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