From 19c6a4f8369f37c0df1fb57008a891eb6a6dc4bb Mon Sep 17 00:00:00 2001
From: Junio C Hamano <gitster@pobox.com>
Date: Thu, 21 Jan 2010 16:38:56 -0800
Subject: merge-recursive: do not return NULL only to cause segfault

merge-recursive calls write_tree_from_memory() to come up with a virtual
tree, with possible conflict markers inside the blob contents, while
merging multiple common ancestors down.  It is a bug to call the function
with unmerged entries in the index, even if the merge to come up with the
common ancestor resulted in conflicts.  Otherwise the result won't be
expressible as a tree object.

We _might_ want to suggest the user to set GIT_MERGE_VERBOSITY to 5 and
re-run the merge in the message.  At least we will know which part of
process_renames() or process_entry() functions is not correctly handling
the unmerged paths, and it might help us diagnosing the issue.

Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/merge-recursive.c b/merge-recursive.c
index dd4fbd0..22a31ed 100644
--- a/merge-recursive.c
+++ b/merge-recursive.c
@@ -200,14 +200,14 @@ struct tree *write_tree_from_memory(struct merge_options *o)
 
 	if (unmerged_cache()) {
 		int i;
-		output(o, 0, "There are unmerged index entries:");
+		fprintf(stderr, "BUG: There are unmerged index entries:\n");
 		for (i = 0; i < active_nr; i++) {
 			struct cache_entry *ce = active_cache[i];
 			if (ce_stage(ce))
-				output(o, 0, "%d %.*s", ce_stage(ce),
-				       (int)ce_namelen(ce), ce->name);
+				fprintf(stderr, "BUG: %d %.*s", ce_stage(ce),
+					(int)ce_namelen(ce), ce->name);
 		}
-		return NULL;
+		die("Bug in merge-recursive.c");
 	}
 
 	if (!active_cache_tree)
-- 
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