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disk.go
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disk.go
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package main
import (
"fmt"
"os"
"path/filepath"
"strings"
"github.com/gotoz/runq/internal/util"
"github.com/gotoz/runq/pkg/vm"
"golang.org/x/sys/unix"
)
func setupDisks(disks []vm.Disk) error {
for _, disk := range disks {
dev, err := findDisk(disk.Serial)
if err != nil {
return err
}
if dev == "" {
return fmt.Errorf("disk %q not found", disk.Dir)
}
if err := createDiskSymlink(dev, disk.ID); err != nil {
return err
}
if !disk.Mount {
continue
}
if err := loadKernelModules(disk.Fstype, "/rootfs"); err != nil {
return err
}
mnt := vm.Mount{
ID: disk.ID,
Source: "/dev/" + dev,
Target: "/rootfs" + disk.Dir,
Fstype: disk.Fstype,
Flags: unix.MS_NOSUID | unix.MS_NODEV,
}
if err := mount(mnt); err != nil {
return err
}
}
return nil
}
func setupRootdisk(vmdata *vm.Data) error {
var disk vm.Disk
for i, d := range vmdata.Disks {
if d.ID == vmdata.Rootdisk {
disk = d
// remove rootdisk from disks
vmdata.Disks = append(vmdata.Disks[:i], vmdata.Disks[i+1:]...)
break
}
}
dev, err := findDisk(disk.Serial)
if err != nil {
return err
}
if dev == "" {
return fmt.Errorf("rootdisk device not found")
}
if err := createDiskSymlink(dev, disk.ID); err != nil {
return err
}
mnt := vm.Mount{
ID: disk.ID,
Source: "/dev/" + dev,
Target: "/rootfs",
Fstype: disk.Fstype,
Flags: 0,
}
if err := mount(mnt); err != nil {
return err
}
return nil
}
// findDisk searches for a block device in sysfs for a given serial number.
func findDisk(serial string) (string, error) {
files, err := os.ReadDir("/sys/block")
if err != nil {
return "", fmt.Errorf("os.ReadDir failed: %w", err)
}
for _, f := range files {
fi, _ := f.Info()
if fi.Mode()&os.ModeSymlink == 0 {
continue
}
if !strings.HasPrefix(f.Name(), "vd") {
continue
}
path := filepath.Join("/sys/block", f.Name(), "serial")
buf, err := os.ReadFile(path)
if err != nil {
return "", fmt.Errorf("os.ReadFile failed: %w", err)
}
if serial == strings.TrimSpace(string(buf)) {
return f.Name(), nil
}
}
return "", nil
}
func createDiskSymlink(dev, name string) error {
wd, err := os.Getwd()
if err != nil {
return fmt.Errorf("os.Getwd failed: %w", err)
}
defer os.Chdir(wd)
const dir = "/dev/disk/by-runq-id"
if !util.DirExists(dir) {
if err := os.MkdirAll(dir, 0755); err != nil {
return err
}
}
if err := os.Chdir(dir); err != nil {
return fmt.Errorf("os.Chdir(%s) failed: %w", dir, err)
}
if err := os.Symlink("../../"+dev, name); err != nil {
return fmt.Errorf("can't create symlink: %v", err)
}
return nil
}