Getting some parts to run as expected.

backive.yml

@@ -1,17 +1,18 @@
 devices:
   scanner-usbstick:
     uuid: 72A9-D8C5
-    mountname: scanner_usbstick
+    #mountname: scanner_usbstick
     owner: qwc
   server-backups:
     uuid: d220b335-ded9-48f5-bc03-800a3f953c34
-    mountname: server_backups
+    #mountname: server_backups
     owner: qwc
 backups:
   scanner_usbstick_test:
     user: qwc
-    target_device: scanner-usbstick
+    targetDevice: scanner-usbstick
     frequency: 0
+    scriptPath: ./testbackup.sh
     script: |
       #! /usr/bin/env bash
       #
@@ -23,9 +24,12 @@ backups:
       cp -Rv ${BACKIVE_FROM}/* ${BACKIVE_MOUNT}/${BACKIVE_TO}/
       ls -la ${BACKIVE_MOUNT}/${BACKIVE_TO}
       ls -la ${BACKIVE_MOUNT}
-    from: /home/qwc/web/worktime
+    sourcePath: /home/qwc/web/worktime
-    to: worktime
+    targetPath: worktime
-preferences:
+settings:
-  mount_root: /mnt/backups
+  systemMountPoint: /mnt/backups
+  unixSocketLocation: /tmp/backive/backive.sock
+  logLocation: /var/log/backive
+  dbLocation: /var/lib/backive
 
 

cmd/backive/main.go

@@ -1,6 +1,7 @@
 package main
 
 import (
+	"bytes"
 	"container/list"
 	"encoding/json"
 	"fmt"
@@ -8,6 +9,8 @@ import (
 	"log"
 	"net"
 	"os"
+	"os/exec"
+	"path"
 	"time"
 
 	"github.com/spf13/viper"
@@ -15,14 +18,20 @@ import (
 
 var logfile os.File
 
-func setupLogging() {
+func createDirectoryIfNotExists(dir string) {
-	logdir := "/var/log/backive"
+	if _, err := os.Stat(dir); err == nil {
-	logname := "/var/log/backive/backive.log"
-	if _, err := os.Stat(logdir); err == nil {
 		//ignore
 	} else if os.IsNotExist(err) {
-		os.MkdirAll(logdir, 0755)
+		os.MkdirAll(dir, 0755)
+	} else {
+		log.Fatal(err)
 	}
+}
+
+func setupLogging() {
+	logname := "/var/log/backive/backive.log"
+	logdir, _ := path.Split(logname)
+	createDirectoryIfNotExists(logdir)
 	logfile, err := os.OpenFile(logname, os.O_APPEND|os.O_CREATE|os.O_RDWR, 0666)
 	if err != nil {
 		fmt.Println("Error creating logfile!")
@@ -45,13 +54,15 @@ type Database struct {
 	path string "/var/lib/backive/data.json"
 }
 
-// SaveDb saves the database
+// Save saves the database
 func (d *Database) Save() {
 	jsonstr, merr := json.Marshal(d.data)
 	if merr != nil {
 		panic(merr)
 	}
-
+	log.Printf("Writing database output to file: %s", jsonstr)
+	saveDir, _ := path.Split(d.path)
+	createDirectoryIfNotExists(saveDir)
 	err := os.WriteFile(d.path, []byte(jsonstr), 0644)
 	if err != nil {
 		panic(err)
@@ -78,18 +89,45 @@ type Device struct {
 	UUID       string `mapstructure:"uuid"`
 	OwnerUser  string `mapstructure:"owner,omitempty"`
 	isMounted  bool
+	devsByUuid string "/dev/disk/by-uuid/"
 }
 
 // Mount will mount a device
-func (d *Device) Mount() {
+func (d *Device) Mount() error {
-
+	createDirectoryIfNotExists(config.Settings.SystemMountPoint)
+	cmd := exec.Command(
+		"mount",
+		path.Join(d.devsByUuid, d.UUID),
+		path.Join(config.Settings.SystemMountPoint, d.Name),
+	)
+	err := cmd.Run()
+	if err != nil {
+		log.Fatal(err)
+		return err
+	}
 	d.isMounted = true
+	return nil
 }
 
 // Unmount will unmount a device
-func (d *Device) Unmount() {
+func (d *Device) Unmount() error {
-
+	sync := exec.Command("sync")
+	syncErr := sync.Run()
+	if syncErr != nil {
+		log.Fatal(syncErr)
+		return syncErr
+	}
+	cmd := exec.Command(
+		"umount",
+		path.Join(config.Settings.SystemMountPoint, d.Name),
+	)
+	err := cmd.Run()
+	if err != nil {
+		log.Fatal(err)
+		return err
+	}
 	d.isMounted = false
+	return nil
 }
 
 func (d *Device) IsMounted() bool {
@@ -100,11 +138,12 @@ func (d *Device) IsMounted() bool {
 type Backup struct {
 	Name         string `mapstructure:",omitempty"`
 	TargetDevice string `mapstructure:"targetDevice"`
-	TargetDir    string `mapstructure:"targetDir"`
+	TargetPath   string `mapstructure:"targetPath"`
-	SourceDir    string `mapstructure:"sourceDir"`
+	SourcePath   string `mapstructure:"sourcePath"`
 	ScriptPath   string `mapstructure:"scriptPath"`
 	Frequency    int    `mapstructure:"frequency"`
 	ExeUser      string `mapstructure:"user,omitempty"`
+	logger       *log.Logger
 }
 
 // Configuration struct holding the settings and config items of devices and backups
@@ -120,6 +159,8 @@ type Settings struct {
 	SystemMountPoint   string `mapstructure:"systemMountPoint"`
 	UserMountPoint     string `mapstructure:"userMountPoint"`
 	UnixSocketLocation string `mapstructure:"unixSocketLocation"`
+	LogLocation        string `mapstructure:"logLocation"`
+	DbLocation         string `mapstructure:"dbLocation"`
 }
 
 // Devices is nothing else than a name to Device type mapping
@@ -128,6 +169,15 @@ type Devices map[string]Device
 // Backups is nothing else than a name to Backup type mapping
 type Backups map[string]Backup
 
+func (bs *Backups) findBackupForDevice(d Device) (*Backup, bool) {
+	for _, b := range *bs {
+		if d.Name == b.TargetDevice {
+			return &b, true
+		}
+	}
+	return nil, false
+}
+
 // CreateViper creates a viper instance for usage later
 func (c *Configuration) CreateViper() {
 	vconfig := viper.New()
@@ -175,7 +225,10 @@ type EventHandler struct {
 
 // Init initializes the unix socket.
 func (eh *EventHandler) Init(socketPath string) {
+	log.Println("Initializing EventHandler...")
 	var err error
+	dir, _ := path.Split(socketPath)
+	createDirectoryIfNotExists(dir)
 	eh.ls, err = net.Listen("unix", socketPath)
 	if err != nil {
 		panic(err)
@@ -185,11 +238,12 @@ func (eh *EventHandler) Init(socketPath string) {
 
 // Listen starts the event loop.
 func (eh *EventHandler) Listen() {
+	log.Println("Running eventloop")
+	func() {
 		for {
-		go func() {
 			eh.process()
-		}()
 		}
+	}()
 }
 
 // RegisterCallback adds a function to the list of callback functions for processing of events.
@@ -200,6 +254,7 @@ func (eh *EventHandler) RegisterCallback(cb func(map[string]string)) {
 // process processes each and every unix socket event, Unmarshals the json data and calls the list of callbacks.
 func (eh *EventHandler) process() {
 	client, err := eh.ls.Accept()
+	log.Println("Accepted client")
 	if err != nil {
 		log.Fatal(err)
 	}
@@ -215,46 +270,69 @@ func (eh *EventHandler) process() {
 			break
 		}
 	}
-	log.Println(data)
+	sdata := string(bytes.Trim(data, "\x00"))
+	log.Println(sdata)
 	env := map[string]string{}
-	errjson := json.Unmarshal(data, &env)
+	errjson := json.Unmarshal([]byte(sdata), &env)
 	if errjson != nil {
 		log.Fatal(errjson)
 	}
 	for _, v := range eh.callbacks {
+		if v != nil {
 			v(env)
 		}
+	}
+}
+
+func (b *Backup) CanRun() error {
+	// target path MUST exist
+	if b.TargetPath == "" {
+		return fmt.Errorf("The setting targetPath MUST exist within a backup configuration.")
+	}
+	//  script must exist, having only script means this is handled in the script
+	if b.ScriptPath == "" {
+		return fmt.Errorf("The setting scriptPath must exist within a backup configuration.")
+	}
+	return nil
+}
+
+func (b *Backup) PrepareRun() error {
+	createDirectoryIfNotExists(path.Join(
+		config.Settings.SystemMountPoint,
+		b.TargetDevice,
+		b.TargetPath,
+	))
+	// configure extra logger
+	logname := "/var/log/backive/backive.log"
+	logdir, _ := path.Split(logname)
+	createDirectoryIfNotExists(logdir)
+	logname = path.Join(logdir, b.Name)
+	logfile, err := os.OpenFile(logname, os.O_APPEND|os.O_CREATE|os.O_RDWR, 0666)
+	if err != nil {
+		log.Fatalln("Error creating logfile!")
+	}
+	writer := io.MultiWriter(logfile)
+	b.logger = log.New(writer, b.Name, log.LstdFlags)
+	return nil
 }
 
 // Run runs the backup script with appropriate rights.
 func (b *Backup) Run() error {
-	cfg := config
+	if dev, ok := config.Devices[b.Name]; ok && dev.IsMounted() {
-	if dev := cfg.Devices[b.Name]; dev.IsMounted() {
+		// setup script environment including user to use
-		checkExistence := func(path string, name string) error {
+		cmd := exec.Command("/usr/bin/sh", b.ScriptPath)
-			if _, err := os.Stat(path); err != nil {
+		b.logger.Printf("Running backup script of '%s'", b.Name)
-				if os.IsNotExist(err) {
+		// does this work?
-					return fmt.Errorf("%s does not exist", name)
+		cmd.Stdout = b.logger.Writer()
-				} else {
+		cmd.Stderr = b.logger.Writer()
-					return fmt.Errorf("Error when checking %s: %w", name, err)
+		// run script
-				}
+		err := cmd.Run()
+		if err != nil {
+			log.Fatalf("Backup '%s' run failed", b.Name)
+			return err
 		}
 		return nil
 	}
-		// Check for existence of target dir
-		if err := checkExistence(b.TargetDir, "target directory"); err != nil {
-			return err
-		}
-		// check for existence of source dir
-		if err := checkExistence(b.SourceDir, "source directory"); err != nil {
-			return err
-		}
-		// check for existence of script path
-		if err := checkExistence(b.ScriptPath, "script path"); err != nil {
-			return err
-		}
-		// setup script environment including user to use
-		// run script
-	}
 	// quit with error that the device is not available.
 	return fmt.Errorf("The device is not mounted")
 }
@@ -327,6 +405,48 @@ func (r *Runs) LastRun(b Backup) (time.Time, error) {
 	return time.Unix(0, 0), fmt.Errorf("Backup name not found and therefore has never run")
 }
 
+func defaultCallback(envMap map[string]string) {
+	if action, ok := envMap["ACTION"]; ok && action == "add" {
+		var dev Device
+		var uuid string
+		if fs_uuid, ok := envMap["ID_FS_UUID"]; !ok {
+			log.Fatalln("ID_FS_UUID not available ?!")
+		} else {
+			uuid = fs_uuid
+		}
+		log.Println("Device Added")
+		var uuidFound bool
+		// Check the devices if the UUID is in the config
+		for _, device := range config.Devices {
+			if uuid == device.UUID {
+				uuidFound = true
+				dev = device
+			}
+		}
+		if uuidFound {
+			dev.Mount()
+			backup, found := config.Backups.findBackupForDevice(dev)
+			if found {
+				err := backup.CanRun()
+				if err == nil {
+					prepErr := backup.PrepareRun()
+					if prepErr != nil {
+						log.Fatalf("Error running the backup routine: %v", err)
+					}
+					rerr := backup.Run()
+					if rerr != nil {
+						log.Fatalf("Error running the backup routine: %v", err)
+					}
+				} else {
+					log.Fatalf("Error running the backup routine: %v", err)
+				}
+			}
+			dev.Unmount()
+		}
+
+	}
+}
+
 func main() {
 	setupLogging()
 	// TODO: do proper signal handling!
@@ -337,10 +457,10 @@ func main() {
 	runs.Load(database)
 
 	// init scheduler and check for next needed runs?
-
 	// start event loop
 	events.Init(config.Settings.UnixSocketLocation)
-	// accept event
+	events.RegisterCallback(defaultCallback)
+	// accept events
 	events.Listen()
 
 	// cleanup if anything is there to cleanup