diff mercurial/merge.py @ 20415:e4d7cbc94219 stable

merge: don't overwrite file untracked after remove, abort with 'untracked files'

Merge could overwrite untracked files and cause data loss.

Instead we now handle the 'local side removed file and has untracked file
instead' case as the 'other side added file that local has untracked' case:

  FILE: untracked file exists
  abort: untracked files in working directory differ from files in requested revision

It could perhaps make sense to create .orig files when overwriting, either
instead of aborting or when overwriting anyway because of force ... but for now
we stay consistent with similar cases.

--- a/mercurial/merge.py	Wed Feb 05 17:23:35 2014 -0600
+++ b/mercurial/merge.py	Mon Feb 10 00:43:54 2014 +0100
@@ -343,7 +343,12 @@
                 else:
                     actions.append((f, "g", (fl2,), "remote created"))
         elif n2 and n2 != ma[f]:
-            prompts.append((f, "dc")) # prompt deleted/changed
+            different = _checkunknownfile(repo, wctx, p2, f)
+            if not force and different:
+                aborts.append((f, "ud"))
+            else:
+                # if different: old untracked f may be overwritten and lost
+                prompts.append((f, "dc")) # prompt deleted/changed
 
     for f, m in sorted(aborts):
         if m == "ud":