regtest: Convert the regtests to a python script and include it in the repo

I'm using it using a directory with all debuginfo packages in fedora, so
that I can run a before and after with different tools (pahole, pfunct),
and check the differences after some change.

Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

MANIFEST

@@ -48,3 +48,4 @@ ostra/python/ostra.py
 ctf.h
 libctf.c
 libctf.h
+regtest.py

regtest.py

@@ -0,0 +1,138 @@
+#! /usr/bin/python
+# -*- python -*-
+# -*- coding: utf-8 -*-
+#   tuna - Application Tuning GUI
+#   Copyright (C) 2009 Arnaldo Carvalho de Melo
+#   Arnaldo Carvalho de Melo <acme@redhat.com>
+#
+#   This application 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; version 2.
+#
+#   This application 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.
+
+import filecmp, os, sys
+
+regtest_output_dir = "/media/tb/pahole/regtest/"
+regtest_obj_dir = "/media/tb/debuginfo/usr/lib/debug/"
+tools = ("pahole -A",)
+len_debug_dir = len(regtest_obj_dir)
+len_regtest_output_dir_before = len(regtest_output_dir) + len("before/")
+verbose = 1
+
+def diff_file(tool_filename):
+	command = 'diff -u "%s" "%s" > /tmp/regtest.diff' % \
+		  (os.path.join(regtest_output_dir, "before", tool_filename),
+		   os.path.join(regtest_output_dir, "after", tool_filename))
+	if verbose > 0:
+		print command
+	os.system(command)
+	os.system("vim /tmp/regtest.diff")
+
+def dir_has_no_diffs(dirname):
+	return os.access(os.path.join(dirname, ".no_diffs"), os.F_OK)
+
+def set_dir_has_no_diffs(dirname):
+	f = file(os.path.join(dirname, ".no_diffs"), "w")
+	f.close()
+
+def reset_dir_has_no_diffs(dirname):
+	os.unlink(os.path.join(dirname, ".no_diffs"))
+
+def diff_dir(before, after, dir = None):
+	if dir:
+		before = os.path.join(before, dir)
+		after = os.path.join(after, dir)
+	print "\r%-120s" % before,
+	sys.stdout.flush()
+	diff = filecmp.dircmp(before, after)
+	if not dir_has_no_diffs(after):
+		diff_files = diff.diff_files
+		if diff_files:
+			print "\n  %s:\n	%s" % (before, diff_files)
+			sys.stdout.flush()
+			for f in diff_files:
+				diff_file(os.path.join(before[len_regtest_output_dir_before:], f))
+		else:
+			set_dir_has_no_diffs(after)
+	for dir in diff.common_dirs:
+		diff_dir(before, after, dir)
+
+def do_diffs():
+	before = os.path.join(regtest_output_dir, "before")
+	after = os.path.join(regtest_output_dir, "after")
+	diff_dir(before, after)
+
+def do_tool(tool, before_after, dirname, fname, prepend_obj_dir = False):
+	if prepend_obj_dir:
+		fname += ".debug"
+		fixed_dirname = dirname
+	else:
+		fixed_dirname = dirname[len_debug_dir:]
+	tool_output_dir = os.path.join(regtest_output_dir,
+				       before_after,
+				       fixed_dirname)
+	try:
+		os.makedirs(tool_output_dir)
+	except:
+		pass
+	if dir_has_no_diffs(tool_output_dir):
+		reset_dir_has_no_diffs(tool_output_dir)
+	obj_path = os.path.join(dirname, fname)
+	if prepend_obj_dir:
+		obj_path = os.path.join(regtest_obj_dir, obj_path)
+	command = '%s %s > "%s.%s.c"' % (tool, obj_path,
+				         os.path.join(tool_output_dir,
+						      fname[:-6]), tool)
+	if verbose > 1:
+		print command
+	elif verbose > 0:
+		print os.path.join(fixed_dirname, fname[:-6])
+	os.system(command)
+
+def do_tool_on_files(arg, dirname, fnames):
+	if dirname.find("/.") >= 0:
+		return
+	tool, before_after = arg
+	for fname in fnames:
+		if fname[-6:] != ".debug":
+			continue
+
+		do_tool(tool, before_after, dirname, fname)
+
+def do_tools(before_after):
+	for tool in tools:
+		os.path.walk(regtest_obj_dir, do_tool_on_files, (tool, before_after))
+
+def do_move():
+	print 'rm -f regtest_output_dir/before/*'
+	print 'mv -f regtest_output_dir/after/* regtest_output_dir/before/'
+
+def main(argv):
+	try:
+		if argv[1] in ('before', 'after'):
+			if len(argv) > 3:
+				dirname = argv[2]
+				for fname in argv[3:]:
+					for tool in tools:
+						do_tool(tool, argv[1], dirname, fname, True)
+			else:
+				do_tools(argv[1])
+		elif argv[1] == 'diff':
+			if len(argv) > 3:
+				dirname = argv[2]
+				for fname in argv[3:]:
+					for tool in tools:
+						diff_file("%s.%s.c" % (os.path.join(dirname, fname), tool))
+			else:
+				do_diffs()
+		elif argv[1] == 'move':
+			do_move()
+	except IOError:
+		pass
+
+if __name__ == '__main__':
+    main(sys.argv)