unload.go

/*
   Copyright 2014 CoreOS, Inc.

   Licensed under the Apache License, Version 2.0 (the "License");
   you may not use this file except in compliance with the License.
   You may obtain a copy of the License at

       http://www.apache.org/licenses/LICENSE-2.0

   Unless required by applicable law or agreed to in writing, software
   distributed under the License is distributed on an "AS IS" BASIS,
   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   See the License for the specific language governing permissions and
   limitations under the License.
*/

package main

import (
	"os"

	"github.com/coreos/fleet/job"
	"github.com/coreos/fleet/log"
)

var (
	cmdUnloadUnit = &Command{
		Name:    "unload",
		Summary: "Unschedule one or more units in the cluster.",
		Usage:   "UNIT...",
		Run:     runUnloadUnit,
	}
)

func init() {
	cmdUnloadUnit.Flags.IntVar(&sharedFlags.BlockAttempts, "block-attempts", 0, "Wait until the units are inactive, performing up to N attempts before giving up. A value of 0 indicates no limit.")
	cmdUnloadUnit.Flags.BoolVar(&sharedFlags.NoBlock, "no-block", false, "Do not wait until the units have become inactive before exiting.")
}

func runUnloadUnit(args []string) (exit int) {
	units, err := findUnits(args)
	if err != nil {
		stderr("%v", err)
		return 1
	}

	wait := make([]string, 0)
	for _, s := range units {
		if !suToGlobal(s) {
			if job.JobState(s.CurrentState) == job.JobStateInactive {
				log.V(1).Infof("Target state of Unit(%s) already %s, skipping.", s.Name, job.JobStateInactive)
				continue
			}
		}

		log.V(1).Infof("Setting target state of Unit(%s) to %s", s.Name, job.JobStateInactive)
		cAPI.SetUnitTargetState(s.Name, string(job.JobStateInactive))
		if suToGlobal(s) {
			stdout("Triggered global unit %s unload", s.Name)
		} else {
			wait = append(wait, s.Name)
		}
	}

	if !sharedFlags.NoBlock {
		errchan := waitForUnitStates(wait, job.JobStateInactive, sharedFlags.BlockAttempts, os.Stdout)
		for err := range errchan {
			stderr("Error waiting for units: %v", err)
			exit = 1
		}
	} else {
		for _, name := range wait {
			stdout("Triggered unit %s unload", name)
		}
	}

	return
}