terraform/main.go

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package main
import (
"fmt"
"io"
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"io/ioutil"
"log"
"os"
"github.com/hashicorp/terraform/plugin"
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"github.com/mitchellh/cli"
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"github.com/mitchellh/panicwrap"
"github.com/mitchellh/prefixedio"
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)
func main() {
os.Exit(realMain())
}
func realMain() int {
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var wrapConfig panicwrap.WrapConfig
if !panicwrap.Wrapped(&wrapConfig) {
// Determine where logs should go in general (requested by the user)
logWriter, err := logOutput()
if err != nil {
fmt.Fprintf(os.Stderr, "Couldn't setup log output: %s", err)
return 1
}
if logWriter == nil {
logWriter = ioutil.Discard
}
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// We always send logs to a temporary file that we use in case
// there is a panic. Otherwise, we delete it.
logTempFile, err := ioutil.TempFile("", "terraform-log")
if err != nil {
fmt.Fprintf(os.Stderr, "Couldn't setup logging tempfile: %s", err)
return 1
}
defer os.Remove(logTempFile.Name())
defer logTempFile.Close()
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// Tell the logger to log to this file
os.Setenv(EnvLog, "")
os.Setenv(EnvLogFile, "")
// Setup the prefixed readers that send data properly to
// stdout/stderr.
outR, outW := io.Pipe()
go copyOutput(outR)
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// Create the configuration for panicwrap and wrap our executable
wrapConfig.Handler = panicHandler(logTempFile)
wrapConfig.Writer = io.MultiWriter(logTempFile, logWriter)
wrapConfig.Stdout = outW
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exitStatus, err := panicwrap.Wrap(&wrapConfig)
if err != nil {
fmt.Fprintf(os.Stderr, "Couldn't start Terraform: %s", err)
return 1
}
// If >= 0, we're the parent, so just exit
if exitStatus >= 0 {
return exitStatus
}
// We're the child, so just close the tempfile we made in order to
// save file handles since the tempfile is only used by the parent.
logTempFile.Close()
}
// Call the real main
return wrappedMain()
}
func wrappedMain() int {
log.SetOutput(os.Stderr)
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// Load the configuration
config := BuiltinConfig
// Make sure we clean up any managed plugins at the end of this
defer plugin.CleanupClients()
// Initialize the TFConfig settings for the commands...
TFConfig.Providers = config.ProviderFactories()
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// Get the command line args. We shortcut "--version" and "-v" to
// just show the version.
args := os.Args[1:]
for _, arg := range args {
if arg == "-v" || arg == "--version" {
newArgs := make([]string, len(args)+1)
newArgs[0] = "version"
copy(newArgs[1:], args)
args = newArgs
break
}
}
cli := &cli.CLI{
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Args: args,
Commands: Commands,
HelpFunc: cli.BasicHelpFunc("terraform"),
HelpWriter: os.Stdout,
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}
exitCode, err := cli.Run()
if err != nil {
fmt.Fprintf(os.Stderr, "Error executing CLI: %s\n", err.Error())
return 1
}
return exitCode
}
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// copyOutput uses output prefixes to determine whether data on stdout
// should go to stdout or stderr. This is due to panicwrap using stderr
// as the log and error channel.
func copyOutput(r io.Reader) {
pr, err := prefixedio.NewReader(r)
if err != nil {
panic(err)
}
stderrR, err := pr.Prefix(ErrorPrefix)
if err != nil {
panic(err)
}
stdoutR, err := pr.Prefix(OutputPrefix)
if err != nil {
panic(err)
}
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defaultR, err := pr.Prefix("")
if err != nil {
panic(err)
}
go io.Copy(os.Stderr, stderrR)
go io.Copy(os.Stdout, stdoutR)
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go io.Copy(os.Stdout, defaultR)
}