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                                 warning("'%s': %s", ce->name, strerror(errno));
  63                         /* It already vanished from the working tree */
  64                         continue;
  65                 }
  66                 else if (S_ISDIR(st.st_mode)) {
  67                         /* if a file was removed and it is now a
  68                          * directory, that is the same as ENOENT as
  69                          * far as git is concerned; we do not track
  70                          * directories.
  71                          */
  72                         continue;
  73                 }
  74
  75                 /*
  76                  * "rm" of a path that has changes need to be treated
  77                  * carefully not to allow losing local changes
  78                  * accidentally.  A local change could be (1) file in
  79                  * work tree is different since the index; and/or (2)
  80                  * the user staged a content that is different from
  81                  * the current commit in the index.
  82                  *
  83                  * In such a case, you would need to --force the
  84                  * removal.  However, "rm --cached" (remove only from
  85                  * the index) is safe if the index matches the file in
  86                  * the work tree or the HEAD commit, as it means that
  87                  * the content being removed is available elsewhere.
  88                  */
  89
  90                 /*
  91                  * Is the index different from the file in the work tree?
  92                  */
  93                 if (ce_match_stat(ce, &st, 0))
  94                         local_changes = 1;
  95
  96                 /*
  97                  * Is the index different from the HEAD commit?  By
  98                  * definition, before the very initial commit,
  99                  * anything staged in the index is treated by the same
 100                  * way as changed from the HEAD.
 101                  */
 102                 if (no_head
 103                      || get_tree_entry(head, name, sha1, &mode)
 104                      || ce->ce_mode != create_ce_mode(mode)
 105                      || hashcmp(ce->sha1, sha1))
 106                         staged_changes = 1;
 107
 108                 /*
 109                  * If the index does not match the file in the work
 110                  * tree and if it does not match the HEAD commit
 111                  * either, (1) "git rm" without --cached definitely
 112                  * will lose information; (2) "git rm --cached" will
 113                  * lose information unless it is about removing an
 114                  * "intent to add" entry.
 115                  */
 116                 if (local_changes && staged_changes) {
 117                         if (!index_only || !(ce->ce_flags & CE_INTENT_TO_ADD))
 118                                 errs = error("'%s' has staged content different "
 119                                              "from both the file and the HEAD\n"
 120                                              "(use -f to force removal)", name);
 121                 }
 122                 else if (!index_only) {
 123                         if (staged_changes)
 124                                 errs = error("'%s' has changes staged in the index\n"
 125                                              "(use --cached to keep the file, "
 126                                              "or -f to force removal)", name);
 127                         if (local_changes)
 128                                 errs = error("'%s' has local modifications\n"
 129                                              "(use --cached to keep the file, "
 130                                              "or -f to force removal)", name);
 131                 }
 132         }
 133         return errs;
 134 }
 135
 136 static struct lock_file lock_file;
 137
 138 static int show_only = 0, force = 0, index_only = 0, recursive = 0, quiet = 0;
 139 static int ignore_unmatch = 0;
 140
 141 static struct option builtin_rm_options[] = {
 142         OPT__DRY_RUN(&show_only, "dry run"),
 143         OPT__QUIET(&quiet, "be quiet"),
 144         OPT_BOOLEAN( 0 , "cached",         &index_only, "only remove from the index"),
 145         OPT__FORCE(&force, "override the up-to-date check"),
 146         OPT_BOOLEAN('r', NULL,             &recursive,  "allow recursive removal"),
 147         OPT_BOOLEAN( 0 , "ignore-unmatch", &ignore_unmatch,
 148                                 "exit with a zero status even if nothing matched"),
 149         OPT_END(),
 150 };
 151
 152 int cmd_rm(int argc, const char **argv, const char *prefix)
 153 {
 154         int i, newfd;
 155         const char **pathspec;
 156         char *seen;
 157
 158         git_config(git_default_config, NULL);
 159
 160         argc = parse_options(argc, argv, prefix, builtin_rm_options,
 161                              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
 173         pathspec = get_pathspec(prefix, argv);
 174         refresh_index(&the_index, REFRESH_QUIET, pathspec, NULL, NULL);
 175
 176         seen = NULL;
 177         for (i = 0; pathspec[i] ; i++)
 178                 /* nothing */;
 179         seen = xcalloc(i, 1);
 180
 181         for (i = 0; i < active_nr; i++) {
 182                 struct cache_entry *ce = active_cache[i];
 183                 if (!match_pathspec(pathspec, ce->name, ce_namelen(ce), 0, seen))
 184                         continue;
 185                 add_list(ce->name);
 186         }
 187
 188         if (pathspec) {
 189                 const char *match;
 190                 int seen_any = 0;
 191                 for (i = 0; (match = pathspec[i]) != NULL ; i++) {
 192                         if (!seen[i]) {
 193                                 if (!ignore_unmatch) {
 194                                         die("pathspec '%s' did not match any files",
 195                                             match);
 196                                 }
 197                         }
 198                         else {
 199                                 seen_any = 1;
 200                         }
 201                         if (!recursive && seen[i] == MATCHED_RECURSIVELY)
 202                                 die("not removing '%s' recursively without -r",
 203                                     *match ? match : ".");
 204                 }
 205
 206                 if (! seen_any)
 207                         exit(0);
 208         }
 209
 210         /*
 211          * If not forced, the file, the index and the HEAD (if exists)
 212          * must match; but the file can already been removed, since
 213          * this sequence is a natural "novice" way:
 214          *
 215          *      rm F; git rm F
 216          *
 217          * Further, if HEAD commit exists, "diff-index --cached" must
 218          * report no changes unless forced.
 219          */
 220         if (!force) {
 221                 unsigned char sha1[20];
 222                 if (get_sha1("HEAD", sha1))
 223                         hashclr(sha1);
 224                 if (check_local_mod(sha1, index_only))
 225                         exit(1);
 226         }
 227
 228         /*
 229          * First remove the names from the index: we won't commit
 230          * the index unless all of them succeed.
 231          */
 232         for (i = 0; i < list.nr; i++) {
 233                 const char *path = list.name[i];
 234                 if (!quiet)
 235                         printf("rm '%s'\n", path);
 236
 237                 if (remove_file_from_cache(path))
 238                         die("git rm: unable to remove %s", path);
 239         }
 240
 241         if (show_only)
 242                 return 0;
 243
 244         /*
 245          * Then, unless we used "--cached", remove the filenames from
 246          * the workspace. If we fail to remove the first one, we
 247          * abort the "git rm" (but once we've successfully removed
 248          * any file at all, we'll go ahead and commit to it all:
 249          * by then we've already committed ourselves and can't fail
 250          * in the middle)
 251          */
 252         if (!index_only) {
 253                 int removed = 0;
 254                 for (i = 0; i < list.nr; i++) {
 255                         const char *path = list.name[i];
 256                         if (!remove_path(path)) {
 257                                 removed = 1;
 258                                 continue;
 259                         }
 260                         if (!removed)
 261                                 die_errno("git rm: '%s'", path);
 262                 }
 263         }
 264
 265         if (active_cache_changed) {
 266                 if (write_cache(newfd, active_cache, active_nr) ||
 267                     commit_locked_index(&lock_file))
 268                         die("Unable to write new index file");
 269         }
 270
 271         return 0;
 272 }