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# Shell version of something similar to the System V 'idtune' command

##################### FUNCTION DEFINITIONS #######################

# Call with the $0 of the script as a parameter; this commands writes the
# name of the directory containing the script to standard output.
# Example:
#	conf_path $0

conf_path () {
	set `which $1 2>/dev/null` X
	if [ $# -ne 2 ]; then
		echo .		# Assume the current directory.
		return 1
	fi
	set `expr $1 : '\(.*\)/.*'` X
	if [ $# -ne 2 ]; then
		echo .		# Must be in the current directory.
	else
		echo $1
	fi
	return 0
}

# Report a usage message to standard output, with the name of the script
# passed as the argument to this function.

usage () {
	echo $1 ": Change values of configurable parameters"
	echo "usage :\t[-f] [-m] param value [param value] ..."
	echo "\t-f suppresses interactive confirmation of the change"
	echo "\t-m specifies that the current value be raised to the given minimum"
}

# Read the mtune/stune parameters for a variable into shell globals

read_mstune () {
	ggrep ^"$1$WHITESPACE" $CONF_DIR/[ms]tune 2>/dev/null 1>&2
	if [ $? -ne 0 ]; then
		echo There is no installed tunable parameter called $1 1>&2
		return 1
	fi
	set `grep "^$1$WHITESPACE" $CONF_DIR/mtune 2>/dev/null` \
	    `grep "^$1$WHITESPACE" $CONF_DIR/stune 2>/dev/null`
	MTUNE_MIN=$2
	MTUNE_DEFAULT=$3
	MTUNE_MAX=$4
	if [ $# -gt 4 ]; then
		STUNE_VALUE=$6
	else
		STUNE_VALUE=$3
	fi
	OLD_STUNE_VALUE=$STUNE_VALUE
}

# Update the value of a tunable parameter

write_mstune () {
	if [ $OLD_STUNE_VALUE -eq $2 ]; then
		return 0
	fi
	if [ $2 -lt $MTUNE_MIN -o $2 -gt $MTUNE_MAX ]; then
		echo The new value is not within the legal range of values. \
			1>&2
		return 1
	fi

	$HOME_DIR/devadm -I $CONF_DIR -s"$1 $2" -W
}

# Confirm the parameter change

ask () {
	echo Tunable parameter $1 is currently set to $2.
	echo -n Is it OK to change it to $3"? (y/n) "
	read yesno
	[ "$yesno" = "y" ]
	return $?
}

HOME_DIR=`conf_path $0`
CONF_DIR=$HOME_DIR/..
WHITESPACE="	 "		: A space and a tab

if [ $# -lt 1 ]; then
	usage $0 1>&2
	exit 100
fi

while [ $# -gt 1 ]; do
	ARG=$1; shift
	case $ARG in
	-f)	FORCE=1
		;;

	-m)	MINIMUM=1
		;;

	*)	read_mstune $ARG || exit 1

		# If there is no change, do nothing. If there is a minimum and
		# the current value is large enough, do nothing. Otherwise,
		# make the change if forced or the user confirms.

		if [ $STUNE_VALUE -ne $1 -a \
			\( -z "$MINIMUM" -o $STUNE_VALUE -lt $1 \) ] &&
		   ([ -n "$FORCE" ] || ask $ARG $STUNE_VALUE $1) then
			write_mstune $ARG $1
		fi
		shift
		;;
	esac
done

if [ $# -ne 0 ]; then
	usage $0 1>&2
	exit 100
fi

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