Merge branch 'jc/merge-symlink-ours-theirs' into maint
authorJunio C Hamano <gitster@pobox.com>
Thu, 15 Feb 2018 23:18:12 +0000 (15:18 -0800)
committerJunio C Hamano <gitster@pobox.com>
Thu, 15 Feb 2018 23:18:12 +0000 (15:18 -0800)
"git merge -Xours/-Xtheirs" learned to use our/their version when
resolving a conflicting updates to a symbolic link.

* jc/merge-symlink-ours-theirs:
merge: teach -Xours/-Xtheirs to symbolic link merge

1  2 
merge-recursive.c
diff --combined merge-recursive.c
index 0fc580d8ca97c77d436f3351993300d19acd1ccc,ed529f2ceb6fc1064f18f218962232215e0c02af..cc5fa0a94965fad8821cdf81dfe84737f4dee043
  #include "dir.h"
  #include "submodule.h"
  
 +struct path_hashmap_entry {
 +      struct hashmap_entry e;
 +      char path[FLEX_ARRAY];
 +};
 +
 +static int path_hashmap_cmp(const void *cmp_data,
 +                          const void *entry,
 +                          const void *entry_or_key,
 +                          const void *keydata)
 +{
 +      const struct path_hashmap_entry *a = entry;
 +      const struct path_hashmap_entry *b = entry_or_key;
 +      const char *key = keydata;
 +
 +      if (ignore_case)
 +              return strcasecmp(a->path, key ? key : b->path);
 +      else
 +              return strcmp(a->path, key ? key : b->path);
 +}
 +
 +static unsigned int path_hash(const char *path)
 +{
 +      return ignore_case ? strihash(path) : strhash(path);
 +}
 +
  static void flush_output(struct merge_options *o)
  {
        if (o->buffer_output < 2 && o->obuf.len) {
@@@ -339,25 -314,29 +339,25 @@@ static int save_files_dirs(const unsign
                struct strbuf *base, const char *path,
                unsigned int mode, int stage, void *context)
  {
 +      struct path_hashmap_entry *entry;
        int baselen = base->len;
        struct merge_options *o = context;
  
        strbuf_addstr(base, path);
  
 -      if (S_ISDIR(mode))
 -              string_list_insert(&o->current_directory_set, base->buf);
 -      else
 -              string_list_insert(&o->current_file_set, base->buf);
 +      FLEX_ALLOC_MEM(entry, path, base->buf, base->len);
 +      hashmap_entry_init(entry, path_hash(entry->path));
 +      hashmap_add(&o->current_file_dir_set, entry);
  
        strbuf_setlen(base, baselen);
        return (S_ISDIR(mode) ? READ_TREE_RECURSIVE : 0);
  }
  
 -static int get_files_dirs(struct merge_options *o, struct tree *tree)
 +static void get_files_dirs(struct merge_options *o, struct tree *tree)
  {
 -      int n;
        struct pathspec match_all;
        memset(&match_all, 0, sizeof(match_all));
 -      if (read_tree_recursive(tree, "", 0, 0, &match_all, save_files_dirs, o))
 -              return 0;
 -      n = o->current_file_set.nr + o->current_directory_set.nr;
 -      return n;
 +      read_tree_recursive(tree, "", 0, 0, &match_all, save_files_dirs, o);
  }
  
  /*
@@@ -540,8 -519,8 +540,8 @@@ static struct string_list *get_renames(
                return renames;
  
        diff_setup(&opts);
 -      DIFF_OPT_SET(&opts, RECURSIVE);
 -      DIFF_OPT_CLR(&opts, RENAME_EMPTY);
 +      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 :
@@@ -646,7 -625,7 +646,7 @@@ static int remove_file(struct merge_opt
                if (ignore_case) {
                        struct cache_entry *ce;
                        ce = cache_file_exists(path, strlen(path), ignore_case);
 -                      if (ce && ce_stage(ce) == 0)
 +                      if (ce && ce_stage(ce) == 0 && strcmp(path, ce->name))
                                return 0;
                }
                if (remove_path(path))
@@@ -667,7 -646,6 +667,7 @@@ static void add_flattened_path(struct s
  
  static char *unique_path(struct merge_options *o, const char *path, const char *branch)
  {
 +      struct path_hashmap_entry *entry;
        struct strbuf newpath = STRBUF_INIT;
        int suffix = 0;
        size_t base_len;
        add_flattened_path(&newpath, branch);
  
        base_len = newpath.len;
 -      while (string_list_has_string(&o->current_file_set, newpath.buf) ||
 -             string_list_has_string(&o->current_directory_set, newpath.buf) ||
 +      while (hashmap_get_from_hash(&o->current_file_dir_set,
 +                                   path_hash(newpath.buf), newpath.buf) ||
               (!o->call_depth && file_exists(newpath.buf))) {
                strbuf_setlen(&newpath, base_len);
                strbuf_addf(&newpath, "_%d", suffix++);
        }
  
 -      string_list_insert(&o->current_file_set, newpath.buf);
 +      FLEX_ALLOC_MEM(entry, path, newpath.buf, newpath.len);
 +      hashmap_entry_init(entry, path_hash(entry->path));
 +      hashmap_add(&o->current_file_dir_set, entry);
        return strbuf_detach(&newpath, NULL);
  }
  
@@@ -1026,10 -1002,19 +1026,19 @@@ static int merge_file_1(struct merge_op
                                                       &b->oid,
                                                       !o->call_depth);
                } else if (S_ISLNK(a->mode)) {
-                       oidcpy(&result->oid, &a->oid);
-                       if (!oid_eq(&a->oid, &b->oid))
-                               result->clean = 0;
+                       switch (o->recursive_variant) {
+                       case MERGE_RECURSIVE_NORMAL:
+                               oidcpy(&result->oid, &a->oid);
+                               if (!oid_eq(&a->oid, &b->oid))
+                                       result->clean = 0;
+                               break;
+                       case MERGE_RECURSIVE_OURS:
+                               oidcpy(&result->oid, &a->oid);
+                               break;
+                       case MERGE_RECURSIVE_THEIRS:
+                               oidcpy(&result->oid, &b->oid);
+                               break;
+                       }
                } else
                        die("BUG: unsupported object type in the tree");
        }
@@@ -1901,9 -1886,8 +1910,9 @@@ static int process_entry(struct merge_o
                        oid = b_oid;
                        conf = _("directory/file");
                }
 -              if (dir_in_way(path, !o->call_depth,
 -                             S_ISGITLINK(a_mode))) {
 +              if (dir_in_way(path,
 +                             !o->call_depth && !S_ISGITLINK(a_mode),
 +                             0)) {
                        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. "
@@@ -1952,14 -1936,7 +1961,14 @@@ int merge_trees(struct merge_options *o
        }
  
        if (oid_eq(&common->object.oid, &merge->object.oid)) {
 -              output(o, 0, _("Already up-to-date!"));
 +              struct strbuf sb = STRBUF_INIT;
 +
 +              if (!o->call_depth && index_has_changes(&sb)) {
 +                      err(o, _("Dirty index: cannot merge (dirty: %s)"),
 +                          sb.buf);
 +                      return 0;
 +              }
 +              output(o, 0, _("Already up to date!"));
                *result = head;
                return 1;
        }
        if (unmerged_cache()) {
                struct string_list *entries, *re_head, *re_merge;
                int i;
 -              string_list_clear(&o->current_file_set, 1);
 -              string_list_clear(&o->current_directory_set, 1);
 +              /*
 +               * Only need the hashmap while processing entries, so
 +               * initialize it here and free it when we are done running
 +               * through the entries. Keeping it in the merge_options as
 +               * opposed to decaring a local hashmap is for convenience
 +               * so that we don't have to pass it to around.
 +               */
 +              hashmap_init(&o->current_file_dir_set, path_hashmap_cmp, NULL, 512);
                get_files_dirs(o, head);
                get_files_dirs(o, merge);
  
                re_merge = get_renames(o, merge, common, head, merge, entries);
                clean = process_renames(o, re_head, re_merge);
                if (clean < 0)
 -                      return clean;
 +                      goto cleanup;
                for (i = entries->nr-1; 0 <= i; i--) {
                        const char *path = entries->items[i].string;
                        struct stage_data *e = entries->items[i].util;
                                int ret = process_entry(o, path, e);
                                if (!ret)
                                        clean = 0;
 -                              else if (ret < 0)
 -                                      return ret;
 +                              else if (ret < 0) {
 +                                      clean = ret;
 +                                      goto cleanup;
 +                              }
                        }
                }
                for (i = 0; i < entries->nr; i++) {
                                    entries->items[i].string);
                }
  
 +cleanup:
                string_list_clear(re_merge, 0);
                string_list_clear(re_head, 0);
                string_list_clear(entries, 1);
  
 +              hashmap_free(&o->current_file_dir_set, 1);
 +
                free(re_merge);
                free(re_head);
                free(entries);
 +
 +              if (clean < 0)
 +                      return clean;
        }
        else
                clean = 1;
@@@ -2089,7 -2052,7 +2098,7 @@@ int merge_recursive(struct merge_option
                /* if there is no common ancestor, use an empty tree */
                struct tree *tree;
  
 -              tree = lookup_tree(&empty_tree_oid);
 +              tree = lookup_tree(the_hash_algo->empty_tree);
                merged_common_ancestors = make_virtual_commit(tree, "ancestor");
        }
  
@@@ -2170,7 -2133,7 +2179,7 @@@ int merge_recursive_generic(struct merg
                            struct commit **result)
  {
        int clean;
 -      struct lock_file *lock = xcalloc(1, sizeof(struct lock_file));
 +      struct lock_file lock = LOCK_INIT;
        struct commit *head_commit = get_ref(head, o->branch1);
        struct commit *next_commit = get_ref(merge, o->branch2);
        struct commit_list *ca = NULL;
                }
        }
  
 -      hold_locked_index(lock, LOCK_DIE_ON_ERROR);
 +      hold_locked_index(&lock, LOCK_DIE_ON_ERROR);
        clean = merge_recursive(o, head_commit, next_commit, ca,
                        result);
        if (clean < 0)
                return clean;
  
        if (active_cache_changed &&
 -          write_locked_index(&the_index, lock, COMMIT_LOCK))
 +          write_locked_index(&the_index, &lock, COMMIT_LOCK))
                return err(o, _("Unable to write index."));
  
        return clean ? 0 : 1;
@@@ -2209,7 -2172,6 +2218,7 @@@ static void merge_recursive_config(stru
  
  void init_merge_options(struct merge_options *o)
  {
 +      const char *merge_verbosity;
        memset(o, 0, sizeof(struct merge_options));
        o->verbosity = 2;
        o->buffer_output = 1;
        o->renormalize = 0;
        o->detect_rename = 1;
        merge_recursive_config(o);
 -      if (getenv("GIT_MERGE_VERBOSITY"))
 -              o->verbosity =
 -                      strtol(getenv("GIT_MERGE_VERBOSITY"), NULL, 10);
 +      merge_verbosity = getenv("GIT_MERGE_VERBOSITY");
 +      if (merge_verbosity)
 +              o->verbosity = strtol(merge_verbosity, NULL, 10);
        if (o->verbosity >= 5)
                o->buffer_output = 0;
        strbuf_init(&o->obuf, 0);
 -      string_list_init(&o->current_file_set, 1);
 -      string_list_init(&o->current_directory_set, 1);
        string_list_init(&o->df_conflict_file_set, 1);
  }
  
@@@ -2260,8 -2224,6 +2269,8 @@@ int parse_merge_opt(struct merge_option
                DIFF_XDL_SET(o, IGNORE_WHITESPACE);
        else if (!strcmp(s, "ignore-space-at-eol"))
                DIFF_XDL_SET(o, IGNORE_WHITESPACE_AT_EOL);
 +      else if (!strcmp(s, "ignore-cr-at-eol"))
 +              DIFF_XDL_SET(o, IGNORE_CR_AT_EOL);
        else if (!strcmp(s, "renormalize"))
                o->renormalize = 1;
        else if (!strcmp(s, "no-renormalize"))