How Can I Get Free Disk Space in Go Across Different Operating Systems?

Retrieving Free Disk Space in Go Across Multiple Platforms

In this article, we explore a solution to dynamically retrieve the free and total size of a storage volume using Go, regardless of the operating system (Windows, Linux, Mac). This solution eliminates the need for external commands like df -h or manual calculations.

For POSIX-based systems, we leverage the sys.unix.Statfs function to access the Statfs_t structure. For instance, to obtain the free space for the current working directory in bytes:

import "golang.org/x/sys/unix"
import "os"

var stat unix.Statfs_t

wd, err := os.Getwd()

unix.Statfs(wd, &stat)

// Available blocks * size per block = available space in bytes
fmt.Println(stat.Bavail * uint64(stat.Bsize))

In the case of Windows, we take the syscall approach. Here's an updated example using the newer sys/windows package:

import "golang.org/x/sys/windows"

var freeBytesAvailable uint64
var totalNumberOfBytes uint64
var totalNumberOfFreeBytes uint64

err := windows.GetDiskFreeSpaceEx(windows.StringToUTF16Ptr("C:"),
    &freeBytesAvailable, &totalNumberOfBytes, &totalNumberOfFreeBytes)

Don't hesitate to extend these examples into a cross-platform package for broader usage. For guidance on cross-platform implementation, consult the build tool's help documentation.

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