How to check file and directory permissions using syscall in Golang?

To check file and directory permissions using the syscall package in Go, you can use the Stat function to retrieve the file or directory information, and then use the Mode method on the returned FileInfo object to obtain the permission mode.

Here's an example:

package main

import (
	"fmt"
	"os"
	"syscall"
)

func main() {
	filename := "path/to/file_or_directory"
	info, err := os.Stat(filename)
	if err != nil {
		fmt.Println("Error:", err)
		return
	}

	mode := info.Mode()
	perm := mode.Perm()

	fmt.Printf("Permissions for %s: %04o\n", filename, perm)
}

Make sure to replace "path/to/file_or_directory" with the actual path to the file or directory you want to check.

The os.Stat function returns a FileInfo object that contains various information about the file or directory. The Mode method on this object returns a os.FileMode value representing the permission mode. The Perm method on os.FileMode returns the permission value as an octal number.

In the example above, %04o is used to format the permission value as a 4-digit octal number (e.g., 0644 for a file with read and write permissions for the owner and read-only permissions for others).

Note that the permission value of a directory might not reflect its effective permissions due to additional restrictions imposed by the operating system or other factors.