tree.c

   1 #include "cache.h"
   2 #include "tree.h"
   3 #include "blob.h"
   4 #include "commit.h"
   5 #include "tag.h"
   6 #include "tree-walk.h"
   7
   8 const char *tree_type = "tree";
   9
  10 static int read_one_entry(const unsigned char *sha1, const char *base, int baselen, const char *pathname, unsigned mode, int stage)
  11 {
  12         int len;
  13         unsigned int size;
  14         struct cache_entry *ce;
  15
  16         if (S_ISDIR(mode))
  17                 return READ_TREE_RECURSIVE;
  18
  19         len = strlen(pathname);
  20         size = cache_entry_size(baselen + len);
  21         ce = xcalloc(1, size);
  22
  23         ce->ce_mode = create_ce_mode(mode);
  24         ce->ce_flags = create_ce_flags(baselen + len, stage);
  25         memcpy(ce->name, base, baselen);
  26         memcpy(ce->name + baselen, pathname, len+1);
  27         hashcpy(ce->sha1, sha1);
  28         return add_cache_entry(ce, ADD_CACHE_OK_TO_ADD|ADD_CACHE_SKIP_DFCHECK);
  29 }
  30
  31 static int match_tree_entry(const char *base, int baselen, const char *path, unsigned int mode, const char **paths)
  32 {
  33         const char *match;
  34         int pathlen;
  35
  36         if (!paths)
  37                 return 1;
  38         pathlen = strlen(path);
  39         while ((match = *paths++) != NULL) {
  40                 int matchlen = strlen(match);
  41
  42                 if (baselen >= matchlen) {
  43                         /* If it doesn't match, move along... */
  44                         if (strncmp(base, match, matchlen))
  45                                 continue;
  46                         /* The base is a subdirectory of a path which was specified. */
  47                         return 1;
  48                 }
  49
  50                 /* Does the base match? */
  51                 if (strncmp(base, match, baselen))
  52                         continue;
  53
  54                 match += baselen;
  55                 matchlen -= baselen;
  56
  57                 if (pathlen > matchlen)
  58                         continue;
  59
  60                 if (matchlen > pathlen) {
  61                         if (match[pathlen] != '/')
  62                                 continue;
  63                         if (!S_ISDIR(mode))
  64                                 continue;
  65                 }
  66
  67                 if (strncmp(path, match, pathlen))
  68                         continue;
  69
  70                 return 1;
  71         }
  72         return 0;
  73 }
  74
  75 int read_tree_recursive(struct tree *tree,
  76                         const char *base, int baselen,
  77                         int stage, const char **match,
  78                         read_tree_fn_t fn)
  79 {
  80         struct tree_desc desc;
  81         struct name_entry entry;
  82
  83         if (parse_tree(tree))
  84                 return -1;
  85
  86         desc.buf = tree->buffer;
  87         desc.size = tree->size;
  88
  89         while (tree_entry(&desc, &entry)) {
  90                 if (!match_tree_entry(base, baselen, entry.path, entry.mode, match))
  91                         continue;
  92
  93                 switch (fn(entry.sha1, base, baselen, entry.path, entry.mode, stage)) {
  94                 case 0:
  95                         continue;
  96                 case READ_TREE_RECURSIVE:
  97                         break;;
  98                 default:
  99                         return -1;
 100                 }
 101                 if (S_ISDIR(entry.mode)) {
 102                         int retval;
 103                         char *newbase;
 104
 105                         newbase = xmalloc(baselen + 1 + entry.pathlen);
 106                         memcpy(newbase, base, baselen);
 107                         memcpy(newbase + baselen, entry.path, entry.pathlen);
 108                         newbase[baselen + entry.pathlen] = '/';
 109                         retval = read_tree_recursive(lookup_tree(entry.sha1),
 110                                                      newbase,
 111                                                      baselen + entry.pathlen + 1,
 112                                                      stage, match, fn);
 113                         free(newbase);
 114                         if (retval)
 115                                 return -1;
 116                         continue;
 117                 }
 118         }
 119         return 0;
 120 }
 121
 122 int read_tree(struct tree *tree, int stage, const char **match)
 123 {
 124         return read_tree_recursive(tree, "", 0, stage, match, read_one_entry);
 125 }
 126
 127 struct tree *lookup_tree(const unsigned char *sha1)
 128 {
 129         struct object *obj = lookup_object(sha1);
 130         if (!obj) {
 131                 struct tree *ret = alloc_tree_node();
 132                 created_object(sha1, &ret->object);
 133                 ret->object.type = OBJ_TREE;
 134                 return ret;
 135         }
 136         if (!obj->type)
 137                 obj->type = OBJ_TREE;
 138         if (obj->type != OBJ_TREE) {
 139                 error("Object %s is a %s, not a tree",
 140                       sha1_to_hex(sha1), typename(obj->type));
 141                 return NULL;
 142         }
 143         return (struct tree *) obj;
 144 }
 145
 146 static void track_tree_refs(struct tree *item)
 147 {
 148         int n_refs = 0, i;
 149         struct object_refs *refs;
 150         struct tree_desc desc;
 151         struct name_entry entry;
 152
 153         /* Count how many entries there are.. */
 154         desc.buf = item->buffer;
 155         desc.size = item->size;
 156         while (desc.size) {
 157                 n_refs++;
 158                 update_tree_entry(&desc);
 159         }
 160
 161         /* Allocate object refs and walk it again.. */
 162         i = 0;
 163         refs = alloc_object_refs(n_refs);
 164         desc.buf = item->buffer;
 165         desc.size = item->size;
 166         while (tree_entry(&desc, &entry)) {
 167                 struct object *obj;
 168
 169                 if (S_ISDIR(entry.mode))
 170                         obj = &lookup_tree(entry.sha1)->object;
 171                 else
 172                         obj = &lookup_blob(entry.sha1)->object;
 173                 refs->ref[i++] = obj;
 174         }
 175         set_object_refs(&item->object, refs);
 176 }
 177
 178 int parse_tree_buffer(struct tree *item, void *buffer, unsigned long size)
 179 {
 180         if (item->object.parsed)
 181                 return 0;
 182         item->object.parsed = 1;
 183         item->buffer = buffer;
 184         item->size = size;
 185
 186         if (track_object_refs)
 187                 track_tree_refs(item);
 188         return 0;
 189 }
 190
 191 int parse_tree(struct tree *item)
 192 {
 193          char type[20];
 194          void *buffer;
 195          unsigned long size;
 196
 197         if (item->object.parsed)
 198                 return 0;
 199         buffer = read_sha1_file(item->object.sha1, type, &size);
 200         if (!buffer)
 201                 return error("Could not read %s",
 202                              sha1_to_hex(item->object.sha1));
 203         if (strcmp(type, tree_type)) {
 204                 free(buffer);
 205                 return error("Object %s not a tree",
 206                              sha1_to_hex(item->object.sha1));
 207         }
 208         return parse_tree_buffer(item, buffer, size);
 209 }
 210
 211 struct tree *parse_tree_indirect(const unsigned char *sha1)
 212 {
 213         struct object *obj = parse_object(sha1);
 214         do {
 215                 if (!obj)
 216                         return NULL;
 217                 if (obj->type == OBJ_TREE)
 218                         return (struct tree *) obj;
 219                 else if (obj->type == OBJ_COMMIT)
 220                         obj = &(((struct commit *) obj)->tree->object);
 221                 else if (obj->type == OBJ_TAG)
 222                         obj = ((struct tag *) obj)->tagged;
 223                 else
 224                         return NULL;
 225                 if (!obj->parsed)
 226                         parse_object(obj->sha1);
 227         } while (1);
 228 }