# HG changeset patch
# User Olle Lundberg <geek@nerd.sh>
# Date 1395790694 -3600
# Node ID 3b7dfa9bb7896e2fedc8a9626686e234e480e2e7
# Parent  e911d1da89df4d2ea6b1f1c0bee94666b8a40fd0
evolve: abort when trying to move a node on top of itself

This provides a clearer error message when evolve misstakenly tries
to move a changeset on top of itself. Before we got an abort with a
cryptic message about trying to rebase a merge changeset.

A proper fix to make sure that evolve never tries to move a node on
top of itself will come in later patches.

diff --git a/hgext/evolve.py b/hgext/evolve.py
--- a/hgext/evolve.py
+++ b/hgext/evolve.py
@@ -738,6 +738,12 @@
 def relocate(repo, orig, dest):
     """rewrite <rev> on dest"""
     try:
+        if orig.rev() == dest.rev():
+            raise util.Abort(_('tried to relocade a node on top of itself'),
+                             hint=_("This shouldn't happen. If you still "
+                                    "need to move changesets, please do so "
+                                    "manually with nothing to rebase - working directory parent is also destination"))
+
         rebase = extensions.find('rebase')
         # dummy state to trick rebase node
         if not orig.p2().rev() == node.nullrev: