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。 .
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Current File : //lib/dracut/modules.d/40network/netroot.sh
#!/bin/sh

PATH=/usr/sbin:/usr/bin:/sbin:/bin
command -v getarg >/dev/null    || . /lib/dracut-lib.sh
command -v setup_net >/dev/null || . /lib/net-lib.sh

# Huh? Empty $1?
[ -z "$1" ] && exit 1

# [ ! -z $2 ] means this is for manually bringing up network
# instead of real netroot; If It's called without $2, then there's
# no sense in doing something if no (net)root info is available
# or root is already there
[ -d $NEWROOT/proc ] && exit 0

if [ -z "$netroot" ]; then
    netroot=$(getarg netroot=)
fi

[ -z "$netroot" ] && exit 1

# Set or override primary interface
netif=$1
[ -e "/tmp/net.bootdev" ] && read netif < /tmp/net.bootdev

case "$netif" in
    ??:??:??:??:??:??)  # MAC address
        for i in /sys/class/net/*/address; do
            mac=$(cat $i)
            if [ "$mac" = "$netif" ]; then
                i=${i%/address}
                netif=${i##*/}
                break
            fi
        done
esac

# Figure out the handler for root=dhcp by recalling all netroot cmdline
# handlers when this is not called from manually network bringing up.
if [ -z "$2" ]; then
    if getarg "root=dhcp" || getarg "netroot=dhcp" || getarg "root=dhcp6" || getarg "netroot=dhcp6"; then
        # Load dhcp options
        [ -e /tmp/dhclient.$netif.dhcpopts ] && . /tmp/dhclient.$netif.dhcpopts

        # If we have a specific bootdev with no dhcpoptions or empty root-path,
        # we die. Otherwise we just warn
        if [ -z "$new_root_path" ] ; then
            [ -n "$BOOTDEV" ] && die "No dhcp root-path received for '$BOOTDEV'"
            warn "No dhcp root-path received for '$netif' trying other interfaces if available"
            exit 1
        fi

        rm -f -- $hookdir/initqueue/finished/dhcp.sh

        # Set netroot to new_root_path, so cmdline parsers don't call
        netroot=$new_root_path

        # FIXME!
        unset rootok
        for f in $hookdir/cmdline/90*.sh; do
            [ -f "$f" ] && . "$f";
        done
    else
        rootok="1"
    fi

    # Check: do we really know how to handle (net)root?
    [ -z "$root" ] && die "No or empty root= argument"
    [ -z "$rootok" ] && die "Don't know how to handle 'root=$root'"

    handler=${netroot%%:*}
    handler=${handler%%4}
    handler=$(command -v ${handler}root)
    if [ -z "$netroot" ] || [ ! -e "$handler" ] ; then
        die "No handler for netroot type '$netroot'"
    fi
fi

# Source netroot hooks before we start the handler
source_hook netroot $netif

# Run the handler; don't store the root, it may change from device to device
# XXX other variables to export?
[ -n "$handler" ] && "$handler" "$netif" "$netroot" "$NEWROOT"
save_netinfo $netif

exit 0

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