Test device numbers

fileutils.go

@@ -139,19 +139,16 @@ func CopyDirectory(source string, dest string) error {
 			return nil
 		}
 
-		// Copy the file.
-		if err := CopyFile(path, filepath.Join(dest, relPath)); err != nil {
-			return err
-		}
-
-		return nil
+		return CopyFile(path, filepath.Join(dest, relPath))
 	})
 }
 
+// Gives a number indicating the device driver to be used to access the passed device
 func major(device uint64) uint64 {
 	return (device >> 8) & 0xfff
 }
 
+// Gives a number that serves as a flag to the device driver for the passed device
 func minor(device uint64) uint64 {
 	return (device & 0xff) | ((device >> 12) & 0xfff00)
 }

fileutils_test.go

@@ -0,0 +1,68 @@
+package fileutils
+
+import (
+	"os"
+	"syscall"
+	"testing"
+)
+
+type device struct {
+	device string
+	major  uint64
+	minor  uint64
+}
+
+func TestDeviceNumbers(t *testing.T) {
+	devices := []device{
+		{
+			device: "/dev/mem",
+			major:  1,
+			minor:  1,
+		},
+		{
+			device: "/dev/urandom",
+			major:  1,
+			minor:  9,
+		},
+		{
+			device: "/dev/tty0",
+			major:  4,
+			minor:  0,
+		},
+		{
+			device: "/dev/tty",
+			major:  5,
+			minor:  0,
+		},
+	}
+
+	for _, device := range devices {
+		si, err := os.Lstat(device.device)
+		if err != nil {
+			t.Errorf("not able to Lstat the device: %v", err)
+		}
+
+		st, ok := si.Sys().(*syscall.Stat_t)
+
+		if !ok {
+			t.Errorf("could not convert to syscall.Stat_t")
+		}
+
+		internalDevice := uint64(st.Rdev)
+
+		givenMajor := major(internalDevice)
+		if givenMajor != device.major {
+			t.Errorf("%s major not matching - expected: %d - given: %d", device.device, device.major, givenMajor)
+		}
+
+		givenMinor := minor(internalDevice)
+		if givenMinor != device.minor {
+			t.Errorf("%s minor not matching - expected: %d - given: %d", device.device, device.minor, givenMinor)
+		}
+
+		givenMkdev := mkdev(int64(device.major), int64(device.minor))
+		if givenMkdev != uint32(internalDevice) {
+			t.Errorf("%s mkdev not matching - expected: %d - given: %d", device.device, uint32(internalDevice), givenMkdev)
+		}
+	}
+}