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samba-mirror/ctdb/tools/onnode
Martin Schwenke 0e287127cb ctdb-tools: Improve onnode's ShellCheck credibility
Signed-off-by: Martin Schwenke <martin@meltin.net>
Reviewed-by: Amitay Isaacs <amitay@gmail.com>

Autobuild-User(master): Amitay Isaacs <amitay@samba.org>
Autobuild-Date(master): Thu Jul 16 06:51:47 UTC 2020 on sn-devel-184
2020-07-16 06:51:47 +00:00

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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
}
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