feat: cleanup old backups

cleanup.go

@@ -0,0 +1,35 @@
+package main
+
+import (
+	"io/ioutil"
+	"log"
+	"os"
+	"sort"
+)
+
+func cleanupOldBackups() error {
+	files, err := ioutil.ReadDir(config.Folder)
+	if err != nil {
+		return err
+	}
+
+	if len(files) < config.MaxBackups {
+		return nil
+	}
+
+	sort.Slice(files, func(i, j int) bool {
+		return files[i].ModTime().Unix() < files[j].ModTime().Unix()
+	})
+
+	oldest := files[:len(files)-config.MaxBackups]
+
+	for _, file := range oldest {
+		log.Printf("Removing old backup folder %s...\n", file.Name())
+		err = os.RemoveAll(config.Folder + file.Name())
+		if err != nil {
+			return err
+		}
+	}
+
+	return nil
+}

config.go

@@ -16,7 +16,7 @@ type conf struct {
 	Folder                string // Backup folder _with_ trailing slash
 	fullCurrentBackupPath string
 	Interval              time.Duration
-	MaxBackups            int64
+	MaxBackups            int
 }
 
 var (
@@ -34,7 +34,7 @@ func init() {
 	config = &conf{
 		Folder:     "/backups/",
 		Interval:   time.Hour * 6,
-		MaxBackups: 24,
+		MaxBackups: 10,
 	}
 
 	folder, has := os.LookupEnv(envBackupFolder)
@@ -58,10 +58,11 @@ func init() {
 
 	max, has := os.LookupEnv(envMax)
 	if has {
-		config.MaxBackups, err = strconv.ParseInt(max, 10, 64)
+		maxBackups, err := strconv.ParseInt(max, 10, 32)
 		if err != nil {
 			log.Fatalf("Invalid max: %s\n", err)
 		}
+		config.MaxBackups = int(maxBackups)
 	}
 
 	updateFullBackupPath()

main.go

@@ -19,12 +19,15 @@ func main() {
 
 	storeContainers(c, containers)
 
+	err = cleanupOldBackups()
+	if err != nil {
+		log.Fatalf("Could not clean old backups: %s", err)
+	}
+
 	err = dumpAllDatabases(c)
 	if err != nil {
-		// TODO: Only log errors while dumping dbs
 		log.Fatalf("Could not dump databases: %s", err)
 	}
 
 	// TODO: Cron
-	// TODO: Cleanup old
 }