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[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                 if (length > 0 && result[i][length - 1] == '/') {
28                         result[i] = xmemdupz(result[i], length - 1);
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 const char *add_slash(const char *path)
40 {
41         int len = strlen(path);
42         if (path[len - 1] != '/') {
43                 char *with_slash = xmalloc(len + 2);
44                 memcpy(with_slash, path, len);
45                 with_slash[len++] = '/';
46                 with_slash[len] = 0;
47                 return with_slash;
48         }
49         return path;
50 }
51
52 static struct lock_file lock_file;
53
54 int cmd_mv(int argc, const char **argv, const char *prefix)
55 {
56         int i, newfd;
57         int verbose = 0, show_only = 0, force = 0, ignore_errors = 0;
58         struct option builtin_mv_options[] = {
59                 OPT__DRY_RUN(&show_only),
60                 OPT_BOOLEAN('f', NULL, &force, "force move/rename even if target exists"),
61                 OPT_BOOLEAN('k', NULL, &ignore_errors, "skip move/rename errors"),
62                 OPT_END(),
63         };
64         const char **source, **destination, **dest_path;
65         enum update_mode { BOTH = 0, WORKING_DIRECTORY, INDEX } *modes;
66         struct stat st;
67         struct string_list src_for_dst = {NULL, 0, 0, 0};
68
69         git_config(git_default_config, NULL);
70
71         newfd = hold_locked_index(&lock_file, 1);
72         if (read_cache() < 0)
73                 die("index file corrupt");
74
75         argc = parse_options(argc, argv, prefix, builtin_mv_options,
76                              builtin_mv_usage, 0);
77         if (--argc < 1)
78                 usage_with_options(builtin_mv_usage, builtin_mv_options);
79
80         source = copy_pathspec(prefix, argv, argc, 0);
81         modes = xcalloc(argc, sizeof(enum update_mode));
82         dest_path = copy_pathspec(prefix, argv + argc, 1, 0);
83
84         if (dest_path[0][0] == '\0')
85                 /* special case: "." was normalized to "" */
86                 destination = copy_pathspec(dest_path[0], argv, argc, 1);
87         else if (!lstat(dest_path[0], &st) &&
88                         S_ISDIR(st.st_mode)) {
89                 dest_path[0] = add_slash(dest_path[0]);
90                 destination = copy_pathspec(dest_path[0], argv, argc, 1);
91         } else {
92                 if (argc != 1)
93                         usage_with_options(builtin_mv_usage, builtin_mv_options);
94                 destination = dest_path;
95         }
96
97         /* Checking */
98         for (i = 0; i < argc; i++) {
99                 const char *src = source[i], *dst = destination[i];
100                 int length, src_is_dir;
101                 const char *bad = NULL;
102
103                 if (show_only)
104                         printf("Checking rename of '%s' to '%s'\n", src, dst);
105
106                 length = strlen(src);
107                 if (lstat(src, &st) < 0)
108                         bad = "bad source";
109                 else if (!strncmp(src, dst, length) &&
110                                 (dst[length] == 0 || dst[length] == '/')) {
111                         bad = "can not move directory into itself";
112                 } else if ((src_is_dir = S_ISDIR(st.st_mode))
113                                 && lstat(dst, &st) == 0)
114                         bad = "cannot move directory over file";
115                 else if (src_is_dir) {
116                         const char *src_w_slash = add_slash(src);
117                         int len_w_slash = length + 1;
118                         int first, last;
119
120                         modes[i] = WORKING_DIRECTORY;
121
122                         first = cache_name_pos(src_w_slash, len_w_slash);
123                         if (first >= 0)
124                                 die ("Huh? %.*s is in index?",
125                                                 len_w_slash, src_w_slash);
126
127                         first = -1 - first;
128                         for (last = first; last < active_nr; last++) {
129                                 const char *path = active_cache[last]->name;
130                                 if (strncmp(path, src_w_slash, len_w_slash))
131                                         break;
132                         }
133                         free((char *)src_w_slash);
134
135                         if (last - first < 1)
136                                 bad = "source directory is empty";
137                         else {
138                                 int j, dst_len;
139
140                                 if (last - first > 0) {
141                                         source = xrealloc(source,
142                                                         (argc + last - first)
143                                                         * sizeof(char *));
144                                         destination = xrealloc(destination,
145                                                         (argc + last - first)
146                                                         * sizeof(char *));
147                                         modes = xrealloc(modes,
148                                                         (argc + last - first)
149                                                         * sizeof(enum update_mode));
150                                 }
151
152                                 dst = add_slash(dst);
153                                 dst_len = strlen(dst);
154
155                                 for (j = 0; j < last - first; j++) {
156                                         const char *path =
157                                                 active_cache[first + j]->name;
158                                         source[argc + j] = path;
159                                         destination[argc + j] =
160                                                 prefix_path(dst, dst_len,
161                                                         path + length + 1);
162                                         modes[argc + j] = INDEX;
163                                 }
164                                 argc += last - first;
165                         }
166                 } else if (cache_name_pos(src, length) < 0)
167                         bad = "not under version control";
168                 else if (lstat(dst, &st) == 0) {
169                         bad = "destination exists";
170                         if (force) {
171                                 /*
172                                  * only files can overwrite each other:
173                                  * check both source and destination
174                                  */
175                                 if (S_ISREG(st.st_mode) || S_ISLNK(st.st_mode)) {
176                                         fprintf(stderr, "Warning: %s;"
177                                                         " will overwrite!\n",
178                                                         bad);
179                                         bad = NULL;
180                                 } else
181                                         bad = "Cannot overwrite";
182                         }
183                 } else if (string_list_has_string(&src_for_dst, dst))
184                         bad = "multiple sources for the same target";
185                 else
186                         string_list_insert(dst, &src_for_dst);
187
188                 if (bad) {
189                         if (ignore_errors) {
190                                 if (--argc > 0) {
191                                         memmove(source + i, source + i + 1,
192                                                 (argc - i) * sizeof(char *));
193                                         memmove(destination + i,
194                                                 destination + i + 1,
195                                                 (argc - i) * sizeof(char *));
196                                         i--;
197                                 }
198                         } else
199                                 die ("%s, source=%s, destination=%s",
200                                      bad, src, dst);
201                 }
202         }
203
204         for (i = 0; i < argc; i++) {
205                 const char *src = source[i], *dst = destination[i];
206                 enum update_mode mode = modes[i];
207                 int pos;
208                 if (show_only || verbose)
209                         printf("Renaming %s to %s\n", src, dst);
210                 if (!show_only && mode != INDEX &&
211                                 rename(src, dst) < 0 && !ignore_errors)
212                         die ("renaming %s failed: %s", src, strerror(errno));
213
214                 if (mode == WORKING_DIRECTORY)
215                         continue;
216
217                 pos = cache_name_pos(src, strlen(src));
218                 assert(pos >= 0);
219                 if (!show_only)
220                         rename_cache_entry_at(pos, dst);
221         }
222
223         if (active_cache_changed) {
224                 if (write_cache(newfd, active_cache, active_nr) ||
225                     commit_locked_index(&lock_file))
226                         die("Unable to write new index file");
227         }
228
229         return 0;
230 }