tree.c

   1 #include "tree.h"
   2 #include "blob.h"
   3 #include "commit.h"
   4 #include "tag.h"
   5 #include "cache.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 = strlen(pathname);
  13         unsigned int size = cache_entry_size(baselen + len);
  14         struct cache_entry *ce = xmalloc(size);
  15
  16         memset(ce, 0, size);
  17
  18         ce->ce_mode = create_ce_mode(mode);
  19         ce->ce_flags = create_ce_flags(baselen + len, stage);
  20         memcpy(ce->name, base, baselen);
  21         memcpy(ce->name + baselen, pathname, len+1);
  22         memcpy(ce->sha1, sha1, 20);
  23         return add_cache_entry(ce, ADD_CACHE_OK_TO_ADD|ADD_CACHE_SKIP_DFCHECK);
  24 }
  25
  26 static int match_tree_entry(const char *base, int baselen, const char *path, unsigned int mode, const char **paths)
  27 {
  28         const char *match;
  29         int pathlen;
  30
  31         if (!paths)
  32                 return 1;
  33         pathlen = strlen(path);
  34         while ((match = *paths++) != NULL) {
  35                 int matchlen = strlen(match);
  36
  37                 if (baselen >= matchlen) {
  38                         /* If it doesn't match, move along... */
  39                         if (strncmp(base, match, matchlen))
  40                                 continue;
  41                         /* The base is a subdirectory of a path which was specified. */
  42                         return 1;
  43                 }
  44
  45                 /* Does the base match? */
  46                 if (strncmp(base, match, baselen))
  47                         continue;
  48
  49                 match += baselen;
  50                 matchlen -= baselen;
  51
  52                 if (pathlen > matchlen)
  53                         continue;
  54
  55                 if (matchlen > pathlen) {
  56                         if (match[pathlen] != '/')
  57                                 continue;
  58                         if (!S_ISDIR(mode))
  59                                 continue;
  60                 }
  61
  62                 if (strncmp(path, match, pathlen))
  63                         continue;
  64
  65                 return 1;
  66         }
  67         return 0;
  68 }
  69
  70 static int read_tree_recursive(void *buffer, unsigned long size,
  71                                const char *base, int baselen,
  72                                int stage, const char **match)
  73 {
  74         while (size) {
  75                 int len = strlen(buffer)+1;
  76                 unsigned char *sha1 = buffer + len;
  77                 char *path = strchr(buffer, ' ')+1;
  78                 unsigned int mode;
  79
  80                 if (size < len + 20 || sscanf(buffer, "%o", &mode) != 1)
  81                         return -1;
  82
  83                 buffer = sha1 + 20;
  84                 size -= len + 20;
  85
  86                 if (!match_tree_entry(base, baselen, path, mode, match))
  87                         continue;
  88
  89                 if (S_ISDIR(mode)) {
  90                         int retval;
  91                         int pathlen = strlen(path);
  92                         char *newbase;
  93                         void *eltbuf;
  94                         char elttype[20];
  95                         unsigned long eltsize;
  96
  97                         eltbuf = read_sha1_file(sha1, elttype, &eltsize);
  98                         if (!eltbuf || strcmp(elttype, "tree")) {
  99                                 if (eltbuf) free(eltbuf);
 100                                 return -1;
 101                         }
 102                         newbase = xmalloc(baselen + 1 + pathlen);
 103                         memcpy(newbase, base, baselen);
 104                         memcpy(newbase + baselen, path, pathlen);
 105                         newbase[baselen + pathlen] = '/';
 106                         retval = read_tree_recursive(eltbuf, eltsize,
 107                                                      newbase,
 108                                                      baselen + pathlen + 1,
 109                                                      stage, match);
 110                         free(eltbuf);
 111                         free(newbase);
 112                         if (retval)
 113                                 return -1;
 114                         continue;
 115                 }
 116                 if (read_one_entry(sha1, base, baselen, path, mode, stage) < 0)
 117                         return -1;
 118         }
 119         return 0;
 120 }
 121
 122 int read_tree(void *buffer, unsigned long size, int stage, const char **match)
 123 {
 124         return read_tree_recursive(buffer, size, "", 0, stage, match);
 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 = xmalloc(sizeof(struct tree));
 132                 memset(ret, 0, 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         void *bufptr = buffer;
 150         struct tree_entry_list **list_p;
 151
 152         if (item->object.parsed)
 153                 return 0;
 154         item->object.parsed = 1;
 155         list_p = &item->entries;
 156         while (size) {
 157                 struct object *obj;
 158                 struct tree_entry_list *entry;
 159                 int len = 1+strlen(bufptr);
 160                 unsigned char *file_sha1 = bufptr + len;
 161                 char *path = strchr(bufptr, ' ');
 162                 unsigned int mode;
 163                 if (size < len + 20 || !path ||
 164                     sscanf(bufptr, "%o", &mode) != 1)
 165                         return -1;
 166
 167                 entry = xmalloc(sizeof(struct tree_entry_list));
 168                 entry->name = strdup(path + 1);
 169                 entry->directory = S_ISDIR(mode) != 0;
 170                 entry->executable = (mode & S_IXUSR) != 0;
 171                 entry->symlink = S_ISLNK(mode) != 0;
 172                 entry->zeropad = *(char *)bufptr == '0';
 173                 entry->mode = mode;
 174                 entry->next = NULL;
 175
 176                 bufptr += len + 20;
 177                 size -= len + 20;
 178
 179                 if (entry->directory) {
 180                         entry->item.tree = lookup_tree(file_sha1);
 181                         obj = &entry->item.tree->object;
 182                 } else {
 183                         entry->item.blob = lookup_blob(file_sha1);
 184                         obj = &entry->item.blob->object;
 185                 }
 186                 if (obj)
 187                         add_ref(&item->object, obj);
 188                 entry->parent = NULL; /* needs to be filled by the user */
 189                 *list_p = entry;
 190                 list_p = &entry->next;
 191         }
 192         return 0;
 193 }
 194
 195 int parse_tree(struct tree *item)
 196 {
 197          char type[20];
 198          void *buffer;
 199          unsigned long size;
 200          int ret;
 201
 202         if (item->object.parsed)
 203                 return 0;
 204         buffer = read_sha1_file(item->object.sha1, type, &size);
 205         if (!buffer)
 206                 return error("Could not read %s",
 207                              sha1_to_hex(item->object.sha1));
 208         if (strcmp(type, tree_type)) {
 209                 free(buffer);
 210                 return error("Object %s not a tree",
 211                              sha1_to_hex(item->object.sha1));
 212         }
 213         ret = parse_tree_buffer(item, buffer, size);
 214         free(buffer);
 215         return ret;
 216 }
 217
 218 struct tree *parse_tree_indirect(const unsigned char *sha1)
 219 {
 220         struct object *obj = parse_object(sha1);
 221         do {
 222                 if (!obj)
 223                         return NULL;
 224                 if (obj->type == tree_type)
 225                         return (struct tree *) obj;
 226                 else if (obj->type == commit_type)
 227                         obj = &(((struct commit *) obj)->tree->object);
 228                 else if (obj->type == tag_type)
 229                         obj = ((struct tag *) obj)->tagged;
 230                 else
 231                         return NULL;
 232                 if (!obj->parsed)
 233                         parse_object(obj->sha1);
 234         } while (1);
 235 }