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/usr/sbin/crm_standby is in pacemaker-cli-utils 1.1.14-2ubuntu1.3.

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#!/bin/bash

HELPTEXT="crm_standby - convenience wrapper for crm_attribute

Check, enable or disable standby mode for a cluster node.
Nodes in standby mode may not host cluster resources.

Usage: crm_standby <command> [options]

Commands:
 --help                 Display this text and exit
 --version              Display version information and exit
 -G, --query            Display the current value of standby mode (on/off)
 -v, --update=<value>   Update the value of standby mode (on/off)
 -D, --delete           Let standby mode use default value

Options:
 -V, --verbose          Increase debug output (may be specified multiple times)
 -q, --quiet            Print nothing on stdout except the standby status
 -N, --node=<value>     Operate on the named node instead of the current one
 -l, --lifetime=<value> Until when the setting should take effect (reboot/forever)
 -i, --id=<value>       (Advanced) ID used to identify the XML attribute"

op=""
options=""
lifetime=0
target=$(crm_node -n)

BACKWARD_COMPATIBLE="get-value,attr-value:,delete-attr,uname:,attr-id:"
TEMP=$(getopt -o qDGQVN:U:v:i:l: \
    --long help,version,query,update:,delete,verbose,quiet,node:,lifetime:,id:,$BACKWARD_COMPATIBLE \
    -n 'crm_standby' -- "$@")

if [ $? -ne 0 ]; then
    echo
    echo "$HELPTEXT"
    exit 1
fi

# The quotes around $TEMP are essential!
eval set -- "$TEMP"

while true ; do
    case "$1" in
        -N|--node|-U|--uname)       target="$2"; shift 2;;
        -G|--query|--get-value)     options="$options --query"; op=g; shift;;
        -v|--update|--attr-value)   options="$options --update $2"; op=u; shift 2;;
        -D|--delete|--delete-attr)  options="$options --delete"; op=d; shift;;
        -l|--lifetime)              options="$options --lifetime $2"; lifetime=1; shift 2;;
        -i|--id|--attr-id)          options="$options --id $2"; shift 2;;
        -q|-Q|--quiet|-V|--verbose) options="$options $1"; shift;;
        --version)                  crm_attribute --version; exit 0;;
        --help)                     echo "$HELPTEXT"; exit 0;;
        --)                         shift ; break ;;
        *) echo "crm_standby: unrecognized option '$1'"; echo; echo "$HELPTEXT"; exit 1;;
    esac
done

options="-N $target -n standby $options"
if [ x$op = x ]; then
    options="$options -G"; op=g
fi

# If the user didn't explicitly specify a lifetime ...
if [ $lifetime -eq 0 ]; then
    case $op in
        g)
            # For query, report the forever entry if one exists, otherwise
            # report the reboot entry if one exists, otherwise report off.
            crm_attribute $options -l forever 2>&1 > /dev/null
            if [ $? -eq 0 ]; then
                options="$options -l forever"
            else
                options="$options -l reboot -d off"
            fi
            ;;
        u)
            # For update, default to updating the forever entry.
            options="$options -l forever"
            ;;
        d)
            # For delete, default to deleting both forever and reboot entries.
            crm_attribute $options -l forever
            crm_attribute $options -l reboot
            exit 0
            ;;
    esac
fi

crm_attribute $options