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                         continue;
  94                 /*
  95                  * It is Ok to remove a newly added path, as long as
  96                  * it is cache-clean.
  97                  */
  98                 if (get_tree_entry(head, name, sha1, &mode))
  99                         continue;
 100                 /*
 101                  * Otherwise make sure the version from the HEAD
 102                  * matches the index.
 103                  */
 104                 if (ce->ce_mode != create_ce_mode(mode) ||
 105                     hashcmp(ce->sha1, sha1))
 106                         errs = error("'%s' has changes staged in the index "
 107                                      "(hint: try -f)", name);
 108         }
 109         return errs;
 110 }
 111
 112 static struct lock_file lock_file;
 113
 114 int cmd_rm(int argc, const char **argv, const char *prefix)
 115 {
 116         int i, newfd;
 117         int show_only = 0, force = 0, index_only = 0, recursive = 0;
 118         const char **pathspec;
 119         char *seen;
 120
 121         git_config(git_default_config);
 122
 123         newfd = hold_lock_file_for_update(&lock_file, get_index_file(), 1);
 124
 125         if (read_cache() < 0)
 126                 die("index file corrupt");
 127
 128         for (i = 1 ; i < argc ; i++) {
 129                 const char *arg = argv[i];
 130
 131                 if (*arg != '-')
 132                         break;
 133                 else if (!strcmp(arg, "--")) {
 134                         i++;
 135                         break;
 136                 }
 137                 else if (!strcmp(arg, "-n"))
 138                         show_only = 1;
 139                 else if (!strcmp(arg, "--cached"))
 140                         index_only = 1;
 141                 else if (!strcmp(arg, "-f"))
 142                         force = 1;
 143                 else if (!strcmp(arg, "-r"))
 144                         recursive = 1;
 145                 else
 146                         usage(builtin_rm_usage);
 147         }
 148         if (argc <= i)
 149                 usage(builtin_rm_usage);
 150
 151         pathspec = get_pathspec(prefix, argv + i);
 152         seen = NULL;
 153         for (i = 0; pathspec[i] ; i++)
 154                 /* nothing */;
 155         seen = xcalloc(i, 1);
 156
 157         for (i = 0; i < active_nr; i++) {
 158                 struct cache_entry *ce = active_cache[i];
 159                 if (!match_pathspec(pathspec, ce->name, ce_namelen(ce), 0, seen))
 160                         continue;
 161                 add_list(ce->name);
 162         }
 163
 164         if (pathspec) {
 165                 const char *match;
 166                 for (i = 0; (match = pathspec[i]) != NULL ; i++) {
 167                         if (!seen[i])
 168                                 die("pathspec '%s' did not match any files",
 169                                     match);
 170                         if (!recursive && seen[i] == MATCHED_RECURSIVELY)
 171                                 die("not removing '%s' recursively without -r",
 172                                     *match ? match : ".");
 173                 }
 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 fm 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))
 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                 printf("rm '%s'\n", path);
 201
 202                 if (remove_file_from_cache(path))
 203                         die("git-rm: unable to remove %s", path);
 204                 cache_tree_invalidate_path(active_cache_tree, 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_file(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                     close(newfd) || commit_lock_file(&lock_file))
 234                         die("Unable to write new index file");
 235         }
 236
 237         return 0;
 238 }