使用 Go 获取可用磁盘空间量

问题描述：

基本上我想要 df -h 的输出，其中包括可用空间和卷的总大小.该解决方案需要在 Windows、Linux 和 Mac 上运行，并使用 Go 编写.

Basically I want the output of df -h, which includes both the free space and the total size of the volume. The solution needs to work on Windows, Linux, and Mac and be written in Go.

我浏览了 os 和 syscall Go 文档，但没有找到任何东西.在 Windows 上，即使是命令行实用程序也很笨拙(dir C:)或需要提升权限(fsutil volume diskfree C:).当然有一种方法可以做到这一点，我还没有找到......

I have looked through the os and syscall Go documentation and haven't found anything. On Windows, even command line utils are either awkward (dir C:) or need elevated privileges (fsutil volume diskfree C:). Surely there is a way to do this that I haven't found yet...

更新:
根据 nemo 的回答和邀请，我提供了一个跨平台 Go 包来执行此操作.

答

在 POSIX 系统上，您可以使用 sys.unix.Statfs.
以字节为单位打印当前工作目录的可用空间示例:

On POSIX systems you can use sys.unix.Statfs.
Example of printing free space in bytes of current working directory:

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))

对于 Windows，您还需要使用系统调用路由.示例(源，更新以匹配新的 sys/windows 包):

For Windows you need to go the syscall route as well. Example (source, updated to match new sys/windows package):

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

h := windows.MustLoadDLL("kernel32.dll")
c := h.MustFindProc("GetDiskFreeSpaceExW")

var freeBytes int64

_, _, err := c.Call(uintptr(unsafe.Pointer(windows.StringToUTF16Ptr(wd))),
    uintptr(unsafe.Pointer(&freeBytes)), nil, nil)

随意编写一个提供跨平台功能的包.关于如何实现跨平台的东西，请参阅构建工具帮助页面.

Feel free to write a package that provides the functionality cross-platform. On how to implement something cross-platform, see the build tool help page.

使用 Go 获取可用磁盘空间量

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