move panicwrap handler to logging package

internal/logging/panic.go

@@ -1,8 +1,9 @@
-package main
+package logging
 
 import (
 	"fmt"
 	"io"
+	"io/ioutil"
 	"os"
 	"strings"
 
@@ -15,7 +16,7 @@ const panicOutput = `
 !!!!!!!!!!!!!!!!!!!!!!!!!!! TERRAFORM CRASH !!!!!!!!!!!!!!!!!!!!!!!!!!!!
 
 Terraform crashed! This is always indicative of a bug within Terraform.
-A crash log has been placed at "crash.log" relative to your current
+A crash log has been placed at %[1]q relative to your current
 working directory. It would be immensely helpful if you could please
 report the crash with Terraform[1] so that we can fix this.
 
@@ -23,7 +24,7 @@ When reporting bugs, please include your terraform version. That
 information is available on the first line of crash.log. You can also
 get it by running 'terraform --version' on the command line.
 
-SECURITY WARNING: the "crash.log" file that was created may contain 
+SECURITY WARNING: the %[1]q file that was created may contain 
 sensitive information that must be redacted before it is safe to share 
 on the issue tracker.
 
@@ -36,14 +37,10 @@ on the issue tracker.
 // within Terraform. It is guaranteed to run after the resulting process has
 // exited so we can take the log file, add in the panic, and store it
 // somewhere locally.
-func panicHandler(logF *os.File) panicwrap.HandlerFunc {
+func PanicHandler(logF *os.File) panicwrap.HandlerFunc {
 	return func(m string) {
-		// Right away just output this thing on stderr so that it gets
-		// shown in case anything below fails.
-		fmt.Fprintf(os.Stderr, fmt.Sprintf("%s\n", m))
-
 		// Create the crash log file where we'll write the logs
-		f, err := os.Create("crash.log")
+		f, err := ioutil.TempFile(".", "crash.*.log")
 		if err != nil {
 			fmt.Fprintf(os.Stderr, "Failed to create crash log file: %s", err)
 			return
@@ -66,6 +63,6 @@ func panicHandler(logF *os.File) panicwrap.HandlerFunc {
 		// Tell the user a crash occurred in some helpful way that
 		// they'll hopefully notice.
 		fmt.Printf("\n\n")
-		fmt.Println(strings.TrimSpace(panicOutput))
+		fmt.Printf(strings.TrimSpace(panicOutput), f.Name())
 	}
 }

main.go

@@ -19,6 +19,7 @@ import (
 	"github.com/hashicorp/terraform/command/cliconfig"
 	"github.com/hashicorp/terraform/command/format"
 	"github.com/hashicorp/terraform/httpclient"
+	"github.com/hashicorp/terraform/internal/logging"
 	"github.com/hashicorp/terraform/version"
 	"github.com/mattn/go-colorable"
 	"github.com/mattn/go-shellwords"
@@ -65,8 +66,7 @@ func realMain() int {
 		go copyOutput(outR, doneCh)
 
 		// Create the configuration for panicwrap and wrap our executable
-		wrapConfig.Handler = panicHandler(logTempFile)
-		wrapConfig.Writer = os.Stderr
+		wrapConfig.Handler = logging.PanicHandler(logTempFile)
 		wrapConfig.Stdout = outW
 		wrapConfig.IgnoreSignals = ignoreSignals
 		wrapConfig.ForwardSignals = forwardSignals