1 files changed, 55 insertions, 8 deletions

diff --git a/merge-recursive.c b/merge-recursive.c
index d415c4188..a91208f29 100644
--- a/merge-recursive.c
+++ b/merge-recursive.c
@@ -3,6 +3,7 @@
  * Fredrik Kuivinen.
  * The thieves were Alex Riesen and Johannes Schindelin, in June/July 2006
  */
+#include "advice.h"
 #include "cache.h"
 #include "cache-tree.h"
 #include "commit.h"
@@ -86,6 +87,7 @@ static void flush_output(struct merge_options *o)
 	}
 }
 
+__attribute__((format (printf, 3, 4)))
 static void output(struct merge_options *o, int v, const char *fmt, ...)
 {
 	int len;
@@ -170,6 +172,23 @@ static int git_merge_trees(int index_only,
 	int rc;
 	struct tree_desc t[3];
 	struct unpack_trees_options opts;
+	struct unpack_trees_error_msgs msgs = {
+		/* would_overwrite */
+		"Your local changes to '%s' would be overwritten by merge.  Aborting.",
+		/* not_uptodate_file */
+		"Your local changes to '%s' would be overwritten by merge.  Aborting.",
+		/* not_uptodate_dir */
+		"Updating '%s' would lose untracked files in it.  Aborting.",
+		/* would_lose_untracked */
+		"Untracked working tree file '%s' would be %s by merge.  Aborting",
+		/* bind_overlap -- will not happen here */
+		NULL,
+	};
+	if (advice_commit_before_merge) {
+		msgs.would_overwrite = msgs.not_uptodate_file =
+			"Your local changes to '%s' would be overwritten by merge.  Aborting.\n"
+			"Please, commit your changes or stash them before you can merge.";
+	}
 
 	memset(&opts, 0, sizeof(opts));
 	if (index_only)
@@ -181,6 +200,7 @@ static int git_merge_trees(int index_only,
 	opts.fn = threeway_merge;
 	opts.src_index = &the_index;
 	opts.dst_index = &the_index;
+	opts.msgs = msgs;
 
 	init_tree_desc_from_tree(t+0, common);
 	init_tree_desc_from_tree(t+1, head);
@@ -201,7 +221,8 @@ struct tree *write_tree_from_memory(struct merge_options *o)
 		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), ce_namelen(ce), ce->name);
+				output(o, 0, "%d %.*s", ce_stage(ce),
+				       (int)ce_namelen(ce), ce->name);
 		}
 		return NULL;
 	}
@@ -952,9 +973,31 @@ static int process_renames(struct merge_options *o,
 				       "%s added in %s",
 				       ren1_src, ren1_dst, branch1,
 				       ren1_dst, branch2);
-				new_path = unique_path(o, ren1_dst, branch2);
-				output(o, 1, "Adding as %s instead", new_path);
-				update_file(o, 0, dst_other.sha1, dst_other.mode, new_path);
+				if (o->call_depth) {
+					struct merge_file_info mfi;
+					struct diff_filespec one, a, b;
+
+					one.path = a.path = b.path =
+						(char *)ren1_dst;
+					hashcpy(one.sha1, null_sha1);
+					one.mode = 0;
+					hashcpy(a.sha1, ren1->pair->two->sha1);
+					a.mode = ren1->pair->two->mode;
+					hashcpy(b.sha1, dst_other.sha1);
+					b.mode = dst_other.mode;
+					mfi = merge_file(o, &one, &a, &b,
+							 branch1,
+							 branch2);
+					output(o, 1, "Adding merged %s", ren1_dst);
+					update_file(o, 0,
+						    mfi.sha,
+						    mfi.mode,
+						    ren1_dst);
+				} else {
+					new_path = unique_path(o, ren1_dst, branch2);
+					output(o, 1, "Adding as %s instead", new_path);
+					update_file(o, 0, dst_other.sha1, dst_other.mode, new_path);
+				}
 			} else if ((item = string_list_lookup(ren1_dst, renames2Dst))) {
 				ren2 = item->util;
 				clean_merge = 0;
@@ -1166,10 +1209,14 @@ int merge_trees(struct merge_options *o,
 
 	code = git_merge_trees(o->call_depth, common, head, merge);
 
-	if (code != 0)
-		die("merging of trees %s and %s failed",
-		    sha1_to_hex(head->object.sha1),
-		    sha1_to_hex(merge->object.sha1));
+	if (code != 0) {
+		if (show(o, 4) || o->call_depth)
+			die("merging of trees %s and %s failed",
+			    sha1_to_hex(head->object.sha1),
+			    sha1_to_hex(merge->object.sha1));
+		else
+			exit(128);
+	}
 
 	if (unmerged_cache()) {
 		struct string_list *entries, *re_head, *re_merge;