Git 2.14.1
[git] / builtin / mv.c
1 /*
2  * "git mv" builtin command
3  *
4  * Copyright (C) 2006 Johannes Schindelin
5  */
6 #include "builtin.h"
7 #include "config.h"
8 #include "pathspec.h"
9 #include "lockfile.h"
10 #include "dir.h"
11 #include "cache-tree.h"
12 #include "string-list.h"
13 #include "parse-options.h"
14 #include "submodule.h"
15
16 static const char * const builtin_mv_usage[] = {
17         N_("git mv [<options>] <source>... <destination>"),
18         NULL
19 };
20
21 #define DUP_BASENAME 1
22 #define KEEP_TRAILING_SLASH 2
23
24 static const char **internal_prefix_pathspec(const char *prefix,
25                                              const char **pathspec,
26                                              int count, unsigned flags)
27 {
28         int i;
29         const char **result;
30         int prefixlen = prefix ? strlen(prefix) : 0;
31         ALLOC_ARRAY(result, count + 1);
32
33         /* Create an intermediate copy of the pathspec based on the flags */
34         for (i = 0; i < count; i++) {
35                 int length = strlen(pathspec[i]);
36                 int to_copy = length;
37                 char *it;
38                 while (!(flags & KEEP_TRAILING_SLASH) &&
39                        to_copy > 0 && is_dir_sep(pathspec[i][to_copy - 1]))
40                         to_copy--;
41
42                 it = xmemdupz(pathspec[i], to_copy);
43                 if (flags & DUP_BASENAME) {
44                         result[i] = xstrdup(basename(it));
45                         free(it);
46                 } else {
47                         result[i] = it;
48                 }
49         }
50         result[count] = NULL;
51
52         /* Prefix the pathspec and free the old intermediate strings */
53         for (i = 0; i < count; i++) {
54                 const char *match = prefix_path(prefix, prefixlen, result[i]);
55                 free((char *) result[i]);
56                 result[i] = match;
57         }
58
59         return result;
60 }
61
62 static const char *add_slash(const char *path)
63 {
64         size_t len = strlen(path);
65         if (path[len - 1] != '/') {
66                 char *with_slash = xmalloc(st_add(len, 2));
67                 memcpy(with_slash, path, len);
68                 with_slash[len++] = '/';
69                 with_slash[len] = 0;
70                 return with_slash;
71         }
72         return path;
73 }
74
75 static struct lock_file lock_file;
76 #define SUBMODULE_WITH_GITDIR ((const char *)1)
77
78 static void prepare_move_submodule(const char *src, int first,
79                                    const char **submodule_gitfile)
80 {
81         struct strbuf submodule_dotgit = STRBUF_INIT;
82         if (!S_ISGITLINK(active_cache[first]->ce_mode))
83                 die(_("Directory %s is in index and no submodule?"), src);
84         if (!is_staging_gitmodules_ok())
85                 die(_("Please stage your changes to .gitmodules or stash them to proceed"));
86         strbuf_addf(&submodule_dotgit, "%s/.git", src);
87         *submodule_gitfile = read_gitfile(submodule_dotgit.buf);
88         if (*submodule_gitfile)
89                 *submodule_gitfile = xstrdup(*submodule_gitfile);
90         else
91                 *submodule_gitfile = SUBMODULE_WITH_GITDIR;
92         strbuf_release(&submodule_dotgit);
93 }
94
95 static int index_range_of_same_dir(const char *src, int length,
96                                    int *first_p, int *last_p)
97 {
98         const char *src_w_slash = add_slash(src);
99         int first, last, len_w_slash = length + 1;
100
101         first = cache_name_pos(src_w_slash, len_w_slash);
102         if (first >= 0)
103                 die(_("%.*s is in index"), len_w_slash, src_w_slash);
104
105         first = -1 - first;
106         for (last = first; last < active_nr; last++) {
107                 const char *path = active_cache[last]->name;
108                 if (strncmp(path, src_w_slash, len_w_slash))
109                         break;
110         }
111         if (src_w_slash != src)
112                 free((char *)src_w_slash);
113         *first_p = first;
114         *last_p = last;
115         return last - first;
116 }
117
118 int cmd_mv(int argc, const char **argv, const char *prefix)
119 {
120         int i, flags, gitmodules_modified = 0;
121         int verbose = 0, show_only = 0, force = 0, ignore_errors = 0;
122         struct option builtin_mv_options[] = {
123                 OPT__VERBOSE(&verbose, N_("be verbose")),
124                 OPT__DRY_RUN(&show_only, N_("dry run")),
125                 OPT__FORCE(&force, N_("force move/rename even if target exists")),
126                 OPT_BOOL('k', NULL, &ignore_errors, N_("skip move/rename errors")),
127                 OPT_END(),
128         };
129         const char **source, **destination, **dest_path, **submodule_gitfile;
130         enum update_mode { BOTH = 0, WORKING_DIRECTORY, INDEX } *modes;
131         struct stat st;
132         struct string_list src_for_dst = STRING_LIST_INIT_NODUP;
133
134         gitmodules_config();
135         git_config(git_default_config, NULL);
136
137         argc = parse_options(argc, argv, prefix, builtin_mv_options,
138                              builtin_mv_usage, 0);
139         if (--argc < 1)
140                 usage_with_options(builtin_mv_usage, builtin_mv_options);
141
142         hold_locked_index(&lock_file, LOCK_DIE_ON_ERROR);
143         if (read_cache() < 0)
144                 die(_("index file corrupt"));
145
146         source = internal_prefix_pathspec(prefix, argv, argc, 0);
147         modes = xcalloc(argc, sizeof(enum update_mode));
148         /*
149          * Keep trailing slash, needed to let
150          * "git mv file no-such-dir/" error out, except in the case
151          * "git mv directory no-such-dir/".
152          */
153         flags = KEEP_TRAILING_SLASH;
154         if (argc == 1 && is_directory(argv[0]) && !is_directory(argv[1]))
155                 flags = 0;
156         dest_path = internal_prefix_pathspec(prefix, argv + argc, 1, flags);
157         submodule_gitfile = xcalloc(argc, sizeof(char *));
158
159         if (dest_path[0][0] == '\0')
160                 /* special case: "." was normalized to "" */
161                 destination = internal_prefix_pathspec(dest_path[0], argv, argc, DUP_BASENAME);
162         else if (!lstat(dest_path[0], &st) &&
163                         S_ISDIR(st.st_mode)) {
164                 dest_path[0] = add_slash(dest_path[0]);
165                 destination = internal_prefix_pathspec(dest_path[0], argv, argc, DUP_BASENAME);
166         } else {
167                 if (argc != 1)
168                         die(_("destination '%s' is not a directory"), dest_path[0]);
169                 destination = dest_path;
170         }
171
172         /* Checking */
173         for (i = 0; i < argc; i++) {
174                 const char *src = source[i], *dst = destination[i];
175                 int length, src_is_dir;
176                 const char *bad = NULL;
177
178                 if (show_only)
179                         printf(_("Checking rename of '%s' to '%s'\n"), src, dst);
180
181                 length = strlen(src);
182                 if (lstat(src, &st) < 0)
183                         bad = _("bad source");
184                 else if (!strncmp(src, dst, length) &&
185                                 (dst[length] == 0 || dst[length] == '/')) {
186                         bad = _("can not move directory into itself");
187                 } else if ((src_is_dir = S_ISDIR(st.st_mode))
188                                 && lstat(dst, &st) == 0)
189                         bad = _("cannot move directory over file");
190                 else if (src_is_dir) {
191                         int first = cache_name_pos(src, length), last;
192
193                         if (first >= 0)
194                                 prepare_move_submodule(src, first,
195                                                        submodule_gitfile + i);
196                         else if (index_range_of_same_dir(src, length,
197                                                          &first, &last) < 1)
198                                 bad = _("source directory is empty");
199                         else { /* last - first >= 1 */
200                                 int j, dst_len, n;
201
202                                 modes[i] = WORKING_DIRECTORY;
203                                 n = argc + last - first;
204                                 REALLOC_ARRAY(source, n);
205                                 REALLOC_ARRAY(destination, n);
206                                 REALLOC_ARRAY(modes, n);
207                                 REALLOC_ARRAY(submodule_gitfile, n);
208
209                                 dst = add_slash(dst);
210                                 dst_len = strlen(dst);
211
212                                 for (j = 0; j < last - first; j++) {
213                                         const char *path = active_cache[first + j]->name;
214                                         source[argc + j] = path;
215                                         destination[argc + j] =
216                                                 prefix_path(dst, dst_len, path + length + 1);
217                                         modes[argc + j] = INDEX;
218                                         submodule_gitfile[argc + j] = NULL;
219                                 }
220                                 argc += last - first;
221                         }
222                 } else if (cache_name_pos(src, length) < 0)
223                         bad = _("not under version control");
224                 else if (lstat(dst, &st) == 0 &&
225                          (!ignore_case || strcasecmp(src, dst))) {
226                         bad = _("destination exists");
227                         if (force) {
228                                 /*
229                                  * only files can overwrite each other:
230                                  * check both source and destination
231                                  */
232                                 if (S_ISREG(st.st_mode) || S_ISLNK(st.st_mode)) {
233                                         if (verbose)
234                                                 warning(_("overwriting '%s'"), dst);
235                                         bad = NULL;
236                                 } else
237                                         bad = _("Cannot overwrite");
238                         }
239                 } else if (string_list_has_string(&src_for_dst, dst))
240                         bad = _("multiple sources for the same target");
241                 else if (is_dir_sep(dst[strlen(dst) - 1]))
242                         bad = _("destination directory does not exist");
243                 else
244                         string_list_insert(&src_for_dst, dst);
245
246                 if (!bad)
247                         continue;
248                 if (!ignore_errors)
249                         die(_("%s, source=%s, destination=%s"),
250                              bad, src, dst);
251                 if (--argc > 0) {
252                         int n = argc - i;
253                         memmove(source + i, source + i + 1,
254                                 n * sizeof(char *));
255                         memmove(destination + i, destination + i + 1,
256                                 n * sizeof(char *));
257                         memmove(modes + i, modes + i + 1,
258                                 n * sizeof(enum update_mode));
259                         memmove(submodule_gitfile + i, submodule_gitfile + i + 1,
260                                 n * sizeof(char *));
261                         i--;
262                 }
263         }
264
265         for (i = 0; i < argc; i++) {
266                 const char *src = source[i], *dst = destination[i];
267                 enum update_mode mode = modes[i];
268                 int pos;
269                 if (show_only || verbose)
270                         printf(_("Renaming %s to %s\n"), src, dst);
271                 if (show_only)
272                         continue;
273                 if (mode != INDEX && rename(src, dst) < 0) {
274                         if (ignore_errors)
275                                 continue;
276                         die_errno(_("renaming '%s' failed"), src);
277                 }
278                 if (submodule_gitfile[i]) {
279                         if (submodule_gitfile[i] != SUBMODULE_WITH_GITDIR)
280                                 connect_work_tree_and_git_dir(dst, submodule_gitfile[i]);
281                         if (!update_path_in_gitmodules(src, dst))
282                                 gitmodules_modified = 1;
283                 }
284
285                 if (mode == WORKING_DIRECTORY)
286                         continue;
287
288                 pos = cache_name_pos(src, strlen(src));
289                 assert(pos >= 0);
290                 if (!show_only)
291                         rename_cache_entry_at(pos, dst);
292         }
293
294         if (gitmodules_modified)
295                 stage_updated_gitmodules();
296
297         if (active_cache_changed &&
298             write_locked_index(&the_index, &lock_file, COMMIT_LOCK))
299                 die(_("Unable to write new index file"));
300
301         return 0;
302 }