tests: give "-plaintextnames" its own test package

...and add tests for checking that gocryptfs.diriv
does not get created.

The main "integration_tests" package has become quite
big and convoluted over time.

This small separate package should make writing tests
for "-plaintextnames" easier.

As seen in "fusefrontend: fix PlaintextNames versions of Mkdir, Rmdir",
we need more of them.

tests/integration_tests/cli_test.go

@@ -9,7 +9,6 @@ import (
 	"testing"
 
 	"github.com/rfjakob/gocryptfs/internal/configfile"
-	"github.com/rfjakob/gocryptfs/internal/nametransform"
 
 	"github.com/rfjakob/gocryptfs/tests/test_helpers"
 )
@@ -79,30 +78,6 @@ func TestInitConfig(t *testing.T) {
 	}
 }
 
-// Test -init -plaintextnames
-func TestInitPlaintextNames(t *testing.T) {
-	dir := test_helpers.InitFS(t, "-plaintextnames")
-	dir = dir + "/"
-	_, err := os.Stat(dir + configfile.ConfDefaultName)
-	if err != nil {
-		t.Fatal(err)
-	}
-	_, err = os.Stat(dir + nametransform.DirIVFilename)
-	if err == nil {
-		t.Errorf("gocryptfs.diriv should not have been created with -plaintextnames")
-	}
-	_, cf, err := configfile.LoadConfFile(dir+configfile.ConfDefaultName, "test")
-	if err != nil {
-		t.Fatal(err)
-	}
-	if !cf.IsFeatureFlagSet(configfile.FlagPlaintextNames) {
-		t.Error("PlaintextNames flag should be set but isnt")
-	}
-	if cf.IsFeatureFlagSet(configfile.FlagEMENames) || cf.IsFeatureFlagSet(configfile.FlagDirIV) {
-		t.Error("FlagEMENames and FlagDirIV should be not set")
-	}
-}
-
 // Test -ro
 func TestRo(t *testing.T) {
 	dir := test_helpers.InitFS(t)

tests/plaintextnames/plaintextnames_test.go

@@ -0,0 +1,82 @@
+package plaintextnames
+
+// integration tests that target plaintextnames specifically
+
+import (
+	"io/ioutil"
+	"os"
+	"testing"
+
+	"github.com/rfjakob/gocryptfs/internal/configfile"
+
+	"github.com/rfjakob/gocryptfs/tests/test_helpers"
+)
+
+var cDir string
+var pDir string
+
+// Create and mount "-plaintextnames" fs
+func TestMain(m *testing.M) {
+	cDir = test_helpers.InitFS(nil, "-plaintextnames")
+	pDir = cDir + ".mnt"
+	test_helpers.MountOrExit(cDir, pDir, "-extpass", "echo test")
+	os.Exit(m.Run())
+}
+
+// Only the PlaintextNames feature flag should be set
+func TestFlags(t *testing.T) {
+	_, cf, err := configfile.LoadConfFile(cDir+"/gocryptfs.conf", "test")
+	if err != nil {
+		t.Fatal(err)
+	}
+	if !cf.IsFeatureFlagSet(configfile.FlagPlaintextNames) {
+		t.Error("PlaintextNames flag should be set but isnt")
+	}
+	if cf.IsFeatureFlagSet(configfile.FlagEMENames) || cf.IsFeatureFlagSet(configfile.FlagDirIV) {
+		t.Error("FlagEMENames and FlagDirIV should be not set")
+	}
+}
+
+// gocryptfs.diriv should NOT be created
+func TestDirIV(t *testing.T) {
+	_, err := os.Stat(cDir + "/gocryptfs.diriv")
+	if err == nil {
+		t.Errorf("gocryptfs.diriv should not be created in the top directory")
+	}
+	err = os.Mkdir(pDir+"/dir1", 0777)
+	if err != nil {
+		t.Error(err)
+	}
+	_, err = os.Stat(pDir + "/dir1/gocryptfs.diriv")
+	if err == nil {
+		t.Errorf("gocryptfs.diriv should not be created in a subdirectory")
+	}
+}
+
+// With "-plaintextnames", the name "/gocryptfs.conf" is reserved, but everything
+// else should work.
+func TestFiltered(t *testing.T) {
+	filteredFile := pDir + "/gocryptfs.conf"
+	err := ioutil.WriteFile(filteredFile, []byte("foo"), 0777)
+	if err == nil {
+		t.Errorf("should have failed but didn't")
+	}
+	err = os.Remove(filteredFile)
+	if err == nil {
+		t.Errorf("should have failed but didn't")
+	}
+	err = ioutil.WriteFile(pDir+"/gocryptfs.diriv", []byte("foo"), 0777)
+	if err != nil {
+		t.Error(err)
+	}
+	subDir, err := ioutil.TempDir(pDir, "")
+	if err != nil {
+		t.Fatal(err)
+	}
+	fd, err := os.Create(subDir + "/gocryptfs.conf")
+	if err != nil {
+		t.Error(err)
+	} else {
+		fd.Close()
+	}
+}

tests/test_helpers/helpers.go

@@ -66,7 +66,8 @@ func ResetTmpDir(plaintextNames bool) {
 
 // InitFS calls "gocryptfs -init" on a new directory in TmpDir, passing
 // "extraArgs" in addition to practical defaults.
-// The returned "dir" has NO trailing slash.
+//
+// The returned cipherdir has NO trailing slash.
 func InitFS(t *testing.T, extraArgs ...string) string {
 	dir, err := ioutil.TempDir(TmpDir, "")
 	if err != nil {