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   1 /*
   2  * "git mv" builtin command
   3  *
   4  * Copyright (C) 2006 Johannes Schindelin
   5  */
   6 #include "builtin.h"
   7 #include "config.h"
   8 #include "pathspec.h"
   9 #include "lockfile.h"
  10 #include "dir.h"
  11 #include "cache-tree.h"
  12 #include "string-list.h"
  13 #include "parse-options.h"
  14 #include "submodule.h"
  15
  16 static const char * const builtin_mv_usage[] = {
  17         N_("git mv [<options>] <source>... <destination>"),
  18         NULL
  19 };
  20
  21 #define DUP_BASENAME 1
  22 #define KEEP_TRAILING_SLASH 2
  23
  24 static const char **internal_prefix_pathspec(const char *prefix,
  25                                              const char **pathspec,
  26                                              int count, unsigned flags)
  27 {
  28         int i;
  29         const char **result;
  30         int prefixlen = prefix ? strlen(prefix) : 0;
  31         ALLOC_ARRAY(result, count + 1);
  32
  33         /* Create an intermediate copy of the pathspec based on the flags */
  34         for (i = 0; i < count; i++) {
  35                 int length = strlen(pathspec[i]);
  36                 int to_copy = length;
  37                 char *it;
  38                 while (!(flags & KEEP_TRAILING_SLASH) &&
  39                        to_copy > 0 && is_dir_sep(pathspec[i][to_copy - 1]))
  40                         to_copy--;
  41
  42                 it = xmemdupz(pathspec[i], to_copy);
  43                 if (flags & DUP_BASENAME) {
  44                         result[i] = xstrdup(basename(it));
  45                         free(it);
  46                 } else {
  47                         result[i] = it;
  48                 }
  49         }
  50         result[count] = NULL;
  51
  52         /* Prefix the pathspec and free the old intermediate strings */
  53         for (i = 0; i < count; i++) {
  54                 const char *match = prefix_path(prefix, prefixlen, result[i]);
  55                 free((char *) result[i]);
  56                 result[i] = match;
  57         }
  58
  59         return result;
  60 }
  61
  62 static const char *add_slash(const char *path)
  63 {
  64         size_t len = strlen(path);
  65         if (path[len - 1] != '/') {
  66                 char *with_slash = xmalloc(st_add(len, 2));
  67                 memcpy(with_slash, path, len);
  68                 with_slash[len++] = '/';
  69                 with_slash[len] = 0;
  70                 return with_slash;
  71         }
  72         return path;
  73 }
  74
  75 static struct lock_file lock_file;
  76 #define SUBMODULE_WITH_GITDIR ((const char *)1)
  77
  78 static void prepare_move_submodule(const char *src, int first,
  79                                    const char **submodule_gitfile)
  80 {
  81         struct strbuf submodule_dotgit = STRBUF_INIT;
  82         if (!S_ISGITLINK(active_cache[first]->ce_mode))
  83                 die(_("Directory %s is in index and no submodule?"), src);
  84         if (!is_staging_gitmodules_ok(&the_index))
  85                 die(_("Please stage your changes to .gitmodules or stash them to proceed"));
  86         strbuf_addf(&submodule_dotgit, "%s/.git", src);
  87         *submodule_gitfile = read_gitfile(submodule_dotgit.buf);
  88         if (*submodule_gitfile)
  89                 *submodule_gitfile = xstrdup(*submodule_gitfile);
  90         else
  91                 *submodule_gitfile = SUBMODULE_WITH_GITDIR;
  92         strbuf_release(&submodule_dotgit);
  93 }
  94
  95 static int index_range_of_same_dir(const char *src, int length,
  96                                    int *first_p, int *last_p)
  97 {
  98         const char *src_w_slash = add_slash(src);
  99         int first, last, len_w_slash = length + 1;
 100
 101         first = cache_name_pos(src_w_slash, len_w_slash);
 102         if (first >= 0)
 103                 die(_("%.*s is in index"), len_w_slash, src_w_slash);
 104
 105         first = -1 - first;
 106         for (last = first; last < active_nr; last++) {
 107                 const char *path = active_cache[last]->name;
 108                 if (strncmp(path, src_w_slash, len_w_slash))
 109                         break;
 110         }
 111         if (src_w_slash != src)
 112                 free((char *)src_w_slash);
 113         *first_p = first;
 114         *last_p = last;
 115         return last - first;
 116 }
 117
 118 int cmd_mv(int argc, const char **argv, const char *prefix)
 119 {
 120         int i, flags, gitmodules_modified = 0;
 121         int verbose = 0, show_only = 0, force = 0, ignore_errors = 0;
 122         struct option builtin_mv_options[] = {
 123                 OPT__VERBOSE(&verbose, N_("be verbose")),
 124                 OPT__DRY_RUN(&show_only, N_("dry run")),
 125                 OPT__FORCE(&force, N_("force move/rename even if target exists")),
 126                 OPT_BOOL('k', NULL, &ignore_errors, N_("skip move/rename errors")),
 127                 OPT_END(),
 128         };
 129         const char **source, **destination, **dest_path, **submodule_gitfile;
 130         enum update_mode { BOTH = 0, WORKING_DIRECTORY, INDEX } *modes;
 131         struct stat st;
 132         struct string_list src_for_dst = STRING_LIST_INIT_NODUP;
 133
 134         git_config(git_default_config, NULL);
 135
 136         argc = parse_options(argc, argv, prefix, builtin_mv_options,
 137                              builtin_mv_usage, 0);
 138         if (--argc < 1)
 139                 usage_with_options(builtin_mv_usage, builtin_mv_options);
 140
 141         hold_locked_index(&lock_file, LOCK_DIE_ON_ERROR);
 142         if (read_cache() < 0)
 143                 die(_("index file corrupt"));
 144
 145         source = internal_prefix_pathspec(prefix, argv, argc, 0);
 146         modes = xcalloc(argc, sizeof(enum update_mode));
 147         /*
 148          * Keep trailing slash, needed to let
 149          * "git mv file no-such-dir/" error out, except in the case
 150          * "git mv directory no-such-dir/".
 151          */
 152         flags = KEEP_TRAILING_SLASH;
 153         if (argc == 1 && is_directory(argv[0]) && !is_directory(argv[1]))
 154                 flags = 0;
 155         dest_path = internal_prefix_pathspec(prefix, argv + argc, 1, flags);
 156         submodule_gitfile = xcalloc(argc, sizeof(char *));
 157
 158         if (dest_path[0][0] == '\0')
 159                 /* special case: "." was normalized to "" */
 160                 destination = internal_prefix_pathspec(dest_path[0], argv, argc, DUP_BASENAME);
 161         else if (!lstat(dest_path[0], &st) &&
 162                         S_ISDIR(st.st_mode)) {
 163                 dest_path[0] = add_slash(dest_path[0]);
 164                 destination = internal_prefix_pathspec(dest_path[0], argv, argc, DUP_BASENAME);
 165         } else {
 166                 if (argc != 1)
 167                         die(_("destination '%s' is not a directory"), dest_path[0]);
 168                 destination = dest_path;
 169         }
 170
 171         /* Checking */
 172         for (i = 0; i < argc; i++) {
 173                 const char *src = source[i], *dst = destination[i];
 174                 int length, src_is_dir;
 175                 const char *bad = NULL;
 176
 177                 if (show_only)
 178                         printf(_("Checking rename of '%s' to '%s'\n"), src, dst);
 179
 180                 length = strlen(src);
 181                 if (lstat(src, &st) < 0)
 182                         bad = _("bad source");
 183                 else if (!strncmp(src, dst, length) &&
 184                                 (dst[length] == 0 || dst[length] == '/')) {
 185                         bad = _("can not move directory into itself");
 186                 } else if ((src_is_dir = S_ISDIR(st.st_mode))
 187                                 && lstat(dst, &st) == 0)
 188                         bad = _("cannot move directory over file");
 189                 else if (src_is_dir) {
 190                         int first = cache_name_pos(src, length), last;
 191
 192                         if (first >= 0)
 193                                 prepare_move_submodule(src, first,
 194                                                        submodule_gitfile + i);
 195                         else if (index_range_of_same_dir(src, length,
 196                                                          &first, &last) < 1)
 197                                 bad = _("source directory is empty");
 198                         else { /* last - first >= 1 */
 199                                 int j, dst_len, n;
 200
 201                                 modes[i] = WORKING_DIRECTORY;
 202                                 n = argc + last - first;
 203                                 REALLOC_ARRAY(source, n);
 204                                 REALLOC_ARRAY(destination, n);
 205                                 REALLOC_ARRAY(modes, n);
 206                                 REALLOC_ARRAY(submodule_gitfile, n);
 207
 208                                 dst = add_slash(dst);
 209                                 dst_len = strlen(dst);
 210
 211                                 for (j = 0; j < last - first; j++) {
 212                                         const char *path = active_cache[first + j]->name;
 213                                         source[argc + j] = path;
 214                                         destination[argc + j] =
 215                                                 prefix_path(dst, dst_len, path + length + 1);
 216                                         modes[argc + j] = INDEX;
 217                                         submodule_gitfile[argc + j] = NULL;
 218                                 }
 219                                 argc += last - first;
 220                         }
 221                 } else if (cache_name_pos(src, length) < 0)
 222                         bad = _("not under version control");
 223                 else if (lstat(dst, &st) == 0 &&
 224                          (!ignore_case || strcasecmp(src, dst))) {
 225                         bad = _("destination exists");
 226                         if (force) {
 227                                 /*
 228                                  * only files can overwrite each other:
 229                                  * check both source and destination
 230                                  */
 231                                 if (S_ISREG(st.st_mode) || S_ISLNK(st.st_mode)) {
 232                                         if (verbose)
 233                                                 warning(_("overwriting '%s'"), dst);
 234                                         bad = NULL;
 235                                 } else
 236                                         bad = _("Cannot overwrite");
 237                         }
 238                 } else if (string_list_has_string(&src_for_dst, dst))
 239                         bad = _("multiple sources for the same target");
 240                 else if (is_dir_sep(dst[strlen(dst) - 1]))
 241                         bad = _("destination directory does not exist");
 242                 else
 243                         string_list_insert(&src_for_dst, dst);
 244
 245                 if (!bad)
 246                         continue;
 247                 if (!ignore_errors)
 248                         die(_("%s, source=%s, destination=%s"),
 249                              bad, src, dst);
 250                 if (--argc > 0) {
 251                         int n = argc - i;
 252                         memmove(source + i, source + i + 1,
 253                                 n * sizeof(char *));
 254                         memmove(destination + i, destination + i + 1,
 255                                 n * sizeof(char *));
 256                         memmove(modes + i, modes + i + 1,
 257                                 n * sizeof(enum update_mode));
 258                         memmove(submodule_gitfile + i, submodule_gitfile + i + 1,
 259                                 n * sizeof(char *));
 260                         i--;
 261                 }
 262         }
 263
 264         for (i = 0; i < argc; i++) {
 265                 const char *src = source[i], *dst = destination[i];
 266                 enum update_mode mode = modes[i];
 267                 int pos;
 268                 if (show_only || verbose)
 269                         printf(_("Renaming %s to %s\n"), src, dst);
 270                 if (show_only)
 271                         continue;
 272                 if (mode != INDEX && rename(src, dst) < 0) {
 273                         if (ignore_errors)
 274                                 continue;
 275                         die_errno(_("renaming '%s' failed"), src);
 276                 }
 277                 if (submodule_gitfile[i]) {
 278                         if (submodule_gitfile[i] != SUBMODULE_WITH_GITDIR)
 279                                 connect_work_tree_and_git_dir(dst, submodule_gitfile[i]);
 280                         if (!update_path_in_gitmodules(src, dst))
 281                                 gitmodules_modified = 1;
 282                 }
 283
 284                 if (mode == WORKING_DIRECTORY)
 285                         continue;
 286
 287                 pos = cache_name_pos(src, strlen(src));
 288                 assert(pos >= 0);
 289                 if (!show_only)
 290                         rename_cache_entry_at(pos, dst);
 291         }
 292
 293         if (gitmodules_modified)
 294                 stage_updated_gitmodules();
 295
 296         if (active_cache_changed &&
 297             write_locked_index(&the_index, &lock_file, COMMIT_LOCK))
 298                 die(_("Unable to write new index file"));
 299
 300         return 0;
 301 }