Subversion Repositories configs

#!/bin/sh

#

# ktune		ktune sysctls

#

# chkconfig: - 27 99

# description:	Applies and reverts ktune sysctl settings

#

# config: /etc/sysctl.ktune

# config: /etc/sysconfig/ktune

#

# Source function library.

. /etc/init.d/functions

# Source ktune configureation.

if [ -f /etc/sysconfig/ktune ] ; then

    . /etc/sysconfig/ktune

else

    echo -n $"$0: /etc/sysconfig/ktune does not exist."; warning; echo

    exit 5

fi

VAR_SUBSYS_KTUNE=/var/lock/subsys/ktune

SAVE_FILE="/var/run/ktune.save"

SYSCTL_SET="/sbin/sysctl -q -w "

SYSCTL_GET="/sbin/sysctl -e"

KERNEL_ELEVATOR="cfq"

/bin/fgrep -q 'elevator=' /proc/cmdline

CMDLINE_ELEVATOR=$?

if [ -n "$ELEVATOR_TUNE_DEVS" ]; then

	SYS_BLOCK_SDX=

	for file in $(eval LANG=C /bin/ls -1d "${ELEVATOR_TUNE_DEVS}" 2>/dev/null); do

		if ! expr match $(readlink -f "$file") '^/sys/.*/queue/scheduler$' >/dev/null; then

			printf $"$0: '%s' is not a scheduler control file." "$file"

			warning; echo

		else

			SYS_BLOCK_SDX="$SYS_BLOCK_SDX $file"

		fi

	done

else

	SYS_BLOCK_SDX=

fi

declare -a KTUNE_FILES

if [ -r "$SYSCTL" ]; then

    KTUNE_FILES[0]="$SYSCTL"

fi

if [ "x$USE_KTUNE_D" = "xyes" ]; then

    while read file; do

	[ -r "$file" ] || continue

	KTUNE_FILES[${#KTUNE_FILES[*]}]="${file}"

    done <<EOF

$(LANG=C /bin/ls -1 /etc/ktune.d/*.conf 2>/dev/null)

EOF

fi

function is_int

{

  [ ! -z "${1##*[^0-9]*}" ]

}

load_file() {

    local file=$1

    local save=$2

    local curr_value

    ret_s=0

    errors=

    # apply ktune settings

    while read line; do

	[ "${line:0:1}" == "#" -o "${line:0:1}" == ";" ] && continue

	[ -z "$line" ] && continue

	key=$(echo $line | awk '{ match($0,"[ \t]*=[ \t]*") && $0=substr($0,1,RSTART-1); print $0}')

	value=$(echo $line | awk '/=/ { match($0,"[ \t]*=[ \t]*"); $0=substr($0,RSTART+RLENGTH); print $0}')

	curr_value=""

	if [ "${value:0:1}" = '>' ]; then

	    value=${value:1}

	    curr_value=$($SYSCTL_GET -n "$key")

	fi

	if [ "${value:0:1}" = '$' ]; then

	    value=${value:1}

	    value=${!value}

	fi

	is_int "$curr_value" && is_int "$value" && [ "$value" -lt "$curr_value" ] && value="$curr_value"

	[ $save -ne 0 ] && save_value=$($SYSCTL_GET "$key")

	setting=$key

	if [ "$value" ]; then

	    [ -n "$value" ] && setting+="=${value}"

	    error="$($SYSCTL_SET "${setting}" 2>&1)"

	    ret=$?

	    if [ $save -ne 0 -a $ret -eq 0 ] && ! grep -q "^${key} =" $SAVE_FILE 2>/dev/null; then

	        echo "$save_value" >> "$SAVE_FILE"

	    fi

	    [ -n "$error" ] && errors+="${error}\n"

	    let ret_s+=$ret

	fi

    done < "$file"

    if [ $ret_s -eq 0 ]; then

	success; echo

    else

	failure; echo; ret=1

	echo -e "$errors" | while read line; do echo -e "  ${line}"; done

    fi

}

call_script() {

    local script=$1

    local option=$2

    if [ -x "$script" ]; then

	echo -n "Calling '$script $option': "

	("$script" "$option")

	ret=$?

	if [ $ret -eq 0 ]; then

	    success; echo

	else

	    failure; echo; ret=1

	fi

    fi

}

load_sysctl() {

    # Remove save file

    /bin/rm -f "$SAVE_FILE"

    if [ ${#KTUNE_FILES[@]} -gt 0 ]; then

        # Apply general sysctl settings beforehand

	for f in $SYSCTL_PRE; do

	    if [ -r "$f" ]; then

		echo $"Applying sysctl settings from $f"

		sysctl -e -p "$f" >/dev/null 2>&1

	    fi

	done

	echo $"Applying ktune sysctl settings:"

	# Apply ktune files.

	for file in "${KTUNE_FILES[@]}"; do

	    echo -n $"$file: "

	    load_file "$file" 1

	    call_script "${file%.conf}.sh" start

	done

        # Apply general sysctl settings afterwards

	for f in $SYSCTL_POST; do

	    if [ -r "$f" ]; then

		echo $"Applying sysctl settings from $f"

		sysctl -e -p "$f" >/dev/null 2>&1

	    fi

	done

    fi

}

revert_sysctl() {

    if [ -r "$SAVE_FILE" ]; then

	if [ "$KTUNE_REVERT_SYSCTL" = 1 ]; then

	    echo -n $"Reverting to saved sysctl settings: "

	    load_file "$SAVE_FILE" 0

	fi

	/bin/rm -f "$SAVE_FILE"

    fi

    if [ ${#KTUNE_FILES[@]} -gt 0 ]; then

	for file in "${KTUNE_FILES[@]}"; do

	    call_script "${file%.conf}.sh" stop

	done

    fi

}

start() {

    [ "$EUID" != "0" ] && exit 4

    ret=0

    # if no elevator on command line, apply the ktune elevator

    if [ -n "$ELEVATOR" -a -n "$SYS_BLOCK_SDX" -a $CMDLINE_ELEVATOR -ne 0 ]; then

	ret_e=0

	echo -n $"Applying ${ELEVATOR} elevator: "

	for i in $SYS_BLOCK_SDX; do

	    dev="${i%%/queue*}"; echo -n "${dev##*/} "

	    echo "$ELEVATOR" > "$i" 2>/dev/null;

	    let ret_e+=$?

	done

	if [ $ret_e -eq 0 ]; then

	    success; echo

	else

	    failure; echo; ret=1

	fi

    fi

    load_sysctl

    /bin/touch $VAR_SUBSYS_KTUNE

    return $ret

}

reload() {

    [ "$EUID" != "0" ] && exit 4

    revert_sysctl

    load_sysctl

}

stop() {

    [ "$EUID" != "0" ] && exit 4

    ret=0

    revert_sysctl

    # if no elevator on command line, apply the default elevator

    if [ -n "$ELEVATOR" -a -n "$SYS_BLOCK_SDX" -a $CMDLINE_ELEVATOR -ne 0 ]; then

	ret_e=0

	echo -n $"Reverting to ${KERNEL_ELEVATOR} elevator: "

	for i in $SYS_BLOCK_SDX; do

	    dev="${i%%/queue*}"; echo -n "${dev##*/} "

	    echo "$KERNEL_ELEVATOR" > "$i" 2>/dev/null;

	    let ret_e+=$?

	done

	if [ $ret_e -eq 0 ]; then

	    success; echo

	else

	    failure; echo; ret=1

	fi

    fi

    /bin/rm -f $VAR_SUBSYS_KTUNE

    return $ret

}

status() {

    [ "$EUID" != "0" ] && exit 4

    if [ ! -f "$VAR_SUBSYS_KTUNE" ]; then

	echo $"ktune settings are not applied."

	return 3

    fi

    echo $"Current ktune sysctl settings:"

    if [ -e $SAVE_FILE ]; then

        keys=$(awk '/^[#;]/ { next } /=/ { match($1,"=") && $1=substr($1,1,RSTART-1); print $1 }' "$SAVE_FILE")

        for key in $keys; do

	    $SYSCTL_GET $key

        done

    else

        echo $"None"

    fi

    if [ -n "$ELEVATOR" -a -n "$SYS_BLOCK_SDX" -a $CMDLINE_ELEVATOR -ne 0 ]; then

	echo

	echo $"Current elevator settings:"

	for i in $SYS_BLOCK_SDX; do

	    echo -n "${i}: "; cat "$i"

	done

    fi

    return 0

}

case "$1" in

    start)

	[ -f "$VAR_SUBSYS_KTUNE" ] && exit 0

	start

	RETVAL=$?

	;;

    stop)

	[ -f "$VAR_SUBSYS_KTUNE" ] || exit 0

	stop

	RETVAL=$?

	;;

    reload)

	[ -f "$VAR_SUBSYS_KTUNE" ] && reload

	RETVAL=$?

	;;

    restart|force-reload)

	[ -f "$VAR_SUBSYS_KTUNE" ] && stop

	start

	RETVAL=$?

	;;

    condrestart|try-restart)

	[ -f "$VAR_SUBSYS_KTUNE" ] || exit 0

	stop

	start

	RETVAL=$?

	;;

    status)

	status

	RETVAL=$?

	;;

    *)

	echo $"Usage: $0 {start|stop|restart|condrestart|status}"

	RETVAL=2

	;;

esac

exit $RETVAL