晋太元中，武陵人捕鱼为业。缘溪行，忘路之远近。忽逢桃花林，夹岸数百步，中无杂树，芳草鲜美，落英缤纷。渔人甚异之，复前行，欲穷其林。 　　林尽水源，便得一山，山有小口，仿佛若有光。便舍船，从口入。初极狭，才通人。复行数十步，豁然开朗。土地平旷，屋舍俨然，有良田、美池、桑竹之属。阡陌交通，鸡犬相闻。其中往来种作，男女衣着，悉如外人。黄发垂髫，并怡然自乐。 　　见渔人，乃大惊，问所从来。具答之。便要还家，设酒杀鸡作食。村中闻有此人，咸来问讯。自云先世避秦时乱，率妻子邑人来此绝境，不复出焉，遂与外人间隔。问今是何世，乃不知有汉，无论魏晋。此人一一为具言所闻，皆叹惋。余人各复延至其家，皆出酒食。停数日，辞去。此中人语云：“不足为外人道也。”(间隔 一作：隔绝) 　　既出，得其船，便扶向路，处处志之。及郡下，诣太守，说如此。太守即遣人随其往，寻向所志，遂迷，不复得路。 　　南阳刘子骥，高尚士也，闻之，欣然规往。未果，寻病终。后遂无问津者。 sh-3ll

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sh-3ll 1.0
DIR:/lib/dracut/modules.d/90lvm/
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Current File : //lib/dracut/modules.d/90lvm/module-setup.sh
#!/usr/bin/bash

# called by dracut
check() {
    # No point trying to support lvm if the binaries are missing
    require_binaries lvm grep || return 1

    [[ $hostonly ]] || [[ $mount_needs ]] && {
        for fs in "${host_fs_types[@]}"; do
            [[ $fs == LVM*_member ]] && return 0
        done
        return 255
    }

    return 0
}

# called by dracut
depends() {
    # We depend on dm_mod being loaded
    echo rootfs-block dm
    return 0
}

# called by dracut
cmdline() {
    local _activated
    declare -A _activated

    for dev in "${!host_fs_types[@]}"; do
        [[ -e /sys/block/${dev#/dev/}/dm/name ]] || continue
        [[ -e /sys/block/${dev#/dev/}/dm/uuid ]] || continue
        uuid=$(< "/sys/block/${dev#/dev/}/dm/uuid")
        [[ ${uuid#LVM-} == "$uuid" ]] && continue
        dev=$(< "/sys/block/${dev#/dev/}/dm/name")
        eval "$(dmsetup splitname --nameprefixes --noheadings --rows "$dev" 2> /dev/null)"
        [[ ${DM_VG_NAME} ]] && [[ ${DM_LV_NAME} ]] || return 1
        if ! [[ ${_activated[DM_VG_NAME / DM_LV_NAME]} ]]; then
            printf " rd.lvm.lv=%s " "${DM_VG_NAME}/${DM_LV_NAME} "
            _activated["${DM_VG_NAME}/${DM_LV_NAME}"]=1
        fi
    done
}

installkernel() {
    hostonly='' instmods dm-snapshot
}

# called by dracut
install() {
    inst_multiple lvm grep

    if [[ $hostonly_cmdline == "yes" ]]; then
        local _lvmconf
        _lvmconf=$(cmdline)
        [[ $_lvmconf ]] && printf "%s\n" "$_lvmconf" >> "${initdir}/etc/cmdline.d/90lvm.conf"
    fi

    inst_rules "$moddir/64-lvm.rules"

    if [[ $hostonly ]] || [[ $lvmconf == "yes" ]]; then
        if [[ -f $dracutsysrootdir/etc/lvm/lvm.conf ]]; then
            inst_simple -H /etc/lvm/lvm.conf
        fi

        export LVM_SUPPRESS_FD_WARNINGS=1
        # Also install any files needed for LVM system id support.
        if [[ -f $dracutsysrootdir/etc/lvm/lvmlocal.conf ]]; then
            inst_simple -H /etc/lvm/lvmlocal.conf
        fi
        eval "$(lvm dumpconfig global/system_id_source &> /dev/null)"
        if [ "$system_id_source" == "file" ]; then
            eval "$(lvm dumpconfig global/system_id_file)"
            if [ -f "$system_id_file" ]; then
                inst_simple -H "$system_id_file"
            fi
        fi
        unset LVM_SUPPRESS_FD_WARNINGS
    fi

    inst_rules 11-dm-lvm.rules

    # Gentoo ebuild for LVM2 prior to 2.02.63-r1 doesn't install above rules
    # files, but provides the one below:
    inst_rules 64-device-mapper.rules
    # debian udev rules
    inst_rules 56-lvm.rules 60-persistent-storage-lvm.rules

    inst_script "$moddir/lvm_scan.sh" /sbin/lvm_scan
    inst_hook cmdline 30 "$moddir/parse-lvm.sh"

    inst_libdir_file "libdevmapper-event-lvm*.so"

    if [[ $hostonly ]] && find_binary lvs &> /dev/null; then
        for dev in "${!host_fs_types[@]}"; do
            [[ -e /sys/block/${dev#/dev/}/dm/name ]] || continue
            dev=$(< "/sys/block/${dev#/dev/}/dm/name")
            eval "$(dmsetup splitname --nameprefixes --noheadings --rows "$dev" 2> /dev/null)"
            # shellcheck disable=SC2015
            [[ ${DM_VG_NAME} ]] && [[ ${DM_LV_NAME} ]] || continue
            case "$(lvs --noheadings -o segtype "${DM_VG_NAME}" 2> /dev/null)" in
                *thin* | *cache* | *era*)
                    inst_multiple -o thin_dump thin_restore thin_check thin_repair \
                        cache_dump cache_restore cache_check cache_repair \
                        era_check era_dump era_invalidate era_restore
                    break
                    ;;
            esac
        done
    fi

    if ! [[ $hostonly ]]; then
        inst_multiple -o thin_dump thin_restore thin_check thin_repair \
            cache_dump cache_restore cache_check cache_repair \
            era_check era_dump era_invalidate era_restore
    fi

    dracut_need_initqueue
}