Added a little helper script to remove unused tags from the perforce import.

Signed-off-by: Simon Hausmann <shausman@trolltech.com>

contrib/fast-import/p4-clean-tags.py

@@ -0,0 +1,40 @@
+#!/usr/bin/python
+#
+# p4-debug.py
+#
+# Author: Simon Hausmann <hausmann@kde.org>
+# License: MIT <http://www.opensource.org/licenses/mit-license.php>
+#
+# removes unused p4 import tags
+#
+import os, string, sys
+import popen2, getopt
+
+branch = "refs/heads/master"
+
+try:
+    opts, args = getopt.getopt(sys.argv[1:], "", [ "branch=" ])
+except getopt.GetoptError:
+    print "fixme, syntax error"
+    sys.exit(1)
+
+for o, a in opts:
+    if o == "--branch":
+        branch = "refs/heads/" + a
+
+sout, sin, serr = popen2.popen3("git-name-rev --tags `git-rev-parse %s`" % branch)
+output = sout.read()
+tagIdx = output.index(" tags/p4/")
+caretIdx = output.index("^")
+rev = int(output[tagIdx + 9 : caretIdx])
+
+allTags = os.popen("git tag -l p4/").readlines()
+for i in range(len(allTags)):
+    allTags[i] = int(allTags[i][3:-1])
+
+allTags.sort()
+
+allTags.remove(rev)
+
+for rev in allTags:
+    print os.popen("git tag -d p4/%s" % rev).read()