Fix a bug in email extraction used in git-send-email.
[git] / checkout-index.c
1 /*
2  * Check-out files from the "current cache directory"
3  *
4  * Copyright (C) 2005 Linus Torvalds
5  *
6  * Careful: order of argument flags does matter. For example,
7  *
8  *      git-checkout-index -a -f file.c
9  *
10  * Will first check out all files listed in the cache (but not
11  * overwrite any old ones), and then force-checkout "file.c" a
12  * second time (ie that one _will_ overwrite any old contents
13  * with the same filename).
14  *
15  * Also, just doing "git-checkout-index" does nothing. You probably
16  * meant "git-checkout-index -a". And if you want to force it, you
17  * want "git-checkout-index -f -a".
18  *
19  * Intuitiveness is not the goal here. Repeatability is. The
20  * reason for the "no arguments means no work" thing is that
21  * from scripts you are supposed to be able to do things like
22  *
23  *      find . -name '*.h' -print0 | xargs -0 git-checkout-index -f --
24  *
25  * or:
26  *
27  *      find . -name '*.h' -print0 | git-checkout-index -f -z --stdin
28  *
29  * which will force all existing *.h files to be replaced with
30  * their cached copies. If an empty command line implied "all",
31  * then this would force-refresh everything in the cache, which
32  * was not the point.
33  *
34  * Oh, and the "--" is just a good idea when you know the rest
35  * will be filenames. Just so that you wouldn't have a filename
36  * of "-a" causing problems (not possible in the above example,
37  * but get used to it in scripting!).
38  */
39 #include "cache.h"
40 #include "strbuf.h"
41 #include "quote.h"
42 #include "cache-tree.h"
43
44 #define CHECKOUT_ALL 4
45 static const char *prefix;
46 static int prefix_length;
47 static int line_termination = '\n';
48 static int checkout_stage; /* default to checkout stage0 */
49 static int to_tempfile;
50 static char topath[4][MAXPATHLEN+1];
51
52 static struct checkout state = {
53         .base_dir = "",
54         .base_dir_len = 0,
55         .force = 0,
56         .quiet = 0,
57         .not_new = 0,
58         .refresh_cache = 0,
59 };
60
61 static void write_tempfile_record (const char *name)
62 {
63         int i;
64
65         if (CHECKOUT_ALL == checkout_stage) {
66                 for (i = 1; i < 4; i++) {
67                         if (i > 1)
68                                 putchar(' ');
69                         if (topath[i][0])
70                                 fputs(topath[i], stdout);
71                         else
72                                 putchar('.');
73                 }
74         } else
75                 fputs(topath[checkout_stage], stdout);
76
77         putchar('\t');
78         write_name_quoted("", 0, name + prefix_length,
79                 line_termination, stdout);
80         putchar(line_termination);
81
82         for (i = 0; i < 4; i++) {
83                 topath[i][0] = 0;
84         }
85 }
86
87 static int checkout_file(const char *name)
88 {
89         int namelen = strlen(name);
90         int pos = cache_name_pos(name, namelen);
91         int has_same_name = 0;
92         int did_checkout = 0;
93         int errs = 0;
94
95         if (pos < 0)
96                 pos = -pos - 1;
97
98         while (pos < active_nr) {
99                 struct cache_entry *ce = active_cache[pos];
100                 if (ce_namelen(ce) != namelen ||
101                     memcmp(ce->name, name, namelen))
102                         break;
103                 has_same_name = 1;
104                 pos++;
105                 if (ce_stage(ce) != checkout_stage
106                     && (CHECKOUT_ALL != checkout_stage || !ce_stage(ce)))
107                         continue;
108                 did_checkout = 1;
109                 if (checkout_entry(ce, &state,
110                     to_tempfile ? topath[ce_stage(ce)] : NULL) < 0)
111                         errs++;
112         }
113
114         if (did_checkout) {
115                 if (to_tempfile)
116                         write_tempfile_record(name);
117                 return errs > 0 ? -1 : 0;
118         }
119
120         if (!state.quiet) {
121                 fprintf(stderr, "git-checkout-index: %s ", name);
122                 if (!has_same_name)
123                         fprintf(stderr, "is not in the cache");
124                 else if (checkout_stage)
125                         fprintf(stderr, "does not exist at stage %d",
126                                 checkout_stage);
127                 else
128                         fprintf(stderr, "is unmerged");
129                 fputc('\n', stderr);
130         }
131         return -1;
132 }
133
134 static int checkout_all(void)
135 {
136         int i, errs = 0;
137         struct cache_entry* last_ce = NULL;
138
139         for (i = 0; i < active_nr ; i++) {
140                 struct cache_entry *ce = active_cache[i];
141                 if (ce_stage(ce) != checkout_stage
142                     && (CHECKOUT_ALL != checkout_stage || !ce_stage(ce)))
143                         continue;
144                 if (prefix && *prefix &&
145                     (ce_namelen(ce) <= prefix_length ||
146                      memcmp(prefix, ce->name, prefix_length)))
147                         continue;
148                 if (last_ce && to_tempfile) {
149                         if (ce_namelen(last_ce) != ce_namelen(ce)
150                             || memcmp(last_ce->name, ce->name, ce_namelen(ce)))
151                                 write_tempfile_record(last_ce->name);
152                 }
153                 if (checkout_entry(ce, &state,
154                     to_tempfile ? topath[ce_stage(ce)] : NULL) < 0)
155                         errs++;
156                 last_ce = ce;
157         }
158         if (last_ce && to_tempfile)
159                 write_tempfile_record(last_ce->name);
160         if (errs)
161                 /* we have already done our error reporting.
162                  * exit with the same code as die().
163                  */
164                 exit(128);
165         return 0;
166 }
167
168 static const char checkout_cache_usage[] =
169 "git-checkout-index [-u] [-q] [-a] [-f] [-n] [--stage=[123]|all] [--prefix=<string>] [--temp] [--] <file>...";
170
171 static struct cache_file cache_file;
172
173 int main(int argc, char **argv)
174 {
175         int i;
176         int newfd = -1;
177         int all = 0;
178         int read_from_stdin = 0;
179
180         prefix = setup_git_directory();
181         git_config(git_default_config);
182         prefix_length = prefix ? strlen(prefix) : 0;
183
184         if (read_cache() < 0) {
185                 die("invalid cache");
186         }
187
188         for (i = 1; i < argc; i++) {
189                 const char *arg = argv[i];
190
191                 if (!strcmp(arg, "--")) {
192                         i++;
193                         break;
194                 }
195                 if (!strcmp(arg, "-a") || !strcmp(arg, "--all")) {
196                         all = 1;
197                         continue;
198                 }
199                 if (!strcmp(arg, "-f") || !strcmp(arg, "--force")) {
200                         state.force = 1;
201                         continue;
202                 }
203                 if (!strcmp(arg, "-q") || !strcmp(arg, "--quiet")) {
204                         state.quiet = 1;
205                         continue;
206                 }
207                 if (!strcmp(arg, "-n") || !strcmp(arg, "--no-create")) {
208                         state.not_new = 1;
209                         continue;
210                 }
211                 if (!strcmp(arg, "-u") || !strcmp(arg, "--index")) {
212                         state.refresh_cache = 1;
213                         if (newfd < 0)
214                                 newfd = hold_index_file_for_update
215                                         (&cache_file,
216                                          get_index_file());
217                         if (newfd < 0)
218                                 die("cannot open index.lock file.");
219                         continue;
220                 }
221                 if (!strcmp(arg, "-z")) {
222                         line_termination = 0;
223                         continue;
224                 }
225                 if (!strcmp(arg, "--stdin")) {
226                         if (i != argc - 1)
227                                 die("--stdin must be at the end");
228                         read_from_stdin = 1;
229                         i++; /* do not consider arg as a file name */
230                         break;
231                 }
232                 if (!strcmp(arg, "--temp")) {
233                         to_tempfile = 1;
234                         continue;
235                 }
236                 if (!strncmp(arg, "--prefix=", 9)) {
237                         state.base_dir = arg+9;
238                         state.base_dir_len = strlen(state.base_dir);
239                         continue;
240                 }
241                 if (!strncmp(arg, "--stage=", 8)) {
242                         if (!strcmp(arg + 8, "all")) {
243                                 to_tempfile = 1;
244                                 checkout_stage = CHECKOUT_ALL;
245                         } else {
246                                 int ch = arg[8];
247                                 if ('1' <= ch && ch <= '3')
248                                         checkout_stage = arg[8] - '0';
249                                 else
250                                         die("stage should be between 1 and 3 or all");
251                         }
252                         continue;
253                 }
254                 if (arg[0] == '-')
255                         usage(checkout_cache_usage);
256                 break;
257         }
258
259         if (state.base_dir_len || to_tempfile) {
260                 /* when --prefix is specified we do not
261                  * want to update cache.
262                  */
263                 if (state.refresh_cache) {
264                         close(newfd); newfd = -1;
265                         rollback_index_file(&cache_file);
266                 }
267                 state.refresh_cache = 0;
268         }
269
270         /* Check out named files first */
271         for ( ; i < argc; i++) {
272                 const char *arg = argv[i];
273                 const char *p;
274
275                 if (all)
276                         die("git-checkout-index: don't mix '--all' and explicit filenames");
277                 if (read_from_stdin)
278                         die("git-checkout-index: don't mix '--stdin' and explicit filenames");
279                 p = prefix_path(prefix, prefix_length, arg);
280                 checkout_file(p);
281                 if (p < arg || p > arg + strlen(arg))
282                         free((char*)p);
283         }
284
285         if (read_from_stdin) {
286                 struct strbuf buf;
287                 if (all)
288                         die("git-checkout-index: don't mix '--all' and '--stdin'");
289                 strbuf_init(&buf);
290                 while (1) {
291                         char *path_name;
292                         const char *p;
293
294                         read_line(&buf, stdin, line_termination);
295                         if (buf.eof)
296                                 break;
297                         if (line_termination && buf.buf[0] == '"')
298                                 path_name = unquote_c_style(buf.buf, NULL);
299                         else
300                                 path_name = buf.buf;
301                         p = prefix_path(prefix, prefix_length, path_name);
302                         checkout_file(p);
303                         if (p < path_name || p > path_name + strlen(path_name))
304                                 free((char *)p);
305                         if (path_name != buf.buf)
306                                 free(path_name);
307                 }
308         }
309
310         if (all)
311                 checkout_all();
312
313         if (0 <= newfd &&
314             (write_cache(newfd, active_cache, active_nr) ||
315              commit_index_file(&cache_file)))
316                 die("Unable to write new cachefile");
317         return 0;
318 }