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car_test.go
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car_test.go
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package main
import (
"bufio"
"encoding/binary"
"fmt"
"io"
"io/fs"
"os"
"testing"
)
var testDir string
type testEntry struct {
name string
mode uint32
size uint64
link string
content byte
}
var headerSize = uint64(449)
var rightHeader = []*testEntry{
{mode: 020000000755, size: 0, name: "dir1"},
{mode: 0644, size: 0, name: "dir1/empty"},
{mode: 0755, size: 16, name: "dir1/exe", content: 'x'},
{mode: 0600, size: 4300, name: "dir1/private", content: 'p'},
{mode: 0444, size: 8300, name: "dir1/readonly", content: 'r'},
{mode: 020000000755, size: 0, name: "dir2"},
{mode: 0644, size: 200, name: "dir2/200", content: '2'},
{mode: 0644, size: 4096, name: "dir2/4k", content: '4'},
{mode: 0644, size: 4192, name: "dir2/4k1", content: '1'},
{mode: 0644, size: 8300, name: "dir2/copy_of_readonly"},
{mode: 020000000755, size: 0, name: "dir2/subdir"},
{mode: 01000000777, size: 0, name: "dir2/subdir/link", link: "../4k"},
{mode: 0644, size: 512, name: "toplevel", content: 't'},
}
func fillFile(path string, mode int, c byte, size uint64) error {
f, err := os.OpenFile(path, os.O_CREATE|os.O_WRONLY, os.FileMode(mode))
if err != nil {
return err
}
defer f.Close()
f2 := bufio.NewWriter(f)
defer f2.Flush()
for i := uint64(0); i < size; i++ {
if err := f2.WriteByte(c); err != nil {
return err
}
}
return nil
}
func makeEntry(e *testEntry) error {
if fs.FileMode(e.mode)&fs.ModeDir != 0 {
if err := os.Mkdir(testDir+"/"+e.name, os.FileMode(e.mode)); err != nil {
return err
}
} else if fs.FileMode(e.mode)&fs.ModeSymlink != 0 {
if err := os.Symlink(e.link, testDir+"/"+e.name); err != nil {
return err
}
} else {
if err := fillFile(testDir+"/"+e.name, int(e.mode), e.content, e.size); err != nil {
return err
}
}
return nil
}
func copyFile(src, dst string) error {
srcFd, err := os.Open(src)
if err != nil {
return err
}
defer srcFd.Close()
dstFd, err := os.Create(dst)
if err != nil {
return err
}
_, err = io.Copy(dstFd, srcFd)
return err
}
func testSetup(t *testing.T) (car, error) {
var err error
var car = car{
dupMap: map[uint64]*fixedData{},
verbose: new(bool),
}
testDir = t.TempDir()
for _, e := range rightHeader {
if err = makeEntry(e); err != nil {
return car, err
}
}
err = copyFile(testDir+"/dir1/readonly", testDir+"/dir2/copy_of_readonly")
return car, err
}
func TestGenHeader(t *testing.T) {
c, err := testSetup(t)
if err != nil {
t.Fatal(err)
}
err = c.genHeader([]string{
testDir + "/dir1",
testDir + "/dir2/",
testDir + "//toplevel"},
)
if err != nil {
t.Fatal("genHeader failed")
}
if c.header.Size != headerSize {
t.Error("Header size mismatch, expected", headerSize, "got", c.header.Size)
}
if len(c.header.entries) != len(rightHeader) {
t.Error("Header entry count mismatch, expected", len(rightHeader), ", got", len(c.header.entries))
}
for i, v := range c.header.entries {
if v.name != rightHeader[i].name {
t.Error("Entry name mismatch, expected", rightHeader[i].name, "got", v.name)
}
if v.Size != rightHeader[i].size {
t.Error("Entry size mismatch, expected", rightHeader[i].size, "got", v.Size)
}
if v.Mode != rightHeader[i].mode {
t.Errorf("Entry mode mismatch, expected %o got %o", rightHeader[i].mode, v.Mode)
}
}
}
func parseHeader(path string) error {
fileInfo, err := os.Stat(path)
if err != nil {
return err
}
if fileInfo.Size() != int64(0x1000) {
return fmt.Errorf("Header size mismatch, expected 4kb got %d", fileInfo.Size())
}
headerFd, err := os.Open(path)
if err != nil {
return err
}
defer headerFd.Close()
headerReader := bufio.NewReader(headerFd)
buf := make([]byte, 0x1000)
if _, err = headerReader.Read(buf[:4]); err != nil {
return err
}
if magic := string(buf[:4]); magic != cowMagic {
return fmt.Errorf("Header magic mismatch, expected '%s' got '%s'", cowMagic, magic)
}
var offset uint64
for i := 0; ; i++ {
var entry entry
if err = binary.Read(headerReader, binary.BigEndian, &entry.fixedData); err != nil {
return err
}
if entry.Mode == EOR {
break
}
if i >= len(rightHeader) {
return fmt.Errorf("Header entry count mismatch, expected %d got %d", len(rightHeader), i)
}
_, err = headerReader.Read(buf[:entry.NameLength])
if err != nil {
return err
}
name := string(buf[:entry.NameLength])
e := rightHeader[i]
if entry.Mode != e.mode {
return fmt.Errorf("Entry mode mismatch, expected %o got %o", e.mode, entry.Mode)
}
if name != e.name {
return fmt.Errorf("Entry name mismatch, expected %s got %s", e.name, name)
}
if entry.Size != e.size {
return fmt.Errorf("Entry size mismatch, expected %d got %d", e.size, entry.Size)
}
/* File dir1/readonly is identical to dir2/copy_of_readonly,
* check that the data offset is the same
*/
if name == "dir1/readonly" {
offset = entry.Offset
} else if name == "dir2/copy_of_readonly" {
if entry.Offset != offset {
return fmt.Errorf("Entry offset mismatch, expected %d got %d", offset, entry.Offset)
}
}
if fs.FileMode(entry.Mode)&fs.ModeSymlink != 0 {
err = binary.Read(headerReader, binary.BigEndian, &entry.linkLen)
if err != nil {
return err
}
_, err = headerReader.Read(buf[:entry.linkLen])
if err != nil {
return err
}
if link := string(buf[:entry.linkLen]); link != e.link {
return fmt.Errorf("Entry link mismatch, expected %s got %s", e.link, link)
}
}
}
n, err := headerReader.Read(buf)
if err != nil {
return err
}
for _, v := range buf[:n] {
if v != 0 {
return fmt.Errorf("Garbage data found in header padding: %x", v)
}
}
return nil
}
func TestWriteHeader(t *testing.T) {
c, err := testSetup(t)
if err != nil {
t.Fatal(err)
}
err = c.genHeader([]string{
testDir + "/dir1",
testDir + "/dir2",
testDir + "/toplevel"},
)
if err != nil {
t.Fatal("genHeader failed")
}
outDir := t.TempDir()
outDir = "."
outFd, err := os.Create(outDir + "/test.car")
if err != nil {
t.Fatal(err)
}
defer outFd.Close()
if err = c.writeHeader(outFd); err != nil {
t.Fatal(err)
}
outFd.Close()
if err = parseHeader(outDir + "/test.car"); err != nil {
t.Fatal(err)
}
}