tests: add Flistxattr/Fgetxattr/Fremovexattr tests

Test for the upcoming fd-based xattr support.

tests/xattr/xattr_fd_test.go

@@ -0,0 +1,61 @@
+//+build linux
+
+// Darwin does not support Fgetxattr and friends!
+
+package xattr_tests
+
+import (
+	"io/ioutil"
+	"syscall"
+	"testing"
+
+	"golang.org/x/sys/unix"
+
+	"github.com/rfjakob/gocryptfs/tests/test_helpers"
+)
+
+func TestFdXattr(t *testing.T) {
+	attr := "user.foo"
+	fn := test_helpers.DefaultPlainDir + "/TestFdXattr"
+	err := ioutil.WriteFile(fn, nil, 0700)
+	if err != nil {
+		t.Fatalf("creating empty file failed: %v", err)
+	}
+	fd, err := syscall.Open(fn, syscall.O_RDONLY, 0)
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer syscall.Close(fd)
+	buf := make([]byte, 1000)
+	sz, err := unix.Flistxattr(fd, buf)
+	if sz != 0 {
+		t.Errorf("expected zero size, got %d", sz)
+	}
+	val1 := []byte("123456789")
+	unix.Fsetxattr(fd, attr, val1, 0)
+	sz, err = unix.Flistxattr(fd, buf)
+	// Length of "user.attr" + terminating null byte
+	expectedSz := len(attr) + 1
+	if sz != expectedSz {
+		t.Errorf("expected size %d, got %d", expectedSz, sz)
+	}
+	str := string(buf[:sz-1])
+	if str != attr {
+		t.Errorf("expected name %q, got %q", attr, str)
+	}
+	// Check content
+	sz, err = unix.Fgetxattr(fd, attr, buf)
+	str = string(buf[:sz])
+	if str != string(val1) {
+		t.Errorf("expected val %q, got %q", val1, str)
+	}
+	// Delete value
+	err = unix.Fremovexattr(fd, attr)
+	if err != nil {
+		t.Error(err)
+	}
+	sz, err = unix.Flistxattr(fd, buf)
+	if sz != 0 {
+		t.Errorf("expected zero size, got %d", sz)
+	}
+}

tests/xattr/xattr_integration_test.go

@@ -1,4 +1,10 @@
-package defaults
+package xattr_tests
+
+// xattr integration tests.
+//
+// These tests are not integrated into the "matrix" tests because of the need
+// to switch TMPDIR to /var/tmp.
+// TODO: check if it actually causes trouble in the "matrix" tests.
 
 import (
 	"bytes"