Function TestLoopDevicesWithOption

pkg/block/block_linux_test.go:321–369

TestLoopDevicesWithOption tests to see if we find loop devices when the config is activated

(t *testing.T)

// TestLoopDevicesWithOption tests to see if we find loop devices when the config is activated
func TestLoopDevicesWithOption(t *testing.T) {
	if _, ok := os.LookupEnv("GHW_TESTING_SKIP_BLOCK"); ok {
		t.Skip("Skipping block tests.")
	}
	baseDir, _ := os.MkdirTemp("", "test")
	defer os.RemoveAll(baseDir)
	ctx := context.TODO()
	ctx = config.WithChroot(baseDir)(ctx)
	ctx = config.WithDisableTools()(ctx)
	paths := linuxpath.New(ctx)
	fsType := "ext4"
	expectedLoopName := "loop0"
	loopNotUsed := "loop1"
	loopPartitionName := "loop0p1"

	_ = os.MkdirAll(paths.SysBlock, 0755)
	_ = os.MkdirAll(paths.RunUdevData, 0755)

	// Emulate a loop device with one partition and another loop deviced not used
	_ = os.Mkdir(filepath.Join(paths.SysBlock, expectedLoopName), 0755)
	_ = os.Mkdir(filepath.Join(paths.SysBlock, loopNotUsed), 0755)
	_ = os.Mkdir(filepath.Join(paths.SysBlock, expectedLoopName, "queue"), 0755)
	_ = os.Mkdir(filepath.Join(paths.SysBlock, loopNotUsed, "queue"), 0755)
	_ = os.WriteFile(filepath.Join(paths.SysBlock, expectedLoopName, "queue", "rotational"), []byte("1\n"), 0644)
	_ = os.WriteFile(filepath.Join(paths.SysBlock, expectedLoopName, "size"), []byte("62810112\n"), 0644)
	_ = os.WriteFile(filepath.Join(paths.SysBlock, loopNotUsed, "size"), []byte("0\n"), 0644)
	_ = os.Mkdir(filepath.Join(paths.SysBlock, expectedLoopName, loopPartitionName), 0755)
	_ = os.WriteFile(filepath.Join(paths.SysBlock, expectedLoopName, loopPartitionName, "dev"), []byte("259:0\n"), 0644)
	_ = os.WriteFile(filepath.Join(paths.SysBlock, expectedLoopName, loopPartitionName, "size"), []byte("102400\n"), 0644)
	_ = os.WriteFile(filepath.Join(paths.RunUdevData, "b259:0"), []byte(fmt.Sprintf("E:ID_FS_TYPE=%s\n", fsType)), 0644)
	d := disks(ctx)
	// There should be one disk, the other should be ignored due to 0 size
	if len(d) != 1 {
		t.Fatalf("expected one disk device but the function reported %d", len(d))
	}
	foundDisk := d[0]
	// Should be the one we faked
	if foundDisk.Name != expectedLoopName {
		t.Fatalf("got loop device %s but expected %s", foundDisk.Name, expectedLoopName)
	}
	// Should have only one partition
	if len(foundDisk.Partitions) != 1 {
		t.Fatalf("expected one partition but the function reported %d", len(foundDisk.Partitions))
	}
	// Name should match
	if foundDisk.Partitions[0].Name != loopPartitionName {
		t.Fatalf("got partition %s but expected %s", foundDisk.Partitions[0], loopPartitionName)
	}
}