREFIX_PORT}/${filename}.part" "${PREFIX_PORT}/${filename}"
	fi
}

# b_port_apply_patches(srcdir, [patch_subdir])
#  Apply patches to files in ${srcdir}. Non-recursive - use multiple calls with
#  ${patch_subdir} if you group patches into separate directories.
b_port_apply_patches() {
	local srcdir="${1:?srcdir missing}"
	local patch_subdir="${2:-.}"

	local patch_dir="${PREFIX_PORT}/patches/${patch_subdir}"
	local marker_dir="${PREFIX_PORT_BUILD}/markers/${patch_subdir}"
	if [ -d "${patch_dir}" ]; then
		mkdir -p "${marker_dir}"
	fi

	# Restores the initial value of nullglob option upon function return
	trap "$(shopt -p nullglob)" RETURN
	shopt -s nullglob

	for patchfile in "${patch_dir}"/*.patch; do
		if [ ! -f "${marker_dir}/$(basename "${patchfile}").applied" ]; then
			echo "applying patch: ${patchfile}"
			patch -d "${srcdir}" -p1 < "${patchfile}"
			touch "${marker_dir}/$(basename "${patchfile}").applied"
		fi
	done
}

export -f b_port_download b_port_apply_patches