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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         int len = prefix ? strlen(prefix) : 0;
  23         const char **result = xmalloc((count + 1) * sizeof(const char *));
  24         memcpy(result, pathspec, count * sizeof(const char *));
  25         result[count] = NULL;
  26         for (i = 0; i < count; i++) {
  27                 int length = strlen(result[i]);
  28                 if (length > 0 && result[i][length - 1] == '/') {
  29                         result[i] = xmemdupz(result[i], length - 1);
  30                 }
  31                 if (base_name) {
  32                         const char *last_slash = strrchr(result[i], '/');
  33                         if (last_slash)
  34                                 result[i] = last_slash + 1;
  35                 }
  36                 result[i] = prefix_path(prefix, len, result[i]);
  37                 if (!result[i])
  38                         exit(1); /* error already given */
  39         }
  40         return result;
  41 }
  42
  43 static void show_list(const char *label, struct path_list *list)
  44 {
  45         if (list->nr > 0) {
  46                 int i;
  47                 printf("%s", label);
  48                 for (i = 0; i < list->nr; i++)
  49                         printf("%s%s", i > 0 ? ", " : "", list->items[i].path);
  50                 putchar('\n');
  51         }
  52 }
  53
  54 static const char *add_slash(const char *path)
  55 {
  56         int len = strlen(path);
  57         if (path[len - 1] != '/') {
  58                 char *with_slash = xmalloc(len + 2);
  59                 memcpy(with_slash, path, len);
  60                 with_slash[len++] = '/';
  61                 with_slash[len] = 0;
  62                 return with_slash;
  63         }
  64         return path;
  65 }
  66
  67 static struct lock_file lock_file;
  68
  69 int cmd_mv(int argc, const char **argv, const char *prefix)
  70 {
  71         int i, newfd;
  72         int verbose = 0, show_only = 0, force = 0, ignore_errors = 0;
  73         struct option builtin_mv_options[] = {
  74                 OPT__DRY_RUN(&show_only),
  75                 OPT_BOOLEAN('f', NULL, &force, "force move/rename even if target exists"),
  76                 OPT_BOOLEAN('k', NULL, &ignore_errors, "skip move/rename errors"),
  77                 OPT_END(),
  78         };
  79         const char **source, **destination, **dest_path;
  80         enum update_mode { BOTH = 0, WORKING_DIRECTORY, INDEX } *modes;
  81         struct stat st;
  82         struct path_list overwritten = {NULL, 0, 0, 0};
  83         struct path_list src_for_dst = {NULL, 0, 0, 0};
  84         struct path_list added = {NULL, 0, 0, 0};
  85         struct path_list deleted = {NULL, 0, 0, 0};
  86         struct path_list changed = {NULL, 0, 0, 0};
  87
  88         git_config(git_default_config);
  89
  90         newfd = hold_locked_index(&lock_file, 1);
  91         if (read_cache() < 0)
  92                 die("index file corrupt");
  93
  94         argc = parse_options(argc, argv, builtin_mv_options, builtin_mv_usage, 0);
  95         if (--argc < 1)
  96                 usage_with_options(builtin_mv_usage, builtin_mv_options);
  97
  98         source = copy_pathspec(prefix, argv, argc, 0);
  99         modes = xcalloc(argc, sizeof(enum update_mode));
 100         dest_path = copy_pathspec(prefix, argv + argc, 1, 0);
 101
 102         if (dest_path[0][0] == '\0')
 103                 /* special case: "." was normalized to "" */
 104                 destination = copy_pathspec(dest_path[0], argv, argc, 1);
 105         else if (!lstat(dest_path[0], &st) &&
 106                         S_ISDIR(st.st_mode)) {
 107                 dest_path[0] = add_slash(dest_path[0]);
 108                 destination = copy_pathspec(dest_path[0], argv, argc, 1);
 109         } else {
 110                 if (argc != 1)
 111                         usage_with_options(builtin_mv_usage, builtin_mv_options);
 112                 destination = dest_path;
 113         }
 114
 115         /* Checking */
 116         for (i = 0; i < argc; i++) {
 117                 const char *src = source[i], *dst = destination[i];
 118                 int length, src_is_dir;
 119                 const char *bad = NULL;
 120
 121                 if (show_only)
 122                         printf("Checking rename of '%s' to '%s'\n", src, dst);
 123
 124                 length = strlen(src);
 125                 if (lstat(src, &st) < 0)
 126                         bad = "bad source";
 127                 else if (!strncmp(src, dst, length) &&
 128                                 (dst[length] == 0 || dst[length] == '/')) {
 129                         bad = "can not move directory into itself";
 130                 } else if ((src_is_dir = S_ISDIR(st.st_mode))
 131                                 && lstat(dst, &st) == 0)
 132                         bad = "cannot move directory over file";
 133                 else if (src_is_dir) {
 134                         const char *src_w_slash = add_slash(src);
 135                         int len_w_slash = length + 1;
 136                         int first, last;
 137
 138                         modes[i] = WORKING_DIRECTORY;
 139
 140                         first = cache_name_pos(src_w_slash, len_w_slash);
 141                         if (first >= 0)
 142                                 die ("Huh? %.*s is in index?",
 143                                                 len_w_slash, src_w_slash);
 144
 145                         first = -1 - first;
 146                         for (last = first; last < active_nr; last++) {
 147                                 const char *path = active_cache[last]->name;
 148                                 if (strncmp(path, src_w_slash, len_w_slash))
 149                                         break;
 150                         }
 151                         free((char *)src_w_slash);
 152
 153                         if (last - first < 1)
 154                                 bad = "source directory is empty";
 155                         else {
 156                                 int j, dst_len;
 157
 158                                 if (last - first > 0) {
 159                                         source = xrealloc(source,
 160                                                         (argc + last - first)
 161                                                         * sizeof(char *));
 162                                         destination = xrealloc(destination,
 163                                                         (argc + last - first)
 164                                                         * sizeof(char *));
 165                                         modes = xrealloc(modes,
 166                                                         (argc + last - first)
 167                                                         * sizeof(enum update_mode));
 168                                 }
 169
 170                                 dst = add_slash(dst);
 171                                 dst_len = strlen(dst);
 172
 173                                 for (j = 0; j < last - first; j++) {
 174                                         const char *path =
 175                                                 active_cache[first + j]->name;
 176                                         source[argc + j] = path;
 177                                         destination[argc + j] =
 178                                                 prefix_path(dst, dst_len,
 179                                                         path + length + 1);
 180                                         modes[argc + j] = INDEX;
 181                                 }
 182                                 argc += last - first;
 183                         }
 184                 } else if (lstat(dst, &st) == 0) {
 185                         bad = "destination exists";
 186                         if (force) {
 187                                 /*
 188                                  * only files can overwrite each other:
 189                                  * check both source and destination
 190                                  */
 191                                 if (S_ISREG(st.st_mode)) {
 192                                         fprintf(stderr, "Warning: %s;"
 193                                                         " will overwrite!\n",
 194                                                         bad);
 195                                         bad = NULL;
 196                                         path_list_insert(dst, &overwritten);
 197                                 } else
 198                                         bad = "Cannot overwrite";
 199                         }
 200                 } else if (cache_name_pos(src, length) < 0)
 201                         bad = "not under version control";
 202                 else if (path_list_has_path(&src_for_dst, dst))
 203                         bad = "multiple sources for the same target";
 204                 else
 205                         path_list_insert(dst, &src_for_dst);
 206
 207                 if (bad) {
 208                         if (ignore_errors) {
 209                                 if (--argc > 0) {
 210                                         memmove(source + i, source + i + 1,
 211                                                 (argc - i) * sizeof(char *));
 212                                         memmove(destination + i,
 213                                                 destination + i + 1,
 214                                                 (argc - i) * sizeof(char *));
 215                                 }
 216                         } else
 217                                 die ("%s, source=%s, destination=%s",
 218                                      bad, src, dst);
 219                 }
 220         }
 221
 222         for (i = 0; i < argc; i++) {
 223                 const char *src = source[i], *dst = destination[i];
 224                 enum update_mode mode = modes[i];
 225                 if (show_only || verbose)
 226                         printf("Renaming %s to %s\n", src, dst);
 227                 if (!show_only && mode != INDEX &&
 228                                 rename(src, dst) < 0 && !ignore_errors)
 229                         die ("renaming %s failed: %s", src, strerror(errno));
 230
 231                 if (mode == WORKING_DIRECTORY)
 232                         continue;
 233
 234                 if (cache_name_pos(src, strlen(src)) >= 0) {
 235                         path_list_insert(src, &deleted);
 236
 237                         /* destination can be a directory with 1 file inside */
 238                         if (path_list_has_path(&overwritten, dst))
 239                                 path_list_insert(dst, &changed);
 240                         else
 241                                 path_list_insert(dst, &added);
 242                 } else
 243                         path_list_insert(dst, &added);
 244         }
 245
 246         if (show_only) {
 247                 show_list("Changed  : ", &changed);
 248                 show_list("Adding   : ", &added);
 249                 show_list("Deleting : ", &deleted);
 250         } else {
 251                 for (i = 0; i < changed.nr; i++) {
 252                         const char *path = changed.items[i].path;
 253                         int j = cache_name_pos(path, strlen(path));
 254                         struct cache_entry *ce = active_cache[j];
 255
 256                         if (j < 0)
 257                                 die ("Huh? Cache entry for %s unknown?", path);
 258                         refresh_cache_entry(ce, 0);
 259                 }
 260
 261                 for (i = 0; i < added.nr; i++) {
 262                         const char *path = added.items[i].path;
 263                         add_file_to_cache(path, verbose);
 264                 }
 265
 266                 for (i = 0; i < deleted.nr; i++)
 267                         remove_file_from_cache(deleted.items[i].path);
 268
 269                 if (active_cache_changed) {
 270                         if (write_cache(newfd, active_cache, active_nr) ||
 271                             commit_locked_index(&lock_file))
 272                                 die("Unable to write new index file");
 273                 }
 274         }
 275
 276         return 0;
 277 }