build-live-iso

#!/bin/bash

. "$(dirname $(realpath "${0}"))/functions.sh"
. "$(dirname $(realpath "${0}"))/functions.bash"
cd_repo_root

# let failures in pipe fail the whole pipe
set -o pipefail

# turn on extended globbing for !(pattern-list)
shopt -s extglob

case "${1}" in
    # debug mode
    "-D")
        ;&
    "--debug")
        shift; set -x; trap "set +x" EXIT SIGHUP SIGQUIT SIGTERM
        ;;
    # give some rudimentary help if requested
    "-h")
        ;&
    "--help")
        print_info "usage is [--debug] ${0} [BUILD_VARIANT]"
        print_info "If given, BUILD_VARIANT must match a sub-folder or symlink in variants.build/"
        exit
        ;;
esac

select_build_variant() {
    OPTIONS=()
    for VARIANT in $(command ls -Ltd variants.build/!(active|base_*|shared)/)
    do
        NUMFILES=$(find "${VARIANT}" -type f -printf x | wc -c)
        # THANKS https://stackoverflow.com/questions/4561895/how-to-recursively-find-the-latest-modified-file-in-a-directory
        NEWESTFILE=$(find ${VARIANT} -type f -printf '%T@ %p\n'|sort -n|tail -n 1|cut -d" " -f2-)
        [ -z "${NEWESTFILE}" ] && CHANGESTR="" || CHANGESTR=", last changed $(rel_fmt_low_precision $(stat --format='@%Y' "${NEWESTFILE}"))"
        OPTIONS+=(${VARIANT#variants.build/} "(${NUMFILES} files${CHANGESTR})")
    done
    TEXT="Please choose the variant to build. (Build Variants named base_* or shared are not listed)"
    TITLE="SELECT LIVE SYSTEM BUILD VARIANT"
    display_menu "${TITLE}" "${TEXT}" "${OPTIONS[@]}"
}

print_time_used() {
    print_info "this took $(format_timespan $(($(date +%s) - STARTTIME))) (+ the work of many)" 2> >(tee --append "${LOGFILE}")
}

build_main() {
    # if a BUILD_VARIANT is given as parameter, prefer that
    [ -n "${1}" ] && BUILD_VARIANT=${1}

    # if not given, query user to visually select a variant
    [ -n "${BUILD_VARIANT}" ] || BUILD_VARIANT=$(select_build_variant)

    [ -z "${BUILD_VARIANT}" ] && die "no BUILD_VARIANT selected. #saaad.."

    # chop off possible trailing slash and expose variable to sub processes
    export BUILD_VARIANT=${BUILD_VARIANT%/}

    # ensure the directory exists
    [ -d "variants.build/${BUILD_VARIANT}" ] || die "given BUILD_VARIANT=${BUILD_VARIANT} does not exist"

    print_info "Live-Stick Build Variant chosen: ${BUILD_VARIANT}\n"

    print_info "Available live-build versions:"
    apt policy live-build
    [ -n "${LIVE_BUILD}" ] && print_warn "LIVE_BUILD variable is set\nlive-build scripts and functions will be invoked from ${LIVE_BUILD}"
    print_info "Using live-build $(lb --version), lb command is $(type lb)"

    # build in an appropriate sub-folder
    cd build

    # clean up live-build environment using auto/clean script
    print_info "Triggering build area clean-up.."
    lb clean --color

    # generate live-build config/ from features of specified variant
    print_info "Collecting build features for ${BUILD_VARIANT}.."
    transmogrify_features ../variants.build/${BUILD_VARIANT}

    # have live-build complete its config
    print_info "Let live-build finalize its configuration"
    lb config --color

    # Trigger image build
    print_info "Firing build process, fasten seatbelts.. it is $(date '+%F %H:%M') now."
    lb build --color &&
    {
        print_success "Building ISO SUCCEEDED"

        # Ensure artifacts dir exists
        mkdir -p ../artifacts

        # and move generated files there
        LB_IMAGE_NAME=$(get_image_name)
        mv -iv ${LB_IMAGE_NAME}*.* ../artifacts/
    } || die "lb build FAILED for ${BUILD_VARIANT}, check ${LOGFILE}"
}

is_root_user_or_die

LOGFILE="build/build-live-iso.$(date '+%F.%H%Mh').log"

# Measure time and print when exiting
STARTTIME=$(date +%s)
trap "print_time_used" EXIT SIGHUP SIGQUIT SIGTERM

# Filter build log from apt's complaints about outdated packages in cache
build_main "${@}" |& tee >(sed '/^Del /d' > "${LOGFILE}")