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