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_desc desc;
  82         struct name_entry entry;
  83
  84         if (parse_tree(tree))
  85                 return -1;
  86
  87         desc.buf = tree->buffer;
  88         desc.size = tree->size;
  89
  90         while (tree_entry(&desc, &entry)) {
  91                 if (!match_tree_entry(base, baselen, entry.path, entry.mode, match))
  92                         continue;
  93
  94                 switch (fn(entry.sha1, base, baselen, entry.path, entry.mode, stage)) {
  95                 case 0:
  96                         continue;
  97                 case READ_TREE_RECURSIVE:
  98                         break;;
  99                 default:
 100                         return -1;
 101                 }
 102                 if (S_ISDIR(entry.mode)) {
 103                         int retval;
 104                         char *newbase;
 105
 106                         newbase = xmalloc(baselen + 1 + entry.pathlen);
 107                         memcpy(newbase, base, baselen);
 108                         memcpy(newbase + baselen, entry.path, entry.pathlen);
 109                         newbase[baselen + entry.pathlen] = '/';
 110                         retval = read_tree_recursive(lookup_tree(entry.sha1),
 111                                                      newbase,
 112                                                      baselen + entry.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 = alloc_tree_node();
 133                 created_object(sha1, &ret->object);
 134                 ret->object.type = OBJ_TREE;
 135                 return ret;
 136         }
 137         if (!obj->type)
 138                 obj->type = OBJ_TREE;
 139         if (obj->type != OBJ_TREE) {
 140                 error("Object %s is a %s, not a tree",
 141                       sha1_to_hex(sha1), typename(obj->type));
 142                 return NULL;
 143         }
 144         return (struct tree *) obj;
 145 }
 146
 147 static void track_tree_refs(struct tree *item)
 148 {
 149         int n_refs = 0, i;
 150         struct object_refs *refs;
 151         struct tree_desc desc;
 152         struct name_entry entry;
 153
 154         /* Count how many entries there are.. */
 155         desc.buf = item->buffer;
 156         desc.size = item->size;
 157         while (desc.size) {
 158                 n_refs++;
 159                 update_tree_entry(&desc);
 160         }
 161
 162         /* Allocate object refs and walk it again.. */
 163         i = 0;
 164         refs = alloc_object_refs(n_refs);
 165         desc.buf = item->buffer;
 166         desc.size = item->size;
 167         while (tree_entry(&desc, &entry)) {
 168                 struct object *obj;
 169
 170                 if (S_ISDIR(entry.mode))
 171                         obj = &lookup_tree(entry.sha1)->object;
 172                 else
 173                         obj = &lookup_blob(entry.sha1)->object;
 174                 refs->ref[i++] = obj;
 175         }
 176         set_object_refs(&item->object, refs);
 177 }
 178
 179 int parse_tree_buffer(struct tree *item, void *buffer, unsigned long size)
 180 {
 181         if (item->object.parsed)
 182                 return 0;
 183         item->object.parsed = 1;
 184         item->buffer = buffer;
 185         item->size = size;
 186
 187         if (track_object_refs)
 188                 track_tree_refs(item);
 189         return 0;
 190 }
 191
 192 int parse_tree(struct tree *item)
 193 {
 194          char type[20];
 195          void *buffer;
 196          unsigned long size;
 197
 198         if (item->object.parsed)
 199                 return 0;
 200         buffer = read_sha1_file(item->object.sha1, type, &size);
 201         if (!buffer)
 202                 return error("Could not read %s",
 203                              sha1_to_hex(item->object.sha1));
 204         if (strcmp(type, tree_type)) {
 205                 free(buffer);
 206                 return error("Object %s not a tree",
 207                              sha1_to_hex(item->object.sha1));
 208         }
 209         return parse_tree_buffer(item, buffer, size);
 210 }
 211
 212 struct tree *parse_tree_indirect(const unsigned char *sha1)
 213 {
 214         struct object *obj = parse_object(sha1);
 215         do {
 216                 if (!obj)
 217                         return NULL;
 218                 if (obj->type == OBJ_TREE)
 219                         return (struct tree *) obj;
 220                 else if (obj->type == OBJ_COMMIT)
 221                         obj = &(((struct commit *) obj)->tree->object);
 222                 else if (obj->type == OBJ_TAG)
 223                         obj = ((struct tag *) obj)->tagged;
 224                 else
 225                         return NULL;
 226                 if (!obj->parsed)
 227                         parse_object(obj->sha1);
 228         } while (1);
 229 }