#!/bin/bash

# Install abrt coredump hook

#

# chkconfig: 35 82 16

# description: Installs coredump handler which saves segfault data

### BEGIN INIT INFO

# Provides: abrt-ccpp

# Required-Start: $abrtd

# Default-Stop: 0 1 2 6

# Default-Start: 3 5

# Short-Description: Installs coredump handler which saves segfault data

# Description: Installs coredump handler which saves segfault data

### END INIT INFO

# Source function library.

. /etc/rc.d/init.d/functions

# For debugging

dry_run=false

verbose=false

# We don't have pid files, therefore have to use

# a flag file in /var/lock/subsys to enable GUI service tools

# to figure out our status

LOCK="/var/lock/subsys/abrt-ccpp"

PATTERN_FILE="/proc/sys/kernel/core_pattern"

SAVED_PATTERN_FILE="/var/run/abrt/saved_core_pattern"

HOOK_BIN="/usr/libexec/abrt-hook-ccpp"

PATTERN="|$HOOK_BIN %s %c %p %u %g %t %h %e"

# core_pipe_limit specifies how many dump_helpers can run at the same time

# 0 - means unlimited, but it's not guaranteed that /proc/<pid> of crashing

#     process will be available for dump_helper.

# 4 - means that 4 dump_helpers can run at the same time (the rest will also

#     run, but they will fail to read /proc/<pid>).

#

# This should be enough for ABRT, we can miss some crashes, but what are

# the odds that more processes crash at the same time? And moreover,

# do people want to save EVERY ONE of the crashes when they have

# a crash storm? I don't think so.

# The value of 4 has been recommended by nhorman.

#

CORE_PIPE_LIMIT_FILE="/proc/sys/kernel/core_pipe_limit"

CORE_PIPE_LIMIT="4"

RETVAL=0

check() {

	# Check that we're a privileged user

	[ "`id -u`" = 0 ] || exit 4

}

start() {

	check

	cur=`cat "$PATTERN_FILE"`

	cur_first=`printf "%s" "$cur" | sed 's/ .*//'`

	$verbose && printf "cur:'%s'\n" "$cur"

	# Is it already installed?

	if test x"$cur_first" != x"|$HOOK_BIN"; then   # no

		# It is not installed

		printf "%s\n" "$cur" >"$SAVED_PATTERN_FILE"

		OLD_PATTERN=""

		# Does old pattern start with '|'?

		if test x"${cur#|}" = x"$cur"; then   # no

			# Encode it as hex string, NUL terminated

			OLD_PATTERN=`printf "%s" "$cur" | od -tx1 | sed 's/000[^ ]*//' | xargs | sed 's/ //g'`

			$verbose && printf "OLD_PATTERN:'%s'\n" "$OLD_PATTERN"

			OLD_PATTERN=" ${OLD_PATTERN}00"

		fi

		# Install new handler

		$verbose && printf "Installing to %s:'%s'\n" "$PATTERN_FILE" "${PATTERN}${OLD_PATTERN}"

		$dry_run || echo "${PATTERN}${OLD_PATTERN}" >"$PATTERN_FILE"

		$dry_run || touch -- "$LOCK"

		# Check core_pipe_limit and change it if it's 0,

		# otherwise the abrt-hook-ccpp won't be able to read /proc/<pid>

		# of the crashing process

		if test x"`cat "$CORE_PIPE_LIMIT_FILE"`" = x"0"; then

			echo "$CORE_PIPE_LIMIT" >"$CORE_PIPE_LIMIT_FILE"

		fi

	fi

	return $RETVAL

}

stop() {

	check

	if test -f "$SAVED_PATTERN_FILE"; then

		$verbose && printf "Restoring to %s:'%s'\n" "$PATTERN_FILE" "`cat "$SAVED_PATTERN_FILE"`"

		$dry_run || cat "$SAVED_PATTERN_FILE" >"$PATTERN_FILE"

	fi

	$dry_run || rm -f -- "$LOCK"

	return $RETVAL

}

restart() {

	stop

	start

}

reload() {

	restart

}

case "$1" in

start)

	start

	;;

stop)

	stop

	;;

reload)

	reload

	;;

force-reload)

	echo "$0: Unimplemented feature."

	RETVAL=3

	;;

restart)

	restart

	;;

condrestart)

	cur=`cat "$PATTERN_FILE"`

	cur_first=`printf "%s" "$cur" | sed 's/ .*//'`

	# Is it already installed?

	if test x"$cur_first" = x"|$HOOK_BIN"; then   # yes

		$verbose && printf "Installed, re-installing\n"

		restart

	fi

	;;

status)

	cur=`cat "$PATTERN_FILE"`

	cur_first=`printf "%s" "$cur" | sed 's/ .*//'`

	# Is it already installed?

	if test x"$cur_first" = x"|$HOOK_BIN"; then   # yes

		$verbose && printf "Installed\n"

		RETVAL=0

	else

		$verbose && printf "Not installed\n"

		RETVAL=3  # "stopped normally"

	fi

	;;

*)

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

	RETVAL=2

esac

exit $RETVAL