Overhaul dhcpcd for chrome os use

dhcpcd-hooks/50-ntp.conf

-# Sample dhcpcd hook script for ntp
-# Like our resolv.conf hook script, we store a database of ntp.conf files
-# and merge into /etc/ntp.conf
-
-# You can set the env var NTP_CONF to another file like this
-#   dhcpcd -e NTP_CONF=/usr/pkg/etc/ntpd.conf
-# or by adding this to /etc/dhcpcd.enter-hook
-#   NTP_CONF=/usr/pkg/etc/ntpd.conf
-# to use openntpd from pkgsrc instead of the system provided ntp.
-
-# Detect OpenRC or BSD rc
-# Distributions may want to just have their command here instead of this
-if type rc-service >/dev/null 2>&1 && rc-service --exists ntpd; then
-        ntpd_restart_cmd="rc-service ntpd -- -Ds restart"
-elif [ -x /etc/rc.d/ntpd ]; then
-        ntpd_restart_cmd="/etc/rc.d/ntpd status >/dev/null 2>&1 && /etc/rc.d/ntpd restart"
-elif [ -x /usr/local/etc/rc.d/ntpd ]; then
-        ntpd_restart_cmd="/usr/local/etc/rc.d/ntpd status >/dev/null 2>&1 && /usr/local/etc/rc.d/ntpd restart"
-fi
-
-ntp_conf_dir="$state_dir/ntp.conf"
-ntp_conf=${NTP_CONF:-/etc/ntp.conf}
-
-build_ntp_conf()
-{
-        local cf="$state_dir/ntp.conf.$interface"
-        local interfaces= header= srvs= servers= x=
-
-        # Build a list of interfaces
-        interfaces=$(list_interfaces "$ntp_conf_dir")
-
-        if [ -n "$interfaces" ]; then
-                # Build the header
-                for x in ${interfaces}; do
-                        header="$header${header:+, }$x"
-                done
-
-                # Build a server list
-                srvs=$(cd "$ntp_conf_dir";
-                        key_get_value "server " $interfaces)
-                if [ -n "$srvs" ]; then
-                        for x in $(uniqify $srvs); do
-                                servers="${servers}server $x\n"
-                        done
-                fi
-        fi
-
-        # Merge our config into ntp.conf
-        [ -e "$cf" ] && rm -f "$cf"
-        [ -d "$ntp_conf_dir" ] || mkdir -p "$ntp_conf_dir"
-        if [ -e "$ntp_conf" ]; then
-                remove_markers "$signature_base" "$signature_base_end" \
-                        "$ntp_conf" > "$cf"
-        fi
-        if [ -n "$servers" ]; then
-                echo "$signature_base${header:+ $from }$header" >> "$cf"
-                printf "$search$servers" >> "$cf"
-                echo "$signature_base_end${header:+ $from }$header" >> "$cf"
-        fi
-
-        # If we changed anything, restart ntpd
-        if change_file "$ntp_conf" "$cf"; then
-                [ -n "$ntpd_restart_cmd" ] && eval $ntpd_restart_cmd
-        fi
-}
-
-add_ntp_conf()
-{
-        local cf="$ntp_conf_dir/$interface" x=
-
-        [ -e "$cf" ] && rm "$cf"
-        [ -d "$ntp_conf_dir" ] || mkdir -p "$ntp_conf_dir"
-        if [ -n "$new_ntp_servers" ]; then
-                for x in $new_ntp_servers; do
-                        echo "server $x" >> "$cf"
-                done
-        fi
-        build_ntp_conf
-}
-
-remove_ntp_conf()
-{
-        if [ -e "$ntp_conf_dir/$interface" ]; then
-                rm "$ntp_conf_dir/$interface"
-        fi
-        build_ntp_conf
-}
-
-case "$reason" in
-BOUND|INFORM|REBIND|REBOOT|RENEW|TIMEOUT|STATIC)        add_ntp_conf add;;
-PREINIT|EXPIRE|FAIL|IPV4LL|NAK|NOCARRIER|RELEASE|STOP)  remove_ntp_conf del;;
-esac