builtin/rm.c

   1 /*
   2  * "git rm" builtin command
   3  *
   4  * Copyright (C) Linus Torvalds 2006
   5  */
   6 #define USE_THE_INDEX_VARIABLE
   7 #include "builtin.h"
   8 #include "advice.h"
   9 #include "config.h"
  10 #include "lockfile.h"
  11 #include "dir.h"
  12 #include "gettext.h"
  13 #include "hash.h"
  14 #include "tree-walk.h"
  15 #include "object-name.h"
  16 #include "parse-options.h"
  17 #include "read-cache.h"
  18 #include "repository.h"
  19 #include "string-list.h"
  20 #include "setup.h"
  21 #include "sparse-index.h"
  22 #include "submodule.h"
  23 #include "pathspec.h"
  24
  25 static const char * const builtin_rm_usage[] = {
  26         N_("git rm [-f | --force] [-n] [-r] [--cached] [--ignore-unmatch]\n"
  27            "       [--quiet] [--pathspec-from-file=<file> [--pathspec-file-nul]]\n"
  28            "       [--] [<pathspec>...]"),
  29         NULL
  30 };
  31
  32 static struct {
  33         int nr, alloc;
  34         struct {
  35                 const char *name;
  36                 char is_submodule;
  37         } *entry;
  38 } list;
  39
  40 static int get_ours_cache_pos(const char *path, int pos)
  41 {
  42         int i = -pos - 1;
  43
  44         while ((i < the_index.cache_nr) && !strcmp(the_index.cache[i]->name, path)) {
  45                 if (ce_stage(the_index.cache[i]) == 2)
  46                         return i;
  47                 i++;
  48         }
  49         return -1;
  50 }
  51
  52 static void print_error_files(struct string_list *files_list,
  53                               const char *main_msg,
  54                               const char *hints_msg,
  55                               int *errs)
  56 {
  57         if (files_list->nr) {
  58                 int i;
  59                 struct strbuf err_msg = STRBUF_INIT;
  60
  61                 strbuf_addstr(&err_msg, main_msg);
  62                 for (i = 0; i < files_list->nr; i++)
  63                         strbuf_addf(&err_msg,
  64                                     "\n    %s",
  65                                     files_list->items[i].string);
  66                 if (advice_enabled(ADVICE_RM_HINTS))
  67                         strbuf_addstr(&err_msg, hints_msg);
  68                 *errs = error("%s", err_msg.buf);
  69                 strbuf_release(&err_msg);
  70         }
  71 }
  72
  73 static void submodules_absorb_gitdir_if_needed(void)
  74 {
  75         int i;
  76         for (i = 0; i < list.nr; i++) {
  77                 const char *name = list.entry[i].name;
  78                 int pos;
  79                 const struct cache_entry *ce;
  80
  81                 pos = index_name_pos(&the_index, name, strlen(name));
  82                 if (pos < 0) {
  83                         pos = get_ours_cache_pos(name, pos);
  84                         if (pos < 0)
  85                                 continue;
  86                 }
  87                 ce = the_index.cache[pos];
  88
  89                 if (!S_ISGITLINK(ce->ce_mode) ||
  90                     !file_exists(ce->name) ||
  91                     is_empty_dir(name))
  92                         continue;
  93
  94                 if (!submodule_uses_gitfile(name))
  95                         absorb_git_dir_into_superproject(name, NULL);
  96         }
  97 }
  98
  99 static int check_local_mod(struct object_id *head, int index_only)
 100 {
 101         /*
 102          * Items in list are already sorted in the cache order,
 103          * so we could do this a lot more efficiently by using
 104          * tree_desc based traversal if we wanted to, but I am
 105          * lazy, and who cares if removal of files is a tad
 106          * slower than the theoretical maximum speed?
 107          */
 108         int i, no_head;
 109         int errs = 0;
 110         struct string_list files_staged = STRING_LIST_INIT_NODUP;
 111         struct string_list files_cached = STRING_LIST_INIT_NODUP;
 112         struct string_list files_local = STRING_LIST_INIT_NODUP;
 113
 114         no_head = is_null_oid(head);
 115         for (i = 0; i < list.nr; i++) {
 116                 struct stat st;
 117                 int pos;
 118                 const struct cache_entry *ce;
 119                 const char *name = list.entry[i].name;
 120                 struct object_id oid;
 121                 unsigned short mode;
 122                 int local_changes = 0;
 123                 int staged_changes = 0;
 124
 125                 pos = index_name_pos(&the_index, name, strlen(name));
 126                 if (pos < 0) {
 127                         /*
 128                          * Skip unmerged entries except for populated submodules
 129                          * that could lose history when removed.
 130                          */
 131                         pos = get_ours_cache_pos(name, pos);
 132                         if (pos < 0)
 133                                 continue;
 134
 135                         if (!S_ISGITLINK(the_index.cache[pos]->ce_mode) ||
 136                             is_empty_dir(name))
 137                                 continue;
 138                 }
 139                 ce = the_index.cache[pos];
 140
 141                 if (lstat(ce->name, &st) < 0) {
 142                         if (!is_missing_file_error(errno))
 143                                 warning_errno(_("failed to stat '%s'"), ce->name);
 144                         /* It already vanished from the working tree */
 145                         continue;
 146                 }
 147                 else if (S_ISDIR(st.st_mode)) {
 148                         /* if a file was removed and it is now a
 149                          * directory, that is the same as ENOENT as
 150                          * far as git is concerned; we do not track
 151                          * directories unless they are submodules.
 152                          */
 153                         if (!S_ISGITLINK(ce->ce_mode))
 154                                 continue;
 155                 }
 156
 157                 /*
 158                  * "rm" of a path that has changes need to be treated
 159                  * carefully not to allow losing local changes
 160                  * accidentally.  A local change could be (1) file in
 161                  * work tree is different since the index; and/or (2)
 162                  * the user staged a content that is different from
 163                  * the current commit in the index.
 164                  *
 165                  * In such a case, you would need to --force the
 166                  * removal.  However, "rm --cached" (remove only from
 167                  * the index) is safe if the index matches the file in
 168                  * the work tree or the HEAD commit, as it means that
 169                  * the content being removed is available elsewhere.
 170                  */
 171
 172                 /*
 173                  * Is the index different from the file in the work tree?
 174                  * If it's a submodule, is its work tree modified?
 175                  */
 176                 if (ie_match_stat(&the_index, ce, &st, 0) ||
 177                     (S_ISGITLINK(ce->ce_mode) &&
 178                      bad_to_remove_submodule(ce->name,
 179                                 SUBMODULE_REMOVAL_DIE_ON_ERROR |
 180                                 SUBMODULE_REMOVAL_IGNORE_IGNORED_UNTRACKED)))
 181                         local_changes = 1;
 182
 183                 /*
 184                  * Is the index different from the HEAD commit?  By
 185                  * definition, before the very initial commit,
 186                  * anything staged in the index is treated by the same
 187                  * way as changed from the HEAD.
 188                  */
 189                 if (no_head
 190                      || get_tree_entry(the_repository, head, name, &oid, &mode)
 191                      || ce->ce_mode != create_ce_mode(mode)
 192                      || !oideq(&ce->oid, &oid))
 193                         staged_changes = 1;
 194
 195                 /*
 196                  * If the index does not match the file in the work
 197                  * tree and if it does not match the HEAD commit
 198                  * either, (1) "git rm" without --cached definitely
 199                  * will lose information; (2) "git rm --cached" will
 200                  * lose information unless it is about removing an
 201                  * "intent to add" entry.
 202                  */
 203                 if (local_changes && staged_changes) {
 204                         if (!index_only || !ce_intent_to_add(ce))
 205                                 string_list_append(&files_staged, name);
 206                 }
 207                 else if (!index_only) {
 208                         if (staged_changes)
 209                                 string_list_append(&files_cached, name);
 210                         if (local_changes)
 211                                 string_list_append(&files_local, name);
 212                 }
 213         }
 214         print_error_files(&files_staged,
 215                           Q_("the following file has staged content different "
 216                              "from both the\nfile and the HEAD:",
 217                              "the following files have staged content different"
 218                              " from both the\nfile and the HEAD:",
 219                              files_staged.nr),
 220                           _("\n(use -f to force removal)"),
 221                           &errs);
 222         string_list_clear(&files_staged, 0);
 223         print_error_files(&files_cached,
 224                           Q_("the following file has changes "
 225                              "staged in the index:",
 226                              "the following files have changes "
 227                              "staged in the index:", files_cached.nr),
 228                           _("\n(use --cached to keep the file,"
 229                             " or -f to force removal)"),
 230                           &errs);
 231         string_list_clear(&files_cached, 0);
 232
 233         print_error_files(&files_local,
 234                           Q_("the following file has local modifications:",
 235                              "the following files have local modifications:",
 236                              files_local.nr),
 237                           _("\n(use --cached to keep the file,"
 238                             " or -f to force removal)"),
 239                           &errs);
 240         string_list_clear(&files_local, 0);
 241
 242         return errs;
 243 }
 244
 245 static int show_only = 0, force = 0, index_only = 0, recursive = 0, quiet = 0;
 246 static int ignore_unmatch = 0, pathspec_file_nul;
 247 static int include_sparse;
 248 static char *pathspec_from_file;
 249
 250 static struct option builtin_rm_options[] = {
 251         OPT__DRY_RUN(&show_only, N_("dry run")),
 252         OPT__QUIET(&quiet, N_("do not list removed files")),
 253         OPT_BOOL( 0 , "cached",         &index_only, N_("only remove from the index")),
 254         OPT__FORCE(&force, N_("override the up-to-date check"), PARSE_OPT_NOCOMPLETE),
 255         OPT_BOOL('r', NULL,             &recursive,  N_("allow recursive removal")),
 256         OPT_BOOL( 0 , "ignore-unmatch", &ignore_unmatch,
 257                                 N_("exit with a zero status even if nothing matched")),
 258         OPT_BOOL(0, "sparse", &include_sparse, N_("allow updating entries outside of the sparse-checkout cone")),
 259         OPT_PATHSPEC_FROM_FILE(&pathspec_from_file),
 260         OPT_PATHSPEC_FILE_NUL(&pathspec_file_nul),
 261         OPT_END(),
 262 };
 263
 264 int cmd_rm(int argc, const char **argv, const char *prefix)
 265 {
 266         struct lock_file lock_file = LOCK_INIT;
 267         int i, ret = 0;
 268         struct pathspec pathspec;
 269         char *seen;
 270
 271         git_config(git_default_config, NULL);
 272
 273         argc = parse_options(argc, argv, prefix, builtin_rm_options,
 274                              builtin_rm_usage, 0);
 275
 276         parse_pathspec(&pathspec, 0,
 277                        PATHSPEC_PREFER_CWD,
 278                        prefix, argv);
 279
 280         if (pathspec_from_file) {
 281                 if (pathspec.nr)
 282                         die(_("'%s' and pathspec arguments cannot be used together"), "--pathspec-from-file");
 283
 284                 parse_pathspec_file(&pathspec, 0,
 285                                     PATHSPEC_PREFER_CWD,
 286                                     prefix, pathspec_from_file, pathspec_file_nul);
 287         } else if (pathspec_file_nul) {
 288                 die(_("the option '%s' requires '%s'"), "--pathspec-file-nul", "--pathspec-from-file");
 289         }
 290
 291         if (!pathspec.nr)
 292                 die(_("No pathspec was given. Which files should I remove?"));
 293
 294         if (!index_only)
 295                 setup_work_tree();
 296
 297         prepare_repo_settings(the_repository);
 298         the_repository->settings.command_requires_full_index = 0;
 299         repo_hold_locked_index(the_repository, &lock_file, LOCK_DIE_ON_ERROR);
 300
 301         if (repo_read_index(the_repository) < 0)
 302                 die(_("index file corrupt"));
 303
 304         refresh_index(&the_index, REFRESH_QUIET|REFRESH_UNMERGED, &pathspec, NULL, NULL);
 305
 306         seen = xcalloc(pathspec.nr, 1);
 307
 308         if (pathspec_needs_expanded_index(&the_index, &pathspec))
 309                 ensure_full_index(&the_index);
 310
 311         for (i = 0; i < the_index.cache_nr; i++) {
 312                 const struct cache_entry *ce = the_index.cache[i];
 313
 314                 if (!include_sparse &&
 315                     (ce_skip_worktree(ce) ||
 316                      !path_in_sparse_checkout(ce->name, &the_index)))
 317                         continue;
 318                 if (!ce_path_match(&the_index, ce, &pathspec, seen))
 319                         continue;
 320                 ALLOC_GROW(list.entry, list.nr + 1, list.alloc);
 321                 list.entry[list.nr].name = xstrdup(ce->name);
 322                 list.entry[list.nr].is_submodule = S_ISGITLINK(ce->ce_mode);
 323                 if (list.entry[list.nr++].is_submodule &&
 324                     !is_staging_gitmodules_ok(&the_index))
 325                         die(_("please stage your changes to .gitmodules or stash them to proceed"));
 326         }
 327
 328         if (pathspec.nr) {
 329                 const char *original;
 330                 int seen_any = 0;
 331                 char *skip_worktree_seen = NULL;
 332                 struct string_list only_match_skip_worktree = STRING_LIST_INIT_NODUP;
 333
 334                 for (i = 0; i < pathspec.nr; i++) {
 335                         original = pathspec.items[i].original;
 336                         if (seen[i])
 337                                 seen_any = 1;
 338                         else if (ignore_unmatch)
 339                                 continue;
 340                         else if (!include_sparse &&
 341                                  matches_skip_worktree(&pathspec, i, &skip_worktree_seen))
 342                                 string_list_append(&only_match_skip_worktree, original);
 343                         else
 344                                 die(_("pathspec '%s' did not match any files"), original);
 345
 346                         if (!recursive && seen[i] == MATCHED_RECURSIVELY)
 347                                 die(_("not removing '%s' recursively without -r"),
 348                                     *original ? original : ".");
 349                 }
 350
 351                 if (only_match_skip_worktree.nr) {
 352                         advise_on_updating_sparse_paths(&only_match_skip_worktree);
 353                         ret = 1;
 354                 }
 355                 free(skip_worktree_seen);
 356                 string_list_clear(&only_match_skip_worktree, 0);
 357
 358                 if (!seen_any)
 359                         exit(ret);
 360         }
 361         clear_pathspec(&pathspec);
 362         free(seen);
 363
 364         if (!index_only)
 365                 submodules_absorb_gitdir_if_needed();
 366
 367         /*
 368          * If not forced, the file, the index and the HEAD (if exists)
 369          * must match; but the file can already been removed, since
 370          * this sequence is a natural "novice" way:
 371          *
 372          *      rm F; git rm F
 373          *
 374          * Further, if HEAD commit exists, "diff-index --cached" must
 375          * report no changes unless forced.
 376          */
 377         if (!force) {
 378                 struct object_id oid;
 379                 if (repo_get_oid(the_repository, "HEAD", &oid))
 380                         oidclr(&oid);
 381                 if (check_local_mod(&oid, index_only))
 382                         exit(1);
 383         }
 384
 385         /*
 386          * First remove the names from the index: we won't commit
 387          * the index unless all of them succeed.
 388          */
 389         for (i = 0; i < list.nr; i++) {
 390                 const char *path = list.entry[i].name;
 391                 if (!quiet)
 392                         printf("rm '%s'\n", path);
 393
 394                 if (remove_file_from_index(&the_index, path))
 395                         die(_("git rm: unable to remove %s"), path);
 396         }
 397
 398         if (show_only)
 399                 return 0;
 400
 401         /*
 402          * Then, unless we used "--cached", remove the filenames from
 403          * the workspace. If we fail to remove the first one, we
 404          * abort the "git rm" (but once we've successfully removed
 405          * any file at all, we'll go ahead and commit to it all:
 406          * by then we've already committed ourselves and can't fail
 407          * in the middle)
 408          */
 409         if (!index_only) {
 410                 int removed = 0, gitmodules_modified = 0;
 411                 struct strbuf buf = STRBUF_INIT;
 412                 int flag = force ? REMOVE_DIR_PURGE_ORIGINAL_CWD : 0;
 413                 for (i = 0; i < list.nr; i++) {
 414                         const char *path = list.entry[i].name;
 415                         if (list.entry[i].is_submodule) {
 416                                 strbuf_reset(&buf);
 417                                 strbuf_addstr(&buf, path);
 418                                 if (remove_dir_recursively(&buf, flag))
 419                                         die(_("could not remove '%s'"), path);
 420
 421                                 removed = 1;
 422                                 if (!remove_path_from_gitmodules(path))
 423                                         gitmodules_modified = 1;
 424                                 continue;
 425                         }
 426                         if (!remove_path(path)) {
 427                                 removed = 1;
 428                                 continue;
 429                         }
 430                         if (!removed)
 431                                 die_errno("git rm: '%s'", path);
 432                 }
 433                 strbuf_release(&buf);
 434                 if (gitmodules_modified)
 435                         stage_updated_gitmodules(&the_index);
 436         }
 437
 438         if (write_locked_index(&the_index, &lock_file,
 439                                COMMIT_LOCK | SKIP_IF_UNCHANGED))
 440                 die(_("Unable to write new index file"));
 441
 442         return ret;
 443 }