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#!/bin/sh
# 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 all nodes.
-p Run command in parallel on specified nodes.
-q Do not print node addresses (overrides -v).
-v Print node address even for a single node.
<NODES> "all" or a node number (0 base); 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
parallel=false
verbose=false
quiet=false
parse_options ()
{
# $POSIXLY_CORRECT means that the command passed to onnode can
# take options and getopt won't reorder things to make them
# options ot onnode.
temp=$(POSIXLY_CORRECT=1 getopt -n "$prog" -o "chpqv" -l help -- "$@")
[ $? != 0 ] && usage
eval set -- "$temp"
while true ; do
case "$1" in
-c) current=true ; shift ;;
-p) parallel=true ; shift ;;
-q) quiet=true ; shift ;;
-v) verbose=true ; shift ;;
--) shift ; break ;;
-h|--help|*) usage ;; # Shouldn't happen, so this is reasonable.
esac
done
[ $# -lt 2 ] && usage
nodespec="$1" ; shift
command="$@"
}
# Can probably be avoided if we use bash?
get_nth ()
{
n="$1" ; shift
c=0
for j ; do
if [ $n -eq $c ] ; then
echo $j
break
fi
c=$(($c + 1))
done
}
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) echo all ;;
*)
[ $i -gt -1 ] 2>/dev/null || invalid_nodespec
echo $i
esac
done
)
}
get_nodes ()
{
[ -f "$CTDB_NODES_FILE" ] || CTDB_NODES_FILE=/etc/ctdb/nodes
all_nodes=$(egrep '^[[:alnum:]]' $CTDB_NODES_FILE)
nodes=""
for n in $(parse_nodespec "$1") ; do
[ $? != 0 ] && exit 1 # Required to catch exit in above subshell.
case "$n" in
all) echo $all_nodes ;;
*) node=$(get_nth $n $all_nodes)
if [ -n "$node" ] ; then
echo $node
else
echo "${prog}: \"node ${n}\" does not exist" >&2
exit 1
fi
esac
done
}
######################################################################
parse_options "$@"
$current && command="cd $PWD && $command"
SSH_OPTS=
# Could "2>/dev/null || true" but want to see errors from typos in file.
[ -r /etc/ctdb/onnode.conf ] && . /etc/ctdb/onnode.conf
[ -n "$SSH" ] || SSH=ssh
if [ "$SSH" = "ssh" ] ; then
ssh_opts="-n"
else
: # rsh? All bets are off!
fi
######################################################################
nodes=$(get_nodes "$nodespec")
[ $? != 0 ] && exit 1 # Required to catch exit in above subshell.
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=""
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.
for n in $nodes ; do
if $parallel ; then
if $verbose ; then
($SSH $ssh_opts $EXTRA_SSH_OPTS $n "$command" 2>&1 | sed -e "s@^@[$n] @" )&
else
$SSH $ssh_opts $EXTRA_SSH_OPTS $n "$command" &
fi
pids="${pids} $!"
else
if $verbose ; then
echo >&2 ; echo ">> NODE: $n <<" >&2
fi
$SSH $ssh_opts $EXTRA_SSH_OPTS $n "$command"
fi
done
$parallel && wait
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