Tests: Accessory functions to create temporary files

These use tempfile.NamedTemporaryFile but allow execution without
raising "Text file busy".
The file is removed at exit (of the process) so no cleanup is necessary.

test/basetest/utils.py

@@ -5,6 +5,8 @@ import sys
 import socket
 import signal
 import functools
+import atexit
+import tempfile
 from subprocess import Popen, PIPE, STDOUT
 from threading import Thread
 from Queue import Queue, Empty
@@ -444,4 +446,32 @@ def parse_datafile(file):
     return data
 
 
+def mkstemp(data):
+    """
+    Create a temporary file that is removed at process exit
+    """
+    def rmtemp(name):
+        try:
+            os.remove(name)
+        except OSError:
+            pass
+
+    f = tempfile.NamedTemporaryFile(delete=False)
+    f.write(data)
+    f.close()
+
+    # Ensure removal at end of python session
+    atexit.register(rmtemp, f.name)
+
+    return f.name
+
+
+def mkstemp_exec(data):
+    """Create a temporary executable file that is removed at process exit
+    """
+    name = mkstemp(data)
+    os.chmod(name, 0755)
+
+    return name
+
 # vim: ai sts=4 et sw=4