nfs admin: create directories used by nfs tests

Recent changes to ceph check that a directory exists in cephfs before it
will allow an NFS export of the dir to be created. It was a pretty shaky
practice of ours to create NFS exports without dirs backing them anyhow.
This change ensures the dirs exist before the test cases are run and
clean them up afterwards.

Signed-off-by: John Mulligan <jmulligan@redhat.com>

common/admin/nfs/export_test.go

@@ -13,12 +13,16 @@ import (
 	"github.com/stretchr/testify/assert"
 	tsuite "github.com/stretchr/testify/suite"
 
+	"github.com/ceph/go-ceph/cephfs"
 	"github.com/ceph/go-ceph/internal/admintest"
 	"github.com/ceph/go-ceph/internal/commands"
 	"github.com/ceph/go-ceph/rados"
 )
 
-var radosConnector = admintest.NewConnector()
+var (
+	radosConnector = admintest.NewConnector()
+	usableDirNames = []string{"january", "february", "march", "sept"}
+)
 
 func TestNFSAdmin(t *testing.T) {
 	tsuite.Run(t, new(NFSAdminSuite))
@@ -51,6 +55,11 @@ func (suite *NFSAdminSuite) SetupSuite() {
 	if suite.mockConfig {
 		suite.setupMockNFSConfig()
 	}
+	suite.setupDirs()
+}
+
+func (suite *NFSAdminSuite) TearDownSuite() {
+	suite.removeDirs()
 }
 
 func (suite *NFSAdminSuite) setupMockNFSConfig() {
@@ -74,6 +83,48 @@ func (suite *NFSAdminSuite) setupMockNFSConfig() {
 	require.NoError(err)
 }
 
+func (suite *NFSAdminSuite) setupDirs() {
+	require := suite.Require()
+	conn := radosConnector.GetConn(suite.T())
+	fs, err := cephfs.CreateFromRados(conn)
+	require.NoError(err)
+	defer func() {
+		require.NoError(fs.Release())
+	}()
+	err = fs.Mount()
+	require.NoError(err)
+	defer func() {
+		require.NoError(fs.Unmount())
+	}()
+
+	// establish a "random" list of dir names to work with
+	for _, name := range usableDirNames {
+		err = fs.MakeDir(name, 0777)
+		require.NoError(err, "failed to make dir "+name)
+	}
+}
+
+func (suite *NFSAdminSuite) removeDirs() {
+	require := suite.Require()
+	conn := radosConnector.GetConn(suite.T())
+	fs, err := cephfs.CreateFromRados(conn)
+	require.NoError(err)
+	defer func() {
+		require.NoError(fs.Release())
+	}()
+	err = fs.Mount()
+	require.NoError(err)
+	defer func() {
+		require.NoError(fs.Unmount())
+	}()
+
+	// establish a "random" list of dir names to work with
+	for _, name := range usableDirNames {
+		err = fs.RemoveDir(name)
+		require.NoError(err, "failed to remove dir "+name)
+	}
+}
+
 func (suite *NFSAdminSuite) TestCreateDeleteCephFSExport() {
 	require := suite.Require()
 	ra := radosConnector.Get(suite.T())