commit d30cb6f304f44454a2209e5c311267bbb49d69a9
Author: shoopea <shoopea@siteop.biz>
Date:   Mon Oct 11 09:43:05 2021 +0800

    initial commit

diff --git a/backup.go b/backup.go
new file mode 100644
index 0000000..3883095
--- /dev/null
+++ b/backup.go
@@ -0,0 +1,557 @@
+package main
+
+import (
+	"bytes"
+	"encoding/csv"
+	"encoding/json"
+	"flag"
+	"fmt"
+	"io/ioutil"
+	"log"
+	"os"
+	"regexp"
+	"strings"
+	"time"
+
+	"golang.org/x/crypto/ssh"
+)
+
+type Config struct {
+	Zfsnap map[string]string    `json:"zfsnap"`
+	Box    map[string]BoxConfig `json:"box"`
+	Apps   []AppConfig          `json:apps`
+	ssh    map[string]*SSHConfig
+}
+
+type Location string
+
+type Snapshot string
+
+type AppConfig struct {
+	Name         string              `json:"name"`
+	Schedule     []string            `json:"schedule"`
+	Sources      []Location          `json:"src"`
+	Destinations []Location          `json:"dest"`
+	Before       map[string]Location `json:"before"`
+	After        map[string]Location `json:"after"`
+}
+type SSHConfig struct {
+	signer   ssh.Signer
+	config   *ssh.ClientConfig
+	client   *ssh.Client
+	logged   bool
+	name     string
+	zfs      map[string]string
+	snapshot []Snapshot
+}
+
+type BoxConfig struct {
+	Addr string `json:"addr"`
+	User string `json:"user"`
+	Key  string `json:"key"`
+}
+
+var (
+	cfgFile   = flag.String("config", "config.json", "config file")
+	schedFlag = flag.String("schedule", "", "specific schedule")
+	testFlag  = flag.Bool("test", true, "test run")
+	debugFlag = flag.Bool("debug", true, "debug")
+	cfg       Config
+)
+
+func (l Location) Box() string {
+	s := strings.Split(string(l), `:`)
+	return s[0]
+}
+
+func (l Location) Path() string {
+	s := strings.Split(string(l), `:`)
+	return s[1]
+}
+
+func (l Location) Valid() bool {
+	s := strings.Split(string(l), `:`)
+	return len(s) == 2
+}
+
+//Load config from file
+func (c *Config) Load() error {
+	b, err := ioutil.ReadFile(*cfgFile)
+	if err != nil {
+		if *debugFlag {
+			log.Printf("Config.Load : ioutil.ReadFile(%s) : %s", *cfgFile, err)
+		}
+		return err
+	}
+
+	err = json.Unmarshal(b, &c)
+	if err != nil {
+		if *debugFlag {
+			log.Printf("Config.Load : json.Unmarshal : %s", err)
+		}
+		return err
+	}
+
+	cfg.ssh = make(map[string]*SSHConfig)
+	for k, v := range c.Box {
+		s := &SSHConfig{
+			logged: false,
+			name:   k,
+		}
+		cfg.ssh[k] = s
+		keyRaw, err := ioutil.ReadFile(v.Key)
+		if err != nil {
+			if *debugFlag {
+				log.Printf("Config.Load : ioutil.ReadFile(%s) : %s", k, err)
+			}
+			return err
+		}
+
+		key, err := ssh.ParseRawPrivateKey(keyRaw)
+		if err != nil {
+			if *debugFlag {
+				log.Printf("Config.Load : ssh.ParseRawPrivateKey(%s) : %s", k, err)
+			}
+			return err
+		}
+
+		s.signer, err = ssh.NewSignerFromKey(key)
+		if err != nil {
+			if *debugFlag {
+				log.Printf("Config.Load : ssh.NewSignerFromKey(%s) : %s", k, err)
+			}
+			return err
+		}
+
+		s.config = &ssh.ClientConfig{
+			User: v.User,
+			Auth: []ssh.AuthMethod{
+				ssh.PublicKeys(s.signer),
+			},
+			HostKeyCallback: ssh.InsecureIgnoreHostKey(),
+		}
+
+		s.client, err = ssh.Dial("tcp", v.Addr, s.config)
+		if err != nil {
+			if *debugFlag {
+				log.Printf("Config.Load : ssh.Dial(%s) : %s", k, err)
+			}
+			return err
+		}
+
+		session, err := s.client.NewSession()
+		if err != nil {
+			if *debugFlag {
+				log.Printf("Config.Load : client.NewSession(%s) : %s", k, err)
+			}
+			return err
+		}
+
+		var b bytes.Buffer
+		session.Stdout = &b
+		err = session.Run("/usr/bin/uname -a")
+		if err != nil {
+			if *debugFlag {
+				log.Printf("Config.Load : client.NewSession(%s) : %s", k, err)
+			}
+			return err
+		}
+		if *debugFlag {
+			log.Printf("Config.Load : logged into %s : %s", k, b.String())
+		}
+		session.Close()
+		s.logged = true
+
+	}
+
+	for _, app := range c.Apps {
+		for _, src := range app.Sources {
+			if !src.Valid() {
+				return fmt.Errorf("Source not valid : %s", string(src))
+			}
+			if _, ok := cfg.ssh[src.Box()]; !ok {
+				return fmt.Errorf("No box defined for source : %s", string(src))
+			}
+		}
+		for _, dest := range app.Destinations {
+			if !dest.Valid() {
+				return fmt.Errorf("Destination not valid : %s", string(dest))
+			}
+			if _, ok := cfg.ssh[dest.Box()]; !ok {
+				return fmt.Errorf("No box defined for destination : %s", string(dest))
+			}
+		}
+		for val, before := range app.Before {
+			_, err = regexp.Compile(val)
+			if err != nil {
+				if *debugFlag {
+					log.Printf("Config.Load : invalid regex : %s", val)
+				}
+				return err
+			}
+			if !before.Valid() {
+				return fmt.Errorf("Before not valid : %s", string(before))
+			}
+			if _, ok := cfg.ssh[before.Box()]; !ok {
+				return fmt.Errorf("No box defined for before : %s", string(before))
+			}
+		}
+		for val, after := range app.After {
+			_, err = regexp.Compile(val)
+			if err != nil {
+				if *debugFlag {
+					log.Printf("Config.Load : invalid regex : %s", val)
+				}
+				return err
+			}
+			if !after.Valid() {
+				return fmt.Errorf("After not valid : %s", string(after))
+			}
+			if _, ok := cfg.ssh[after.Box()]; !ok {
+				return fmt.Errorf("No box defined for after : %s", string(after))
+			}
+		}
+	}
+
+	return nil
+}
+
+//Close config
+func (c *Config) Close() error {
+	return nil
+}
+
+func (s *SSHConfig) getSnapshotList() error {
+	if *debugFlag {
+		log.Printf("SSHConfig.getSnapshotList : Start %s", s.name)
+	}
+	if !s.logged {
+		return fmt.Errorf("Client %s not logged in.", s.name)
+	}
+
+	session, err := s.client.NewSession()
+	if err != nil {
+		if *debugFlag {
+			log.Printf("SSHConfig.getSnapshotList : client.NewSession(%s) : %s", s.name, err)
+		}
+		return err
+	}
+
+	var b bytes.Buffer
+	session.Stdout = &b
+	err = session.Run("/usr/sbin/zfs list -H -t snapshot -o name")
+	if err != nil {
+		if *debugFlag {
+			log.Printf("SSHConfig.getSnapshotList : session.Run(%s) : %s", s.name, err)
+		}
+		return err
+	}
+
+	s.snapshot = make([]Snapshot, 0)
+
+	csvReader := csv.NewReader(&b)
+	csvReader.Comma = '\t'
+	csvReader.FieldsPerRecord = 1
+
+	csvData, err := csvReader.ReadAll()
+	if err != nil {
+		if *debugFlag {
+			log.Printf("SSHConfig.getSnapshotList : csvReader.ReadAll(%s) : %s", s.name, err)
+		}
+		return err
+	}
+
+	for _, rec := range csvData {
+		s.snapshot = append(s.snapshot, Snapshot(rec[0]))
+	}
+
+	if *debugFlag {
+		log.Printf("SSHConfig.getSnapshotList : %s : read %d zfs snapshots", s.name, len(s.snapshot))
+	}
+
+	session.Close()
+
+	return nil
+}
+
+func (s *SSHConfig) getZFSList() error {
+	if *debugFlag {
+		log.Printf("SSHConfig.getZFSList : Start %s", s.name)
+	}
+	if !s.logged {
+		return fmt.Errorf("Client %s not logged in.", s.name)
+	}
+
+	session, err := s.client.NewSession()
+	if err != nil {
+		if *debugFlag {
+			log.Printf("SSHConfig.getZFSList : client.NewSession(%s) : %s", s.name, err)
+		}
+		return err
+	}
+
+	var b bytes.Buffer
+	session.Stdout = &b
+	err = session.Run("/sbin/zfs list -H -o name,mountpoint")
+	if err != nil {
+		if *debugFlag {
+			log.Printf("SSHConfig.getZFSList : session.Run(%s) : %s", s.name, err)
+		}
+		return err
+	}
+
+	s.zfs = make(map[string]string)
+
+	csvReader := csv.NewReader(&b)
+	csvReader.Comma = '\t'
+	csvReader.FieldsPerRecord = 2
+
+	csvData, err := csvReader.ReadAll()
+	if err != nil {
+		if *debugFlag {
+			log.Printf("SSHConfig.getZFSList : csvReader.ReadAll(%s) : %s", s.name, err)
+		}
+		return err
+	}
+
+	for _, rec := range csvData {
+		s.zfs[rec[0]] = rec[1]
+	}
+
+	if *debugFlag {
+		log.Printf("SSHConfig.getZFSList : %s : read %d zfs file systems", s.name, len(s.zfs))
+	}
+
+	session.Close()
+
+	return nil
+
+}
+
+func (s *SSHConfig) isZFS(path string) bool {
+	if *debugFlag {
+		log.Printf("SSHConfig.isZFS : Start %s:%s", s.name, path)
+	}
+	if len(s.zfs) == 0 {
+		err := s.getZFSList()
+		if err != nil {
+			if *debugFlag {
+				log.Printf("SSHConfig.isZFS : s.getZFSList(%s) : %s", s.name, err)
+			}
+			return false
+		}
+	}
+	_, ok := s.zfs[path]
+	if ok {
+		return true
+	}
+	return false
+}
+
+func (s *SSHConfig) exec(cmd string) error {
+	if *debugFlag {
+		log.Printf("SSHConfig.exec : Start %s on %s", cmd, s.name)
+	}
+
+	session, err := s.client.NewSession()
+	if err != nil {
+		if *debugFlag {
+			log.Printf("SSHConfig.exec : client(%s).NewSession(%s) : %s", s.name, cmd, err)
+		}
+		return err
+	}
+
+	err = session.Run(cmd)
+	if err != nil {
+		if *debugFlag {
+			log.Printf("SSHConfig.exec : session(%s).Run(%s) : %s", s.name, cmd, err)
+		}
+		return err
+	}
+
+	session.Close()
+
+	return nil
+}
+
+func (s *SSHConfig) createZFS(path string) error {
+	if *debugFlag {
+		log.Printf("SSHConfig.createZFS : Start %s:%s", s.name, path)
+	}
+	if len(s.zfs) == 0 {
+		err := s.getZFSList()
+		if err != nil {
+			if *debugFlag {
+				log.Printf("SSHConfig.createZFS : s.getZFSList(%s) : %s", s.name, err)
+			}
+			return err
+		}
+	}
+	p := strings.Split(path, `/`)
+	var base string
+	for _, d := range p {
+		if base == "" {
+			base = d
+		} else {
+			base = base + `/` + d
+		}
+		if _, ok := s.zfs[base]; !ok {
+
+			if *debugFlag {
+				log.Printf("SSHConfig.createZFS : Creating %s:%s", s.name, base)
+			}
+
+			err := s.exec("/sbin/zfs create -o mountpoint=none " + base)
+			if err != nil {
+				if *debugFlag {
+					log.Printf("SSHConfig.createZFS : s.exec(%s) : %s", s.name, err)
+				}
+				return err
+			}
+
+			s.zfs[base] = "none"
+		}
+	}
+
+	return nil
+
+}
+
+func (a AppConfig) RunAppSchedule(schedule string) error {
+	if *debugFlag {
+		log.Printf("RunAppSchedule : Running %s(%s)", a.Name, schedule)
+	}
+	for _, src := range a.Sources {
+		if !cfg.ssh[src.Box()].isZFS(src.Path()) {
+			return fmt.Errorf("No path %s on source", string(src))
+		}
+		for _, dest := range a.Destinations {
+			if !cfg.ssh[dest.Box()].isZFS(dest.Path() + "/" + src.Box() + "/" + src.Path()) {
+				err := cfg.ssh[dest.Box()].createZFS(dest.Path() + "/" + src.Box() + "/" + src.Path())
+				if err != nil {
+					if *debugFlag {
+						log.Printf("RunAppSchedule : Error creating %s on %s", dest.Path()+"/"+src.Box()+"/"+src.Path(), dest.Box())
+					}
+					return err
+				}
+			}
+		}
+	}
+	for k, v := range a.Before {
+		re := regexp.MustCompile(k)
+		if re.MatchString(schedule) {
+			err := cfg.ssh[v.Box()].exec(v.Path())
+			if err != nil {
+				if *debugFlag {
+					log.Printf("RunAppSchedule : Error executing %s", string(v))
+				}
+				return err
+			}
+		}
+	}
+	var refreshSnapshot map[string]bool
+	refreshSnapshot = make(map[string]bool)
+	for _, v := range a.Sources {
+		if *debugFlag {
+			log.Printf("RunAppSchedule : taking %s snapshot for %s", schedule, v.Path())
+		}
+		err := cfg.ssh[v.Box()].exec("/usr/sbin/zfsnap snapshot -p '" + schedule + "-' -a " + cfg.Zfsnap[schedule] + " " + v.Path())
+		if err != nil {
+			if *debugFlag {
+				log.Printf("RunAppSchedule : Error executing zfsnap on %s", string(v))
+			}
+			return err
+		}
+		refreshSnapshot[v.Box()] = true
+	}
+	for k, _ := range refreshSnapshot {
+		if *debugFlag {
+			log.Printf("RunAppSchedule : refreshing snapshots for source %s", k)
+		}
+		err := cfg.ssh[k].getSnapshotList()
+		if err != nil {
+			if *debugFlag {
+				log.Printf("RunAppSchedule : Error getting snapshots on %s", k)
+			}
+			return err
+		}
+	}
+	for _, src := range a.Sources {
+		for _, dest := range a.Destinations {
+			if *debugFlag {
+				log.Printf("RunAppSchedule : Sending snapshots from %s to %s", string(src), string(dest))
+
+			}
+		}
+	}
+	for k, v := range a.After {
+		re := regexp.MustCompile(k)
+		if re.MatchString(schedule) {
+			err := cfg.ssh[v.Box()].exec(v.Path())
+			if err != nil {
+				if *debugFlag {
+					log.Printf("RunAppSchedule : Error executing %s on %s", v.Path(), v.Box())
+				}
+				return err
+			}
+		}
+	}
+	return nil
+}
+
+func main() {
+	flag.Parse()
+
+	err := cfg.Load()
+	if err != nil {
+		log.Printf("Cannot load config (%s)", err)
+		os.Exit(1)
+	}
+
+	schedule := *schedFlag
+	if schedule == "" {
+		log.Printf("Main : Finding out schedule.")
+		now := time.Now()
+		if now.Day() == 1 && int(now.Month()) == 1 {
+			schedule = "yearly"
+		} else if now.Day() == 1 {
+			schedule = "monthly"
+		} else if now.Weekday().String() == "Monday" {
+			schedule = "weekly"
+		} else {
+			schedule = "daily"
+		}
+	}
+
+	err = RunSchedule(schedule)
+	if err != nil {
+		log.Printf("Cannot run schedule (%s)", err)
+		os.Exit(1)
+	}
+}
+
+//RunSchedule run all backup targets where schedule is registered
+func RunSchedule(schedule string) error {
+	if *debugFlag {
+		log.Printf("RunSchedule : Start %s", schedule)
+	}
+	if _, ok := cfg.Zfsnap[schedule]; !ok {
+		return fmt.Errorf("No retention defined for %s schedule", schedule)
+	}
+
+	for _, app := range cfg.Apps {
+		for _, schedName := range app.Schedule {
+			if schedName == schedule {
+				err := app.RunAppSchedule(schedule)
+				if err != nil {
+					if *debugFlag {
+						log.Printf("RunSchedule : Error running %s(%s)", app.Name, schedule)
+					}
+					return err
+				}
+			}
+		}
+	}
+
+	return nil
+}
diff --git a/go.mod b/go.mod
new file mode 100644
index 0000000..2827e9a
--- /dev/null
+++ b/go.mod
@@ -0,0 +1,5 @@
+module gogs.siteop.biz/shoopea/backup
+
+go 1.16
+
+require golang.org/x/crypto v0.0.0-20210921155107-089bfa567519 // indirect
diff --git a/go.sum b/go.sum
new file mode 100644
index 0000000..a06bcfd
--- /dev/null
+++ b/go.sum
@@ -0,0 +1,9 @@
+golang.org/x/crypto v0.0.0-20210921155107-089bfa567519 h1:7I4JAnoQBe7ZtJcBaYHi5UtiO8tQHbUSXxL+pnGRANg=
+golang.org/x/crypto v0.0.0-20210921155107-089bfa567519/go.mod h1:GvvjBRRGRdwPK5ydBHafDWAxML/pGHZbMvKqRZ5+Abc=
+golang.org/x/net v0.0.0-20210226172049-e18ecbb05110/go.mod h1:m0MpNAwzfU5UDzcl9v0D8zg8gWTRqZa9RBIspLL5mdg=
+golang.org/x/sys v0.0.0-20201119102817-f84b799fce68/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20210615035016-665e8c7367d1 h1:SrN+KX8Art/Sf4HNj6Zcz06G7VEz+7w9tdXTPOZ7+l4=
+golang.org/x/sys v0.0.0-20210615035016-665e8c7367d1/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/term v0.0.0-20201126162022-7de9c90e9dd1/go.mod h1:bj7SfCRtBDWHUb9snDiAeCFNEtKQo2Wmx5Cou7ajbmo=
+golang.org/x/text v0.3.3/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
+golang.org/x/tools v0.0.0-20180917221912-90fa682c2a6e/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=