pause.go

Documentation: k8s.io/kubernetes/test/images/agnhost/pause

     1  /*
     2  Copyright 2019 The Kubernetes Authors.
     3  
     4  Licensed under the Apache License, Version 2.0 (the "License");
     5  you may not use this file except in compliance with the License.
     6  You may obtain a copy of the License at
     7  
     8      http://www.apache.org/licenses/LICENSE-2.0
     9  
    10  Unless required by applicable law or agreed to in writing, software
    11  distributed under the License is distributed on an "AS IS" BASIS,
    12  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    13  See the License for the specific language governing permissions and
    14  limitations under the License.
    15  */
    16  
    17  package pause
    18  
    19  import (
    20  	"fmt"
    21  	"os"
    22  	"os/signal"
    23  	"syscall"
    24  
    25  	"github.com/spf13/cobra"
    26  )
    27  
    28  // CmdPause is used by agnhost Cobra.
    29  var CmdPause = &cobra.Command{
    30  	Use:   "pause",
    31  	Short: "Pauses the execution",
    32  	Long:  `Pauses the execution. Useful for keeping the containers running, so other commands can be executed.`,
    33  	Args:  cobra.MaximumNArgs(0),
    34  	Run:   pause,
    35  }
    36  
    37  func pause(cmd *cobra.Command, args []string) {
    38  	fmt.Println("Paused")
    39  	sigCh := make(chan os.Signal, 1)
    40  	done := make(chan int, 1)
    41  	signal.Notify(sigCh, syscall.SIGINT)
    42  	signal.Notify(sigCh, syscall.SIGTERM)
    43  	go func() {
    44  		sig := <-sigCh
    45  		switch sig {
    46  		case syscall.SIGINT:
    47  			done <- 1
    48  			os.Exit(1)
    49  		case syscall.SIGTERM:
    50  			done <- 2
    51  			os.Exit(2)
    52  		}
    53  	}()
    54  	result := <-done
    55  	fmt.Printf("exiting %d\n", result)
    56  }
    57
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