Overhaul dhcpcd for chrome os use

dhcpcd-run-hooks.in

-#!/bin/sh
-# dhcpcd client configuration script 
-
-# Handy variables and functions for our hooks to use
-from=from
-signature_base="# Generated by dhcpcd"
-signature="$signature_base $from $interface"
-signature_base_end="# End of dhcpcd"
-signature_end="$signature_base_end $from $interface"
-state_dir=/var/run/dhcpcd
-
-# Ensure that all arguments are unique
-uniqify()
-{
-        local result= i=
-        for i; do
-                case " $result " in
-                        *" $i "*);;
-                        *) result="$result $i";;
-                esac
-        done
-        echo "${result# *}"
-}
-
-# List interface config files in a dir
-# If dhcpcd is running as a single instance then it will have a list of
-# interfaces in the preferred order.
-# Otherwise we just use what we have.
-list_interfaces()
-{
-        local i= x= ifaces=
-        for i in $interface_order; do
-                [ -e "$1/$i" ] && ifaces="$ifaces${ifaces:+ }$i"
-        done
-        for x in "$1"/*; do
-                [ -e "$x" ] || continue
-                for i in $interface_order; do
-                        if [ $i = "${x##*/}" ]; then
-                                unset x
-                                break
-                        fi
-                done
-                [ -n "$x" ] && ifaces="$ifaces${ifaces:+ }${x##*/}"
-        done
-        echo "$ifaces"
-}
-
-# We normally use sed to extract values using a key from a list of files
-# but sed may not always be available at the time.
-key_get_value()
-{
-        local key="$1" value= x= line=
-
-        shift
-        if type sed >/dev/null 2>&1; then
-                sed -n "s/^$key//p" $@
-        else
-                for x; do
-                        while read line; do
-                                case "$line" in
-                                "$key"*) echo "${line##$key}";;
-                                esac
-                        done < "$x"
-                done
-        fi
-}
-
-# We normally use sed to remove markers from a configuration file
-# but sed may not always be available at the time.
-remove_markers()
-{
-        local m1="$1" m2="$2" x= line= in_marker=0
-
-        shift; shift
-        if type sed >/dev/null 2>&1; then
-                sed "/^$m1/,/^$m2/d" $@
-        else
-                for x; do
-                        while read line; do
-                                case "$line" in
-                                "$m1"*) in_marker=1;;
-                                "$m2"*) in_marker=0;;
-                                *) [ $in_marker = 0 ] && echo "$line";;
-                                esac
-                        done < "$x"
-                done
-        fi
-}
-
-# Compare two files
-# If different, replace first with second otherwise remove second
-change_file()
-{
-        if type cmp >/dev/null 2>&1; then
-                cmp -s "$1" "$2"
-        elif type diff >/dev/null 2>&1; then
-                diff -q "$1" "$2" >/dev/null
-        else
-                # Hopefully we're only working on small text files ...
-                [ "$(cat "$1")" = "$(cat "$2")" ]
-        fi
-        if [ $? -eq 0 ]; then
-                rm -f "$2"
-                return 1
-        fi
-        cat "$2" > "$1"
-        rm -f "$2"
-        return 0
-}
-
-# Save a config file
-save_conf()
-{
-        if [ -f "$1" ]; then
-                rm -f "$1-pre.$interface"
-                cat "$1" > "$1-pre.$interface"
-        fi
-}
-
-# Restore a config file
-restore_conf()
-{
-        [ -f "$1-pre.$interface" ] || return 1
-        cat "$1-pre.$interface" > "$1"
-        rm -f "$1-pre.$interface"
-}
-
-# Write a syslog entry
-syslog()
-{
-        local lvl="$1"
-
-        [ -n "$lvl" ] && shift
-        if [ -n "$@" ]; then
-                if type logger >/dev/null 2>&1; then
-                        logger -t dhcpcd -p daemon."$lvl" -s "$@"
-                fi
-        fi
-}
-
-
-# We source each script into this one so that scripts run earlier can
-# remove variables from the environment so later scripts don't see them.
-# Thus, the user can create their dhcpcd.enter/exit-hook script to configure
-# /etc/resolv.conf how they want and stop the system scripts ever updating it.
-for hook in \
-        @SYSCONFDIR@/dhcpcd.enter-hook \
-        @HOOKDIR@/* \
-        @SYSCONFDIR@/dhcpcd.exit-hook
-do
-        for skip in $skip_hooks; do
-                case "$hook" in
-                        */"$skip")                      continue 2;;
-                        */[0-9][0-9]"-$skip")           continue 2;;
-                        */[0-9][0-9]"-$skip.sh")        continue 2;;
-                esac
-        done
-        if [ -f "$hook" ]; then
-                . "$hook"
-        fi
-done