merge-recur: do not call git-write-tree

Since merge-recur is in C, and uses libgit, it can call the relevant
functions directly, without writing the index file.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: Junio C Hamano <junkio@cox.net>

diff --git a/merge-recursive.c b/merge-recursive.c
index f5c0080a512e4dfe8c74426bf559d13f2b7eaf2f..b8b095179bfb581611ced221e1bdcca2b05a07b9 100644 (file)
--- a/merge-recursive.c
+++ b/merge-recursive.c
@@ -248,38 +248,34 @@ static int git_merge_trees(int index_only,
        return rc;
 }
 
-/*
- * TODO: this can be streamlined by refactoring builtin-write-tree.c
- */
 static struct tree *git_write_tree(void)
 {
-       FILE *fp;
-       int rc;
-       char buf[41];
-       unsigned char sha1[20];
-       int ch;
-       unsigned i = 0;
+       struct tree *result = NULL;
+
        if (cache_dirty) {
+               unsigned i;
                for (i = 0; i < active_nr; i++) {
                        struct cache_entry *ce = active_cache[i];
                        if (ce_stage(ce))
                                return NULL;
                }
-               flush_cache();
-       }
-       fp = popen("git-write-tree 2>/dev/null", "r");
-       while ((ch = fgetc(fp)) != EOF)
-               if (i < sizeof(buf)-1 && ch >= '0' && ch <= 'f')
-                       buf[i++] = ch;
-               else
-                       break;
-       rc = pclose(fp);
-       if (rc == -1 || WEXITSTATUS(rc))
-               return NULL;
-       buf[i] = '\0';
-       if (get_sha1(buf, sha1) != 0)
-               return NULL;
-       return lookup_tree(sha1);
+       } else
+               read_cache_from(getenv("GIT_INDEX_FILE"));
+
+       if (!active_cache_tree)
+               active_cache_tree = cache_tree();
+
+       if (!cache_tree_fully_valid(active_cache_tree) &&
+                       cache_tree_update(active_cache_tree,
+                               active_cache, active_nr, 0, 0) < 0)
+               die("error building trees");
+
+       result = lookup_tree(active_cache_tree->sha1);
+
+       flush_cache();
+       cache_dirty = 0;
+
+       return result;
 }
 
 static int save_files_dirs(const unsigned char *sha1,