merge-recursive: handle return values indicating errors
[gitweb.git] / merge-recursive.c
index 1f86338ad3f16c233e9fe589a8c3210e0464c8b0..6beb1e49168f09d06523c3b257b47adf74c58251 100644 (file)
@@ -742,12 +742,12 @@ static int make_room_for_path(struct merge_options *o, const char *path)
        return error(msg, path, _(": perhaps a D/F conflict?"));
 }
 
-static void update_file_flags(struct merge_options *o,
-                             const struct object_id *oid,
-                             unsigned mode,
-                             const char *path,
-                             int update_cache,
-                             int update_wd)
+static int update_file_flags(struct merge_options *o,
+                            const struct object_id *oid,
+                            unsigned mode,
+                            const char *path,
+                            int update_cache,
+                            int update_wd)
 {
        if (o->call_depth)
                update_wd = 0;
@@ -783,8 +783,7 @@ static void update_file_flags(struct merge_options *o,
 
                if (make_room_for_path(o, path) < 0) {
                        update_wd = 0;
-                       free(buf);
-                       goto update_index;
+                       goto free_buf;
                }
                if (S_ISREG(mode) || (!has_symlinks && S_ISLNK(mode))) {
                        int fd;
@@ -807,20 +806,22 @@ static void update_file_flags(struct merge_options *o,
                } else
                        die(_("do not know what to do with %06o %s '%s'"),
                            mode, oid_to_hex(oid), path);
+ free_buf:
                free(buf);
        }
  update_index:
        if (update_cache)
                add_cacheinfo(mode, oid, path, 0, update_wd, ADD_CACHE_OK_TO_ADD);
+       return 0;
 }
 
-static void update_file(struct merge_options *o,
-                       int clean,
-                       const struct object_id *oid,
-                       unsigned mode,
-                       const char *path)
+static int update_file(struct merge_options *o,
+                      int clean,
+                      const struct object_id *oid,
+                      unsigned mode,
+                      const char *path)
 {
-       update_file_flags(o, oid, mode, path, o->call_depth || clean, !o->call_depth);
+       return update_file_flags(o, oid, mode, path, o->call_depth || clean, !o->call_depth);
 }
 
 /* Low level file merging, update and removal */
@@ -1019,7 +1020,7 @@ static int merge_file_one(struct merge_options *o,
        return merge_file_1(o, &one, &a, &b, branch1, branch2, mfi);
 }
 
-static void handle_change_delete(struct merge_options *o,
+static int handle_change_delete(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,
@@ -1027,6 +1028,7 @@ static void handle_change_delete(struct merge_options *o,
                                 const char *change, const char *change_past)
 {
        char *renamed = NULL;
+       int ret = 0;
        if (dir_in_way(path, !o->call_depth)) {
                renamed = unique_path(o, path, a_oid ? o->branch1 : o->branch2);
        }
@@ -1037,21 +1039,23 @@ static void handle_change_delete(struct merge_options *o,
                 * correct; since there is no true "middle point" between
                 * them, simply reuse the base version for virtual merge base.
                 */
-               remove_file_from_cache(path);
-               update_file(o, 0, o_oid, o_mode, renamed ? renamed : path);
+               ret = remove_file_from_cache(path);
+               if (!ret)
+                       ret = update_file(o, 0, o_oid, o_mode,
+                                         renamed ? renamed : path);
        } else if (!a_oid) {
                if (!renamed) {
                        output(o, 1, _("CONFLICT (%s/delete): %s deleted in %s "
                               "and %s in %s. Version %s of %s left in tree."),
                               change, path, o->branch1, change_past,
                               o->branch2, o->branch2, path);
-                       update_file(o, 0, b_oid, b_mode, path);
+                       ret = update_file(o, 0, b_oid, b_mode, path);
                } else {
                        output(o, 1, _("CONFLICT (%s/delete): %s deleted in %s "
                               "and %s in %s. Version %s of %s left in tree at %s."),
                               change, path, o->branch1, change_past,
                               o->branch2, o->branch2, path, renamed);
-                       update_file(o, 0, b_oid, b_mode, renamed);
+                       ret = update_file(o, 0, b_oid, b_mode, renamed);
                }
        } else {
                if (!renamed) {
@@ -1064,7 +1068,7 @@ static void handle_change_delete(struct merge_options *o,
                               "and %s in %s. Version %s of %s left in tree at %s."),
                               change, path, o->branch2, change_past,
                               o->branch1, o->branch1, path, renamed);
-                       update_file(o, 0, a_oid, a_mode, renamed);
+                       ret = update_file(o, 0, a_oid, a_mode, renamed);
                }
                /*
                 * No need to call update_file() on path when !renamed, since
@@ -1074,9 +1078,11 @@ static void handle_change_delete(struct merge_options *o,
                 */
        }
        free(renamed);
+
+       return ret;
 }
 
-static void conflict_rename_delete(struct merge_options *o,
+static int conflict_rename_delete(struct merge_options *o,
                                   struct diff_filepair *pair,
                                   const char *rename_branch,
                                   const char *other_branch)
@@ -1096,21 +1102,20 @@ static void conflict_rename_delete(struct merge_options *o,
                b_mode = dest->mode;
        }
 
-       handle_change_delete(o,
-                            o->call_depth ? orig->path : dest->path,
-                            &orig->oid, orig->mode,
-                            a_oid, a_mode,
-                            b_oid, b_mode,
-                            _("rename"), _("renamed"));
-
-       if (o->call_depth) {
-               remove_file_from_cache(dest->path);
-       } else {
-               update_stages(dest->path, NULL,
-                             rename_branch == o->branch1 ? dest : NULL,
-                             rename_branch == o->branch1 ? NULL : dest);
-       }
+       if (handle_change_delete(o,
+                                o->call_depth ? orig->path : dest->path,
+                                &orig->oid, orig->mode,
+                                a_oid, a_mode,
+                                b_oid, b_mode,
+                                _("rename"), _("renamed")))
+               return -1;
 
+       if (o->call_depth)
+               return remove_file_from_cache(dest->path);
+       else
+               return update_stages(dest->path, NULL,
+                                    rename_branch == o->branch1 ? dest : NULL,
+                                    rename_branch == o->branch1 ? NULL : dest);
 }
 
 static struct diff_filespec *filespec_from_entry(struct diff_filespec *target,
@@ -1126,7 +1131,7 @@ static struct diff_filespec *filespec_from_entry(struct diff_filespec *target,
        return target;
 }
 
-static void handle_file(struct merge_options *o,
+static int handle_file(struct merge_options *o,
                        struct diff_filespec *rename,
                        int stage,
                        struct rename_conflict_info *ci)
@@ -1136,6 +1141,7 @@ static void handle_file(struct merge_options *o,
        const char *cur_branch, *other_branch;
        struct diff_filespec other;
        struct diff_filespec *add;
+       int ret;
 
        if (stage == 2) {
                dst_entry = ci->dst_entry1;
@@ -1150,7 +1156,8 @@ static void handle_file(struct merge_options *o,
        add = filespec_from_entry(&other, dst_entry, stage ^ 1);
        if (add) {
                char *add_name = unique_path(o, rename->path, other_branch);
-               update_file(o, 0, &add->oid, add->mode, add_name);
+               if (update_file(o, 0, &add->oid, add->mode, add_name))
+                       return -1;
 
                remove_file(o, 0, rename->path, 0);
                dst_name = unique_path(o, rename->path, cur_branch);
@@ -1161,17 +1168,20 @@ static void handle_file(struct merge_options *o,
                               rename->path, other_branch, dst_name);
                }
        }
-       update_file(o, 0, &rename->oid, rename->mode, dst_name);
-       if (stage == 2)
-               update_stages(rename->path, NULL, rename, add);
+       if ((ret = update_file(o, 0, &rename->oid, rename->mode, dst_name)))
+               ; /* fall through, do allow dst_name to be released */
+       else if (stage == 2)
+               ret = update_stages(rename->path, NULL, rename, add);
        else
-               update_stages(rename->path, NULL, add, rename);
+               ret = update_stages(rename->path, NULL, add, rename);
 
        if (dst_name != rename->path)
                free(dst_name);
+
+       return ret;
 }
 
-static void conflict_rename_rename_1to2(struct merge_options *o,
+static int conflict_rename_rename_1to2(struct merge_options *o,
                                        struct rename_conflict_info *ci)
 {
        /* One file was renamed in both branches, but to different names. */
@@ -1194,14 +1204,16 @@ static void conflict_rename_rename_1to2(struct merge_options *o,
                                 &a->oid, a->mode,
                                 &b->oid, b->mode,
                                 ci->branch1, ci->branch2, &mfi))
-                       return;
+                       return -1;
+
                /*
                 * FIXME: For rename/add-source conflicts (if we could detect
                 * such), this is wrong.  We should instead find a unique
                 * pathname and then either rename the add-source file to that
                 * unique path, or use that unique path instead of src here.
                 */
-               update_file(o, 0, &mfi.oid, mfi.mode, one->path);
+               if (update_file(o, 0, &mfi.oid, mfi.mode, one->path))
+                       return -1;
 
                /*
                 * Above, we put the merged content at the merge-base's
@@ -1212,22 +1224,26 @@ static void conflict_rename_rename_1to2(struct merge_options *o,
                 * resolving the conflict at that path in its favor.
                 */
                add = filespec_from_entry(&other, ci->dst_entry1, 2 ^ 1);
-               if (add)
-                       update_file(o, 0, &add->oid, add->mode, a->path);
+               if (add) {
+                       if (update_file(o, 0, &add->oid, add->mode, a->path))
+                               return -1;
+               }
                else
                        remove_file_from_cache(a->path);
                add = filespec_from_entry(&other, ci->dst_entry2, 3 ^ 1);
-               if (add)
-                       update_file(o, 0, &add->oid, add->mode, b->path);
+               if (add) {
+                       if (update_file(o, 0, &add->oid, add->mode, b->path))
+                               return -1;
+               }
                else
                        remove_file_from_cache(b->path);
-       } else {
-               handle_file(o, a, 2, ci);
-               handle_file(o, b, 3, ci);
-       }
+       } else if (handle_file(o, a, 2, ci) || handle_file(o, b, 3, ci))
+               return -1;
+
+       return 0;
 }
 
-static void conflict_rename_rename_2to1(struct merge_options *o,
+static int conflict_rename_rename_2to1(struct merge_options *o,
                                        struct rename_conflict_info *ci)
 {
        /* Two files, a & b, were renamed to the same thing, c. */
@@ -1238,6 +1254,7 @@ static void conflict_rename_rename_2to1(struct merge_options *o,
        char *path = c1->path; /* == c2->path */
        struct merge_file_info mfi_c1;
        struct merge_file_info mfi_c2;
+       int ret;
 
        output(o, 1, _("CONFLICT (rename/rename): "
               "Rename %s->%s in %s. "
@@ -1254,7 +1271,7 @@ static void conflict_rename_rename_2to1(struct merge_options *o,
            merge_file_special_markers(o, b, &ci->ren2_other, c2,
                                       o->branch1, ci->ren2_other.path,
                                       o->branch2, c2->path, &mfi_c2))
-               return;
+               return -1;
 
        if (o->call_depth) {
                /*
@@ -1265,19 +1282,25 @@ static void conflict_rename_rename_2to1(struct merge_options *o,
                 * again later for the non-recursive merge.
                 */
                remove_file(o, 0, path, 0);
-               update_file(o, 0, &mfi_c1.oid, mfi_c1.mode, a->path);
-               update_file(o, 0, &mfi_c2.oid, mfi_c2.mode, b->path);
+               ret = update_file(o, 0, &mfi_c1.oid, mfi_c1.mode, a->path);
+               if (!ret)
+                       ret = update_file(o, 0, &mfi_c2.oid, mfi_c2.mode,
+                                         b->path);
        } else {
                char *new_path1 = unique_path(o, path, ci->branch1);
                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);
-               update_file(o, 0, &mfi_c1.oid, mfi_c1.mode, new_path1);
-               update_file(o, 0, &mfi_c2.oid, mfi_c2.mode, new_path2);
+               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);
                free(new_path2);
                free(new_path1);
        }
+
+       return ret;
 }
 
 static int process_renames(struct merge_options *o,
@@ -1462,12 +1485,13 @@ static int process_renames(struct merge_options *o,
                                 * update_file_flags() instead of
                                 * update_file().
                                 */
-                               update_file_flags(o,
-                                                 &ren1->pair->two->oid,
-                                                 ren1->pair->two->mode,
-                                                 ren1_dst,
-                                                 1, /* update_cache */
-                                                 0  /* update_wd    */);
+                               if (update_file_flags(o,
+                                                     &ren1->pair->two->oid,
+                                                     ren1->pair->two->mode,
+                                                     ren1_dst,
+                                                     1, /* update_cache */
+                                                     0  /* update_wd    */))
+                                       clean_merge = -1;
                        } else if (!oid_eq(&dst_other.oid, &null_oid)) {
                                clean_merge = 0;
                                try_merge = 1;
@@ -1482,22 +1506,28 @@ static int process_renames(struct merge_options *o,
                                                           ren1->pair->two->mode,
                                                           &dst_other.oid,
                                                           dst_other.mode,
-                                                          branch1, branch2, &mfi))
-                                               return -1;
+                                                          branch1, branch2, &mfi)) {
+                                               clean_merge = -1;
+                                               goto cleanup_and_return;
+                                       }
                                        output(o, 1, _("Adding merged %s"), ren1_dst);
-                                       update_file(o, 0, &mfi.oid,
-                                                   mfi.mode, ren1_dst);
+                                       if (update_file(o, 0, &mfi.oid,
+                                                       mfi.mode, ren1_dst))
+                                               clean_merge = -1;
                                        try_merge = 0;
                                } else {
                                        char *new_path = unique_path(o, ren1_dst, branch2);
                                        output(o, 1, _("Adding as %s instead"), new_path);
-                                       update_file(o, 0, &dst_other.oid,
-                                                   dst_other.mode, new_path);
+                                       if (update_file(o, 0, &dst_other.oid,
+                                                       dst_other.mode, new_path))
+                                               clean_merge = -1;
                                        free(new_path);
                                }
                        } else
                                try_merge = 1;
 
+                       if (clean_merge < 0)
+                               goto cleanup_and_return;
                        if (try_merge) {
                                struct diff_filespec *one, *a, *b;
                                src_other.path = (char *)ren1_src;
@@ -1524,6 +1554,7 @@ static int process_renames(struct merge_options *o,
                        }
                }
        }
+cleanup_and_return:
        string_list_clear(&a_by_dst, 0);
        string_list_clear(&b_by_dst, 0);
 
@@ -1586,18 +1617,18 @@ static int blob_unchanged(const struct object_id *o_oid,
        return ret;
 }
 
-static void handle_modify_delete(struct merge_options *o,
+static int handle_modify_delete(struct merge_options *o,
                                 const char *path,
                                 struct object_id *o_oid, int o_mode,
                                 struct object_id *a_oid, int a_mode,
                                 struct object_id *b_oid, int b_mode)
 {
-       handle_change_delete(o,
-                            path,
-                            o_oid, o_mode,
-                            a_oid, a_mode,
-                            b_oid, b_mode,
-                            _("modify"), _("modified"));
+       return handle_change_delete(o,
+                                   path,
+                                   o_oid, o_mode,
+                                   a_oid, a_mode,
+                                   b_oid, b_mode,
+                                   _("modify"), _("modified"));
 }
 
 static int merge_content(struct merge_options *o,
@@ -1671,7 +1702,8 @@ static int merge_content(struct merge_options *o,
                output(o, 1, _("CONFLICT (%s): Merge conflict in %s"),
                                reason, path);
                if (rename_conflict_info && !df_conflict_remains)
-                       update_stages(path, &one, &a, &b);
+                       if (update_stages(path, &one, &a, &b))
+                               return -1;
        }
 
        if (df_conflict_remains) {
@@ -1679,30 +1711,33 @@ static int merge_content(struct merge_options *o,
                if (o->call_depth) {
                        remove_file_from_cache(path);
                } else {
-                       if (!mfi.clean)
-                               update_stages(path, &one, &a, &b);
-                       else {
+                       if (!mfi.clean) {
+                               if (update_stages(path, &one, &a, &b))
+                                       return -1;
+                       } else {
                                int file_from_stage2 = was_tracked(path);
                                struct diff_filespec merged;
                                oidcpy(&merged.oid, &mfi.oid);
                                merged.mode = mfi.mode;
 
-                               update_stages(path, NULL,
-                                             file_from_stage2 ? &merged : NULL,
-                                             file_from_stage2 ? NULL : &merged);
+                               if (update_stages(path, NULL,
+                                                 file_from_stage2 ? &merged : NULL,
+                                                 file_from_stage2 ? NULL : &merged))
+                                       return -1;
                        }
 
                }
                new_path = unique_path(o, path, rename_conflict_info->branch1);
                output(o, 1, _("Adding as %s instead"), new_path);
-               update_file(o, 0, &mfi.oid, mfi.mode, new_path);
+               if (update_file(o, 0, &mfi.oid, mfi.mode, new_path)) {
+                       free(new_path);
+                       return -1;
+               }
                free(new_path);
                mfi.clean = 0;
-       } else {
-               update_file(o, mfi.clean, &mfi.oid, mfi.mode, path);
-       }
+       } else if (update_file(o, mfi.clean, &mfi.oid, mfi.mode, path))
+               return -1;
        return mfi.clean;
-
 }
 
 /* Per entry merge function */
@@ -1730,17 +1765,21 @@ static int process_entry(struct merge_options *o,
                        break;
                case RENAME_DELETE:
                        clean_merge = 0;
-                       conflict_rename_delete(o, conflict_info->pair1,
-                                              conflict_info->branch1,
-                                              conflict_info->branch2);
+                       if (conflict_rename_delete(o,
+                                                  conflict_info->pair1,
+                                                  conflict_info->branch1,
+                                                  conflict_info->branch2))
+                               clean_merge = -1;
                        break;
                case RENAME_ONE_FILE_TO_TWO:
                        clean_merge = 0;
-                       conflict_rename_rename_1to2(o, conflict_info);
+                       if (conflict_rename_rename_1to2(o, conflict_info))
+                               clean_merge = -1;
                        break;
                case RENAME_TWO_FILES_TO_ONE:
                        clean_merge = 0;
-                       conflict_rename_rename_2to1(o, conflict_info);
+                       if (conflict_rename_rename_2to1(o, conflict_info))
+                               clean_merge = -1;
                        break;
                default:
                        entry->processed = 0;
@@ -1760,8 +1799,9 @@ static int process_entry(struct merge_options *o,
                } else {
                        /* Modify/delete; deleted side may have put a directory in the way */
                        clean_merge = 0;
-                       handle_modify_delete(o, path, o_oid, o_mode,
-                                            a_oid, a_mode, b_oid, b_mode);
+                       if (handle_modify_delete(o, path, o_oid, o_mode,
+                                                a_oid, a_mode, b_oid, b_mode))
+                               clean_merge = -1;
                }
        } else if ((!o_oid && a_oid && !b_oid) ||
                   (!o_oid && !a_oid && b_oid)) {
@@ -1793,14 +1833,16 @@ static int process_entry(struct merge_options *o,
                        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);
-                       update_file(o, 0, oid, mode, new_path);
-                       if (o->call_depth)
+                       if (update_file(o, 0, oid, mode, new_path))
+                               clean_merge = -1;
+                       else if (o->call_depth)
                                remove_file_from_cache(path);
                        free(new_path);
                } else {
                        output(o, 2, _("Adding %s"), path);
                        /* do not overwrite file if already present */
-                       update_file_flags(o, oid, mode, path, 1, !a_oid);
+                       if (update_file_flags(o, oid, mode, path, 1, !a_oid))
+                               clean_merge = -1;
                }
        } else if (a_oid && b_oid) {
                /* Case C: Added in both (check for same permissions) and */
@@ -1863,12 +1905,18 @@ int merge_trees(struct merge_options *o,
                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);
+               if (clean < 0)
+                       return clean;
                for (i = entries->nr-1; 0 <= i; i--) {
                        const char *path = entries->items[i].string;
                        struct stage_data *e = entries->items[i].util;
-                       if (!e->processed
-                               && !process_entry(o, path, e))
-                               clean = 0;
+                       if (!e->processed) {
+                               int ret = process_entry(o, path, e);
+                               if (!ret)
+                                       clean = 0;
+                               else if (ret < 0)
+                                       return ret;
+                       }
                }
                for (i = 0; i < entries->nr; i++) {
                        struct stage_data *e = entries->items[i].util;