pacemaker/extra/resources/Dummy

#!/bin/sh
#
#
# Dummy OCF RA. Does nothing but wait a few seconds, can be
# configured to fail occassionally.
#
# Copyright (c) 2004 SUSE LINUX AG, Lars Marowsky-Brée
#                    All Rights Reserved.
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of version 2 of the GNU General Public License as
# published by the Free Software Foundation.
#
# This program is distributed in the hope that it would be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
#
# Further, this software is distributed without any warranty that it is
# free of the rightful claim of any third person regarding infringement
# or the like.  Any license provided herein, whether implied or
# otherwise, applies only to this software file.  Patent licenses, if
# any, provided herein do not apply to combinations of this program with
# other software, or any other product whatsoever.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write the Free Software Foundation,
# Inc., 59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
#

#######################################################################
# Initialization:

: ${OCF_FUNCTIONS=${OCF_ROOT}/resource.d/heartbeat/.ocf-shellfuncs}
. ${OCF_FUNCTIONS}
: ${__OCF_ACTION=$1}

#######################################################################

meta_data() {
    cat <<END
<?xml version="1.0"?>
<!DOCTYPE resource-agent SYSTEM "ra-api-1.dtd">
<resource-agent name="Dummy" version="1.0">
<version>1.0</version>

<longdesc lang="en">
This is a Dummy Resource Agent. It does absolutely nothing except 
keep track of whether its running or not.
Its purpose in life is for testing and to serve as a template for RA writers.

NB: Please pay attention to the timeouts specified in the actions
section below. They should be meaningful for the kind of resource
the agent manages. They should be the minimum advised timeouts,
but they shouldn't/cannot cover _all_ possible resource
instances. So, try to be neither overly generous nor too stingy,
but moderate. The minimum timeouts should never be below 10 seconds.
</longdesc>
<shortdesc lang="en">Example stateless resource agent</shortdesc>

<parameters>
<parameter name="state" unique="1">
<longdesc lang="en">
Location to store the resource state in.
</longdesc>
<shortdesc lang="en">State file</shortdesc>
<content type="string" default="${HA_VARRUN%%/}/Dummy-${OCF_RESOURCE_INSTANCE}.state" />
</parameter>

<parameter name="passwd" unique="1">
<longdesc lang="en">
Fake password field
</longdesc>
<shortdesc lang="en">Password</shortdesc>
<content type="string" default="" />
</parameter>

<parameter name="fake" unique="0">
<longdesc lang="en">
Fake attribute that can be changed to cause a reload
</longdesc>
<shortdesc lang="en">Fake attribute that can be changed to cause a reload</shortdesc>
<content type="string" default="dummy" />
</parameter>

<parameter name="op_sleep" unique="1">
<longdesc lang="en">
Number of seconds to sleep during operations.  This can be used to test how
the cluster reacts to operation timeouts.
</longdesc>
<shortdesc lang="en">Operation sleep duration in seconds.</shortdesc>
<content type="string" default="0" />
</parameter>

<parameter name="fail_start_on" unique="0">
<longdesc lang="en">
Start actions will return failure if running on the host specified here, but
the resource will start successfully anyway (future monitor calls will find it
running). This can be used to test on-fail=ignore.
</longdesc>
<shortdesc lang="en">Report bogus start failure on specified host</shortdesc>
<content type="string" default="" />
</parameter>

<parameter name="envfile" unique="1">
<longdesc lang="en">
If this is set, the environment will be dumped to this file for every call.
</longdesc>
<shortdesc lang="en">Environment dump file</shortdesc>
<content type="string" default="" />
</parameter>

</parameters>

<actions>
<action name="start"        timeout="20" />
<action name="stop"         timeout="20" />
<action name="monitor"      timeout="20" interval="10" depth="0"/>
<action name="reload"       timeout="20" />
<action name="migrate_to"   timeout="20" />
<action name="migrate_from" timeout="20" />
<action name="validate-all" timeout="20" />
<action name="meta-data"    timeout="5" />
</actions>
</resource-agent>
END
}

#######################################################################

# don't exit on TERM, to test that lrmd makes sure that we do exit
trap sigterm_handler TERM
sigterm_handler() {
    ocf_log info "They use TERM to bring us down. No such luck."
    return
}

dummy_usage() {
    cat <<END
usage: $0 {start|stop|monitor|migrate_to|migrate_from|validate-all|meta-data}

Expects to have a fully populated OCF RA-compliant environment set.
END
}

dump_env() {
    if [ "${OCF_RESKEY_envfile}" != "" ]; then
            echo "### ${__OCF_ACTION} @ $(date) ###
$(env | sort)
###" >> "${OCF_RESKEY_envfile}"
    fi
}

dummy_start() {
    local RETVAL

    dummy_monitor

    RETVAL=$?
    if [ $RETVAL -eq $OCF_SUCCESS ]; then
        if [ "$(uname -n)" = "${OCF_RESKEY_fail_start_on}" ]; then
            RETVAL=$OCF_ERR_GENERIC
        fi
        return $RETVAL
    fi

    touch "${OCF_RESKEY_state}"
    RETVAL=$?
    if [ "$(uname -n)" = "${OCF_RESKEY_fail_start_on}" ]; then
        RETVAL=$OCF_ERR_GENERIC
    fi
    return $RETVAL
}

dummy_stop() {
    dummy_monitor --force
    if [ $? -eq $OCF_SUCCESS ]; then
        rm ${OCF_RESKEY_state}
    fi
    rm -f "${VERIFY_SERIALIZED_FILE}"
    return $OCF_SUCCESS
}

dummy_monitor() {
    # Monitor _MUST!_ differentiate correctly between running
    # (SUCCESS), failed (ERROR) or _cleanly_ stopped (NOT RUNNING).
    # That is THREE states, not just yes/no.

    if [ $OCF_RESKEY_op_sleep -ne 0 ]; then
        if [ "$1" = "" -a -f "${VERIFY_SERIALIZED_FILE}" ]; then
            # two monitor ops have occurred at the same time.
            # this is to verify a condition in the lrmd regression tests.
            ocf_log err "$VERIFY_SERIALIZED_FILE exists already"
            return $OCF_ERR_GENERIC
        fi

        touch "${VERIFY_SERIALIZED_FILE}"
        sleep ${OCF_RESKEY_op_sleep}
        rm "${VERIFY_SERIALIZED_FILE}"
    fi
    
    if [ -f "${OCF_RESKEY_state}" ]; then
        # Multiple monitor levels are defined to support various tests
        case "$OCF_CHECK_LEVEL" in
            10)
            # monitor level with delay, useful for testing timeouts
            sleep 30
            ;;

            20)
            # monitor level that fails intermittently
            n=$(expr $(dd if=/dev/urandom bs=1 count=1 2>/dev/null | od | head -1 | cut -f2 -d' ') % 5)
            if [ $n -eq 1 ]; then
                ocf_exit_reason "smoke detected near CPU fan"
                return $OCF_ERR_GENERIC
            fi
            ;;

            30)
            # monitor level that always fails
            ocf_exit_reason "hyperdrive quota reached"
            return $OCF_ERR_GENERIC
            ;;

            *)
            ;;
        esac
        return $OCF_SUCCESS
    fi
    return $OCF_NOT_RUNNING
}

dummy_validate() {
    
    # Is the state directory writable? 
    state_dir=`dirname "$OCF_RESKEY_state"`
    touch "$state_dir/$$"
    if [ $? -ne 0 ]; then
        return $OCF_ERR_ARGS
    fi
    rm "$state_dir/$$"

    return $OCF_SUCCESS
}

: ${OCF_RESKEY_fake=dummy}
: ${OCF_RESKEY_op_sleep=0}
: ${OCF_RESKEY_CRM_meta_interval=0}
: ${OCF_RESKEY_CRM_meta_globally_unique:="false"}

if [ -z "$OCF_RESKEY_state" ]; then
    OCF_RESKEY_state="${HA_VARRUN%%/}/Dummy-${OCF_RESOURCE_INSTANCE}.state"

    if [ ${OCF_RESKEY_CRM_meta_globally_unique} = "false" ]; then
        # Strip off the trailing clone marker (note + is not portable in sed)
        OCF_RESKEY_state=`echo $OCF_RESKEY_state | sed s/:[0-9][0-9]*\.state/.state/`
    fi
fi
VERIFY_SERIALIZED_FILE="${OCF_RESKEY_state}.serialized"

dump_env

case $__OCF_ACTION in
meta-data)      meta_data
                exit $OCF_SUCCESS
                ;;
start)          dummy_start;;
stop)           dummy_stop;;
monitor)        dummy_monitor;;
migrate_to)     ocf_log info "Migrating ${OCF_RESOURCE_INSTANCE} to ${OCF_RESKEY_CRM_meta_migrate_target}."
                dummy_stop
                ;;
migrate_from)   ocf_log info "Migrating ${OCF_RESOURCE_INSTANCE} from ${OCF_RESKEY_CRM_meta_migrate_source}."
                dummy_start
                ;;
reload)         ocf_log err "Reloading..."
                dummy_start
                ;;
validate-all)   dummy_validate;;
usage|help)     dummy_usage
                exit $OCF_SUCCESS
                ;;
*)              dummy_usage
                exit $OCF_ERR_UNIMPLEMENTED
                ;;
esac
rc=$?
ocf_log debug "${OCF_RESOURCE_INSTANCE} $__OCF_ACTION : $rc"
exit $rc