Merge branch 'bc/sha-256-part-2'
[git] / builtin / mv.c
1 /*
2  * "git mv" builtin command
3  *
4  * Copyright (C) 2006 Johannes Schindelin
5  */
6 #define USE_THE_INDEX_COMPATIBILITY_MACROS
7 #include "builtin.h"
8 #include "config.h"
9 #include "pathspec.h"
10 #include "lockfile.h"
11 #include "dir.h"
12 #include "cache-tree.h"
13 #include "string-list.h"
14 #include "parse-options.h"
15 #include "submodule.h"
16
17 static const char * const builtin_mv_usage[] = {
18         N_("git mv [<options>] <source>... <destination>"),
19         NULL
20 };
21
22 #define DUP_BASENAME 1
23 #define KEEP_TRAILING_SLASH 2
24
25 static const char **internal_prefix_pathspec(const char *prefix,
26                                              const char **pathspec,
27                                              int count, unsigned flags)
28 {
29         int i;
30         const char **result;
31         int prefixlen = prefix ? strlen(prefix) : 0;
32         ALLOC_ARRAY(result, count + 1);
33
34         /* Create an intermediate copy of the pathspec based on the flags */
35         for (i = 0; i < count; i++) {
36                 int length = strlen(pathspec[i]);
37                 int to_copy = length;
38                 char *it;
39                 while (!(flags & KEEP_TRAILING_SLASH) &&
40                        to_copy > 0 && is_dir_sep(pathspec[i][to_copy - 1]))
41                         to_copy--;
42
43                 it = xmemdupz(pathspec[i], to_copy);
44                 if (flags & DUP_BASENAME) {
45                         result[i] = xstrdup(basename(it));
46                         free(it);
47                 } else {
48                         result[i] = it;
49                 }
50         }
51         result[count] = NULL;
52
53         /* Prefix the pathspec and free the old intermediate strings */
54         for (i = 0; i < count; i++) {
55                 const char *match = prefix_path(prefix, prefixlen, result[i]);
56                 free((char *) result[i]);
57                 result[i] = match;
58         }
59
60         return result;
61 }
62
63 static const char *add_slash(const char *path)
64 {
65         size_t len = strlen(path);
66         if (path[len - 1] != '/') {
67                 char *with_slash = xmalloc(st_add(len, 2));
68                 memcpy(with_slash, path, len);
69                 with_slash[len++] = '/';
70                 with_slash[len] = 0;
71                 return with_slash;
72         }
73         return path;
74 }
75
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(&the_index))
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                            PARSE_OPT_NOCOMPLETE),
127                 OPT_BOOL('k', NULL, &ignore_errors, N_("skip move/rename errors")),
128                 OPT_END(),
129         };
130         const char **source, **destination, **dest_path, **submodule_gitfile;
131         enum update_mode { BOTH = 0, WORKING_DIRECTORY, INDEX } *modes;
132         struct stat st;
133         struct string_list src_for_dst = STRING_LIST_INIT_NODUP;
134         struct lock_file lock_file = LOCK_INIT;
135
136         git_config(git_default_config, NULL);
137
138         argc = parse_options(argc, argv, prefix, builtin_mv_options,
139                              builtin_mv_usage, 0);
140         if (--argc < 1)
141                 usage_with_options(builtin_mv_usage, builtin_mv_options);
142
143         hold_locked_index(&lock_file, LOCK_DIE_ON_ERROR);
144         if (read_cache() < 0)
145                 die(_("index file corrupt"));
146
147         source = internal_prefix_pathspec(prefix, argv, argc, 0);
148         modes = xcalloc(argc, sizeof(enum update_mode));
149         /*
150          * Keep trailing slash, needed to let
151          * "git mv file no-such-dir/" error out, except in the case
152          * "git mv directory no-such-dir/".
153          */
154         flags = KEEP_TRAILING_SLASH;
155         if (argc == 1 && is_directory(argv[0]) && !is_directory(argv[1]))
156                 flags = 0;
157         dest_path = internal_prefix_pathspec(prefix, argv + argc, 1, flags);
158         submodule_gitfile = xcalloc(argc, sizeof(char *));
159
160         if (dest_path[0][0] == '\0')
161                 /* special case: "." was normalized to "" */
162                 destination = internal_prefix_pathspec(dest_path[0], argv, argc, DUP_BASENAME);
163         else if (!lstat(dest_path[0], &st) &&
164                         S_ISDIR(st.st_mode)) {
165                 dest_path[0] = add_slash(dest_path[0]);
166                 destination = internal_prefix_pathspec(dest_path[0], argv, argc, DUP_BASENAME);
167         } else {
168                 if (argc != 1)
169                         die(_("destination '%s' is not a directory"), dest_path[0]);
170                 destination = dest_path;
171         }
172
173         /* Checking */
174         for (i = 0; i < argc; i++) {
175                 const char *src = source[i], *dst = destination[i];
176                 int length, src_is_dir;
177                 const char *bad = NULL;
178
179                 if (show_only)
180                         printf(_("Checking rename of '%s' to '%s'\n"), src, dst);
181
182                 length = strlen(src);
183                 if (lstat(src, &st) < 0)
184                         bad = _("bad source");
185                 else if (!strncmp(src, dst, length) &&
186                                 (dst[length] == 0 || dst[length] == '/')) {
187                         bad = _("can not move directory into itself");
188                 } else if ((src_is_dir = S_ISDIR(st.st_mode))
189                                 && lstat(dst, &st) == 0)
190                         bad = _("cannot move directory over file");
191                 else if (src_is_dir) {
192                         int first = cache_name_pos(src, length), last;
193
194                         if (first >= 0)
195                                 prepare_move_submodule(src, first,
196                                                        submodule_gitfile + i);
197                         else if (index_range_of_same_dir(src, length,
198                                                          &first, &last) < 1)
199                                 bad = _("source directory is empty");
200                         else { /* last - first >= 1 */
201                                 int j, dst_len, n;
202
203                                 modes[i] = WORKING_DIRECTORY;
204                                 n = argc + last - first;
205                                 REALLOC_ARRAY(source, n);
206                                 REALLOC_ARRAY(destination, n);
207                                 REALLOC_ARRAY(modes, n);
208                                 REALLOC_ARRAY(submodule_gitfile, n);
209
210                                 dst = add_slash(dst);
211                                 dst_len = strlen(dst);
212
213                                 for (j = 0; j < last - first; j++) {
214                                         const char *path = active_cache[first + j]->name;
215                                         source[argc + j] = path;
216                                         destination[argc + j] =
217                                                 prefix_path(dst, dst_len, path + length + 1);
218                                         modes[argc + j] = INDEX;
219                                         submodule_gitfile[argc + j] = NULL;
220                                 }
221                                 argc += last - first;
222                         }
223                 } else if (cache_name_pos(src, length) < 0)
224                         bad = _("not under version control");
225                 else if (lstat(dst, &st) == 0 &&
226                          (!ignore_case || strcasecmp(src, dst))) {
227                         bad = _("destination exists");
228                         if (force) {
229                                 /*
230                                  * only files can overwrite each other:
231                                  * check both source and destination
232                                  */
233                                 if (S_ISREG(st.st_mode) || S_ISLNK(st.st_mode)) {
234                                         if (verbose)
235                                                 warning(_("overwriting '%s'"), dst);
236                                         bad = NULL;
237                                 } else
238                                         bad = _("Cannot overwrite");
239                         }
240                 } else if (string_list_has_string(&src_for_dst, dst))
241                         bad = _("multiple sources for the same target");
242                 else if (is_dir_sep(dst[strlen(dst) - 1]))
243                         bad = _("destination directory does not exist");
244                 else
245                         string_list_insert(&src_for_dst, dst);
246
247                 if (!bad)
248                         continue;
249                 if (!ignore_errors)
250                         die(_("%s, source=%s, destination=%s"),
251                              bad, src, dst);
252                 if (--argc > 0) {
253                         int n = argc - i;
254                         memmove(source + i, source + i + 1,
255                                 n * sizeof(char *));
256                         memmove(destination + i, destination + i + 1,
257                                 n * sizeof(char *));
258                         memmove(modes + i, modes + i + 1,
259                                 n * sizeof(enum update_mode));
260                         memmove(submodule_gitfile + i, submodule_gitfile + i + 1,
261                                 n * sizeof(char *));
262                         i--;
263                 }
264         }
265
266         for (i = 0; i < argc; i++) {
267                 const char *src = source[i], *dst = destination[i];
268                 enum update_mode mode = modes[i];
269                 int pos;
270                 if (show_only || verbose)
271                         printf(_("Renaming %s to %s\n"), src, dst);
272                 if (show_only)
273                         continue;
274                 if (mode != INDEX && rename(src, dst) < 0) {
275                         if (ignore_errors)
276                                 continue;
277                         die_errno(_("renaming '%s' failed"), src);
278                 }
279                 if (submodule_gitfile[i]) {
280                         if (!update_path_in_gitmodules(src, dst))
281                                 gitmodules_modified = 1;
282                         if (submodule_gitfile[i] != SUBMODULE_WITH_GITDIR)
283                                 connect_work_tree_and_git_dir(dst,
284                                                               submodule_gitfile[i],
285                                                               1);
286                 }
287
288                 if (mode == WORKING_DIRECTORY)
289                         continue;
290
291                 pos = cache_name_pos(src, strlen(src));
292                 assert(pos >= 0);
293                 rename_cache_entry_at(pos, dst);
294         }
295
296         if (gitmodules_modified)
297                 stage_updated_gitmodules(&the_index);
298
299         if (write_locked_index(&the_index, &lock_file,
300                                COMMIT_LOCK | SKIP_IF_UNCHANGED))
301                 die(_("Unable to write new index file"));
302
303         return 0;
304 }