hypeman/lib/hypervisor/firecracker/config_test.go at 030b69e79f0db2f4b5fcf1ef1df723998e4d8cd9 · kernel/hypeman · GitHub

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package firecracker

import (
	"os"
	"path/filepath"
	"testing"

	"github.com/kernel/hypeman/lib/hypervisor"
	"github.com/stretchr/testify/assert"
	"github.com/stretchr/testify/require"
)

func TestToDriveConfigs(t *testing.T) {
	cfg := hypervisor.VMConfig{
		Disks: []hypervisor.DiskConfig{
			{Path: "/rootfs.raw", Readonly: true, IOBps: 1024, IOBurstBps: 4096},
			{Path: "/overlay.raw", Readonly: false},
		},
	}

	drives := toDriveConfigs(cfg)
	require.Len(t, drives, 2)

	assert.Equal(t, "rootfs", drives[0].DriveID)
	assert.True(t, drives[0].IsRootDevice)
	assert.True(t, drives[0].IsReadOnly)
	require.NotNil(t, drives[0].RateLimiter)
	require.NotNil(t, drives[0].RateLimiter.Bandwidth)
	assert.Equal(t, int64(1024), drives[0].RateLimiter.Bandwidth.Size)
	assert.Equal(t, int64(1000), drives[0].RateLimiter.Bandwidth.RefillTime)
	require.NotNil(t, drives[0].RateLimiter.Bandwidth.OneTimeBurst)
	assert.Equal(t, int64(3072), *drives[0].RateLimiter.Bandwidth.OneTimeBurst)

	assert.Equal(t, "disk1", drives[1].DriveID)
	assert.False(t, drives[1].IsRootDevice)
	assert.False(t, drives[1].IsReadOnly)
	assert.Nil(t, drives[1].RateLimiter)
}

func TestToNetworkInterfaces(t *testing.T) {
	cfg := hypervisor.VMConfig{
		Networks: []hypervisor.NetworkConfig{
			{
				TAPDevice:   "hype-abc123",
				MAC:         "02:00:00:00:00:01",
				DownloadBps: 1_000_000,
				UploadBps:   2_000_000,
			},
		},
	}

	nets := toNetworkInterfaces(cfg)
	require.Len(t, nets, 1)
	assert.Equal(t, "eth0", nets[0].IfaceID)
	assert.Equal(t, "hype-abc123", nets[0].HostDevName)
	assert.Equal(t, "02:00:00:00:00:01", nets[0].GuestMAC)
	require.NotNil(t, nets[0].RxRateLimiter)
	require.NotNil(t, nets[0].TxRateLimiter)
	assert.Equal(t, int64(1_000_000), nets[0].RxRateLimiter.Bandwidth.Size)
	assert.Equal(t, int64(2_000_000), nets[0].TxRateLimiter.Bandwidth.Size)
}

func TestSnapshotParamPaths(t *testing.T) {
	t.Run("uses full snapshots when no retained base exists", func(t *testing.T) {
		snapshotDir := filepath.Join(t.TempDir(), "snapshot-latest")
		create := toSnapshotCreateParams(snapshotDir)
		assert.Equal(t, filepath.Join(snapshotDir, "state"), create.SnapshotPath)
		assert.Equal(t, filepath.Join(snapshotDir, "memory"), create.MemFilePath)
		assert.Equal(t, "Full", create.SnapshotType)
	})

	t.Run("uses diff snapshots when retained base memory exists", func(t *testing.T) {
		snapshotDir := filepath.Join(t.TempDir(), "snapshot-latest")
		require.NoError(t, os.MkdirAll(snapshotDir, 0755))
		require.NoError(t, os.WriteFile(filepath.Join(snapshotDir, "memory"), []byte("base"), 0644))

		create := toSnapshotCreateParams(snapshotDir)
		assert.Equal(t, filepath.Join(snapshotDir, "state"), create.SnapshotPath)
		assert.Equal(t, filepath.Join(snapshotDir, "memory"), create.MemFilePath)
		assert.Equal(t, "Diff", create.SnapshotType)
	})

	load := toSnapshotLoadParams("/tmp/snapshot-latest", []networkOverride{
		{IfaceID: "eth0", HostDevName: "hype-abc123"},
	}, "")
	assert.Equal(t, "/tmp/snapshot-latest/state", load.SnapshotPath)
	assert.Equal(t, "/tmp/snapshot-latest/memory", load.MemFilePath)
	assert.Nil(t, load.MemBackend)
	assert.True(t, load.EnableDiffSnapshots)
	assert.False(t, load.ResumeVM)
	require.Len(t, load.NetworkOverrides, 1)

	loadUffd := toSnapshotLoadParams("/tmp/snapshot-latest", nil, "/run/uffd/abc.sock")
	assert.Equal(t, "", loadUffd.MemFilePath, "mem_file_path must be empty when a uffd backend is set")
	require.NotNil(t, loadUffd.MemBackend)
	assert.Equal(t, "Uffd", loadUffd.MemBackend.BackendType)
	assert.Equal(t, "/run/uffd/abc.sock", loadUffd.MemBackend.BackendPath)
}

func TestToBalloonConfig(t *testing.T) {
	cfg := hypervisor.VMConfig{
		GuestMemory: hypervisor.GuestMemoryConfig{
			EnableBalloon:     true,
			DeflateOnOOM:      true,
			FreePageHinting:   true,
			FreePageReporting: true,
		},
	}

	b := toBalloonConfig(cfg)
	require.NotNil(t, b)
	assert.Equal(t, int64(0), b.AmountMib)
	assert.True(t, b.DeflateOnOOM)
	assert.True(t, b.FreePageHinting)
	assert.True(t, b.FreePageReporting)
}