github.com/fnproject/cli@v0.0.0-20240508150455-e5d88bd86117/objects/server/server.go (about)

     1  /*
     2   * Copyright (c) 2019, 2020 Oracle and/or its affiliates. All rights reserved.
     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 server
    18  
    19  import (
    20  	"log"
    21  	"os"
    22  	"os/exec"
    23  	"os/signal"
    24  	"syscall"
    25  
    26  	"github.com/fnproject/cli/common"
    27  	"github.com/urfave/cli"
    28  )
    29  
    30  func update(c *cli.Context) error {
    31  	args := []string{"pull",
    32  		common.FunctionsDockerImage,
    33  	}
    34  	cmd := exec.Command("docker", args...)
    35  	cmd.Stdout = os.Stdout
    36  	cmd.Stderr = os.Stderr
    37  	err := cmd.Start()
    38  	if err != nil {
    39  		log.Fatalln("Starting command failed:", err)
    40  	}
    41  
    42  	done := make(chan error, 1)
    43  	go func() {
    44  		done <- cmd.Wait()
    45  	}()
    46  	// catch ctrl-c and kill
    47  	sigC := make(chan os.Signal, 2)
    48  	signal.Notify(sigC, os.Interrupt, syscall.SIGTERM)
    49  	select {
    50  	case <-sigC:
    51  		log.Println("Interrupt caught, exiting")
    52  		err = cmd.Process.Kill()
    53  		if err != nil {
    54  			log.Println("Error: could not kill process")
    55  		}
    56  	case err := <-done:
    57  		if err != nil {
    58  			log.Println("Processed finished with error:", err)
    59  		} else {
    60  			log.Println("Process finished gracefully")
    61  		}
    62  	}
    63  	return nil
    64  }