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 #include <stdlib.h>
   8
   9 const char *tree_type = "tree";
  10
  11 static int read_one_entry(const unsigned char *sha1, const char *base, int baselen, const char *pathname, unsigned mode, int stage)
  12 {
  13         int len;
  14         unsigned int size;
  15         struct cache_entry *ce;
  16
  17         if (S_ISDIR(mode))
  18                 return READ_TREE_RECURSIVE;
  19
  20         len = strlen(pathname);
  21         size = cache_entry_size(baselen + len);
  22         ce = xcalloc(1, size);
  23
  24         ce->ce_mode = create_ce_mode(mode);
  25         ce->ce_flags = create_ce_flags(baselen + len, stage);
  26         memcpy(ce->name, base, baselen);
  27         memcpy(ce->name + baselen, pathname, len+1);
  28         memcpy(ce->sha1, sha1, 20);
  29         return add_cache_entry(ce, ADD_CACHE_OK_TO_ADD|ADD_CACHE_SKIP_DFCHECK);
  30 }
  31
  32 static int match_tree_entry(const char *base, int baselen, const char *path, unsigned int mode, const char **paths)
  33 {
  34         const char *match;
  35         int pathlen;
  36
  37         if (!paths)
  38                 return 1;
  39         pathlen = strlen(path);
  40         while ((match = *paths++) != NULL) {
  41                 int matchlen = strlen(match);
  42
  43                 if (baselen >= matchlen) {
  44                         /* If it doesn't match, move along... */
  45                         if (strncmp(base, match, matchlen))
  46                                 continue;
  47                         /* The base is a subdirectory of a path which was specified. */
  48                         return 1;
  49                 }
  50
  51                 /* Does the base match? */
  52                 if (strncmp(base, match, baselen))
  53                         continue;
  54
  55                 match += baselen;
  56                 matchlen -= baselen;
  57
  58                 if (pathlen > matchlen)
  59                         continue;
  60
  61                 if (matchlen > pathlen) {
  62                         if (match[pathlen] != '/')
  63                                 continue;
  64                         if (!S_ISDIR(mode))
  65                                 continue;
  66                 }
  67
  68                 if (strncmp(path, match, pathlen))
  69                         continue;
  70
  71                 return 1;
  72         }
  73         return 0;
  74 }
  75
  76 int read_tree_recursive(struct tree *tree,
  77                         const char *base, int baselen,
  78                         int stage, const char **match,
  79                         read_tree_fn_t fn)
  80 {
  81         struct tree_entry_list *list;
  82         if (parse_tree(tree))
  83                 return -1;
  84         list = tree->entries;
  85         while (list) {
  86                 struct tree_entry_list *current = list;
  87                 list = list->next;
  88                 if (!match_tree_entry(base, baselen, current->name,
  89                                       current->mode, match))
  90                         continue;
  91
  92                 switch (fn(current->sha1, base, baselen,
  93                            current->name, current->mode, stage)) {
  94                 case 0:
  95                         continue;
  96                 case READ_TREE_RECURSIVE:
  97                         break;;
  98                 default:
  99                         return -1;
 100                 }
 101                 if (current->directory) {
 102                         int retval;
 103                         int pathlen = strlen(current->name);
 104                         char *newbase;
 105
 106                         newbase = xmalloc(baselen + 1 + pathlen);
 107                         memcpy(newbase, base, baselen);
 108                         memcpy(newbase + baselen, current->name, pathlen);
 109                         newbase[baselen + pathlen] = '/';
 110                         retval = read_tree_recursive(lookup_tree(current->sha1),
 111                                                      newbase,
 112                                                      baselen + pathlen + 1,
 113                                                      stage, match, fn);
 114                         free(newbase);
 115                         if (retval)
 116                                 return -1;
 117                         continue;
 118                 }
 119         }
 120         return 0;
 121 }
 122
 123 int read_tree(struct tree *tree, int stage, const char **match)
 124 {
 125         return read_tree_recursive(tree, "", 0, stage, match, read_one_entry);
 126 }
 127
 128 struct tree *lookup_tree(const unsigned char *sha1)
 129 {
 130         struct object *obj = lookup_object(sha1);
 131         if (!obj) {
 132                 struct tree *ret = xcalloc(1, sizeof(struct tree));
 133                 created_object(sha1, &ret->object);
 134                 ret->object.type = tree_type;
 135                 return ret;
 136         }
 137         if (!obj->type)
 138                 obj->type = tree_type;
 139         if (obj->type != tree_type) {
 140                 error("Object %s is a %s, not a tree",
 141                       sha1_to_hex(sha1), obj->type);
 142                 return NULL;
 143         }
 144         return (struct tree *) obj;
 145 }
 146
 147 int parse_tree_buffer(struct tree *item, void *buffer, unsigned long size)
 148 {
 149         struct tree_desc desc;
 150         struct tree_entry_list **list_p;
 151         int n_refs = 0;
 152
 153         if (item->object.parsed)
 154                 return 0;
 155         item->object.parsed = 1;
 156         item->buffer = buffer;
 157         item->size = size;
 158
 159         desc.buf = buffer;
 160         desc.size = size;
 161
 162         list_p = &item->entries;
 163         while (desc.size) {
 164                 unsigned mode;
 165                 const char *path;
 166                 const unsigned char *sha1;
 167                 struct tree_entry_list *entry;
 168
 169                 sha1 = tree_entry_extract(&desc, &path, &mode);
 170
 171                 entry = xmalloc(sizeof(struct tree_entry_list));
 172                 entry->name = path;
 173                 entry->sha1 = sha1;
 174                 entry->mode = mode;
 175                 entry->directory = S_ISDIR(mode) != 0;
 176                 entry->executable = (mode & S_IXUSR) != 0;
 177                 entry->symlink = S_ISLNK(mode) != 0;
 178                 entry->zeropad = *(const char *)(desc.buf) == '0';
 179                 entry->next = NULL;
 180
 181                 update_tree_entry(&desc);
 182                 n_refs++;
 183                 *list_p = entry;
 184                 list_p = &entry->next;
 185         }
 186
 187         if (track_object_refs) {
 188                 struct tree_entry_list *entry;
 189                 unsigned i = 0;
 190                 struct object_refs *refs = alloc_object_refs(n_refs);
 191                 for (entry = item->entries; entry; entry = entry->next) {
 192                         struct object *obj;
 193
 194                         if (entry->directory)
 195                                 obj = &lookup_tree(entry->sha1)->object;
 196                         else
 197                                 obj = &lookup_blob(entry->sha1)->object;
 198                         refs->ref[i++] = obj;
 199                 }
 200
 201                 set_object_refs(&item->object, refs);
 202         }
 203
 204         return 0;
 205 }
 206
 207 int parse_tree(struct tree *item)
 208 {
 209          char type[20];
 210          void *buffer;
 211          unsigned long size;
 212
 213         if (item->object.parsed)
 214                 return 0;
 215         buffer = read_sha1_file(item->object.sha1, type, &size);
 216         if (!buffer)
 217                 return error("Could not read %s",
 218                              sha1_to_hex(item->object.sha1));
 219         if (strcmp(type, tree_type)) {
 220                 free(buffer);
 221                 return error("Object %s not a tree",
 222                              sha1_to_hex(item->object.sha1));
 223         }
 224         return parse_tree_buffer(item, buffer, size);
 225 }
 226
 227 struct tree *parse_tree_indirect(const unsigned char *sha1)
 228 {
 229         struct object *obj = parse_object(sha1);
 230         do {
 231                 if (!obj)
 232                         return NULL;
 233                 if (obj->type == tree_type)
 234                         return (struct tree *) obj;
 235                 else if (obj->type == commit_type)
 236                         obj = &(((struct commit *) obj)->tree->object);
 237                 else if (obj->type == tag_type)
 238                         obj = ((struct tag *) obj)->tagged;
 239                 else
 240                         return NULL;
 241                 if (!obj->parsed)
 242                         parse_object(obj->sha1);
 243         } while (1);
 244 }