builtin/rm.c

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