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