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