How to Retrieve a File\'s GID from an os.Stat() Result in Go?

Retrieving a File's GID in Go

Question:

Given an os.Stat() result on Linux, how can we programmatically retrieve the file's group ID (GID)?

Context:

The os.Stat() function provides file metadata, including information about the file's group ownership. However, the resulting FileInfo object's Sys() method returns an Interface{} without direct access to the GID.

Solution:

To extract the GID from the Interface{}, we can leverage the reflect module and typecast the result to a *syscall.Stat_t structure, a type exposed by the Linux-specific syscall package. The following code demonstrates this:

<code class="go">import (
    "fmt"
    "os"
    "syscall"
)

func main() {
    abspath := "/path/to/file"
    file_info, _ := os.Stat(abspath)
    file_sys := file_info.Sys()
    file_gid := fmt.Sprint(file_sys.(*syscall.Stat_t).Gid)
    fmt.Println("File GID:", file_gid)
}</code>

This method provides a reliable way to retrieve the file's GID on Linux systems.

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