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 }