Merge branch 'maint'
[git] / 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 "path-list.h"
11
12 static const char builtin_mv_usage[] =
13 "git-mv [-n] [-f] (<source> <destination> | [-k] <source>... <destination>)";
14
15 static const char **copy_pathspec(const char *prefix, const char **pathspec,
16                                   int count, int base_name)
17 {
18         int i;
19         const char **result = xmalloc((count + 1) * sizeof(const char *));
20         memcpy(result, pathspec, count * sizeof(const char *));
21         result[count] = NULL;
22         for (i = 0; i < count; i++) {
23                 int length = strlen(result[i]);
24                 if (length > 0 && result[i][length - 1] == '/') {
25                         result[i] = xmemdupz(result[i], length - 1);
26                 }
27                 if (base_name) {
28                         const char *last_slash = strrchr(result[i], '/');
29                         if (last_slash)
30                                 result[i] = last_slash + 1;
31                 }
32         }
33         return get_pathspec(prefix, result);
34 }
35
36 static void show_list(const char *label, struct path_list *list)
37 {
38         if (list->nr > 0) {
39                 int i;
40                 printf("%s", label);
41                 for (i = 0; i < list->nr; i++)
42                         printf("%s%s", i > 0 ? ", " : "", list->items[i].path);
43                 putchar('\n');
44         }
45 }
46
47 static const char *add_slash(const char *path)
48 {
49         int len = strlen(path);
50         if (path[len - 1] != '/') {
51                 char *with_slash = xmalloc(len + 2);
52                 memcpy(with_slash, path, len);
53                 with_slash[len++] = '/';
54                 with_slash[len] = 0;
55                 return with_slash;
56         }
57         return path;
58 }
59
60 static struct lock_file lock_file;
61
62 int cmd_mv(int argc, const char **argv, const char *prefix)
63 {
64         int i, newfd, count;
65         int verbose = 0, show_only = 0, force = 0, ignore_errors = 0;
66         const char **source, **destination, **dest_path;
67         enum update_mode { BOTH = 0, WORKING_DIRECTORY, INDEX } *modes;
68         struct stat st;
69         struct path_list overwritten = {NULL, 0, 0, 0};
70         struct path_list src_for_dst = {NULL, 0, 0, 0};
71         struct path_list added = {NULL, 0, 0, 0};
72         struct path_list deleted = {NULL, 0, 0, 0};
73         struct path_list changed = {NULL, 0, 0, 0};
74
75         git_config(git_default_config);
76
77         newfd = hold_locked_index(&lock_file, 1);
78         if (read_cache() < 0)
79                 die("index file corrupt");
80
81         for (i = 1; i < argc; i++) {
82                 const char *arg = argv[i];
83
84                 if (arg[0] != '-')
85                         break;
86                 if (!strcmp(arg, "--")) {
87                         i++;
88                         break;
89                 }
90                 if (!strcmp(arg, "-n")) {
91                         show_only = 1;
92                         continue;
93                 }
94                 if (!strcmp(arg, "-f")) {
95                         force = 1;
96                         continue;
97                 }
98                 if (!strcmp(arg, "-k")) {
99                         ignore_errors = 1;
100                         continue;
101                 }
102                 usage(builtin_mv_usage);
103         }
104         count = argc - i - 1;
105         if (count < 1)
106                 usage(builtin_mv_usage);
107
108         source = copy_pathspec(prefix, argv + i, count, 0);
109         modes = xcalloc(count, sizeof(enum update_mode));
110         dest_path = copy_pathspec(prefix, argv + argc - 1, 1, 0);
111
112         if (dest_path[0][0] == '\0')
113                 /* special case: "." was normalized to "" */
114                 destination = copy_pathspec(dest_path[0], argv + i, count, 1);
115         else if (!lstat(dest_path[0], &st) &&
116                         S_ISDIR(st.st_mode)) {
117                 dest_path[0] = add_slash(dest_path[0]);
118                 destination = copy_pathspec(dest_path[0], argv + i, count, 1);
119         } else {
120                 if (count != 1)
121                         usage(builtin_mv_usage);
122                 destination = dest_path;
123         }
124
125         /* Checking */
126         for (i = 0; i < count; i++) {
127                 const char *src = source[i], *dst = destination[i];
128                 int length, src_is_dir;
129                 const char *bad = NULL;
130
131                 if (show_only)
132                         printf("Checking rename of '%s' to '%s'\n", src, dst);
133
134                 length = strlen(src);
135                 if (lstat(src, &st) < 0)
136                         bad = "bad source";
137                 else if (!strncmp(src, dst, length) &&
138                                 (dst[length] == 0 || dst[length] == '/')) {
139                         bad = "can not move directory into itself";
140                 } else if ((src_is_dir = S_ISDIR(st.st_mode))
141                                 && lstat(dst, &st) == 0)
142                         bad = "cannot move directory over file";
143                 else if (src_is_dir) {
144                         const char *src_w_slash = add_slash(src);
145                         int len_w_slash = length + 1;
146                         int first, last;
147
148                         modes[i] = WORKING_DIRECTORY;
149
150                         first = cache_name_pos(src_w_slash, len_w_slash);
151                         if (first >= 0)
152                                 die ("Huh? %.*s is in index?",
153                                                 len_w_slash, src_w_slash);
154
155                         first = -1 - first;
156                         for (last = first; last < active_nr; last++) {
157                                 const char *path = active_cache[last]->name;
158                                 if (strncmp(path, src_w_slash, len_w_slash))
159                                         break;
160                         }
161                         free((char *)src_w_slash);
162
163                         if (last - first < 1)
164                                 bad = "source directory is empty";
165                         else {
166                                 int j, dst_len;
167
168                                 if (last - first > 0) {
169                                         source = xrealloc(source,
170                                                         (count + last - first)
171                                                         * sizeof(char *));
172                                         destination = xrealloc(destination,
173                                                         (count + last - first)
174                                                         * sizeof(char *));
175                                         modes = xrealloc(modes,
176                                                         (count + last - first)
177                                                         * sizeof(enum update_mode));
178                                 }
179
180                                 dst = add_slash(dst);
181                                 dst_len = strlen(dst) - 1;
182
183                                 for (j = 0; j < last - first; j++) {
184                                         const char *path =
185                                                 active_cache[first + j]->name;
186                                         source[count + j] = path;
187                                         destination[count + j] =
188                                                 prefix_path(dst, dst_len,
189                                                         path + length);
190                                         modes[count + j] = INDEX;
191                                 }
192                                 count += last - first;
193                         }
194                 } else if (lstat(dst, &st) == 0) {
195                         bad = "destination exists";
196                         if (force) {
197                                 /*
198                                  * only files can overwrite each other:
199                                  * check both source and destination
200                                  */
201                                 if (S_ISREG(st.st_mode)) {
202                                         fprintf(stderr, "Warning: %s;"
203                                                         " will overwrite!\n",
204                                                         bad);
205                                         bad = NULL;
206                                         path_list_insert(dst, &overwritten);
207                                 } else
208                                         bad = "Cannot overwrite";
209                         }
210                 } else if (cache_name_pos(src, length) < 0)
211                         bad = "not under version control";
212                 else if (path_list_has_path(&src_for_dst, dst))
213                         bad = "multiple sources for the same target";
214                 else
215                         path_list_insert(dst, &src_for_dst);
216
217                 if (bad) {
218                         if (ignore_errors) {
219                                 if (--count > 0) {
220                                         memmove(source + i, source + i + 1,
221                                                 (count - i) * sizeof(char *));
222                                         memmove(destination + i,
223                                                 destination + i + 1,
224                                                 (count - i) * sizeof(char *));
225                                 }
226                         } else
227                                 die ("%s, source=%s, destination=%s",
228                                      bad, src, dst);
229                 }
230         }
231
232         for (i = 0; i < count; i++) {
233                 const char *src = source[i], *dst = destination[i];
234                 enum update_mode mode = modes[i];
235                 if (show_only || verbose)
236                         printf("Renaming %s to %s\n", src, dst);
237                 if (!show_only && mode != INDEX &&
238                                 rename(src, dst) < 0 && !ignore_errors)
239                         die ("renaming %s failed: %s", src, strerror(errno));
240
241                 if (mode == WORKING_DIRECTORY)
242                         continue;
243
244                 if (cache_name_pos(src, strlen(src)) >= 0) {
245                         path_list_insert(src, &deleted);
246
247                         /* destination can be a directory with 1 file inside */
248                         if (path_list_has_path(&overwritten, dst))
249                                 path_list_insert(dst, &changed);
250                         else
251                                 path_list_insert(dst, &added);
252                 } else
253                         path_list_insert(dst, &added);
254         }
255
256         if (show_only) {
257                 show_list("Changed  : ", &changed);
258                 show_list("Adding   : ", &added);
259                 show_list("Deleting : ", &deleted);
260         } else {
261                 for (i = 0; i < changed.nr; i++) {
262                         const char *path = changed.items[i].path;
263                         int j = cache_name_pos(path, strlen(path));
264                         struct cache_entry *ce = active_cache[j];
265
266                         if (j < 0)
267                                 die ("Huh? Cache entry for %s unknown?", path);
268                         refresh_cache_entry(ce, 0);
269                 }
270
271                 for (i = 0; i < added.nr; i++) {
272                         const char *path = added.items[i].path;
273                         add_file_to_cache(path, verbose);
274                 }
275
276                 for (i = 0; i < deleted.nr; i++)
277                         remove_file_from_cache(deleted.items[i].path);
278
279                 if (active_cache_changed) {
280                         if (write_cache(newfd, active_cache, active_nr) ||
281                             close(newfd) ||
282                             commit_locked_index(&lock_file))
283                                 die("Unable to write new index file");
284                 }
285         }
286
287         return 0;
288 }