#!/bin/sh

# this script makes an attempt to build a proper set of rules
# for loading the Zaptel modules and automatically running ztcfg
#
# it accepts three parameters:
#   the kernel major version being targeted (either linux24 or linux26)
#   the root prefix to be used for finding/creating the files
#   the list of module names being installed
#
# the process is as follows:
#
# for linux24, the file can be located either at /etc/modules.conf (combined
# with all other rules) or in /etc/modutils/zaptel (only the Zaptel rules)
#
# for linux26, the file can be located at /etc/modprobe.conf (combined with all
# other rules), /etc/modprobe.d/zaptel (Zaptel only) or /etc/modules.d/zaptel
# (Zaptel only)
#
# when the file is Zaptel rules only, then we don't preserve the existing
# contents of the file; the system administrator can put desired options and
# overrides in a separate file with a name that appears earlier in the sort
# order, so there is no need to edit the file produced by this script
#
# when the file is combined with all other rules, then we make a backup
# of it and remove all the old Zaptel rules we can find, replacing them with
# new ones
#
# in addition, for linux26, versions of module-init-tools 3.2.0 and later
# have the ability to pass module parameters specified on the modprobe command
# line to commands in 'install' rules, thus keeping them from being lost, so
# we try to determine what version is installed and take advantage of that

if [ "${1}" = "linux24" ]; then
    if [ -d ${2}/etc/modutils ]; then
	target=${2}/etc/modutils/zaptel
    elif [ -f ${2}/etc/modules.conf ]; then
	target=${2}/etc/modules.conf
	combined=1
    else
	echo No suitable location for module rules can be found... exiting.
	exit 1
    fi
elif [ "${1}" = "linux26" ]; then
    toolver=`/sbin/modprobe --version 2>/dev/null| awk '{print $3}' | cut -d. -f2 | cut -d- -f1`
    if [ ${toolver} -ge 2 ]; then
	cmdopts=\$CMDLINE_OPTS
    fi
    if [ -d ${2}/etc/modprobe.d ]; then
	target=${2}/etc/modprobe.d/zaptel
    elif [ -d ${2}/etc/modules.d ]; then
	target=${2}/etc/modules.d/zaptel
    elif [ -f ${2}/etc/modprobe.conf ]; then
	target=${2}/etc/modprobe.conf
	combined=1
    elif [ -f ${2}/etc/conf.modules ]; then
	target=${2}/etc/conf.modules
	combined=1
    else
	echo No suitable location for module rules can be found... exiting.
	exit 1
    fi
else
    echo Unknown kernel build version requested... exiting.
    exit 1
fi

if [ -n "${combined}" ]; then
    if [ -f ${target} ]; then
	mv ${target} ${target}.bak
	cat ${target}.bak | grep -v "alias char-major-250" | grep -v "alias char-major-196" > ${target}	
    fi
else
    if [ -f ${target} ]; then
	mv ${target} ${target}.bak
    fi
    echo "# automatically generated file; do not edit" > ${target}
fi

echo Building ${target}...

if [ "${1}" = "linux24" ]; then
    for mod in ${3}; do
	if ! grep -q "post-install ${mod} " ${target}; then
	    echo "post-install ${mod} /sbin/ztcfg" >> ${target}
	fi
    done
elif [ "${1}" = "linux26" ]; then
    for mod in ${3}; do
	if ! grep -q "install ${mod} " ${target}; then
	    echo "install ${mod} /sbin/modprobe --ignore-install ${mod} ${cmdopts} && /sbin/ztcfg" >> ${target}
	fi
    done
fi

if [ -z "${combined}" ]; then
    echo "***"
    echo "*** WARNING:"
    echo "*** If you had custom settings in ${target},"
    echo "*** they have been moved to ${target}.bak."
    echo "***"
    echo "*** In the future, do not edit ${target}, but"
    echo "*** instead put your changes in another file"
    echo "*** in the same directory so that they will not"
    echo "*** be overwritten by future Zaptel updates."
    echo "***"
fi