1 files changed, 107 insertions, 0 deletions
diff --git a/src/hooks/abrt-install-ccpp-hook.in b/src/hooks/abrt-install-ccpp-hook.in
new file mode 100755
index 00000000..a245aa28
--- /dev/null
+++ b/src/hooks/abrt-install-ccpp-hook.in
@@ -0,0 +1,107 @@
+#!/bin/bash
+# Install coredump handler which saves segfault data
+
+# For debugging
+
+dry_run=false
+verbose=false
+
+DEFAULT_LOCATION=/var/spool/abrt
+
+DUMP_LOCATION=`cat /etc/abrt/abrt.conf | grep '^[ 	]*DumpLocation'`
+DUMP_LOCATION=${DUMP_LOCATION#*DumpLocation*=}
+DUMP_LOCATION=${DUMP_LOCATION// /}
+
+if [ "$DUMP_LOCATION" = "" ]; then
+    DUMP_LOCATION=$DEFAULT_LOCATION
+fi
+
+PATTERN_FILE="/proc/sys/kernel/core_pattern"
+SAVED_PATTERN_DIR="/var/run/abrt"
+SAVED_PATTERN_FILE="/var/run/abrt/saved_core_pattern"
+HOOK_BIN="/usr/libexec/abrt-hook-ccpp"
+# Must match percent_specifiers[] order in abrt-hook-ccpp.c:
+PATTERN="|$HOOK_BIN $DUMP_LOCATION %s %c %p %u %g %t %e"
+# Same, but with bogus "executable name" parameter
+PATTERN1="|$HOOK_BIN $DUMP_LOCATION %s %c %p %u %g %t e"
+
+# core_pipe_limit specifies how many dump_helpers can run at the same time
+# 0 - means unlimited, but it's not guaranteed that /proc/<pid> of crashing
+#     process will be available for dump_helper.
+# 4 - means that 4 dump_helpers can run at the same time (the rest will also
+#     run, but they will fail to read /proc/<pid>).
+#
+# This should be enough for ABRT, we can miss some crashes, but what are
+# the odds that more processes crash at the same time? And moreover,
+# do people want to save EVERY ONE of the crashes when they have
+# a crash storm? I don't think so.
+# The value of 4 has been recommended by nhorman.
+#
+CORE_PIPE_LIMIT_FILE="/proc/sys/kernel/core_pipe_limit"
+CORE_PIPE_LIMIT="4"
+
+start() {
+	cur=`cat "$PATTERN_FILE"`
+	cur_first=`printf "%s" "$cur" | sed 's/ .*//'`
+
+	# Is there a %e (executable name) in old pattern anywhere?
+	if test x"${cur#.*%e}" = x"${cur}"; then
+		# No. Can use PATTERN with less risk of overflow
+		# on expansion (executable names can be LONG).
+		# Overflow would cause kernel to abort coredump. BAD.
+		PATTERN="$PATTERN1"
+	fi
+
+	$verbose && printf "cur:'%s'\n" "$cur"
+	# Is it already installed?
+	if test x"$cur_first" != x"|$HOOK_BIN"; then   # no
+		# It is not installed
+		mkdir -p -- "$SAVED_PATTERN_DIR"
+		printf "%s\n" "$cur" >"$SAVED_PATTERN_FILE"
+		# Install new handler
+		$verbose && printf "Installing to %s:'%s'\n" "$PATTERN_FILE" "$PATTERN"
+		$dry_run || echo "$PATTERN" >"$PATTERN_FILE"
+
+		# Check core_pipe_limit and change it if it's 0,
+		# otherwise the abrt-hook-ccpp won't be able to read /proc/<pid>
+		# of the crashing process
+		if test x"`cat "$CORE_PIPE_LIMIT_FILE"`" = x"0"; then
+			echo "$CORE_PIPE_LIMIT" >"$CORE_PIPE_LIMIT_FILE"
+		fi
+	fi
+}
+
+stop() {
+	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" >"$PATTERN_FILE"
+	fi
+}
+
+status() {
+	cur=`cat "$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"
+		return 0
+	else
+		$verbose && printf "Not installed\n"
+		return 1
+	fi
+}
+
+case "$1" in
+install)
+	start
+	;;
+uninstall)
+	stop
+	;;
+is-installed)
+	status
+	;;
+*)
+	echo $"Usage: $0 {install|uninstall|is-installed}"
+	return 2
+esac