tree.c

   1 #include "tree.h"
   2 #include "blob.h"
   3 #include "cache.h"
   4 #include <stdlib.h>
   5
   6 const char *tree_type = "tree";
   7
   8 static int read_one_entry(unsigned char *sha1, const char *base, int baselen, const char *pathname, unsigned mode, int stage)
   9 {
  10         int len = strlen(pathname);
  11         unsigned int size = cache_entry_size(baselen + len);
  12         struct cache_entry *ce = xmalloc(size);
  13
  14         memset(ce, 0, size);
  15
  16         ce->ce_mode = create_ce_mode(mode);
  17         ce->ce_flags = create_ce_flags(baselen + len, stage);
  18         memcpy(ce->name, base, baselen);
  19         memcpy(ce->name + baselen, pathname, len+1);
  20         memcpy(ce->sha1, sha1, 20);
  21         return add_cache_entry(ce, ADD_CACHE_OK_TO_ADD|ADD_CACHE_SKIP_DFCHECK);
  22 }
  23
  24 static int match_tree_entry(const char *base, int baselen, const char *path, unsigned int mode, char **paths)
  25 {
  26         char *match;
  27         int pathlen;
  28
  29         if (!paths)
  30                 return 1;
  31         pathlen = strlen(path);
  32         while ((match = *paths++) != NULL) {
  33                 int matchlen = strlen(match);
  34
  35                 if (baselen >= matchlen) {
  36                         /* If it doesn't match, move along... */
  37                         if (strncmp(base, match, matchlen))
  38                                 continue;
  39                         /* The base is a subdirectory of a path which was specified. */
  40                         return 1;
  41                 }
  42
  43                 /* Does the base match? */
  44                 if (strncmp(base, match, baselen))
  45                         continue;
  46
  47                 match += baselen;
  48                 matchlen -= baselen;
  49
  50                 if (pathlen > matchlen)
  51                         continue;
  52
  53                 if (matchlen > pathlen) {
  54                         if (match[pathlen] != '/')
  55                                 continue;
  56                         if (!S_ISDIR(mode))
  57                                 continue;
  58                 }
  59
  60                 if (strncmp(path, match, pathlen))
  61                         continue;
  62         }
  63         return 0;
  64 }
  65
  66 static int read_tree_recursive(void *buffer, unsigned long size,
  67                                const char *base, int baselen,
  68                                int stage, char **match)
  69 {
  70         while (size) {
  71                 int len = strlen(buffer)+1;
  72                 unsigned char *sha1 = buffer + len;
  73                 char *path = strchr(buffer, ' ')+1;
  74                 unsigned int mode;
  75
  76                 if (size < len + 20 || sscanf(buffer, "%o", &mode) != 1)
  77                         return -1;
  78
  79                 buffer = sha1 + 20;
  80                 size -= len + 20;
  81
  82                 if (!match_tree_entry(base, baselen, path, mode, match))
  83                         continue;
  84
  85                 if (S_ISDIR(mode)) {
  86                         int retval;
  87                         int pathlen = strlen(path);
  88                         char *newbase;
  89                         void *eltbuf;
  90                         char elttype[20];
  91                         unsigned long eltsize;
  92
  93                         eltbuf = read_sha1_file(sha1, elttype, &eltsize);
  94                         if (!eltbuf || strcmp(elttype, "tree")) {
  95                                 if (eltbuf) free(eltbuf);
  96                                 return -1;
  97                         }
  98                         newbase = xmalloc(baselen + 1 + pathlen);
  99                         memcpy(newbase, base, baselen);
 100                         memcpy(newbase + baselen, path, pathlen);
 101                         newbase[baselen + pathlen] = '/';
 102                         retval = read_tree_recursive(eltbuf, eltsize,
 103                                                      newbase,
 104                                                      baselen + pathlen + 1,
 105                                                      stage, match);
 106                         free(eltbuf);
 107                         free(newbase);
 108                         if (retval)
 109                                 return -1;
 110                         continue;
 111                 }
 112                 if (read_one_entry(sha1, base, baselen, path, mode, stage) < 0)
 113                         return -1;
 114         }
 115         return 0;
 116 }
 117
 118 int read_tree(void *buffer, unsigned long size, int stage, char **match)
 119 {
 120         return read_tree_recursive(buffer, size, "", 0, stage, match);
 121 }
 122
 123 struct tree *lookup_tree(const unsigned char *sha1)
 124 {
 125         struct object *obj = lookup_object(sha1);
 126         if (!obj) {
 127                 struct tree *ret = xmalloc(sizeof(struct tree));
 128                 memset(ret, 0, sizeof(struct tree));
 129                 created_object(sha1, &ret->object);
 130                 ret->object.type = tree_type;
 131                 return ret;
 132         }
 133         if (!obj->type)
 134                 obj->type = tree_type;
 135         if (obj->type != tree_type) {
 136                 error("Object %s is a %s, not a tree",
 137                       sha1_to_hex(sha1), obj->type);
 138                 return NULL;
 139         }
 140         return (struct tree *) obj;
 141 }
 142
 143 int parse_tree_buffer(struct tree *item, void *buffer, unsigned long size)
 144 {
 145         void *bufptr = buffer;
 146         struct tree_entry_list **list_p;
 147
 148         if (item->object.parsed)
 149                 return 0;
 150         item->object.parsed = 1;
 151         list_p = &item->entries;
 152         while (size) {
 153                 struct object *obj;
 154                 struct tree_entry_list *entry;
 155                 int len = 1+strlen(bufptr);
 156                 unsigned char *file_sha1 = bufptr + len;
 157                 char *path = strchr(bufptr, ' ');
 158                 unsigned int mode;
 159                 if (size < len + 20 || !path ||
 160                     sscanf(bufptr, "%o", &mode) != 1)
 161                         return -1;
 162
 163                 entry = xmalloc(sizeof(struct tree_entry_list));
 164                 entry->name = strdup(path + 1);
 165                 entry->directory = S_ISDIR(mode) != 0;
 166                 entry->executable = (mode & S_IXUSR) != 0;
 167                 entry->symlink = S_ISLNK(mode) != 0;
 168                 entry->mode = mode;
 169                 entry->next = NULL;
 170
 171                 bufptr += len + 20;
 172                 size -= len + 20;
 173
 174                 if (entry->directory) {
 175                         entry->item.tree = lookup_tree(file_sha1);
 176                         obj = &entry->item.tree->object;
 177                 } else {
 178                         entry->item.blob = lookup_blob(file_sha1);
 179                         obj = &entry->item.blob->object;
 180                 }
 181                 if (obj)
 182                         add_ref(&item->object, obj);
 183                 entry->parent = NULL; /* needs to be filled by the user */
 184                 *list_p = entry;
 185                 list_p = &entry->next;
 186         }
 187         return 0;
 188 }
 189
 190 int parse_tree(struct tree *item)
 191 {
 192          char type[20];
 193          void *buffer;
 194          unsigned long size;
 195          int ret;
 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         ret = parse_tree_buffer(item, buffer, size);
 209         free(buffer);
 210         return ret;
 211 }