First version of the Firefox profile backup script

It currently saves the data to a local .tar.bz2 archive, with a little
bit of filtering, but without uploading it anywhere.

.gitignore

@@ -1,2 +1,3 @@
 .*.swp
 *.pyc
+*.tar.bz2

ffx-backup.py

@@ -0,0 +1,54 @@
+#!/usr/bin/env python
+# -*- coding: utf-8 -*-
+
+# Regular expressions matching files and folders to exclude from the backup
+EXCLUDES = [
+    "/Cache",
+    "/OfflineCache/",
+    "\.mfasl$",
+    "/urlclassifier",
+    "/lock$",
+    "/parent.lock$",
+    "/.parentlock$",
+]
+
+import time, os, os.path, re, sys, tarfile
+
+if len(sys.argv) != 2:
+    print "Usage: %s path_to_profile" % sys.argv[0]
+    sys.exit(1)
+
+profile_path = sys.argv[1]
+profile_name = os.path.basename(profile_path)
+date = time.strftime("%Y%m%d_%H%M%S")
+archive_name = "%s-%s.tar.bz2" % (profile_name, date)
+
+# Compile exclusion regexps
+EXCLUDES_RE = []
+for regexp in EXCLUDES:
+    r = re.compile(regexp)
+    EXCLUDES_RE.append(r)
+
+# Uncompressed size
+total_size = 0
+
+# Exclusion decision function
+def is_excluded(filename):
+    global EXCLUDES_RE, total_size
+    for regexp in EXCLUDES_RE:
+        if regexp.search(filename):
+            return True
+    total_size += os.path.getsize(filename)
+    return False
+
+# Open the destination tar archive
+tar = tarfile.open(archive_name, 'w:bz2')
+
+# Add the data to the archive
+tar.add(profile_path, profile_name, exclude=is_excluded)
+
+tar.close()
+
+# Display archive name and sizes
+print "Profile saved to %s" % archive_name
+print "%.1f MB --> %.1f MB" % (total_size/(1024**2), os.path.getsize(archive_name)/(1024**2))