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