/
disk_windows.go
138 lines (113 loc) · 3.53 KB
/
disk_windows.go
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// Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
// SPDX-License-Identifier: Apache-2.0
//go:build windows
package disk
import (
"archive/zip"
"bytes"
_ "embed"
"errors"
"fmt"
"io"
"io/fs"
"os"
"path/filepath"
"github.com/runfinch/finch/pkg/winutil"
)
// EnsureUserDataDisk checks the current disk configuration and fixes it if needed.
func (m *userDataDiskManager) EnsureUserDataDisk() error {
diskPath := m.finch.UserDataDiskPath(m.rootDir)
disksDir := filepath.Dir(diskPath)
m.logger.Debugf("diskPath: %s", diskPath)
m.logger.Debugf("disksDir: %s", disksDir)
if _, err := m.fs.Stat(disksDir); errors.Is(err, fs.ErrNotExist) {
if err := m.fs.MkdirAll(disksDir, 0o700); err != nil {
return fmt.Errorf("could not create persistent disk directory: %w", err)
}
} else if err != nil {
return fmt.Errorf("error stating disksDir %q: %w", disksDir, err)
}
if _, err := m.fs.Stat(diskPath); errors.Is(err, fs.ErrNotExist) {
if err := m.createDisk(diskPath); err != nil {
return fmt.Errorf("could not create persistent disk: %w", err)
}
} else if err != nil {
return fmt.Errorf("error stating disksDir %q: %w", diskPath, err)
}
if err := m.attachDisk(diskPath); err != nil {
return fmt.Errorf("could not attach persistent disk: %w", err)
}
return nil
}
// DetachUserDataDisk unmounts the disk in wsl.
func (m *userDataDiskManager) DetachUserDataDisk() error {
cmd := m.ecc.Create(
"wsl.exe",
"--unmount",
`\\?\`+m.finch.UserDataDiskPath(m.rootDir),
)
m.logger.Debugf("running detach cmd: %v", cmd)
out, err := cmd.CombinedOutput()
if err != nil {
return fmt.Errorf("failed to detach disk: %w, command output: %s", err, out)
}
return nil
}
// min_win_disk.zip is a zip directory with a single file (disk.vhdx).
// disk.vhdx is a 50G max size, sparse, GPT, vhdx file created by diskpart, which contains
// a single ext4 partition. Since using diskpart requires Administrator privileges,
// we ship a pre-created disk to be used for the persistent data volume.
//
//go:embed min_win_disk.zip
var minWinDisk []byte
func (m *userDataDiskManager) createDisk(diskPath string) error {
m.logger.Infof("creating persistent disk: %s", diskPath)
r, err := zip.NewReader(bytes.NewReader(minWinDisk), int64(len(minWinDisk)))
if err != nil {
return fmt.Errorf("failed to create zip reader: %w", err)
}
for _, f := range r.File {
if f.Name == "disk.vhdx" {
compressed, err := f.Open()
if err != nil {
return fmt.Errorf("failed to open file inside zip: %w", err)
}
dest, err := os.OpenFile(filepath.Clean(diskPath), os.O_WRONLY|os.O_CREATE|os.O_TRUNC, f.Mode())
if err != nil {
return fmt.Errorf("failed to open persistent disk file: %w", err)
}
// avoid go-sec G110 by chunking
for {
_, err := io.CopyN(dest, compressed, 204800)
if err != nil {
if errors.Is(err, io.EOF) {
break
}
return fmt.Errorf("failed copy compressed file to disk: %w", err)
}
}
if err := dest.Close(); err != nil {
return fmt.Errorf("failed close disk file: %w", err)
}
break
}
}
return nil
}
func (m *userDataDiskManager) attachDisk(diskPath string) error {
m.logger.Infof("attaching disk at path: %s", diskPath)
cmd := m.ecc.Create(
"wsl.exe",
"--mount",
"--bare",
"--vhd",
diskPath,
)
m.logger.Debugf("running attach cmd: %v", cmd)
out, err := cmd.CombinedOutput()
outDecoded, _ := winutil.FromUTF16leToString(bytes.NewBuffer(out))
if err != nil {
return fmt.Errorf("failed to attach disk: %w, command output: %s", err, outDecoded)
}
return nil
}