91 lines
1.9 KiB
Go
91 lines
1.9 KiB
Go
package main
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import (
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"errors"
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"flag"
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"fmt"
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"io/ioutil"
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"os"
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"os/exec"
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"path/filepath"
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"time"
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)
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func main() {
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path := flag.String("path", "", "Path to the folder to archive")
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backupFolder := flag.String("backup", "./archive", "Path to the backup folder")
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count := flag.Int("count", 3, "Number of backup to keep in the archive")
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flag.Parse()
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if len(*path) == 0 {
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fmt.Println("missing --path argument")
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os.Exit(2)
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}
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if *count < 1 {
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fmt.Println("--count must be greater than 0")
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os.Exit(3)
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}
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if _, err := os.Stat(*path); err != nil {
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err = os.MkdirAll(*path, 0750)
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if err != nil {
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fmt.Println(err)
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os.Exit(4)
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}
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}
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absSourcePath, err := filepath.Abs(*path)
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if err != nil {
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fmt.Println(err)
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os.Exit(5)
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}
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absDstPath, err := filepath.Abs(*backupFolder)
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if err != nil {
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fmt.Println(err)
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os.Exit(5)
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}
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if err := makeBackup(absSourcePath, absDstPath, *count); err != nil {
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fmt.Println(err)
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os.Exit(7)
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}
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}
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// makeBackup make a backup
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func makeBackup(source, dst string, count int) error {
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err := cleanOldBackup(dst, count-1)
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if err != nil {
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return err
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}
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name := time.Now().Format("2006_01_02__15_04_05")
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output, err := exec.Command("cp", "-r", source, filepath.Join(dst, name)).CombinedOutput()
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if err != nil {
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return errors.New(string(output))
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}
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return nil
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}
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// cleanOldBackup clean up old archives so as not to exceed the quota
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func cleanOldBackup(backupFolder string, count int) error {
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files, err := ioutil.ReadDir(backupFolder)
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if err != nil {
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return err
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}
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for len(files) > count {
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oldestTime := time.Now()
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var oldestFile os.FileInfo
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for _, file := range files {
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if file.ModTime().Before(oldestTime) {
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oldestFile = file
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oldestTime = file.ModTime()
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}
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}
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err = os.RemoveAll(filepath.Join(backupFolder, oldestFile.Name()))
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if err != nil {
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return err
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}
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files, err = ioutil.ReadDir(backupFolder)
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if err != nil {
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return err
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}
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}
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return nil
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}
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