path: root/functions

msg () { [ "${QUIET}" = "n" ] && echo $@; }
err () { echo "ERROR: $@" >&2; }
die () { echo "FATAL: $@" >&2; cleanup; exit 1; }

get_dirname ()
{
    # strip any trailing slash first...
    local dir="${1%/}"
    # then get the directory portion
    echo "${dir%/*}"
}

get_basename ()
{
    echo "${1##*/}"
}

get_module_name ()
{
    #cleanup - remove .ko, replace - with _
    local modname="${1%.gz}"
    modname=$(get_basename "${modname%.ko}")
    modname="${modname//-/_}"
    echo "$modname"
}

##
#  usage : in_array( $needle, $haystack )
# return : 0 - found
#          1 - not found
##
in_array() {
    local needle=$1; shift
    [[ -z $1 ]] && return 1 # Not Found
    local item
    for item in "$@"; do
        [[ $item = $needle ]] && return 0 # Found
    done
    return 1 # Not Found
}

kmodinfo() {
    modinfo -b "$BASEDIR" -k "$KERNELVERSION" "$@" 2>/dev/null
}

auto_modules ()
{
    IFS=$'\n' read -rd '' -a mods < \
        <(find /sys/devices -name modalias -exec sort -zu {} + |
        xargs -0 modprobe -aRS "$KERNELVERSION" |
        sort -u)

    printf "%s\n" "${mods[@]//-/_}"
    (( ${#mods[*]} ))
}

all_modules ()
{
    local -i count=0
    while read -r -d '' mod; do
        (( ++count ))
        mod=${mod##*/}
        mod="${mod%.ko*}"
        printf '%s\n' "${mod//-/_}"
    done < <(find "$MODULEDIR" -name '*.ko*' -print0 2>/dev/null | grep -Zz "$@")

    (( count ))
}

checked_modules ()
{
    if [[ -s "$MODULE_FILE" ]]; then
        grep -xFf "$MODULE_FILE" <(all_modules "$@")
        return 1
    else
        all_modules "$@"
    fi
}

add_full_dir ()
{
    if [ -n "${1}" -a -d "${1}" ]; then
        for f in ${1}/*; do
            if [ -d "${f}" ]; then
                add_full_dir "${f}"
            else
                add_file "${f}"
            fi
        done
    fi
}

add_dir ()
{
    #skip root directory and "." for relative directories... i.e. /foo/bar/./blah
    if [ -n "${1}" -a "${1}" != "/" -a "${1}" != "." ]; then
        if ! grep -q "dir ${1} " "${FILELIST}"; then
            add_dir $(get_dirname "${1}")
            msg "  adding  dir ${1}"
            echo "dir ${1} 755 0 0" >> "${FILELIST}"
        fi
    fi
}

# what the hell does this do?
add_symlink ()
{
    local fil dest dir
    if [ -h ${1} ]; then
        fil="${1##$BASEDIR}"
        dest="${2##$BASEDIR}"
        add_dir $(get_dirname "${dest}")
        add_dir $(get_dirname "${fil}")
        if ! grep -q "slink ${fil} " "${FILELIST}"; then
            msg "  adding link ${fil} -> ${dest}"
            echo "slink ${fil} ${dest} $(stat -c '%a' ${1}) 0 0" >> "${FILELIST}"
        fi
    fi
    #fail quietly
}

add_file ()
{
    local fil lnk dir dest
    if [ -f "${1}" ]; then
        fil="${1}"
        lnk=$(readlink -f "${fil}")
        if [ -n "${lnk}" ]; then
            add_symlink "${fil}" "${lnk}"
            fil="${lnk}"
        fi
        if [[ $2 ]]; then
            dest="${2}"
        else
            dest="${fil##$BASEDIR}"
            if [ "${dest}" = "${dest#/}" ]; then
                dest="/${dest}"
            fi
        fi

        add_dir $(get_dirname "${dest}")

        if ! grep -q "file ${dest} " "${FILELIST}"; then
            msg "  adding file ${dest}"
            echo "file ${dest} ${fil} $(stat -c '%a' ${fil}) 0 0" >> "${FILELIST}"
        fi
    else
        err "file '${1}' does not exist"
        return 1
    fi
}

declare -a ADDED_MODULES
#modules are handled specially in order to enable autodetection
add_module ()
{
    local module path fw dep deps
    module=${1%.ko*}

    #skip expensive stuff if this module has already been added
    if in_array $module ${ADDED_MODULES[@]}; then
        msg "module $module was already added"
        return
    fi

    path=$(kmodinfo -0F filename "$module")
    if [[ $path ]]; then
        # get module firmware
        while read -r -d '' fw; do
            if [[ -e "$BASEDIR/lib/firmware/$fw" ]]; then
                add_file "$BASEDIR/lib/firmware/$fw"
            fi
        done < <(kmodinfo -0F firmware "$module")

        # get module depends
        IFS=',' read -r -d '' -a deps < <(kmodinfo -0F depends "$module")
        for dep in "${deps[@]}"; do
            add_module "$dep"
        done

        ADDED_MODULES+=("$module")
        msg "  adding module $module"
        add_file "$path" || return
    else
        err "module '$module' not found"
        return
    fi

    # explicit module depends
    case "$module" in
        fat) add_module "nls_cp437" ;;
        ocfs2) add_module "configfs" ;;
        libcrc32c) add_module "crc32c"; add_module "crc32c_intel" ;;
    esac
}

add_binary ()
{
    local bin dest lib

    bin=$(type -P "$1")
    dest=$2

    if [[ ! -f "$bin" ]]; then
        err "'$1' is not a file"
        return 1
    fi

    case "$(file -b "$bin")" in
        *script*)
            msg "   adding '${type}' script, ensure proper interp exists..."
            add_file "$bin" ${dest+"$dest"}
            ;;
        *executable*|*shared\ object*|*symbolic\ link*)
            add_file "$bin" ${dest+"$dest"}
            # note, this will also handle 'not a dynamic executable' spit out
            # by static binaries... the deps will produce nothing
            while read -r lib; do
                [[ -f "$lib" ]] && add_file "$lib"
            done < <(ldd "$bin" 2>/dev/null | sed '1d;s|.*=>\(.*\)|\1|;s/(0x[0-9a-f]\+)//')
            ;;
        *)
            err "unknown type '$type' for binary '$bin'"
            return 1
            ;;
    esac
}

parse_hook ()
{
    local mod bin fil
    for mod in ${MODULES}; do
        if [ -n "${mod}" ]; then
            add_module "${mod}"
        fi
    done

    for bin in ${BINARIES}; do
        if [ -n "${bin}" ]; then
            add_binary "${bin}"
        fi
    done

    for fil in ${FILES}; do
        if [ -n "${fil}" ]; then
            add_file "${fil}"
        fi
    done

    if [ -n "${SCRIPT}" ]; then
        add_file "${HOOKDIR}/${SCRIPT}" "/hooks/${SCRIPT}"
    fi
}
# vim: set ft=sh ts=4 sw=4 et: