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, const char **paths)
  25 {
  26         const 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 1;
  64         }
  65         return 0;
  66 }
  67
  68 static int read_tree_recursive(void *buffer, unsigned long size,
  69                                const char *base, int baselen,
  70                                int stage, const char **match)
  71 {
  72         while (size) {
  73                 int len = strlen(buffer)+1;
  74                 unsigned char *sha1 = buffer + len;
  75                 char *path = strchr(buffer, ' ')+1;
  76                 unsigned int mode;
  77
  78                 if (size < len + 20 || sscanf(buffer, "%o", &mode) != 1)
  79                         return -1;
  80
  81                 buffer = sha1 + 20;
  82                 size -= len + 20;
  83
  84                 if (!match_tree_entry(base, baselen, path, mode, match))
  85                         continue;
  86
  87                 if (S_ISDIR(mode)) {
  88                         int retval;
  89                         int pathlen = strlen(path);
  90                         char *newbase;
  91                         void *eltbuf;
  92                         char elttype[20];
  93                         unsigned long eltsize;
  94
  95                         eltbuf = read_sha1_file(sha1, elttype, &eltsize);
  96                         if (!eltbuf || strcmp(elttype, "tree")) {
  97                                 if (eltbuf) free(eltbuf);
  98                                 return -1;
  99                         }
 100                         newbase = xmalloc(baselen + 1 + pathlen);
 101                         memcpy(newbase, base, baselen);
 102                         memcpy(newbase + baselen, path, pathlen);
 103                         newbase[baselen + pathlen] = '/';
 104                         retval = read_tree_recursive(eltbuf, eltsize,
 105                                                      newbase,
 106                                                      baselen + pathlen + 1,
 107                                                      stage, match);
 108                         free(eltbuf);
 109                         free(newbase);
 110                         if (retval)
 111                                 return -1;
 112                         continue;
 113                 }
 114                 if (read_one_entry(sha1, base, baselen, path, mode, stage) < 0)
 115                         return -1;
 116         }
 117         return 0;
 118 }
 119
 120 int read_tree(void *buffer, unsigned long size, int stage, const char **match)
 121 {
 122         return read_tree_recursive(buffer, size, "", 0, stage, match);
 123 }
 124
 125 struct tree *lookup_tree(const unsigned char *sha1)
 126 {
 127         struct object *obj = lookup_object(sha1);
 128         if (!obj) {
 129                 struct tree *ret = xmalloc(sizeof(struct tree));
 130                 memset(ret, 0, sizeof(struct tree));
 131                 created_object(sha1, &ret->object);
 132                 ret->object.type = tree_type;
 133                 return ret;
 134         }
 135         if (!obj->type)
 136                 obj->type = tree_type;
 137         if (obj->type != tree_type) {
 138                 error("Object %s is a %s, not a tree",
 139                       sha1_to_hex(sha1), obj->type);
 140                 return NULL;
 141         }
 142         return (struct tree *) obj;
 143 }
 144
 145 int parse_tree_buffer(struct tree *item, void *buffer, unsigned long size)
 146 {
 147         void *bufptr = buffer;
 148         struct tree_entry_list **list_p;
 149
 150         if (item->object.parsed)
 151                 return 0;
 152         item->object.parsed = 1;
 153         list_p = &item->entries;
 154         while (size) {
 155                 struct object *obj;
 156                 struct tree_entry_list *entry;
 157                 int len = 1+strlen(bufptr);
 158                 unsigned char *file_sha1 = bufptr + len;
 159                 char *path = strchr(bufptr, ' ');
 160                 unsigned int mode;
 161                 if (size < len + 20 || !path ||
 162                     sscanf(bufptr, "%o", &mode) != 1)
 163                         return -1;
 164
 165                 entry = xmalloc(sizeof(struct tree_entry_list));
 166                 entry->name = strdup(path + 1);
 167                 entry->directory = S_ISDIR(mode) != 0;
 168                 entry->executable = (mode & S_IXUSR) != 0;
 169                 entry->symlink = S_ISLNK(mode) != 0;
 170                 entry->mode = mode;
 171                 entry->next = NULL;
 172
 173                 bufptr += len + 20;
 174                 size -= len + 20;
 175
 176                 if (entry->directory) {
 177                         entry->item.tree = lookup_tree(file_sha1);
 178                         obj = &entry->item.tree->object;
 179                 } else {
 180                         entry->item.blob = lookup_blob(file_sha1);
 181                         obj = &entry->item.blob->object;
 182                 }
 183                 if (obj)
 184                         add_ref(&item->object, obj);
 185                 entry->parent = NULL; /* needs to be filled by the user */
 186                 *list_p = entry;
 187                 list_p = &entry->next;
 188         }
 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          int ret;
 198
 199         if (item->object.parsed)
 200                 return 0;
 201         buffer = read_sha1_file(item->object.sha1, type, &size);
 202         if (!buffer)
 203                 return error("Could not read %s",
 204                              sha1_to_hex(item->object.sha1));
 205         if (strcmp(type, tree_type)) {
 206                 free(buffer);
 207                 return error("Object %s not a tree",
 208                              sha1_to_hex(item->object.sha1));
 209         }
 210         ret = parse_tree_buffer(item, buffer, size);
 211         free(buffer);
 212         return ret;
 213 }