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package main
import (
"os"
"gopkg.in/yaml.v2"
"io/ioutil"
"regexp"
"errors"
)
type Config struct {
Scripts []Scripts
}
type Scripts struct {
Name string
Recurrence string
Commands []string
}
func main() {
var config Config
err := yaml.Unmarshal(readFile(os.Args[1]), &config)
check(err)
timeFolders := []string{"15min", "hourly", "daily", "weekly", "monthly"}
//Check whether recurrence entries are valid
for i := 0; i < len(config.Scripts); i++ {
match, err := regexp.MatchString("15min|hourly|daily|weekly|monthly", config.Scripts[i].Recurrence)
check(err)
if !match {
panic(errors.New("Invalid recurrence."))
}
}
//Remove old scripts
for j := 0; j < len(config.Scripts); j++ {
for i := 0; i < len(timeFolders); i++ {
path := "/etc/periodic/" + timeFolders[i] + "/" + config.Scripts[j].Name
exists, err := existsFile(path)
check(err)
if exists {
os.Remove(path)
}
}
}
for i := 0; i < len(config.Scripts); i++ {
fileContent := "#!/bin/sh\n"
for j := 0; j < len(config.Scripts[i].Commands); j++ {
fileContent += config.Scripts[i].Commands[j] + "\n"
}
path := "/etc/periodic/" + config.Scripts[i].Recurrence + "/" + config.Scripts[i].Name
file, err := os.Create(path)
check(err)
file.WriteString(fileContent)
file.Sync()
os.Chmod(file.Name(), 0755)
}
}
func existsFile(path string) (bool, error) {
_, err := os.Stat(path)
if err == nil {
return true, nil
}
if os.IsNotExist(err) {
return false, nil
}
return true, err
}
func readFile(path string) []byte {
data, err := ioutil.ReadFile(path)
check(err)
return data
}
func check(e error) {
if e != nil {
panic(e)
}
}