merge-recursive: introduce new functions to handle rename logic
[gitweb.git] / merge-recursive.c
index 129577987ba25402a6b9494b103a4643e2b37e68..40e142efdb9d37dc7370f24af1580a34ca1f4fb8 100644 (file)
@@ -228,7 +228,7 @@ static void output_commit_title(struct merge_options *o, struct commit *commit)
                strbuf_addf(&o->obuf, "virtual %s\n",
                        merge_remote_util(commit)->name);
        else {
-               strbuf_add_unique_abbrev(&o->obuf, commit->object.oid.hash,
+               strbuf_add_unique_abbrev(&o->obuf, &commit->object.oid,
                                         DEFAULT_ABBREV);
                strbuf_addch(&o->obuf, ' ');
                if (parse_commit(commit) != 0)
@@ -335,7 +335,7 @@ struct tree *write_tree_from_memory(struct merge_options *o)
        return result;
 }
 
-static int save_files_dirs(const unsigned char *sha1,
+static int save_files_dirs(const struct object_id *oid,
                struct strbuf *base, const char *path,
                unsigned int mode, int stage, void *context)
 {
@@ -370,12 +370,12 @@ 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.hash, path,
-                       e->stages[1].oid.hash, &e->stages[1].mode);
-       get_tree_entry(a->object.oid.hash, path,
-                       e->stages[2].oid.hash, &e->stages[2].mode);
-       get_tree_entry(b->object.oid.hash, path,
-                       e->stages[3].oid.hash, &e->stages[3].mode);
+       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);
        item = string_list_insert(entries, path);
        item->util = e;
        return e;
@@ -537,75 +537,6 @@ struct rename {
        unsigned processed:1;
 };
 
-/*
- * Get information of all renames which occurred between 'o_tree' and
- * 'tree'. We need the three trees in the merge ('o_tree', 'a_tree' and
- * 'b_tree') to be able to associate the correct cache entries with
- * the rename information. 'tree' is always equal to either a_tree or b_tree.
- */
-static struct string_list *get_renames(struct merge_options *o,
-                                      struct tree *tree,
-                                      struct tree *o_tree,
-                                      struct tree *a_tree,
-                                      struct tree *b_tree,
-                                      struct string_list *entries)
-{
-       int i;
-       struct string_list *renames;
-       struct diff_options opts;
-
-       renames = xcalloc(1, sizeof(struct string_list));
-       if (!o->detect_rename)
-               return renames;
-
-       diff_setup(&opts);
-       opts.flags.recursive = 1;
-       opts.flags.rename_empty = 0;
-       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;
-       opts.rename_score = o->rename_score;
-       opts.show_rename_progress = o->show_rename_progress;
-       opts.output_format = DIFF_FORMAT_NO_OUTPUT;
-       diff_setup_done(&opts);
-       diff_tree_oid(&o_tree->object.oid, &tree->object.oid, "", &opts);
-       diffcore_std(&opts);
-       if (opts.needed_rename_limit > o->needed_rename_limit)
-               o->needed_rename_limit = opts.needed_rename_limit;
-       for (i = 0; i < diff_queued_diff.nr; ++i) {
-               struct string_list_item *item;
-               struct rename *re;
-               struct diff_filepair *pair = diff_queued_diff.queue[i];
-               if (pair->status != 'R') {
-                       diff_free_filepair(pair);
-                       continue;
-               }
-               re = xmalloc(sizeof(*re));
-               re->processed = 0;
-               re->pair = pair;
-               item = string_list_lookup(entries, re->pair->one->path);
-               if (!item)
-                       re->src_entry = insert_stage_data(re->pair->one->path,
-                                       o_tree, a_tree, b_tree, entries);
-               else
-                       re->src_entry = item->util;
-
-               item = string_list_lookup(entries, re->pair->two->path);
-               if (!item)
-                       re->dst_entry = insert_stage_data(re->pair->two->path,
-                                       o_tree, a_tree, b_tree, entries);
-               else
-                       re->dst_entry = item->util;
-               item = string_list_insert(renames, pair->one->path);
-               item->util = re;
-       }
-       opts.output_format = DIFF_FORMAT_NO_OUTPUT;
-       diff_queued_diff.nr = 0;
-       diff_flush(&opts);
-       return renames;
-}
-
 static int update_stages(struct merge_options *opt, const char *path,
                         const struct diff_filespec *o,
                         const struct diff_filespec *a,
@@ -842,7 +773,7 @@ static int update_file_flags(struct merge_options *o,
                        goto update_index;
                }
 
-               buf = read_sha1_file(oid->hash, &type, &size);
+               buf = read_object_file(oid, &type, &size);
                if (!buf)
                        return err(o, _("cannot read object %s '%s'"), oid_to_hex(oid), path);
                if (type != OBJ_BLOB) {
@@ -1390,6 +1321,76 @@ static int conflict_rename_rename_2to1(struct merge_options *o,
        return ret;
 }
 
+/*
+ * Get information of all renames which occurred between 'o_tree' and
+ * 'tree'. We need the three trees in the merge ('o_tree', 'a_tree' and
+ * 'b_tree') to be able to associate the correct cache entries with
+ * the rename information. 'tree' is always equal to either a_tree or b_tree.
+ */
+static struct string_list *get_renames(struct merge_options *o,
+                                      struct tree *tree,
+                                      struct tree *o_tree,
+                                      struct tree *a_tree,
+                                      struct tree *b_tree,
+                                      struct string_list *entries)
+{
+       int i;
+       struct string_list *renames;
+       struct diff_options opts;
+
+       renames = xcalloc(1, sizeof(struct string_list));
+       if (!o->detect_rename)
+               return renames;
+
+       diff_setup(&opts);
+       opts.flags.recursive = 1;
+       opts.flags.rename_empty = 0;
+       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;
+       opts.rename_score = o->rename_score;
+       opts.show_rename_progress = o->show_rename_progress;
+       opts.output_format = DIFF_FORMAT_NO_OUTPUT;
+       diff_setup_done(&opts);
+       diff_tree_oid(&o_tree->object.oid, &tree->object.oid, "", &opts);
+       diffcore_std(&opts);
+       if (opts.needed_rename_limit > o->needed_rename_limit)
+               o->needed_rename_limit = opts.needed_rename_limit;
+       for (i = 0; i < diff_queued_diff.nr; ++i) {
+               struct string_list_item *item;
+               struct rename *re;
+               struct diff_filepair *pair = diff_queued_diff.queue[i];
+
+               if (pair->status != 'R') {
+                       diff_free_filepair(pair);
+                       continue;
+               }
+               re = xmalloc(sizeof(*re));
+               re->processed = 0;
+               re->pair = pair;
+               item = string_list_lookup(entries, re->pair->one->path);
+               if (!item)
+                       re->src_entry = insert_stage_data(re->pair->one->path,
+                                       o_tree, a_tree, b_tree, entries);
+               else
+                       re->src_entry = item->util;
+
+               item = string_list_lookup(entries, re->pair->two->path);
+               if (!item)
+                       re->dst_entry = insert_stage_data(re->pair->two->path,
+                                       o_tree, a_tree, b_tree, entries);
+               else
+                       re->dst_entry = item->util;
+               item = string_list_insert(renames, pair->one->path);
+               item->util = re;
+       }
+       opts.output_format = DIFF_FORMAT_NO_OUTPUT;
+       diff_queued_diff.nr = 0;
+       diff_flush(&opts);
+       return renames;
+}
+
 static int process_renames(struct merge_options *o,
                           struct string_list *a_renames,
                           struct string_list *b_renames)
@@ -1645,6 +1646,32 @@ static int process_renames(struct merge_options *o,
        return clean_merge;
 }
 
+struct rename_info {
+       struct string_list *head_renames;
+       struct string_list *merge_renames;
+};
+
+static int handle_renames(struct merge_options *o,
+                         struct tree *common,
+                         struct tree *head,
+                         struct tree *merge,
+                         struct string_list *entries,
+                         struct rename_info *ri)
+{
+       ri->head_renames  = get_renames(o, head, common, head, merge, entries);
+       ri->merge_renames = get_renames(o, merge, common, head, merge, entries);
+       return process_renames(o, ri->head_renames, ri->merge_renames);
+}
+
+static void cleanup_renames(struct rename_info *re_info)
+{
+       string_list_clear(re_info->head_renames, 0);
+       string_list_clear(re_info->merge_renames, 0);
+
+       free(re_info->head_renames);
+       free(re_info->merge_renames);
+}
+
 static struct object_id *stage_oid(const struct object_id *oid, unsigned mode)
 {
        return (is_null_oid(oid) || mode == 0) ? NULL: (struct object_id *)oid;
@@ -1656,7 +1683,7 @@ static int read_oid_strbuf(struct merge_options *o,
        void *buf;
        enum object_type type;
        unsigned long size;
-       buf = read_sha1_file(oid->hash, &type, &size);
+       buf = read_object_file(oid, &type, &size);
        if (!buf)
                return err(o, _("cannot read object %s"), oid_to_hex(oid));
        if (type != OBJ_BLOB) {
@@ -2004,7 +2031,8 @@ int merge_trees(struct merge_options *o,
        }
 
        if (unmerged_cache()) {
-               struct string_list *entries, *re_head, *re_merge;
+               struct string_list *entries;
+               struct rename_info re_info;
                int i;
                /*
                 * Only need the hashmap while processing entries, so
@@ -2018,9 +2046,8 @@ int merge_trees(struct merge_options *o,
                get_files_dirs(o, merge);
 
                entries = get_unmerged();
-               re_head  = get_renames(o, head, common, head, merge, entries);
-               re_merge = get_renames(o, merge, common, head, merge, entries);
-               clean = process_renames(o, re_head, re_merge);
+               clean = handle_renames(o, common, head, merge, entries,
+                                      &re_info);
                record_df_conflict_files(o, entries);
                if (clean < 0)
                        goto cleanup;
@@ -2045,16 +2072,13 @@ int merge_trees(struct merge_options *o,
                }
 
 cleanup:
-               string_list_clear(re_merge, 0);
-               string_list_clear(re_head, 0);
+               cleanup_renames(&re_info);
+
                string_list_clear(entries, 1);
+               free(entries);
 
                hashmap_free(&o->current_file_dir_set, 1);
 
-               free(re_merge);
-               free(re_head);
-               free(entries);
-
                if (clean < 0)
                        return clean;
        }
@@ -2090,7 +2114,7 @@ int merge_recursive(struct merge_options *o,
 {
        struct commit_list *iter;
        struct commit *merged_common_ancestors;
-       struct tree *mrtree = mrtree;
+       struct tree *mrtree;
        int clean;
 
        if (show(o, 4)) {
@@ -2223,10 +2247,9 @@ int merge_recursive_generic(struct merge_options *o,
                return clean;
        }
 
-       if (active_cache_changed &&
-           write_locked_index(&the_index, &lock, COMMIT_LOCK))
+       if (write_locked_index(&the_index, &lock,
+                              COMMIT_LOCK | SKIP_IF_UNCHANGED))
                return err(o, _("Unable to write index."));
-       rollback_lock_file(&lock);
 
        return clean ? 0 : 1;
 }