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