Golang : Check if directory exist and create if does not exist


Tags : golang directory-folder os-isnotexist create-directory-folder

Anyway, need to modify an existing Golang program for a friend. The original developer left her company and basically, she needs the program to check if a directory/folder exist or not. If it is not there, create the folder and also need to report if and why the directory creation failed.

Below is a function that should check if a directory exists and create one if it does not exist.

Here you go!


 package main

 import (
 "fmt"
 "os"
 )

 func createDirectory(dirName string) bool {
 src, err := os.Stat(dirName)

 if os.IsNotExist(err) {
 errDir := os.MkdirAll(dirName, 0755)
 if errDir != nil {
 panic(err)
 }
 return true
 }

 if src.Mode().IsRegular() {
 fmt.Println(dirName, "already exist as a file!")
 return false
 }

 return false
 }

 func main() {
 if len(os.Args) != 2 {
 fmt.Printf("Usage : %s <directory>\n", os.Args[0])
 os.Exit(0)
 }

 directory := os.Args[1]

 result := createDirectory(directory)
 fmt.Println(directory, "created : ", result)
 }

Sample output:

$ ./createdirifnotexist

Usage : ./createdirifnotexist

$ ./createdirifnotexist webserver

webserver already exist as a file!

webserver created : false

$ ./createdirifnotexist webserver2

webserver2 created : true

$ ./createdirifnotexist webserver2

webserver2 created : false

$ rm -rf webserver2

$ ./createdirifnotexist webserver2

webserver2 created : true

Happy coding!

References:

https://golang.org/pkg/os/#IsNotExist

https://www.socketloop.com/tutorials/golang-check-if-a-directory-exist-in-go

  See also : Golang : Determine if directory is empty with os.File.Readdir() function



Tags : golang directory-folder os-isnotexist create-directory-folder

By Adam Ng

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