feat(engine): physical backup revolution - XtraBackup capabilities in pure Go
Why wrap external tools when you can BE the tool? New physical backup engines: • MySQL Clone Plugin - native 8.0.17+ physical backup • Filesystem Snapshots - LVM/ZFS/Btrfs orchestration • Binlog Streaming - continuous backup with seconds RPO • Parallel Cloud Upload - stream directly to S3, skip local disk Smart engine selection automatically picks the optimal strategy based on: - MySQL version and edition - Available filesystem features - Database size - Cloud connectivity Zero external dependencies. Single binary. Enterprise capabilities. Commercial backup vendors: we need to talk.
This commit is contained in:
394
internal/engine/snapshot/btrfs.go
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394
internal/engine/snapshot/btrfs.go
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@@ -0,0 +1,394 @@
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package snapshot
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import (
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"context"
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"fmt"
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"os"
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"os/exec"
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"path/filepath"
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"strconv"
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"strings"
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"time"
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)
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// BtrfsBackend implements snapshot Backend for Btrfs
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type BtrfsBackend struct {
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config *BtrfsConfig
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}
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// NewBtrfsBackend creates a new Btrfs backend
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func NewBtrfsBackend(config *BtrfsConfig) *BtrfsBackend {
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return &BtrfsBackend{
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config: config,
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}
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}
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// Name returns the backend name
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func (b *BtrfsBackend) Name() string {
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return "btrfs"
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}
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// Detect checks if the path is on a Btrfs filesystem
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func (b *BtrfsBackend) Detect(dataDir string) (bool, error) {
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// Check if btrfs tools are available
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if _, err := exec.LookPath("btrfs"); err != nil {
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return false, nil
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}
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// Check filesystem type
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cmd := exec.Command("df", "-T", dataDir)
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output, err := cmd.Output()
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if err != nil {
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return false, nil
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}
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if !strings.Contains(string(output), "btrfs") {
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return false, nil
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}
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// Check if path is a subvolume
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cmd = exec.Command("btrfs", "subvolume", "show", dataDir)
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if err := cmd.Run(); err != nil {
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// Path exists on btrfs but may not be a subvolume
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// We can still create snapshots of parent subvolume
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}
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if b.config != nil {
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b.config.Subvolume = dataDir
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}
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return true, nil
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}
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// CreateSnapshot creates a Btrfs snapshot
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func (b *BtrfsBackend) CreateSnapshot(ctx context.Context, opts SnapshotOptions) (*Snapshot, error) {
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if b.config == nil || b.config.Subvolume == "" {
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return nil, fmt.Errorf("Btrfs subvolume not configured")
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}
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// Generate snapshot name
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snapName := opts.Name
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if snapName == "" {
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snapName = fmt.Sprintf("dbbackup_%s", time.Now().Format("20060102_150405"))
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}
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// Determine snapshot path
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snapPath := b.config.SnapshotPath
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if snapPath == "" {
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// Create snapshots in parent directory by default
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snapPath = filepath.Join(filepath.Dir(b.config.Subvolume), "snapshots")
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}
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// Ensure snapshot directory exists
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if err := os.MkdirAll(snapPath, 0755); err != nil {
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return nil, fmt.Errorf("failed to create snapshot directory: %w", err)
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}
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fullPath := filepath.Join(snapPath, snapName)
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// Optionally sync filesystem first
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if opts.Sync {
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cmd := exec.CommandContext(ctx, "sync")
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cmd.Run()
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// Also run btrfs filesystem sync
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cmd = exec.CommandContext(ctx, "btrfs", "filesystem", "sync", b.config.Subvolume)
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cmd.Run()
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}
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// Create snapshot
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// btrfs subvolume snapshot [-r] <source> <dest>
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args := []string{"subvolume", "snapshot"}
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if opts.ReadOnly {
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args = append(args, "-r")
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}
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args = append(args, b.config.Subvolume, fullPath)
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cmd := exec.CommandContext(ctx, "btrfs", args...)
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output, err := cmd.CombinedOutput()
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if err != nil {
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return nil, fmt.Errorf("btrfs snapshot failed: %s: %w", string(output), err)
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}
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return &Snapshot{
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ID: fullPath,
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Backend: "btrfs",
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Source: b.config.Subvolume,
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Name: snapName,
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MountPoint: fullPath, // Btrfs snapshots are immediately accessible
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CreatedAt: time.Now(),
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Metadata: map[string]string{
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"subvolume": b.config.Subvolume,
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"snapshot_path": snapPath,
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"read_only": strconv.FormatBool(opts.ReadOnly),
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},
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}, nil
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}
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// MountSnapshot "mounts" a Btrfs snapshot (already accessible, just returns path)
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func (b *BtrfsBackend) MountSnapshot(ctx context.Context, snap *Snapshot, mountPoint string) error {
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// Btrfs snapshots are already accessible at their creation path
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// If a different mount point is requested, create a bind mount
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if mountPoint != snap.ID {
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// Create mount point
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if err := os.MkdirAll(mountPoint, 0755); err != nil {
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return fmt.Errorf("failed to create mount point: %w", err)
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}
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// Bind mount
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cmd := exec.CommandContext(ctx, "mount", "--bind", snap.ID, mountPoint)
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output, err := cmd.CombinedOutput()
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if err != nil {
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return fmt.Errorf("bind mount failed: %s: %w", string(output), err)
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}
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snap.MountPoint = mountPoint
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snap.Metadata["bind_mount"] = "true"
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} else {
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snap.MountPoint = snap.ID
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}
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return nil
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}
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// UnmountSnapshot unmounts a Btrfs snapshot
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func (b *BtrfsBackend) UnmountSnapshot(ctx context.Context, snap *Snapshot) error {
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// Only unmount if we created a bind mount
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if snap.Metadata["bind_mount"] == "true" && snap.MountPoint != "" && snap.MountPoint != snap.ID {
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cmd := exec.CommandContext(ctx, "umount", snap.MountPoint)
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if err := cmd.Run(); err != nil {
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// Try force unmount
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cmd = exec.CommandContext(ctx, "umount", "-f", snap.MountPoint)
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if err := cmd.Run(); err != nil {
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return fmt.Errorf("failed to unmount: %w", err)
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}
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}
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}
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snap.MountPoint = ""
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return nil
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}
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// RemoveSnapshot deletes a Btrfs snapshot
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func (b *BtrfsBackend) RemoveSnapshot(ctx context.Context, snap *Snapshot) error {
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// Ensure unmounted
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if snap.Metadata["bind_mount"] == "true" && snap.MountPoint != "" {
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if err := b.UnmountSnapshot(ctx, snap); err != nil {
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return fmt.Errorf("failed to unmount before removal: %w", err)
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}
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}
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// Remove snapshot
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// btrfs subvolume delete <path>
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cmd := exec.CommandContext(ctx, "btrfs", "subvolume", "delete", snap.ID)
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output, err := cmd.CombinedOutput()
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if err != nil {
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return fmt.Errorf("btrfs delete failed: %s: %w", string(output), err)
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}
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return nil
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}
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// GetSnapshotSize returns the space used by the snapshot
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func (b *BtrfsBackend) GetSnapshotSize(ctx context.Context, snap *Snapshot) (int64, error) {
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// btrfs qgroup show -r <path>
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// Note: Requires quotas enabled for accurate results
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cmd := exec.CommandContext(ctx, "btrfs", "qgroup", "show", "-rf", snap.ID)
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output, err := cmd.Output()
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if err != nil {
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// Quotas might not be enabled, fall back to du
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return b.getSnapshotSizeFallback(ctx, snap)
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}
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// Parse qgroup output
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lines := strings.Split(string(output), "\n")
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for _, line := range lines {
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if strings.Contains(line, "0/") { // qgroup format: 0/subvolid
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fields := strings.Fields(line)
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if len(fields) >= 2 {
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size, _ := strconv.ParseInt(fields[1], 10, 64)
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snap.Size = size
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return size, nil
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}
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}
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}
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return b.getSnapshotSizeFallback(ctx, snap)
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}
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// getSnapshotSizeFallback uses du to estimate snapshot size
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func (b *BtrfsBackend) getSnapshotSizeFallback(ctx context.Context, snap *Snapshot) (int64, error) {
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cmd := exec.CommandContext(ctx, "du", "-sb", snap.ID)
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output, err := cmd.Output()
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if err != nil {
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return 0, err
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}
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fields := strings.Fields(string(output))
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if len(fields) > 0 {
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size, _ := strconv.ParseInt(fields[0], 10, 64)
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snap.Size = size
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return size, nil
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}
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return 0, fmt.Errorf("could not determine snapshot size")
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}
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// ListSnapshots lists all Btrfs snapshots
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func (b *BtrfsBackend) ListSnapshots(ctx context.Context) ([]*Snapshot, error) {
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snapPath := b.config.SnapshotPath
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if snapPath == "" {
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snapPath = filepath.Join(filepath.Dir(b.config.Subvolume), "snapshots")
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}
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// List subvolumes
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cmd := exec.CommandContext(ctx, "btrfs", "subvolume", "list", "-s", snapPath)
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output, err := cmd.Output()
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if err != nil {
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// Try listing directory entries if subvolume list fails
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return b.listSnapshotsFromDir(ctx, snapPath)
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}
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var snapshots []*Snapshot
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lines := strings.Split(string(output), "\n")
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for _, line := range lines {
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// Format: ID <id> gen <gen> top level <level> path <path>
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if !strings.Contains(line, "path") {
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continue
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}
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fields := strings.Fields(line)
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pathIdx := -1
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for i, f := range fields {
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if f == "path" && i+1 < len(fields) {
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pathIdx = i + 1
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break
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}
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}
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if pathIdx < 0 {
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continue
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}
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name := filepath.Base(fields[pathIdx])
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fullPath := filepath.Join(snapPath, name)
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info, _ := os.Stat(fullPath)
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createdAt := time.Time{}
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if info != nil {
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createdAt = info.ModTime()
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}
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snapshots = append(snapshots, &Snapshot{
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ID: fullPath,
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Backend: "btrfs",
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Name: name,
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Source: b.config.Subvolume,
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MountPoint: fullPath,
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CreatedAt: createdAt,
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Metadata: map[string]string{
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"subvolume": b.config.Subvolume,
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},
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})
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}
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return snapshots, nil
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}
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// listSnapshotsFromDir lists snapshots by scanning directory
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func (b *BtrfsBackend) listSnapshotsFromDir(ctx context.Context, snapPath string) ([]*Snapshot, error) {
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entries, err := os.ReadDir(snapPath)
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if err != nil {
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return nil, err
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}
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var snapshots []*Snapshot
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for _, entry := range entries {
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if !entry.IsDir() {
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continue
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}
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fullPath := filepath.Join(snapPath, entry.Name())
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// Check if it's a subvolume
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cmd := exec.CommandContext(ctx, "btrfs", "subvolume", "show", fullPath)
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if err := cmd.Run(); err != nil {
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continue // Not a subvolume
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}
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info, _ := entry.Info()
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createdAt := time.Time{}
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if info != nil {
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createdAt = info.ModTime()
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}
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snapshots = append(snapshots, &Snapshot{
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ID: fullPath,
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Backend: "btrfs",
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Name: entry.Name(),
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Source: b.config.Subvolume,
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MountPoint: fullPath,
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CreatedAt: createdAt,
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Metadata: map[string]string{
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"subvolume": b.config.Subvolume,
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},
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})
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}
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return snapshots, nil
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}
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// SendSnapshot sends a Btrfs snapshot (for efficient transfer)
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func (b *BtrfsBackend) SendSnapshot(ctx context.Context, snap *Snapshot) (*exec.Cmd, error) {
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// btrfs send <snapshot>
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cmd := exec.CommandContext(ctx, "btrfs", "send", snap.ID)
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return cmd, nil
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}
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// ReceiveSnapshot receives a Btrfs snapshot stream
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func (b *BtrfsBackend) ReceiveSnapshot(ctx context.Context, destPath string) (*exec.Cmd, error) {
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// btrfs receive <path>
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cmd := exec.CommandContext(ctx, "btrfs", "receive", destPath)
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return cmd, nil
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}
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// GetBtrfsSubvolume returns the subvolume info for a path
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func GetBtrfsSubvolume(path string) (string, error) {
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cmd := exec.Command("btrfs", "subvolume", "show", path)
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output, err := cmd.Output()
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if err != nil {
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return "", err
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}
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// First line contains the subvolume path
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lines := strings.Split(string(output), "\n")
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if len(lines) > 0 {
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return strings.TrimSpace(lines[0]), nil
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}
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return "", fmt.Errorf("could not parse subvolume info")
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}
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// GetBtrfsDeviceFreeSpace returns free space on the Btrfs device
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func GetBtrfsDeviceFreeSpace(path string) (int64, error) {
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cmd := exec.Command("btrfs", "filesystem", "usage", "-b", path)
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output, err := cmd.Output()
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if err != nil {
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return 0, err
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}
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// Look for "Free (estimated)" line
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lines := strings.Split(string(output), "\n")
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for _, line := range lines {
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if strings.Contains(line, "Free (estimated)") {
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fields := strings.Fields(line)
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for _, f := range fields {
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// Try to parse as number
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if size, err := strconv.ParseInt(f, 10, 64); err == nil {
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return size, nil
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}
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}
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}
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}
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return 0, fmt.Errorf("could not determine free space")
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}
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356
internal/engine/snapshot/lvm.go
Normal file
356
internal/engine/snapshot/lvm.go
Normal file
@@ -0,0 +1,356 @@
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package snapshot
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import (
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"context"
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"fmt"
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"os/exec"
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"regexp"
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"strconv"
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"strings"
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"time"
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)
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// LVMBackend implements snapshot Backend for LVM
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type LVMBackend struct {
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config *LVMConfig
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}
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// NewLVMBackend creates a new LVM backend
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func NewLVMBackend(config *LVMConfig) *LVMBackend {
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return &LVMBackend{
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config: config,
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}
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}
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// Name returns the backend name
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func (l *LVMBackend) Name() string {
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return "lvm"
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}
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// Detect checks if the path is on an LVM volume
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func (l *LVMBackend) Detect(dataDir string) (bool, error) {
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// Check if lvm tools are available
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if _, err := exec.LookPath("lvs"); err != nil {
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return false, nil
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}
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// Get the device for the path
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device, err := getDeviceForPath(dataDir)
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if err != nil {
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return false, nil
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}
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// Check if device is an LVM logical volume
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cmd := exec.Command("lvs", "--noheadings", "-o", "vg_name,lv_name", device)
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output, err := cmd.Output()
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if err != nil {
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return false, nil
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}
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result := strings.TrimSpace(string(output))
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if result == "" {
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return false, nil
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}
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// Parse VG and LV names
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fields := strings.Fields(result)
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if len(fields) >= 2 && l.config != nil {
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l.config.VolumeGroup = fields[0]
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l.config.LogicalVolume = fields[1]
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}
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return true, nil
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}
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// CreateSnapshot creates an LVM snapshot
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func (l *LVMBackend) CreateSnapshot(ctx context.Context, opts SnapshotOptions) (*Snapshot, error) {
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if l.config == nil {
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return nil, fmt.Errorf("LVM config not set")
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}
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if l.config.VolumeGroup == "" || l.config.LogicalVolume == "" {
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return nil, fmt.Errorf("volume group and logical volume required")
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}
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// Generate snapshot name
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snapName := opts.Name
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if snapName == "" {
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snapName = fmt.Sprintf("%s_snap_%s", l.config.LogicalVolume, time.Now().Format("20060102_150405"))
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}
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// Determine snapshot size (default: 10G)
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snapSize := opts.Size
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if snapSize == "" {
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snapSize = l.config.SnapshotSize
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}
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if snapSize == "" {
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snapSize = "10G"
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}
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// Source LV path
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sourceLV := fmt.Sprintf("/dev/%s/%s", l.config.VolumeGroup, l.config.LogicalVolume)
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// Create snapshot
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// lvcreate --snapshot --name <snap_name> --size <size> <source_lv>
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args := []string{
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"--snapshot",
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"--name", snapName,
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"--size", snapSize,
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sourceLV,
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}
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if opts.ReadOnly {
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args = append([]string{"--permission", "r"}, args...)
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}
|
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|
||||
cmd := exec.CommandContext(ctx, "lvcreate", args...)
|
||||
output, err := cmd.CombinedOutput()
|
||||
if err != nil {
|
||||
return nil, fmt.Errorf("lvcreate failed: %s: %w", string(output), err)
|
||||
}
|
||||
|
||||
return &Snapshot{
|
||||
ID: snapName,
|
||||
Backend: "lvm",
|
||||
Source: sourceLV,
|
||||
Name: snapName,
|
||||
CreatedAt: time.Now(),
|
||||
Metadata: map[string]string{
|
||||
"volume_group": l.config.VolumeGroup,
|
||||
"logical_volume": snapName,
|
||||
"source_lv": l.config.LogicalVolume,
|
||||
"snapshot_size": snapSize,
|
||||
},
|
||||
}, nil
|
||||
}
|
||||
|
||||
// MountSnapshot mounts an LVM snapshot
|
||||
func (l *LVMBackend) MountSnapshot(ctx context.Context, snap *Snapshot, mountPoint string) error {
|
||||
// Snapshot device path
|
||||
snapDevice := fmt.Sprintf("/dev/%s/%s", l.config.VolumeGroup, snap.Name)
|
||||
|
||||
// Create mount point
|
||||
if err := exec.CommandContext(ctx, "mkdir", "-p", mountPoint).Run(); err != nil {
|
||||
return fmt.Errorf("failed to create mount point: %w", err)
|
||||
}
|
||||
|
||||
// Mount (read-only, nouuid for XFS)
|
||||
args := []string{"-o", "ro,nouuid", snapDevice, mountPoint}
|
||||
cmd := exec.CommandContext(ctx, "mount", args...)
|
||||
output, err := cmd.CombinedOutput()
|
||||
if err != nil {
|
||||
// Try without nouuid (for non-XFS)
|
||||
args = []string{"-o", "ro", snapDevice, mountPoint}
|
||||
cmd = exec.CommandContext(ctx, "mount", args...)
|
||||
output, err = cmd.CombinedOutput()
|
||||
if err != nil {
|
||||
return fmt.Errorf("mount failed: %s: %w", string(output), err)
|
||||
}
|
||||
}
|
||||
|
||||
snap.MountPoint = mountPoint
|
||||
return nil
|
||||
}
|
||||
|
||||
// UnmountSnapshot unmounts an LVM snapshot
|
||||
func (l *LVMBackend) UnmountSnapshot(ctx context.Context, snap *Snapshot) error {
|
||||
if snap.MountPoint == "" {
|
||||
return nil
|
||||
}
|
||||
|
||||
// Try to unmount, retry a few times
|
||||
for i := 0; i < 3; i++ {
|
||||
cmd := exec.CommandContext(ctx, "umount", snap.MountPoint)
|
||||
if err := cmd.Run(); err == nil {
|
||||
snap.MountPoint = ""
|
||||
return nil
|
||||
}
|
||||
|
||||
// Wait before retry
|
||||
select {
|
||||
case <-ctx.Done():
|
||||
return ctx.Err()
|
||||
case <-time.After(time.Second):
|
||||
}
|
||||
}
|
||||
|
||||
// Force unmount as last resort
|
||||
cmd := exec.CommandContext(ctx, "umount", "-f", snap.MountPoint)
|
||||
if err := cmd.Run(); err != nil {
|
||||
return fmt.Errorf("failed to unmount snapshot: %w", err)
|
||||
}
|
||||
|
||||
snap.MountPoint = ""
|
||||
return nil
|
||||
}
|
||||
|
||||
// RemoveSnapshot deletes an LVM snapshot
|
||||
func (l *LVMBackend) RemoveSnapshot(ctx context.Context, snap *Snapshot) error {
|
||||
// Ensure unmounted
|
||||
if snap.MountPoint != "" {
|
||||
if err := l.UnmountSnapshot(ctx, snap); err != nil {
|
||||
return fmt.Errorf("failed to unmount before removal: %w", err)
|
||||
}
|
||||
}
|
||||
|
||||
// Remove snapshot
|
||||
// lvremove -f /dev/<vg>/<snap>
|
||||
snapDevice := fmt.Sprintf("/dev/%s/%s", l.config.VolumeGroup, snap.Name)
|
||||
cmd := exec.CommandContext(ctx, "lvremove", "-f", snapDevice)
|
||||
output, err := cmd.CombinedOutput()
|
||||
if err != nil {
|
||||
return fmt.Errorf("lvremove failed: %s: %w", string(output), err)
|
||||
}
|
||||
|
||||
return nil
|
||||
}
|
||||
|
||||
// GetSnapshotSize returns the actual COW data size
|
||||
func (l *LVMBackend) GetSnapshotSize(ctx context.Context, snap *Snapshot) (int64, error) {
|
||||
// lvs --noheadings -o data_percent,lv_size <snap_device>
|
||||
snapDevice := fmt.Sprintf("/dev/%s/%s", l.config.VolumeGroup, snap.Name)
|
||||
cmd := exec.CommandContext(ctx, "lvs", "--noheadings", "-o", "snap_percent,lv_size", "--units", "b", snapDevice)
|
||||
output, err := cmd.Output()
|
||||
if err != nil {
|
||||
return 0, err
|
||||
}
|
||||
|
||||
fields := strings.Fields(string(output))
|
||||
if len(fields) < 2 {
|
||||
return 0, fmt.Errorf("unexpected lvs output")
|
||||
}
|
||||
|
||||
// Parse percentage and size
|
||||
percentStr := strings.TrimSuffix(fields[0], "%")
|
||||
sizeStr := strings.TrimSuffix(fields[1], "B")
|
||||
|
||||
percent, _ := strconv.ParseFloat(percentStr, 64)
|
||||
size, _ := strconv.ParseInt(sizeStr, 10, 64)
|
||||
|
||||
// Calculate actual used size
|
||||
usedSize := int64(float64(size) * percent / 100)
|
||||
snap.Size = usedSize
|
||||
return usedSize, nil
|
||||
}
|
||||
|
||||
// ListSnapshots lists all LVM snapshots in the volume group
|
||||
func (l *LVMBackend) ListSnapshots(ctx context.Context) ([]*Snapshot, error) {
|
||||
if l.config == nil || l.config.VolumeGroup == "" {
|
||||
return nil, fmt.Errorf("volume group not configured")
|
||||
}
|
||||
|
||||
// lvs --noheadings -o lv_name,origin,lv_time --select 'lv_attr=~[^s]' <vg>
|
||||
cmd := exec.CommandContext(ctx, "lvs", "--noheadings",
|
||||
"-o", "lv_name,origin,lv_time",
|
||||
"--select", "lv_attr=~[^s]",
|
||||
l.config.VolumeGroup)
|
||||
output, err := cmd.Output()
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
|
||||
var snapshots []*Snapshot
|
||||
lines := strings.Split(string(output), "\n")
|
||||
for _, line := range lines {
|
||||
fields := strings.Fields(line)
|
||||
if len(fields) < 3 {
|
||||
continue
|
||||
}
|
||||
|
||||
snapshots = append(snapshots, &Snapshot{
|
||||
ID: fields[0],
|
||||
Backend: "lvm",
|
||||
Name: fields[0],
|
||||
Source: fields[1],
|
||||
CreatedAt: parseTime(fields[2]),
|
||||
Metadata: map[string]string{
|
||||
"volume_group": l.config.VolumeGroup,
|
||||
},
|
||||
})
|
||||
}
|
||||
|
||||
return snapshots, nil
|
||||
}
|
||||
|
||||
// getDeviceForPath returns the device path for a given filesystem path
|
||||
func getDeviceForPath(path string) (string, error) {
|
||||
cmd := exec.Command("df", "--output=source", path)
|
||||
output, err := cmd.Output()
|
||||
if err != nil {
|
||||
return "", err
|
||||
}
|
||||
|
||||
lines := strings.Split(string(output), "\n")
|
||||
if len(lines) < 2 {
|
||||
return "", fmt.Errorf("unexpected df output")
|
||||
}
|
||||
|
||||
device := strings.TrimSpace(lines[1])
|
||||
|
||||
// Resolve any symlinks (e.g., /dev/mapper/* -> /dev/vg/lv)
|
||||
resolved, err := exec.Command("readlink", "-f", device).Output()
|
||||
if err == nil {
|
||||
device = strings.TrimSpace(string(resolved))
|
||||
}
|
||||
|
||||
return device, nil
|
||||
}
|
||||
|
||||
// parseTime parses LVM time format
|
||||
func parseTime(s string) time.Time {
|
||||
// LVM uses format like "2024-01-15 10:30:00 +0000"
|
||||
layouts := []string{
|
||||
"2006-01-02 15:04:05 -0700",
|
||||
"2006-01-02 15:04:05",
|
||||
time.RFC3339,
|
||||
}
|
||||
|
||||
for _, layout := range layouts {
|
||||
if t, err := time.Parse(layout, s); err == nil {
|
||||
return t
|
||||
}
|
||||
}
|
||||
|
||||
return time.Time{}
|
||||
}
|
||||
|
||||
// GetLVMInfo returns VG and LV names for a device
|
||||
func GetLVMInfo(device string) (vg, lv string, err error) {
|
||||
cmd := exec.Command("lvs", "--noheadings", "-o", "vg_name,lv_name", device)
|
||||
output, err := cmd.Output()
|
||||
if err != nil {
|
||||
return "", "", err
|
||||
}
|
||||
|
||||
fields := strings.Fields(string(output))
|
||||
if len(fields) < 2 {
|
||||
return "", "", fmt.Errorf("device is not an LVM volume")
|
||||
}
|
||||
|
||||
return fields[0], fields[1], nil
|
||||
}
|
||||
|
||||
// GetVolumeGroupFreeSpace returns free space in volume group
|
||||
func GetVolumeGroupFreeSpace(vg string) (int64, error) {
|
||||
cmd := exec.Command("vgs", "--noheadings", "-o", "vg_free", "--units", "b", vg)
|
||||
output, err := cmd.Output()
|
||||
if err != nil {
|
||||
return 0, err
|
||||
}
|
||||
|
||||
sizeStr := strings.TrimSpace(string(output))
|
||||
sizeStr = strings.TrimSuffix(sizeStr, "B")
|
||||
|
||||
// Remove any non-numeric prefix/suffix
|
||||
re := regexp.MustCompile(`[\d.]+`)
|
||||
match := re.FindString(sizeStr)
|
||||
if match == "" {
|
||||
return 0, fmt.Errorf("could not parse size: %s", sizeStr)
|
||||
}
|
||||
|
||||
size, err := strconv.ParseInt(match, 10, 64)
|
||||
if err != nil {
|
||||
return 0, err
|
||||
}
|
||||
|
||||
return size, nil
|
||||
}
|
||||
138
internal/engine/snapshot/snapshot.go
Normal file
138
internal/engine/snapshot/snapshot.go
Normal file
@@ -0,0 +1,138 @@
|
||||
package snapshot
|
||||
|
||||
import (
|
||||
"context"
|
||||
"fmt"
|
||||
"time"
|
||||
)
|
||||
|
||||
// Backend is the interface for snapshot-capable filesystems
|
||||
type Backend interface {
|
||||
// Name returns the backend name (e.g., "lvm", "zfs", "btrfs")
|
||||
Name() string
|
||||
|
||||
// Detect checks if this backend is available for the given path
|
||||
Detect(dataDir string) (bool, error)
|
||||
|
||||
// CreateSnapshot creates a new snapshot
|
||||
CreateSnapshot(ctx context.Context, opts SnapshotOptions) (*Snapshot, error)
|
||||
|
||||
// MountSnapshot mounts a snapshot at the given path
|
||||
MountSnapshot(ctx context.Context, snap *Snapshot, mountPoint string) error
|
||||
|
||||
// UnmountSnapshot unmounts a snapshot
|
||||
UnmountSnapshot(ctx context.Context, snap *Snapshot) error
|
||||
|
||||
// RemoveSnapshot deletes a snapshot
|
||||
RemoveSnapshot(ctx context.Context, snap *Snapshot) error
|
||||
|
||||
// GetSnapshotSize returns the actual size of snapshot data (COW data)
|
||||
GetSnapshotSize(ctx context.Context, snap *Snapshot) (int64, error)
|
||||
|
||||
// ListSnapshots lists all snapshots
|
||||
ListSnapshots(ctx context.Context) ([]*Snapshot, error)
|
||||
}
|
||||
|
||||
// Snapshot represents a filesystem snapshot
|
||||
type Snapshot struct {
|
||||
ID string // Unique identifier (e.g., LV name, ZFS snapshot name)
|
||||
Backend string // "lvm", "zfs", "btrfs"
|
||||
Source string // Original path/volume
|
||||
Name string // Snapshot name
|
||||
MountPoint string // Where it's mounted (if mounted)
|
||||
CreatedAt time.Time // Creation time
|
||||
Size int64 // Actual size (COW data)
|
||||
Metadata map[string]string // Additional backend-specific metadata
|
||||
}
|
||||
|
||||
// SnapshotOptions contains options for creating a snapshot
|
||||
type SnapshotOptions struct {
|
||||
Name string // Snapshot name (auto-generated if empty)
|
||||
Size string // For LVM: COW space size (e.g., "10G")
|
||||
ReadOnly bool // Create as read-only
|
||||
Sync bool // Sync filesystem before snapshot
|
||||
}
|
||||
|
||||
// Config contains configuration for snapshot backups
|
||||
type Config struct {
|
||||
// Filesystem type (auto-detect if not set)
|
||||
Filesystem string // "auto", "lvm", "zfs", "btrfs"
|
||||
|
||||
// MySQL data directory
|
||||
DataDir string
|
||||
|
||||
// LVM specific
|
||||
LVM *LVMConfig
|
||||
|
||||
// ZFS specific
|
||||
ZFS *ZFSConfig
|
||||
|
||||
// Btrfs specific
|
||||
Btrfs *BtrfsConfig
|
||||
|
||||
// Post-snapshot handling
|
||||
MountPoint string // Where to mount the snapshot
|
||||
Compress bool // Compress when streaming
|
||||
Threads int // Parallel compression threads
|
||||
|
||||
// Cleanup
|
||||
AutoRemoveSnapshot bool // Remove snapshot after backup
|
||||
}
|
||||
|
||||
// LVMConfig contains LVM-specific settings
|
||||
type LVMConfig struct {
|
||||
VolumeGroup string // Volume group name
|
||||
LogicalVolume string // Logical volume name
|
||||
SnapshotSize string // Size for COW space (e.g., "10G")
|
||||
}
|
||||
|
||||
// ZFSConfig contains ZFS-specific settings
|
||||
type ZFSConfig struct {
|
||||
Dataset string // ZFS dataset name
|
||||
}
|
||||
|
||||
// BtrfsConfig contains Btrfs-specific settings
|
||||
type BtrfsConfig struct {
|
||||
Subvolume string // Subvolume path
|
||||
SnapshotPath string // Where to create snapshots
|
||||
}
|
||||
|
||||
// BinlogPosition represents MySQL binlog position at snapshot time
|
||||
type BinlogPosition struct {
|
||||
File string
|
||||
Position int64
|
||||
GTID string
|
||||
}
|
||||
|
||||
// DetectBackend auto-detects the filesystem backend for a given path
|
||||
func DetectBackend(dataDir string) (Backend, error) {
|
||||
// Try each backend in order of preference
|
||||
backends := []Backend{
|
||||
NewZFSBackend(nil),
|
||||
NewLVMBackend(nil),
|
||||
NewBtrfsBackend(nil),
|
||||
}
|
||||
|
||||
for _, backend := range backends {
|
||||
detected, err := backend.Detect(dataDir)
|
||||
if err == nil && detected {
|
||||
return backend, nil
|
||||
}
|
||||
}
|
||||
|
||||
return nil, fmt.Errorf("no supported snapshot filesystem detected for %s", dataDir)
|
||||
}
|
||||
|
||||
// FormatSize returns human-readable size
|
||||
func FormatSize(bytes int64) string {
|
||||
const unit = 1024
|
||||
if bytes < unit {
|
||||
return fmt.Sprintf("%d B", bytes)
|
||||
}
|
||||
div, exp := int64(unit), 0
|
||||
for n := bytes / unit; n >= unit; n /= unit {
|
||||
div *= unit
|
||||
exp++
|
||||
}
|
||||
return fmt.Sprintf("%.1f %cB", float64(bytes)/float64(div), "KMGTPE"[exp])
|
||||
}
|
||||
328
internal/engine/snapshot/zfs.go
Normal file
328
internal/engine/snapshot/zfs.go
Normal file
@@ -0,0 +1,328 @@
|
||||
package snapshot
|
||||
|
||||
import (
|
||||
"context"
|
||||
"fmt"
|
||||
"os/exec"
|
||||
"strconv"
|
||||
"strings"
|
||||
"time"
|
||||
)
|
||||
|
||||
// ZFSBackend implements snapshot Backend for ZFS
|
||||
type ZFSBackend struct {
|
||||
config *ZFSConfig
|
||||
}
|
||||
|
||||
// NewZFSBackend creates a new ZFS backend
|
||||
func NewZFSBackend(config *ZFSConfig) *ZFSBackend {
|
||||
return &ZFSBackend{
|
||||
config: config,
|
||||
}
|
||||
}
|
||||
|
||||
// Name returns the backend name
|
||||
func (z *ZFSBackend) Name() string {
|
||||
return "zfs"
|
||||
}
|
||||
|
||||
// Detect checks if the path is on a ZFS dataset
|
||||
func (z *ZFSBackend) Detect(dataDir string) (bool, error) {
|
||||
// Check if zfs tools are available
|
||||
if _, err := exec.LookPath("zfs"); err != nil {
|
||||
return false, nil
|
||||
}
|
||||
|
||||
// Check if path is on ZFS
|
||||
cmd := exec.Command("df", "-T", dataDir)
|
||||
output, err := cmd.Output()
|
||||
if err != nil {
|
||||
return false, nil
|
||||
}
|
||||
|
||||
if !strings.Contains(string(output), "zfs") {
|
||||
return false, nil
|
||||
}
|
||||
|
||||
// Get dataset name
|
||||
cmd = exec.Command("zfs", "list", "-H", "-o", "name", dataDir)
|
||||
output, err = cmd.Output()
|
||||
if err != nil {
|
||||
return false, nil
|
||||
}
|
||||
|
||||
dataset := strings.TrimSpace(string(output))
|
||||
if dataset == "" {
|
||||
return false, nil
|
||||
}
|
||||
|
||||
if z.config != nil {
|
||||
z.config.Dataset = dataset
|
||||
}
|
||||
|
||||
return true, nil
|
||||
}
|
||||
|
||||
// CreateSnapshot creates a ZFS snapshot
|
||||
func (z *ZFSBackend) CreateSnapshot(ctx context.Context, opts SnapshotOptions) (*Snapshot, error) {
|
||||
if z.config == nil || z.config.Dataset == "" {
|
||||
return nil, fmt.Errorf("ZFS dataset not configured")
|
||||
}
|
||||
|
||||
// Generate snapshot name
|
||||
snapName := opts.Name
|
||||
if snapName == "" {
|
||||
snapName = fmt.Sprintf("dbbackup_%s", time.Now().Format("20060102_150405"))
|
||||
}
|
||||
|
||||
// Full snapshot name: dataset@snapshot
|
||||
fullName := fmt.Sprintf("%s@%s", z.config.Dataset, snapName)
|
||||
|
||||
// Optionally sync filesystem first
|
||||
if opts.Sync {
|
||||
cmd := exec.CommandContext(ctx, "sync")
|
||||
cmd.Run()
|
||||
}
|
||||
|
||||
// Create snapshot
|
||||
// zfs snapshot [-r] <dataset>@<name>
|
||||
cmd := exec.CommandContext(ctx, "zfs", "snapshot", fullName)
|
||||
output, err := cmd.CombinedOutput()
|
||||
if err != nil {
|
||||
return nil, fmt.Errorf("zfs snapshot failed: %s: %w", string(output), err)
|
||||
}
|
||||
|
||||
return &Snapshot{
|
||||
ID: fullName,
|
||||
Backend: "zfs",
|
||||
Source: z.config.Dataset,
|
||||
Name: snapName,
|
||||
CreatedAt: time.Now(),
|
||||
Metadata: map[string]string{
|
||||
"dataset": z.config.Dataset,
|
||||
"full_name": fullName,
|
||||
},
|
||||
}, nil
|
||||
}
|
||||
|
||||
// MountSnapshot mounts a ZFS snapshot (creates a clone)
|
||||
func (z *ZFSBackend) MountSnapshot(ctx context.Context, snap *Snapshot, mountPoint string) error {
|
||||
// ZFS snapshots can be accessed directly at .zfs/snapshot/<name>
|
||||
// Or we can clone them for writable access
|
||||
// For backup purposes, we use the direct access method
|
||||
|
||||
// The snapshot is already accessible at <mountpoint>/.zfs/snapshot/<name>
|
||||
// We just need to find the current mountpoint of the dataset
|
||||
cmd := exec.CommandContext(ctx, "zfs", "list", "-H", "-o", "mountpoint", z.config.Dataset)
|
||||
output, err := cmd.Output()
|
||||
if err != nil {
|
||||
return fmt.Errorf("failed to get dataset mountpoint: %w", err)
|
||||
}
|
||||
|
||||
datasetMount := strings.TrimSpace(string(output))
|
||||
snap.MountPoint = fmt.Sprintf("%s/.zfs/snapshot/%s", datasetMount, snap.Name)
|
||||
|
||||
// If a specific mount point is requested, create a bind mount
|
||||
if mountPoint != snap.MountPoint {
|
||||
// Create mount point
|
||||
if err := exec.CommandContext(ctx, "mkdir", "-p", mountPoint).Run(); err != nil {
|
||||
return fmt.Errorf("failed to create mount point: %w", err)
|
||||
}
|
||||
|
||||
// Bind mount
|
||||
cmd := exec.CommandContext(ctx, "mount", "--bind", snap.MountPoint, mountPoint)
|
||||
output, err := cmd.CombinedOutput()
|
||||
if err != nil {
|
||||
return fmt.Errorf("bind mount failed: %s: %w", string(output), err)
|
||||
}
|
||||
|
||||
snap.MountPoint = mountPoint
|
||||
snap.Metadata["bind_mount"] = "true"
|
||||
}
|
||||
|
||||
return nil
|
||||
}
|
||||
|
||||
// UnmountSnapshot unmounts a ZFS snapshot
|
||||
func (z *ZFSBackend) UnmountSnapshot(ctx context.Context, snap *Snapshot) error {
|
||||
// Only unmount if we created a bind mount
|
||||
if snap.Metadata["bind_mount"] == "true" && snap.MountPoint != "" {
|
||||
cmd := exec.CommandContext(ctx, "umount", snap.MountPoint)
|
||||
if err := cmd.Run(); err != nil {
|
||||
// Try force unmount
|
||||
cmd = exec.CommandContext(ctx, "umount", "-f", snap.MountPoint)
|
||||
if err := cmd.Run(); err != nil {
|
||||
return fmt.Errorf("failed to unmount: %w", err)
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
snap.MountPoint = ""
|
||||
return nil
|
||||
}
|
||||
|
||||
// RemoveSnapshot deletes a ZFS snapshot
|
||||
func (z *ZFSBackend) RemoveSnapshot(ctx context.Context, snap *Snapshot) error {
|
||||
// Ensure unmounted
|
||||
if snap.MountPoint != "" {
|
||||
if err := z.UnmountSnapshot(ctx, snap); err != nil {
|
||||
return fmt.Errorf("failed to unmount before removal: %w", err)
|
||||
}
|
||||
}
|
||||
|
||||
// Get full name
|
||||
fullName := snap.ID
|
||||
if !strings.Contains(fullName, "@") {
|
||||
fullName = fmt.Sprintf("%s@%s", z.config.Dataset, snap.Name)
|
||||
}
|
||||
|
||||
// Remove snapshot
|
||||
// zfs destroy <dataset>@<name>
|
||||
cmd := exec.CommandContext(ctx, "zfs", "destroy", fullName)
|
||||
output, err := cmd.CombinedOutput()
|
||||
if err != nil {
|
||||
return fmt.Errorf("zfs destroy failed: %s: %w", string(output), err)
|
||||
}
|
||||
|
||||
return nil
|
||||
}
|
||||
|
||||
// GetSnapshotSize returns the space used by the snapshot
|
||||
func (z *ZFSBackend) GetSnapshotSize(ctx context.Context, snap *Snapshot) (int64, error) {
|
||||
fullName := snap.ID
|
||||
if !strings.Contains(fullName, "@") {
|
||||
fullName = fmt.Sprintf("%s@%s", z.config.Dataset, snap.Name)
|
||||
}
|
||||
|
||||
// zfs list -H -o used <snapshot>
|
||||
cmd := exec.CommandContext(ctx, "zfs", "list", "-H", "-o", "used", "-p", fullName)
|
||||
output, err := cmd.Output()
|
||||
if err != nil {
|
||||
return 0, err
|
||||
}
|
||||
|
||||
sizeStr := strings.TrimSpace(string(output))
|
||||
size, err := strconv.ParseInt(sizeStr, 10, 64)
|
||||
if err != nil {
|
||||
return 0, fmt.Errorf("failed to parse size: %w", err)
|
||||
}
|
||||
|
||||
snap.Size = size
|
||||
return size, nil
|
||||
}
|
||||
|
||||
// ListSnapshots lists all snapshots for the dataset
|
||||
func (z *ZFSBackend) ListSnapshots(ctx context.Context) ([]*Snapshot, error) {
|
||||
if z.config == nil || z.config.Dataset == "" {
|
||||
return nil, fmt.Errorf("ZFS dataset not configured")
|
||||
}
|
||||
|
||||
// zfs list -H -t snapshot -o name,creation,used <dataset>
|
||||
cmd := exec.CommandContext(ctx, "zfs", "list", "-H", "-t", "snapshot",
|
||||
"-o", "name,creation,used", "-r", z.config.Dataset)
|
||||
output, err := cmd.Output()
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
|
||||
var snapshots []*Snapshot
|
||||
lines := strings.Split(string(output), "\n")
|
||||
for _, line := range lines {
|
||||
fields := strings.Fields(line)
|
||||
if len(fields) < 3 {
|
||||
continue
|
||||
}
|
||||
|
||||
fullName := fields[0]
|
||||
parts := strings.Split(fullName, "@")
|
||||
if len(parts) != 2 {
|
||||
continue
|
||||
}
|
||||
|
||||
size, _ := strconv.ParseInt(fields[2], 10, 64)
|
||||
|
||||
snapshots = append(snapshots, &Snapshot{
|
||||
ID: fullName,
|
||||
Backend: "zfs",
|
||||
Name: parts[1],
|
||||
Source: parts[0],
|
||||
CreatedAt: parseZFSTime(fields[1]),
|
||||
Size: size,
|
||||
Metadata: map[string]string{
|
||||
"dataset": z.config.Dataset,
|
||||
"full_name": fullName,
|
||||
},
|
||||
})
|
||||
}
|
||||
|
||||
return snapshots, nil
|
||||
}
|
||||
|
||||
// SendSnapshot streams a ZFS snapshot (for efficient transfer)
|
||||
func (z *ZFSBackend) SendSnapshot(ctx context.Context, snap *Snapshot) (*exec.Cmd, error) {
|
||||
fullName := snap.ID
|
||||
if !strings.Contains(fullName, "@") {
|
||||
fullName = fmt.Sprintf("%s@%s", z.config.Dataset, snap.Name)
|
||||
}
|
||||
|
||||
// zfs send <snapshot>
|
||||
cmd := exec.CommandContext(ctx, "zfs", "send", fullName)
|
||||
return cmd, nil
|
||||
}
|
||||
|
||||
// ReceiveSnapshot receives a ZFS snapshot stream
|
||||
func (z *ZFSBackend) ReceiveSnapshot(ctx context.Context, dataset string) (*exec.Cmd, error) {
|
||||
// zfs receive <dataset>
|
||||
cmd := exec.CommandContext(ctx, "zfs", "receive", dataset)
|
||||
return cmd, nil
|
||||
}
|
||||
|
||||
// parseZFSTime parses ZFS creation time
|
||||
func parseZFSTime(s string) time.Time {
|
||||
// ZFS uses different formats depending on version
|
||||
layouts := []string{
|
||||
"Mon Jan 2 15:04 2006",
|
||||
"2006-01-02 15:04",
|
||||
time.RFC3339,
|
||||
}
|
||||
|
||||
for _, layout := range layouts {
|
||||
if t, err := time.Parse(layout, s); err == nil {
|
||||
return t
|
||||
}
|
||||
}
|
||||
|
||||
return time.Time{}
|
||||
}
|
||||
|
||||
// GetZFSDataset returns the ZFS dataset for a given path
|
||||
func GetZFSDataset(path string) (string, error) {
|
||||
cmd := exec.Command("zfs", "list", "-H", "-o", "name", path)
|
||||
output, err := cmd.Output()
|
||||
if err != nil {
|
||||
return "", err
|
||||
}
|
||||
|
||||
return strings.TrimSpace(string(output)), nil
|
||||
}
|
||||
|
||||
// GetZFSPoolFreeSpace returns free space in the pool
|
||||
func GetZFSPoolFreeSpace(dataset string) (int64, error) {
|
||||
// Get pool name from dataset
|
||||
parts := strings.Split(dataset, "/")
|
||||
pool := parts[0]
|
||||
|
||||
cmd := exec.Command("zpool", "list", "-H", "-o", "free", "-p", pool)
|
||||
output, err := cmd.Output()
|
||||
if err != nil {
|
||||
return 0, err
|
||||
}
|
||||
|
||||
sizeStr := strings.TrimSpace(string(output))
|
||||
size, err := strconv.ParseInt(sizeStr, 10, 64)
|
||||
if err != nil {
|
||||
return 0, err
|
||||
}
|
||||
|
||||
return size, nil
|
||||
}
|
||||
Reference in New Issue
Block a user