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 "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 && is_dir_sep(result[i][length - 1]))
  28                         result[i] = xmemdupz(result[i], length - 1);
  29                 if (base_name)
  30                         result[i] = basename((char *)result[i]);
  31         }
  32         return get_pathspec(prefix, result);
  33 }
  34
  35 static const char *add_slash(const char *path)
  36 {
  37         int len = strlen(path);
  38         if (path[len - 1] != '/') {
  39                 char *with_slash = xmalloc(len + 2);
  40                 memcpy(with_slash, path, len);
  41                 with_slash[len++] = '/';
  42                 with_slash[len] = 0;
  43                 return with_slash;
  44         }
  45         return path;
  46 }
  47
  48 static struct lock_file lock_file;
  49
  50 int cmd_mv(int argc, const char **argv, const char *prefix)
  51 {
  52         int i, newfd;
  53         int verbose = 0, show_only = 0, force = 0, ignore_errors = 0;
  54         struct option builtin_mv_options[] = {
  55                 OPT__DRY_RUN(&show_only),
  56                 OPT_BOOLEAN('f', NULL, &force, "force move/rename even if target exists"),
  57                 OPT_BOOLEAN('k', NULL, &ignore_errors, "skip move/rename errors"),
  58                 OPT_END(),
  59         };
  60         const char **source, **destination, **dest_path;
  61         enum update_mode { BOTH = 0, WORKING_DIRECTORY, INDEX } *modes;
  62         struct stat st;
  63         struct string_list src_for_dst = {NULL, 0, 0, 0};
  64
  65         git_config(git_default_config, NULL);
  66
  67         newfd = hold_locked_index(&lock_file, 1);
  68         if (read_cache() < 0)
  69                 die("index file corrupt");
  70
  71         argc = parse_options(argc, argv, prefix, builtin_mv_options,
  72                              builtin_mv_usage, 0);
  73         if (--argc < 1)
  74                 usage_with_options(builtin_mv_usage, builtin_mv_options);
  75
  76         source = copy_pathspec(prefix, argv, argc, 0);
  77         modes = xcalloc(argc, sizeof(enum update_mode));
  78         dest_path = copy_pathspec(prefix, argv + argc, 1, 0);
  79
  80         if (dest_path[0][0] == '\0')
  81                 /* special case: "." was normalized to "" */
  82                 destination = copy_pathspec(dest_path[0], argv, argc, 1);
  83         else if (!lstat(dest_path[0], &st) &&
  84                         S_ISDIR(st.st_mode)) {
  85                 dest_path[0] = add_slash(dest_path[0]);
  86                 destination = copy_pathspec(dest_path[0], argv, argc, 1);
  87         } else {
  88                 if (argc != 1)
  89                         usage_with_options(builtin_mv_usage, builtin_mv_options);
  90                 destination = dest_path;
  91         }
  92
  93         /* Checking */
  94         for (i = 0; i < argc; i++) {
  95                 const char *src = source[i], *dst = destination[i];
  96                 int length, src_is_dir;
  97                 const char *bad = NULL;
  98
  99                 if (show_only)
 100                         printf("Checking rename of '%s' to '%s'\n", src, dst);
 101
 102                 length = strlen(src);
 103                 if (lstat(src, &st) < 0)
 104                         bad = "bad source";
 105                 else if (!strncmp(src, dst, length) &&
 106                                 (dst[length] == 0 || dst[length] == '/')) {
 107                         bad = "can not move directory into itself";
 108                 } else if ((src_is_dir = S_ISDIR(st.st_mode))
 109                                 && lstat(dst, &st) == 0)
 110                         bad = "cannot move directory over file";
 111                 else if (src_is_dir) {
 112                         const char *src_w_slash = add_slash(src);
 113                         int len_w_slash = length + 1;
 114                         int first, last;
 115
 116                         modes[i] = WORKING_DIRECTORY;
 117
 118                         first = cache_name_pos(src_w_slash, len_w_slash);
 119                         if (first >= 0)
 120                                 die ("Huh? %.*s is in index?",
 121                                                 len_w_slash, src_w_slash);
 122
 123                         first = -1 - first;
 124                         for (last = first; last < active_nr; last++) {
 125                                 const char *path = active_cache[last]->name;
 126                                 if (strncmp(path, src_w_slash, len_w_slash))
 127                                         break;
 128                         }
 129                         free((char *)src_w_slash);
 130
 131                         if (last - first < 1)
 132                                 bad = "source directory is empty";
 133                         else {
 134                                 int j, dst_len;
 135
 136                                 if (last - first > 0) {
 137                                         source = xrealloc(source,
 138                                                         (argc + last - first)
 139                                                         * sizeof(char *));
 140                                         destination = xrealloc(destination,
 141                                                         (argc + last - first)
 142                                                         * sizeof(char *));
 143                                         modes = xrealloc(modes,
 144                                                         (argc + last - first)
 145                                                         * sizeof(enum update_mode));
 146                                 }
 147
 148                                 dst = add_slash(dst);
 149                                 dst_len = strlen(dst);
 150
 151                                 for (j = 0; j < last - first; j++) {
 152                                         const char *path =
 153                                                 active_cache[first + j]->name;
 154                                         source[argc + j] = path;
 155                                         destination[argc + j] =
 156                                                 prefix_path(dst, dst_len,
 157                                                         path + length + 1);
 158                                         modes[argc + j] = INDEX;
 159                                 }
 160                                 argc += last - first;
 161                         }
 162                 } else if (cache_name_pos(src, length) < 0)
 163                         bad = "not under version control";
 164                 else if (lstat(dst, &st) == 0) {
 165                         bad = "destination exists";
 166                         if (force) {
 167                                 /*
 168                                  * only files can overwrite each other:
 169                                  * check both source and destination
 170                                  */
 171                                 if (S_ISREG(st.st_mode) || S_ISLNK(st.st_mode)) {
 172                                         fprintf(stderr, "Warning: %s;"
 173                                                         " will overwrite!\n",
 174                                                         bad);
 175                                         bad = NULL;
 176                                 } else
 177                                         bad = "Cannot overwrite";
 178                         }
 179                 } else if (string_list_has_string(&src_for_dst, dst))
 180                         bad = "multiple sources for the same target";
 181                 else
 182                         string_list_insert(dst, &src_for_dst);
 183
 184                 if (bad) {
 185                         if (ignore_errors) {
 186                                 if (--argc > 0) {
 187                                         memmove(source + i, source + i + 1,
 188                                                 (argc - i) * sizeof(char *));
 189                                         memmove(destination + i,
 190                                                 destination + i + 1,
 191                                                 (argc - i) * sizeof(char *));
 192                                         i--;
 193                                 }
 194                         } else
 195                                 die ("%s, source=%s, destination=%s",
 196                                      bad, src, dst);
 197                 }
 198         }
 199
 200         for (i = 0; i < argc; i++) {
 201                 const char *src = source[i], *dst = destination[i];
 202                 enum update_mode mode = modes[i];
 203                 int pos;
 204                 if (show_only || verbose)
 205                         printf("Renaming %s to %s\n", src, dst);
 206                 if (!show_only && mode != INDEX &&
 207                                 rename(src, dst) < 0 && !ignore_errors)
 208                         die_errno ("renaming '%s' failed", src);
 209
 210                 if (mode == WORKING_DIRECTORY)
 211                         continue;
 212
 213                 pos = cache_name_pos(src, strlen(src));
 214                 assert(pos >= 0);
 215                 if (!show_only)
 216                         rename_cache_entry_at(pos, dst);
 217         }
 218
 219         if (active_cache_changed) {
 220                 if (write_cache(newfd, active_cache, active_nr) ||
 221                     commit_locked_index(&lock_file))
 222                         die("Unable to write new index file");
 223         }
 224
 225         return 0;
 226 }