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