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|
#!/bin/bash
#
# systemtap Startup script for SystemTap scripts
#
# chkconfig: - 00 99
# description: SystemTap is a programmable kernel/application tracing tool.
# config: /etc/systemtap/config
# config: /etc/systemtap/conf.d
### BEGIN INIT INFO
# Provides: SystemTap scripts startup
# Required-Start: $local_fs
# Required-Stop: $local_fs
# Short-Description: Start and stop SystemTap scripts
# Description: SystemTap is a programmable kernel/application tracing tool.
### END INIT INFO
# Source function library.
. /etc/rc.d/init.d/functions
prog=systemtap
# Commands
STAP=@bindir@/stap
STAPRUN=@bindir@/staprun
UNAME=/bin/uname
LSMOD=/sbin/lsmod
# Path setup
SCRIPT_PATH=/etc/systemtap/script.d
CONFIG_PATH=/etc/systemtap/conf.d
CACHE_PATH=/var/cache/systemtap
STAT_PATH=/var/run/systemtap
TEMP_PATH=/tmp
LOG_FILE=/var/log/systemtap.log
# FAIL unless all scripts succeeded to run
PASSALL=yes
# Always follows script dependencies
RECURSIVE=no
# Automatically recompile scripts if caches are old or do not exist.
AUTOCOMPILE=yes
# Start these scripts by default. If omitted, all scripts are started.
DEFAULT_START=
# Allow cache only scripts
ALLOW_CACHEONLY=no
# Optional settings
CONFIG=/etc/systemtap/config
SCRIPTS=
KRELEASE=`uname -r`
OPT_RECURSIVE=
OPT_SCRIPTS=
OPTS=
OPT_ASSUMEYES=
echo_usage () {
echo $"Usage: $prog {start|stop|restart|status|compile|cleanup} [option]"
echo $"Options:"
echo $" -c configfile : specify config file"
echo $" -r kernelrelease: specify kernel release version"
echo $" -R : recursively dependency checking"
echo $" -y : answer yes for all questions."
echo $" script(s) : specify systemtap scripts"
}
#-----------------------------------------------------------------
# Helper functions
#-----------------------------------------------------------------
log () { # message
echo `LC_ALL=en date +"%b %e %T"`": $1" >> "$LOG_FILE"
}
clog () { # message [-n]
echo $2 "$1"
log "$1"
}
slog () { # message
logger "$1" # if syslogd is running, this message will be sent to syslog.
log "$1"
}
logex () { # command
eval log \"Exec: $@\"
"$@" >> "$LOG_FILE" 2>&1
return $?
}
do_warning () { # message
slog "Warning: $1"
warning "$1"
}
do_failure () { # message
slog "Error: $1"
failure "$1"
}
do_success () { # message
log "Pass: $1"
success "$1"
}
# Normalize options
check_bool () { # value
case $1 in
n|N|no|No|NO|0)
return 0;;
y|Y|yes|Yes|YES|1)
return 1;;
*)
return 2;;
esac
}
ask_yesno () { # message
local yn ret=2
[ "$OPT_ASSUMEYES" ] && return 1
while [ $ret -eq 2 ]; do
echo -n "$1 [y/N]: "
read yn
[ -z "$yn" ] && return 0
check_bool $yn
ret=$?
done
return $ret
}
#------------------------------------------------------------------
# Parameter parsing and setup options
#------------------------------------------------------------------
parse_args () { # arguments
while [ -n "$1" ]; do
case "$1" in
-c)
CONFIG=$2
shift 1
;;
-r)
KRELEASE=$2
shift 1
;;
-R)
OPT_RECURSIVE=1
;;
-y)
OPT_ASSUMEYES=1
;;
--)
;;
*)
OPT_SCRIPTS=$OPT_SCRIPTS\ $1
;;
esac
shift 1
done
}
CMD=$1
shift 1
OPTS=`getopt -s bash -u -o 'r:c:Ry' -- $@`
if [ $? -ne 0 ]; then
slog "Error: Argument parse error: $@"
failure $"parse error"
echo_usage
exit 3
fi
parse_args $OPTS
# Include configs
. "$CONFIG"
for f in "$CONFIG_PATH"/*.conf; do
if [ -f "$f" ]; then
. "$f"
fi
done
check_bool $PASSALL
PASSALL=$?
check_bool $RECURSIVE
RECURSIVE=$?
if [ "$OPT_RECURSIVE" ]; then # -r option overrides RECURSIVE.
RECURSIVE=1
fi
check_bool $AUTOCOMPILE
AUTOCOMPILE=$?
CACHE_PATH="$CACHE_PATH/$KRELEASE"
check_bool $ALLOW_CACHEONLY
ALLOW_CACHEONLY=$?
__get_all_scripts () {
local s
if [ $ALLOW_CACHEONLY -eq 1 ]; then
for s in "$CACHE_PATH"/*.ko; do
if [ -f "$s" ]; then
basename "$s" | sed s/\.ko$//g
fi
done
fi
for s in "$SCRIPT_PATH"/*.stp; do
if [ -f "$s" ]; then
basename "$s" | sed s/\.stp$//g
fi
done
}
get_all_scripts() {
__get_all_scripts | sort | uniq
}
if [ -z "$OPT_SCRIPTS" ]; then
SCRIPTS=`get_all_scripts | xargs`
RECURSIVE=1
else
SCRIPTS="$OPT_SCRIPTS"
fi
#------------------------------------------------------------------
# Main routine
#------------------------------------------------------------------
NR_FAILS=0
might_fail () { # message exitcode
if [ $PASSALL -eq 1 ]; then
do_failure "$1"
echo
[ -z "$2" ] && exit 1
exit $2
else
log "Warning: "$1
NR_FAILS=$((NR_FAILS+1))
return 0
fi
}
might_success () { # message
if [ $NR_FAILS -ne 0 ]; then
log "Warning: $NR_FAILS failure occurred."
do_warning "$1"
else
do_success "$1"
fi
return 0
}
get_all_runnings () {
local f
for f in "$STAT_PATH"/*; do
if [ -f "$f" ]; then
basename "$f"
fi
done
}
get_daemon_pid () { # script
cat "$STAT_PATH/$1"
}
check_running () { # script
local m f
f="$STAT_PATH/$1"
m=`$LSMOD | grep "^$1 "`
if [ "$m" ]; then
[ -f "$f" ] && return 0 # running
return 4 # another script is running
else
[ -f "$f" ] && return 1 # dead, but pidfile remains
return 3 # dead
fi
}
# check whether a script cache need to be updated.
check_cache () { # script opts
local s tmp tmp2
s=$1; shift 1
[ ! -f "$CACHE_PATH/$s.ko" -o ! -f "$CACHE_PATH/$s.opts" ] && return 1
if [ $ALLOW_CACHEONLY -ne 1 -o -f "$SCRIPT_PATH/$s.stp" ]; then
[ "$SCRIPT_PATH/$s.stp" -nt "$CACHE_PATH/$s.ko" ] && return 2
fi
tmp=`head -n 1 "$CACHE_PATH/$s.opts"`
tmp2=`$UNAME -a`
[ "$tmp" != "$tmp2" ] && return 3
tmp=`tail -n 1 "$CACHE_PATH/$s.opts"`
tmp2="$*"
[ "$tmp" != "$tmp2" ] && return 4
return 0
}
stap_getopt () { # opts
local ret
# TODO: support quoted options
getopt -s bash -u \
-l 'kelf,kmap::,ignore-vmlinux,ignore-dwarf,vp:' \
-o 'hVvtp:I:e:o:R:r:m:kgPc:x:D:bs:uqwl:d:L:FS:' -- $@
ret=$?
[ $ret -ne 0 ] && slog "Failed to parse parameters. ($@)"
return $ret
}
get_compile_opts () { # opts
local opts o skip
opts=`stap_getopt $*`
[ $? -ne 0 ] && return 1
skip=0
for o in $opts; do
if [ $skip -ne 0 ]; then skip=0; continue; fi
case $o in
-p|-m|-r|-c|-x|-e|-s|-o|-S)
skip=1 ;;
-h|-V|-k|-F)
;;
*)
echo -n $o" " ;;
esac
done
}
get_run_opts () { # normalized_opts
local opts o show mode
opts=`stap_getopt $*`
[ $? -ne 0 ] && return 1
mode='-L'
show=0
for o in $opts; do
case $o in
-c|-x|-s|-o|-S)
[ $o == '-s' ] && o='-b'
[ $o == '-o' ] && mode='-D'
echo -n $o" "
show=1
;;
*)
if [ $show -ne 0 ]; then
echo -n $o" "
show=0
fi
;;
esac
done
echo -n $mode
}
prepare_cache_dir () {
if [ ! -d "$CACHE_PATH" ]; then
logex mkdir -p "$CACHE_PATH"
[ $? -ne 0 ] && return 1
fi
return 0
}
prepare_stat_dir () {
if [ ! -d "$STAT_PATH" ]; then
logex mkdir -p "$STAT_PATH"
[ $? -ne 0 ] && return 1
fi
return 0
}
compile_script () { # script checkcache
local opts f tmpdir ret
eval f="$SCRIPT_PATH/$1.stp"
if [ ! -f "$f" ]; then
if [ $ALLOW_CACHEONLY -eq 1 ]; then
clog "Warning: no script file($f). Use compiled cache."
return 0
else
clog "Error: no script file($f)."
return 1
fi
fi
eval opts=\$$1_OPT
opts=`get_compile_opts $opts`
[ $? -ne 0 ] && return 2
if [ "$2" = "check" ]; then
check_cache $1 $opts
[ $? -eq 0 ] && return 0 # already compiled
if [ $AUTOCOMPILE -eq 0 ]; then
slog "No valid cache for $1"
return 1
fi
fi
clog " Compiling $1 ... " -n
tmpdir=`mktemp -d -p "$TEMP_PATH" cache.XXXXXXXX`
if [ $? -ne 0 ]; then
clog "Failed to create temporary directory."
return 1
fi
pushd "$tmpdir" &> /dev/null
logex $STAP -m "$1" -p4 -r $KRELEASE $opts "$f"
ret=$?
if [ $ret -eq 0 ]; then
$UNAME -a > "$1.opts"
echo $opts >> "$1.opts"
logex mv "$1.ko" "$1.opts" "$CACHE_PATH/"
ret=$?
else
slog "Failed to compile script($1)."
fi
popd &> /dev/null
rm -rf $tmpdir
[ $ret -eq 0 ] && clog "done" || clog "error"
return $ret
}
# dependency resolver
__SORTED=
__follow_dependency () { # script requesters
local opts r reqs s ret
s=$1
shift 1
r=`echo \ $*\ | grep \ $s\ `
if [ -n "$r" ]; then
might_fail $"Dependency loop detected on $s"
return 1
fi
r=`echo \ $__SORTED\ | grep \ $s\ `
[ -n "$r" ] && return 0 # already listed up
eval reqs=\$${s}_REQ
if [ -n "$reqs" ]; then
for r in $reqs; do
__follow_dependency $r $s $*
ret=$?
if [ $ret -ne 0 ]; then
return $ret # if one of requires failed, we can't run this script.
fi
done
fi
echo -n "$s "
return 0
}
sort_dependency () { # scripts
local s r=0
__SORTED=
for s in $*; do
__SORTED="$__SORTED "`__follow_dependency $s`
[ $? -ne 0 ] && return 1
done
echo $__SORTED
return 0
}
start_script () { # script
local tmpdir s=$1
check_running $s
ret=$?
[ $ret -eq 0 ] && return 0 # already running
if [ $ret -eq 4 ]; then
clog "$s is dead, but another script is running."
return 4
fi
compile_script $s check
ret=$?
[ $ret -ne 0 ] && return $ret
eval opts=\$${s}_OPT
opts=`get_run_opts $opts`
[ $? -ne 0 ] && return 2
clog " Starting $1 ... " -n
tmpdir=`mktemp -d -p "$TEMP_PATH" cache.XXXXXXXX` # bz7097
if [ $? -ne 0 ]; then
clog "Failed to create temporary directory."
return 1
fi
pushd "$tmpdir" &> /dev/null
eval log \"Exec: $STAPRUN $opts $CACHE_PATH/$s.ko\"
$STAPRUN $opts "$CACHE_PATH/$s.ko" 2>> "$LOG_FILE" > ./pid
ret=$?
[ x`cat ./pid` = x ] && echo 0 > ./pid
if [ $ret -eq 0 ]; then
logex cp -f ./pid "$STAT_PATH/$s"
fi
popd &> /dev/null
rm -rf "$tmpdir"
[ $ret -eq 0 ] && clog "done" || clog "error"
return $ret
}
start () {
local scripts s ret
clog $"Starting $prog: " -n
if [ -n "$DEFAULT_START" -a -z "$OPT_SCRIPTS" ]; then
SCRIPTS="$DEFAULT_START"
fi
if [ -z "$SCRIPTS" ]; then
do_warning $"No scripts exist."
return 5 # program is not installed
fi
prepare_stat_dir
if [ $? -ne 0 ]; then
do_failure $"Failed to make stat directory ($STAT_PATH)"
return 1
fi
prepare_cache_dir
if [ $? -ne 0 ]; then
do_failure $"Failed to make cache directory ($CACHE_PATH)"
return 1
fi
if [ $RECURSIVE -eq 1 ]; then
SCRIPTS=`sort_dependency $SCRIPTS`
if [ $? -ne 0 ]; then
do_failure $"Failed to sort dependency"
return 6 # program is not configured
fi
fi
for s in $SCRIPTS; do
start_script "$s"
ret=$?
if [ $ret -ne 0 ]; then
might_fail $"Failed to run \"$s\". ($ret)"
fi
done
might_success $"$prog startup"
return 0
}
stop_script () { # script
local p
check_running "$1"
ret=$?
[ $ret -eq 1 ] && rm -f "$STAT_PATH/$1"
[ $ret -ne 0 ] && return 0
p=`get_daemon_pid $1`
if [ $p -ne 0 ]; then
logex kill -TERM $p
else
logex $STAPRUN -d "$1"
fi
[ $? -ne 0 ] && return 1
rm -f "$STAT_PATH/$1"
return $?
}
stop () {
local s sl=
clog $"Stopping $prog: " -n
[ -z "$OPT_SCRIPTS" ] && SCRIPTS=`get_all_runnings`
if [ $RECURSIVE -eq 1 ]; then
SCRIPTS=`sort_dependency $SCRIPTS`
if [ $? -ne 0 ]; then
do_failure $"Failed to sort dependency"
return 6 # program is not configured
fi
fi
for s in $SCRIPTS; do
sl="$s $sl"
done
for s in $sl; do
stop_script $s
[ $? -ne 0 ] && might_fail $"Failed to stop \"$s\". "
done
might_success $"$prog stopping "
return 0
}
status () {
local s pid ret r
[ -z "$SCRIPTS" ] && SCRIPTS=`get_all_runnings`
ret=3
if [ -z "$SCRIPTS" ] ; then
echo "No systemtap scripts are present"
return $ret
fi
for s in $SCRIPTS; do
check_running $s
r=$?
[ $ret -ne 0 ] && ret=$r
case $r in
0)
pid=`get_daemon_pid $s`
[ $pid -ne 0 ] && pid="($pid)" || pid=
echo $"$s$pid is running..." ;;
1|3) echo $"$s is stopped" ;;
4) echo $"$s is dead, but another script is running.";;
esac
done
return $ret
}
compile () {
local s ss
clog $"Compiling systemtap scripts: " -n
prepare_cache_dir
if [ $? -ne 0 ]; then
do_failure $"Failed to make cache directory ($CACHE_PATH)"
return 1
fi
for s in $SCRIPTS; do
ss="$ss "`ls "$CACHE_PATH/$s.ko" "$CACHE_PATH/$s.opts" 2> /dev/null`
done
ss=`echo -n $ss`
if [ "$ss" ]; then
clog "Updating caches: $ss"
ask_yesno "Do you really want to update above caches"
[ $? -eq 0 ] && return 0
fi
for s in $SCRIPTS; do
compile_script $s nocheck
[ $? -ne 0 ] && might_fail $"$s compilation failed "
done
might_success $"$prog compiled "
return 0
}
# Cleanup caches
cleanup () {
local s ss ret
clog $"Cleaning up systemtap scripts: " -n
if [ ! -d "$CACHE_PATH" ]; then
do_success "no cache"
return 0
fi
for s in $SCRIPTS; do
ss="$ss "`ls "$CACHE_PATH/$s.ko" "$CACHE_PATH/$s.opts" 2> /dev/null`
done
ss=`echo -n $ss`
if [ "$ss" ]; then
echo "Removing caches: $ss"
ask_yesno "Do you really want to remove above caches"
[ $? -eq 0 ] && return 0
for s in $SCRIPTS; do
logex rm -f "$CACHE_PATH/$s.ko" "$CACHE_PATH/$s.opts"
[ $? -ne 0 ] && might_fail $"failed to clean cache $s.ko"
done
might_success "done"
return 0
fi
}
# Restart scripts
function restart () {
[ -z "$OPT_SCRIPTS" ] && SCRIPTS=`get_all_runnings`
[ "$SCRIPTS" ] && stop
echo
start
return $?
}
RETVAL=0
case $CMD in
start)
start
RETVAL=$?
;;
stop)
stop
RETVAL=$?
;;
restart|force-reload)
restart
RETVAL=$?
;;
status)
status
exit $?
;;
compile)
compile
RETVAL=$?
;;
cleanup)
cleanup
RETVAL=$?
;;
*)
echo_usage
RETVAL=3
;;
esac
echo
exit $RETVAL
|