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-rwxr-xr-xctdb/tools/onnode344
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+#!/usr/bin/env bash
+
+# Run commands on CTDB nodes.
+
+# See http://ctdb.samba.org/ for more information about CTDB.
+
+# Copyright (C) Martin Schwenke 2008
+
+# Based on an earlier script by Andrew Tridgell and Ronnie Sahlberg.
+
+# Copyright (C) Andrew Tridgell 2007
+
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 3 of the License, or
+# (at your option) any later version.
+
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU General Public License for more details.
+
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, see <http://www.gnu.org/licenses/>.
+
+prog=$(basename "$0")
+
+usage ()
+{
+ cat >&2 <<EOF
+Usage: onnode [OPTION] ... <NODES> <COMMAND> ...
+ options:
+ -c Run in current working directory on specified nodes.
+ -f Specify nodes file, overriding default.
+ -i Keep standard input open - the default is to close it.
+ -n Allow nodes to be specified by name.
+ -p Run command in parallel on specified nodes.
+ -P Push given files to nodes instead of running commands.
+ -q Do not print node addresses (overrides -v).
+ -v Print node address even for a single node.
+ <NODES> "all", "any", "ok" (or "healthy"), "con" (or "connected") ; or
+ a node number (0 base); or
+ a hostname (if -n is specified); or
+ list (comma separated) of <NODES>; or
+ range (hyphen separated) of node numbers.
+EOF
+ exit 1
+
+}
+
+invalid_nodespec ()
+{
+ echo "Invalid <nodespec>" >&2 ; echo >&2
+ usage
+}
+
+# Defaults.
+current=false
+ctdb_nodes_file=""
+parallel=false
+verbose=false
+quiet=false
+names_ok=false
+push=false
+stdin=false
+
+if [ -z "$CTDB_BASE" ] ; then
+ CTDB_BASE="/usr/local/etc/ctdb"
+fi
+
+parse_options ()
+{
+ local opt
+
+ while getopts "cf:hnpqvPi?" opt ; do
+ case "$opt" in
+ c) current=true ;;
+ f) ctdb_nodes_file="$OPTARG" ;;
+ n) names_ok=true ;;
+ p) parallel=true ;;
+ q) quiet=true ;;
+ v) verbose=true ;;
+ P) push=true ;;
+ i) stdin=true ;;
+ \?|h) usage ;;
+ esac
+ done
+ shift $((OPTIND - 1))
+
+ if [ $# -lt 2 ] ; then
+ usage
+ fi
+
+ nodespec="$1" ; shift
+ command="$*"
+}
+
+echo_nth ()
+{
+ local n="$1" ; shift
+
+ # Note that this is 0-based
+ local node=""
+ if [ "$n" -le $# ] ; then
+ shift "$n"
+ node="$1"
+ fi
+
+ if [ -n "$node" ] && [ "$node" != "#DEAD" ] ; then
+ echo "$node"
+ else
+ echo "${prog}: \"node ${n}\" does not exist" >&2
+ exit 1
+ fi
+}
+
+parse_nodespec ()
+{
+ # Subshell avoids hacks to restore $IFS.
+ (
+ IFS=","
+ for i in $1 ; do
+ case "$i" in
+ *-*) seq "${i%-*}" "${i#*-}" 2>/dev/null || invalid_nodespec ;;
+ all|any|ok|healthy|con|connected) echo "$i" ;;
+ *)
+ [ "$i" -gt -1 ] 2>/dev/null || $names_ok || invalid_nodespec
+ echo "$i"
+ esac
+ done
+ )
+}
+
+ctdb_status_output="" # cache
+get_nodes_with_status ()
+{
+ local all_nodes="$1"
+ local status="$2"
+
+ if [ -z "$ctdb_status_output" ] ; then
+ ctdb_status_output=$(ctdb -X status 2>&1)
+ # No! Checking the exit code afterwards is actually clearer...
+ # shellcheck disable=SC2181
+ if [ $? -ne 0 ] ; then
+ echo "${prog}: unable to get status of CTDB nodes" >&2
+ echo "$ctdb_status_output" >&2
+ exit 1
+ fi
+ local nl="
+"
+ ctdb_status_output="${ctdb_status_output#*"${nl}"}"
+ fi
+
+ (
+ local i
+ IFS="${IFS}|"
+ while IFS="" read -r i ; do
+
+ # Intentional word splitting
+ # shellcheck disable=SC2086
+ set -- $i # split line on colons
+ shift # line starts with : so 1st field is empty
+ local pnn="$1" ; shift
+ shift # ignore IP address but need status bits below
+
+ case "$status" in
+ healthy)
+ # If any bit is 1, don't match this address.
+ local s
+ for s ; do
+ [ "$s" != "1" ] || continue 2
+ done
+ ;;
+ connected)
+ # If disconnected bit is not 0, don't match this address.
+ [ "$1" = "0" ] || continue
+ ;;
+ *)
+ invalid_nodespec
+ esac
+
+ # Intentional multi-word expansion
+ # shellcheck disable=SC2086
+ echo_nth "$pnn" $all_nodes
+ done <<<"$ctdb_status_output"
+ )
+}
+
+get_any_available_node ()
+{
+ local all_nodes="$1"
+
+ # We do a recursive onnode to find which nodes are up and running.
+ local out line
+ out=$("$0" -pq all ctdb pnn 2>&1)
+ while read -r line ; do
+ if [[ "$line" =~ ^[0-9]+$ ]] ; then
+ local pnn="$line"
+ # Intentional multi-word expansion
+ # shellcheck disable=SC2086
+ echo_nth "$pnn" $all_nodes
+ return 0
+ fi
+ # Else must be an error message from a down node.
+ done <<<"$out"
+ return 1
+}
+
+get_nodes ()
+{
+ local all_nodes
+
+ local f="${CTDB_BASE}/nodes"
+ if [ -n "$ctdb_nodes_file" ] ; then
+ f="$ctdb_nodes_file"
+ if [ ! -e "$f" ] && [ "${f#/}" = "$f" ] ; then
+ # $f is relative, try in $CTDB_BASE
+ f="${CTDB_BASE}/${f}"
+ fi
+ fi
+
+ if [ ! -r "$f" ] ; then
+ echo "${prog}: unable to open nodes file \"${f}\"" >&2
+ exit 1
+ fi
+
+ all_nodes=$(sed -e 's@#.*@@g' -e 's@ *@@g' -e 's@^$@#DEAD@' "$f")
+
+ local n nodes
+ nodes=$(parse_nodespec "$1") || exit $?
+ for n in $nodes ; do
+ case "$n" in
+ all)
+ echo "${all_nodes//#DEAD/}"
+ ;;
+ any)
+ get_any_available_node "$all_nodes" || exit 1
+ ;;
+ ok|healthy)
+ get_nodes_with_status "$all_nodes" "healthy" || exit 1
+ ;;
+ con|connected)
+ get_nodes_with_status "$all_nodes" "connected" || exit 1
+ ;;
+ [0-9]|[0-9][0-9]|[0-9][0-9][0-9])
+ # Intentional multi-word expansion
+ # shellcheck disable=SC2086
+ echo_nth "$n" $all_nodes
+ ;;
+ *)
+ $names_ok || invalid_nodespec
+ echo "$n"
+ esac
+ done
+}
+
+# shellcheck disable=SC2317
+# push() called indirectly via $ONNODE_SSH
+push ()
+{
+ local host="$1"
+ local files="$2"
+
+ local f
+ for f in $files ; do
+ $verbose && echo "Pushing $f"
+ case "$f" in
+ /*) rsync "$f" "[${host}]:${f}" ;;
+ *) rsync "${PWD}/${f}" "[${host}]:${PWD}/${f}" ;;
+ esac
+ done
+}
+
+######################################################################
+
+parse_options "$@"
+
+ssh_opts=
+if $push ; then
+ if [ -n "$ONNODE_SSH" ] ; then
+ export RSYNC_RSH="$ONNODE_SSH"
+ fi
+ ONNODE_SSH=push
+else
+ $current && command="cd $PWD && $command"
+
+ # Could "2>/dev/null || true" but want to see errors from typos in file.
+ [ -r "${CTDB_BASE}/onnode.conf" ] && . "${CTDB_BASE}/onnode.conf"
+ [ -n "$ONNODE_SSH" ] || ONNODE_SSH=ssh
+ # $ONNODE_SSH must accept the -n option - it can be ignored!
+ if $parallel || ! $stdin ; then
+ ssh_opts="-n"
+ fi
+fi
+
+######################################################################
+
+nodes=$(get_nodes "$nodespec") || exit $?
+
+if $quiet ; then
+ verbose=false
+else
+ # If $nodes contains a space or a newline then assume multiple nodes.
+ nl="
+"
+ [ "$nodes" != "${nodes%[ "${nl}"]*}" ] && verbose=true
+fi
+
+pids=""
+# Intentional multi-word expansion
+# shellcheck disable=SC2086
+trap 'kill -TERM $pids 2>/dev/null' INT TERM
+# There's a small race here where the kill can fail if no processes
+# have been added to $pids and the script is interrupted. However,
+# the part of the window where it matter is very small.
+retcode=0
+for n in $nodes ; do
+ set -o pipefail 2>/dev/null
+
+ ssh_cmd="$ONNODE_SSH $ssh_opts"
+ if $parallel ; then
+ if $verbose ; then
+ $ssh_cmd "$n" "$command" 2>&1 | sed -e "s@^@[$n] @"
+ else
+ $ssh_cmd "$n" "$command"
+ fi &
+ pids="${pids} $!"
+ else
+ if $verbose ; then
+ echo >&2 ; echo ">> NODE: $n <<" >&2
+ fi
+ {
+ $ssh_cmd "$n" "$command"
+ } || retcode=$?
+ fi
+done
+
+if $parallel ; then
+ for p in $pids; do
+ wait "$p" || retcode=$?
+ done
+fi
+
+exit $retcode