lfs-book-zh_CN/bootscripts/lfs/sysconfig/network-devices/ifup

#!/bin/sh
########################################################################
# Begin $network_devices/ifup
#
# Description : Interface Up
#
# Authors     : Nathan Coulson - nathan@linuxfromscratch.org
#               Kevin P. Fleming - kpfleming@linuxfromscratch.org
#
# Version     : 00.00
#
# Notes       : the IFCONFIG variable is passed to the scripts found
#               in the services directory, to indicate what file the
#               service should source to get environmental variables.
#
########################################################################

. /etc/sysconfig/rc 
. ${rc_functions} 

# Collect a list of configuration files for our interface
if [ -n "${2}" ]; then
	for file in ${@#$1} # All parameters except $1
  do
		FILES="${FILES} ${network_devices}/ifconfig.${1}/${file}"
	done
elif [ -d "${network_devices}/ifconfig.${1}" ]; then
	FILES=`echo ${network_devices}/ifconfig.${1}/*`
else 
	FILES="${network_devices}/ifconfig.${1}"
fi

boot_mesg "Bringing up the ${1} interface..."
boot_mesg_flush

# Process each configruation file
for file in ${FILES}; do
	# skip backup files
	if [ "${file}" != "${file%""~""}" ]; then
		continue
	fi

	if [ ! -f "${file}" ]; then
		boot_mesg "${file} is not a network configuration file or directory." ${WARNING}
		echo_warning
		continue
	fi

	(
		. ${file}

		# Will not process this service if started by boot, and ONBOOT
		# is not set to yes
		if [ "${IN_BOOT}" = "1" -a "${ONBOOT}" != "yes" ]; then
			continue
		fi
		# Will not process this service if started by hotplug, and 
		# ONHOTPLUG is not set to yes
		if [ "${IN_HOTPLUG}" = "1" -a "${ONHOTPLUG}" != "yes" \
                    -a "${HOSTNAME}" != "(none)" ]; then continue
		fi

		if [ -n "${SERVICE}" -a -x "${network_devices}/services/${SERVICE}" ]; then
			if [ -z "${CHECK_LINK}" -o "${CHECK_LINK}" = "y" \
                            -o "${CHECK_LINK}" = "yes" -o "${CHECK_LINK}" = "1" ]; then
				if ip link show ${1} > /dev/null 2>&1; then
					link_status=`ip link show ${1}`
					if [ -n "${link_status}" ]; then
						if ! echo "${link_status}" | grep -q UP; then
							ip link set ${1} up
						fi
					fi
				else
					boot_mesg "Interface ${1} doesn't exist." ${WARNING}
					echo_warning
					continue
				fi
			fi
			IFCONFIG=${file} ${network_devices}/services/${SERVICE} ${1} up
		else
			boot_mesg "Unable to process ${file}.  Either" ${FAILURE}
			boot_mesg " the SERVICE variable was not set,"
			boot_mesg " or the specified service cannot be executed."
			echo_failure
			continue
		fi
	)
done

# End $network_devices/ifup