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