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   1 /*
   2  * "git mv" builtin command
   3  *
   4  * Copyright (C) 2006 Johannes Schindelin
   5  */
   6 #include "builtin.h"
   7 #include "lockfile.h"
   8 #include "dir.h"
   9 #include "cache-tree.h"
  10 #include "string-list.h"
  11 #include "parse-options.h"
  12 #include "submodule.h"
  13
  14 static const char * const builtin_mv_usage[] = {
  15         N_("git mv [<options>] <source>... <destination>"),
  16         NULL
  17 };
  18
  19 #define DUP_BASENAME 1
  20 #define KEEP_TRAILING_SLASH 2
  21
  22 static const char **internal_copy_pathspec(const char *prefix,
  23                                            const char **pathspec,
  24                                            int count, unsigned flags)
  25 {
  26         int i;
  27         const char **result;
  28         ALLOC_ARRAY(result, count + 1);
  29         memcpy(result, pathspec, count * sizeof(const char *));
  30         result[count] = NULL;
  31         for (i = 0; i < count; i++) {
  32                 int length = strlen(result[i]);
  33                 int to_copy = length;
  34                 while (!(flags & KEEP_TRAILING_SLASH) &&
  35                        to_copy > 0 && is_dir_sep(result[i][to_copy - 1]))
  36                         to_copy--;
  37                 if (to_copy != length || flags & DUP_BASENAME) {
  38                         char *it = xmemdupz(result[i], to_copy);
  39                         if (flags & DUP_BASENAME) {
  40                                 result[i] = xstrdup(basename(it));
  41                                 free(it);
  42                         } else
  43                                 result[i] = it;
  44                 }
  45         }
  46         return get_pathspec(prefix, result);
  47 }
  48
  49 static const char *add_slash(const char *path)
  50 {
  51         size_t len = strlen(path);
  52         if (path[len - 1] != '/') {
  53                 char *with_slash = xmalloc(st_add(len, 2));
  54                 memcpy(with_slash, path, len);
  55                 with_slash[len++] = '/';
  56                 with_slash[len] = 0;
  57                 return with_slash;
  58         }
  59         return path;
  60 }
  61
  62 static struct lock_file lock_file;
  63 #define SUBMODULE_WITH_GITDIR ((const char *)1)
  64
  65 static void prepare_move_submodule(const char *src, int first,
  66                                    const char **submodule_gitfile)
  67 {
  68         struct strbuf submodule_dotgit = STRBUF_INIT;
  69         if (!S_ISGITLINK(active_cache[first]->ce_mode))
  70                 die(_("Directory %s is in index and no submodule?"), src);
  71         if (!is_staging_gitmodules_ok())
  72                 die(_("Please stage your changes to .gitmodules or stash them to proceed"));
  73         strbuf_addf(&submodule_dotgit, "%s/.git", src);
  74         *submodule_gitfile = read_gitfile(submodule_dotgit.buf);
  75         if (*submodule_gitfile)
  76                 *submodule_gitfile = xstrdup(*submodule_gitfile);
  77         else
  78                 *submodule_gitfile = SUBMODULE_WITH_GITDIR;
  79         strbuf_release(&submodule_dotgit);
  80 }
  81
  82 static int index_range_of_same_dir(const char *src, int length,
  83                                    int *first_p, int *last_p)
  84 {
  85         const char *src_w_slash = add_slash(src);
  86         int first, last, len_w_slash = length + 1;
  87
  88         first = cache_name_pos(src_w_slash, len_w_slash);
  89         if (first >= 0)
  90                 die(_("%.*s is in index"), len_w_slash, src_w_slash);
  91
  92         first = -1 - first;
  93         for (last = first; last < active_nr; last++) {
  94                 const char *path = active_cache[last]->name;
  95                 if (strncmp(path, src_w_slash, len_w_slash))
  96                         break;
  97         }
  98         if (src_w_slash != src)
  99                 free((char *)src_w_slash);
 100         *first_p = first;
 101         *last_p = last;
 102         return last - first;
 103 }
 104
 105 int cmd_mv(int argc, const char **argv, const char *prefix)
 106 {
 107         int i, gitmodules_modified = 0;
 108         int verbose = 0, show_only = 0, force = 0, ignore_errors = 0;
 109         struct option builtin_mv_options[] = {
 110                 OPT__VERBOSE(&verbose, N_("be verbose")),
 111                 OPT__DRY_RUN(&show_only, N_("dry run")),
 112                 OPT__FORCE(&force, N_("force move/rename even if target exists")),
 113                 OPT_BOOL('k', NULL, &ignore_errors, N_("skip move/rename errors")),
 114                 OPT_END(),
 115         };
 116         const char **source, **destination, **dest_path, **submodule_gitfile;
 117         enum update_mode { BOTH = 0, WORKING_DIRECTORY, INDEX } *modes;
 118         struct stat st;
 119         struct string_list src_for_dst = STRING_LIST_INIT_NODUP;
 120
 121         gitmodules_config();
 122         git_config(git_default_config, NULL);
 123
 124         argc = parse_options(argc, argv, prefix, builtin_mv_options,
 125                              builtin_mv_usage, 0);
 126         if (--argc < 1)
 127                 usage_with_options(builtin_mv_usage, builtin_mv_options);
 128
 129         hold_locked_index(&lock_file, 1);
 130         if (read_cache() < 0)
 131                 die(_("index file corrupt"));
 132
 133         source = internal_copy_pathspec(prefix, argv, argc, 0);
 134         modes = xcalloc(argc, sizeof(enum update_mode));
 135         /*
 136          * Keep trailing slash, needed to let
 137          * "git mv file no-such-dir/" error out.
 138          */
 139         dest_path = internal_copy_pathspec(prefix, argv + argc, 1,
 140                                            KEEP_TRAILING_SLASH);
 141         submodule_gitfile = xcalloc(argc, sizeof(char *));
 142
 143         if (dest_path[0][0] == '\0')
 144                 /* special case: "." was normalized to "" */
 145                 destination = internal_copy_pathspec(dest_path[0], argv, argc, DUP_BASENAME);
 146         else if (!lstat(dest_path[0], &st) &&
 147                         S_ISDIR(st.st_mode)) {
 148                 dest_path[0] = add_slash(dest_path[0]);
 149                 destination = internal_copy_pathspec(dest_path[0], argv, argc, DUP_BASENAME);
 150         } else {
 151                 if (argc != 1)
 152                         die(_("destination '%s' is not a directory"), dest_path[0]);
 153                 destination = dest_path;
 154         }
 155
 156         /* Checking */
 157         for (i = 0; i < argc; i++) {
 158                 const char *src = source[i], *dst = destination[i];
 159                 int length, src_is_dir;
 160                 const char *bad = NULL;
 161
 162                 if (show_only)
 163                         printf(_("Checking rename of '%s' to '%s'\n"), src, dst);
 164
 165                 length = strlen(src);
 166                 if (lstat(src, &st) < 0)
 167                         bad = _("bad source");
 168                 else if (!strncmp(src, dst, length) &&
 169                                 (dst[length] == 0 || dst[length] == '/')) {
 170                         bad = _("can not move directory into itself");
 171                 } else if ((src_is_dir = S_ISDIR(st.st_mode))
 172                                 && lstat(dst, &st) == 0)
 173                         bad = _("cannot move directory over file");
 174                 else if (src_is_dir) {
 175                         int first = cache_name_pos(src, length), last;
 176
 177                         if (first >= 0)
 178                                 prepare_move_submodule(src, first,
 179                                                        submodule_gitfile + i);
 180                         else if (index_range_of_same_dir(src, length,
 181                                                          &first, &last) < 1)
 182                                 bad = _("source directory is empty");
 183                         else { /* last - first >= 1 */
 184                                 int j, dst_len, n;
 185
 186                                 modes[i] = WORKING_DIRECTORY;
 187                                 n = argc + last - first;
 188                                 REALLOC_ARRAY(source, n);
 189                                 REALLOC_ARRAY(destination, n);
 190                                 REALLOC_ARRAY(modes, n);
 191                                 REALLOC_ARRAY(submodule_gitfile, n);
 192
 193                                 dst = add_slash(dst);
 194                                 dst_len = strlen(dst);
 195
 196                                 for (j = 0; j < last - first; j++) {
 197                                         const char *path = active_cache[first + j]->name;
 198                                         source[argc + j] = path;
 199                                         destination[argc + j] =
 200                                                 prefix_path(dst, dst_len, path + length + 1);
 201                                         modes[argc + j] = INDEX;
 202                                         submodule_gitfile[argc + j] = NULL;
 203                                 }
 204                                 argc += last - first;
 205                         }
 206                 } else if (cache_name_pos(src, length) < 0)
 207                         bad = _("not under version control");
 208                 else if (lstat(dst, &st) == 0 &&
 209                          (!ignore_case || strcasecmp(src, dst))) {
 210                         bad = _("destination exists");
 211                         if (force) {
 212                                 /*
 213                                  * only files can overwrite each other:
 214                                  * check both source and destination
 215                                  */
 216                                 if (S_ISREG(st.st_mode) || S_ISLNK(st.st_mode)) {
 217                                         if (verbose)
 218                                                 warning(_("overwriting '%s'"), dst);
 219                                         bad = NULL;
 220                                 } else
 221                                         bad = _("Cannot overwrite");
 222                         }
 223                 } else if (string_list_has_string(&src_for_dst, dst))
 224                         bad = _("multiple sources for the same target");
 225                 else if (is_dir_sep(dst[strlen(dst) - 1]))
 226                         bad = _("destination directory does not exist");
 227                 else
 228                         string_list_insert(&src_for_dst, dst);
 229
 230                 if (!bad)
 231                         continue;
 232                 if (!ignore_errors)
 233                         die(_("%s, source=%s, destination=%s"),
 234                              bad, src, dst);
 235                 if (--argc > 0) {
 236                         int n = argc - i;
 237                         memmove(source + i, source + i + 1,
 238                                 n * sizeof(char *));
 239                         memmove(destination + i, destination + i + 1,
 240                                 n * sizeof(char *));
 241                         memmove(modes + i, modes + i + 1,
 242                                 n * sizeof(enum update_mode));
 243                         memmove(submodule_gitfile + i, submodule_gitfile + i + 1,
 244                                 n * sizeof(char *));
 245                         i--;
 246                 }
 247         }
 248
 249         for (i = 0; i < argc; i++) {
 250                 const char *src = source[i], *dst = destination[i];
 251                 enum update_mode mode = modes[i];
 252                 int pos;
 253                 if (show_only || verbose)
 254                         printf(_("Renaming %s to %s\n"), src, dst);
 255                 if (show_only)
 256                         continue;
 257                 if (mode != INDEX && rename(src, dst) < 0) {
 258                         if (ignore_errors)
 259                                 continue;
 260                         die_errno(_("renaming '%s' failed"), src);
 261                 }
 262                 if (submodule_gitfile[i]) {
 263                         if (submodule_gitfile[i] != SUBMODULE_WITH_GITDIR)
 264                                 connect_work_tree_and_git_dir(dst, submodule_gitfile[i]);
 265                         if (!update_path_in_gitmodules(src, dst))
 266                                 gitmodules_modified = 1;
 267                 }
 268
 269                 if (mode == WORKING_DIRECTORY)
 270                         continue;
 271
 272                 pos = cache_name_pos(src, strlen(src));
 273                 assert(pos >= 0);
 274                 if (!show_only)
 275                         rename_cache_entry_at(pos, dst);
 276         }
 277
 278         if (gitmodules_modified)
 279                 stage_updated_gitmodules();
 280
 281         if (active_cache_changed &&
 282             write_locked_index(&the_index, &lock_file, COMMIT_LOCK))
 283                 die(_("Unable to write new index file"));
 284
 285         return 0;
 286 }