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package defaults
import (
"os"
"sync"
"sync/atomic"
"syscall"
"testing"
"time"
"github.com/rfjakob/gocryptfs/v2/tests/test_helpers"
)
func TestDirIVRace(t *testing.T) {
// Create "dir1" with one file in it
dir1 := test_helpers.DefaultPlainDir + "/TestDirIVRace_Dir1"
err := os.Mkdir(dir1, 0700)
if err != nil {
t.Fatal(err)
}
err = os.WriteFile(dir1+"/file", nil, 0600)
if err != nil {
t.Fatal(err)
}
// Create directory "dir2"
dir2 := test_helpers.DefaultPlainDir + "/TestDirIVRace_Dir2"
err = os.Mkdir(dir2, 0700)
if err != nil {
t.Fatal(err)
}
file2 := dir2 + "/file"
err = os.WriteFile(file2, nil, 0600)
if err != nil {
t.Fatal(err)
}
var stop int32
defer func() { atomic.StoreInt32(&stop, 1) }()
var wg sync.WaitGroup
wg.Add(1)
go func() {
wg.Done()
for {
// Keep dir2 in the diriv cache
fd, err2 := os.Open(file2)
if err2 == nil {
fd.Close()
}
if atomic.LoadInt32(&stop) != 0 {
return
}
}
}()
wg.Wait()
time.Sleep(time.Millisecond)
// Overwrite dir2 with dir1
err = syscall.Unlink(file2)
if err != nil {
t.Fatal(err)
}
err = syscall.Rename(dir1, dir2)
if err != nil {
t.Fatal(err)
}
// We should be able to stat file2
_, err = os.Stat(file2)
if err != nil {
t.Error(err)
}
}
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