tree.c

   1 #include "cache.h"
   2 #include "tree.h"
   3 #include "blob.h"
   4 #include "commit.h"
   5 #include "tag.h"
   6 #include <stdlib.h>
   7
   8 const char *tree_type = "tree";
   9
  10 static int read_one_entry(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 = xmalloc(size);
  22
  23         memset(ce, 0, size);
  24
  25         ce->ce_mode = create_ce_mode(mode);
  26         ce->ce_flags = create_ce_flags(baselen + len, stage);
  27         memcpy(ce->name, base, baselen);
  28         memcpy(ce->name + baselen, pathname, len+1);
  29         memcpy(ce->sha1, sha1, 20);
  30         return add_cache_entry(ce, ADD_CACHE_OK_TO_ADD|ADD_CACHE_SKIP_DFCHECK);
  31 }
  32
  33 static int match_tree_entry(const char *base, int baselen, const char *path, unsigned int mode, const char **paths)
  34 {
  35         const char *match;
  36         int pathlen;
  37
  38         if (!paths)
  39                 return 1;
  40         pathlen = strlen(path);
  41         while ((match = *paths++) != NULL) {
  42                 int matchlen = strlen(match);
  43
  44                 if (baselen >= matchlen) {
  45                         /* If it doesn't match, move along... */
  46                         if (strncmp(base, match, matchlen))
  47                                 continue;
  48                         /* The base is a subdirectory of a path which was specified. */
  49                         return 1;
  50                 }
  51
  52                 /* Does the base match? */
  53                 if (strncmp(base, match, baselen))
  54                         continue;
  55
  56                 match += baselen;
  57                 matchlen -= baselen;
  58
  59                 if (pathlen > matchlen)
  60                         continue;
  61
  62                 if (matchlen > pathlen) {
  63                         if (match[pathlen] != '/')
  64                                 continue;
  65                         if (!S_ISDIR(mode))
  66                                 continue;
  67                 }
  68
  69                 if (strncmp(path, match, pathlen))
  70                         continue;
  71
  72                 return 1;
  73         }
  74         return 0;
  75 }
  76
  77 int read_tree_recursive(void *buffer, unsigned long size,
  78                         const char *base, int baselen,
  79                         int stage, const char **match,
  80                         read_tree_fn_t fn)
  81 {
  82         while (size) {
  83                 int len = strlen(buffer)+1;
  84                 unsigned char *sha1 = buffer + len;
  85                 char *path = strchr(buffer, ' ')+1;
  86                 unsigned int mode;
  87
  88                 if (size < len + 20 || sscanf(buffer, "%o", &mode) != 1)
  89                         return -1;
  90
  91                 buffer = sha1 + 20;
  92                 size -= len + 20;
  93
  94                 if (!match_tree_entry(base, baselen, path, mode, match))
  95                         continue;
  96
  97                 switch (fn(sha1, base, baselen, path, mode, stage)) {
  98                 case 0:
  99                         continue;
 100                 case READ_TREE_RECURSIVE:
 101                         break;;
 102                 default:
 103                         return -1;
 104                 }
 105                 if (S_ISDIR(mode)) {
 106                         int retval;
 107                         int pathlen = strlen(path);
 108                         char *newbase;
 109                         void *eltbuf;
 110                         char elttype[20];
 111                         unsigned long eltsize;
 112
 113                         eltbuf = read_sha1_file(sha1, elttype, &eltsize);
 114                         if (!eltbuf || strcmp(elttype, "tree")) {
 115                                 if (eltbuf) free(eltbuf);
 116                                 return -1;
 117                         }
 118                         newbase = xmalloc(baselen + 1 + pathlen);
 119                         memcpy(newbase, base, baselen);
 120                         memcpy(newbase + baselen, path, pathlen);
 121                         newbase[baselen + pathlen] = '/';
 122                         retval = read_tree_recursive(eltbuf, eltsize,
 123                                                      newbase,
 124                                                      baselen + pathlen + 1,
 125                                                      stage, match, fn);
 126                         free(eltbuf);
 127                         free(newbase);
 128                         if (retval)
 129                                 return -1;
 130                         continue;
 131                 }
 132         }
 133         return 0;
 134 }
 135
 136 int read_tree(void *buffer, unsigned long size, int stage, const char **match)
 137 {
 138         return read_tree_recursive(buffer, size, "", 0, stage, match, read_one_entry);
 139 }
 140
 141 struct tree *lookup_tree(const unsigned char *sha1)
 142 {
 143         struct object *obj = lookup_object(sha1);
 144         if (!obj) {
 145                 struct tree *ret = xmalloc(sizeof(struct tree));
 146                 memset(ret, 0, sizeof(struct tree));
 147                 created_object(sha1, &ret->object);
 148                 ret->object.type = tree_type;
 149                 return ret;
 150         }
 151         if (!obj->type)
 152                 obj->type = tree_type;
 153         if (obj->type != tree_type) {
 154                 error("Object %s is a %s, not a tree",
 155                       sha1_to_hex(sha1), obj->type);
 156                 return NULL;
 157         }
 158         return (struct tree *) obj;
 159 }
 160
 161 int parse_tree_buffer(struct tree *item, void *buffer, unsigned long size)
 162 {
 163         void *bufptr = buffer;
 164         struct tree_entry_list **list_p;
 165         int n_refs = 0;
 166
 167         if (item->object.parsed)
 168                 return 0;
 169         item->object.parsed = 1;
 170         list_p = &item->entries;
 171         while (size) {
 172                 struct object *obj;
 173                 struct tree_entry_list *entry;
 174                 int len = 1+strlen(bufptr);
 175                 unsigned char *file_sha1 = bufptr + len;
 176                 char *path = strchr(bufptr, ' ');
 177                 unsigned int mode;
 178                 if (size < len + 20 || !path ||
 179                     sscanf(bufptr, "%o", &mode) != 1)
 180                         return -1;
 181
 182                 entry = xmalloc(sizeof(struct tree_entry_list));
 183                 entry->name = strdup(path + 1);
 184                 entry->directory = S_ISDIR(mode) != 0;
 185                 entry->executable = (mode & S_IXUSR) != 0;
 186                 entry->symlink = S_ISLNK(mode) != 0;
 187                 entry->zeropad = *(char *)bufptr == '0';
 188                 entry->mode = mode;
 189                 entry->next = NULL;
 190
 191                 bufptr += len + 20;
 192                 size -= len + 20;
 193
 194                 if (entry->directory) {
 195                         entry->item.tree = lookup_tree(file_sha1);
 196                         obj = &entry->item.tree->object;
 197                 } else {
 198                         entry->item.blob = lookup_blob(file_sha1);
 199                         obj = &entry->item.blob->object;
 200                 }
 201                 if (obj)
 202                         n_refs++;
 203                 *list_p = entry;
 204                 list_p = &entry->next;
 205         }
 206
 207         if (track_object_refs) {
 208                 struct tree_entry_list *entry;
 209                 unsigned i = 0;
 210                 struct object_refs *refs = alloc_object_refs(n_refs);
 211                 for (entry = item->entries; entry; entry = entry->next)
 212                         refs->ref[i++] = entry->item.any;
 213                 set_object_refs(&item->object, refs);
 214         }
 215
 216         return 0;
 217 }
 218
 219 int parse_tree(struct tree *item)
 220 {
 221          char type[20];
 222          void *buffer;
 223          unsigned long size;
 224          int ret;
 225
 226         if (item->object.parsed)
 227                 return 0;
 228         buffer = read_sha1_file(item->object.sha1, type, &size);
 229         if (!buffer)
 230                 return error("Could not read %s",
 231                              sha1_to_hex(item->object.sha1));
 232         if (strcmp(type, tree_type)) {
 233                 free(buffer);
 234                 return error("Object %s not a tree",
 235                              sha1_to_hex(item->object.sha1));
 236         }
 237         ret = parse_tree_buffer(item, buffer, size);
 238         free(buffer);
 239         return ret;
 240 }
 241
 242 struct tree *parse_tree_indirect(const unsigned char *sha1)
 243 {
 244         struct object *obj = parse_object(sha1);
 245         do {
 246                 if (!obj)
 247                         return NULL;
 248                 if (obj->type == tree_type)
 249                         return (struct tree *) obj;
 250                 else if (obj->type == commit_type)
 251                         obj = &(((struct commit *) obj)->tree->object);
 252                 else if (obj->type == tag_type)
 253                         obj = ((struct tag *) obj)->tagged;
 254                 else
 255                         return NULL;
 256                 if (!obj->parsed)
 257                         parse_object(obj->sha1);
 258         } while (1);
 259 }