From fd6415b692a6dd40c71c01b8ece716515a902921 Mon Sep 17 00:00:00 2001
From: Martin Gracik <mgracik@redhat.com>
Date: Tue, 16 Nov 2010 09:12:38 +0100
Subject: [PATCH] Add a script for diffing installtrees

---
 utils/filediff.py | 76 +++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 76 insertions(+)
 create mode 100644 utils/filediff.py

diff --git a/utils/filediff.py b/utils/filediff.py
new file mode 100644
index 00000000..5f4ae532
--- /dev/null
+++ b/utils/filediff.py
@@ -0,0 +1,76 @@
+import sys
+import os
+import magic
+import difflib
+
+
+def main(args):
+    try:
+        sourcedir, targetdir = args[1], args[2]
+    except IndexError:
+        print("invalid argument count")
+        print("usage: python {0} sourcetree targettree > output.diff".format(
+              args[0]))
+
+        sys.exit(2)
+
+    if sourcedir.endswith("/"):
+        sourcedir = sourcedir[:-1]
+    if targetdir.endswith("/"):
+        targetdir = targetdir[:-1]
+
+    sourcetree = {}
+    for root, dnames, fnames in os.walk(sourcedir):
+        for fname in fnames:
+            fpath = os.path.join(root, fname)
+            rpath = fpath.replace(sourcedir, "", 1)
+            sourcetree[rpath] = fpath
+
+    m = magic.open(magic.MAGIC_NONE)
+    m.load()
+
+    for root, dnames, fnames in os.walk(targetdir):
+        for fname in fnames:
+            fpath = os.path.join(root, fname)
+            rpath = fpath.replace(targetdir, "", 1)
+
+            sys.stderr.write('processing "%s"\n' % rpath)
+
+            targetfile = fpath
+            try:
+                sourcefile = sourcetree[rpath]
+            except KeyError:
+                sys.stdout.write('Missing: %s\n' % rpath)
+                continue
+
+            # skip broken links
+            if os.path.islink(targetfile) and not os.path.exists(targetfile):
+                continue
+
+            # check stat
+            #sourcemode = os.stat(sourcefile).st_mode
+            #targetmode = os.stat(targetfile).st_mode
+            #if sourcemode != targetmode:
+            #    sys.stdout.write('Stat differ: %s\n' % rpath)
+
+            ftype = m.file(fpath)
+
+            # diff only text files
+            if ftype not in ["ASCII text"]:
+                continue
+
+            with open(targetfile, "r") as fobj:
+                target = fobj.readlines()
+            with open(sourcefile) as fobj:
+                source = fobj.readlines()
+
+            # do a file diff
+            for line in difflib.unified_diff(source, target,
+                                             fromfile=sourcefile,
+                                             tofile=targetfile):
+
+                sys.stdout.write(line)
+
+
+if __name__ == "__main__":
+    main(sys.argv)