builtin-mv.c

   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
  12 static const char builtin_mv_usage[] =
  13 "git-mv [-n] [-f] (<source> <destination> | [-k] <source>... <destination>)";
  14
  15 static const char **copy_pathspec(const char *prefix, const char **pathspec,
  16                                   int count, int base_name)
  17 {
  18         int i;
  19         const char **result = xmalloc((count + 1) * sizeof(const char *));
  20         memcpy(result, pathspec, count * sizeof(const char *));
  21         result[count] = NULL;
  22         for (i = 0; i < count; i++) {
  23                 int length = strlen(result[i]);
  24                 if (length > 0 && result[i][length - 1] == '/') {
  25                         char *without_slash = xmalloc(length);
  26                         memcpy(without_slash, result[i], length - 1);
  27                         without_slash[length - 1] = '\0';
  28                         result[i] = without_slash;
  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, count;
  68         int verbose = 0, show_only = 0, force = 0, ignore_errors = 0;
  69         const char **source, **destination, **dest_path;
  70         enum update_mode { BOTH = 0, WORKING_DIRECTORY, INDEX } *modes;
  71         struct stat st;
  72         struct path_list overwritten = {NULL, 0, 0, 0};
  73         struct path_list src_for_dst = {NULL, 0, 0, 0};
  74         struct path_list added = {NULL, 0, 0, 0};
  75         struct path_list deleted = {NULL, 0, 0, 0};
  76         struct path_list changed = {NULL, 0, 0, 0};
  77
  78         git_config(git_default_config);
  79
  80         newfd = hold_lock_file_for_update(&lock_file, get_index_file(), 1);
  81         if (read_cache() < 0)
  82                 die("index file corrupt");
  83
  84         for (i = 1; i < argc; i++) {
  85                 const char *arg = argv[i];
  86
  87                 if (arg[0] != '-')
  88                         break;
  89                 if (!strcmp(arg, "--")) {
  90                         i++;
  91                         break;
  92                 }
  93                 if (!strcmp(arg, "-n")) {
  94                         show_only = 1;
  95                         continue;
  96                 }
  97                 if (!strcmp(arg, "-f")) {
  98                         force = 1;
  99                         continue;
 100                 }
 101                 if (!strcmp(arg, "-k")) {
 102                         ignore_errors = 1;
 103                         continue;
 104                 }
 105                 usage(builtin_mv_usage);
 106         }
 107         count = argc - i - 1;
 108         if (count < 1)
 109                 usage(builtin_mv_usage);
 110
 111         source = copy_pathspec(prefix, argv + i, count, 0);
 112         modes = xcalloc(count, sizeof(enum update_mode));
 113         dest_path = copy_pathspec(prefix, argv + argc - 1, 1, 0);
 114
 115         if (dest_path[0][0] == '\0')
 116                 /* special case: "." was normalized to "" */
 117                 destination = copy_pathspec(dest_path[0], argv + i, count, 1);
 118         else if (!lstat(dest_path[0], &st) &&
 119                         S_ISDIR(st.st_mode)) {
 120                 dest_path[0] = add_slash(dest_path[0]);
 121                 destination = copy_pathspec(dest_path[0], argv + i, count, 1);
 122         } else {
 123                 if (count != 1)
 124                         usage(builtin_mv_usage);
 125                 destination = dest_path;
 126         }
 127
 128         /* Checking */
 129         for (i = 0; i < count; i++) {
 130                 const char *src = source[i], *dst = destination[i];
 131                 int length, src_is_dir;
 132                 const char *bad = NULL;
 133
 134                 if (show_only)
 135                         printf("Checking rename of '%s' to '%s'\n", src, dst);
 136
 137                 length = strlen(src);
 138                 if (lstat(src, &st) < 0)
 139                         bad = "bad source";
 140                 else if (!strncmp(src, dst, length) &&
 141                                 (dst[length] == 0 || dst[length] == '/')) {
 142                         bad = "can not move directory into itself";
 143                 } else if ((src_is_dir = S_ISDIR(st.st_mode))
 144                                 && lstat(dst, &st) == 0)
 145                         bad = "cannot move directory over file";
 146                 else if (src_is_dir) {
 147                         const char *src_w_slash = add_slash(src);
 148                         int len_w_slash = length + 1;
 149                         int first, last;
 150
 151                         modes[i] = WORKING_DIRECTORY;
 152
 153                         first = cache_name_pos(src_w_slash, len_w_slash);
 154                         if (first >= 0)
 155                                 die ("Huh? %.*s is in index?",
 156                                                 len_w_slash, src_w_slash);
 157
 158                         first = -1 - first;
 159                         for (last = first; last < active_nr; last++) {
 160                                 const char *path = active_cache[last]->name;
 161                                 if (strncmp(path, src_w_slash, len_w_slash))
 162                                         break;
 163                         }
 164                         free((char *)src_w_slash);
 165
 166                         if (last - first < 1)
 167                                 bad = "source directory is empty";
 168                         else {
 169                                 int j, dst_len;
 170
 171                                 if (last - first > 0) {
 172                                         source = xrealloc(source,
 173                                                         (count + last - first)
 174                                                         * sizeof(char *));
 175                                         destination = xrealloc(destination,
 176                                                         (count + last - first)
 177                                                         * sizeof(char *));
 178                                         modes = xrealloc(modes,
 179                                                         (count + last - first)
 180                                                         * sizeof(enum update_mode));
 181                                 }
 182
 183                                 dst = add_slash(dst);
 184                                 dst_len = strlen(dst) - 1;
 185
 186                                 for (j = 0; j < last - first; j++) {
 187                                         const char *path =
 188                                                 active_cache[first + j]->name;
 189                                         source[count + j] = path;
 190                                         destination[count + j] =
 191                                                 prefix_path(dst, dst_len,
 192                                                         path + length);
 193                                         modes[count + j] = INDEX;
 194                                 }
 195                                 count += last - first;
 196                         }
 197                 } else if (lstat(dst, &st) == 0) {
 198                         bad = "destination exists";
 199                         if (force) {
 200                                 /*
 201                                  * only files can overwrite each other:
 202                                  * check both source and destination
 203                                  */
 204                                 if (S_ISREG(st.st_mode)) {
 205                                         fprintf(stderr, "Warning: %s;"
 206                                                         " will overwrite!\n",
 207                                                         bad);
 208                                         bad = NULL;
 209                                         path_list_insert(dst, &overwritten);
 210                                 } else
 211                                         bad = "Cannot overwrite";
 212                         }
 213                 } else if (cache_name_pos(src, length) < 0)
 214                         bad = "not under version control";
 215                 else if (path_list_has_path(&src_for_dst, dst))
 216                         bad = "multiple sources for the same target";
 217                 else
 218                         path_list_insert(dst, &src_for_dst);
 219
 220                 if (bad) {
 221                         if (ignore_errors) {
 222                                 if (--count > 0) {
 223                                         memmove(source + i, source + i + 1,
 224                                                 (count - i) * sizeof(char *));
 225                                         memmove(destination + i,
 226                                                 destination + i + 1,
 227                                                 (count - i) * sizeof(char *));
 228                                 }
 229                         } else
 230                                 die ("%s, source=%s, destination=%s",
 231                                      bad, src, dst);
 232                 }
 233         }
 234
 235         for (i = 0; i < count; i++) {
 236                 const char *src = source[i], *dst = destination[i];
 237                 enum update_mode mode = modes[i];
 238                 if (show_only || verbose)
 239                         printf("Renaming %s to %s\n", src, dst);
 240                 if (!show_only && mode != INDEX &&
 241                                 rename(src, dst) < 0 && !ignore_errors)
 242                         die ("renaming %s failed: %s", src, strerror(errno));
 243
 244                 if (mode == WORKING_DIRECTORY)
 245                         continue;
 246
 247                 if (cache_name_pos(src, strlen(src)) >= 0) {
 248                         path_list_insert(src, &deleted);
 249
 250                         /* destination can be a directory with 1 file inside */
 251                         if (path_list_has_path(&overwritten, dst))
 252                                 path_list_insert(dst, &changed);
 253                         else
 254                                 path_list_insert(dst, &added);
 255                 } else
 256                         path_list_insert(dst, &added);
 257         }
 258
 259         if (show_only) {
 260                 show_list("Changed  : ", &changed);
 261                 show_list("Adding   : ", &added);
 262                 show_list("Deleting : ", &deleted);
 263         } else {
 264                 for (i = 0; i < changed.nr; i++) {
 265                         const char *path = changed.items[i].path;
 266                         int j = cache_name_pos(path, strlen(path));
 267                         struct cache_entry *ce = active_cache[j];
 268
 269                         if (j < 0)
 270                                 die ("Huh? Cache entry for %s unknown?", path);
 271                         refresh_cache_entry(ce, 0);
 272                 }
 273
 274                 for (i = 0; i < added.nr; i++) {
 275                         const char *path = added.items[i].path;
 276                         add_file_to_index(path, verbose);
 277                 }
 278
 279                 for (i = 0; i < deleted.nr; i++) {
 280                         const char *path = deleted.items[i].path;
 281                         remove_file_from_cache(path);
 282                         cache_tree_invalidate_path(active_cache_tree, path);
 283                 }
 284
 285                 if (active_cache_changed) {
 286                         if (write_cache(newfd, active_cache, active_nr) ||
 287                             close(newfd) ||
 288                             commit_lock_file(&lock_file))
 289                                 die("Unable to write new index file");
 290                 }
 291         }
 292
 293         return 0;
 294 }