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