github.com/nevins-b/terraform@v0.3.8-0.20170215184714-bbae22007d5a/command/init.go (about) 1 package command 2 3 import ( 4 "fmt" 5 "os" 6 "path/filepath" 7 "strings" 8 9 "github.com/hashicorp/go-getter" 10 "github.com/hashicorp/terraform/config" 11 "github.com/hashicorp/terraform/config/module" 12 ) 13 14 // InitCommand is a Command implementation that takes a Terraform 15 // module and clones it to the working directory. 16 type InitCommand struct { 17 Meta 18 } 19 20 func (c *InitCommand) Run(args []string) int { 21 var flagBackend, flagGet bool 22 var flagConfigFile string 23 args = c.Meta.process(args, false) 24 cmdFlags := c.flagSet("init") 25 cmdFlags.BoolVar(&flagBackend, "backend", true, "") 26 cmdFlags.StringVar(&flagConfigFile, "backend-config", "", "") 27 cmdFlags.BoolVar(&flagGet, "get", true, "") 28 cmdFlags.Usage = func() { c.Ui.Error(c.Help()) } 29 if err := cmdFlags.Parse(args); err != nil { 30 return 1 31 } 32 33 // Validate the arg count 34 args = cmdFlags.Args() 35 if len(args) > 2 { 36 c.Ui.Error("The init command expects at most two arguments.\n") 37 cmdFlags.Usage() 38 return 1 39 } 40 41 // Get our pwd. We don't always need it but always getting it is easier 42 // than the logic to determine if it is or isn't needed. 43 pwd, err := os.Getwd() 44 if err != nil { 45 c.Ui.Error(fmt.Sprintf("Error getting pwd: %s", err)) 46 return 1 47 } 48 49 // Get the path and source module to copy 50 var path string 51 var source string 52 switch len(args) { 53 case 0: 54 path = pwd 55 case 1: 56 path = pwd 57 source = args[0] 58 case 2: 59 source = args[0] 60 path = args[1] 61 default: 62 panic("assertion failed on arg count") 63 } 64 65 // Set the state out path to be the path requested for the module 66 // to be copied. This ensures any remote states gets setup in the 67 // proper directory. 68 c.Meta.dataDir = filepath.Join(path, DefaultDataDir) 69 70 // This will track whether we outputted anything so that we know whether 71 // to output a newline before the success message 72 var header bool 73 74 // If we have a source, copy it 75 if source != "" { 76 c.Ui.Output(c.Colorize().Color(fmt.Sprintf( 77 "[reset][bold]"+ 78 "Initializing configuration from: %q...", source))) 79 if err := c.copySource(path, source, pwd); err != nil { 80 c.Ui.Error(fmt.Sprintf( 81 "Error copying source: %s", err)) 82 return 1 83 } 84 85 header = true 86 } 87 88 // If our directory is empty, then we're done. We can't get or setup 89 // the backend with an empty directory. 90 if empty, err := config.IsEmptyDir(path); err != nil { 91 c.Ui.Error(fmt.Sprintf( 92 "Error checking configuration: %s", err)) 93 return 1 94 } else if empty { 95 c.Ui.Output(c.Colorize().Color(strings.TrimSpace(outputInitEmpty))) 96 return 0 97 } 98 99 // If we're performing a get or loading the backend, then we perform 100 // some extra tasks. 101 if flagGet || flagBackend { 102 // Load the configuration in this directory so that we can know 103 // if we have anything to get or any backend to configure. We do 104 // this to improve the UX. Practically, we could call the functions 105 // below without checking this to the same effect. 106 conf, err := config.LoadDir(path) 107 if err != nil { 108 c.Ui.Error(fmt.Sprintf( 109 "Error loading configuration: %s", err)) 110 return 1 111 } 112 113 // If we requested downloading modules and have modules in the config 114 if flagGet && len(conf.Modules) > 0 { 115 header = true 116 117 c.Ui.Output(c.Colorize().Color(fmt.Sprintf( 118 "[reset][bold]" + 119 "Downloading modules (if any)..."))) 120 if err := getModules(&c.Meta, path, module.GetModeGet); err != nil { 121 c.Ui.Error(fmt.Sprintf( 122 "Error downloading modules: %s", err)) 123 return 1 124 } 125 } 126 127 // If we're requesting backend configuration and configure it 128 hasBackend := conf.Terraform != nil && conf.Terraform.Backend != nil 129 if flagBackend && hasBackend { 130 header = true 131 132 c.Ui.Output(c.Colorize().Color(fmt.Sprintf( 133 "[reset][bold]" + 134 "Initializing the backend..."))) 135 136 opts := &BackendOpts{ 137 ConfigPath: path, 138 ConfigFile: flagConfigFile, 139 Init: true, 140 } 141 if _, err := c.Backend(opts); err != nil { 142 c.Ui.Error(err.Error()) 143 return 1 144 } 145 } 146 } 147 148 // If we outputted information, then we need to output a newline 149 // so that our success message is nicely spaced out from prior text. 150 if header { 151 c.Ui.Output("") 152 } 153 154 c.Ui.Output(c.Colorize().Color(strings.TrimSpace(outputInitSuccess))) 155 156 return 0 157 } 158 159 func (c *InitCommand) copySource(dst, src, pwd string) error { 160 // Verify the directory is empty 161 if empty, err := config.IsEmptyDir(dst); err != nil { 162 return fmt.Errorf("Error checking on destination path: %s", err) 163 } else if !empty { 164 return fmt.Errorf(strings.TrimSpace(errInitCopyNotEmpty)) 165 } 166 167 // Detect 168 source, err := getter.Detect(src, pwd, getter.Detectors) 169 if err != nil { 170 return fmt.Errorf("Error with module source: %s", err) 171 } 172 173 // Get it! 174 return module.GetCopy(dst, source) 175 } 176 177 func (c *InitCommand) Help() string { 178 helpText := ` 179 Usage: terraform init [options] [SOURCE] [PATH] 180 181 Initialize a new or existing Terraform environment by creating 182 initial files, loading any remote state, downloading modules, etc. 183 184 This is the first command that should be run for any new or existing 185 Terraform configuration per machine. This sets up all the local data 186 necessary to run Terraform that is typically not comitted to version 187 control. 188 189 This command is always safe to run multiple times. Though subsequent runs 190 may give errors, this command will never blow away your environment or state. 191 Even so, if you have important information, please back it up prior to 192 running this command just in case. 193 194 If no arguments are given, the configuration in this working directory 195 is initialized. 196 197 If one or two arguments are given, the first is a SOURCE of a module to 198 download to the second argument PATH. After downloading the module to PATH, 199 the configuration will be initialized as if this command were called pointing 200 only to that PATH. PATH must be empty of any Terraform files. Any 201 conflicting non-Terraform files will be overwritten. The module download 202 is a copy. If you're downloading a module from Git, it will not preserve 203 Git history. 204 205 Options: 206 207 -backend=true Configure the backend for this environment. 208 209 -backend-config=path A path to load additional configuration for the backend. 210 This is merged with what is in the configuration file. 211 212 -get=true Download any modules for this configuration. 213 214 -input=true Ask for input if necessary. If false, will error if 215 input was required. 216 217 -no-color If specified, output won't contain any color. 218 219 ` 220 return strings.TrimSpace(helpText) 221 } 222 223 func (c *InitCommand) Synopsis() string { 224 return "Initialize a new or existing Terraform configuration" 225 } 226 227 const errInitCopyNotEmpty = ` 228 The destination path contains Terraform configuration files. The init command 229 with a SOURCE parameter can only be used on a directory without existing 230 Terraform files. 231 232 Please resolve this issue and try again. 233 ` 234 235 const outputInitEmpty = ` 236 [reset][bold]Terraform initialized in an empty directory![reset] 237 238 The directory has no Terraform configuration files. You may begin working 239 with Terraform immediately by creating Terraform configuration files. 240 ` 241 242 const outputInitSuccess = ` 243 [reset][bold][green]Terraform has been successfully initialized![reset][green] 244 245 You may now begin working with Terraform. Try running "terraform plan" to see 246 any changes that are required for your infrastructure. All Terraform commands 247 should now work. 248 249 If you ever set or change modules or backend configuration for Terraform, 250 rerun this command to reinitialize your environment. If you forget, other 251 commands will detect it and remind you to do so if necessary. 252 `