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.
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...
UPDATE:
Per nemo's answer and invitation, I have provided a cross-platform Go package that does this.
To display information of all file system statistics in GB (Gigabyte) use the option as 'df -h'.
Here, we will learn to get the disk usage information in Golang. In the Go programming language, to get disk usage information – we use the Statfs() function of the syscall package. The Statfs() function is used to get the filesystem statistics.
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))
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)
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.
Minio has a package (GoDoc) to show disk usage that is cross platform, and seems to be well maintained:
import (
"github.com/minio/minio/pkg/disk"
humanize "github.com/dustin/go-humanize"
)
func printUsage(path string) error {
di, err := disk.GetInfo(path)
if err != nil {
return err
}
percentage := (float64(di.Total-di.Free)/float64(di.Total))*100
fmt.Printf("%s of %s disk space used (%0.2f%%)\n",
humanize.Bytes(di.Total-di.Free),
humanize.Bytes(di.Total),
percentage,
)
}
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