#!/bin/bash
set -e

TOOLCHAINS_URL='http://autobuild.buildroot.org/toolchains/configs/toolchain-configs.csv'

main() {
    local o O opts
    local cfg dir pkg random toolchain
    local -a toolchains

    o='hc:d:p:r:'
    O='help,config-snippet:build-dir:package:,random:'
    opts="$(getopt -n "${my_name}" -o "${o}" -l "${O}" -- "${@}")"
    eval set -- "${opts}"

    random=0
    while [ ${#} -gt 0 ]; do
        case "${1}" in
        (-h|--help)
            help; exit 0
            ;;
        (-c|--config-snippet)
            cfg="${2}"; shift 2
            ;;
        (-d|--build-dir)
            dir="${2}"; shift 2
            ;;
        (-p|--package)
            pkg="${2}"; shift 2
            ;;
        (-r|--random)
            random="${2}"; shift 2
            ;;
        (--)
            shift; break
            ;;
        esac
    done
    if [ -z "${cfg}" ]; then
        printf "error: no config snippet specified\n" >&2; exit 1
    fi
    if [ -z "${dir}" ]; then
        dir="${HOME}/br-test-pkg"
    fi

    # Extract the URLs of the toolchains; drop internal toolchains
    # E.g.: http://server/path/to/name.config,arch,libc
    #  -->  http://server/path/to/name.config
    toolchains=($(curl -s "${TOOLCHAINS_URL}" \
                  |sed -r -e 's/,.*//; /internal/d;' \
                  |if [ ${random} -gt 0 ]; then \
                      sort -R |head -n ${random}
                   else
                      cat
                   fi |sort
                 )
               )

    if [ ${#toolchains[@]} -eq 0 ]; then
        printf "error: no toolchain found (networking issue?)\n" >&2; exit 1
    fi

    for toolchain in "${toolchains[@]}"; do
        build_one "${dir}" "${toolchain}" "${cfg}" "${pkg}"
    done
}

build_one() {
    local dir="${1}"
    local url="${2}"
    local cfg="${3}"
    local pkg="${4}"
    local toolchain line skip

    # Using basename(1) on a URL works nicely
    toolchain="$(basename "${url}" .config)"

    printf "%40s: " "${toolchain}"

    dir="${dir}/${toolchain}"
    mkdir -p "${dir}"

    printf "download config"
    if ! curl -s "${url}" >"${dir}/.config"; then
        printf ": FAILED\n"
        return
    fi

    cat >>"${dir}/.config" <<-_EOF_
	BR2_INIT_NONE=y
	BR2_SYSTEM_BIN_SH_NONE=y
	# BR2_PACKAGE_BUSYBOX is not set
	# BR2_TARGET_ROOTFS_TAR is not set
	_EOF_
    cat "${cfg}" >>"${dir}/.config"

    printf ", olddefconfig"
    if ! make O="${dir}" olddefconfig >/dev/null 2>&1; then
        printf ": FAILED\n"
        return
    fi
    # We want all the options from the snippet to be present as-is (set
    # or not set) in the actual .config; if one of them is not, it means
    # some dependency from the toolchain or arch is not available, in
    # which case this config is untestable and we skip it.
    skip=false
    while read line; do
        if ! grep "^${line}\$" "${dir}/.config" >/dev/null 2>&1; then
            printf "%s\n" "${line}"
            skip=true
        fi
    done <"${cfg}" >"${dir}/missing.config"
    if ${skip}; then
        printf ", SKIPPED\n"
        return
    fi
    # Remove file, it's empty anyway.
    rm -f "${dir}/missing.config"

    if [ -n "${pkg}" ]; then
        printf ", dirclean"
        if ! make O="${dir}" "${pkg}-dirclean" >> "${dir}/logfile" 2>&1; then
            printf ": FAILED\n"
            return
        fi
    fi

    printf ", build"
    # shellcheck disable=SC2086
    if ! make O="${dir}" ${pkg} >> "${dir}/logfile" 2>&1; then
        printf ": FAILED\n"
        return
    fi

    printf ": OK\n"
}

help() {
    cat <<_EOF_
test-pkg: test-build a package against various toolchains and architectures

The supplied config snippet is appended to each toolchain config, the
resulting configuration is checked to ensure it still contains all options
specified in the snippet; if any is missing, the build is skipped, on the
assumption that the package under test requires a toolchain or architecture
feature that is missing.

In case failures are noticed, you can fix the package and just re-run the
same command again; it will re-run the test where it failed. If you did
specify a package (with -p), the package build dir will be removed first.

The list of toolchains is retrieved from the Buildroot autobuilders, available
at ${TOOLCHAINS_URL}.

Options:

    -h, --help
        Print this help.

    -c CFG, --config-snippet CFG
        Use the CFG file as the source for the config snippet. This file
        should contain all the config options required to build a package.

    -d DIR, --build-dir DIR
        Do the builds in directory DIR, one sub-dir per toolchain.

    -p PKG, --package PKG
        Test-build the package PKG, by running 'make PKG'; if not specified,
        just runs 'make'.

    -r N, --random N
        Limit the tests to the N randomly selected toolchains, instead of
        building with all toolchains.

Example:

    Testing libcec would require a config snippet that contains:
        BR2_PACKAGE_LIBCEC=y

    Testing libcurl with openSSL support would require a snippet such as:
        BR2_PACKAGE_OPENSSL=y
        BR2_PACKAGE_LIBCURL=y

_EOF_
}

my_name="${0##*/}"
main "${@}"