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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                 int to_copy = length;
  28                 while (to_copy > 0 && is_dir_sep(result[i][to_copy - 1]))
  29                         to_copy--;
  30                 if (to_copy != length || base_name) {
  31                         char *it = xmemdupz(result[i], to_copy);
  32                         result[i] = base_name ? strdup(basename(it)) : it;
  33                 }
  34         }
  35         return get_pathspec(prefix, result);
  36 }
  37
  38 static const char *add_slash(const char *path)
  39 {
  40         int len = strlen(path);
  41         if (path[len - 1] != '/') {
  42                 char *with_slash = xmalloc(len + 2);
  43                 memcpy(with_slash, path, len);
  44                 with_slash[len++] = '/';
  45                 with_slash[len] = 0;
  46                 return with_slash;
  47         }
  48         return path;
  49 }
  50
  51 static struct lock_file lock_file;
  52
  53 int cmd_mv(int argc, const char **argv, const char *prefix)
  54 {
  55         int i, newfd;
  56         int verbose = 0, show_only = 0, force = 0, ignore_errors = 0;
  57         struct option builtin_mv_options[] = {
  58                 OPT__DRY_RUN(&show_only),
  59                 OPT_BOOLEAN('f', "force", &force, "force move/rename even if target exists"),
  60                 OPT_BOOLEAN('k', NULL, &ignore_errors, "skip move/rename errors"),
  61                 OPT_END(),
  62         };
  63         const char **source, **destination, **dest_path;
  64         enum update_mode { BOTH = 0, WORKING_DIRECTORY, INDEX } *modes;
  65         struct stat st;
  66         struct string_list src_for_dst = STRING_LIST_INIT_NODUP;
  67
  68         git_config(git_default_config, NULL);
  69
  70         argc = parse_options(argc, argv, prefix, builtin_mv_options,
  71                              builtin_mv_usage, 0);
  72         if (--argc < 1)
  73                 usage_with_options(builtin_mv_usage, builtin_mv_options);
  74
  75         newfd = hold_locked_index(&lock_file, 1);
  76         if (read_cache() < 0)
  77                 die("index file corrupt");
  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 (cache_name_pos(src, length) < 0)
 166                         bad = "not under version control";
 167                 else if (lstat(dst, &st) == 0) {
 168                         bad = "destination exists";
 169                         if (force) {
 170                                 /*
 171                                  * only files can overwrite each other:
 172                                  * check both source and destination
 173                                  */
 174                                 if (S_ISREG(st.st_mode) || S_ISLNK(st.st_mode)) {
 175                                         warning("%s; will overwrite!", bad);
 176                                         bad = NULL;
 177                                 } else
 178                                         bad = "Cannot overwrite";
 179                         }
 180                 } else if (string_list_has_string(&src_for_dst, dst))
 181                         bad = "multiple sources for the same target";
 182                 else
 183                         string_list_insert(&src_for_dst, dst);
 184
 185                 if (bad) {
 186                         if (ignore_errors) {
 187                                 if (--argc > 0) {
 188                                         memmove(source + i, source + i + 1,
 189                                                 (argc - i) * sizeof(char *));
 190                                         memmove(destination + i,
 191                                                 destination + i + 1,
 192                                                 (argc - i) * sizeof(char *));
 193                                         i--;
 194                                 }
 195                         } else
 196                                 die ("%s, source=%s, destination=%s",
 197                                      bad, src, dst);
 198                 }
 199         }
 200
 201         for (i = 0; i < argc; i++) {
 202                 const char *src = source[i], *dst = destination[i];
 203                 enum update_mode mode = modes[i];
 204                 int pos;
 205                 if (show_only || verbose)
 206                         printf("Renaming %s to %s\n", src, dst);
 207                 if (!show_only && mode != INDEX &&
 208                                 rename(src, dst) < 0 && !ignore_errors)
 209                         die_errno ("renaming '%s' failed", src);
 210
 211                 if (mode == WORKING_DIRECTORY)
 212                         continue;
 213
 214                 pos = cache_name_pos(src, strlen(src));
 215                 assert(pos >= 0);
 216                 if (!show_only)
 217                         rename_cache_entry_at(pos, dst);
 218         }
 219
 220         if (active_cache_changed) {
 221                 if (write_cache(newfd, active_cache, active_nr) ||
 222                     commit_locked_index(&lock_file))
 223                         die("Unable to write new index file");
 224         }
 225
 226         return 0;
 227 }