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cim_test.go
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cim_test.go
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//go:build windows
// +build windows
package cimfs
import (
"bytes"
"context"
"errors"
"fmt"
"io"
"os"
"path/filepath"
"testing"
"time"
"github.com/Microsoft/go-winio"
"github.com/Microsoft/go-winio/pkg/guid"
hcsschema "github.com/Microsoft/hcsshim/internal/hcs/schema2"
"golang.org/x/sys/windows"
)
// A simple tuple type used to hold information about a file/directory that is created
// during a test.
type tuple struct {
filepath string
fileContents []byte
isDir bool
}
// A utility function to create a file/directory and write data to it in the given cim.
func createCimFileUtil(c *CimFsWriter, fileTuple tuple) error {
// create files inside the cim
fileInfo := &winio.FileBasicInfo{
CreationTime: windows.NsecToFiletime(time.Now().UnixNano()),
LastAccessTime: windows.NsecToFiletime(time.Now().UnixNano()),
LastWriteTime: windows.NsecToFiletime(time.Now().UnixNano()),
ChangeTime: windows.NsecToFiletime(time.Now().UnixNano()),
FileAttributes: 0,
}
if fileTuple.isDir {
fileInfo.FileAttributes = windows.FILE_ATTRIBUTE_DIRECTORY
}
if err := c.AddFile(filepath.FromSlash(fileTuple.filepath), fileInfo, int64(len(fileTuple.fileContents)), []byte{}, []byte{}, []byte{}); err != nil {
return err
}
if !fileTuple.isDir {
wc, err := c.Write(fileTuple.fileContents)
if err != nil || wc != len(fileTuple.fileContents) {
if err == nil {
return fmt.Errorf("unable to finish writing to file %s", fileTuple.filepath)
} else {
return err
}
}
}
return nil
}
// This test creates a cim, writes some files to it and then reads those files back.
// The cim created by this test has only 3 files in the following tree
// /
// |- foobar.txt
// |- foo
// |--- bar.txt
func TestCimReadWrite(t *testing.T) {
if !IsCimFSSupported() {
t.Skipf("CimFs not supported")
}
testContents := []tuple{
{"foobar.txt", []byte("foobar test data"), false},
{"foo", []byte(""), true},
{"foo\\bar.txt", []byte("bar test data"), false},
}
tempDir := t.TempDir()
cimName := "test.cim"
cimPath := filepath.Join(tempDir, cimName)
c, err := Create(tempDir, "", cimName)
if err != nil {
t.Fatalf("failed while creating a cim: %s", err)
}
defer func() {
// destroy cim sometimes fails if tried immediately after accessing & unmounting the cim so
// give some time and then remove.
time.Sleep(3 * time.Second)
if err := DestroyCim(context.Background(), cimPath); err != nil {
t.Fatalf("destroy cim failed: %s", err)
}
}()
for _, ft := range testContents {
err := createCimFileUtil(c, ft)
if err != nil {
t.Fatalf("failed to create the file %s inside the cim:%s", ft.filepath, err)
}
}
if err := c.Close(); err != nil {
t.Fatalf("cim close: %s", err)
}
// mount and read the contents of the cim
volumeGUID, err := guid.NewV4()
if err != nil {
t.Fatalf("generate cim mount GUID: %s", err)
}
mountvol, err := Mount(cimPath, volumeGUID, hcsschema.CimMountFlagCacheFiles)
if err != nil {
t.Fatalf("mount cim : %s", err)
}
defer func() {
if err := Unmount(mountvol); err != nil {
t.Fatalf("unmount failed: %s", err)
}
}()
for _, ft := range testContents {
if ft.isDir {
_, err := os.Stat(filepath.Join(mountvol, ft.filepath))
if err != nil {
t.Fatalf("stat directory %s from cim: %s", ft.filepath, err)
}
} else {
f, err := os.Open(filepath.Join(mountvol, ft.filepath))
if err != nil {
t.Fatalf("open file %s: %s", filepath.Join(mountvol, ft.filepath), err)
}
defer f.Close()
fileContents := make([]byte, len(ft.fileContents))
// it is a file - read contents
rc, err := f.Read(fileContents)
if err != nil && !errors.Is(err, io.EOF) {
t.Fatalf("failure while reading file %s from cim: %s", ft.filepath, err)
} else if rc != len(ft.fileContents) {
t.Fatalf("couldn't read complete file contents for file: %s, read %d bytes, expected: %d", ft.filepath, rc, len(ft.fileContents))
} else if !bytes.Equal(fileContents[:rc], ft.fileContents) {
t.Fatalf("contents of file %s don't match", ft.filepath)
}
}
}
}