# Shared init functions used by SysV and systemd init systems

build_ctdb_options () {

    maybe_set () {
	# If the 2nd arg is null then return - don't set anything.
	# Else if the 3rd arg is set and it doesn't match the 2nd arg
	# then return
	[ -z "$2" -o \( -n "$3" -a "$3" != "$2" \) ] && return

	val="$2"
	case "$1" in
	    --*) sep="=" ;;
	    -*)  sep=" " ;;
	esac
	# For these options we're only passing a value-less flag.
	[ -n "$3" ] && {
	    val=""
	    sep=""
	}

	CTDB_OPTIONS="${CTDB_OPTIONS}${CTDB_OPTIONS:+ }${1}${sep}${val}"
    }

    [ -z "$CTDB_RECOVERY_LOCK" ] && {
        echo "No recovery lock specified. Starting CTDB without split brain prevention"
    }
    maybe_set "--reclock"                "$CTDB_RECOVERY_LOCK"

    # build up CTDB_OPTIONS variable from optional parameters
    maybe_set "--logfile"                "$CTDB_LOGFILE"
    maybe_set "--nlist"                  "$CTDB_NODES"
    maybe_set "--socket"                 "$CTDB_SOCKET"
    maybe_set "--public-addresses"       "$CTDB_PUBLIC_ADDRESSES"
    maybe_set "--public-interface"       "$CTDB_PUBLIC_INTERFACE"
    maybe_set "--dbdir"                  "$CTDB_DBDIR"
    maybe_set "--dbdir-persistent"       "$CTDB_DBDIR_PERSISTENT"
    maybe_set "--event-script-dir"       "$CTDB_EVENT_SCRIPT_DIR"
    maybe_set "--transport"              "$CTDB_TRANSPORT"
    maybe_set "-d"                       "$CTDB_DEBUGLEVEL"
    maybe_set "--debug-hung-script"      "$CTDB_DEBUG_HUNG_SCRIPT"
    maybe_set "--notification-script"    "$CTDB_NOTIFY_SCRIPT"
    maybe_set "--start-as-disabled"      "$CTDB_START_AS_DISABLED"    "yes"
    maybe_set "--start-as-stopped "      "$CTDB_START_AS_STOPPED"     "yes"
    maybe_set "--no-recmaster"           "$CTDB_CAPABILITY_RECMASTER" "no"
    maybe_set "--no-lmaster"             "$CTDB_CAPABILITY_LMASTER"   "no"
    maybe_set "--lvs --single-public-ip" "$CTDB_LVS_PUBLIC_IP"
    maybe_set "--script-log-level"       "$CTDB_SCRIPT_LOG_LEVEL"
    maybe_set "--log-ringbuf-size"       "$CTDB_LOG_RINGBUF_SIZE"
    maybe_set "--syslog"                 "$CTDB_SYSLOG"               "yes"
    maybe_set "--max-persistent-check-errors" "$CTDB_MAX_PERSISTENT_CHECK_ERRORS"
}

# Log given message or stdin to either syslog or a CTDB log file
do_log ()
{
    script_log "ctdb.init" "$@"
}

select_tdb_checker ()
{
    # Find the best TDB consistency check available.
    use_tdb_tool_check=false
    if [ -x /usr/bin/tdbtool ] && \
	echo "help" | /usr/bin/tdbtool | grep -q check ; then

	use_tdb_tool_check=true
    elif [ -x /usr/bin/tdbtool -a -x /usr/bin/tdbdump ] ; then
	    do_log <<EOF
WARNING: The installed 'tdbtool' does not offer the 'check' subcommand.
 Using 'tdbdump' for database checks.
 Consider updating 'tdbtool' for better checks!
EOF
    elif [ -x /usr/bin/tdbdump ] ; then
	do_log <<EOF
WARNING: 'tdbtool' is not available.
 Using 'tdbdump' to check the databases.
 Consider installing a recent 'tdbtool' for better checks!
EOF
    else
	do_log <<EOF
WARNING: Cannot check databases since neither
 'tdbdump' nor 'tdbtool check' is available.
 Consider installing tdbtool or at least tdbdump!
EOF
        return 1
    fi
}

check_tdb ()
{
    _db="$1"

    if $use_tdb_tool_check ; then
	# tdbtool always exits with 0  :-(
	if tdbtool "$_db" check 2>/dev/null |
	    grep -q "Database integrity is OK" ; then
	    return 0
	else
	    return 1
	fi
    else
	tdbdump "$_db" >/dev/null 2>/dev/null
	return $?
    fi
}

check_persistent_databases ()
{
    _dir="${CTDB_DBDIR_PERSISTENT:-${CTDB_DBDIR:-/var/ctdb}/persistent}"
    mkdir -p "$_dir" 2>/dev/null

    [ "${CTDB_MAX_PERSISTENT_CHECK_ERRORS:-0}" = "0" ] || return 0

    for _db in $(ls "$_dir/"*.tdb.*[0-9] 2>/dev/null) ; do
	check_tdb $_db || {
	    do_log "Persistent database $_db is corrupted! CTDB will not start."
	    return 1
	}
    done
}

check_non_persistent_databases ()
{
    _dir="${CTDB_DBDIR:-/var/ctdb}"
    mkdir -p "$_dir" 2>/dev/null

    for _db in $(ls "${_dir}/"*.tdb.*[0-9] 2>/dev/null) ; do
	check_tdb $_db || {
	    _backup="${_db}.$(date +'%Y%m%d.%H%M%S.%N').corrupt"
	    do_log <<EOF
WARNING: database ${_db} is corrupted.
 Moving to backup ${_backup} for later analysis.
EOF
	    mv "$_db" "$_backup"

	    # Now remove excess backups
	    ls -td "${_db}."*".corrupt" |
	    tail -n +$((${CTDB_MAX_CORRUPT_DB_BACKUPS:-10} + 1)) |
	    xargs rm -f
	    
	}
    done
}

set_ctdb_variables () {
    # set any tunables from the config file
    set | grep ^CTDB_SET_ | cut -d_ -f3- | 
    while read v; do
	varname=`echo $v | cut -d= -f1`
	value=`echo $v | cut -d= -f2`
	ctdb setvar $varname $value || return 1
	echo "Set $varname to $value"
    done
}

wait_until_ready () {
    _timeout="${1:-10}" # default is 10 seconds

    _count=0
    while ! ctdb ping >/dev/null 2>&1 ; do
	if [ $_count -ge $_timeout ] ; then
	    return 1
	fi
	sleep 1
	_count=$(($_count + 1))
    done
}
