UI: Add log file to GitHub issue output

pkg/minikube/out/out.go

@@ -24,6 +24,7 @@ import (
 	"html/template"
 	"io"
 	"os"
+	"os/exec"
 	"strconv"
 	"strings"
 	"time"
@@ -359,6 +360,29 @@ func DisplayError(msg string, err error) {
 	ErrT(style.Empty, "")
 	ErrT(style.Sad, "minikube is exiting due to an error. If the above message is not useful, open an issue:")
 	ErrT(style.URL, "https://github.com/kubernetes/minikube/issues/new/choose")
+	logFileName, err := getLatestLogFileName()
+	if err != nil {
+		klog.Warning(err)
+		return
+	}
+	ErrT(style.Tip, "If you are able to drag and drop the following log-file into the issue, we'll be able to make faster progress: {{.logFileName}}", V{"logFileName": logFileName})
+}
+
+func getLatestLogFileName() (string, error) {
+	dir := os.Getenv("TMPDIR")
+	if dir == "" {
+		dir = "/tmp/"
+	}
+	args := fmt.Sprintf("cd %s && echo %s$(ls -t *minikube_*_*_*log | head -1)", dir, dir)
+	c := exec.Command("/bin/bash", "-c", args)
+	o, err := c.Output()
+	if err != nil {
+		return "", fmt.Errorf("failed to get latest log file name: %v", err)
+	}
+	// trim newline
+	name := string(o)[:len(o)-1]
+
+	return name, nil
 }
 
 // applyTmpl applies formatting

pkg/minikube/out/out_test.go

@@ -114,3 +114,23 @@ func TestErr(t *testing.T) {
 		t.Errorf("Err() = %q, want %q", got, want)
 	}
 }
+
+func TestGetLatestLogFile(t *testing.T) {
+	td := os.Getenv("TMPDIR")
+	if td == "" {
+		td = "/tmp/"
+	}
+	want := fmt.Sprintf("%sminikube_test_test_test.log", td)
+	f, err := os.Create(want)
+	if err != nil {
+		t.Fatalf("failed to create file: %v", err)
+	}
+	defer os.Remove(f.Name())
+	got, err := getLatestLogFileName()
+	if err != nil {
+		t.Fatalf("failed to get latest log file name: %v", err)
+	}
+	if got != want {
+		t.Errorf("getLatestLogFile() = %q; want %q", got, want)
+	}
+}