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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 "path-list.h"
  11 #include "parse-options.h"
  12
  13 static const char * const builtin_mv_usage[] = {
  14         "git-mv [options] <source>... <destination>",
  15         NULL
  16 };
  17
  18 static const char **copy_pathspec(const char *prefix, const char **pathspec,
  19                                   int count, int base_name)
  20 {
  21         int i;
  22         const char **result = xmalloc((count + 1) * sizeof(const char *));
  23         memcpy(result, pathspec, count * sizeof(const char *));
  24         result[count] = NULL;
  25         for (i = 0; i < count; i++) {
  26                 int length = strlen(result[i]);
  27                 if (length > 0 && result[i][length - 1] == '/') {
  28                         result[i] = xmemdupz(result[i], length - 1);
  29                 }
  30                 if (base_name) {
  31                         const char *last_slash = strrchr(result[i], '/');
  32                         if (last_slash)
  33                                 result[i] = last_slash + 1;
  34                 }
  35         }
  36         return get_pathspec(prefix, result);
  37 }
  38
  39 static void show_list(const char *label, struct path_list *list)
  40 {
  41         if (list->nr > 0) {
  42                 int i;
  43                 printf("%s", label);
  44                 for (i = 0; i < list->nr; i++)
  45                         printf("%s%s", i > 0 ? ", " : "", list->items[i].path);
  46                 putchar('\n');
  47         }
  48 }
  49
  50 static const char *add_slash(const char *path)
  51 {
  52         int len = strlen(path);
  53         if (path[len - 1] != '/') {
  54                 char *with_slash = xmalloc(len + 2);
  55                 memcpy(with_slash, path, len);
  56                 with_slash[len++] = '/';
  57                 with_slash[len] = 0;
  58                 return with_slash;
  59         }
  60         return path;
  61 }
  62
  63 static struct lock_file lock_file;
  64
  65 int cmd_mv(int argc, const char **argv, const char *prefix)
  66 {
  67         int i, newfd;
  68         int verbose = 0, show_only = 0, force = 0, ignore_errors = 0;
  69         struct option builtin_mv_options[] = {
  70                 OPT__DRY_RUN(&show_only),
  71                 OPT_BOOLEAN('f', NULL, &force, "force move/rename even if target exists"),
  72                 OPT_BOOLEAN('k', NULL, &ignore_errors, "skip move/rename errors"),
  73                 OPT_END(),
  74         };
  75         const char **source, **destination, **dest_path;
  76         enum update_mode { BOTH = 0, WORKING_DIRECTORY, INDEX } *modes;
  77         struct stat st;
  78         struct path_list overwritten = {NULL, 0, 0, 0};
  79         struct path_list src_for_dst = {NULL, 0, 0, 0};
  80         struct path_list added = {NULL, 0, 0, 0};
  81         struct path_list deleted = {NULL, 0, 0, 0};
  82         struct path_list changed = {NULL, 0, 0, 0};
  83
  84         git_config(git_default_config);
  85
  86         newfd = hold_locked_index(&lock_file, 1);
  87         if (read_cache() < 0)
  88                 die("index file corrupt");
  89
  90         argc = parse_options(argc, argv, builtin_mv_options, builtin_mv_usage, 0);
  91         if (--argc < 1)
  92                 usage_with_options(builtin_mv_usage, builtin_mv_options);
  93
  94         source = copy_pathspec(prefix, argv, argc, 0);
  95         modes = xcalloc(argc, sizeof(enum update_mode));
  96         dest_path = copy_pathspec(prefix, argv + argc, 1, 0);
  97
  98         if (dest_path[0][0] == '\0')
  99                 /* special case: "." was normalized to "" */
 100                 destination = copy_pathspec(dest_path[0], argv, argc, 1);
 101         else if (!lstat(dest_path[0], &st) &&
 102                         S_ISDIR(st.st_mode)) {
 103                 dest_path[0] = add_slash(dest_path[0]);
 104                 destination = copy_pathspec(dest_path[0], argv, argc, 1);
 105         } else {
 106                 if (argc != 1)
 107                         usage_with_options(builtin_mv_usage, builtin_mv_options);
 108                 destination = dest_path;
 109         }
 110
 111         /* Checking */
 112         for (i = 0; i < argc; i++) {
 113                 const char *src = source[i], *dst = destination[i];
 114                 int length, src_is_dir;
 115                 const char *bad = NULL;
 116
 117                 if (show_only)
 118                         printf("Checking rename of '%s' to '%s'\n", src, dst);
 119
 120                 length = strlen(src);
 121                 if (lstat(src, &st) < 0)
 122                         bad = "bad source";
 123                 else if (!strncmp(src, dst, length) &&
 124                                 (dst[length] == 0 || dst[length] == '/')) {
 125                         bad = "can not move directory into itself";
 126                 } else if ((src_is_dir = S_ISDIR(st.st_mode))
 127                                 && lstat(dst, &st) == 0)
 128                         bad = "cannot move directory over file";
 129                 else if (src_is_dir) {
 130                         const char *src_w_slash = add_slash(src);
 131                         int len_w_slash = length + 1;
 132                         int first, last;
 133
 134                         modes[i] = WORKING_DIRECTORY;
 135
 136                         first = cache_name_pos(src_w_slash, len_w_slash);
 137                         if (first >= 0)
 138                                 die ("Huh? %.*s is in index?",
 139                                                 len_w_slash, src_w_slash);
 140
 141                         first = -1 - first;
 142                         for (last = first; last < active_nr; last++) {
 143                                 const char *path = active_cache[last]->name;
 144                                 if (strncmp(path, src_w_slash, len_w_slash))
 145                                         break;
 146                         }
 147                         free((char *)src_w_slash);
 148
 149                         if (last - first < 1)
 150                                 bad = "source directory is empty";
 151                         else {
 152                                 int j, dst_len;
 153
 154                                 if (last - first > 0) {
 155                                         source = xrealloc(source,
 156                                                         (argc + last - first)
 157                                                         * sizeof(char *));
 158                                         destination = xrealloc(destination,
 159                                                         (argc + last - first)
 160                                                         * sizeof(char *));
 161                                         modes = xrealloc(modes,
 162                                                         (argc + last - first)
 163                                                         * sizeof(enum update_mode));
 164                                 }
 165
 166                                 dst = add_slash(dst);
 167                                 dst_len = strlen(dst) - 1;
 168
 169                                 for (j = 0; j < last - first; j++) {
 170                                         const char *path =
 171                                                 active_cache[first + j]->name;
 172                                         source[argc + j] = path;
 173                                         destination[argc + j] =
 174                                                 prefix_path(dst, dst_len,
 175                                                         path + length);
 176                                         modes[argc + j] = INDEX;
 177                                 }
 178                                 argc += last - first;
 179                         }
 180                 } else if (lstat(dst, &st) == 0) {
 181                         bad = "destination exists";
 182                         if (force) {
 183                                 /*
 184                                  * only files can overwrite each other:
 185                                  * check both source and destination
 186                                  */
 187                                 if (S_ISREG(st.st_mode)) {
 188                                         fprintf(stderr, "Warning: %s;"
 189                                                         " will overwrite!\n",
 190                                                         bad);
 191                                         bad = NULL;
 192                                         path_list_insert(dst, &overwritten);
 193                                 } else
 194                                         bad = "Cannot overwrite";
 195                         }
 196                 } else if (cache_name_pos(src, length) < 0)
 197                         bad = "not under version control";
 198                 else if (path_list_has_path(&src_for_dst, dst))
 199                         bad = "multiple sources for the same target";
 200                 else
 201                         path_list_insert(dst, &src_for_dst);
 202
 203                 if (bad) {
 204                         if (ignore_errors) {
 205                                 if (--argc > 0) {
 206                                         memmove(source + i, source + i + 1,
 207                                                 (argc - i) * sizeof(char *));
 208                                         memmove(destination + i,
 209                                                 destination + i + 1,
 210                                                 (argc - i) * sizeof(char *));
 211                                 }
 212                         } else
 213                                 die ("%s, source=%s, destination=%s",
 214                                      bad, src, dst);
 215                 }
 216         }
 217
 218         for (i = 0; i < argc; i++) {
 219                 const char *src = source[i], *dst = destination[i];
 220                 enum update_mode mode = modes[i];
 221                 if (show_only || verbose)
 222                         printf("Renaming %s to %s\n", src, dst);
 223                 if (!show_only && mode != INDEX &&
 224                                 rename(src, dst) < 0 && !ignore_errors)
 225                         die ("renaming %s failed: %s", src, strerror(errno));
 226
 227                 if (mode == WORKING_DIRECTORY)
 228                         continue;
 229
 230                 if (cache_name_pos(src, strlen(src)) >= 0) {
 231                         path_list_insert(src, &deleted);
 232
 233                         /* destination can be a directory with 1 file inside */
 234                         if (path_list_has_path(&overwritten, dst))
 235                                 path_list_insert(dst, &changed);
 236                         else
 237                                 path_list_insert(dst, &added);
 238                 } else
 239                         path_list_insert(dst, &added);
 240         }
 241
 242         if (show_only) {
 243                 show_list("Changed  : ", &changed);
 244                 show_list("Adding   : ", &added);
 245                 show_list("Deleting : ", &deleted);
 246         } else {
 247                 for (i = 0; i < changed.nr; i++) {
 248                         const char *path = changed.items[i].path;
 249                         int j = cache_name_pos(path, strlen(path));
 250                         struct cache_entry *ce = active_cache[j];
 251
 252                         if (j < 0)
 253                                 die ("Huh? Cache entry for %s unknown?", path);
 254                         refresh_cache_entry(ce, 0);
 255                 }
 256
 257                 for (i = 0; i < added.nr; i++) {
 258                         const char *path = added.items[i].path;
 259                         add_file_to_cache(path, verbose);
 260                 }
 261
 262                 for (i = 0; i < deleted.nr; i++)
 263                         remove_file_from_cache(deleted.items[i].path);
 264
 265                 if (active_cache_changed) {
 266                         if (write_cache(newfd, active_cache, active_nr) ||
 267                             close(newfd) ||
 268                             commit_locked_index(&lock_file))
 269                                 die("Unable to write new index file");
 270                 }
 271         }
 272
 273         return 0;
 274 }