github.com/andrewsun2898/u-root@v6.0.1-0.20200616011413-4b2895c1b815+incompatible/cmds/exp/esxiboot/esxiboot.go (about) 1 // Copyright 2019 the u-root Authors. All rights reserved 2 // Use of this source code is governed by a BSD-style 3 // license that can be found in the LICENSE file. 4 5 // esxiboot executes ESXi kernel over the running kernel. 6 // 7 // Synopsis: 8 // esxiboot [-d --device] [-c --config] [-r --cdrom] 9 // 10 // Description: 11 // Loads and executes ESXi kernel. 12 // 13 // Options: 14 // --config=FILE or -c=FILE: set the ESXi config 15 // --device=FILE or -d=FILE: set an ESXi disk to boot from 16 // --cdrom=FILE or -r=FILE: set an ESXI CDROM to boot from 17 // --append: append kernel cmdline arguments 18 // 19 // --device is required to kexec installed ESXi instance. 20 // You don't need it if you kexec ESXi installer. 21 // 22 // The config file has the following syntax: 23 // 24 // kernel=PATH 25 // kernelopt=OPTS 26 // modules=MOD1 [ARGS] --- MOD2 [ARGS] --- ... 27 // 28 // Lines starting with '#' are ignored. 29 30 package main 31 32 import ( 33 "log" 34 "os" 35 "strings" 36 37 flag "github.com/spf13/pflag" 38 "github.com/u-root/u-root/pkg/boot" 39 "github.com/u-root/u-root/pkg/boot/esxi" 40 ) 41 42 var ( 43 cfg = flag.StringP("config", "c", "", "ESXi config file") 44 cdrom = flag.StringP("cdrom", "r", "", "ESXi CDROM boot device") 45 diskDev = flag.StringP("device", "d", "", "ESXi disk boot device") 46 appendCmdline = flag.StringArray("append", nil, "Arguments to append to kernel cmdline") 47 dryRun = flag.Bool("dry-run", false, "dry run (just mount + load the kernel, don't kexec)") 48 ) 49 50 func main() { 51 flag.Parse() 52 if *diskDev == "" && *cfg == "" && *cdrom == "" { 53 log.Printf("Either --config, --device, or --cdrom must be specified") 54 flag.PrintDefaults() 55 os.Exit(1) 56 } 57 58 if len(*diskDev) > 0 { 59 imgs, err := esxi.LoadDisk(*diskDev) 60 if err != nil { 61 log.Fatalf("Failed to load ESXi configuration: %v", err) 62 } 63 64 loaded := false 65 for _, img := range imgs { 66 if len(*appendCmdline) > 0 { 67 img.Cmdline = img.Cmdline + " " + strings.Join(*appendCmdline, " ") 68 } 69 if err := img.Load(false); err != nil { 70 log.Printf("Failed to load ESXi image (%v) into memory: %v", img, err) 71 } else { 72 log.Printf("Loaded image: %v", img) 73 // We loaded one, that's it. 74 loaded = true 75 break 76 } 77 } 78 if !loaded { 79 log.Fatalf("Failed to load all ESXi images found.") 80 } 81 } else { 82 var err error 83 var img *boot.MultibootImage 84 if len(*cfg) > 0 { 85 img, err = esxi.LoadConfig(*cfg) 86 } else if len(*cdrom) > 0 { 87 img, err = esxi.LoadCDROM(*cdrom) 88 } 89 if err != nil { 90 log.Fatalf("Failed to load ESXi configuration: %v", err) 91 } 92 if len(*appendCmdline) > 0 { 93 img.Cmdline = img.Cmdline + " " + strings.Join(*appendCmdline, " ") 94 } 95 if err := img.Load(false); err != nil { 96 log.Fatalf("Failed to load ESXi image (%v) into memory: %v", img, err) 97 } 98 log.Printf("Loaded image: %v", img) 99 } 100 101 if *dryRun { 102 log.Printf("Dry run: not booting kernel.") 103 os.Exit(0) 104 } 105 if err := boot.Execute(); err != nil { 106 log.Fatalf("Failed to boot image: %v", err) 107 } 108 }