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         struct cache_entry *ce;
  23
  24         if (S_ISDIR(mode))
  25                 return READ_TREE_RECURSIVE;
  26
  27         len = strlen(pathname);
  28         ce = make_empty_cache_entry(istate, baselen + len);
  29
  30         ce->ce_mode = create_ce_mode(mode);
  31         ce->ce_flags = create_ce_flags(stage);
  32         ce->ce_namelen = baselen + len;
  33         memcpy(ce->name, base, baselen);
  34         memcpy(ce->name + baselen, pathname, len+1);
  35         oidcpy(&ce->oid, oid);
  36         return add_index_entry(istate, ce, opt);
  37 }
  38
  39 static int read_one_entry(const struct object_id *oid, struct strbuf *base,
  40                           const char *pathname, unsigned mode, int stage,
  41                           void *context)
  42 {
  43         struct index_state *istate = context;
  44         return read_one_entry_opt(istate, oid, base->buf, base->len, pathname,
  45                                   mode, stage,
  46                                   ADD_CACHE_OK_TO_ADD|ADD_CACHE_SKIP_DFCHECK);
  47 }
  48
  49 /*
  50  * This is used when the caller knows there is no existing entries at
  51  * the stage that will conflict with the entry being added.
  52  */
  53 static int read_one_entry_quick(const struct object_id *oid, struct strbuf *base,
  54                                 const char *pathname, unsigned mode, int stage,
  55                                 void *context)
  56 {
  57         struct index_state *istate = context;
  58         return read_one_entry_opt(istate, oid, base->buf, base->len, pathname,
  59                                   mode, stage,
  60                                   ADD_CACHE_JUST_APPEND);
  61 }
  62
  63 static int read_tree_1(struct repository *r,
  64                        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(r->index, &entry,
  82                                                         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(r, 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(r, lookup_tree(r, &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 repository *r,
 134                         struct tree *tree,
 135                         const char *base, int baselen,
 136                         int stage, const struct pathspec *pathspec,
 137                         read_tree_fn_t fn, void *context)
 138 {
 139         struct strbuf sb = STRBUF_INIT;
 140         int ret;
 141
 142         strbuf_add(&sb, base, baselen);
 143         ret = read_tree_1(r, tree, &sb, stage, pathspec, fn, context);
 144         strbuf_release(&sb);
 145         return ret;
 146 }
 147
 148 static int cmp_cache_name_compare(const void *a_, const void *b_)
 149 {
 150         const struct cache_entry *ce1, *ce2;
 151
 152         ce1 = *((const struct cache_entry **)a_);
 153         ce2 = *((const struct cache_entry **)b_);
 154         return cache_name_stage_compare(ce1->name, ce1->ce_namelen, ce_stage(ce1),
 155                                   ce2->name, ce2->ce_namelen, ce_stage(ce2));
 156 }
 157
 158 int read_tree(struct repository *r, struct tree *tree, int stage,
 159               struct pathspec *match, struct index_state *istate)
 160 {
 161         read_tree_fn_t fn = NULL;
 162         int i, err;
 163
 164         /*
 165          * Currently the only existing callers of this function all
 166          * call it with stage=1 and after making sure there is nothing
 167          * at that stage; we could always use read_one_entry_quick().
 168          *
 169          * But when we decide to straighten out git-read-tree not to
 170          * use unpack_trees() in some cases, this will probably start
 171          * to matter.
 172          */
 173
 174         /*
 175          * See if we have cache entry at the stage.  If so,
 176          * do it the original slow way, otherwise, append and then
 177          * sort at the end.
 178          */
 179         for (i = 0; !fn && i < istate->cache_nr; i++) {
 180                 const struct cache_entry *ce = istate->cache[i];
 181                 if (ce_stage(ce) == stage)
 182                         fn = read_one_entry;
 183         }
 184
 185         if (!fn)
 186                 fn = read_one_entry_quick;
 187         err = read_tree_recursive(r, tree, "", 0, stage, match, fn, istate);
 188         if (fn == read_one_entry || err)
 189                 return err;
 190
 191         /*
 192          * Sort the cache entry -- we need to nuke the cache tree, though.
 193          */
 194         cache_tree_free(&istate->cache_tree);
 195         QSORT(istate->cache, istate->cache_nr, cmp_cache_name_compare);
 196         return 0;
 197 }
 198
 199 struct tree *lookup_tree(struct repository *r, const struct object_id *oid)
 200 {
 201         struct object *obj = lookup_object(r, oid->hash);
 202         if (!obj)
 203                 return create_object(r, oid->hash,
 204                                      alloc_tree_node(r));
 205         return object_as_type(r, obj, OBJ_TREE, 0);
 206 }
 207
 208 int parse_tree_buffer(struct tree *item, void *buffer, unsigned long size)
 209 {
 210         if (item->object.parsed)
 211                 return 0;
 212         item->object.parsed = 1;
 213         item->buffer = buffer;
 214         item->size = size;
 215
 216         return 0;
 217 }
 218
 219 int parse_tree_gently(struct tree *item, int quiet_on_missing)
 220 {
 221          enum object_type type;
 222          void *buffer;
 223          unsigned long size;
 224
 225         if (item->object.parsed)
 226                 return 0;
 227         buffer = read_object_file(&item->object.oid, &type, &size);
 228         if (!buffer)
 229                 return quiet_on_missing ? -1 :
 230                         error("Could not read %s",
 231                              oid_to_hex(&item->object.oid));
 232         if (type != OBJ_TREE) {
 233                 free(buffer);
 234                 return error("Object %s not a tree",
 235                              oid_to_hex(&item->object.oid));
 236         }
 237         return parse_tree_buffer(item, buffer, size);
 238 }
 239
 240 void free_tree_buffer(struct tree *tree)
 241 {
 242         FREE_AND_NULL(tree->buffer);
 243         tree->size = 0;
 244         tree->object.parsed = 0;
 245 }
 246
 247 struct tree *parse_tree_indirect(const struct object_id *oid)
 248 {
 249         struct object *obj = parse_object(the_repository, oid);
 250         do {
 251                 if (!obj)
 252                         return NULL;
 253                 if (obj->type == OBJ_TREE)
 254                         return (struct tree *) obj;
 255                 else if (obj->type == OBJ_COMMIT)
 256                         obj = &(get_commit_tree(((struct commit *)obj))->object);
 257                 else if (obj->type == OBJ_TAG)
 258                         obj = ((struct tag *) obj)->tagged;
 259                 else
 260                         return NULL;
 261                 if (!obj->parsed)
 262                         parse_object(the_repository, &obj->oid);
 263         } while (1);
 264 }