builtin/rm.c

   1 /*
   2  * "git rm" builtin command
   3  *
   4  * Copyright (C) Linus Torvalds 2006
   5  */
   6 #include "cache.h"
   7 #include "builtin.h"
   8 #include "dir.h"
   9 #include "cache-tree.h"
  10 #include "tree-walk.h"
  11 #include "parse-options.h"
  12 #include "string-list.h"
  13 #include "submodule.h"
  14
  15 static const char * const builtin_rm_usage[] = {
  16         N_("git rm [options] [--] <file>..."),
  17         NULL
  18 };
  19
  20 static struct {
  21         int nr, alloc;
  22         struct {
  23                 const char *name;
  24                 char is_submodule;
  25         } *entry;
  26 } list;
  27
  28 static int get_ours_cache_pos(const char *path, int pos)
  29 {
  30         int i = -pos - 1;
  31
  32         while ((i < active_nr) && !strcmp(active_cache[i]->name, path)) {
  33                 if (ce_stage(active_cache[i]) == 2)
  34                         return i;
  35                 i++;
  36         }
  37         return -1;
  38 }
  39
  40 static void print_error_files(struct string_list *files_list,
  41                               const char *main_msg,
  42                               const char *hints_msg,
  43                               int *errs)
  44 {
  45         if (files_list->nr) {
  46                 int i;
  47                 struct strbuf err_msg = STRBUF_INIT;
  48
  49                 strbuf_addstr(&err_msg, main_msg);
  50                 for (i = 0; i < files_list->nr; i++)
  51                         strbuf_addf(&err_msg,
  52                                     "\n    %s",
  53                                     files_list->items[i].string);
  54                 if (advice_rm_hints)
  55                         strbuf_addstr(&err_msg, hints_msg);
  56                 *errs = error("%s", err_msg.buf);
  57                 strbuf_release(&err_msg);
  58         }
  59 }
  60
  61 static int check_submodules_use_gitfiles(void)
  62 {
  63         int i;
  64         int errs = 0;
  65         struct string_list files = STRING_LIST_INIT_NODUP;
  66
  67         for (i = 0; i < list.nr; i++) {
  68                 const char *name = list.entry[i].name;
  69                 int pos;
  70                 struct cache_entry *ce;
  71                 struct stat st;
  72
  73                 pos = cache_name_pos(name, strlen(name));
  74                 if (pos < 0) {
  75                         pos = get_ours_cache_pos(name, pos);
  76                         if (pos < 0)
  77                                 continue;
  78                 }
  79                 ce = active_cache[pos];
  80
  81                 if (!S_ISGITLINK(ce->ce_mode) ||
  82                     (lstat(ce->name, &st) < 0) ||
  83                     is_empty_dir(name))
  84                         continue;
  85
  86                 if (!submodule_uses_gitfile(name))
  87                         string_list_append(&files, name);
  88         }
  89         print_error_files(&files,
  90                           Q_("the following submodule (or one of its nested "
  91                              "submodules)\n uses a .git directory:",
  92                              "the following submodules (or one of its nested "
  93                              "submodules)\n use a .git directory:",
  94                              files.nr),
  95                           _("\n(use 'rm -rf' if you really want to remove "
  96                             "it including all of its history)"),
  97                           &errs);
  98         string_list_clear(&files, 0);
  99
 100         return errs;
 101 }
 102
 103 static int check_local_mod(unsigned char *head, int index_only)
 104 {
 105         /*
 106          * Items in list are already sorted in the cache order,
 107          * so we could do this a lot more efficiently by using
 108          * tree_desc based traversal if we wanted to, but I am
 109          * lazy, and who cares if removal of files is a tad
 110          * slower than the theoretical maximum speed?
 111          */
 112         int i, no_head;
 113         int errs = 0;
 114         struct string_list files_staged = STRING_LIST_INIT_NODUP;
 115         struct string_list files_cached = STRING_LIST_INIT_NODUP;
 116         struct string_list files_submodule = STRING_LIST_INIT_NODUP;
 117         struct string_list files_local = STRING_LIST_INIT_NODUP;
 118
 119         no_head = is_null_sha1(head);
 120         for (i = 0; i < list.nr; i++) {
 121                 struct stat st;
 122                 int pos;
 123                 struct cache_entry *ce;
 124                 const char *name = list.entry[i].name;
 125                 unsigned char sha1[20];
 126                 unsigned mode;
 127                 int local_changes = 0;
 128                 int staged_changes = 0;
 129
 130                 pos = cache_name_pos(name, strlen(name));
 131                 if (pos < 0) {
 132                         /*
 133                          * Skip unmerged entries except for populated submodules
 134                          * that could lose history when removed.
 135                          */
 136                         pos = get_ours_cache_pos(name, pos);
 137                         if (pos < 0)
 138                                 continue;
 139
 140                         if (!S_ISGITLINK(active_cache[pos]->ce_mode) ||
 141                             is_empty_dir(name))
 142                                 continue;
 143                 }
 144                 ce = active_cache[pos];
 145
 146                 if (lstat(ce->name, &st) < 0) {
 147                         if (errno != ENOENT && errno != ENOTDIR)
 148                                 warning("'%s': %s", ce->name, strerror(errno));
 149                         /* It already vanished from the working tree */
 150                         continue;
 151                 }
 152                 else if (S_ISDIR(st.st_mode)) {
 153                         /* if a file was removed and it is now a
 154                          * directory, that is the same as ENOENT as
 155                          * far as git is concerned; we do not track
 156                          * directories unless they are submodules.
 157                          */
 158                         if (!S_ISGITLINK(ce->ce_mode))
 159                                 continue;
 160                 }
 161
 162                 /*
 163                  * "rm" of a path that has changes need to be treated
 164                  * carefully not to allow losing local changes
 165                  * accidentally.  A local change could be (1) file in
 166                  * work tree is different since the index; and/or (2)
 167                  * the user staged a content that is different from
 168                  * the current commit in the index.
 169                  *
 170                  * In such a case, you would need to --force the
 171                  * removal.  However, "rm --cached" (remove only from
 172                  * the index) is safe if the index matches the file in
 173                  * the work tree or the HEAD commit, as it means that
 174                  * the content being removed is available elsewhere.
 175                  */
 176
 177                 /*
 178                  * Is the index different from the file in the work tree?
 179                  * If it's a submodule, is its work tree modified?
 180                  */
 181                 if (ce_match_stat(ce, &st, 0) ||
 182                     (S_ISGITLINK(ce->ce_mode) &&
 183                      !ok_to_remove_submodule(ce->name)))
 184                         local_changes = 1;
 185
 186                 /*
 187                  * Is the index different from the HEAD commit?  By
 188                  * definition, before the very initial commit,
 189                  * anything staged in the index is treated by the same
 190                  * way as changed from the HEAD.
 191                  */
 192                 if (no_head
 193                      || get_tree_entry(head, name, sha1, &mode)
 194                      || ce->ce_mode != create_ce_mode(mode)
 195                      || hashcmp(ce->sha1, sha1))
 196                         staged_changes = 1;
 197
 198                 /*
 199                  * If the index does not match the file in the work
 200                  * tree and if it does not match the HEAD commit
 201                  * either, (1) "git rm" without --cached definitely
 202                  * will lose information; (2) "git rm --cached" will
 203                  * lose information unless it is about removing an
 204                  * "intent to add" entry.
 205                  */
 206                 if (local_changes && staged_changes) {
 207                         if (!index_only || !(ce->ce_flags & CE_INTENT_TO_ADD))
 208                                 string_list_append(&files_staged, name);
 209                 }
 210                 else if (!index_only) {
 211                         if (staged_changes)
 212                                 string_list_append(&files_cached, name);
 213                         if (local_changes) {
 214                                 if (S_ISGITLINK(ce->ce_mode) &&
 215                                     !submodule_uses_gitfile(name))
 216                                         string_list_append(&files_submodule, name);
 217                                 else
 218                                         string_list_append(&files_local, name);
 219                         }
 220                 }
 221         }
 222         print_error_files(&files_staged,
 223                           Q_("the following file has staged content different "
 224                              "from both the\nfile and the HEAD:",
 225                              "the following files have staged content different"
 226                              " from both the\nfile and the HEAD:",
 227                              files_staged.nr),
 228                           _("\n(use -f to force removal)"),
 229                           &errs);
 230         string_list_clear(&files_staged, 0);
 231         print_error_files(&files_cached,
 232                           Q_("the following file has changes "
 233                              "staged in the index:",
 234                              "the following files have changes "
 235                              "staged in the index:", files_cached.nr),
 236                           _("\n(use --cached to keep the file,"
 237                             " or -f to force removal)"),
 238                           &errs);
 239         string_list_clear(&files_cached, 0);
 240         print_error_files(&files_submodule,
 241                           Q_("the following submodule (or one of its nested "
 242                              "submodule)\nuses a .git directory:",
 243                              "the following submodules (or one of its nested "
 244                              "submodule)\nuse a .git directory:",
 245                              files_submodule.nr),
 246                           _("\n(use 'rm -rf' if you really "
 247                             "want to remove it including all "
 248                             "of its history)"),
 249                           &errs);
 250         string_list_clear(&files_submodule, 0);
 251         print_error_files(&files_local,
 252                           Q_("the following file has local modifications:",
 253                              "the following files have local modifications:",
 254                              files_local.nr),
 255                           _("\n(use --cached to keep the file,"
 256                             " or -f to force removal)"),
 257                           &errs);
 258         string_list_clear(&files_local, 0);
 259
 260         return errs;
 261 }
 262
 263 static struct lock_file lock_file;
 264
 265 static int show_only = 0, force = 0, index_only = 0, recursive = 0, quiet = 0;
 266 static int ignore_unmatch = 0;
 267
 268 static struct option builtin_rm_options[] = {
 269         OPT__DRY_RUN(&show_only, N_("dry run")),
 270         OPT__QUIET(&quiet, N_("do not list removed files")),
 271         OPT_BOOLEAN( 0 , "cached",         &index_only, N_("only remove from the index")),
 272         OPT__FORCE(&force, N_("override the up-to-date check")),
 273         OPT_BOOLEAN('r', NULL,             &recursive,  N_("allow recursive removal")),
 274         OPT_BOOLEAN( 0 , "ignore-unmatch", &ignore_unmatch,
 275                                 N_("exit with a zero status even if nothing matched")),
 276         OPT_END(),
 277 };
 278
 279 int cmd_rm(int argc, const char **argv, const char *prefix)
 280 {
 281         int i, newfd;
 282         const char **pathspec;
 283         char *seen;
 284
 285         git_config(git_default_config, NULL);
 286
 287         argc = parse_options(argc, argv, prefix, builtin_rm_options,
 288                              builtin_rm_usage, 0);
 289         if (!argc)
 290                 usage_with_options(builtin_rm_usage, builtin_rm_options);
 291
 292         if (!index_only)
 293                 setup_work_tree();
 294
 295         newfd = hold_locked_index(&lock_file, 1);
 296
 297         if (read_cache() < 0)
 298                 die(_("index file corrupt"));
 299
 300         /*
 301          * Drop trailing directory separators from directories so we'll find
 302          * submodules in the index.
 303          */
 304         for (i = 0; i < argc; i++) {
 305                 size_t pathlen = strlen(argv[i]);
 306                 if (pathlen && is_dir_sep(argv[i][pathlen - 1]) &&
 307                     is_directory(argv[i])) {
 308                         do {
 309                                 pathlen--;
 310                         } while (pathlen && is_dir_sep(argv[i][pathlen - 1]));
 311                         argv[i] = xmemdupz(argv[i], pathlen);
 312                 }
 313         }
 314
 315         pathspec = get_pathspec(prefix, argv);
 316         refresh_index(&the_index, REFRESH_QUIET, pathspec, NULL, NULL);
 317
 318         seen = NULL;
 319         for (i = 0; pathspec[i] ; i++)
 320                 /* nothing */;
 321         seen = xcalloc(i, 1);
 322
 323         for (i = 0; i < active_nr; i++) {
 324                 struct cache_entry *ce = active_cache[i];
 325                 if (!match_pathspec(pathspec, ce->name, ce_namelen(ce), 0, seen))
 326                         continue;
 327                 ALLOC_GROW(list.entry, list.nr + 1, list.alloc);
 328                 list.entry[list.nr].name = ce->name;
 329                 list.entry[list.nr++].is_submodule = S_ISGITLINK(ce->ce_mode);
 330         }
 331
 332         if (pathspec) {
 333                 const char *match;
 334                 int seen_any = 0;
 335                 for (i = 0; (match = pathspec[i]) != NULL ; i++) {
 336                         if (!seen[i]) {
 337                                 if (!ignore_unmatch) {
 338                                         die(_("pathspec '%s' did not match any files"),
 339                                             match);
 340                                 }
 341                         }
 342                         else {
 343                                 seen_any = 1;
 344                         }
 345                         if (!recursive && seen[i] == MATCHED_RECURSIVELY)
 346                                 die(_("not removing '%s' recursively without -r"),
 347                                     *match ? match : ".");
 348                 }
 349
 350                 if (! seen_any)
 351                         exit(0);
 352         }
 353
 354         /*
 355          * If not forced, the file, the index and the HEAD (if exists)
 356          * must match; but the file can already been removed, since
 357          * this sequence is a natural "novice" way:
 358          *
 359          *      rm F; git rm F
 360          *
 361          * Further, if HEAD commit exists, "diff-index --cached" must
 362          * report no changes unless forced.
 363          */
 364         if (!force) {
 365                 unsigned char sha1[20];
 366                 if (get_sha1("HEAD", sha1))
 367                         hashclr(sha1);
 368                 if (check_local_mod(sha1, index_only))
 369                         exit(1);
 370         } else if (!index_only) {
 371                 if (check_submodules_use_gitfiles())
 372                         exit(1);
 373         }
 374
 375         /*
 376          * First remove the names from the index: we won't commit
 377          * the index unless all of them succeed.
 378          */
 379         for (i = 0; i < list.nr; i++) {
 380                 const char *path = list.entry[i].name;
 381                 if (!quiet)
 382                         printf("rm '%s'\n", path);
 383
 384                 if (remove_file_from_cache(path))
 385                         die(_("git rm: unable to remove %s"), path);
 386         }
 387
 388         if (show_only)
 389                 return 0;
 390
 391         /*
 392          * Then, unless we used "--cached", remove the filenames from
 393          * the workspace. If we fail to remove the first one, we
 394          * abort the "git rm" (but once we've successfully removed
 395          * any file at all, we'll go ahead and commit to it all:
 396          * by then we've already committed ourselves and can't fail
 397          * in the middle)
 398          */
 399         if (!index_only) {
 400                 int removed = 0;
 401                 for (i = 0; i < list.nr; i++) {
 402                         const char *path = list.entry[i].name;
 403                         if (list.entry[i].is_submodule) {
 404                                 if (is_empty_dir(path)) {
 405                                         if (!rmdir(path)) {
 406                                                 removed = 1;
 407                                                 continue;
 408                                         }
 409                                 } else {
 410                                         struct strbuf buf = STRBUF_INIT;
 411                                         strbuf_addstr(&buf, path);
 412                                         if (!remove_dir_recursively(&buf, 0)) {
 413                                                 removed = 1;
 414                                                 strbuf_release(&buf);
 415                                                 continue;
 416                                         }
 417                                         strbuf_release(&buf);
 418                                         /* Fallthrough and let remove_path() fail. */
 419                                 }
 420                         }
 421                         if (!remove_path(path)) {
 422                                 removed = 1;
 423                                 continue;
 424                         }
 425                         if (!removed)
 426                                 die_errno("git rm: '%s'", path);
 427                 }
 428         }
 429
 430         if (active_cache_changed) {
 431                 if (write_cache(newfd, active_cache, active_nr) ||
 432                     commit_locked_index(&lock_file))
 433                         die(_("Unable to write new index file"));
 434         }
 435
 436         return 0;
 437 }