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] [--] <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)
  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
  69                 pos = cache_name_pos(name, strlen(name));
  70                 if (pos < 0)
  71                         continue; /* removing unmerged entry */
  72                 ce = active_cache[pos];
  73
  74                 if (lstat(ce->name, &st) < 0) {
  75                         if (errno != ENOENT)
  76                                 fprintf(stderr, "warning: '%s': %s",
  77                                         ce->name, strerror(errno));
  78                         /* It already vanished from the working tree */
  79                         continue;
  80                 }
  81                 else if (S_ISDIR(st.st_mode)) {
  82                         /* if a file was removed and it is now a
  83                          * directory, that is the same as ENOENT as
  84                          * far as git is concerned; we do not track
  85                          * directories.
  86                          */
  87                         continue;
  88                 }
  89                 if (ce_match_stat(ce, &st, 0))
  90                         errs = error("'%s' has local modifications "
  91                                      "(hint: try -f)", ce->name);
  92                 if (no_head
  93                      || get_tree_entry(head, name, sha1, &mode)
  94                      || ce->ce_mode != create_ce_mode(mode)
  95                      || hashcmp(ce->sha1, sha1))
  96                         errs = error("'%s' has changes staged in the index "
  97                                      "(hint: try -f)", name);
  98         }
  99         return errs;
 100 }
 101
 102 static struct lock_file lock_file;
 103
 104 int cmd_rm(int argc, const char **argv, const char *prefix)
 105 {
 106         int i, newfd;
 107         int show_only = 0, force = 0, index_only = 0, recursive = 0;
 108         const char **pathspec;
 109         char *seen;
 110
 111         git_config(git_default_config);
 112
 113         newfd = hold_lock_file_for_update(&lock_file, get_index_file(), 1);
 114
 115         if (read_cache() < 0)
 116                 die("index file corrupt");
 117
 118         for (i = 1 ; i < argc ; i++) {
 119                 const char *arg = argv[i];
 120
 121                 if (*arg != '-')
 122                         break;
 123                 else if (!strcmp(arg, "--")) {
 124                         i++;
 125                         break;
 126                 }
 127                 else if (!strcmp(arg, "-n"))
 128                         show_only = 1;
 129                 else if (!strcmp(arg, "--cached"))
 130                         index_only = 1;
 131                 else if (!strcmp(arg, "-f"))
 132                         force = 1;
 133                 else if (!strcmp(arg, "-r"))
 134                         recursive = 1;
 135                 else
 136                         usage(builtin_rm_usage);
 137         }
 138         if (argc <= i)
 139                 usage(builtin_rm_usage);
 140
 141         pathspec = get_pathspec(prefix, argv + i);
 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                 for (i = 0; (match = pathspec[i]) != NULL ; i++) {
 157                         if (!seen[i])
 158                                 die("pathspec '%s' did not match any files",
 159                                     match);
 160                         if (!recursive && seen[i] == MATCHED_RECURSIVELY)
 161                                 die("not removing '%s' recursively without -r",
 162                                     *match ? match : ".");
 163                 }
 164         }
 165
 166         /*
 167          * If not forced, the file, the index and the HEAD (if exists)
 168          * must match; but the file can already been removed, since
 169          * this sequence is a natural "novice" way:
 170          *
 171          *      rm F; git fm F
 172          *
 173          * Further, if HEAD commit exists, "diff-index --cached" must
 174          * report no changes unless forced.
 175          */
 176         if (!force) {
 177                 unsigned char sha1[20];
 178                 if (get_sha1("HEAD", sha1))
 179                         hashclr(sha1);
 180                 if (check_local_mod(sha1))
 181                         exit(1);
 182         }
 183
 184         /*
 185          * First remove the names from the index: we won't commit
 186          * the index unless all of them succeed.
 187          */
 188         for (i = 0; i < list.nr; i++) {
 189                 const char *path = list.name[i];
 190                 printf("rm '%s'\n", path);
 191
 192                 if (remove_file_from_cache(path))
 193                         die("git-rm: unable to remove %s", path);
 194                 cache_tree_invalidate_path(active_cache_tree, path);
 195         }
 196
 197         if (show_only)
 198                 return 0;
 199
 200         /*
 201          * Then, unless we used "--cached", remove the filenames from
 202          * the workspace. If we fail to remove the first one, we
 203          * abort the "git rm" (but once we've successfully removed
 204          * any file at all, we'll go ahead and commit to it all:
 205          * by then we've already committed ourselves and can't fail
 206          * in the middle)
 207          */
 208         if (!index_only) {
 209                 int removed = 0;
 210                 for (i = 0; i < list.nr; i++) {
 211                         const char *path = list.name[i];
 212                         if (!remove_file(path)) {
 213                                 removed = 1;
 214                                 continue;
 215                         }
 216                         if (!removed)
 217                                 die("git-rm: %s: %s", path, strerror(errno));
 218                 }
 219         }
 220
 221         if (active_cache_changed) {
 222                 if (write_cache(newfd, active_cache, active_nr) ||
 223                     close(newfd) || commit_lock_file(&lock_file))
 224                         die("Unable to write new index file");
 225         }
 226
 227         return 0;
 228 }