pmtest: add memory check to tests with valgrind

Signed-off-by: Andrew Gregory <andrew.gregory.8@gmail.com>
Signed-off-by: Allan McRae <allan@archlinux.org>

test/pacman/README

@@ -62,6 +62,11 @@ This example will run all tests from the "tests" directory.
 Use the "help" option to get the full list of parameters:
 	./pactest.py --help
 
+When run with the `--valgrind' option, an additional rule will be added to all
+tests to check for memory leaks.  To use `--valgrind' when running the full
+test suite, run:
+    make PY_LOG_FLAGS=--valgrind check
+
 The following pieces of software are required to run the pactest suite:
 
 fakeroot (required to run as non-root user)

test/pacman/pmtest.py

@@ -224,6 +224,7 @@ def run(self, pacman):
                 "--child-silent-after-fork=yes",
                 "--log-file=%s" % os.path.join(self.root, "var/log/valgrind"),
                 "--suppressions=%s" % suppfile])
+            self.addrule("FILE_EMPTY=var/log/valgrind")
         cmd.extend([pacman["bin"],
             "--config", os.path.join(self.root, util.PACCONF),
             "--root", self.root,