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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
  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 const char *add_slash(const char *path)
  40 {
  41         int len = strlen(path);
  42         if (path[len - 1] != '/') {
  43                 char *with_slash = xmalloc(len + 2);
  44                 memcpy(with_slash, path, len);
  45                 with_slash[len++] = '/';
  46                 with_slash[len] = 0;
  47                 return with_slash;
  48         }
  49         return path;
  50 }
  51
  52 static struct lock_file lock_file;
  53
  54 int cmd_mv(int argc, const char **argv, const char *prefix)
  55 {
  56         int i, newfd;
  57         int verbose = 0, show_only = 0, force = 0, ignore_errors = 0;
  58         struct option builtin_mv_options[] = {
  59                 OPT__DRY_RUN(&show_only),
  60                 OPT_BOOLEAN('f', NULL, &force, "force move/rename even if target exists"),
  61                 OPT_BOOLEAN('k', NULL, &ignore_errors, "skip move/rename errors"),
  62                 OPT_END(),
  63         };
  64         const char **source, **destination, **dest_path;
  65         enum update_mode { BOTH = 0, WORKING_DIRECTORY, INDEX } *modes;
  66         struct stat st;
  67         struct string_list src_for_dst = {NULL, 0, 0, 0};
  68
  69         git_config(git_default_config, NULL);
  70
  71         newfd = hold_locked_index(&lock_file, 1);
  72         if (read_cache() < 0)
  73                 die("index file corrupt");
  74
  75         argc = parse_options(argc, argv, prefix, builtin_mv_options,
  76                              builtin_mv_usage, 0);
  77         if (--argc < 1)
  78                 usage_with_options(builtin_mv_usage, builtin_mv_options);
  79
  80         source = copy_pathspec(prefix, argv, argc, 0);
  81         modes = xcalloc(argc, sizeof(enum update_mode));
  82         dest_path = copy_pathspec(prefix, argv + argc, 1, 0);
  83
  84         if (dest_path[0][0] == '\0')
  85                 /* special case: "." was normalized to "" */
  86                 destination = copy_pathspec(dest_path[0], argv, argc, 1);
  87         else if (!lstat(dest_path[0], &st) &&
  88                         S_ISDIR(st.st_mode)) {
  89                 dest_path[0] = add_slash(dest_path[0]);
  90                 destination = copy_pathspec(dest_path[0], argv, argc, 1);
  91         } else {
  92                 if (argc != 1)
  93                         usage_with_options(builtin_mv_usage, builtin_mv_options);
  94                 destination = dest_path;
  95         }
  96
  97         /* Checking */
  98         for (i = 0; i < argc; i++) {
  99                 const char *src = source[i], *dst = destination[i];
 100                 int length, src_is_dir;
 101                 const char *bad = NULL;
 102
 103                 if (show_only)
 104                         printf("Checking rename of '%s' to '%s'\n", src, dst);
 105
 106                 length = strlen(src);
 107                 if (lstat(src, &st) < 0)
 108                         bad = "bad source";
 109                 else if (!strncmp(src, dst, length) &&
 110                                 (dst[length] == 0 || dst[length] == '/')) {
 111                         bad = "can not move directory into itself";
 112                 } else if ((src_is_dir = S_ISDIR(st.st_mode))
 113                                 && lstat(dst, &st) == 0)
 114                         bad = "cannot move directory over file";
 115                 else if (src_is_dir) {
 116                         const char *src_w_slash = add_slash(src);
 117                         int len_w_slash = length + 1;
 118                         int first, last;
 119
 120                         modes[i] = WORKING_DIRECTORY;
 121
 122                         first = cache_name_pos(src_w_slash, len_w_slash);
 123                         if (first >= 0)
 124                                 die ("Huh? %.*s is in index?",
 125                                                 len_w_slash, src_w_slash);
 126
 127                         first = -1 - first;
 128                         for (last = first; last < active_nr; last++) {
 129                                 const char *path = active_cache[last]->name;
 130                                 if (strncmp(path, src_w_slash, len_w_slash))
 131                                         break;
 132                         }
 133                         free((char *)src_w_slash);
 134
 135                         if (last - first < 1)
 136                                 bad = "source directory is empty";
 137                         else {
 138                                 int j, dst_len;
 139
 140                                 if (last - first > 0) {
 141                                         source = xrealloc(source,
 142                                                         (argc + last - first)
 143                                                         * sizeof(char *));
 144                                         destination = xrealloc(destination,
 145                                                         (argc + last - first)
 146                                                         * sizeof(char *));
 147                                         modes = xrealloc(modes,
 148                                                         (argc + last - first)
 149                                                         * sizeof(enum update_mode));
 150                                 }
 151
 152                                 dst = add_slash(dst);
 153                                 dst_len = strlen(dst);
 154
 155                                 for (j = 0; j < last - first; j++) {
 156                                         const char *path =
 157                                                 active_cache[first + j]->name;
 158                                         source[argc + j] = path;
 159                                         destination[argc + j] =
 160                                                 prefix_path(dst, dst_len,
 161                                                         path + length + 1);
 162                                         modes[argc + j] = INDEX;
 163                                 }
 164                                 argc += last - first;
 165                         }
 166                 } else if (cache_name_pos(src, length) < 0)
 167                         bad = "not under version control";
 168                 else if (lstat(dst, &st) == 0) {
 169                         bad = "destination exists";
 170                         if (force) {
 171                                 /*
 172                                  * only files can overwrite each other:
 173                                  * check both source and destination
 174                                  */
 175                                 if (S_ISREG(st.st_mode) || S_ISLNK(st.st_mode)) {
 176                                         fprintf(stderr, "Warning: %s;"
 177                                                         " will overwrite!\n",
 178                                                         bad);
 179                                         bad = NULL;
 180                                 } else
 181                                         bad = "Cannot overwrite";
 182                         }
 183                 } else if (string_list_has_string(&src_for_dst, dst))
 184                         bad = "multiple sources for the same target";
 185                 else
 186                         string_list_insert(dst, &src_for_dst);
 187
 188                 if (bad) {
 189                         if (ignore_errors) {
 190                                 if (--argc > 0) {
 191                                         memmove(source + i, source + i + 1,
 192                                                 (argc - i) * sizeof(char *));
 193                                         memmove(destination + i,
 194                                                 destination + i + 1,
 195                                                 (argc - i) * sizeof(char *));
 196                                         i--;
 197                                 }
 198                         } else
 199                                 die ("%s, source=%s, destination=%s",
 200                                      bad, src, dst);
 201                 }
 202         }
 203
 204         for (i = 0; i < argc; i++) {
 205                 const char *src = source[i], *dst = destination[i];
 206                 enum update_mode mode = modes[i];
 207                 int pos;
 208                 if (show_only || verbose)
 209                         printf("Renaming %s to %s\n", src, dst);
 210                 if (!show_only && mode != INDEX &&
 211                                 rename(src, dst) < 0 && !ignore_errors)
 212                         die ("renaming %s failed: %s", src, strerror(errno));
 213
 214                 if (mode == WORKING_DIRECTORY)
 215                         continue;
 216
 217                 pos = cache_name_pos(src, strlen(src));
 218                 assert(pos >= 0);
 219                 if (!show_only)
 220                         rename_cache_entry_at(pos, dst);
 221         }
 222
 223         if (active_cache_changed) {
 224                 if (write_cache(newfd, active_cache, active_nr) ||
 225                     commit_locked_index(&lock_file))
 226                         die("Unable to write new index file");
 227         }
 228
 229         return 0;
 230 }