Trac #33213: clean up after tmp_filename() and tmp_dir() for now.

Until these two functions are eliminated from the library, we don't
want them cluttering up /tmp. In typical usage, this is easy enough to
avoid by using one parent temporary directory to contain all the other
temporary files and directories, and then removing that one parent as
sage exits.

Author: orlitzky

src/sage/misc/temporary_file.py

@@ -28,6 +28,13 @@
 import tempfile
 import atexit
 
+# Until tmp_dir() and tmp_filename() are removed, we use this directory
+# as the parent for all temporary files & directories created by them.
+# This lets us clean up after those two functions when sage exits normally
+# using an atexit hook
+TMP_DIR_FILENAME_BASE=tempfile.TemporaryDirectory()
+atexit.register(lambda: TMP_DIR_FILENAME_BASE.cleanup())
+
 
 def delete_tmpfiles():
     """
@@ -96,7 +103,9 @@ def tmp_dir(name="dir_", ext=""):
         0
         sage: f.close()
     """
-    tmp = tempfile.mkdtemp(prefix=name, suffix=ext)
+    tmp = tempfile.mkdtemp(prefix=name,
+                           suffix=ext,
+                           dir=TMP_DIR_FILENAME_BASE.name)
     name = os.path.abspath(tmp)
     return name + os.sep
 
@@ -145,7 +154,9 @@ def tmp_filename(name="tmp_", ext=""):
         0
         sage: f.close()
     """
-    handle, tmp = tempfile.mkstemp(prefix=name, suffix=ext)
+    handle, tmp = tempfile.mkstemp(prefix=name,
+                                   suffix=ext,
+                                   dir=TMP_DIR_FILENAME_BASE.name)
     os.close(handle)
     name = os.path.abspath(tmp)
     return name