update-index.c

   1 /*
   2  * GIT - The information manager from hell
   3  *
   4  * Copyright (C) Linus Torvalds, 2005
   5  */
   6 #include "cache.h"
   7 #include "strbuf.h"
   8
   9 /*
  10  * Default to not allowing changes to the list of files. The
  11  * tool doesn't actually care, but this makes it harder to add
  12  * files to the revision control by mistake by doing something
  13  * like "git-update-index *" and suddenly having all the object
  14  * files be revision controlled.
  15  */
  16 static int allow_add = 0, allow_remove = 0, allow_replace = 0, allow_unmerged = 0, not_new = 0, quiet = 0, info_only = 0;
  17 static int force_remove;
  18
  19 /* Three functions to allow overloaded pointer return; see linux/err.h */
  20 static inline void *ERR_PTR(long error)
  21 {
  22         return (void *) error;
  23 }
  24
  25 static inline long PTR_ERR(const void *ptr)
  26 {
  27         return (long) ptr;
  28 }
  29
  30 static inline long IS_ERR(const void *ptr)
  31 {
  32         return (unsigned long)ptr > (unsigned long)-1000L;
  33 }
  34
  35 static int add_file_to_cache(const char *path)
  36 {
  37         int size, namelen, option, status;
  38         struct cache_entry *ce;
  39         struct stat st;
  40
  41         status = lstat(path, &st);
  42         if (status < 0 || S_ISDIR(st.st_mode)) {
  43                 /* When we used to have "path" and now we want to add
  44                  * "path/file", we need a way to remove "path" before
  45                  * being able to add "path/file".  However,
  46                  * "git-update-index --remove path" would not work.
  47                  * --force-remove can be used but this is more user
  48                  * friendly, especially since we can do the opposite
  49                  * case just fine without --force-remove.
  50                  */
  51                 if (status == 0 || (errno == ENOENT || errno == ENOTDIR)) {
  52                         if (allow_remove) {
  53                                 if (remove_file_from_cache(path))
  54                                         return error("%s: cannot remove from the index",
  55                                                      path);
  56                                 else
  57                                         return 0;
  58                         } else if (status < 0) {
  59                                 return error("%s: does not exist and --remove not passed",
  60                                              path);
  61                         }
  62                 }
  63                 if (0 == status)
  64                         return error("%s: is a directory - add files inside instead",
  65                                      path);
  66                 else
  67                         return error("lstat(\"%s\"): %s", path,
  68                                      strerror(errno));
  69         }
  70         namelen = strlen(path);
  71         size = cache_entry_size(namelen);
  72         ce = xmalloc(size);
  73         memset(ce, 0, size);
  74         memcpy(ce->name, path, namelen);
  75         fill_stat_cache_info(ce, &st);
  76         ce->ce_mode = create_ce_mode(st.st_mode);
  77         ce->ce_flags = htons(namelen);
  78
  79         if (index_path(ce->sha1, path, &st, !info_only))
  80                 return -1;
  81         option = allow_add ? ADD_CACHE_OK_TO_ADD : 0;
  82         option |= allow_replace ? ADD_CACHE_OK_TO_REPLACE : 0;
  83         if (add_cache_entry(ce, option))
  84                 return error("%s: cannot add to the index - missing --add option?",
  85                              path);
  86         return 0;
  87 }
  88
  89 /*
  90  * "refresh" does not calculate a new sha1 file or bring the
  91  * cache up-to-date for mode/content changes. But what it
  92  * _does_ do is to "re-match" the stat information of a file
  93  * with the cache, so that you can refresh the cache for a
  94  * file that hasn't been changed but where the stat entry is
  95  * out of date.
  96  *
  97  * For example, you'd want to do this after doing a "git-read-tree",
  98  * to link up the stat cache details with the proper files.
  99  */
 100 static struct cache_entry *refresh_entry(struct cache_entry *ce)
 101 {
 102         struct stat st;
 103         struct cache_entry *updated;
 104         int changed, size;
 105
 106         if (lstat(ce->name, &st) < 0)
 107                 return ERR_PTR(-errno);
 108
 109         changed = ce_match_stat(ce, &st);
 110         if (!changed)
 111                 return NULL;
 112
 113         if (ce_modified(ce, &st))
 114                 return ERR_PTR(-EINVAL);
 115
 116         size = ce_size(ce);
 117         updated = xmalloc(size);
 118         memcpy(updated, ce, size);
 119         fill_stat_cache_info(updated, &st);
 120         return updated;
 121 }
 122
 123 static int refresh_cache(void)
 124 {
 125         int i;
 126         int has_errors = 0;
 127
 128         for (i = 0; i < active_nr; i++) {
 129                 struct cache_entry *ce, *new;
 130                 ce = active_cache[i];
 131                 if (ce_stage(ce)) {
 132                         while ((i < active_nr) &&
 133                                ! strcmp(active_cache[i]->name, ce->name))
 134                                 i++;
 135                         i--;
 136                         if (allow_unmerged)
 137                                 continue;
 138                         printf("%s: needs merge\n", ce->name);
 139                         has_errors = 1;
 140                         continue;
 141                 }
 142
 143                 new = refresh_entry(ce);
 144                 if (!new)
 145                         continue;
 146                 if (IS_ERR(new)) {
 147                         if (not_new && PTR_ERR(new) == -ENOENT)
 148                                 continue;
 149                         if (quiet)
 150                                 continue;
 151                         printf("%s: needs update\n", ce->name);
 152                         has_errors = 1;
 153                         continue;
 154                 }
 155                 active_cache_changed = 1;
 156                 /* You can NOT just free active_cache[i] here, since it
 157                  * might not be necessarily malloc()ed but can also come
 158                  * from mmap(). */
 159                 active_cache[i] = new;
 160         }
 161         return has_errors;
 162 }
 163
 164 /*
 165  * We fundamentally don't like some paths: we don't want
 166  * dot or dot-dot anywhere, and for obvious reasons don't
 167  * want to recurse into ".git" either.
 168  *
 169  * Also, we don't want double slashes or slashes at the
 170  * end that can make pathnames ambiguous.
 171  */
 172 static int verify_dotfile(const char *rest)
 173 {
 174         /*
 175          * The first character was '.', but that
 176          * has already been discarded, we now test
 177          * the rest.
 178          */
 179         switch (*rest) {
 180         /* "." is not allowed */
 181         case '\0': case '/':
 182                 return 0;
 183
 184         /*
 185          * ".git" followed by  NUL or slash is bad. This
 186          * shares the path end test with the ".." case.
 187          */
 188         case 'g':
 189                 if (rest[1] != 'i')
 190                         break;
 191                 if (rest[2] != 't')
 192                         break;
 193                 rest += 2;
 194         /* fallthrough */
 195         case '.':
 196                 if (rest[1] == '\0' || rest[1] == '/')
 197                         return 0;
 198         }
 199         return 1;
 200 }
 201
 202 static int verify_path(const char *path)
 203 {
 204         char c;
 205
 206         goto inside;
 207         for (;;) {
 208                 if (!c)
 209                         return 1;
 210                 if (c == '/') {
 211 inside:
 212                         c = *path++;
 213                         switch (c) {
 214                         default:
 215                                 continue;
 216                         case '/': case '\0':
 217                                 break;
 218                         case '.':
 219                                 if (verify_dotfile(path))
 220                                         continue;
 221                         }
 222                         return 0;
 223                 }
 224                 c = *path++;
 225         }
 226 }
 227
 228 static int add_cacheinfo(const char *arg1, const char *arg2, const char *arg3)
 229 {
 230         int size, len, option;
 231         unsigned int mode;
 232         unsigned char sha1[20];
 233         struct cache_entry *ce;
 234
 235         if (sscanf(arg1, "%o", &mode) != 1)
 236                 return -1;
 237         if (get_sha1_hex(arg2, sha1))
 238                 return -1;
 239         if (!verify_path(arg3))
 240                 return -1;
 241
 242         len = strlen(arg3);
 243         size = cache_entry_size(len);
 244         ce = xmalloc(size);
 245         memset(ce, 0, size);
 246
 247         memcpy(ce->sha1, sha1, 20);
 248         memcpy(ce->name, arg3, len);
 249         ce->ce_flags = htons(len);
 250         ce->ce_mode = create_ce_mode(mode);
 251         option = allow_add ? ADD_CACHE_OK_TO_ADD : 0;
 252         option |= allow_replace ? ADD_CACHE_OK_TO_REPLACE : 0;
 253         return add_cache_entry(ce, option);
 254 }
 255
 256 static struct cache_file cache_file;
 257
 258
 259 static void update_one(const char *path, const char *prefix, int prefix_length)
 260 {
 261         const char *p = prefix_path(prefix, prefix_length, path);
 262         if (!verify_path(p)) {
 263                 fprintf(stderr, "Ignoring path %s\n", path);
 264                 return;
 265         }
 266         if (force_remove) {
 267                 if (remove_file_from_cache(p))
 268                         die("git-update-index: unable to remove %s", path);
 269                 return;
 270         }
 271         if (add_file_to_cache(p))
 272                 die("Unable to process file %s", path);
 273 }
 274
 275 static void read_index_info(int line_termination)
 276 {
 277         struct strbuf buf;
 278         strbuf_init(&buf);
 279         while (1) {
 280                 char *ptr;
 281                 unsigned char sha1[20];
 282                 unsigned int mode;
 283
 284                 read_line(&buf, stdin, line_termination);
 285                 if (buf.eof)
 286                         break;
 287
 288                 mode = strtoul(buf.buf, &ptr, 8);
 289                 if (ptr == buf.buf || *ptr != ' ' ||
 290                     get_sha1_hex(ptr + 1, sha1) ||
 291                     ptr[41] != '\t')
 292                         goto bad_line;
 293
 294                 ptr += 42;
 295                 if (!verify_path(ptr)) {
 296                         fprintf(stderr, "Ignoring path %s\n", ptr);
 297                         continue;
 298                 }
 299
 300                 if (!mode) {
 301                         /* mode == 0 means there is no such path -- remove */
 302                         if (remove_file_from_cache(ptr))
 303                                 die("git-update-index: unable to remove %s",
 304                                     ptr);
 305                 }
 306                 else {
 307                         /* mode ' ' sha1 '\t' name
 308                          * ptr[-1] points at tab,
 309                          * ptr[-41] is at the beginning of sha1
 310                          */
 311                         ptr[-42] = ptr[-1] = 0;
 312                         if (add_cacheinfo(buf.buf, ptr-41, ptr))
 313                                 die("git-update-index: unable to update %s",
 314                                     ptr);
 315                 }
 316                 continue;
 317
 318         bad_line:
 319                 die("malformed index info %s", buf.buf);
 320         }
 321 }
 322
 323 int main(int argc, const char **argv)
 324 {
 325         int i, newfd, entries, has_errors = 0, line_termination = '\n';
 326         int allow_options = 1;
 327         int read_from_stdin = 0;
 328         const char *prefix = setup_git_directory();
 329         int prefix_length = prefix ? strlen(prefix) : 0;
 330
 331         newfd = hold_index_file_for_update(&cache_file, get_index_file());
 332         if (newfd < 0)
 333                 die("unable to create new cachefile");
 334
 335         entries = read_cache();
 336         if (entries < 0)
 337                 die("cache corrupted");
 338
 339         for (i = 1 ; i < argc; i++) {
 340                 const char *path = argv[i];
 341
 342                 if (allow_options && *path == '-') {
 343                         if (!strcmp(path, "--")) {
 344                                 allow_options = 0;
 345                                 continue;
 346                         }
 347                         if (!strcmp(path, "-q")) {
 348                                 quiet = 1;
 349                                 continue;
 350                         }
 351                         if (!strcmp(path, "--add")) {
 352                                 allow_add = 1;
 353                                 continue;
 354                         }
 355                         if (!strcmp(path, "--replace")) {
 356                                 allow_replace = 1;
 357                                 continue;
 358                         }
 359                         if (!strcmp(path, "--remove")) {
 360                                 allow_remove = 1;
 361                                 continue;
 362                         }
 363                         if (!strcmp(path, "--unmerged")) {
 364                                 allow_unmerged = 1;
 365                                 continue;
 366                         }
 367                         if (!strcmp(path, "--refresh")) {
 368                                 has_errors |= refresh_cache();
 369                                 continue;
 370                         }
 371                         if (!strcmp(path, "--cacheinfo")) {
 372                                 if (i+3 >= argc)
 373                                         die("git-update-index: --cacheinfo <mode> <sha1> <path>");
 374                                 if (add_cacheinfo(argv[i+1], argv[i+2], argv[i+3]))
 375                                         die("git-update-index: --cacheinfo cannot add %s", argv[i+3]);
 376                                 i += 3;
 377                                 continue;
 378                         }
 379                         if (!strcmp(path, "--info-only")) {
 380                                 info_only = 1;
 381                                 continue;
 382                         }
 383                         if (!strcmp(path, "--force-remove")) {
 384                                 force_remove = 1;
 385                                 continue;
 386                         }
 387                         if (!strcmp(path, "-z")) {
 388                                 line_termination = 0;
 389                                 continue;
 390                         }
 391                         if (!strcmp(path, "--stdin")) {
 392                                 if (i != argc - 1)
 393                                         die("--stdin must be at the end");
 394                                 read_from_stdin = 1;
 395                                 break;
 396                         }
 397                         if (!strcmp(path, "--index-info")) {
 398                                 allow_add = allow_replace = allow_remove = 1;
 399                                 read_index_info(line_termination);
 400                                 continue;
 401                         }
 402                         if (!strcmp(path, "--ignore-missing")) {
 403                                 not_new = 1;
 404                                 continue;
 405                         }
 406                         die("unknown option %s", path);
 407                 }
 408                 update_one(path, prefix, prefix_length);
 409         }
 410         if (read_from_stdin) {
 411                 struct strbuf buf;
 412                 strbuf_init(&buf);
 413                 while (1) {
 414                         read_line(&buf, stdin, line_termination);
 415                         if (buf.eof)
 416                                 break;
 417                         update_one(buf.buf, prefix, prefix_length);
 418                 }
 419         }
 420         if (active_cache_changed) {
 421                 if (write_cache(newfd, active_cache, active_nr) ||
 422                     commit_index_file(&cache_file))
 423                         die("Unable to write new cachefile");
 424         }
 425
 426         return has_errors ? 1 : 0;
 427 }