read-cache.c: use xcalloc() not calloc()
[git/git.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 = NULL;
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 }