added osutils.IsProbablyGoRun

tools/osutils/cmd.go

@@ -63,3 +63,17 @@ func YesNoPrompt(message string, fallback bool) bool {
 		}
 	}
 }
+
+// IsProbablyGoRun loosely checks if the current executable is running
+// as a result of "go run".
+func IsProbablyGoRun() bool {
+	runDirs := []string{os.TempDir(), os.Getenv("GOCACHE")}
+
+	for _, dir := range runDirs {
+		if dir != "" && strings.HasPrefix(os.Args[0], dir) {
+			return true
+		}
+	}
+
+	return false
+}

tools/osutils/cmd_test.go

@@ -64,3 +64,40 @@ func TestYesNoPrompt(t *testing.T) {
 		})
 	}
 }
+
+func TestIsProbablyGoRun(t *testing.T) {
+	scenarios := []struct {
+		arg      string
+		envs     map[string]string
+		expected bool
+	}{
+		{"", nil, false},
+		{"a/b/c", nil, false},
+		{"/a/b/c", nil, false},
+		{"/a/b/c", map[string]string{"GOCACHE": "/b/"}, false},
+		{"/a/b/c", map[string]string{"GOCACHE": "/a/"}, true},
+		{os.TempDir() + "/a/b/c", nil, true},
+	}
+
+	originalArgs := os.Args
+	defer func() {
+		os.Args = originalArgs
+	}()
+
+	for _, s := range scenarios {
+		t.Run(s.arg, func(t *testing.T) {
+			os.Args = []string{s.arg}
+
+			for k, v := range s.envs {
+				defer os.Setenv(k, os.Getenv(k))
+				os.Setenv(k, v)
+			}
+
+			result := osutils.IsProbablyGoRun()
+
+			if result != s.expected {
+				t.Fatalf("Expected %v, got %v", s.expected, result)
+			}
+		})
+	}
+}