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1 | #include "cache.h" | |
2 | #include "blob.h" | |
3 | #include "dir.h" | |
4 | #include "streaming.h" | |
5 | #include "submodule.h" | |
6 | #include "progress.h" | |
7 | #include "fsmonitor.h" | |
8 | ||
9 | static void create_directories(const char *path, int path_len, | |
10 | const struct checkout *state) | |
11 | { | |
12 | char *buf = xmallocz(path_len); | |
13 | int len = 0; | |
14 | ||
15 | while (len < path_len) { | |
16 | do { | |
17 | buf[len] = path[len]; | |
18 | len++; | |
19 | } while (len < path_len && path[len] != '/'); | |
20 | if (len >= path_len) | |
21 | break; | |
22 | buf[len] = 0; | |
23 | ||
24 | /* | |
25 | * For 'checkout-index --prefix=<dir>', <dir> is | |
26 | * allowed to be a symlink to an existing directory, | |
27 | * and we set 'state->base_dir_len' below, such that | |
28 | * we test the path components of the prefix with the | |
29 | * stat() function instead of the lstat() function. | |
30 | */ | |
31 | if (has_dirs_only_path(buf, len, state->base_dir_len)) | |
32 | continue; /* ok, it is already a directory. */ | |
33 | ||
34 | /* | |
35 | * If this mkdir() would fail, it could be that there | |
36 | * is already a symlink or something else exists | |
37 | * there, therefore we then try to unlink it and try | |
38 | * one more time to create the directory. | |
39 | */ | |
40 | if (mkdir(buf, 0777)) { | |
41 | if (errno == EEXIST && state->force && | |
42 | !unlink_or_warn(buf) && !mkdir(buf, 0777)) | |
43 | continue; | |
44 | die_errno("cannot create directory at '%s'", buf); | |
45 | } | |
46 | } | |
47 | free(buf); | |
48 | } | |
49 | ||
50 | static void remove_subtree(struct strbuf *path) | |
51 | { | |
52 | DIR *dir = opendir(path->buf); | |
53 | struct dirent *de; | |
54 | int origlen = path->len; | |
55 | ||
56 | if (!dir) | |
57 | die_errno("cannot opendir '%s'", path->buf); | |
58 | while ((de = readdir(dir)) != NULL) { | |
59 | struct stat st; | |
60 | ||
61 | if (is_dot_or_dotdot(de->d_name)) | |
62 | continue; | |
63 | ||
64 | strbuf_addch(path, '/'); | |
65 | strbuf_addstr(path, de->d_name); | |
66 | if (lstat(path->buf, &st)) | |
67 | die_errno("cannot lstat '%s'", path->buf); | |
68 | if (S_ISDIR(st.st_mode)) | |
69 | remove_subtree(path); | |
70 | else if (unlink(path->buf)) | |
71 | die_errno("cannot unlink '%s'", path->buf); | |
72 | strbuf_setlen(path, origlen); | |
73 | } | |
74 | closedir(dir); | |
75 | if (rmdir(path->buf)) | |
76 | die_errno("cannot rmdir '%s'", path->buf); | |
77 | } | |
78 | ||
79 | static int create_file(const char *path, unsigned int mode) | |
80 | { | |
81 | mode = (mode & 0100) ? 0777 : 0666; | |
82 | return open(path, O_WRONLY | O_CREAT | O_EXCL, mode); | |
83 | } | |
84 | ||
85 | static void *read_blob_entry(const struct cache_entry *ce, unsigned long *size) | |
86 | { | |
87 | enum object_type type; | |
88 | void *blob_data = read_object_file(&ce->oid, &type, size); | |
89 | ||
90 | if (blob_data) { | |
91 | if (type == OBJ_BLOB) | |
92 | return blob_data; | |
93 | free(blob_data); | |
94 | } | |
95 | return NULL; | |
96 | } | |
97 | ||
98 | static int open_output_fd(char *path, const struct cache_entry *ce, int to_tempfile) | |
99 | { | |
100 | int symlink = (ce->ce_mode & S_IFMT) != S_IFREG; | |
101 | if (to_tempfile) { | |
102 | xsnprintf(path, TEMPORARY_FILENAME_LENGTH, "%s", | |
103 | symlink ? ".merge_link_XXXXXX" : ".merge_file_XXXXXX"); | |
104 | return mkstemp(path); | |
105 | } else { | |
106 | return create_file(path, !symlink ? ce->ce_mode : 0666); | |
107 | } | |
108 | } | |
109 | ||
110 | static int fstat_output(int fd, const struct checkout *state, struct stat *st) | |
111 | { | |
112 | /* use fstat() only when path == ce->name */ | |
113 | if (fstat_is_reliable() && | |
114 | state->refresh_cache && !state->base_dir_len) { | |
115 | fstat(fd, st); | |
116 | return 1; | |
117 | } | |
118 | return 0; | |
119 | } | |
120 | ||
121 | static int streaming_write_entry(const struct cache_entry *ce, char *path, | |
122 | struct stream_filter *filter, | |
123 | const struct checkout *state, int to_tempfile, | |
124 | int *fstat_done, struct stat *statbuf) | |
125 | { | |
126 | int result = 0; | |
127 | int fd; | |
128 | ||
129 | fd = open_output_fd(path, ce, to_tempfile); | |
130 | if (fd < 0) | |
131 | return -1; | |
132 | ||
133 | result |= stream_blob_to_fd(fd, &ce->oid, filter, 1); | |
134 | *fstat_done = fstat_output(fd, state, statbuf); | |
135 | result |= close(fd); | |
136 | ||
137 | if (result) | |
138 | unlink(path); | |
139 | return result; | |
140 | } | |
141 | ||
142 | void enable_delayed_checkout(struct checkout *state) | |
143 | { | |
144 | if (!state->delayed_checkout) { | |
145 | state->delayed_checkout = xmalloc(sizeof(*state->delayed_checkout)); | |
146 | state->delayed_checkout->state = CE_CAN_DELAY; | |
147 | string_list_init(&state->delayed_checkout->filters, 0); | |
148 | string_list_init(&state->delayed_checkout->paths, 0); | |
149 | } | |
150 | } | |
151 | ||
152 | static int remove_available_paths(struct string_list_item *item, void *cb_data) | |
153 | { | |
154 | struct string_list *available_paths = cb_data; | |
155 | struct string_list_item *available; | |
156 | ||
157 | available = string_list_lookup(available_paths, item->string); | |
158 | if (available) | |
159 | available->util = (void *)item->string; | |
160 | return !available; | |
161 | } | |
162 | ||
163 | int finish_delayed_checkout(struct checkout *state) | |
164 | { | |
165 | int errs = 0; | |
166 | unsigned delayed_object_count; | |
167 | off_t filtered_bytes = 0; | |
168 | struct string_list_item *filter, *path; | |
169 | struct progress *progress; | |
170 | struct delayed_checkout *dco = state->delayed_checkout; | |
171 | ||
172 | if (!state->delayed_checkout) | |
173 | return errs; | |
174 | ||
175 | dco->state = CE_RETRY; | |
176 | delayed_object_count = dco->paths.nr; | |
177 | progress = start_delayed_progress(_("Filtering content"), delayed_object_count); | |
178 | while (dco->filters.nr > 0) { | |
179 | for_each_string_list_item(filter, &dco->filters) { | |
180 | struct string_list available_paths = STRING_LIST_INIT_NODUP; | |
181 | display_progress(progress, delayed_object_count - dco->paths.nr); | |
182 | ||
183 | if (!async_query_available_blobs(filter->string, &available_paths)) { | |
184 | /* Filter reported an error */ | |
185 | errs = 1; | |
186 | filter->string = ""; | |
187 | continue; | |
188 | } | |
189 | if (available_paths.nr <= 0) { | |
190 | /* | |
191 | * Filter responded with no entries. That means | |
192 | * the filter is done and we can remove the | |
193 | * filter from the list (see | |
194 | * "string_list_remove_empty_items" call below). | |
195 | */ | |
196 | filter->string = ""; | |
197 | continue; | |
198 | } | |
199 | ||
200 | /* | |
201 | * In dco->paths we store a list of all delayed paths. | |
202 | * The filter just send us a list of available paths. | |
203 | * Remove them from the list. | |
204 | */ | |
205 | filter_string_list(&dco->paths, 0, | |
206 | &remove_available_paths, &available_paths); | |
207 | ||
208 | for_each_string_list_item(path, &available_paths) { | |
209 | struct cache_entry* ce; | |
210 | ||
211 | if (!path->util) { | |
212 | error("external filter '%s' signaled that '%s' " | |
213 | "is now available although it has not been " | |
214 | "delayed earlier", | |
215 | filter->string, path->string); | |
216 | errs |= 1; | |
217 | ||
218 | /* | |
219 | * Do not ask the filter for available blobs, | |
220 | * again, as the filter is likely buggy. | |
221 | */ | |
222 | filter->string = ""; | |
223 | continue; | |
224 | } | |
225 | ce = index_file_exists(state->istate, path->string, | |
226 | strlen(path->string), 0); | |
227 | if (ce) { | |
228 | errs |= checkout_entry(ce, state, NULL); | |
229 | filtered_bytes += ce->ce_stat_data.sd_size; | |
230 | display_throughput(progress, filtered_bytes); | |
231 | } else | |
232 | errs = 1; | |
233 | } | |
234 | } | |
235 | string_list_remove_empty_items(&dco->filters, 0); | |
236 | } | |
237 | stop_progress(&progress); | |
238 | string_list_clear(&dco->filters, 0); | |
239 | ||
240 | /* At this point we should not have any delayed paths anymore. */ | |
241 | errs |= dco->paths.nr; | |
242 | for_each_string_list_item(path, &dco->paths) { | |
243 | error("'%s' was not filtered properly", path->string); | |
244 | } | |
245 | string_list_clear(&dco->paths, 0); | |
246 | ||
247 | free(dco); | |
248 | state->delayed_checkout = NULL; | |
249 | ||
250 | return errs; | |
251 | } | |
252 | ||
253 | static int write_entry(struct cache_entry *ce, | |
254 | char *path, const struct checkout *state, int to_tempfile) | |
255 | { | |
256 | unsigned int ce_mode_s_ifmt = ce->ce_mode & S_IFMT; | |
257 | struct delayed_checkout *dco = state->delayed_checkout; | |
258 | int fd, ret, fstat_done = 0; | |
259 | char *new_blob; | |
260 | struct strbuf buf = STRBUF_INIT; | |
261 | unsigned long size; | |
262 | ssize_t wrote; | |
263 | size_t newsize = 0; | |
264 | struct stat st; | |
265 | const struct submodule *sub; | |
266 | ||
267 | if (ce_mode_s_ifmt == S_IFREG) { | |
268 | struct stream_filter *filter = get_stream_filter(ce->name, | |
269 | &ce->oid); | |
270 | if (filter && | |
271 | !streaming_write_entry(ce, path, filter, | |
272 | state, to_tempfile, | |
273 | &fstat_done, &st)) | |
274 | goto finish; | |
275 | } | |
276 | ||
277 | switch (ce_mode_s_ifmt) { | |
278 | case S_IFLNK: | |
279 | new_blob = read_blob_entry(ce, &size); | |
280 | if (!new_blob) | |
281 | return error("unable to read sha1 file of %s (%s)", | |
282 | path, oid_to_hex(&ce->oid)); | |
283 | ||
284 | /* | |
285 | * We can't make a real symlink; write out a regular file entry | |
286 | * with the symlink destination as its contents. | |
287 | */ | |
288 | if (!has_symlinks || to_tempfile) | |
289 | goto write_file_entry; | |
290 | ||
291 | ret = symlink(new_blob, path); | |
292 | free(new_blob); | |
293 | if (ret) | |
294 | return error_errno("unable to create symlink %s", path); | |
295 | break; | |
296 | ||
297 | case S_IFREG: | |
298 | /* | |
299 | * We do not send the blob in case of a retry, so do not | |
300 | * bother reading it at all. | |
301 | */ | |
302 | if (dco && dco->state == CE_RETRY) { | |
303 | new_blob = NULL; | |
304 | size = 0; | |
305 | } else { | |
306 | new_blob = read_blob_entry(ce, &size); | |
307 | if (!new_blob) | |
308 | return error("unable to read sha1 file of %s (%s)", | |
309 | path, oid_to_hex(&ce->oid)); | |
310 | } | |
311 | ||
312 | /* | |
313 | * Convert from git internal format to working tree format | |
314 | */ | |
315 | if (dco && dco->state != CE_NO_DELAY) { | |
316 | ret = async_convert_to_working_tree(ce->name, new_blob, | |
317 | size, &buf, dco); | |
318 | if (ret && string_list_has_string(&dco->paths, ce->name)) { | |
319 | free(new_blob); | |
320 | goto delayed; | |
321 | } | |
322 | } else | |
323 | ret = convert_to_working_tree(ce->name, new_blob, size, &buf); | |
324 | ||
325 | if (ret) { | |
326 | free(new_blob); | |
327 | new_blob = strbuf_detach(&buf, &newsize); | |
328 | size = newsize; | |
329 | } | |
330 | /* | |
331 | * No "else" here as errors from convert are OK at this | |
332 | * point. If the error would have been fatal (e.g. | |
333 | * filter is required), then we would have died already. | |
334 | */ | |
335 | ||
336 | write_file_entry: | |
337 | fd = open_output_fd(path, ce, to_tempfile); | |
338 | if (fd < 0) { | |
339 | free(new_blob); | |
340 | return error_errno("unable to create file %s", path); | |
341 | } | |
342 | ||
343 | wrote = write_in_full(fd, new_blob, size); | |
344 | if (!to_tempfile) | |
345 | fstat_done = fstat_output(fd, state, &st); | |
346 | close(fd); | |
347 | free(new_blob); | |
348 | if (wrote < 0) | |
349 | return error("unable to write file %s", path); | |
350 | break; | |
351 | ||
352 | case S_IFGITLINK: | |
353 | if (to_tempfile) | |
354 | return error("cannot create temporary submodule %s", path); | |
355 | if (mkdir(path, 0777) < 0) | |
356 | return error("cannot create submodule directory %s", path); | |
357 | sub = submodule_from_ce(ce); | |
358 | if (sub) | |
359 | return submodule_move_head(ce->name, | |
360 | NULL, oid_to_hex(&ce->oid), | |
361 | state->force ? SUBMODULE_MOVE_HEAD_FORCE : 0); | |
362 | break; | |
363 | ||
364 | default: | |
365 | return error("unknown file mode for %s in index", path); | |
366 | } | |
367 | ||
368 | finish: | |
369 | if (state->refresh_cache) { | |
370 | assert(state->istate); | |
371 | if (!fstat_done) | |
372 | if (lstat(ce->name, &st) < 0) | |
373 | return error_errno("unable to stat just-written file %s", | |
374 | ce->name); | |
375 | fill_stat_cache_info(ce, &st); | |
376 | ce->ce_flags |= CE_UPDATE_IN_BASE; | |
377 | mark_fsmonitor_invalid(state->istate, ce); | |
378 | state->istate->cache_changed |= CE_ENTRY_CHANGED; | |
379 | } | |
380 | delayed: | |
381 | return 0; | |
382 | } | |
383 | ||
384 | /* | |
385 | * This is like 'lstat()', except it refuses to follow symlinks | |
386 | * in the path, after skipping "skiplen". | |
387 | */ | |
388 | static int check_path(const char *path, int len, struct stat *st, int skiplen) | |
389 | { | |
390 | const char *slash = path + len; | |
391 | ||
392 | while (path < slash && *slash != '/') | |
393 | slash--; | |
394 | if (!has_dirs_only_path(path, slash - path, skiplen)) { | |
395 | errno = ENOENT; | |
396 | return -1; | |
397 | } | |
398 | return lstat(path, st); | |
399 | } | |
400 | ||
401 | /* | |
402 | * Write the contents from ce out to the working tree. | |
403 | * | |
404 | * When topath[] is not NULL, instead of writing to the working tree | |
405 | * file named by ce, a temporary file is created by this function and | |
406 | * its name is returned in topath[], which must be able to hold at | |
407 | * least TEMPORARY_FILENAME_LENGTH bytes long. | |
408 | */ | |
409 | int checkout_entry(struct cache_entry *ce, | |
410 | const struct checkout *state, char *topath) | |
411 | { | |
412 | static struct strbuf path = STRBUF_INIT; | |
413 | struct stat st; | |
414 | ||
415 | if (topath) | |
416 | return write_entry(ce, topath, state, 1); | |
417 | ||
418 | strbuf_reset(&path); | |
419 | strbuf_add(&path, state->base_dir, state->base_dir_len); | |
420 | strbuf_add(&path, ce->name, ce_namelen(ce)); | |
421 | ||
422 | if (!check_path(path.buf, path.len, &st, state->base_dir_len)) { | |
423 | const struct submodule *sub; | |
424 | unsigned changed = ce_match_stat(ce, &st, CE_MATCH_IGNORE_VALID|CE_MATCH_IGNORE_SKIP_WORKTREE); | |
425 | /* | |
426 | * Needs to be checked before !changed returns early, | |
427 | * as the possibly empty directory was not changed | |
428 | */ | |
429 | sub = submodule_from_ce(ce); | |
430 | if (sub) { | |
431 | int err; | |
432 | if (!is_submodule_populated_gently(ce->name, &err)) { | |
433 | struct stat sb; | |
434 | if (lstat(ce->name, &sb)) | |
435 | die(_("could not stat file '%s'"), ce->name); | |
436 | if (!(st.st_mode & S_IFDIR)) | |
437 | unlink_or_warn(ce->name); | |
438 | ||
439 | return submodule_move_head(ce->name, | |
440 | NULL, oid_to_hex(&ce->oid), 0); | |
441 | } else | |
442 | return submodule_move_head(ce->name, | |
443 | "HEAD", oid_to_hex(&ce->oid), | |
444 | state->force ? SUBMODULE_MOVE_HEAD_FORCE : 0); | |
445 | } | |
446 | ||
447 | if (!changed) | |
448 | return 0; | |
449 | if (!state->force) { | |
450 | if (!state->quiet) | |
451 | fprintf(stderr, | |
452 | "%s already exists, no checkout\n", | |
453 | path.buf); | |
454 | return -1; | |
455 | } | |
456 | ||
457 | /* | |
458 | * We unlink the old file, to get the new one with the | |
459 | * right permissions (including umask, which is nasty | |
460 | * to emulate by hand - much easier to let the system | |
461 | * just do the right thing) | |
462 | */ | |
463 | if (S_ISDIR(st.st_mode)) { | |
464 | /* If it is a gitlink, leave it alone! */ | |
465 | if (S_ISGITLINK(ce->ce_mode)) | |
466 | return 0; | |
467 | if (!state->force) | |
468 | return error("%s is a directory", path.buf); | |
469 | remove_subtree(&path); | |
470 | } else if (unlink(path.buf)) | |
471 | return error_errno("unable to unlink old '%s'", path.buf); | |
472 | } else if (state->not_new) | |
473 | return 0; | |
474 | ||
475 | create_directories(path.buf, path.len, state); | |
476 | return write_entry(ce, path.buf, state, 0); | |
477 | } |