How to Retrieve the File Group ID (GID) in Go?

Retrieving File Group ID (GID) in Go

Getting the group ID (GID) of a file is essential when managing file permissions in Go applications. While the os.Stat() function provides a FileInfo object with a Sys() method, accessing the GID programmatically can be a challenge.

To overcome this, you can utilize the reflect module to delve into the underlying data structure returned by Sys(). By utilizing reflection, it's possible to determine that the return type of Sys() is *syscall.Stat_t. This knowledge allows us to access the Gid field directly, as demonstrated below:

<code class="go">file_info, _ := os.Stat(abspath)
file_sys := file_info.Sys()
file_gid := fmt.Sprint(file_sys.(*syscall.Stat_t).Gid)</code>

This approach effectively extracts the GID as a string. However, if you prefer a more type-safe solution, you can cast the GID to an integer using int(file_sys.(*syscall.Stat_t).Gid).

It's worth noting that this solution relies on the syscall package and may not be portable across all operating systems. For a more cross-platform approach, consider using a third-party library that provides platform-specific file operations.

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