python: Add wrapper of mdb_copy that we can call from python

This is like the use of tdbbackup for tdb files.

Signed-off-by: Gary Lockyer <gary@catalyst.net.nz>
Reviewed-by: Andrew Bartlett <abartlet@samba.org>

python/samba/mdb_util.py

@@ -0,0 +1,40 @@
+# Unix SMB/CIFS implementation.
+# mdb util helpers
+#
+# Copyright (C) Andrew Bartlett <abartlet@samba.org> 2018
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+import samba
+import subprocess
+import os
+
+
+def mdb_copy(file1, file2):
+    """Copy mdb file using mdb_copy utility and rename it
+    """
+    # Find the location of the mdb_copy tool
+    dirs = os.getenv('PATH').split(os.pathsep)
+    for d in dirs:
+        toolpath = os.path.join(d, "mdb_copy")
+        if os.path.exists(toolpath):
+            break
+
+    mdb_copy_cmd = [toolpath, "-n", file1, "%s.copy.mdb" % file1]
+    status = subprocess.call(mdb_copy_cmd, close_fds=True, shell=False)
+
+    if status == 0:
+        os.rename("%s.copy.mdb" % file1, file2)
+    else:
+        raise Exception("Error copying %d  %s" % (status, file1))