Merge branch 'sp/checkout'
[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
43 #define CHECKOUT_ALL 4
44 static const char *prefix;
45 static int prefix_length;
46 static int line_termination = '\n';
47 static int checkout_stage; /* default to checkout stage0 */
48 static int to_tempfile;
49 static char topath[4][MAXPATHLEN+1];
50
51 static struct checkout state = {
52         .base_dir = "",
53         .base_dir_len = 0,
54         .force = 0,
55         .quiet = 0,
56         .not_new = 0,
57         .refresh_cache = 0,
58 };
59
60 static void write_tempfile_record (const char *name)
61 {
62         int i;
63
64         if (CHECKOUT_ALL == checkout_stage) {
65                 for (i = 1; i < 4; i++) {
66                         if (i > 1)
67                                 putchar(' ');
68                         if (topath[i][0])
69                                 fputs(topath[i], stdout);
70                         else
71                                 putchar('.');
72                 }
73         } else
74                 fputs(topath[checkout_stage], stdout);
75
76         putchar('\t');
77         write_name_quoted("", 0, name + prefix_length,
78                 line_termination, stdout);
79         putchar(line_termination);
80
81         for (i = 0; i < 4; i++) {
82                 topath[i][0] = 0;
83         }
84 }
85
86 static int checkout_file(const char *name)
87 {
88         int namelen = strlen(name);
89         int pos = cache_name_pos(name, namelen);
90         int has_same_name = 0;
91         int did_checkout = 0;
92         int errs = 0;
93
94         if (pos < 0)
95                 pos = -pos - 1;
96
97         while (pos < active_nr) {
98                 struct cache_entry *ce = active_cache[pos];
99                 if (ce_namelen(ce) != namelen ||
100                     memcmp(ce->name, name, namelen))
101                         break;
102                 has_same_name = 1;
103                 pos++;
104                 if (ce_stage(ce) != checkout_stage
105                     && (CHECKOUT_ALL != checkout_stage || !ce_stage(ce)))
106                         continue;
107                 did_checkout = 1;
108                 if (checkout_entry(ce, &state,
109                     to_tempfile ? topath[ce_stage(ce)] : NULL) < 0)
110                         errs++;
111         }
112
113         if (did_checkout) {
114                 if (to_tempfile)
115                         write_tempfile_record(name);
116                 return errs > 0 ? -1 : 0;
117         }
118
119         if (!state.quiet) {
120                 fprintf(stderr, "git-checkout-index: %s ", name);
121                 if (!has_same_name)
122                         fprintf(stderr, "is not in the cache");
123                 else if (checkout_stage)
124                         fprintf(stderr, "does not exist at stage %d",
125                                 checkout_stage);
126                 else
127                         fprintf(stderr, "is unmerged");
128                 fputc('\n', stderr);
129         }
130         return -1;
131 }
132
133 static int checkout_all(void)
134 {
135         int i, errs = 0;
136         struct cache_entry* last_ce = 0;
137
138         for (i = 0; i < active_nr ; i++) {
139                 struct cache_entry *ce = active_cache[i];
140                 if (ce_stage(ce) != checkout_stage
141                     && (CHECKOUT_ALL != checkout_stage || !ce_stage(ce)))
142                         continue;
143                 if (prefix && *prefix &&
144                     (ce_namelen(ce) <= prefix_length ||
145                      memcmp(prefix, ce->name, prefix_length)))
146                         continue;
147                 if (last_ce && to_tempfile) {
148                         if (ce_namelen(last_ce) != ce_namelen(ce)
149                             || memcmp(last_ce->name, ce->name, ce_namelen(ce)))
150                                 write_tempfile_record(last_ce->name);
151                 }
152                 if (checkout_entry(ce, &state,
153                     to_tempfile ? topath[ce_stage(ce)] : NULL) < 0)
154                         errs++;
155                 last_ce = ce;
156         }
157         if (last_ce && to_tempfile)
158                 write_tempfile_record(last_ce->name);
159         if (errs)
160                 /* we have already done our error reporting.
161                  * exit with the same code as die().
162                  */
163                 exit(128);
164         return 0;
165 }
166
167 static const char checkout_cache_usage[] =
168 "git-checkout-index [-u] [-q] [-a] [-f] [-n] [--stage=[123]|all] [--prefix=<string>] [--temp] [--] <file>...";
169
170 static struct cache_file cache_file;
171
172 int main(int argc, char **argv)
173 {
174         int i;
175         int newfd = -1;
176         int all = 0;
177         int read_from_stdin = 0;
178
179         prefix = setup_git_directory();
180         git_config(git_default_config);
181         prefix_length = prefix ? strlen(prefix) : 0;
182
183         if (read_cache() < 0) {
184                 die("invalid cache");
185         }
186
187         for (i = 1; i < argc; i++) {
188                 const char *arg = argv[i];
189
190                 if (!strcmp(arg, "--")) {
191                         i++;
192                         break;
193                 }
194                 if (!strcmp(arg, "-a") || !strcmp(arg, "--all")) {
195                         all = 1;
196                         continue;
197                 }
198                 if (!strcmp(arg, "-f") || !strcmp(arg, "--force")) {
199                         state.force = 1;
200                         continue;
201                 }
202                 if (!strcmp(arg, "-q") || !strcmp(arg, "--quiet")) {
203                         state.quiet = 1;
204                         continue;
205                 }
206                 if (!strcmp(arg, "-n") || !strcmp(arg, "--no-create")) {
207                         state.not_new = 1;
208                         continue;
209                 }
210                 if (!strcmp(arg, "-u") || !strcmp(arg, "--index")) {
211                         state.refresh_cache = 1;
212                         if (newfd < 0)
213                                 newfd = hold_index_file_for_update
214                                         (&cache_file,
215                                          get_index_file());
216                         if (newfd < 0)
217                                 die("cannot open index.lock file.");
218                         continue;
219                 }
220                 if (!strcmp(arg, "-z")) {
221                         line_termination = 0;
222                         continue;
223                 }
224                 if (!strcmp(arg, "--stdin")) {
225                         if (i != argc - 1)
226                                 die("--stdin must be at the end");
227                         read_from_stdin = 1;
228                         i++; /* do not consider arg as a file name */
229                         break;
230                 }
231                 if (!strcmp(arg, "--temp")) {
232                         to_tempfile = 1;
233                         continue;
234                 }
235                 if (!strncmp(arg, "--prefix=", 9)) {
236                         state.base_dir = arg+9;
237                         state.base_dir_len = strlen(state.base_dir);
238                         continue;
239                 }
240                 if (!strncmp(arg, "--stage=", 8)) {
241                         if (!strcmp(arg + 8, "all")) {
242                                 to_tempfile = 1;
243                                 checkout_stage = CHECKOUT_ALL;
244                         } else {
245                                 int ch = arg[8];
246                                 if ('1' <= ch && ch <= '3')
247                                         checkout_stage = arg[8] - '0';
248                                 else
249                                         die("stage should be between 1 and 3 or all");
250                         }
251                         continue;
252                 }
253                 if (arg[0] == '-')
254                         usage(checkout_cache_usage);
255                 break;
256         }
257
258         if (state.base_dir_len || to_tempfile) {
259                 /* when --prefix is specified we do not
260                  * want to update cache.
261                  */
262                 if (state.refresh_cache) {
263                         close(newfd); newfd = -1;
264                         rollback_index_file(&cache_file);
265                 }
266                 state.refresh_cache = 0;
267         }
268
269         /* Check out named files first */
270         for ( ; i < argc; i++) {
271                 const char *arg = argv[i];
272
273                 if (all)
274                         die("git-checkout-index: don't mix '--all' and explicit filenames");
275                 if (read_from_stdin)
276                         die("git-checkout-index: don't mix '--stdin' and explicit filenames");
277                 checkout_file(prefix_path(prefix, prefix_length, arg));
278         }
279
280         if (read_from_stdin) {
281                 struct strbuf buf;
282                 if (all)
283                         die("git-checkout-index: don't mix '--all' and '--stdin'");
284                 strbuf_init(&buf);
285                 while (1) {
286                         char *path_name;
287                         read_line(&buf, stdin, line_termination);
288                         if (buf.eof)
289                                 break;
290                         if (line_termination && buf.buf[0] == '"')
291                                 path_name = unquote_c_style(buf.buf, NULL);
292                         else
293                                 path_name = buf.buf;
294                         checkout_file(prefix_path(prefix, prefix_length, path_name));
295                         if (path_name != buf.buf)
296                                 free(path_name);
297                 }
298         }
299
300         if (all)
301                 checkout_all();
302
303         if (0 <= newfd &&
304             (write_cache(newfd, active_cache, active_nr) ||
305              commit_index_file(&cache_file)))
306                 die("Unable to write new cachefile");
307         return 0;
308 }