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-rw-r--r--tests/defaults/main_test.go49
1 files changed, 49 insertions, 0 deletions
diff --git a/tests/defaults/main_test.go b/tests/defaults/main_test.go
index 95835a4..1ad5f55 100644
--- a/tests/defaults/main_test.go
+++ b/tests/defaults/main_test.go
@@ -2,6 +2,7 @@
package defaults
import (
+ "bytes"
"os"
"os/exec"
"syscall"
@@ -57,3 +58,51 @@ func TestCtlSock(t *testing.T) {
t.Errorf("incorrect error handling: %+v", response)
}
}
+
+// In gocryptfs before v1.2, the file header was only read once for each
+// open. But truncating a file to zero will generate a new random file ID.
+// The sequence below caused an I/O error to be returned.
+func TestOpenTruncateRead(t *testing.T) {
+ fn := test_helpers.DefaultPlainDir + "/TestTruncateWrite"
+ // First FD is used for write and trucate.
+ writeFd, err := os.Create(fn)
+ if err != nil {
+ t.Fatal(err)
+ }
+ abc := []byte("abc")
+ _, err = writeFd.WriteAt(abc, 0)
+ if err != nil {
+ t.Fatal(err)
+ }
+ // Second FD is just for reading.
+ readFd, err := os.Open(fn)
+ if err != nil {
+ t.Fatal(err)
+ }
+ content := make([]byte, 3)
+ _, err = readFd.ReadAt(content, 0)
+ if err != nil {
+ t.Fatal(err)
+ }
+ if !bytes.Equal(content, abc) {
+ t.Fatalf("wrong content: %s", string(content))
+ }
+ // Truncate to zero to generate a new file ID and write new content.
+ err = writeFd.Truncate(0)
+ if err != nil {
+ t.Fatal(err)
+ }
+ xyz := []byte("xyz")
+ _, err = writeFd.WriteAt(xyz, 0)
+ if err != nil {
+ t.Fatal(err)
+ }
+ // Try to read from the other FD.
+ _, err = readFd.ReadAt(content, 0)
+ if err != nil {
+ t.Fatal(err)
+ }
+ if !bytes.Equal(content, xyz) {
+ t.Fatalf("wrong content: %s", string(content))
+ }
+}