tree.c

   1 #define NO_THE_INDEX_COMPATIBILITY_MACROS
   2 #include "cache.h"
   3 #include "cache-tree.h"
   4 #include "tree.h"
   5 #include "object-store.h"
   6 #include "blob.h"
   7 #include "commit.h"
   8 #include "tag.h"
   9 #include "alloc.h"
  10 #include "tree-walk.h"
  11 #include "repository.h"
  12
  13 const char *tree_type = "tree";
  14
  15 static int read_one_entry_opt(struct index_state *istate,
  16                               const struct object_id *oid,
  17                               const char *base, int baselen,
  18                               const char *pathname,
  19                               unsigned mode, int stage, int opt)
  20 {
  21         int len;
  22         unsigned int size;
  23         struct cache_entry *ce;
  24
  25         if (S_ISDIR(mode))
  26                 return READ_TREE_RECURSIVE;
  27
  28         len = strlen(pathname);
  29         size = cache_entry_size(baselen + len);
  30         ce = xcalloc(1, size);
  31
  32         ce->ce_mode = create_ce_mode(mode);
  33         ce->ce_flags = create_ce_flags(stage);
  34         ce->ce_namelen = baselen + len;
  35         memcpy(ce->name, base, baselen);
  36         memcpy(ce->name + baselen, pathname, len+1);
  37         oidcpy(&ce->oid, oid);
  38         return add_index_entry(istate, ce, opt);
  39 }
  40
  41 static int read_one_entry(const struct object_id *oid, struct strbuf *base,
  42                           const char *pathname, unsigned mode, int stage,
  43                           void *context)
  44 {
  45         struct index_state *istate = context;
  46         return read_one_entry_opt(istate, oid, base->buf, base->len, pathname,
  47                                   mode, stage,
  48                                   ADD_CACHE_OK_TO_ADD|ADD_CACHE_SKIP_DFCHECK);
  49 }
  50
  51 /*
  52  * This is used when the caller knows there is no existing entries at
  53  * the stage that will conflict with the entry being added.
  54  */
  55 static int read_one_entry_quick(const struct object_id *oid, struct strbuf *base,
  56                                 const char *pathname, unsigned mode, int stage,
  57                                 void *context)
  58 {
  59         struct index_state *istate = context;
  60         return read_one_entry_opt(istate, oid, base->buf, base->len, pathname,
  61                                   mode, stage,
  62                                   ADD_CACHE_JUST_APPEND);
  63 }
  64
  65 static int read_tree_1(struct tree *tree, struct strbuf *base,
  66                        int stage, const struct pathspec *pathspec,
  67                        read_tree_fn_t fn, void *context)
  68 {
  69         struct tree_desc desc;
  70         struct name_entry entry;
  71         struct object_id oid;
  72         int len, oldlen = base->len;
  73         enum interesting retval = entry_not_interesting;
  74
  75         if (parse_tree(tree))
  76                 return -1;
  77
  78         init_tree_desc(&desc, tree->buffer, tree->size);
  79
  80         while (tree_entry(&desc, &entry)) {
  81                 if (retval != all_entries_interesting) {
  82                         retval = tree_entry_interesting(&entry, base, 0, pathspec);
  83                         if (retval == all_entries_not_interesting)
  84                                 break;
  85                         if (retval == entry_not_interesting)
  86                                 continue;
  87                 }
  88
  89                 switch (fn(entry.oid, base,
  90                            entry.path, entry.mode, stage, context)) {
  91                 case 0:
  92                         continue;
  93                 case READ_TREE_RECURSIVE:
  94                         break;
  95                 default:
  96                         return -1;
  97                 }
  98
  99                 if (S_ISDIR(entry.mode))
 100                         oidcpy(&oid, entry.oid);
 101                 else if (S_ISGITLINK(entry.mode)) {
 102                         struct commit *commit;
 103
 104                         commit = lookup_commit(the_repository, entry.oid);
 105                         if (!commit)
 106                                 die("Commit %s in submodule path %s%s not found",
 107                                     oid_to_hex(entry.oid),
 108                                     base->buf, entry.path);
 109
 110                         if (parse_commit(commit))
 111                                 die("Invalid commit %s in submodule path %s%s",
 112                                     oid_to_hex(entry.oid),
 113                                     base->buf, entry.path);
 114
 115                         oidcpy(&oid, get_commit_tree_oid(commit));
 116                 }
 117                 else
 118                         continue;
 119
 120                 len = tree_entry_len(&entry);
 121                 strbuf_add(base, entry.path, len);
 122                 strbuf_addch(base, '/');
 123                 retval = read_tree_1(lookup_tree(the_repository, &oid),
 124                                      base, stage, pathspec,
 125                                      fn, context);
 126                 strbuf_setlen(base, oldlen);
 127                 if (retval)
 128                         return -1;
 129         }
 130         return 0;
 131 }
 132
 133 int read_tree_recursive(struct tree *tree,
 134                         const char *base, int baselen,
 135                         int stage, const struct pathspec *pathspec,
 136                         read_tree_fn_t fn, void *context)
 137 {
 138         struct strbuf sb = STRBUF_INIT;
 139         int ret;
 140
 141         strbuf_add(&sb, base, baselen);
 142         ret = read_tree_1(tree, &sb, stage, pathspec, fn, context);
 143         strbuf_release(&sb);
 144         return ret;
 145 }
 146
 147 static int cmp_cache_name_compare(const void *a_, const void *b_)
 148 {
 149         const struct cache_entry *ce1, *ce2;
 150
 151         ce1 = *((const struct cache_entry **)a_);
 152         ce2 = *((const struct cache_entry **)b_);
 153         return cache_name_stage_compare(ce1->name, ce1->ce_namelen, ce_stage(ce1),
 154                                   ce2->name, ce2->ce_namelen, ce_stage(ce2));
 155 }
 156
 157 int read_tree(struct tree *tree, int stage, struct pathspec *match,
 158               struct index_state *istate)
 159 {
 160         read_tree_fn_t fn = NULL;
 161         int i, err;
 162
 163         /*
 164          * Currently the only existing callers of this function all
 165          * call it with stage=1 and after making sure there is nothing
 166          * at that stage; we could always use read_one_entry_quick().
 167          *
 168          * But when we decide to straighten out git-read-tree not to
 169          * use unpack_trees() in some cases, this will probably start
 170          * to matter.
 171          */
 172
 173         /*
 174          * See if we have cache entry at the stage.  If so,
 175          * do it the original slow way, otherwise, append and then
 176          * sort at the end.
 177          */
 178         for (i = 0; !fn && i < istate->cache_nr; i++) {
 179                 const struct cache_entry *ce = istate->cache[i];
 180                 if (ce_stage(ce) == stage)
 181                         fn = read_one_entry;
 182         }
 183
 184         if (!fn)
 185                 fn = read_one_entry_quick;
 186         err = read_tree_recursive(tree, "", 0, stage, match, fn, istate);
 187         if (fn == read_one_entry || err)
 188                 return err;
 189
 190         /*
 191          * Sort the cache entry -- we need to nuke the cache tree, though.
 192          */
 193         cache_tree_free(&istate->cache_tree);
 194         QSORT(istate->cache, istate->cache_nr, cmp_cache_name_compare);
 195         return 0;
 196 }
 197
 198 struct tree *lookup_tree(struct repository *r, const struct object_id *oid)
 199 {
 200         struct object *obj = lookup_object(r, oid->hash);
 201         if (!obj)
 202                 return create_object(r, oid->hash,
 203                                      alloc_tree_node(r));
 204         return object_as_type(r, obj, OBJ_TREE, 0);
 205 }
 206
 207 int parse_tree_buffer(struct tree *item, void *buffer, unsigned long size)
 208 {
 209         if (item->object.parsed)
 210                 return 0;
 211         item->object.parsed = 1;
 212         item->buffer = buffer;
 213         item->size = size;
 214
 215         return 0;
 216 }
 217
 218 int parse_tree_gently(struct tree *item, int quiet_on_missing)
 219 {
 220          enum object_type type;
 221          void *buffer;
 222          unsigned long size;
 223
 224         if (item->object.parsed)
 225                 return 0;
 226         buffer = read_object_file(&item->object.oid, &type, &size);
 227         if (!buffer)
 228                 return quiet_on_missing ? -1 :
 229                         error("Could not read %s",
 230                              oid_to_hex(&item->object.oid));
 231         if (type != OBJ_TREE) {
 232                 free(buffer);
 233                 return error("Object %s not a tree",
 234                              oid_to_hex(&item->object.oid));
 235         }
 236         return parse_tree_buffer(item, buffer, size);
 237 }
 238
 239 void free_tree_buffer(struct tree *tree)
 240 {
 241         FREE_AND_NULL(tree->buffer);
 242         tree->size = 0;
 243         tree->object.parsed = 0;
 244 }
 245
 246 struct tree *parse_tree_indirect(const struct object_id *oid)
 247 {
 248         struct object *obj = parse_object(the_repository, oid);
 249         do {
 250                 if (!obj)
 251                         return NULL;
 252                 if (obj->type == OBJ_TREE)
 253                         return (struct tree *) obj;
 254                 else if (obj->type == OBJ_COMMIT)
 255                         obj = &(get_commit_tree(((struct commit *)obj))->object);
 256                 else if (obj->type == OBJ_TAG)
 257                         obj = ((struct tag *) obj)->tagged;
 258                 else
 259                         return NULL;
 260                 if (!obj->parsed)
 261                         parse_object(the_repository, &obj->oid);
 262         } while (1);
 263 }