Merge branch 'po-id' of github.com:bagasme/git-po
[alt-git.git] / entry.c
blob9b0f968a70c9cbeba7c00ec09d0e5dbf42110533
1 #include "cache.h"
2 #include "blob.h"
3 #include "object-store.h"
4 #include "dir.h"
5 #include "streaming.h"
6 #include "submodule.h"
7 #include "progress.h"
8 #include "fsmonitor.h"
9 #include "entry.h"
10 #include "parallel-checkout.h"
12 static void create_directories(const char *path, int path_len,
13 const struct checkout *state)
15 char *buf = xmallocz(path_len);
16 int len = 0;
18 while (len < path_len) {
19 do {
20 buf[len] = path[len];
21 len++;
22 } while (len < path_len && path[len] != '/');
23 if (len >= path_len)
24 break;
25 buf[len] = 0;
28 * For 'checkout-index --prefix=<dir>', <dir> is
29 * allowed to be a symlink to an existing directory,
30 * and we set 'state->base_dir_len' below, such that
31 * we test the path components of the prefix with the
32 * stat() function instead of the lstat() function.
34 if (has_dirs_only_path(buf, len, state->base_dir_len))
35 continue; /* ok, it is already a directory. */
38 * If this mkdir() would fail, it could be that there
39 * is already a symlink or something else exists
40 * there, therefore we then try to unlink it and try
41 * one more time to create the directory.
43 if (mkdir(buf, 0777)) {
44 if (errno == EEXIST && state->force &&
45 !unlink_or_warn(buf) && !mkdir(buf, 0777))
46 continue;
47 die_errno("cannot create directory at '%s'", buf);
50 free(buf);
53 static void remove_subtree(struct strbuf *path)
55 DIR *dir = opendir(path->buf);
56 struct dirent *de;
57 int origlen = path->len;
59 if (!dir)
60 die_errno("cannot opendir '%s'", path->buf);
61 while ((de = readdir_skip_dot_and_dotdot(dir)) != NULL) {
62 struct stat st;
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);
74 closedir(dir);
75 if (rmdir(path->buf))
76 die_errno("cannot rmdir '%s'", path->buf);
79 static int create_file(const char *path, unsigned int mode)
81 mode = (mode & 0100) ? 0777 : 0666;
82 return open(path, O_WRONLY | O_CREAT | O_EXCL, mode);
85 void *read_blob_entry(const struct cache_entry *ce, unsigned long *size)
87 enum object_type type;
88 void *blob_data = read_object_file(&ce->oid, &type, size);
90 if (blob_data) {
91 if (type == OBJ_BLOB)
92 return blob_data;
93 free(blob_data);
95 return NULL;
98 static int open_output_fd(char *path, const struct cache_entry *ce, int to_tempfile)
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);
110 int fstat_checkout_output(int fd, const struct checkout *state, struct stat *st)
112 /* use fstat() only when path == ce->name */
113 if (fstat_is_reliable() &&
114 state->refresh_cache && !state->base_dir_len) {
115 return !fstat(fd, st);
117 return 0;
120 static int streaming_write_entry(const struct cache_entry *ce, char *path,
121 struct stream_filter *filter,
122 const struct checkout *state, int to_tempfile,
123 int *fstat_done, struct stat *statbuf)
125 int result = 0;
126 int fd;
128 fd = open_output_fd(path, ce, to_tempfile);
129 if (fd < 0)
130 return -1;
132 result |= stream_blob_to_fd(fd, &ce->oid, filter, 1);
133 *fstat_done = fstat_checkout_output(fd, state, statbuf);
134 result |= close(fd);
136 if (result)
137 unlink(path);
138 return result;
141 void enable_delayed_checkout(struct checkout *state)
143 if (!state->delayed_checkout) {
144 state->delayed_checkout = xmalloc(sizeof(*state->delayed_checkout));
145 state->delayed_checkout->state = CE_CAN_DELAY;
146 string_list_init_nodup(&state->delayed_checkout->filters);
147 string_list_init_nodup(&state->delayed_checkout->paths);
151 static int remove_available_paths(struct string_list_item *item, void *cb_data)
153 struct string_list *available_paths = cb_data;
154 struct string_list_item *available;
156 available = string_list_lookup(available_paths, item->string);
157 if (available)
158 available->util = (void *)item->string;
159 return !available;
162 int finish_delayed_checkout(struct checkout *state, int *nr_checkouts,
163 int show_progress)
165 int errs = 0;
166 unsigned processed_paths = 0;
167 off_t filtered_bytes = 0;
168 struct string_list_item *filter, *path;
169 struct progress *progress = NULL;
170 struct delayed_checkout *dco = state->delayed_checkout;
172 if (!state->delayed_checkout)
173 return errs;
175 dco->state = CE_RETRY;
176 if (show_progress)
177 progress = start_delayed_progress(_("Filtering content"), dco->paths.nr);
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;
182 if (!async_query_available_blobs(filter->string, &available_paths)) {
183 /* Filter reported an error */
184 errs = 1;
185 filter->string = "";
186 continue;
188 if (available_paths.nr <= 0) {
190 * Filter responded with no entries. That means
191 * the filter is done and we can remove the
192 * filter from the list (see
193 * "string_list_remove_empty_items" call below).
195 filter->string = "";
196 continue;
200 * In dco->paths we store a list of all delayed paths.
201 * The filter just send us a list of available paths.
202 * Remove them from the list.
204 filter_string_list(&dco->paths, 0,
205 &remove_available_paths, &available_paths);
207 for_each_string_list_item(path, &available_paths) {
208 struct cache_entry* ce;
210 if (!path->util) {
211 error("external filter '%s' signaled that '%s' "
212 "is now available although it has not been "
213 "delayed earlier",
214 filter->string, path->string);
215 errs |= 1;
218 * Do not ask the filter for available blobs,
219 * again, as the filter is likely buggy.
221 filter->string = "";
222 continue;
224 ce = index_file_exists(state->istate, path->string,
225 strlen(path->string), 0);
226 if (ce) {
227 display_progress(progress, ++processed_paths);
228 errs |= checkout_entry(ce, state, NULL, nr_checkouts);
229 filtered_bytes += ce->ce_stat_data.sd_size;
230 display_throughput(progress, filtered_bytes);
231 } else
232 errs = 1;
235 string_list_remove_empty_items(&dco->filters, 0);
237 stop_progress(&progress);
238 string_list_clear(&dco->filters, 0);
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);
245 string_list_clear(&dco->paths, 0);
247 free(dco);
248 state->delayed_checkout = NULL;
250 return errs;
253 void update_ce_after_write(const struct checkout *state, struct cache_entry *ce,
254 struct stat *st)
256 if (state->refresh_cache) {
257 assert(state->istate);
258 fill_stat_cache_info(state->istate, ce, st);
259 ce->ce_flags |= CE_UPDATE_IN_BASE;
260 mark_fsmonitor_invalid(state->istate, ce);
261 state->istate->cache_changed |= CE_ENTRY_CHANGED;
265 /* Note: ca is used (and required) iff the entry refers to a regular file. */
266 static int write_entry(struct cache_entry *ce, char *path, struct conv_attrs *ca,
267 const struct checkout *state, int to_tempfile)
269 unsigned int ce_mode_s_ifmt = ce->ce_mode & S_IFMT;
270 struct delayed_checkout *dco = state->delayed_checkout;
271 int fd, ret, fstat_done = 0;
272 char *new_blob;
273 struct strbuf buf = STRBUF_INIT;
274 unsigned long size;
275 ssize_t wrote;
276 size_t newsize = 0;
277 struct stat st;
278 const struct submodule *sub;
279 struct checkout_metadata meta;
281 clone_checkout_metadata(&meta, &state->meta, &ce->oid);
283 if (ce_mode_s_ifmt == S_IFREG) {
284 struct stream_filter *filter = get_stream_filter_ca(ca, &ce->oid);
285 if (filter &&
286 !streaming_write_entry(ce, path, filter,
287 state, to_tempfile,
288 &fstat_done, &st))
289 goto finish;
292 switch (ce_mode_s_ifmt) {
293 case S_IFLNK:
294 new_blob = read_blob_entry(ce, &size);
295 if (!new_blob)
296 return error("unable to read sha1 file of %s (%s)",
297 ce->name, oid_to_hex(&ce->oid));
300 * We can't make a real symlink; write out a regular file entry
301 * with the symlink destination as its contents.
303 if (!has_symlinks || to_tempfile)
304 goto write_file_entry;
306 ret = symlink(new_blob, path);
307 free(new_blob);
308 if (ret)
309 return error_errno("unable to create symlink %s", path);
310 break;
312 case S_IFREG:
314 * We do not send the blob in case of a retry, so do not
315 * bother reading it at all.
317 if (dco && dco->state == CE_RETRY) {
318 new_blob = NULL;
319 size = 0;
320 } else {
321 new_blob = read_blob_entry(ce, &size);
322 if (!new_blob)
323 return error("unable to read sha1 file of %s (%s)",
324 ce->name, oid_to_hex(&ce->oid));
328 * Convert from git internal format to working tree format
330 if (dco && dco->state != CE_NO_DELAY) {
331 ret = async_convert_to_working_tree_ca(ca, ce->name,
332 new_blob, size,
333 &buf, &meta, dco);
334 if (ret && string_list_has_string(&dco->paths, ce->name)) {
335 free(new_blob);
336 goto delayed;
338 } else {
339 ret = convert_to_working_tree_ca(ca, ce->name, new_blob,
340 size, &buf, &meta);
343 if (ret) {
344 free(new_blob);
345 new_blob = strbuf_detach(&buf, &newsize);
346 size = newsize;
349 * No "else" here as errors from convert are OK at this
350 * point. If the error would have been fatal (e.g.
351 * filter is required), then we would have died already.
354 write_file_entry:
355 fd = open_output_fd(path, ce, to_tempfile);
356 if (fd < 0) {
357 free(new_blob);
358 return error_errno("unable to create file %s", path);
361 wrote = write_in_full(fd, new_blob, size);
362 if (!to_tempfile)
363 fstat_done = fstat_checkout_output(fd, state, &st);
364 close(fd);
365 free(new_blob);
366 if (wrote < 0)
367 return error("unable to write file %s", path);
368 break;
370 case S_IFGITLINK:
371 if (to_tempfile)
372 return error("cannot create temporary submodule %s", ce->name);
373 if (mkdir(path, 0777) < 0)
374 return error("cannot create submodule directory %s", path);
375 sub = submodule_from_ce(ce);
376 if (sub)
377 return submodule_move_head(ce->name,
378 NULL, oid_to_hex(&ce->oid),
379 state->force ? SUBMODULE_MOVE_HEAD_FORCE : 0);
380 break;
382 default:
383 return error("unknown file mode for %s in index", ce->name);
386 finish:
387 if (state->refresh_cache) {
388 if (!fstat_done && lstat(ce->name, &st) < 0)
389 return error_errno("unable to stat just-written file %s",
390 ce->name);
391 update_ce_after_write(state, ce , &st);
393 delayed:
394 return 0;
398 * This is like 'lstat()', except it refuses to follow symlinks
399 * in the path, after skipping "skiplen".
401 static int check_path(const char *path, int len, struct stat *st, int skiplen)
403 const char *slash = path + len;
405 while (path < slash && *slash != '/')
406 slash--;
407 if (!has_dirs_only_path(path, slash - path, skiplen)) {
408 errno = ENOENT;
409 return -1;
411 return lstat(path, st);
414 static void mark_colliding_entries(const struct checkout *state,
415 struct cache_entry *ce, struct stat *st)
417 int i, trust_ino = check_stat;
419 #if defined(GIT_WINDOWS_NATIVE) || defined(__CYGWIN__)
420 trust_ino = 0;
421 #endif
423 ce->ce_flags |= CE_MATCHED;
425 /* TODO: audit for interaction with sparse-index. */
426 ensure_full_index(state->istate);
427 for (i = 0; i < state->istate->cache_nr; i++) {
428 struct cache_entry *dup = state->istate->cache[i];
430 if (dup == ce) {
432 * Parallel checkout doesn't create the files in index
433 * order. So the other side of the collision may appear
434 * after the given cache_entry in the array.
436 if (parallel_checkout_status() == PC_RUNNING)
437 continue;
438 else
439 break;
442 if (dup->ce_flags & (CE_MATCHED | CE_VALID | CE_SKIP_WORKTREE))
443 continue;
445 if ((trust_ino && !match_stat_data(&dup->ce_stat_data, st)) ||
446 (!trust_ino && !fspathcmp(ce->name, dup->name))) {
447 dup->ce_flags |= CE_MATCHED;
448 break;
453 int checkout_entry_ca(struct cache_entry *ce, struct conv_attrs *ca,
454 const struct checkout *state, char *topath,
455 int *nr_checkouts)
457 static struct strbuf path = STRBUF_INIT;
458 struct stat st;
459 struct conv_attrs ca_buf;
461 if (ce->ce_flags & CE_WT_REMOVE) {
462 if (topath)
464 * No content and thus no path to create, so we have
465 * no pathname to return.
467 BUG("Can't remove entry to a path");
468 unlink_entry(ce);
469 return 0;
472 if (topath) {
473 if (S_ISREG(ce->ce_mode) && !ca) {
474 convert_attrs(state->istate, &ca_buf, ce->name);
475 ca = &ca_buf;
477 return write_entry(ce, topath, ca, state, 1);
480 strbuf_reset(&path);
481 strbuf_add(&path, state->base_dir, state->base_dir_len);
482 strbuf_add(&path, ce->name, ce_namelen(ce));
484 if (!check_path(path.buf, path.len, &st, state->base_dir_len)) {
485 const struct submodule *sub;
486 unsigned changed = ie_match_stat(state->istate, ce, &st,
487 CE_MATCH_IGNORE_VALID | CE_MATCH_IGNORE_SKIP_WORKTREE);
489 * Needs to be checked before !changed returns early,
490 * as the possibly empty directory was not changed
492 sub = submodule_from_ce(ce);
493 if (sub) {
494 int err;
495 if (!is_submodule_populated_gently(ce->name, &err)) {
496 struct stat sb;
497 if (lstat(ce->name, &sb))
498 die(_("could not stat file '%s'"), ce->name);
499 if (!(st.st_mode & S_IFDIR))
500 unlink_or_warn(ce->name);
502 return submodule_move_head(ce->name,
503 NULL, oid_to_hex(&ce->oid), 0);
504 } else
505 return submodule_move_head(ce->name,
506 "HEAD", oid_to_hex(&ce->oid),
507 state->force ? SUBMODULE_MOVE_HEAD_FORCE : 0);
510 if (!changed)
511 return 0;
512 if (!state->force) {
513 if (!state->quiet)
514 fprintf(stderr,
515 "%s already exists, no checkout\n",
516 path.buf);
517 return -1;
520 if (state->clone)
521 mark_colliding_entries(state, ce, &st);
524 * We unlink the old file, to get the new one with the
525 * right permissions (including umask, which is nasty
526 * to emulate by hand - much easier to let the system
527 * just do the right thing)
529 if (S_ISDIR(st.st_mode)) {
530 /* If it is a gitlink, leave it alone! */
531 if (S_ISGITLINK(ce->ce_mode))
532 return 0;
533 remove_subtree(&path);
534 } else if (unlink(path.buf))
535 return error_errno("unable to unlink old '%s'", path.buf);
536 } else if (state->not_new)
537 return 0;
539 create_directories(path.buf, path.len, state);
541 if (nr_checkouts)
542 (*nr_checkouts)++;
544 if (S_ISREG(ce->ce_mode) && !ca) {
545 convert_attrs(state->istate, &ca_buf, ce->name);
546 ca = &ca_buf;
549 if (!enqueue_checkout(ce, ca))
550 return 0;
552 return write_entry(ce, path.buf, ca, state, 0);
555 void unlink_entry(const struct cache_entry *ce)
557 const struct submodule *sub = submodule_from_ce(ce);
558 if (sub) {
559 /* state.force is set at the caller. */
560 submodule_move_head(ce->name, "HEAD", NULL,
561 SUBMODULE_MOVE_HEAD_FORCE);
563 if (check_leading_path(ce->name, ce_namelen(ce), 1) >= 0)
564 return;
565 if (remove_or_warn(ce->ce_mode, ce->name))
566 return;
567 schedule_dir_for_removal(ce->name, ce_namelen(ce));