Andrew's git - gitweb.git/blob

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