/
functions.go
260 lines (230 loc) · 6.35 KB
/
functions.go
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package main
import (
"errors"
"os"
"strings"
"time"
"github.com/theairkit/runcmd"
"github.com/theairkit/zfs"
)
type Backuper struct {
srcZfs *zfs.Zfs
dstZfs *zfs.Zfs
config *Config
snapSuff string
}
type BackupTask struct {
id int
src string
dst string
dstroot string
expire string
srcZfs *zfs.Zfs
dstZfs *zfs.Zfs
snapSuff string
}
var (
errPrefix = "'remote_prefix' and 'recursive' are mutually exclusive; skip this [[backup]] section"
errPrefixMask = "'remote_prefix' and 'regexp' are mutually exclusive; skip this [[backup]] section"
errRegex = "'regexp' and 'recursive=true' are mutually exclusive; skip this [[backup]] section"
warnPrefixFs = "'remote_prefix' set; fs with this name on remote may be overwritten"
warnExpire = "expire_hours not set, will not delete old backups"
snapExist = "already exists, wait next minute and run again"
timeFormat = "2006-01-02T15:04"
snapCurr = "zbackup_curr_"
snapNew = "zbackup_new_"
PROPERTY = "zbackup:"
h, _ = os.Hostname()
)
func NewBackuper(c *Config, snapSuff string) (*Backuper, error) {
srcZfs, err := zfs.NewZfs(runcmd.NewLocalRunner())
if err != nil {
return nil, err
}
dstZfs, err := zfs.NewZfs(runcmd.NewRemoteKeyAuthRunner(c.User, c.Host, c.Key))
if err != nil {
return nil, err
}
return &Backuper{srcZfs, dstZfs, c, snapSuff}, nil
}
func (backuper *Backuper) setupTasks() []BackupTask {
tasks := make([]BackupTask, 0)
taskid := 0
config := backuper.config.Backup
for _, backup := range config {
if backup.RemotePrefix != "" && backup.Recursive {
log.Error("%s: %s", backup.Local, errPrefix)
continue
}
if backup.Recursive && strings.HasSuffix(backup.Local, "*") {
log.Error("%s: %s", backup.Local, errRegex)
continue
}
fsList, err := backuper.srcZfs.List(backup.Local, zfs.FS, backup.Recursive)
if err != nil {
log.Error("error get filesystems: %s", err.Error())
continue
}
for _, src := range fsList {
dst := backup.RemoteRoot + "/" + h + "-" + strings.Replace(src, "/", "-", -1)
if backup.RemotePrefix != "" {
dst = backup.RemoteRoot + "/" + backup.RemotePrefix
}
tasks = append(tasks, BackupTask{
taskid,
src,
dst,
backup.RemoteRoot,
backup.Expire,
backuper.srcZfs,
backuper.dstZfs,
backuper.snapSuff,
})
taskid++
}
}
return tasks
}
func (task *BackupTask) doBackup() error {
snapPostfix := time.Now().Format(timeFormat)
id := task.id
src := task.src
dst := task.dst
snapCurr += task.snapSuff
snapNew += task.snapSuff
// Check if snapshot with timestamp-based name already exists:
log.Debug("[%d]: check %s exists", id, dst+"@"+snapPostfix)
if exist, err := task.dstZfs.ExistSnap(dst, snapPostfix); err != nil || exist {
if err != nil {
return err
}
return errors.New(dst + "@" + snapPostfix + " " + snapExist)
}
// Check, if backup for the first time or not:
// @zbackup_curr not exist: create it and send
// @zbackup_curr exist: create @zbackup_new, and send delta between them
log.Debug("[%d]: check %s exists", id, src+"@"+snapCurr)
if exist, err := task.srcZfs.ExistSnap(src, snapCurr); err != nil || !exist {
if err != nil {
return err
}
snapNew = ""
}
// Backup:
if err := task.backupHelper(snapNew); err != nil {
return err
}
// Cleanup:
return task.cleanExpired()
}
func (task *BackupTask) backupHelper(snapNew string) error {
snapPostfix := time.Now().Format(timeFormat)
id := task.id
src := task.src
dst := task.dst
snap := snapCurr
if snapNew != "" {
snap = snapNew
}
log.Debug("[%d]: create snapshot: %s...", id, snap)
if err := task.srcZfs.CreateSnap(src, snap); err != nil {
return err
}
log.Debug("[%d]: check, if %s exists...", id, task.dstroot)
exist, err := task.dstZfs.ExistFs(task.dstroot)
if err != nil {
return err
}
if !exist {
task.dstZfs.CreateFs(task.dstroot)
}
log.Debug("[%d]: start recieve snapshot on remote...", id)
cmdRecv, err := task.dstZfs.RecvSnap(dst, snapPostfix)
if err != nil {
return err
}
log.Debug("[%d]: copy snapshot from local to remote...", id)
cmdSend, err := task.srcZfs.SendSnap(src, snapCurr, snapNew, cmdRecv)
if err != nil {
return err
}
if err := cmdSend.Wait(); err != nil {
return err
}
if err := cmdRecv.Wait(); err != nil {
return err
}
if snapNew != "" {
log.Debug("[%d]: rotate snapshots (destroy @curr, move @new to @curr)...", id)
if err := task.srcZfs.Destroy(src + "@" + snapCurr); err != nil {
return err
}
if err := task.srcZfs.RenameSnap(src, snapNew, snapCurr); err != nil {
return err
}
}
log.Debug("[%d]: set remote %s 'readonly'...", id, dst)
if err := task.dstZfs.SetProperty(dst, "readonly", "on"); err != nil {
return err
}
log.Debug("[%d]: set remote %s 'zbackup:=true'...", id, dst+snapPostfix)
return task.dstZfs.SetProperty(dst+"@"+snapPostfix, PROPERTY, "true")
}
func (task *BackupTask) cleanExpired() error {
id := task.id
dst := task.dst
expire := task.expire
log.Debug("[%d]: cleaning expired snapshots, expire: %s", id, expire)
if expire == "" {
log.Info("[%d]: expire is not set, exit", id)
return nil
}
recent, err := task.dstZfs.RecentSnap(dst, PROPERTY)
if err != nil {
return err
}
log.Debug("[%d]: get list remote snapshots...", id)
list, err := task.dstZfs.ListFsSnap(dst)
if err != nil {
return err
}
if len(list) == 1 {
log.Info("[%d] only one snapshot, nothing to delete", id)
return nil
}
for _, snap := range list {
out, err := task.dstZfs.Property(snap, "zbackup:")
if err != nil {
return err
}
if out != "true" {
log.Debug("[%d]: %s is not created by zbackup, skipping", id, snap)
continue
}
if task.expire == "lastone" {
if snap != recent {
log.Debug("[%d]: %s will be destroy (not recent)", id, snap)
if err := task.dstZfs.Destroy(snap); err != nil {
log.Error("[%d]: error destroying %s: %s", id, snap, err.Error())
}
}
continue
}
poolDate, _ := time.ParseInLocation(
timeFormat,
strings.Split(snap, "@")[1],
time.Local,
)
expire, _ := time.ParseDuration(expire)
if time.Since(poolDate) > expire {
log.Debug("[%d]: %s will be destroy (>%s)", id, snap, expire)
if err := task.dstZfs.Destroy(snap); err != nil {
log.Error("[%d]: error destroying %s: %s", id, snap, err.Error())
continue
}
} else {
log.Debug("[%d]: %s not exipred, skipping", id, snap)
}
}
return nil
}