merge-recursive: Fix D/F conflicts
[gitweb.git] / merge-recursive.c
index cb53b01c19159e66ef265bde7feceabebab42232..c8d5362191151bf6b2fb418277b761b5cc6dbeee 100644 (file)
@@ -599,23 +599,6 @@ struct merge_file_info
                 merge:1;
 };
 
-static void fill_mm(const unsigned char *sha1, mmfile_t *mm)
-{
-       unsigned long size;
-       enum object_type type;
-
-       if (!hashcmp(sha1, null_sha1)) {
-               mm->ptr = xstrdup("");
-               mm->size = 0;
-               return;
-       }
-
-       mm->ptr = read_sha1_file(sha1, &type, &size);
-       if (!mm->ptr || type != OBJ_BLOB)
-               die("unable to read blob object %s", sha1_to_hex(sha1));
-       mm->size = size;
-}
-
 static int merge_3way(struct merge_options *o,
                      mmbuffer_t *result_buf,
                      struct diff_filespec *one,
@@ -625,7 +608,7 @@ static int merge_3way(struct merge_options *o,
                      const char *branch2)
 {
        mmfile_t orig, src1, src2;
-       char *name1, *name2;
+       char *base_name, *name1, *name2;
        int merge_status;
        int favor;
 
@@ -645,19 +628,24 @@ static int merge_3way(struct merge_options *o,
                }
        }
 
-       if (strcmp(a->path, b->path)) {
+       if (strcmp(a->path, b->path) ||
+           (o->ancestor != NULL && strcmp(a->path, one->path) != 0)) {
+               base_name = o->ancestor == NULL ? NULL :
+                       xstrdup(mkpath("%s:%s", o->ancestor, one->path));
                name1 = xstrdup(mkpath("%s:%s", branch1, a->path));
                name2 = xstrdup(mkpath("%s:%s", branch2, b->path));
        } else {
+               base_name = o->ancestor == NULL ? NULL :
+                       xstrdup(mkpath("%s", o->ancestor));
                name1 = xstrdup(mkpath("%s", branch1));
                name2 = xstrdup(mkpath("%s", branch2));
        }
 
-       fill_mm(one->sha1, &orig);
-       fill_mm(a->sha1, &src1);
-       fill_mm(b->sha1, &src2);
+       read_mmblob(&orig, one->sha1);
+       read_mmblob(&src1, a->sha1);
+       read_mmblob(&src2, b->sha1);
 
-       merge_status = ll_merge(result_buf, a->path, &orig,
+       merge_status = ll_merge(result_buf, a->path, &orig, base_name,
                                &src1, name1, &src2, name2,
                                (!!o->call_depth) | (favor << 1));
 
@@ -1084,6 +1072,7 @@ static int process_entry(struct merge_options *o,
        unsigned char *a_sha = stage_sha(entry->stages[2].sha, a_mode);
        unsigned char *b_sha = stage_sha(entry->stages[3].sha, b_mode);
 
+       entry->processed = 1;
        if (o_sha && (!a_sha || !b_sha)) {
                /* Case A: Deleted in one */
                if ((!a_sha && !b_sha) ||
@@ -1116,33 +1105,28 @@ static int process_entry(struct merge_options *o,
        } else if ((!o_sha && a_sha && !b_sha) ||
                   (!o_sha && !a_sha && b_sha)) {
                /* Case B: Added in one. */
-               const char *add_branch;
-               const char *other_branch;
                unsigned mode;
                const unsigned char *sha;
-               const char *conf;
 
                if (a_sha) {
-                       add_branch = o->branch1;
-                       other_branch = o->branch2;
                        mode = a_mode;
                        sha = a_sha;
-                       conf = "file/directory";
                } else {
-                       add_branch = o->branch2;
-                       other_branch = o->branch1;
                        mode = b_mode;
                        sha = b_sha;
-                       conf = "directory/file";
                }
                if (string_list_has_string(&o->current_directory_set, path)) {
-                       const char *new_path = unique_path(o, path, add_branch);
-                       clean_merge = 0;
-                       output(o, 1, "CONFLICT (%s): There is a directory with name %s in %s. "
-                              "Adding %s as %s",
-                              conf, path, other_branch, path, new_path);
-                       remove_file(o, 0, path, 0);
-                       update_file(o, 0, sha, mode, new_path);
+                       /* Handle D->F conflicts after all subfiles */
+                       entry->processed = 0;
+                       /* But get any file out of the way now, so conflicted
+                        * entries below the directory of the same name can
+                        * be put in the working directory.
+                        */
+                       if (a_sha)
+                               output(o, 2, "Removing %s", path);
+                       /* do not touch working file if it did not exist */
+                       remove_file(o, 0, path, !a_sha);
+                       return 1; /* Assume clean till processed */
                } else {
                        output(o, 2, "Adding %s", path);
                        update_file(o, 1, sha, mode, path);
@@ -1190,6 +1174,64 @@ static int process_entry(struct merge_options *o,
        return clean_merge;
 }
 
+/*
+ * Per entry merge function for D/F conflicts, to be called only after
+ * all files below dir have been processed.  We do this because in the
+ * cases we can cleanly resolve D/F conflicts, process_entry() can clean
+ * out all the files below the directory for us.
+ */
+static int process_df_entry(struct merge_options *o,
+                        const char *path, struct stage_data *entry)
+{
+       int clean_merge = 1;
+       unsigned o_mode = entry->stages[1].mode;
+       unsigned a_mode = entry->stages[2].mode;
+       unsigned b_mode = entry->stages[3].mode;
+       unsigned char *o_sha = stage_sha(entry->stages[1].sha, o_mode);
+       unsigned char *a_sha = stage_sha(entry->stages[2].sha, a_mode);
+       unsigned char *b_sha = stage_sha(entry->stages[3].sha, b_mode);
+       const char *add_branch;
+       const char *other_branch;
+       unsigned mode;
+       const unsigned char *sha;
+       const char *conf;
+       struct stat st;
+
+       /* We currently only handle D->F cases */
+       assert((!o_sha && a_sha && !b_sha) ||
+              (!o_sha && !a_sha && b_sha));
+
+       entry->processed = 1;
+
+       if (a_sha) {
+               add_branch = o->branch1;
+               other_branch = o->branch2;
+               mode = a_mode;
+               sha = a_sha;
+               conf = "file/directory";
+       } else {
+               add_branch = o->branch2;
+               other_branch = o->branch1;
+               mode = b_mode;
+               sha = b_sha;
+               conf = "directory/file";
+       }
+       if (lstat(path, &st) == 0 && S_ISDIR(st.st_mode)) {
+               const char *new_path = unique_path(o, path, add_branch);
+               clean_merge = 0;
+               output(o, 1, "CONFLICT (%s): There is a directory with name %s in %s. "
+                      "Adding %s as %s",
+                      conf, path, other_branch, path, new_path);
+               remove_file(o, 0, path, 0);
+               update_file(o, 0, sha, mode, new_path);
+       } else {
+               output(o, 2, "Adding %s", path);
+               update_file(o, 1, sha, mode, path);
+       }
+
+       return clean_merge;
+}
+
 struct unpack_trees_error_msgs get_porcelain_error_msgs(void)
 {
        struct unpack_trees_error_msgs msgs = {
@@ -1261,6 +1303,13 @@ int merge_trees(struct merge_options *o,
                                && !process_entry(o, path, e))
                                clean = 0;
                }
+               for (i = 0; i < entries->nr; i++) {
+                       const char *path = entries->items[i].string;
+                       struct stage_data *e = entries->items[i].util;
+                       if (!e->processed
+                               && !process_df_entry(o, path, e))
+                               clean = 0;
+               }
 
                string_list_clear(re_merge, 0);
                string_list_clear(re_head, 0);
@@ -1359,6 +1408,7 @@ int merge_recursive(struct merge_options *o,
        if (!o->call_depth)
                read_cache();
 
+       o->ancestor = "merged common ancestors";
        clean = merge_trees(o, h1->tree, h2->tree, merged_common_ancestors->tree,
                            &mrtree);