Merge branch 'mg/reset-doc'
[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 "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 }