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