Target

#!/bin/sh
#
# Target
#      Description: Manages a Lustre target on a shared storage medium.
#
# usage: ./Target {start|stop|status|monitor|validate-all|meta-data}
#
#      OCF parameters are as below:
#        OCF_RESKEY_target
#
# OCF_RESKEY_target : name of the target the chroma-agent should operate on

: ${OCF_FUNCTIONS_DIR=${OCF_ROOT}/resource.d/heartbeat}
. ${OCF_FUNCTIONS_DIR}/.ocf-shellfuncs

usage() {
    echo "usage: $0 {start|stop|status|monitor|meta-data}"
}

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

<longdesc lang="en">
Resource script for a Chroma-managed Lustre Target.
</longdesc>

<shortdesc lang="en">Manages Chroma-managed Lustre Targets</shortdesc>

<parameters>
<parameter name="target" required="1">
<longdesc lang="en">
The name of the target.
</longdesc>
<shortdesc lang="en">target</shortdesc>
<content type="string" default="" />
</parameter>

</parameters>

<actions>
<action name="start" timeout="60" />
<action name="stop" timeout="60" />
<action name="notify" timeout="60" />
<action name="monitor" depth="0" timeout="40" interval="20" />
<action name="validate-all" timeout="5" />
<action name="meta-data" timeout="5" />
</actions>
</resource-agent>
END
}

dbg() {
    # shellcheck disable=SC2102
    echo "$(date +[%d/%b/%Y:%H:%M:%S]) RA $1" >> /var/log/chroma-agent.log
}

Target_start() {
    dbg "Target_start()"
    # See if the device is already mounted.
    if Target_status >/dev/null 2>&1; then
        # ocf_log info "Target $TARGET is already started."
        dbg "Target $TARGET is already started."
        return $OCF_SUCCESS
    fi

    if ! grep -e 'lustre$' /proc/filesystems >/dev/null; then
        # ocf_log err "Couldn't find the lustre module in /proc/filesystems"
        dbg "Couldn't find the lustre module in /proc/filesystems"
        return $OCF_ERR_ARGS
    fi

    # start the target
    dbg "Starting: chroma-agent mount_target --uuid $TARGET --pacemaker_ha_operation 1"
    if ! chroma-agent mount_target --uuid $TARGET --pacemaker_ha_operation 1; then
        # ocf_log err "Couldn't start target $TARGET"
        dbg "Couldn't start target $TARGET"
        return $OCF_ERR_GENERIC
    fi
    dbg "Leaving Target_start() with success"
    return $OCF_SUCCESS
}

Target_notify() {
    dbg "Target_notify()"
    return $OCF_SUCCESS
}

Target_stop() {
    dbg "Target_stop()"
    # started already?
    Target_status >/dev/null 2>&1
    if [ $? -eq $OCF_NOT_RUNNING ]; then
        # woo!  nothing to do.
        rc=$OCF_SUCCESS
    else
        dbg "Unmounting: chroma-agent unmount_target --uuid $TARGET"
        chroma-agent unmount_target --uuid $TARGET
    fi

    return $rc
}

Target_status() {
    # call the agent to see if it's running
    if chroma-agent target_running --uuid $TARGET >/dev/null 2>&1; then
        rc=$OCF_SUCCESS
        msg="$TARGET is started (running)"
    else
        rc=$OCF_NOT_RUNNING
        msg="$TARGET is stopped"
    fi

    if [ "$OP" = "status" ]; then
        dbg "$msg"
    #    ocf_log info "$msg"
    fi

    return $rc
}

Target_validate_all() {
    dbg "Target_validate_all()"
    return $OCF_SUCCESS
}

if [ $# -ne 1 ]; then
    usage
    exit $OCF_ERR_ARGS
fi

TARGET=$OCF_RESKEY_target
OP=$1

# These operations do not require instance parameters
case $OP in
meta-data)    meta_data
              exit $OCF_SUCCESS
              ;;
usage)        usage
              exit $OCF_SUCCESS
              ;;
status)       Target_status
              exit $?
              ;;
monitor)      Target_status
              exit $?
              ;;
validate-all) Target_validate_all
              exit $?
              ;;
stop)         Target_stop
              exit $?
              ;;
start)        Target_start
              ;;
*)            usage
              exit $OCF_ERR_UNIMPLEMENTED
              ;;
esac
exit $?