git-rebase: make --allow-empty-message the default
[gitweb.git] / merge-recursive.c
index a67bb58da72d2fd81e0189d3c59a6b28f4d6fe80..f110e1c5ecbd6254b25785ecb49f29cb7bb75ed2 100644 (file)
@@ -23,6 +23,7 @@
 #include "merge-recursive.h"
 #include "dir.h"
 #include "submodule.h"
+#include "revision.h"
 
 struct path_hashmap_entry {
        struct hashmap_entry e;
@@ -87,6 +88,29 @@ static void dir_rename_entry_init(struct dir_rename_entry *entry,
        string_list_init(&entry->possible_new_dirs, 0);
 }
 
+static struct collision_entry *collision_find_entry(struct hashmap *hashmap,
+                                                   char *target_file)
+{
+       struct collision_entry key;
+
+       hashmap_entry_init(&key, strhash(target_file));
+       key.target_file = target_file;
+       return hashmap_get(hashmap, &key, NULL);
+}
+
+static int collision_cmp(void *unused_cmp_data,
+                        const struct collision_entry *e1,
+                        const struct collision_entry *e2,
+                        const void *unused_keydata)
+{
+       return strcmp(e1->target_file, e2->target_file);
+}
+
+static void collision_init(struct hashmap *map)
+{
+       hashmap_init(map, (hashmap_cmp_fn) collision_cmp, NULL, 0);
+}
+
 static void flush_output(struct merge_options *o)
 {
        if (o->buffer_output < 2 && o->obuf.len) {
@@ -139,7 +163,7 @@ static struct commit *make_virtual_commit(struct tree *tree, const char *comment
        struct commit *commit = alloc_commit_node();
 
        set_merge_remote_desc(commit, comment, (struct object *)commit);
-       commit->tree = tree;
+       commit->maybe_tree = tree;
        commit->object.parsed = 1;
        return commit;
 }
@@ -157,6 +181,7 @@ static int oid_eq(const struct object_id *a, const struct object_id *b)
 
 enum rename_type {
        RENAME_NORMAL = 0,
+       RENAME_DIR,
        RENAME_DELETE,
        RENAME_ONE_FILE_TO_ONE,
        RENAME_ONE_FILE_TO_TWO,
@@ -292,7 +317,7 @@ static int add_cacheinfo(struct merge_options *o,
 
        ce = make_cache_entry(mode, oid ? oid->hash : null_sha1, path, stage, 0);
        if (!ce)
-               return err(o, _("addinfo_cache failed for path '%s'"), path);
+               return err(o, _("add_cacheinfo failed for path '%s'; merge aborting."), path);
 
        ret = add_cache_entry(ce, options);
        if (refresh) {
@@ -300,7 +325,7 @@ static int add_cacheinfo(struct merge_options *o,
 
                nce = refresh_cache_entry(ce, CE_MATCH_REFRESH | CE_MATCH_IGNORE_MISSING);
                if (!nce)
-                       return err(o, _("addinfo_cache failed for path '%s'"), path);
+                       return err(o, _("add_cacheinfo failed to refresh for path '%s'; merge aborting."), path);
                if (nce != ce)
                        ret = add_cache_entry(nce, options);
        }
@@ -313,36 +338,54 @@ static void init_tree_desc_from_tree(struct tree_desc *desc, struct tree *tree)
        init_tree_desc(desc, tree->buffer, tree->size);
 }
 
-static int git_merge_trees(int index_only,
-                          struct tree *common,
-                          struct tree *head,
-                          struct tree *merge)
+static int unpack_trees_start(struct merge_options *o,
+                             struct tree *common,
+                             struct tree *head,
+                             struct tree *merge)
 {
        int rc;
        struct tree_desc t[3];
-       struct unpack_trees_options opts;
+       struct index_state tmp_index = { NULL };
 
-       memset(&opts, 0, sizeof(opts));
-       if (index_only)
-               opts.index_only = 1;
+       memset(&o->unpack_opts, 0, sizeof(o->unpack_opts));
+       if (o->call_depth)
+               o->unpack_opts.index_only = 1;
        else
-               opts.update = 1;
-       opts.merge = 1;
-       opts.head_idx = 2;
-       opts.fn = threeway_merge;
-       opts.src_index = &the_index;
-       opts.dst_index = &the_index;
-       setup_unpack_trees_porcelain(&opts, "merge");
+               o->unpack_opts.update = 1;
+       o->unpack_opts.merge = 1;
+       o->unpack_opts.head_idx = 2;
+       o->unpack_opts.fn = threeway_merge;
+       o->unpack_opts.src_index = &the_index;
+       o->unpack_opts.dst_index = &tmp_index;
+       o->unpack_opts.aggressive = !merge_detect_rename(o);
+       setup_unpack_trees_porcelain(&o->unpack_opts, "merge");
 
        init_tree_desc_from_tree(t+0, common);
        init_tree_desc_from_tree(t+1, head);
        init_tree_desc_from_tree(t+2, merge);
 
-       rc = unpack_trees(3, t, &opts);
+       rc = unpack_trees(3, t, &o->unpack_opts);
        cache_tree_free(&active_cache_tree);
+
+       /*
+        * Update the_index to match the new results, AFTER saving a copy
+        * in o->orig_index.  Update src_index to point to the saved copy.
+        * (verify_uptodate() checks src_index, and the original index is
+        * the one that had the necessary modification timestamps.)
+        */
+       o->orig_index = the_index;
+       the_index = tmp_index;
+       o->unpack_opts.src_index = &o->orig_index;
+
        return rc;
 }
 
+static void unpack_trees_finish(struct merge_options *o)
+{
+       discard_index(&o->orig_index);
+       clear_unpack_trees_porcelain(&o->unpack_opts);
+}
+
 struct tree *write_tree_from_memory(struct merge_options *o)
 {
        struct tree *result = NULL;
@@ -356,7 +399,7 @@ struct tree *write_tree_from_memory(struct merge_options *o)
                                fprintf(stderr, "BUG: %d %.*s\n", ce_stage(ce),
                                        (int)ce_namelen(ce), ce->name);
                }
-               die("BUG: unmerged index entries in merge-recursive.c");
+               BUG("unmerged index entries in merge-recursive.c");
        }
 
        if (!active_cache_tree)
@@ -398,6 +441,21 @@ static void get_files_dirs(struct merge_options *o, struct tree *tree)
        read_tree_recursive(tree, "", 0, 0, &match_all, save_files_dirs, o);
 }
 
+static int get_tree_entry_if_blob(const struct object_id *tree,
+                                 const char *path,
+                                 struct object_id *hashy,
+                                 unsigned int *mode_o)
+{
+       int ret;
+
+       ret = get_tree_entry(tree, path, hashy, mode_o);
+       if (S_ISDIR(*mode_o)) {
+               oidcpy(hashy, &null_oid);
+               *mode_o = 0;
+       }
+       return ret;
+}
+
 /*
  * Returns an index_entry instance which doesn't have to correspond to
  * a real cache entry in Git's index.
@@ -408,12 +466,12 @@ static struct stage_data *insert_stage_data(const char *path,
 {
        struct string_list_item *item;
        struct stage_data *e = xcalloc(1, sizeof(struct stage_data));
-       get_tree_entry(&o->object.oid, path,
-                       &e->stages[1].oid, &e->stages[1].mode);
-       get_tree_entry(&a->object.oid, path,
-                       &e->stages[2].oid, &e->stages[2].mode);
-       get_tree_entry(&b->object.oid, path,
-                       &e->stages[3].oid, &e->stages[3].mode);
+       get_tree_entry_if_blob(&o->object.oid, path,
+                              &e->stages[1].oid, &e->stages[1].mode);
+       get_tree_entry_if_blob(&a->object.oid, path,
+                              &e->stages[2].oid, &e->stages[2].mode);
+       get_tree_entry_if_blob(&b->object.oid, path,
+                              &e->stages[3].oid, &e->stages[3].mode);
        item = string_list_insert(entries, path);
        item->util = e;
        return e;
@@ -572,6 +630,7 @@ struct rename {
         */
        struct stage_data *src_entry;
        struct stage_data *dst_entry;
+       unsigned add_turned_into_rename:1;
        unsigned processed:1;
 };
 
@@ -606,6 +665,27 @@ static int update_stages(struct merge_options *opt, const char *path,
        return 0;
 }
 
+static int update_stages_for_stage_data(struct merge_options *opt,
+                                       const char *path,
+                                       const struct stage_data *stage_data)
+{
+       struct diff_filespec o, a, b;
+
+       o.mode = stage_data->stages[1].mode;
+       oidcpy(&o.oid, &stage_data->stages[1].oid);
+
+       a.mode = stage_data->stages[2].mode;
+       oidcpy(&a.oid, &stage_data->stages[2].oid);
+
+       b.mode = stage_data->stages[3].mode;
+       oidcpy(&b.oid, &stage_data->stages[3].oid);
+
+       return update_stages(opt, path,
+                            is_null_oid(&o.oid) ? NULL : &o,
+                            is_null_oid(&a.oid) ? NULL : &a,
+                            is_null_oid(&b.oid) ? NULL : &b);
+}
+
 static void update_entry(struct stage_data *entry,
                         struct diff_filespec *o,
                         struct diff_filespec *a,
@@ -707,31 +787,92 @@ static int dir_in_way(const char *path, int check_working_copy, int empty_ok)
                !(empty_ok && is_empty_dir(path));
 }
 
-static int was_tracked(const char *path)
+/*
+ * Returns whether path was tracked in the index before the merge started,
+ * and its oid and mode match the specified values
+ */
+static int was_tracked_and_matches(struct merge_options *o, const char *path,
+                                  const struct object_id *oid, unsigned mode)
 {
-       int pos = cache_name_pos(path, strlen(path));
+       int pos = index_name_pos(&o->orig_index, path, strlen(path));
+       struct cache_entry *ce;
+
+       if (0 > pos)
+               /* we were not tracking this path before the merge */
+               return 0;
+
+       /* See if the file we were tracking before matches */
+       ce = o->orig_index.cache[pos];
+       return (oid_eq(&ce->oid, oid) && ce->ce_mode == mode);
+}
+
+/*
+ * Returns whether path was tracked in the index before the merge started
+ */
+static int was_tracked(struct merge_options *o, const char *path)
+{
+       int pos = index_name_pos(&o->orig_index, path, strlen(path));
 
        if (0 <= pos)
-               /* we have been tracking this path */
+               /* we were tracking this path before the merge */
                return 1;
 
-       /*
-        * Look for an unmerged entry for the path,
-        * specifically stage #2, which would indicate
-        * that "our" side before the merge started
-        * had the path tracked (and resulted in a conflict).
-        */
-       for (pos = -1 - pos;
-            pos < active_nr && !strcmp(path, active_cache[pos]->name);
-            pos++)
-               if (ce_stage(active_cache[pos]) == 2)
-                       return 1;
        return 0;
 }
 
 static int would_lose_untracked(const char *path)
 {
-       return !was_tracked(path) && file_exists(path);
+       /*
+        * This may look like it can be simplified to:
+        *   return !was_tracked(o, path) && file_exists(path)
+        * but it can't.  This function needs to know whether path was in
+        * the working tree due to EITHER having been tracked in the index
+        * before the merge OR having been put into the working copy and
+        * index by unpack_trees().  Due to that either-or requirement, we
+        * check the current index instead of the original one.
+        *
+        * Note that we do not need to worry about merge-recursive itself
+        * updating the index after unpack_trees() and before calling this
+        * function, because we strictly require all code paths in
+        * merge-recursive to update the working tree first and the index
+        * second.  Doing otherwise would break
+        * update_file()/would_lose_untracked(); see every comment in this
+        * file which mentions "update_stages".
+        */
+       int pos = cache_name_pos(path, strlen(path));
+
+       if (pos < 0)
+               pos = -1 - pos;
+       while (pos < active_nr &&
+              !strcmp(path, active_cache[pos]->name)) {
+               /*
+                * If stage #0, it is definitely tracked.
+                * If it has stage #2 then it was tracked
+                * before this merge started.  All other
+                * cases the path was not tracked.
+                */
+               switch (ce_stage(active_cache[pos])) {
+               case 0:
+               case 2:
+                       return 0;
+               }
+               pos++;
+       }
+       return file_exists(path);
+}
+
+static int was_dirty(struct merge_options *o, const char *path)
+{
+       struct cache_entry *ce;
+       int dirty = 1;
+
+       if (o->call_depth || !was_tracked(o, path))
+               return !dirty;
+
+       ce = index_file_exists(o->unpack_opts.src_index,
+                              path, strlen(path), ignore_case);
+       dirty = verify_uptodate(ce, &o->unpack_opts) != 0;
+       return dirty;
 }
 
 static int make_room_for_path(struct merge_options *o, const char *path)
@@ -862,7 +1003,9 @@ static int update_file_flags(struct merge_options *o,
        }
  update_index:
        if (!ret && update_cache)
-               add_cacheinfo(o, mode, oid, path, 0, update_wd, ADD_CACHE_OK_TO_ADD);
+               if (add_cacheinfo(o, mode, oid, path, 0, update_wd,
+                                 ADD_CACHE_OK_TO_ADD))
+                       return -1;
        return ret;
 }
 
@@ -946,13 +1089,193 @@ static int merge_3way(struct merge_options *o,
        return merge_status;
 }
 
+static int find_first_merges(struct object_array *result, const char *path,
+               struct commit *a, struct commit *b)
+{
+       int i, j;
+       struct object_array merges = OBJECT_ARRAY_INIT;
+       struct commit *commit;
+       int contains_another;
+
+       char merged_revision[42];
+       const char *rev_args[] = { "rev-list", "--merges", "--ancestry-path",
+                                  "--all", merged_revision, NULL };
+       struct rev_info revs;
+       struct setup_revision_opt rev_opts;
+
+       memset(result, 0, sizeof(struct object_array));
+       memset(&rev_opts, 0, sizeof(rev_opts));
+
+       /* get all revisions that merge commit a */
+       xsnprintf(merged_revision, sizeof(merged_revision), "^%s",
+                       oid_to_hex(&a->object.oid));
+       init_revisions(&revs, NULL);
+       rev_opts.submodule = path;
+       /* FIXME: can't handle linked worktrees in submodules yet */
+       revs.single_worktree = path != NULL;
+       setup_revisions(ARRAY_SIZE(rev_args)-1, rev_args, &revs, &rev_opts);
+
+       /* save all revisions from the above list that contain b */
+       if (prepare_revision_walk(&revs))
+               die("revision walk setup failed");
+       while ((commit = get_revision(&revs)) != NULL) {
+               struct object *o = &(commit->object);
+               if (in_merge_bases(b, commit))
+                       add_object_array(o, NULL, &merges);
+       }
+       reset_revision_walk();
+
+       /* Now we've got all merges that contain a and b. Prune all
+        * merges that contain another found merge and save them in
+        * result.
+        */
+       for (i = 0; i < merges.nr; i++) {
+               struct commit *m1 = (struct commit *) merges.objects[i].item;
+
+               contains_another = 0;
+               for (j = 0; j < merges.nr; j++) {
+                       struct commit *m2 = (struct commit *) merges.objects[j].item;
+                       if (i != j && in_merge_bases(m2, m1)) {
+                               contains_another = 1;
+                               break;
+                       }
+               }
+
+               if (!contains_another)
+                       add_object_array(merges.objects[i].item, NULL, result);
+       }
+
+       object_array_clear(&merges);
+       return result->nr;
+}
+
+static void print_commit(struct commit *commit)
+{
+       struct strbuf sb = STRBUF_INIT;
+       struct pretty_print_context ctx = {0};
+       ctx.date_mode.type = DATE_NORMAL;
+       format_commit_message(commit, " %h: %m %s", &sb, &ctx);
+       fprintf(stderr, "%s\n", sb.buf);
+       strbuf_release(&sb);
+}
+
+static int merge_submodule(struct merge_options *o,
+                          struct object_id *result, const char *path,
+                          const struct object_id *base, const struct object_id *a,
+                          const struct object_id *b)
+{
+       struct commit *commit_base, *commit_a, *commit_b;
+       int parent_count;
+       struct object_array merges;
+
+       int i;
+       int search = !o->call_depth;
+
+       /* store a in result in case we fail */
+       oidcpy(result, a);
+
+       /* we can not handle deletion conflicts */
+       if (is_null_oid(base))
+               return 0;
+       if (is_null_oid(a))
+               return 0;
+       if (is_null_oid(b))
+               return 0;
+
+       if (add_submodule_odb(path)) {
+               output(o, 1, _("Failed to merge submodule %s (not checked out)"), path);
+               return 0;
+       }
+
+       if (!(commit_base = lookup_commit_reference(base)) ||
+           !(commit_a = lookup_commit_reference(a)) ||
+           !(commit_b = lookup_commit_reference(b))) {
+               output(o, 1, _("Failed to merge submodule %s (commits not present)"), path);
+               return 0;
+       }
+
+       /* check whether both changes are forward */
+       if (!in_merge_bases(commit_base, commit_a) ||
+           !in_merge_bases(commit_base, commit_b)) {
+               output(o, 1, _("Failed to merge submodule %s (commits don't follow merge-base)"), path);
+               return 0;
+       }
+
+       /* Case #1: a is contained in b or vice versa */
+       if (in_merge_bases(commit_a, commit_b)) {
+               oidcpy(result, b);
+               if (show(o, 3)) {
+                       output(o, 3, _("Fast-forwarding submodule %s to the following commit:"), path);
+                       output_commit_title(o, commit_b);
+               } else if (show(o, 2))
+                       output(o, 2, _("Fast-forwarding submodule %s"), path);
+               else
+                       ; /* no output */
+
+               return 1;
+       }
+       if (in_merge_bases(commit_b, commit_a)) {
+               oidcpy(result, a);
+               if (show(o, 3)) {
+                       output(o, 3, _("Fast-forwarding submodule %s to the following commit:"), path);
+                       output_commit_title(o, commit_a);
+               } else if (show(o, 2))
+                       output(o, 2, _("Fast-forwarding submodule %s"), path);
+               else
+                       ; /* no output */
+
+               return 1;
+       }
+
+       /*
+        * Case #2: There are one or more merges that contain a and b in
+        * the submodule. If there is only one, then present it as a
+        * suggestion to the user, but leave it marked unmerged so the
+        * user needs to confirm the resolution.
+        */
+
+       /* Skip the search if makes no sense to the calling context.  */
+       if (!search)
+               return 0;
+
+       /* find commit which merges them */
+       parent_count = find_first_merges(&merges, path, commit_a, commit_b);
+       switch (parent_count) {
+       case 0:
+               output(o, 1, _("Failed to merge submodule %s (merge following commits not found)"), path);
+               break;
+
+       case 1:
+               output(o, 1, _("Failed to merge submodule %s (not fast-forward)"), path);
+               output(o, 2, _("Found a possible merge resolution for the submodule:\n"));
+               print_commit((struct commit *) merges.objects[0].item);
+               output(o, 2, _(
+                       "If this is correct simply add it to the index "
+                       "for example\n"
+                       "by using:\n\n"
+                       "  git update-index --cacheinfo 160000 %s \"%s\"\n\n"
+                       "which will accept this suggestion.\n"),
+                       oid_to_hex(&merges.objects[0].item->oid), path);
+               break;
+
+       default:
+               output(o, 1, _("Failed to merge submodule %s (multiple merges found)"), path);
+               for (i = 0; i < merges.nr; i++)
+                       print_commit((struct commit *) merges.objects[i].item);
+       }
+
+       object_array_clear(&merges);
+       return 0;
+}
+
 static int merge_file_1(struct merge_options *o,
-                                          const struct diff_filespec *one,
-                                          const struct diff_filespec *a,
-                                          const struct diff_filespec *b,
-                                          const char *branch1,
-                                          const char *branch2,
-                                          struct merge_file_info *result)
+                       const struct diff_filespec *one,
+                       const struct diff_filespec *a,
+                       const struct diff_filespec *b,
+                       const char *filename,
+                       const char *branch1,
+                       const char *branch2,
+                       struct merge_file_info *result)
 {
        result->merge = 0;
        result->clean = 1;
@@ -1008,12 +1331,11 @@ static int merge_file_1(struct merge_options *o,
                                return ret;
                        result->clean = (merge_status == 0);
                } else if (S_ISGITLINK(a->mode)) {
-                       result->clean = merge_submodule(&result->oid,
+                       result->clean = merge_submodule(o, &result->oid,
                                                       one->path,
                                                       &one->oid,
                                                       &a->oid,
-                                                      &b->oid,
-                                                      !o->call_depth);
+                                                      &b->oid);
                } else if (S_ISLNK(a->mode)) {
                        switch (o->recursive_variant) {
                        case MERGE_RECURSIVE_NORMAL:
@@ -1029,21 +1351,25 @@ static int merge_file_1(struct merge_options *o,
                                break;
                        }
                } else
-                       die("BUG: unsupported object type in the tree");
+                       BUG("unsupported object type in the tree");
        }
 
+       if (result->merge)
+               output(o, 2, _("Auto-merging %s"), filename);
+
        return 0;
 }
 
 static int merge_file_special_markers(struct merge_options *o,
-                          const struct diff_filespec *one,
-                          const struct diff_filespec *a,
-                          const struct diff_filespec *b,
-                          const char *branch1,
-                          const char *filename1,
-                          const char *branch2,
-                          const char *filename2,
-                          struct merge_file_info *mfi)
+                                     const struct diff_filespec *one,
+                                     const struct diff_filespec *a,
+                                     const struct diff_filespec *b,
+                                     const char *target_filename,
+                                     const char *branch1,
+                                     const char *filename1,
+                                     const char *branch2,
+                                     const char *filename2,
+                                     struct merge_file_info *mfi)
 {
        char *side1 = NULL;
        char *side2 = NULL;
@@ -1054,22 +1380,23 @@ static int merge_file_special_markers(struct merge_options *o,
        if (filename2)
                side2 = xstrfmt("%s:%s", branch2, filename2);
 
-       ret = merge_file_1(o, one, a, b,
+       ret = merge_file_1(o, one, a, b, target_filename,
                           side1 ? side1 : branch1,
                           side2 ? side2 : branch2, mfi);
+
        free(side1);
        free(side2);
        return ret;
 }
 
 static int merge_file_one(struct merge_options *o,
-                                        const char *path,
-                                        const struct object_id *o_oid, int o_mode,
-                                        const struct object_id *a_oid, int a_mode,
-                                        const struct object_id *b_oid, int b_mode,
-                                        const char *branch1,
-                                        const char *branch2,
-                                        struct merge_file_info *mfi)
+                         const char *path,
+                         const struct object_id *o_oid, int o_mode,
+                         const struct object_id *a_oid, int a_mode,
+                         const struct object_id *b_oid, int b_mode,
+                         const char *branch1,
+                         const char *branch2,
+                         struct merge_file_info *mfi)
 {
        struct diff_filespec one, a, b;
 
@@ -1080,7 +1407,39 @@ static int merge_file_one(struct merge_options *o,
        a.mode = a_mode;
        oidcpy(&b.oid, b_oid);
        b.mode = b_mode;
-       return merge_file_1(o, &one, &a, &b, branch1, branch2, mfi);
+       return merge_file_1(o, &one, &a, &b, path, branch1, branch2, mfi);
+}
+
+static int conflict_rename_dir(struct merge_options *o,
+                              struct diff_filepair *pair,
+                              const char *rename_branch,
+                              const char *other_branch)
+{
+       const struct diff_filespec *dest = pair->two;
+
+       if (!o->call_depth && would_lose_untracked(dest->path)) {
+               char *alt_path = unique_path(o, dest->path, rename_branch);
+
+               output(o, 1, _("Error: Refusing to lose untracked file at %s; "
+                              "writing to %s instead."),
+                      dest->path, alt_path);
+               /*
+                * Write the file in worktree at alt_path, but not in the
+                * index.  Instead, write to dest->path for the index but
+                * only at the higher appropriate stage.
+                */
+               if (update_file(o, 0, &dest->oid, dest->mode, alt_path))
+                       return -1;
+               free(alt_path);
+               return update_stages(o, dest->path, NULL,
+                                    rename_branch == o->branch1 ? dest : NULL,
+                                    rename_branch == o->branch1 ? NULL : dest);
+       }
+
+       /* Update dest->path both in index and in worktree */
+       if (update_file(o, 1, &dest->oid, dest->mode, dest->path))
+               return -1;
+       return 0;
 }
 
 static int handle_change_delete(struct merge_options *o,
@@ -1096,7 +1455,8 @@ static int handle_change_delete(struct merge_options *o,
        const char *update_path = path;
        int ret = 0;
 
-       if (dir_in_way(path, !o->call_depth, 0)) {
+       if (dir_in_way(path, !o->call_depth, 0) ||
+           (!o->call_depth && would_lose_untracked(path))) {
                update_path = alt_path = unique_path(o, path, change_branch);
        }
 
@@ -1211,17 +1571,34 @@ static int handle_file(struct merge_options *o,
 
        add = filespec_from_entry(&other, dst_entry, stage ^ 1);
        if (add) {
+               int ren_src_was_dirty = was_dirty(o, rename->path);
                char *add_name = unique_path(o, rename->path, other_branch);
                if (update_file(o, 0, &add->oid, add->mode, add_name))
                        return -1;
 
-               remove_file(o, 0, rename->path, 0);
+               if (ren_src_was_dirty) {
+                       output(o, 1, _("Refusing to lose dirty file at %s"),
+                              rename->path);
+               }
+               /*
+                * Because the double negatives somehow keep confusing me...
+                *    1) update_wd iff !ren_src_was_dirty.
+                *    2) no_wd iff !update_wd
+                *    3) so, no_wd == !!ren_src_was_dirty == ren_src_was_dirty
+                */
+               remove_file(o, 0, rename->path, ren_src_was_dirty);
                dst_name = unique_path(o, rename->path, cur_branch);
        } else {
                if (dir_in_way(rename->path, !o->call_depth, 0)) {
                        dst_name = unique_path(o, rename->path, cur_branch);
                        output(o, 1, _("%s is a directory in %s adding as %s instead"),
                               rename->path, other_branch, dst_name);
+               } else if (!o->call_depth &&
+                          would_lose_untracked(rename->path)) {
+                       dst_name = unique_path(o, rename->path, cur_branch);
+                       output(o, 1, _("Refusing to lose untracked file at %s; "
+                                      "adding as %s instead"),
+                              rename->path, dst_name);
                }
        }
        if ((ret = update_file(o, 0, &rename->oid, rename->mode, dst_name)))
@@ -1308,6 +1685,8 @@ static int conflict_rename_rename_2to1(struct merge_options *o,
        struct diff_filespec *c1 = ci->pair1->two;
        struct diff_filespec *c2 = ci->pair2->two;
        char *path = c1->path; /* == c2->path */
+       char *path_side_1_desc;
+       char *path_side_2_desc;
        struct merge_file_info mfi_c1;
        struct merge_file_info mfi_c2;
        int ret;
@@ -1321,13 +1700,19 @@ static int conflict_rename_rename_2to1(struct merge_options *o,
        remove_file(o, 1, a->path, o->call_depth || would_lose_untracked(a->path));
        remove_file(o, 1, b->path, o->call_depth || would_lose_untracked(b->path));
 
+       path_side_1_desc = xstrfmt("%s (was %s)", path, a->path);
+       path_side_2_desc = xstrfmt("%s (was %s)", path, b->path);
        if (merge_file_special_markers(o, a, c1, &ci->ren1_other,
+                                      path_side_1_desc,
                                       o->branch1, c1->path,
                                       o->branch2, ci->ren1_other.path, &mfi_c1) ||
            merge_file_special_markers(o, b, &ci->ren2_other, c2,
+                                      path_side_2_desc,
                                       o->branch1, ci->ren2_other.path,
                                       o->branch2, c2->path, &mfi_c2))
                return -1;
+       free(path_side_1_desc);
+       free(path_side_2_desc);
 
        if (o->call_depth) {
                /*
@@ -1347,11 +1732,43 @@ static int conflict_rename_rename_2to1(struct merge_options *o,
                char *new_path2 = unique_path(o, path, ci->branch2);
                output(o, 1, _("Renaming %s to %s and %s to %s instead"),
                       a->path, new_path1, b->path, new_path2);
-               remove_file(o, 0, path, 0);
+               if (was_dirty(o, path))
+                       output(o, 1, _("Refusing to lose dirty file at %s"),
+                              path);
+               else if (would_lose_untracked(path))
+                       /*
+                        * Only way we get here is if both renames were from
+                        * a directory rename AND user had an untracked file
+                        * at the location where both files end up after the
+                        * two directory renames.  See testcase 10d of t6043.
+                        */
+                       output(o, 1, _("Refusing to lose untracked file at "
+                                      "%s, even though it's in the way."),
+                              path);
+               else
+                       remove_file(o, 0, path, 0);
                ret = update_file(o, 0, &mfi_c1.oid, mfi_c1.mode, new_path1);
                if (!ret)
                        ret = update_file(o, 0, &mfi_c2.oid, mfi_c2.mode,
                                          new_path2);
+               /*
+                * unpack_trees() actually populates the index for us for
+                * "normal" rename/rename(2to1) situtations so that the
+                * correct entries are at the higher stages, which would
+                * make the call below to update_stages_for_stage_data
+                * unnecessary.  However, if either of the renames came
+                * from a directory rename, then unpack_trees() will not
+                * have gotten the right data loaded into the index, so we
+                * need to do so now.  (While it'd be tempting to move this
+                * call to update_stages_for_stage_data() to
+                * apply_directory_rename_modifications(), that would break
+                * our intermediate calls to would_lose_untracked() since
+                * those rely on the current in-memory index.  See also the
+                * big "NOTE" in update_stages()).
+                */
+               if (update_stages_for_stage_data(o, path, ci->dst_entry1))
+                       ret = -1;
+
                free(new_path2);
                free(new_path1);
        }
@@ -1372,7 +1789,15 @@ static struct diff_queue_struct *get_diffpairs(struct merge_options *o,
        diff_setup(&opts);
        opts.flags.recursive = 1;
        opts.flags.rename_empty = 0;
-       opts.detect_rename = DIFF_DETECT_RENAME;
+       opts.detect_rename = merge_detect_rename(o);
+       /*
+        * We do not have logic to handle the detection of copies.  In
+        * fact, it may not even make sense to add such logic: would we
+        * really want a change to a base file to be propagated through
+        * multiple other files by a merge?
+        */
+       if (opts.detect_rename > DIFF_DETECT_RENAME)
+               opts.detect_rename = DIFF_DETECT_RENAME;
        opts.rename_limit = o->merge_rename_limit >= 0 ? o->merge_rename_limit :
                            o->diff_rename_limit >= 0 ? o->diff_rename_limit :
                            1000;
@@ -1404,6 +1829,31 @@ static int tree_has_path(struct tree *tree, const char *path)
                               &hashy, &mode_o);
 }
 
+/*
+ * Return a new string that replaces the beginning portion (which matches
+ * entry->dir), with entry->new_dir.  In perl-speak:
+ *   new_path_name = (old_path =~ s/entry->dir/entry->new_dir/);
+ * NOTE:
+ *   Caller must ensure that old_path starts with entry->dir + '/'.
+ */
+static char *apply_dir_rename(struct dir_rename_entry *entry,
+                             const char *old_path)
+{
+       struct strbuf new_path = STRBUF_INIT;
+       int oldlen, newlen;
+
+       if (entry->non_unique_new_dir)
+               return NULL;
+
+       oldlen = strlen(entry->dir);
+       newlen = entry->new_dir.len + (strlen(old_path) - oldlen) + 1;
+       strbuf_grow(&new_path, newlen);
+       strbuf_addbuf(&new_path, &entry->new_dir);
+       strbuf_addstr(&new_path, &old_path[oldlen]);
+
+       return strbuf_detach(&new_path, NULL);
+}
+
 static void get_renamed_dir_portion(const char *old_path, const char *new_path,
                                    char **old_dir, char **new_dir)
 {
@@ -1472,6 +1922,91 @@ static void remove_hashmap_entries(struct hashmap *dir_renames,
        string_list_clear(items_to_remove, 0);
 }
 
+/*
+ * See if there is a directory rename for path, and if there are any file
+ * level conflicts for the renamed location.  If there is a rename and
+ * there are no conflicts, return the new name.  Otherwise, return NULL.
+ */
+static char *handle_path_level_conflicts(struct merge_options *o,
+                                        const char *path,
+                                        struct dir_rename_entry *entry,
+                                        struct hashmap *collisions,
+                                        struct tree *tree)
+{
+       char *new_path = NULL;
+       struct collision_entry *collision_ent;
+       int clean = 1;
+       struct strbuf collision_paths = STRBUF_INIT;
+
+       /*
+        * entry has the mapping of old directory name to new directory name
+        * that we want to apply to path.
+        */
+       new_path = apply_dir_rename(entry, path);
+
+       if (!new_path) {
+               /* This should only happen when entry->non_unique_new_dir set */
+               if (!entry->non_unique_new_dir)
+                       BUG("entry->non_unqiue_dir not set and !new_path");
+               output(o, 1, _("CONFLICT (directory rename split): "
+                              "Unclear where to place %s because directory "
+                              "%s was renamed to multiple other directories, "
+                              "with no destination getting a majority of the "
+                              "files."),
+                      path, entry->dir);
+               clean = 0;
+               return NULL;
+       }
+
+       /*
+        * The caller needs to have ensured that it has pre-populated
+        * collisions with all paths that map to new_path.  Do a quick check
+        * to ensure that's the case.
+        */
+       collision_ent = collision_find_entry(collisions, new_path);
+       if (collision_ent == NULL)
+               BUG("collision_ent is NULL");
+
+       /*
+        * Check for one-sided add/add/.../add conflicts, i.e.
+        * where implicit renames from the other side doing
+        * directory rename(s) can affect this side of history
+        * to put multiple paths into the same location.  Warn
+        * and bail on directory renames for such paths.
+        */
+       if (collision_ent->reported_already) {
+               clean = 0;
+       } else if (tree_has_path(tree, new_path)) {
+               collision_ent->reported_already = 1;
+               strbuf_add_separated_string_list(&collision_paths, ", ",
+                                                &collision_ent->source_files);
+               output(o, 1, _("CONFLICT (implicit dir rename): Existing "
+                              "file/dir at %s in the way of implicit "
+                              "directory rename(s) putting the following "
+                              "path(s) there: %s."),
+                      new_path, collision_paths.buf);
+               clean = 0;
+       } else if (collision_ent->source_files.nr > 1) {
+               collision_ent->reported_already = 1;
+               strbuf_add_separated_string_list(&collision_paths, ", ",
+                                                &collision_ent->source_files);
+               output(o, 1, _("CONFLICT (implicit dir rename): Cannot map "
+                              "more than one path to %s; implicit directory "
+                              "renames tried to put these paths there: %s"),
+                      new_path, collision_paths.buf);
+               clean = 0;
+       }
+
+       /* Free memory we no longer need */
+       strbuf_release(&collision_paths);
+       if (!clean && new_path) {
+               free(new_path);
+               return NULL;
+       }
+
+       return new_path;
+}
+
 /*
  * There are a couple things we want to do at the directory level:
  *   1. Check for both sides renaming to the same thing, in order to avoid
@@ -1673,6 +2208,247 @@ static struct hashmap *get_directory_renames(struct diff_queue_struct *pairs,
        return dir_renames;
 }
 
+static struct dir_rename_entry *check_dir_renamed(const char *path,
+                                                 struct hashmap *dir_renames)
+{
+       char *temp = xstrdup(path);
+       char *end;
+       struct dir_rename_entry *entry = NULL;;
+
+       while ((end = strrchr(temp, '/'))) {
+               *end = '\0';
+               entry = dir_rename_find_entry(dir_renames, temp);
+               if (entry)
+                       break;
+       }
+       free(temp);
+       return entry;
+}
+
+static void compute_collisions(struct hashmap *collisions,
+                              struct hashmap *dir_renames,
+                              struct diff_queue_struct *pairs)
+{
+       int i;
+
+       /*
+        * Multiple files can be mapped to the same path due to directory
+        * renames done by the other side of history.  Since that other
+        * side of history could have merged multiple directories into one,
+        * if our side of history added the same file basename to each of
+        * those directories, then all N of them would get implicitly
+        * renamed by the directory rename detection into the same path,
+        * and we'd get an add/add/.../add conflict, and all those adds
+        * from *this* side of history.  This is not representable in the
+        * index, and users aren't going to easily be able to make sense of
+        * it.  So we need to provide a good warning about what's
+        * happening, and fall back to no-directory-rename detection
+        * behavior for those paths.
+        *
+        * See testcases 9e and all of section 5 from t6043 for examples.
+        */
+       collision_init(collisions);
+
+       for (i = 0; i < pairs->nr; ++i) {
+               struct dir_rename_entry *dir_rename_ent;
+               struct collision_entry *collision_ent;
+               char *new_path;
+               struct diff_filepair *pair = pairs->queue[i];
+
+               if (pair->status != 'A' && pair->status != 'R')
+                       continue;
+               dir_rename_ent = check_dir_renamed(pair->two->path,
+                                                  dir_renames);
+               if (!dir_rename_ent)
+                       continue;
+
+               new_path = apply_dir_rename(dir_rename_ent, pair->two->path);
+               if (!new_path)
+                       /*
+                        * dir_rename_ent->non_unique_new_path is true, which
+                        * means there is no directory rename for us to use,
+                        * which means it won't cause us any additional
+                        * collisions.
+                        */
+                       continue;
+               collision_ent = collision_find_entry(collisions, new_path);
+               if (!collision_ent) {
+                       collision_ent = xcalloc(1,
+                                               sizeof(struct collision_entry));
+                       hashmap_entry_init(collision_ent, strhash(new_path));
+                       hashmap_put(collisions, collision_ent);
+                       collision_ent->target_file = new_path;
+               } else {
+                       free(new_path);
+               }
+               string_list_insert(&collision_ent->source_files,
+                                  pair->two->path);
+       }
+}
+
+static char *check_for_directory_rename(struct merge_options *o,
+                                       const char *path,
+                                       struct tree *tree,
+                                       struct hashmap *dir_renames,
+                                       struct hashmap *dir_rename_exclusions,
+                                       struct hashmap *collisions,
+                                       int *clean_merge)
+{
+       char *new_path = NULL;
+       struct dir_rename_entry *entry = check_dir_renamed(path, dir_renames);
+       struct dir_rename_entry *oentry = NULL;
+
+       if (!entry)
+               return new_path;
+
+       /*
+        * This next part is a little weird.  We do not want to do an
+        * implicit rename into a directory we renamed on our side, because
+        * that will result in a spurious rename/rename(1to2) conflict.  An
+        * example:
+        *   Base commit: dumbdir/afile, otherdir/bfile
+        *   Side 1:      smrtdir/afile, otherdir/bfile
+        *   Side 2:      dumbdir/afile, dumbdir/bfile
+        * Here, while working on Side 1, we could notice that otherdir was
+        * renamed/merged to dumbdir, and change the diff_filepair for
+        * otherdir/bfile into a rename into dumbdir/bfile.  However, Side
+        * 2 will notice the rename from dumbdir to smrtdir, and do the
+        * transitive rename to move it from dumbdir/bfile to
+        * smrtdir/bfile.  That gives us bfile in dumbdir vs being in
+        * smrtdir, a rename/rename(1to2) conflict.  We really just want
+        * the file to end up in smrtdir.  And the way to achieve that is
+        * to not let Side1 do the rename to dumbdir, since we know that is
+        * the source of one of our directory renames.
+        *
+        * That's why oentry and dir_rename_exclusions is here.
+        *
+        * As it turns out, this also prevents N-way transient rename
+        * confusion; See testcases 9c and 9d of t6043.
+        */
+       oentry = dir_rename_find_entry(dir_rename_exclusions, entry->new_dir.buf);
+       if (oentry) {
+               output(o, 1, _("WARNING: Avoiding applying %s -> %s rename "
+                              "to %s, because %s itself was renamed."),
+                      entry->dir, entry->new_dir.buf, path, entry->new_dir.buf);
+       } else {
+               new_path = handle_path_level_conflicts(o, path, entry,
+                                                      collisions, tree);
+               *clean_merge &= (new_path != NULL);
+       }
+
+       return new_path;
+}
+
+static void apply_directory_rename_modifications(struct merge_options *o,
+                                                struct diff_filepair *pair,
+                                                char *new_path,
+                                                struct rename *re,
+                                                struct tree *tree,
+                                                struct tree *o_tree,
+                                                struct tree *a_tree,
+                                                struct tree *b_tree,
+                                                struct string_list *entries,
+                                                int *clean)
+{
+       struct string_list_item *item;
+       int stage = (tree == a_tree ? 2 : 3);
+       int update_wd;
+
+       /*
+        * In all cases where we can do directory rename detection,
+        * unpack_trees() will have read pair->two->path into the
+        * index and the working copy.  We need to remove it so that
+        * we can instead place it at new_path.  It is guaranteed to
+        * not be untracked (unpack_trees() would have errored out
+        * saying the file would have been overwritten), but it might
+        * be dirty, though.
+        */
+       update_wd = !was_dirty(o, pair->two->path);
+       if (!update_wd)
+               output(o, 1, _("Refusing to lose dirty file at %s"),
+                      pair->two->path);
+       remove_file(o, 1, pair->two->path, !update_wd);
+
+       /* Find or create a new re->dst_entry */
+       item = string_list_lookup(entries, new_path);
+       if (item) {
+               /*
+                * Since we're renaming on this side of history, and it's
+                * due to a directory rename on the other side of history
+                * (which we only allow when the directory in question no
+                * longer exists on the other side of history), the
+                * original entry for re->dst_entry is no longer
+                * necessary...
+                */
+               re->dst_entry->processed = 1;
+
+               /*
+                * ...because we'll be using this new one.
+                */
+               re->dst_entry = item->util;
+       } else {
+               /*
+                * re->dst_entry is for the before-dir-rename path, and we
+                * need it to hold information for the after-dir-rename
+                * path.  Before creating a new entry, we need to mark the
+                * old one as unnecessary (...unless it is shared by
+                * src_entry, i.e. this didn't use to be a rename, in which
+                * case we can just allow the normal processing to happen
+                * for it).
+                */
+               if (pair->status == 'R')
+                       re->dst_entry->processed = 1;
+
+               re->dst_entry = insert_stage_data(new_path,
+                                                 o_tree, a_tree, b_tree,
+                                                 entries);
+               item = string_list_insert(entries, new_path);
+               item->util = re->dst_entry;
+       }
+
+       /*
+        * Update the stage_data with the information about the path we are
+        * moving into place.  That slot will be empty and available for us
+        * to write to because of the collision checks in
+        * handle_path_level_conflicts().  In other words,
+        * re->dst_entry->stages[stage].oid will be the null_oid, so it's
+        * open for us to write to.
+        *
+        * It may be tempting to actually update the index at this point as
+        * well, using update_stages_for_stage_data(), but as per the big
+        * "NOTE" in update_stages(), doing so will modify the current
+        * in-memory index which will break calls to would_lose_untracked()
+        * that we need to make.  Instead, we need to just make sure that
+        * the various conflict_rename_*() functions update the index
+        * explicitly rather than relying on unpack_trees() to have done it.
+        */
+       get_tree_entry(&tree->object.oid,
+                      pair->two->path,
+                      &re->dst_entry->stages[stage].oid,
+                      &re->dst_entry->stages[stage].mode);
+
+       /* Update pair status */
+       if (pair->status == 'A') {
+               /*
+                * Recording rename information for this add makes it look
+                * like a rename/delete conflict.  Make sure we can
+                * correctly handle this as an add that was moved to a new
+                * directory instead of reporting a rename/delete conflict.
+                */
+               re->add_turned_into_rename = 1;
+       }
+       /*
+        * We don't actually look at pair->status again, but it seems
+        * pedagogically correct to adjust it.
+        */
+       pair->status = 'R';
+
+       /*
+        * Finally, record the new location.
+        */
+       pair->two->path = new_path;
+}
+
 /*
  * Get information of all renames which occurred in 'pairs', making use of
  * any implicit directory renames inferred from the other side of history.
@@ -1682,28 +2458,47 @@ static struct hashmap *get_directory_renames(struct diff_queue_struct *pairs,
  */
 static struct string_list *get_renames(struct merge_options *o,
                                       struct diff_queue_struct *pairs,
+                                      struct hashmap *dir_renames,
+                                      struct hashmap *dir_rename_exclusions,
                                       struct tree *tree,
                                       struct tree *o_tree,
                                       struct tree *a_tree,
                                       struct tree *b_tree,
-                                      struct string_list *entries)
+                                      struct string_list *entries,
+                                      int *clean_merge)
 {
        int i;
+       struct hashmap collisions;
+       struct hashmap_iter iter;
+       struct collision_entry *e;
        struct string_list *renames;
 
+       compute_collisions(&collisions, dir_renames, pairs);
        renames = xcalloc(1, sizeof(struct string_list));
 
        for (i = 0; i < pairs->nr; ++i) {
                struct string_list_item *item;
                struct rename *re;
                struct diff_filepair *pair = pairs->queue[i];
+               char *new_path; /* non-NULL only with directory renames */
 
-               if (pair->status != 'R') {
+               if (pair->status != 'A' && pair->status != 'R') {
+                       diff_free_filepair(pair);
+                       continue;
+               }
+               new_path = check_for_directory_rename(o, pair->two->path, tree,
+                                                     dir_renames,
+                                                     dir_rename_exclusions,
+                                                     &collisions,
+                                                     clean_merge);
+               if (pair->status != 'R' && !new_path) {
                        diff_free_filepair(pair);
                        continue;
                }
+
                re = xmalloc(sizeof(*re));
                re->processed = 0;
+               re->add_turned_into_rename = 0;
                re->pair = pair;
                item = string_list_lookup(entries, re->pair->one->path);
                if (!item)
@@ -1720,7 +2515,20 @@ static struct string_list *get_renames(struct merge_options *o,
                        re->dst_entry = item->util;
                item = string_list_insert(renames, pair->one->path);
                item->util = re;
+               if (new_path)
+                       apply_directory_rename_modifications(o, pair, new_path,
+                                                            re, tree, o_tree,
+                                                            a_tree, b_tree,
+                                                            entries,
+                                                            clean_merge);
        }
+
+       hashmap_iter_init(&collisions, &iter);
+       while ((e = hashmap_iter_next(&iter))) {
+               free(e->target_file);
+               string_list_clear(&e->source_files, 0);
+       }
+       hashmap_free(&collisions, 1);
        return renames;
 }
 
@@ -1796,7 +2604,7 @@ static int process_renames(struct merge_options *o,
                        const char *ren2_dst = ren2->pair->two->path;
                        enum rename_type rename_type;
                        if (strcmp(ren1_src, ren2_src) != 0)
-                               die("BUG: ren1_src != ren2_src");
+                               BUG("ren1_src != ren2_src");
                        ren2->dst_entry->processed = 1;
                        ren2->processed = 1;
                        if (strcmp(ren1_dst, ren2_dst) != 0) {
@@ -1830,7 +2638,7 @@ static int process_renames(struct merge_options *o,
                        ren2 = lookup->util;
                        ren2_dst = ren2->pair->two->path;
                        if (strcmp(ren1_dst, ren2_dst) != 0)
-                               die("BUG: ren1_dst != ren2_dst");
+                               BUG("ren1_dst != ren2_dst");
 
                        clean_merge = 0;
                        ren2->processed = 1;
@@ -1872,7 +2680,7 @@ static int process_renames(struct merge_options *o,
                         * add-source case).
                         */
                        remove_file(o, 1, ren1_src,
-                                   renamed_stage == 2 || !was_tracked(ren1_src));
+                                   renamed_stage == 2 || !was_tracked(o, ren1_src));
 
                        oidcpy(&src_other.oid,
                               &ren1->src_entry->stages[other_stage].oid);
@@ -1882,7 +2690,19 @@ static int process_renames(struct merge_options *o,
                        dst_other.mode = ren1->dst_entry->stages[other_stage].mode;
                        try_merge = 0;
 
-                       if (oid_eq(&src_other.oid, &null_oid)) {
+                       if (oid_eq(&src_other.oid, &null_oid) &&
+                           ren1->add_turned_into_rename) {
+                               setup_rename_conflict_info(RENAME_DIR,
+                                                          ren1->pair,
+                                                          NULL,
+                                                          branch1,
+                                                          branch2,
+                                                          ren1->dst_entry,
+                                                          NULL,
+                                                          o,
+                                                          NULL,
+                                                          NULL);
+                       } else if (oid_eq(&src_other.oid, &null_oid)) {
                                setup_rename_conflict_info(RENAME_DELETE,
                                                           ren1->pair,
                                                           NULL,
@@ -2012,12 +2832,12 @@ static int handle_renames(struct merge_options *o,
 {
        struct diff_queue_struct *head_pairs, *merge_pairs;
        struct hashmap *dir_re_head, *dir_re_merge;
-       int clean;
+       int clean = 1;
 
        ri->head_renames = NULL;
        ri->merge_renames = NULL;
 
-       if (!o->detect_rename)
+       if (!merge_detect_rename(o))
                return 1;
 
        head_pairs = get_diffpairs(o, common, head);
@@ -2030,12 +2850,21 @@ static int handle_renames(struct merge_options *o,
                                         dir_re_head, head,
                                         dir_re_merge, merge);
 
-       ri->head_renames  = get_renames(o, head_pairs, head,
-                                        common, head, merge, entries);
-       ri->merge_renames = get_renames(o, merge_pairs, merge,
-                                        common, head, merge, entries);
-       clean = process_renames(o, ri->head_renames, ri->merge_renames);
+       ri->head_renames  = get_renames(o, head_pairs,
+                                       dir_re_merge, dir_re_head, head,
+                                       common, head, merge, entries,
+                                       &clean);
+       if (clean < 0)
+               goto cleanup;
+       ri->merge_renames = get_renames(o, merge_pairs,
+                                       dir_re_head, dir_re_merge, merge,
+                                       common, head, merge, entries,
+                                       &clean);
+       if (clean < 0)
+               goto cleanup;
+       clean &= process_renames(o, ri->head_renames, ri->merge_renames);
 
+cleanup:
        /*
         * Some cleanup is deferred until cleanup_renames() because the
         * data structures are still needed and referenced in
@@ -2159,6 +2988,7 @@ static int handle_modify_delete(struct merge_options *o,
 
 static int merge_content(struct merge_options *o,
                         const char *path,
+                        int is_dirty,
                         struct object_id *o_oid, int o_mode,
                         struct object_id *a_oid, int a_mode,
                         struct object_id *b_oid, int b_mode,
@@ -2199,29 +3029,26 @@ static int merge_content(struct merge_options *o,
                               S_ISGITLINK(pair1->two->mode)))
                        df_conflict_remains = 1;
        }
-       if (merge_file_special_markers(o, &one, &a, &b,
+       if (merge_file_special_markers(o, &one, &a, &b, path,
                                       o->branch1, path1,
                                       o->branch2, path2, &mfi))
                return -1;
 
-       if (mfi.clean && !df_conflict_remains &&
-           oid_eq(&mfi.oid, a_oid) && mfi.mode == a_mode) {
-               int path_renamed_outside_HEAD;
+       /*
+        * We can skip updating the working tree file iff:
+        *   a) The merge is clean
+        *   b) The merge matches what was in HEAD (content, mode, pathname)
+        *   c) The target path is usable (i.e. not involved in D/F conflict)
+        */
+       if (mfi.clean &&
+           was_tracked_and_matches(o, path, &mfi.oid, mfi.mode) &&
+           !df_conflict_remains) {
                output(o, 3, _("Skipped %s (merged same as existing)"), path);
-               /*
-                * The content merge resulted in the same file contents we
-                * already had.  We can return early if those file contents
-                * are recorded at the correct path (which may not be true
-                * if the merge involves a rename).
-                */
-               path_renamed_outside_HEAD = !path2 || !strcmp(path, path2);
-               if (!path_renamed_outside_HEAD) {
-                       add_cacheinfo(o, mfi.mode, &mfi.oid, path,
-                                     0, (!o->call_depth), 0);
-                       return mfi.clean;
-               }
-       } else
-               output(o, 2, _("Auto-merging %s"), path);
+               if (add_cacheinfo(o, mfi.mode, &mfi.oid, path,
+                                 0, (!o->call_depth && !is_dirty), 0))
+                       return -1;
+               return mfi.clean;
+       }
 
        if (!mfi.clean) {
                if (S_ISGITLINK(mfi.mode))
@@ -2233,7 +3060,7 @@ static int merge_content(struct merge_options *o,
                                return -1;
        }
 
-       if (df_conflict_remains) {
+       if (df_conflict_remains || is_dirty) {
                char *new_path;
                if (o->call_depth) {
                        remove_file_from_cache(path);
@@ -2242,7 +3069,7 @@ static int merge_content(struct merge_options *o,
                                if (update_stages(o, path, &one, &a, &b))
                                        return -1;
                        } else {
-                               int file_from_stage2 = was_tracked(path);
+                               int file_from_stage2 = was_tracked(o, path);
                                struct diff_filespec merged;
                                oidcpy(&merged.oid, &mfi.oid);
                                merged.mode = mfi.mode;
@@ -2255,6 +3082,10 @@ static int merge_content(struct merge_options *o,
 
                }
                new_path = unique_path(o, path, rename_conflict_info->branch1);
+               if (is_dirty) {
+                       output(o, 1, _("Refusing to lose dirty file at %s"),
+                              path);
+               }
                output(o, 1, _("Adding as %s instead"), new_path);
                if (update_file(o, 0, &mfi.oid, mfi.mode, new_path)) {
                        free(new_path);
@@ -2264,7 +3095,20 @@ static int merge_content(struct merge_options *o,
                mfi.clean = 0;
        } else if (update_file(o, mfi.clean, &mfi.oid, mfi.mode, path))
                return -1;
-       return mfi.clean;
+       return !is_dirty && mfi.clean;
+}
+
+static int conflict_rename_normal(struct merge_options *o,
+                                 const char *path,
+                                 struct object_id *o_oid, unsigned int o_mode,
+                                 struct object_id *a_oid, unsigned int a_mode,
+                                 struct object_id *b_oid, unsigned int b_mode,
+                                 struct rename_conflict_info *ci)
+{
+       /* Merge the content and write it out */
+       return merge_content(o, path, was_dirty(o, path),
+                            o_oid, o_mode, a_oid, a_mode, b_oid, b_mode,
+                            ci);
 }
 
 /* Per entry merge function */
@@ -2286,9 +3130,20 @@ static int process_entry(struct merge_options *o,
                switch (conflict_info->rename_type) {
                case RENAME_NORMAL:
                case RENAME_ONE_FILE_TO_ONE:
-                       clean_merge = merge_content(o, path,
-                                                   o_oid, o_mode, a_oid, a_mode, b_oid, b_mode,
-                                                   conflict_info);
+                       clean_merge = conflict_rename_normal(o,
+                                                            path,
+                                                            o_oid, o_mode,
+                                                            a_oid, a_mode,
+                                                            b_oid, b_mode,
+                                                            conflict_info);
+                       break;
+               case RENAME_DIR:
+                       clean_merge = 1;
+                       if (conflict_rename_dir(o,
+                                               conflict_info->pair1,
+                                               conflict_info->branch1,
+                                               conflict_info->branch2))
+                               clean_merge = -1;
                        break;
                case RENAME_DELETE:
                        clean_merge = 0;
@@ -2376,7 +3231,8 @@ static int process_entry(struct merge_options *o,
        } else if (a_oid && b_oid) {
                /* Case C: Added in both (check for same permissions) and */
                /* case D: Modified in both, but differently. */
-               clean_merge = merge_content(o, path,
+               int is_dirty = 0; /* unpack_trees would have bailed if dirty */
+               clean_merge = merge_content(o, path, is_dirty,
                                            o_oid, o_mode, a_oid, a_mode, b_oid, b_mode,
                                            NULL);
        } else if (!o_oid && !a_oid && !b_oid) {
@@ -2386,7 +3242,7 @@ static int process_entry(struct merge_options *o,
                 */
                remove_file(o, 1, path, !a_mode);
        } else
-               die("BUG: fatal merge failure, shouldn't happen.");
+               BUG("fatal merge failure, shouldn't happen.");
 
        return clean_merge;
 }
@@ -2417,13 +3273,14 @@ int merge_trees(struct merge_options *o,
                return 1;
        }
 
-       code = git_merge_trees(o->call_depth, common, head, merge);
+       code = unpack_trees_start(o, common, head, merge);
 
        if (code != 0) {
                if (show(o, 4) || o->call_depth)
                        err(o, _("merging of trees %s and %s failed"),
                            oid_to_hex(&head->object.oid),
                            oid_to_hex(&merge->object.oid));
+               unpack_trees_finish(o);
                return -1;
        }
 
@@ -2464,7 +3321,7 @@ int merge_trees(struct merge_options *o,
                for (i = 0; i < entries->nr; i++) {
                        struct stage_data *e = entries->items[i].util;
                        if (!e->processed)
-                               die("BUG: unprocessed path??? %s",
+                               BUG("unprocessed path??? %s",
                                    entries->items[i].string);
                }
 
@@ -2476,12 +3333,16 @@ int merge_trees(struct merge_options *o,
 
                hashmap_free(&o->current_file_dir_set, 1);
 
-               if (clean < 0)
+               if (clean < 0) {
+                       unpack_trees_finish(o);
                        return clean;
+               }
        }
        else
                clean = 1;
 
+       unpack_trees_finish(o);
+
        if (o->call_depth && !(*result = write_tree_from_memory(o)))
                return -1;
 
@@ -2575,7 +3436,8 @@ int merge_recursive(struct merge_options *o,
                read_cache();
 
        o->ancestor = "merged common ancestors";
-       clean = merge_trees(o, h1->tree, h2->tree, merged_common_ancestors->tree,
+       clean = merge_trees(o, get_commit_tree(h1), get_commit_tree(h2),
+                           get_commit_tree(merged_common_ancestors),
                            &mrtree);
        if (clean < 0) {
                flush_output(o);
@@ -2653,9 +3515,18 @@ int merge_recursive_generic(struct merge_options *o,
 
 static void merge_recursive_config(struct merge_options *o)
 {
+       char *value = NULL;
        git_config_get_int("merge.verbosity", &o->verbosity);
        git_config_get_int("diff.renamelimit", &o->diff_rename_limit);
        git_config_get_int("merge.renamelimit", &o->merge_rename_limit);
+       if (!git_config_get_string("diff.renames", &value)) {
+               o->diff_detect_rename = git_config_rename("diff.renames", value);
+               free(value);
+       }
+       if (!git_config_get_string("merge.renames", &value)) {
+               o->merge_detect_rename = git_config_rename("merge.renames", value);
+               free(value);
+       }
        git_config(git_xmerge_config, NULL);
 }
 
@@ -2668,7 +3539,8 @@ void init_merge_options(struct merge_options *o)
        o->diff_rename_limit = -1;
        o->merge_rename_limit = -1;
        o->renormalize = 0;
-       o->detect_rename = 1;
+       o->diff_detect_rename = -1;
+       o->merge_detect_rename = -1;
        merge_recursive_config(o);
        merge_verbosity = getenv("GIT_MERGE_VERBOSITY");
        if (merge_verbosity)
@@ -2719,16 +3591,16 @@ int parse_merge_opt(struct merge_options *o, const char *s)
        else if (!strcmp(s, "no-renormalize"))
                o->renormalize = 0;
        else if (!strcmp(s, "no-renames"))
-               o->detect_rename = 0;
+               o->merge_detect_rename = 0;
        else if (!strcmp(s, "find-renames")) {
-               o->detect_rename = 1;
+               o->merge_detect_rename = 1;
                o->rename_score = 0;
        }
        else if (skip_prefix(s, "find-renames=", &arg) ||
                 skip_prefix(s, "rename-threshold=", &arg)) {
                if ((o->rename_score = parse_rename_score(&arg)) == -1 || *arg != 0)
                        return -1;
-               o->detect_rename = 1;
+               o->merge_detect_rename = 1;
        }
        else
                return -1;