Merge branch 'jc/autogc'
[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                         char *without_slash = xmalloc(length);
26                         memcpy(without_slash, result[i], length - 1);
27                         without_slash[length - 1] = '\0';
28                         result[i] = without_slash;
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 void show_list(const char *label, struct path_list *list)
40 {
41         if (list->nr > 0) {
42                 int i;
43                 printf("%s", label);
44                 for (i = 0; i < list->nr; i++)
45                         printf("%s%s", i > 0 ? ", " : "", list->items[i].path);
46                 putchar('\n');
47         }
48 }
49
50 static const char *add_slash(const char *path)
51 {
52         int len = strlen(path);
53         if (path[len - 1] != '/') {
54                 char *with_slash = xmalloc(len + 2);
55                 memcpy(with_slash, path, len);
56                 with_slash[len++] = '/';
57                 with_slash[len] = 0;
58                 return with_slash;
59         }
60         return path;
61 }
62
63 static struct lock_file lock_file;
64
65 int cmd_mv(int argc, const char **argv, const char *prefix)
66 {
67         int i, newfd, count;
68         int verbose = 0, show_only = 0, force = 0, ignore_errors = 0;
69         const char **source, **destination, **dest_path;
70         enum update_mode { BOTH = 0, WORKING_DIRECTORY, INDEX } *modes;
71         struct stat st;
72         struct path_list overwritten = {NULL, 0, 0, 0};
73         struct path_list src_for_dst = {NULL, 0, 0, 0};
74         struct path_list added = {NULL, 0, 0, 0};
75         struct path_list deleted = {NULL, 0, 0, 0};
76         struct path_list changed = {NULL, 0, 0, 0};
77
78         git_config(git_default_config);
79
80         newfd = hold_locked_index(&lock_file, 1);
81         if (read_cache() < 0)
82                 die("index file corrupt");
83
84         for (i = 1; i < argc; i++) {
85                 const char *arg = argv[i];
86
87                 if (arg[0] != '-')
88                         break;
89                 if (!strcmp(arg, "--")) {
90                         i++;
91                         break;
92                 }
93                 if (!strcmp(arg, "-n")) {
94                         show_only = 1;
95                         continue;
96                 }
97                 if (!strcmp(arg, "-f")) {
98                         force = 1;
99                         continue;
100                 }
101                 if (!strcmp(arg, "-k")) {
102                         ignore_errors = 1;
103                         continue;
104                 }
105                 usage(builtin_mv_usage);
106         }
107         count = argc - i - 1;
108         if (count < 1)
109                 usage(builtin_mv_usage);
110
111         source = copy_pathspec(prefix, argv + i, count, 0);
112         modes = xcalloc(count, sizeof(enum update_mode));
113         dest_path = copy_pathspec(prefix, argv + argc - 1, 1, 0);
114
115         if (dest_path[0][0] == '\0')
116                 /* special case: "." was normalized to "" */
117                 destination = copy_pathspec(dest_path[0], argv + i, count, 1);
118         else if (!lstat(dest_path[0], &st) &&
119                         S_ISDIR(st.st_mode)) {
120                 dest_path[0] = add_slash(dest_path[0]);
121                 destination = copy_pathspec(dest_path[0], argv + i, count, 1);
122         } else {
123                 if (count != 1)
124                         usage(builtin_mv_usage);
125                 destination = dest_path;
126         }
127
128         /* Checking */
129         for (i = 0; i < count; i++) {
130                 const char *src = source[i], *dst = destination[i];
131                 int length, src_is_dir;
132                 const char *bad = NULL;
133
134                 if (show_only)
135                         printf("Checking rename of '%s' to '%s'\n", src, dst);
136
137                 length = strlen(src);
138                 if (lstat(src, &st) < 0)
139                         bad = "bad source";
140                 else if (!strncmp(src, dst, length) &&
141                                 (dst[length] == 0 || dst[length] == '/')) {
142                         bad = "can not move directory into itself";
143                 } else if ((src_is_dir = S_ISDIR(st.st_mode))
144                                 && lstat(dst, &st) == 0)
145                         bad = "cannot move directory over file";
146                 else if (src_is_dir) {
147                         const char *src_w_slash = add_slash(src);
148                         int len_w_slash = length + 1;
149                         int first, last;
150
151                         modes[i] = WORKING_DIRECTORY;
152
153                         first = cache_name_pos(src_w_slash, len_w_slash);
154                         if (first >= 0)
155                                 die ("Huh? %.*s is in index?",
156                                                 len_w_slash, src_w_slash);
157
158                         first = -1 - first;
159                         for (last = first; last < active_nr; last++) {
160                                 const char *path = active_cache[last]->name;
161                                 if (strncmp(path, src_w_slash, len_w_slash))
162                                         break;
163                         }
164                         free((char *)src_w_slash);
165
166                         if (last - first < 1)
167                                 bad = "source directory is empty";
168                         else {
169                                 int j, dst_len;
170
171                                 if (last - first > 0) {
172                                         source = xrealloc(source,
173                                                         (count + last - first)
174                                                         * sizeof(char *));
175                                         destination = xrealloc(destination,
176                                                         (count + last - first)
177                                                         * sizeof(char *));
178                                         modes = xrealloc(modes,
179                                                         (count + last - first)
180                                                         * sizeof(enum update_mode));
181                                 }
182
183                                 dst = add_slash(dst);
184                                 dst_len = strlen(dst) - 1;
185
186                                 for (j = 0; j < last - first; j++) {
187                                         const char *path =
188                                                 active_cache[first + j]->name;
189                                         source[count + j] = path;
190                                         destination[count + j] =
191                                                 prefix_path(dst, dst_len,
192                                                         path + length);
193                                         modes[count + j] = INDEX;
194                                 }
195                                 count += last - first;
196                         }
197                 } else if (lstat(dst, &st) == 0) {
198                         bad = "destination exists";
199                         if (force) {
200                                 /*
201                                  * only files can overwrite each other:
202                                  * check both source and destination
203                                  */
204                                 if (S_ISREG(st.st_mode)) {
205                                         fprintf(stderr, "Warning: %s;"
206                                                         " will overwrite!\n",
207                                                         bad);
208                                         bad = NULL;
209                                         path_list_insert(dst, &overwritten);
210                                 } else
211                                         bad = "Cannot overwrite";
212                         }
213                 } else if (cache_name_pos(src, length) < 0)
214                         bad = "not under version control";
215                 else if (path_list_has_path(&src_for_dst, dst))
216                         bad = "multiple sources for the same target";
217                 else
218                         path_list_insert(dst, &src_for_dst);
219
220                 if (bad) {
221                         if (ignore_errors) {
222                                 if (--count > 0) {
223                                         memmove(source + i, source + i + 1,
224                                                 (count - i) * sizeof(char *));
225                                         memmove(destination + i,
226                                                 destination + i + 1,
227                                                 (count - i) * sizeof(char *));
228                                 }
229                         } else
230                                 die ("%s, source=%s, destination=%s",
231                                      bad, src, dst);
232                 }
233         }
234
235         for (i = 0; i < count; i++) {
236                 const char *src = source[i], *dst = destination[i];
237                 enum update_mode mode = modes[i];
238                 if (show_only || verbose)
239                         printf("Renaming %s to %s\n", src, dst);
240                 if (!show_only && mode != INDEX &&
241                                 rename(src, dst) < 0 && !ignore_errors)
242                         die ("renaming %s failed: %s", src, strerror(errno));
243
244                 if (mode == WORKING_DIRECTORY)
245                         continue;
246
247                 if (cache_name_pos(src, strlen(src)) >= 0) {
248                         path_list_insert(src, &deleted);
249
250                         /* destination can be a directory with 1 file inside */
251                         if (path_list_has_path(&overwritten, dst))
252                                 path_list_insert(dst, &changed);
253                         else
254                                 path_list_insert(dst, &added);
255                 } else
256                         path_list_insert(dst, &added);
257         }
258
259         if (show_only) {
260                 show_list("Changed  : ", &changed);
261                 show_list("Adding   : ", &added);
262                 show_list("Deleting : ", &deleted);
263         } else {
264                 for (i = 0; i < changed.nr; i++) {
265                         const char *path = changed.items[i].path;
266                         int j = cache_name_pos(path, strlen(path));
267                         struct cache_entry *ce = active_cache[j];
268
269                         if (j < 0)
270                                 die ("Huh? Cache entry for %s unknown?", path);
271                         refresh_cache_entry(ce, 0);
272                 }
273
274                 for (i = 0; i < added.nr; i++) {
275                         const char *path = added.items[i].path;
276                         add_file_to_cache(path, verbose);
277                 }
278
279                 for (i = 0; i < deleted.nr; i++)
280                         remove_file_from_cache(deleted.items[i].path);
281
282                 if (active_cache_changed) {
283                         if (write_cache(newfd, active_cache, active_nr) ||
284                             close(newfd) ||
285                             commit_locked_index(&lock_file))
286                                 die("Unable to write new index file");
287                 }
288         }
289
290         return 0;
291 }