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|
package device
import (
"bufio"
"fmt"
"io"
"os"
"strings"
"golang.org/x/sys/unix"
)
// LinuxDevicesInfoGetter returns info for Linux devices
type LinuxDevicesInfoGetter struct {
MountsPath string
}
// Getter is current instance of DevicesInfoGetter
var Getter DevicesInfoGetter = LinuxDevicesInfoGetter{MountsPath: "/proc/mounts"}
// GetMounts returns all mounted filesystems from /proc/mounts
func (t LinuxDevicesInfoGetter) GetMounts() (Devices, error) {
file, err := os.Open(t.MountsPath)
if err != nil {
return nil, err
}
devices, err := readMountsFile(file)
if err != nil {
if cerr := file.Close(); cerr != nil {
return nil, fmt.Errorf("%w; %s", err, cerr)
}
return nil, err
}
if err := file.Close(); err != nil {
return nil, err
}
return devices, nil
}
// GetDevicesInfo returns result of GetMounts with usage info about mounted devices (by calling Statfs syscall)
func (t LinuxDevicesInfoGetter) GetDevicesInfo() (Devices, error) {
mounts, err := t.GetMounts()
if err != nil {
return nil, err
}
return processMounts(mounts, false)
}
func readMountsFile(file io.Reader) (Devices, error) {
mounts := Devices{}
scanner := bufio.NewScanner(file)
for scanner.Scan() {
line := scanner.Text()
parts := strings.Fields(line)
device := &Device{
Name: parts[0],
MountPoint: unescapeString(parts[1]),
Fstype: parts[2],
}
mounts = append(mounts, device)
}
if err := scanner.Err(); err != nil {
return nil, err
}
return mounts, nil
}
func processMounts(mounts Devices, ignoreErrors bool) (Devices, error) {
devices := Devices{}
for _, mount := range mounts {
if strings.Contains(mount.MountPoint, "/snap/") {
continue
}
if strings.HasPrefix(mount.Name, "/dev") ||
mount.Fstype == "zfs" ||
mount.Fstype == "nfs" ||
mount.Fstype == "nfs4" {
info := &unix.Statfs_t{}
err := unix.Statfs(mount.MountPoint, info)
if err != nil && !ignoreErrors {
return nil, err
}
mount.Size = int64(info.Bsize) * int64(info.Blocks)
mount.Free = int64(info.Bsize) * int64(info.Bavail)
devices = append(devices, mount)
}
}
return devices, nil
}
func unescapeString(str string) string {
return strings.ReplaceAll(str, "\\040", " ")
}
|
