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1 | #define NO_THE_INDEX_COMPATIBILITY_MACROS | |
2 | #include "cache.h" | |
3 | #include "config.h" | |
4 | #include "attr.h" | |
5 | #include "run-command.h" | |
6 | #include "quote.h" | |
7 | #include "sigchain.h" | |
8 | #include "pkt-line.h" | |
9 | #include "sub-process.h" | |
10 | ||
11 | /* | |
12 | * convert.c - convert a file when checking it out and checking it in. | |
13 | * | |
14 | * This should use the pathname to decide on whether it wants to do some | |
15 | * more interesting conversions (automatic gzip/unzip, general format | |
16 | * conversions etc etc), but by default it just does automatic CRLF<->LF | |
17 | * translation when the "text" attribute or "auto_crlf" option is set. | |
18 | */ | |
19 | ||
20 | /* Stat bits: When BIN is set, the txt bits are unset */ | |
21 | #define CONVERT_STAT_BITS_TXT_LF 0x1 | |
22 | #define CONVERT_STAT_BITS_TXT_CRLF 0x2 | |
23 | #define CONVERT_STAT_BITS_BIN 0x4 | |
24 | ||
25 | enum crlf_action { | |
26 | CRLF_UNDEFINED, | |
27 | CRLF_BINARY, | |
28 | CRLF_TEXT, | |
29 | CRLF_TEXT_INPUT, | |
30 | CRLF_TEXT_CRLF, | |
31 | CRLF_AUTO, | |
32 | CRLF_AUTO_INPUT, | |
33 | CRLF_AUTO_CRLF | |
34 | }; | |
35 | ||
36 | struct text_stat { | |
37 | /* NUL, CR, LF and CRLF counts */ | |
38 | unsigned nul, lonecr, lonelf, crlf; | |
39 | ||
40 | /* These are just approximations! */ | |
41 | unsigned printable, nonprintable; | |
42 | }; | |
43 | ||
44 | static void gather_stats(const char *buf, unsigned long size, struct text_stat *stats) | |
45 | { | |
46 | unsigned long i; | |
47 | ||
48 | memset(stats, 0, sizeof(*stats)); | |
49 | ||
50 | for (i = 0; i < size; i++) { | |
51 | unsigned char c = buf[i]; | |
52 | if (c == '\r') { | |
53 | if (i+1 < size && buf[i+1] == '\n') { | |
54 | stats->crlf++; | |
55 | i++; | |
56 | } else | |
57 | stats->lonecr++; | |
58 | continue; | |
59 | } | |
60 | if (c == '\n') { | |
61 | stats->lonelf++; | |
62 | continue; | |
63 | } | |
64 | if (c == 127) | |
65 | /* DEL */ | |
66 | stats->nonprintable++; | |
67 | else if (c < 32) { | |
68 | switch (c) { | |
69 | /* BS, HT, ESC and FF */ | |
70 | case '\b': case '\t': case '\033': case '\014': | |
71 | stats->printable++; | |
72 | break; | |
73 | case 0: | |
74 | stats->nul++; | |
75 | /* fall through */ | |
76 | default: | |
77 | stats->nonprintable++; | |
78 | } | |
79 | } | |
80 | else | |
81 | stats->printable++; | |
82 | } | |
83 | ||
84 | /* If file ends with EOF then don't count this EOF as non-printable. */ | |
85 | if (size >= 1 && buf[size-1] == '\032') | |
86 | stats->nonprintable--; | |
87 | } | |
88 | ||
89 | /* | |
90 | * The same heuristics as diff.c::mmfile_is_binary() | |
91 | * We treat files with bare CR as binary | |
92 | */ | |
93 | static int convert_is_binary(unsigned long size, const struct text_stat *stats) | |
94 | { | |
95 | if (stats->lonecr) | |
96 | return 1; | |
97 | if (stats->nul) | |
98 | return 1; | |
99 | if ((stats->printable >> 7) < stats->nonprintable) | |
100 | return 1; | |
101 | return 0; | |
102 | } | |
103 | ||
104 | static unsigned int gather_convert_stats(const char *data, unsigned long size) | |
105 | { | |
106 | struct text_stat stats; | |
107 | int ret = 0; | |
108 | if (!data || !size) | |
109 | return 0; | |
110 | gather_stats(data, size, &stats); | |
111 | if (convert_is_binary(size, &stats)) | |
112 | ret |= CONVERT_STAT_BITS_BIN; | |
113 | if (stats.crlf) | |
114 | ret |= CONVERT_STAT_BITS_TXT_CRLF; | |
115 | if (stats.lonelf) | |
116 | ret |= CONVERT_STAT_BITS_TXT_LF; | |
117 | ||
118 | return ret; | |
119 | } | |
120 | ||
121 | static const char *gather_convert_stats_ascii(const char *data, unsigned long size) | |
122 | { | |
123 | unsigned int convert_stats = gather_convert_stats(data, size); | |
124 | ||
125 | if (convert_stats & CONVERT_STAT_BITS_BIN) | |
126 | return "-text"; | |
127 | switch (convert_stats) { | |
128 | case CONVERT_STAT_BITS_TXT_LF: | |
129 | return "lf"; | |
130 | case CONVERT_STAT_BITS_TXT_CRLF: | |
131 | return "crlf"; | |
132 | case CONVERT_STAT_BITS_TXT_LF | CONVERT_STAT_BITS_TXT_CRLF: | |
133 | return "mixed"; | |
134 | default: | |
135 | return "none"; | |
136 | } | |
137 | } | |
138 | ||
139 | const char *get_cached_convert_stats_ascii(const struct index_state *istate, | |
140 | const char *path) | |
141 | { | |
142 | const char *ret; | |
143 | unsigned long sz; | |
144 | void *data = read_blob_data_from_index(istate, path, &sz); | |
145 | ret = gather_convert_stats_ascii(data, sz); | |
146 | free(data); | |
147 | return ret; | |
148 | } | |
149 | ||
150 | const char *get_wt_convert_stats_ascii(const char *path) | |
151 | { | |
152 | const char *ret = ""; | |
153 | struct strbuf sb = STRBUF_INIT; | |
154 | if (strbuf_read_file(&sb, path, 0) >= 0) | |
155 | ret = gather_convert_stats_ascii(sb.buf, sb.len); | |
156 | strbuf_release(&sb); | |
157 | return ret; | |
158 | } | |
159 | ||
160 | static int text_eol_is_crlf(void) | |
161 | { | |
162 | if (auto_crlf == AUTO_CRLF_TRUE) | |
163 | return 1; | |
164 | else if (auto_crlf == AUTO_CRLF_INPUT) | |
165 | return 0; | |
166 | if (core_eol == EOL_CRLF) | |
167 | return 1; | |
168 | if (core_eol == EOL_UNSET && EOL_NATIVE == EOL_CRLF) | |
169 | return 1; | |
170 | return 0; | |
171 | } | |
172 | ||
173 | static enum eol output_eol(enum crlf_action crlf_action) | |
174 | { | |
175 | switch (crlf_action) { | |
176 | case CRLF_BINARY: | |
177 | return EOL_UNSET; | |
178 | case CRLF_TEXT_CRLF: | |
179 | return EOL_CRLF; | |
180 | case CRLF_TEXT_INPUT: | |
181 | return EOL_LF; | |
182 | case CRLF_UNDEFINED: | |
183 | case CRLF_AUTO_CRLF: | |
184 | return EOL_CRLF; | |
185 | case CRLF_AUTO_INPUT: | |
186 | return EOL_LF; | |
187 | case CRLF_TEXT: | |
188 | case CRLF_AUTO: | |
189 | /* fall through */ | |
190 | return text_eol_is_crlf() ? EOL_CRLF : EOL_LF; | |
191 | } | |
192 | warning("Illegal crlf_action %d\n", (int)crlf_action); | |
193 | return core_eol; | |
194 | } | |
195 | ||
196 | static void check_global_conv_flags_eol(const char *path, enum crlf_action crlf_action, | |
197 | struct text_stat *old_stats, struct text_stat *new_stats, | |
198 | int conv_flags) | |
199 | { | |
200 | if (old_stats->crlf && !new_stats->crlf ) { | |
201 | /* | |
202 | * CRLFs would not be restored by checkout | |
203 | */ | |
204 | if (conv_flags & CONV_EOL_RNDTRP_DIE) | |
205 | die(_("CRLF would be replaced by LF in %s."), path); | |
206 | else if (conv_flags & CONV_EOL_RNDTRP_WARN) | |
207 | warning(_("CRLF will be replaced by LF in %s.\n" | |
208 | "The file will have its original line" | |
209 | " endings in your working directory."), path); | |
210 | } else if (old_stats->lonelf && !new_stats->lonelf ) { | |
211 | /* | |
212 | * CRLFs would be added by checkout | |
213 | */ | |
214 | if (conv_flags & CONV_EOL_RNDTRP_DIE) | |
215 | die(_("LF would be replaced by CRLF in %s"), path); | |
216 | else if (conv_flags & CONV_EOL_RNDTRP_WARN) | |
217 | warning(_("LF will be replaced by CRLF in %s.\n" | |
218 | "The file will have its original line" | |
219 | " endings in your working directory."), path); | |
220 | } | |
221 | } | |
222 | ||
223 | static int has_crlf_in_index(const struct index_state *istate, const char *path) | |
224 | { | |
225 | unsigned long sz; | |
226 | void *data; | |
227 | const char *crp; | |
228 | int has_crlf = 0; | |
229 | ||
230 | data = read_blob_data_from_index(istate, path, &sz); | |
231 | if (!data) | |
232 | return 0; | |
233 | ||
234 | crp = memchr(data, '\r', sz); | |
235 | if (crp) { | |
236 | unsigned int ret_stats; | |
237 | ret_stats = gather_convert_stats(data, sz); | |
238 | if (!(ret_stats & CONVERT_STAT_BITS_BIN) && | |
239 | (ret_stats & CONVERT_STAT_BITS_TXT_CRLF)) | |
240 | has_crlf = 1; | |
241 | } | |
242 | free(data); | |
243 | return has_crlf; | |
244 | } | |
245 | ||
246 | static int will_convert_lf_to_crlf(size_t len, struct text_stat *stats, | |
247 | enum crlf_action crlf_action) | |
248 | { | |
249 | if (output_eol(crlf_action) != EOL_CRLF) | |
250 | return 0; | |
251 | /* No "naked" LF? Nothing to convert, regardless. */ | |
252 | if (!stats->lonelf) | |
253 | return 0; | |
254 | ||
255 | if (crlf_action == CRLF_AUTO || crlf_action == CRLF_AUTO_INPUT || crlf_action == CRLF_AUTO_CRLF) { | |
256 | /* If we have any CR or CRLF line endings, we do not touch it */ | |
257 | /* This is the new safer autocrlf-handling */ | |
258 | if (stats->lonecr || stats->crlf) | |
259 | return 0; | |
260 | ||
261 | if (convert_is_binary(len, stats)) | |
262 | return 0; | |
263 | } | |
264 | return 1; | |
265 | ||
266 | } | |
267 | ||
268 | static int crlf_to_git(const struct index_state *istate, | |
269 | const char *path, const char *src, size_t len, | |
270 | struct strbuf *buf, | |
271 | enum crlf_action crlf_action, int conv_flags) | |
272 | { | |
273 | struct text_stat stats; | |
274 | char *dst; | |
275 | int convert_crlf_into_lf; | |
276 | ||
277 | if (crlf_action == CRLF_BINARY || | |
278 | (src && !len)) | |
279 | return 0; | |
280 | ||
281 | /* | |
282 | * If we are doing a dry-run and have no source buffer, there is | |
283 | * nothing to analyze; we must assume we would convert. | |
284 | */ | |
285 | if (!buf && !src) | |
286 | return 1; | |
287 | ||
288 | gather_stats(src, len, &stats); | |
289 | /* Optimization: No CRLF? Nothing to convert, regardless. */ | |
290 | convert_crlf_into_lf = !!stats.crlf; | |
291 | ||
292 | if (crlf_action == CRLF_AUTO || crlf_action == CRLF_AUTO_INPUT || crlf_action == CRLF_AUTO_CRLF) { | |
293 | if (convert_is_binary(len, &stats)) | |
294 | return 0; | |
295 | /* | |
296 | * If the file in the index has any CR in it, do not | |
297 | * convert. This is the new safer autocrlf handling, | |
298 | * unless we want to renormalize in a merge or | |
299 | * cherry-pick. | |
300 | */ | |
301 | if ((!(conv_flags & CONV_EOL_RENORMALIZE)) && | |
302 | has_crlf_in_index(istate, path)) | |
303 | convert_crlf_into_lf = 0; | |
304 | } | |
305 | if (((conv_flags & CONV_EOL_RNDTRP_WARN) || | |
306 | ((conv_flags & CONV_EOL_RNDTRP_DIE) && len))) { | |
307 | struct text_stat new_stats; | |
308 | memcpy(&new_stats, &stats, sizeof(new_stats)); | |
309 | /* simulate "git add" */ | |
310 | if (convert_crlf_into_lf) { | |
311 | new_stats.lonelf += new_stats.crlf; | |
312 | new_stats.crlf = 0; | |
313 | } | |
314 | /* simulate "git checkout" */ | |
315 | if (will_convert_lf_to_crlf(len, &new_stats, crlf_action)) { | |
316 | new_stats.crlf += new_stats.lonelf; | |
317 | new_stats.lonelf = 0; | |
318 | } | |
319 | check_global_conv_flags_eol(path, crlf_action, &stats, &new_stats, conv_flags); | |
320 | } | |
321 | if (!convert_crlf_into_lf) | |
322 | return 0; | |
323 | ||
324 | /* | |
325 | * At this point all of our source analysis is done, and we are sure we | |
326 | * would convert. If we are in dry-run mode, we can give an answer. | |
327 | */ | |
328 | if (!buf) | |
329 | return 1; | |
330 | ||
331 | /* only grow if not in place */ | |
332 | if (strbuf_avail(buf) + buf->len < len) | |
333 | strbuf_grow(buf, len - buf->len); | |
334 | dst = buf->buf; | |
335 | if (crlf_action == CRLF_AUTO || crlf_action == CRLF_AUTO_INPUT || crlf_action == CRLF_AUTO_CRLF) { | |
336 | /* | |
337 | * If we guessed, we already know we rejected a file with | |
338 | * lone CR, and we can strip a CR without looking at what | |
339 | * follow it. | |
340 | */ | |
341 | do { | |
342 | unsigned char c = *src++; | |
343 | if (c != '\r') | |
344 | *dst++ = c; | |
345 | } while (--len); | |
346 | } else { | |
347 | do { | |
348 | unsigned char c = *src++; | |
349 | if (! (c == '\r' && (1 < len && *src == '\n'))) | |
350 | *dst++ = c; | |
351 | } while (--len); | |
352 | } | |
353 | strbuf_setlen(buf, dst - buf->buf); | |
354 | return 1; | |
355 | } | |
356 | ||
357 | static int crlf_to_worktree(const char *path, const char *src, size_t len, | |
358 | struct strbuf *buf, enum crlf_action crlf_action) | |
359 | { | |
360 | char *to_free = NULL; | |
361 | struct text_stat stats; | |
362 | ||
363 | if (!len || output_eol(crlf_action) != EOL_CRLF) | |
364 | return 0; | |
365 | ||
366 | gather_stats(src, len, &stats); | |
367 | if (!will_convert_lf_to_crlf(len, &stats, crlf_action)) | |
368 | return 0; | |
369 | ||
370 | /* are we "faking" in place editing ? */ | |
371 | if (src == buf->buf) | |
372 | to_free = strbuf_detach(buf, NULL); | |
373 | ||
374 | strbuf_grow(buf, len + stats.lonelf); | |
375 | for (;;) { | |
376 | const char *nl = memchr(src, '\n', len); | |
377 | if (!nl) | |
378 | break; | |
379 | if (nl > src && nl[-1] == '\r') { | |
380 | strbuf_add(buf, src, nl + 1 - src); | |
381 | } else { | |
382 | strbuf_add(buf, src, nl - src); | |
383 | strbuf_addstr(buf, "\r\n"); | |
384 | } | |
385 | len -= nl + 1 - src; | |
386 | src = nl + 1; | |
387 | } | |
388 | strbuf_add(buf, src, len); | |
389 | ||
390 | free(to_free); | |
391 | return 1; | |
392 | } | |
393 | ||
394 | struct filter_params { | |
395 | const char *src; | |
396 | unsigned long size; | |
397 | int fd; | |
398 | const char *cmd; | |
399 | const char *path; | |
400 | }; | |
401 | ||
402 | static int filter_buffer_or_fd(int in, int out, void *data) | |
403 | { | |
404 | /* | |
405 | * Spawn cmd and feed the buffer contents through its stdin. | |
406 | */ | |
407 | struct child_process child_process = CHILD_PROCESS_INIT; | |
408 | struct filter_params *params = (struct filter_params *)data; | |
409 | int write_err, status; | |
410 | const char *argv[] = { NULL, NULL }; | |
411 | ||
412 | /* apply % substitution to cmd */ | |
413 | struct strbuf cmd = STRBUF_INIT; | |
414 | struct strbuf path = STRBUF_INIT; | |
415 | struct strbuf_expand_dict_entry dict[] = { | |
416 | { "f", NULL, }, | |
417 | { NULL, NULL, }, | |
418 | }; | |
419 | ||
420 | /* quote the path to preserve spaces, etc. */ | |
421 | sq_quote_buf(&path, params->path); | |
422 | dict[0].value = path.buf; | |
423 | ||
424 | /* expand all %f with the quoted path */ | |
425 | strbuf_expand(&cmd, params->cmd, strbuf_expand_dict_cb, &dict); | |
426 | strbuf_release(&path); | |
427 | ||
428 | argv[0] = cmd.buf; | |
429 | ||
430 | child_process.argv = argv; | |
431 | child_process.use_shell = 1; | |
432 | child_process.in = -1; | |
433 | child_process.out = out; | |
434 | ||
435 | if (start_command(&child_process)) { | |
436 | strbuf_release(&cmd); | |
437 | return error("cannot fork to run external filter '%s'", params->cmd); | |
438 | } | |
439 | ||
440 | sigchain_push(SIGPIPE, SIG_IGN); | |
441 | ||
442 | if (params->src) { | |
443 | write_err = (write_in_full(child_process.in, | |
444 | params->src, params->size) < 0); | |
445 | if (errno == EPIPE) | |
446 | write_err = 0; | |
447 | } else { | |
448 | write_err = copy_fd(params->fd, child_process.in); | |
449 | if (write_err == COPY_WRITE_ERROR && errno == EPIPE) | |
450 | write_err = 0; | |
451 | } | |
452 | ||
453 | if (close(child_process.in)) | |
454 | write_err = 1; | |
455 | if (write_err) | |
456 | error("cannot feed the input to external filter '%s'", params->cmd); | |
457 | ||
458 | sigchain_pop(SIGPIPE); | |
459 | ||
460 | status = finish_command(&child_process); | |
461 | if (status) | |
462 | error("external filter '%s' failed %d", params->cmd, status); | |
463 | ||
464 | strbuf_release(&cmd); | |
465 | return (write_err || status); | |
466 | } | |
467 | ||
468 | static int apply_single_file_filter(const char *path, const char *src, size_t len, int fd, | |
469 | struct strbuf *dst, const char *cmd) | |
470 | { | |
471 | /* | |
472 | * Create a pipeline to have the command filter the buffer's | |
473 | * contents. | |
474 | * | |
475 | * (child --> cmd) --> us | |
476 | */ | |
477 | int err = 0; | |
478 | struct strbuf nbuf = STRBUF_INIT; | |
479 | struct async async; | |
480 | struct filter_params params; | |
481 | ||
482 | memset(&async, 0, sizeof(async)); | |
483 | async.proc = filter_buffer_or_fd; | |
484 | async.data = ¶ms; | |
485 | async.out = -1; | |
486 | params.src = src; | |
487 | params.size = len; | |
488 | params.fd = fd; | |
489 | params.cmd = cmd; | |
490 | params.path = path; | |
491 | ||
492 | fflush(NULL); | |
493 | if (start_async(&async)) | |
494 | return 0; /* error was already reported */ | |
495 | ||
496 | if (strbuf_read(&nbuf, async.out, len) < 0) { | |
497 | err = error("read from external filter '%s' failed", cmd); | |
498 | } | |
499 | if (close(async.out)) { | |
500 | err = error("read from external filter '%s' failed", cmd); | |
501 | } | |
502 | if (finish_async(&async)) { | |
503 | err = error("external filter '%s' failed", cmd); | |
504 | } | |
505 | ||
506 | if (!err) { | |
507 | strbuf_swap(dst, &nbuf); | |
508 | } | |
509 | strbuf_release(&nbuf); | |
510 | return !err; | |
511 | } | |
512 | ||
513 | #define CAP_CLEAN (1u<<0) | |
514 | #define CAP_SMUDGE (1u<<1) | |
515 | #define CAP_DELAY (1u<<2) | |
516 | ||
517 | struct cmd2process { | |
518 | struct subprocess_entry subprocess; /* must be the first member! */ | |
519 | unsigned int supported_capabilities; | |
520 | }; | |
521 | ||
522 | static int subprocess_map_initialized; | |
523 | static struct hashmap subprocess_map; | |
524 | ||
525 | static int start_multi_file_filter_fn(struct subprocess_entry *subprocess) | |
526 | { | |
527 | static int versions[] = {2, 0}; | |
528 | static struct subprocess_capability capabilities[] = { | |
529 | { "clean", CAP_CLEAN }, | |
530 | { "smudge", CAP_SMUDGE }, | |
531 | { "delay", CAP_DELAY }, | |
532 | { NULL, 0 } | |
533 | }; | |
534 | struct cmd2process *entry = (struct cmd2process *)subprocess; | |
535 | return subprocess_handshake(subprocess, "git-filter", versions, NULL, | |
536 | capabilities, | |
537 | &entry->supported_capabilities); | |
538 | } | |
539 | ||
540 | static void handle_filter_error(const struct strbuf *filter_status, | |
541 | struct cmd2process *entry, | |
542 | const unsigned int wanted_capability) { | |
543 | if (!strcmp(filter_status->buf, "error")) | |
544 | ; /* The filter signaled a problem with the file. */ | |
545 | else if (!strcmp(filter_status->buf, "abort") && wanted_capability) { | |
546 | /* | |
547 | * The filter signaled a permanent problem. Don't try to filter | |
548 | * files with the same command for the lifetime of the current | |
549 | * Git process. | |
550 | */ | |
551 | entry->supported_capabilities &= ~wanted_capability; | |
552 | } else { | |
553 | /* | |
554 | * Something went wrong with the protocol filter. | |
555 | * Force shutdown and restart if another blob requires filtering. | |
556 | */ | |
557 | error("external filter '%s' failed", entry->subprocess.cmd); | |
558 | subprocess_stop(&subprocess_map, &entry->subprocess); | |
559 | free(entry); | |
560 | } | |
561 | } | |
562 | ||
563 | static int apply_multi_file_filter(const char *path, const char *src, size_t len, | |
564 | int fd, struct strbuf *dst, const char *cmd, | |
565 | const unsigned int wanted_capability, | |
566 | struct delayed_checkout *dco) | |
567 | { | |
568 | int err; | |
569 | int can_delay = 0; | |
570 | struct cmd2process *entry; | |
571 | struct child_process *process; | |
572 | struct strbuf nbuf = STRBUF_INIT; | |
573 | struct strbuf filter_status = STRBUF_INIT; | |
574 | const char *filter_type; | |
575 | ||
576 | if (!subprocess_map_initialized) { | |
577 | subprocess_map_initialized = 1; | |
578 | hashmap_init(&subprocess_map, cmd2process_cmp, NULL, 0); | |
579 | entry = NULL; | |
580 | } else { | |
581 | entry = (struct cmd2process *)subprocess_find_entry(&subprocess_map, cmd); | |
582 | } | |
583 | ||
584 | fflush(NULL); | |
585 | ||
586 | if (!entry) { | |
587 | entry = xmalloc(sizeof(*entry)); | |
588 | entry->supported_capabilities = 0; | |
589 | ||
590 | if (subprocess_start(&subprocess_map, &entry->subprocess, cmd, start_multi_file_filter_fn)) { | |
591 | free(entry); | |
592 | return 0; | |
593 | } | |
594 | } | |
595 | process = &entry->subprocess.process; | |
596 | ||
597 | if (!(entry->supported_capabilities & wanted_capability)) | |
598 | return 0; | |
599 | ||
600 | if (wanted_capability & CAP_CLEAN) | |
601 | filter_type = "clean"; | |
602 | else if (wanted_capability & CAP_SMUDGE) | |
603 | filter_type = "smudge"; | |
604 | else | |
605 | die("unexpected filter type"); | |
606 | ||
607 | sigchain_push(SIGPIPE, SIG_IGN); | |
608 | ||
609 | assert(strlen(filter_type) < LARGE_PACKET_DATA_MAX - strlen("command=\n")); | |
610 | err = packet_write_fmt_gently(process->in, "command=%s\n", filter_type); | |
611 | if (err) | |
612 | goto done; | |
613 | ||
614 | err = strlen(path) > LARGE_PACKET_DATA_MAX - strlen("pathname=\n"); | |
615 | if (err) { | |
616 | error("path name too long for external filter"); | |
617 | goto done; | |
618 | } | |
619 | ||
620 | err = packet_write_fmt_gently(process->in, "pathname=%s\n", path); | |
621 | if (err) | |
622 | goto done; | |
623 | ||
624 | if ((entry->supported_capabilities & CAP_DELAY) && | |
625 | dco && dco->state == CE_CAN_DELAY) { | |
626 | can_delay = 1; | |
627 | err = packet_write_fmt_gently(process->in, "can-delay=1\n"); | |
628 | if (err) | |
629 | goto done; | |
630 | } | |
631 | ||
632 | err = packet_flush_gently(process->in); | |
633 | if (err) | |
634 | goto done; | |
635 | ||
636 | if (fd >= 0) | |
637 | err = write_packetized_from_fd(fd, process->in); | |
638 | else | |
639 | err = write_packetized_from_buf(src, len, process->in); | |
640 | if (err) | |
641 | goto done; | |
642 | ||
643 | err = subprocess_read_status(process->out, &filter_status); | |
644 | if (err) | |
645 | goto done; | |
646 | ||
647 | if (can_delay && !strcmp(filter_status.buf, "delayed")) { | |
648 | string_list_insert(&dco->filters, cmd); | |
649 | string_list_insert(&dco->paths, path); | |
650 | } else { | |
651 | /* The filter got the blob and wants to send us a response. */ | |
652 | err = strcmp(filter_status.buf, "success"); | |
653 | if (err) | |
654 | goto done; | |
655 | ||
656 | err = read_packetized_to_strbuf(process->out, &nbuf) < 0; | |
657 | if (err) | |
658 | goto done; | |
659 | ||
660 | err = subprocess_read_status(process->out, &filter_status); | |
661 | if (err) | |
662 | goto done; | |
663 | ||
664 | err = strcmp(filter_status.buf, "success"); | |
665 | } | |
666 | ||
667 | done: | |
668 | sigchain_pop(SIGPIPE); | |
669 | ||
670 | if (err) | |
671 | handle_filter_error(&filter_status, entry, wanted_capability); | |
672 | else | |
673 | strbuf_swap(dst, &nbuf); | |
674 | strbuf_release(&nbuf); | |
675 | return !err; | |
676 | } | |
677 | ||
678 | ||
679 | int async_query_available_blobs(const char *cmd, struct string_list *available_paths) | |
680 | { | |
681 | int err; | |
682 | char *line; | |
683 | struct cmd2process *entry; | |
684 | struct child_process *process; | |
685 | struct strbuf filter_status = STRBUF_INIT; | |
686 | ||
687 | assert(subprocess_map_initialized); | |
688 | entry = (struct cmd2process *)subprocess_find_entry(&subprocess_map, cmd); | |
689 | if (!entry) { | |
690 | error("external filter '%s' is not available anymore although " | |
691 | "not all paths have been filtered", cmd); | |
692 | return 0; | |
693 | } | |
694 | process = &entry->subprocess.process; | |
695 | sigchain_push(SIGPIPE, SIG_IGN); | |
696 | ||
697 | err = packet_write_fmt_gently( | |
698 | process->in, "command=list_available_blobs\n"); | |
699 | if (err) | |
700 | goto done; | |
701 | ||
702 | err = packet_flush_gently(process->in); | |
703 | if (err) | |
704 | goto done; | |
705 | ||
706 | while ((line = packet_read_line(process->out, NULL))) { | |
707 | const char *path; | |
708 | if (skip_prefix(line, "pathname=", &path)) | |
709 | string_list_insert(available_paths, xstrdup(path)); | |
710 | else | |
711 | ; /* ignore unknown keys */ | |
712 | } | |
713 | ||
714 | err = subprocess_read_status(process->out, &filter_status); | |
715 | if (err) | |
716 | goto done; | |
717 | ||
718 | err = strcmp(filter_status.buf, "success"); | |
719 | ||
720 | done: | |
721 | sigchain_pop(SIGPIPE); | |
722 | ||
723 | if (err) | |
724 | handle_filter_error(&filter_status, entry, 0); | |
725 | return !err; | |
726 | } | |
727 | ||
728 | static struct convert_driver { | |
729 | const char *name; | |
730 | struct convert_driver *next; | |
731 | const char *smudge; | |
732 | const char *clean; | |
733 | const char *process; | |
734 | int required; | |
735 | } *user_convert, **user_convert_tail; | |
736 | ||
737 | static int apply_filter(const char *path, const char *src, size_t len, | |
738 | int fd, struct strbuf *dst, struct convert_driver *drv, | |
739 | const unsigned int wanted_capability, | |
740 | struct delayed_checkout *dco) | |
741 | { | |
742 | const char *cmd = NULL; | |
743 | ||
744 | if (!drv) | |
745 | return 0; | |
746 | ||
747 | if (!dst) | |
748 | return 1; | |
749 | ||
750 | if ((wanted_capability & CAP_CLEAN) && !drv->process && drv->clean) | |
751 | cmd = drv->clean; | |
752 | else if ((wanted_capability & CAP_SMUDGE) && !drv->process && drv->smudge) | |
753 | cmd = drv->smudge; | |
754 | ||
755 | if (cmd && *cmd) | |
756 | return apply_single_file_filter(path, src, len, fd, dst, cmd); | |
757 | else if (drv->process && *drv->process) | |
758 | return apply_multi_file_filter(path, src, len, fd, dst, | |
759 | drv->process, wanted_capability, dco); | |
760 | ||
761 | return 0; | |
762 | } | |
763 | ||
764 | static int read_convert_config(const char *var, const char *value, void *cb) | |
765 | { | |
766 | const char *key, *name; | |
767 | int namelen; | |
768 | struct convert_driver *drv; | |
769 | ||
770 | /* | |
771 | * External conversion drivers are configured using | |
772 | * "filter.<name>.variable". | |
773 | */ | |
774 | if (parse_config_key(var, "filter", &name, &namelen, &key) < 0 || !name) | |
775 | return 0; | |
776 | for (drv = user_convert; drv; drv = drv->next) | |
777 | if (!strncmp(drv->name, name, namelen) && !drv->name[namelen]) | |
778 | break; | |
779 | if (!drv) { | |
780 | drv = xcalloc(1, sizeof(struct convert_driver)); | |
781 | drv->name = xmemdupz(name, namelen); | |
782 | *user_convert_tail = drv; | |
783 | user_convert_tail = &(drv->next); | |
784 | } | |
785 | ||
786 | /* | |
787 | * filter.<name>.smudge and filter.<name>.clean specifies | |
788 | * the command line: | |
789 | * | |
790 | * command-line | |
791 | * | |
792 | * The command-line will not be interpolated in any way. | |
793 | */ | |
794 | ||
795 | if (!strcmp("smudge", key)) | |
796 | return git_config_string(&drv->smudge, var, value); | |
797 | ||
798 | if (!strcmp("clean", key)) | |
799 | return git_config_string(&drv->clean, var, value); | |
800 | ||
801 | if (!strcmp("process", key)) | |
802 | return git_config_string(&drv->process, var, value); | |
803 | ||
804 | if (!strcmp("required", key)) { | |
805 | drv->required = git_config_bool(var, value); | |
806 | return 0; | |
807 | } | |
808 | ||
809 | return 0; | |
810 | } | |
811 | ||
812 | static int count_ident(const char *cp, unsigned long size) | |
813 | { | |
814 | /* | |
815 | * "$Id: 0000000000000000000000000000000000000000 $" <=> "$Id$" | |
816 | */ | |
817 | int cnt = 0; | |
818 | char ch; | |
819 | ||
820 | while (size) { | |
821 | ch = *cp++; | |
822 | size--; | |
823 | if (ch != '$') | |
824 | continue; | |
825 | if (size < 3) | |
826 | break; | |
827 | if (memcmp("Id", cp, 2)) | |
828 | continue; | |
829 | ch = cp[2]; | |
830 | cp += 3; | |
831 | size -= 3; | |
832 | if (ch == '$') | |
833 | cnt++; /* $Id$ */ | |
834 | if (ch != ':') | |
835 | continue; | |
836 | ||
837 | /* | |
838 | * "$Id: ... "; scan up to the closing dollar sign and discard. | |
839 | */ | |
840 | while (size) { | |
841 | ch = *cp++; | |
842 | size--; | |
843 | if (ch == '$') { | |
844 | cnt++; | |
845 | break; | |
846 | } | |
847 | if (ch == '\n') | |
848 | break; | |
849 | } | |
850 | } | |
851 | return cnt; | |
852 | } | |
853 | ||
854 | static int ident_to_git(const char *path, const char *src, size_t len, | |
855 | struct strbuf *buf, int ident) | |
856 | { | |
857 | char *dst, *dollar; | |
858 | ||
859 | if (!ident || (src && !count_ident(src, len))) | |
860 | return 0; | |
861 | ||
862 | if (!buf) | |
863 | return 1; | |
864 | ||
865 | /* only grow if not in place */ | |
866 | if (strbuf_avail(buf) + buf->len < len) | |
867 | strbuf_grow(buf, len - buf->len); | |
868 | dst = buf->buf; | |
869 | for (;;) { | |
870 | dollar = memchr(src, '$', len); | |
871 | if (!dollar) | |
872 | break; | |
873 | memmove(dst, src, dollar + 1 - src); | |
874 | dst += dollar + 1 - src; | |
875 | len -= dollar + 1 - src; | |
876 | src = dollar + 1; | |
877 | ||
878 | if (len > 3 && !memcmp(src, "Id:", 3)) { | |
879 | dollar = memchr(src + 3, '$', len - 3); | |
880 | if (!dollar) | |
881 | break; | |
882 | if (memchr(src + 3, '\n', dollar - src - 3)) { | |
883 | /* Line break before the next dollar. */ | |
884 | continue; | |
885 | } | |
886 | ||
887 | memcpy(dst, "Id$", 3); | |
888 | dst += 3; | |
889 | len -= dollar + 1 - src; | |
890 | src = dollar + 1; | |
891 | } | |
892 | } | |
893 | memmove(dst, src, len); | |
894 | strbuf_setlen(buf, dst + len - buf->buf); | |
895 | return 1; | |
896 | } | |
897 | ||
898 | static int ident_to_worktree(const char *path, const char *src, size_t len, | |
899 | struct strbuf *buf, int ident) | |
900 | { | |
901 | struct object_id oid; | |
902 | char *to_free = NULL, *dollar, *spc; | |
903 | int cnt; | |
904 | ||
905 | if (!ident) | |
906 | return 0; | |
907 | ||
908 | cnt = count_ident(src, len); | |
909 | if (!cnt) | |
910 | return 0; | |
911 | ||
912 | /* are we "faking" in place editing ? */ | |
913 | if (src == buf->buf) | |
914 | to_free = strbuf_detach(buf, NULL); | |
915 | hash_object_file(src, len, "blob", &oid); | |
916 | ||
917 | strbuf_grow(buf, len + cnt * 43); | |
918 | for (;;) { | |
919 | /* step 1: run to the next '$' */ | |
920 | dollar = memchr(src, '$', len); | |
921 | if (!dollar) | |
922 | break; | |
923 | strbuf_add(buf, src, dollar + 1 - src); | |
924 | len -= dollar + 1 - src; | |
925 | src = dollar + 1; | |
926 | ||
927 | /* step 2: does it looks like a bit like Id:xxx$ or Id$ ? */ | |
928 | if (len < 3 || memcmp("Id", src, 2)) | |
929 | continue; | |
930 | ||
931 | /* step 3: skip over Id$ or Id:xxxxx$ */ | |
932 | if (src[2] == '$') { | |
933 | src += 3; | |
934 | len -= 3; | |
935 | } else if (src[2] == ':') { | |
936 | /* | |
937 | * It's possible that an expanded Id has crept its way into the | |
938 | * repository, we cope with that by stripping the expansion out. | |
939 | * This is probably not a good idea, since it will cause changes | |
940 | * on checkout, which won't go away by stash, but let's keep it | |
941 | * for git-style ids. | |
942 | */ | |
943 | dollar = memchr(src + 3, '$', len - 3); | |
944 | if (!dollar) { | |
945 | /* incomplete keyword, no more '$', so just quit the loop */ | |
946 | break; | |
947 | } | |
948 | ||
949 | if (memchr(src + 3, '\n', dollar - src - 3)) { | |
950 | /* Line break before the next dollar. */ | |
951 | continue; | |
952 | } | |
953 | ||
954 | spc = memchr(src + 4, ' ', dollar - src - 4); | |
955 | if (spc && spc < dollar-1) { | |
956 | /* There are spaces in unexpected places. | |
957 | * This is probably an id from some other | |
958 | * versioning system. Keep it for now. | |
959 | */ | |
960 | continue; | |
961 | } | |
962 | ||
963 | len -= dollar + 1 - src; | |
964 | src = dollar + 1; | |
965 | } else { | |
966 | /* it wasn't a "Id$" or "Id:xxxx$" */ | |
967 | continue; | |
968 | } | |
969 | ||
970 | /* step 4: substitute */ | |
971 | strbuf_addstr(buf, "Id: "); | |
972 | strbuf_addstr(buf, oid_to_hex(&oid)); | |
973 | strbuf_addstr(buf, " $"); | |
974 | } | |
975 | strbuf_add(buf, src, len); | |
976 | ||
977 | free(to_free); | |
978 | return 1; | |
979 | } | |
980 | ||
981 | static enum crlf_action git_path_check_crlf(struct attr_check_item *check) | |
982 | { | |
983 | const char *value = check->value; | |
984 | ||
985 | if (ATTR_TRUE(value)) | |
986 | return CRLF_TEXT; | |
987 | else if (ATTR_FALSE(value)) | |
988 | return CRLF_BINARY; | |
989 | else if (ATTR_UNSET(value)) | |
990 | ; | |
991 | else if (!strcmp(value, "input")) | |
992 | return CRLF_TEXT_INPUT; | |
993 | else if (!strcmp(value, "auto")) | |
994 | return CRLF_AUTO; | |
995 | return CRLF_UNDEFINED; | |
996 | } | |
997 | ||
998 | static enum eol git_path_check_eol(struct attr_check_item *check) | |
999 | { | |
1000 | const char *value = check->value; | |
1001 | ||
1002 | if (ATTR_UNSET(value)) | |
1003 | ; | |
1004 | else if (!strcmp(value, "lf")) | |
1005 | return EOL_LF; | |
1006 | else if (!strcmp(value, "crlf")) | |
1007 | return EOL_CRLF; | |
1008 | return EOL_UNSET; | |
1009 | } | |
1010 | ||
1011 | static struct convert_driver *git_path_check_convert(struct attr_check_item *check) | |
1012 | { | |
1013 | const char *value = check->value; | |
1014 | struct convert_driver *drv; | |
1015 | ||
1016 | if (ATTR_TRUE(value) || ATTR_FALSE(value) || ATTR_UNSET(value)) | |
1017 | return NULL; | |
1018 | for (drv = user_convert; drv; drv = drv->next) | |
1019 | if (!strcmp(value, drv->name)) | |
1020 | return drv; | |
1021 | return NULL; | |
1022 | } | |
1023 | ||
1024 | static int git_path_check_ident(struct attr_check_item *check) | |
1025 | { | |
1026 | const char *value = check->value; | |
1027 | ||
1028 | return !!ATTR_TRUE(value); | |
1029 | } | |
1030 | ||
1031 | struct conv_attrs { | |
1032 | struct convert_driver *drv; | |
1033 | enum crlf_action attr_action; /* What attr says */ | |
1034 | enum crlf_action crlf_action; /* When no attr is set, use core.autocrlf */ | |
1035 | int ident; | |
1036 | }; | |
1037 | ||
1038 | static void convert_attrs(struct conv_attrs *ca, const char *path) | |
1039 | { | |
1040 | static struct attr_check *check; | |
1041 | ||
1042 | if (!check) { | |
1043 | check = attr_check_initl("crlf", "ident", "filter", | |
1044 | "eol", "text", NULL); | |
1045 | user_convert_tail = &user_convert; | |
1046 | git_config(read_convert_config, NULL); | |
1047 | } | |
1048 | ||
1049 | if (!git_check_attr(path, check)) { | |
1050 | struct attr_check_item *ccheck = check->items; | |
1051 | ca->crlf_action = git_path_check_crlf(ccheck + 4); | |
1052 | if (ca->crlf_action == CRLF_UNDEFINED) | |
1053 | ca->crlf_action = git_path_check_crlf(ccheck + 0); | |
1054 | ca->ident = git_path_check_ident(ccheck + 1); | |
1055 | ca->drv = git_path_check_convert(ccheck + 2); | |
1056 | if (ca->crlf_action != CRLF_BINARY) { | |
1057 | enum eol eol_attr = git_path_check_eol(ccheck + 3); | |
1058 | if (ca->crlf_action == CRLF_AUTO && eol_attr == EOL_LF) | |
1059 | ca->crlf_action = CRLF_AUTO_INPUT; | |
1060 | else if (ca->crlf_action == CRLF_AUTO && eol_attr == EOL_CRLF) | |
1061 | ca->crlf_action = CRLF_AUTO_CRLF; | |
1062 | else if (eol_attr == EOL_LF) | |
1063 | ca->crlf_action = CRLF_TEXT_INPUT; | |
1064 | else if (eol_attr == EOL_CRLF) | |
1065 | ca->crlf_action = CRLF_TEXT_CRLF; | |
1066 | } | |
1067 | } else { | |
1068 | ca->drv = NULL; | |
1069 | ca->crlf_action = CRLF_UNDEFINED; | |
1070 | ca->ident = 0; | |
1071 | } | |
1072 | ||
1073 | /* Save attr and make a decision for action */ | |
1074 | ca->attr_action = ca->crlf_action; | |
1075 | if (ca->crlf_action == CRLF_TEXT) | |
1076 | ca->crlf_action = text_eol_is_crlf() ? CRLF_TEXT_CRLF : CRLF_TEXT_INPUT; | |
1077 | if (ca->crlf_action == CRLF_UNDEFINED && auto_crlf == AUTO_CRLF_FALSE) | |
1078 | ca->crlf_action = CRLF_BINARY; | |
1079 | if (ca->crlf_action == CRLF_UNDEFINED && auto_crlf == AUTO_CRLF_TRUE) | |
1080 | ca->crlf_action = CRLF_AUTO_CRLF; | |
1081 | if (ca->crlf_action == CRLF_UNDEFINED && auto_crlf == AUTO_CRLF_INPUT) | |
1082 | ca->crlf_action = CRLF_AUTO_INPUT; | |
1083 | } | |
1084 | ||
1085 | int would_convert_to_git_filter_fd(const char *path) | |
1086 | { | |
1087 | struct conv_attrs ca; | |
1088 | ||
1089 | convert_attrs(&ca, path); | |
1090 | if (!ca.drv) | |
1091 | return 0; | |
1092 | ||
1093 | /* | |
1094 | * Apply a filter to an fd only if the filter is required to succeed. | |
1095 | * We must die if the filter fails, because the original data before | |
1096 | * filtering is not available. | |
1097 | */ | |
1098 | if (!ca.drv->required) | |
1099 | return 0; | |
1100 | ||
1101 | return apply_filter(path, NULL, 0, -1, NULL, ca.drv, CAP_CLEAN, NULL); | |
1102 | } | |
1103 | ||
1104 | const char *get_convert_attr_ascii(const char *path) | |
1105 | { | |
1106 | struct conv_attrs ca; | |
1107 | ||
1108 | convert_attrs(&ca, path); | |
1109 | switch (ca.attr_action) { | |
1110 | case CRLF_UNDEFINED: | |
1111 | return ""; | |
1112 | case CRLF_BINARY: | |
1113 | return "-text"; | |
1114 | case CRLF_TEXT: | |
1115 | return "text"; | |
1116 | case CRLF_TEXT_INPUT: | |
1117 | return "text eol=lf"; | |
1118 | case CRLF_TEXT_CRLF: | |
1119 | return "text eol=crlf"; | |
1120 | case CRLF_AUTO: | |
1121 | return "text=auto"; | |
1122 | case CRLF_AUTO_CRLF: | |
1123 | return "text=auto eol=crlf"; | |
1124 | case CRLF_AUTO_INPUT: | |
1125 | return "text=auto eol=lf"; | |
1126 | } | |
1127 | return ""; | |
1128 | } | |
1129 | ||
1130 | int convert_to_git(const struct index_state *istate, | |
1131 | const char *path, const char *src, size_t len, | |
1132 | struct strbuf *dst, int conv_flags) | |
1133 | { | |
1134 | int ret = 0; | |
1135 | struct conv_attrs ca; | |
1136 | ||
1137 | convert_attrs(&ca, path); | |
1138 | ||
1139 | ret |= apply_filter(path, src, len, -1, dst, ca.drv, CAP_CLEAN, NULL); | |
1140 | if (!ret && ca.drv && ca.drv->required) | |
1141 | die("%s: clean filter '%s' failed", path, ca.drv->name); | |
1142 | ||
1143 | if (ret && dst) { | |
1144 | src = dst->buf; | |
1145 | len = dst->len; | |
1146 | } | |
1147 | if (!(conv_flags & CONV_EOL_KEEP_CRLF)) { | |
1148 | ret |= crlf_to_git(istate, path, src, len, dst, ca.crlf_action, conv_flags); | |
1149 | if (ret && dst) { | |
1150 | src = dst->buf; | |
1151 | len = dst->len; | |
1152 | } | |
1153 | } | |
1154 | return ret | ident_to_git(path, src, len, dst, ca.ident); | |
1155 | } | |
1156 | ||
1157 | void convert_to_git_filter_fd(const struct index_state *istate, | |
1158 | const char *path, int fd, struct strbuf *dst, | |
1159 | int conv_flags) | |
1160 | { | |
1161 | struct conv_attrs ca; | |
1162 | convert_attrs(&ca, path); | |
1163 | ||
1164 | assert(ca.drv); | |
1165 | assert(ca.drv->clean || ca.drv->process); | |
1166 | ||
1167 | if (!apply_filter(path, NULL, 0, fd, dst, ca.drv, CAP_CLEAN, NULL)) | |
1168 | die("%s: clean filter '%s' failed", path, ca.drv->name); | |
1169 | ||
1170 | crlf_to_git(istate, path, dst->buf, dst->len, dst, ca.crlf_action, conv_flags); | |
1171 | ident_to_git(path, dst->buf, dst->len, dst, ca.ident); | |
1172 | } | |
1173 | ||
1174 | static int convert_to_working_tree_internal(const char *path, const char *src, | |
1175 | size_t len, struct strbuf *dst, | |
1176 | int normalizing, struct delayed_checkout *dco) | |
1177 | { | |
1178 | int ret = 0, ret_filter = 0; | |
1179 | struct conv_attrs ca; | |
1180 | ||
1181 | convert_attrs(&ca, path); | |
1182 | ||
1183 | ret |= ident_to_worktree(path, src, len, dst, ca.ident); | |
1184 | if (ret) { | |
1185 | src = dst->buf; | |
1186 | len = dst->len; | |
1187 | } | |
1188 | /* | |
1189 | * CRLF conversion can be skipped if normalizing, unless there | |
1190 | * is a smudge or process filter (even if the process filter doesn't | |
1191 | * support smudge). The filters might expect CRLFs. | |
1192 | */ | |
1193 | if ((ca.drv && (ca.drv->smudge || ca.drv->process)) || !normalizing) { | |
1194 | ret |= crlf_to_worktree(path, src, len, dst, ca.crlf_action); | |
1195 | if (ret) { | |
1196 | src = dst->buf; | |
1197 | len = dst->len; | |
1198 | } | |
1199 | } | |
1200 | ||
1201 | ret_filter = apply_filter( | |
1202 | path, src, len, -1, dst, ca.drv, CAP_SMUDGE, dco); | |
1203 | if (!ret_filter && ca.drv && ca.drv->required) | |
1204 | die("%s: smudge filter %s failed", path, ca.drv->name); | |
1205 | ||
1206 | return ret | ret_filter; | |
1207 | } | |
1208 | ||
1209 | int async_convert_to_working_tree(const char *path, const char *src, | |
1210 | size_t len, struct strbuf *dst, | |
1211 | void *dco) | |
1212 | { | |
1213 | return convert_to_working_tree_internal(path, src, len, dst, 0, dco); | |
1214 | } | |
1215 | ||
1216 | int convert_to_working_tree(const char *path, const char *src, size_t len, struct strbuf *dst) | |
1217 | { | |
1218 | return convert_to_working_tree_internal(path, src, len, dst, 0, NULL); | |
1219 | } | |
1220 | ||
1221 | int renormalize_buffer(const struct index_state *istate, const char *path, | |
1222 | const char *src, size_t len, struct strbuf *dst) | |
1223 | { | |
1224 | int ret = convert_to_working_tree_internal(path, src, len, dst, 1, NULL); | |
1225 | if (ret) { | |
1226 | src = dst->buf; | |
1227 | len = dst->len; | |
1228 | } | |
1229 | return ret | convert_to_git(istate, path, src, len, dst, CONV_EOL_RENORMALIZE); | |
1230 | } | |
1231 | ||
1232 | /***************************************************************** | |
1233 | * | |
1234 | * Streaming conversion support | |
1235 | * | |
1236 | *****************************************************************/ | |
1237 | ||
1238 | typedef int (*filter_fn)(struct stream_filter *, | |
1239 | const char *input, size_t *isize_p, | |
1240 | char *output, size_t *osize_p); | |
1241 | typedef void (*free_fn)(struct stream_filter *); | |
1242 | ||
1243 | struct stream_filter_vtbl { | |
1244 | filter_fn filter; | |
1245 | free_fn free; | |
1246 | }; | |
1247 | ||
1248 | struct stream_filter { | |
1249 | struct stream_filter_vtbl *vtbl; | |
1250 | }; | |
1251 | ||
1252 | static int null_filter_fn(struct stream_filter *filter, | |
1253 | const char *input, size_t *isize_p, | |
1254 | char *output, size_t *osize_p) | |
1255 | { | |
1256 | size_t count; | |
1257 | ||
1258 | if (!input) | |
1259 | return 0; /* we do not keep any states */ | |
1260 | count = *isize_p; | |
1261 | if (*osize_p < count) | |
1262 | count = *osize_p; | |
1263 | if (count) { | |
1264 | memmove(output, input, count); | |
1265 | *isize_p -= count; | |
1266 | *osize_p -= count; | |
1267 | } | |
1268 | return 0; | |
1269 | } | |
1270 | ||
1271 | static void null_free_fn(struct stream_filter *filter) | |
1272 | { | |
1273 | ; /* nothing -- null instances are shared */ | |
1274 | } | |
1275 | ||
1276 | static struct stream_filter_vtbl null_vtbl = { | |
1277 | null_filter_fn, | |
1278 | null_free_fn, | |
1279 | }; | |
1280 | ||
1281 | static struct stream_filter null_filter_singleton = { | |
1282 | &null_vtbl, | |
1283 | }; | |
1284 | ||
1285 | int is_null_stream_filter(struct stream_filter *filter) | |
1286 | { | |
1287 | return filter == &null_filter_singleton; | |
1288 | } | |
1289 | ||
1290 | ||
1291 | /* | |
1292 | * LF-to-CRLF filter | |
1293 | */ | |
1294 | ||
1295 | struct lf_to_crlf_filter { | |
1296 | struct stream_filter filter; | |
1297 | unsigned has_held:1; | |
1298 | char held; | |
1299 | }; | |
1300 | ||
1301 | static int lf_to_crlf_filter_fn(struct stream_filter *filter, | |
1302 | const char *input, size_t *isize_p, | |
1303 | char *output, size_t *osize_p) | |
1304 | { | |
1305 | size_t count, o = 0; | |
1306 | struct lf_to_crlf_filter *lf_to_crlf = (struct lf_to_crlf_filter *)filter; | |
1307 | ||
1308 | /* | |
1309 | * We may be holding onto the CR to see if it is followed by a | |
1310 | * LF, in which case we would need to go to the main loop. | |
1311 | * Otherwise, just emit it to the output stream. | |
1312 | */ | |
1313 | if (lf_to_crlf->has_held && (lf_to_crlf->held != '\r' || !input)) { | |
1314 | output[o++] = lf_to_crlf->held; | |
1315 | lf_to_crlf->has_held = 0; | |
1316 | } | |
1317 | ||
1318 | /* We are told to drain */ | |
1319 | if (!input) { | |
1320 | *osize_p -= o; | |
1321 | return 0; | |
1322 | } | |
1323 | ||
1324 | count = *isize_p; | |
1325 | if (count || lf_to_crlf->has_held) { | |
1326 | size_t i; | |
1327 | int was_cr = 0; | |
1328 | ||
1329 | if (lf_to_crlf->has_held) { | |
1330 | was_cr = 1; | |
1331 | lf_to_crlf->has_held = 0; | |
1332 | } | |
1333 | ||
1334 | for (i = 0; o < *osize_p && i < count; i++) { | |
1335 | char ch = input[i]; | |
1336 | ||
1337 | if (ch == '\n') { | |
1338 | output[o++] = '\r'; | |
1339 | } else if (was_cr) { | |
1340 | /* | |
1341 | * Previous round saw CR and it is not followed | |
1342 | * by a LF; emit the CR before processing the | |
1343 | * current character. | |
1344 | */ | |
1345 | output[o++] = '\r'; | |
1346 | } | |
1347 | ||
1348 | /* | |
1349 | * We may have consumed the last output slot, | |
1350 | * in which case we need to break out of this | |
1351 | * loop; hold the current character before | |
1352 | * returning. | |
1353 | */ | |
1354 | if (*osize_p <= o) { | |
1355 | lf_to_crlf->has_held = 1; | |
1356 | lf_to_crlf->held = ch; | |
1357 | continue; /* break but increment i */ | |
1358 | } | |
1359 | ||
1360 | if (ch == '\r') { | |
1361 | was_cr = 1; | |
1362 | continue; | |
1363 | } | |
1364 | ||
1365 | was_cr = 0; | |
1366 | output[o++] = ch; | |
1367 | } | |
1368 | ||
1369 | *osize_p -= o; | |
1370 | *isize_p -= i; | |
1371 | ||
1372 | if (!lf_to_crlf->has_held && was_cr) { | |
1373 | lf_to_crlf->has_held = 1; | |
1374 | lf_to_crlf->held = '\r'; | |
1375 | } | |
1376 | } | |
1377 | return 0; | |
1378 | } | |
1379 | ||
1380 | static void lf_to_crlf_free_fn(struct stream_filter *filter) | |
1381 | { | |
1382 | free(filter); | |
1383 | } | |
1384 | ||
1385 | static struct stream_filter_vtbl lf_to_crlf_vtbl = { | |
1386 | lf_to_crlf_filter_fn, | |
1387 | lf_to_crlf_free_fn, | |
1388 | }; | |
1389 | ||
1390 | static struct stream_filter *lf_to_crlf_filter(void) | |
1391 | { | |
1392 | struct lf_to_crlf_filter *lf_to_crlf = xcalloc(1, sizeof(*lf_to_crlf)); | |
1393 | ||
1394 | lf_to_crlf->filter.vtbl = &lf_to_crlf_vtbl; | |
1395 | return (struct stream_filter *)lf_to_crlf; | |
1396 | } | |
1397 | ||
1398 | /* | |
1399 | * Cascade filter | |
1400 | */ | |
1401 | #define FILTER_BUFFER 1024 | |
1402 | struct cascade_filter { | |
1403 | struct stream_filter filter; | |
1404 | struct stream_filter *one; | |
1405 | struct stream_filter *two; | |
1406 | char buf[FILTER_BUFFER]; | |
1407 | int end, ptr; | |
1408 | }; | |
1409 | ||
1410 | static int cascade_filter_fn(struct stream_filter *filter, | |
1411 | const char *input, size_t *isize_p, | |
1412 | char *output, size_t *osize_p) | |
1413 | { | |
1414 | struct cascade_filter *cas = (struct cascade_filter *) filter; | |
1415 | size_t filled = 0; | |
1416 | size_t sz = *osize_p; | |
1417 | size_t to_feed, remaining; | |
1418 | ||
1419 | /* | |
1420 | * input -- (one) --> buf -- (two) --> output | |
1421 | */ | |
1422 | while (filled < sz) { | |
1423 | remaining = sz - filled; | |
1424 | ||
1425 | /* do we already have something to feed two with? */ | |
1426 | if (cas->ptr < cas->end) { | |
1427 | to_feed = cas->end - cas->ptr; | |
1428 | if (stream_filter(cas->two, | |
1429 | cas->buf + cas->ptr, &to_feed, | |
1430 | output + filled, &remaining)) | |
1431 | return -1; | |
1432 | cas->ptr += (cas->end - cas->ptr) - to_feed; | |
1433 | filled = sz - remaining; | |
1434 | continue; | |
1435 | } | |
1436 | ||
1437 | /* feed one from upstream and have it emit into our buffer */ | |
1438 | to_feed = input ? *isize_p : 0; | |
1439 | if (input && !to_feed) | |
1440 | break; | |
1441 | remaining = sizeof(cas->buf); | |
1442 | if (stream_filter(cas->one, | |
1443 | input, &to_feed, | |
1444 | cas->buf, &remaining)) | |
1445 | return -1; | |
1446 | cas->end = sizeof(cas->buf) - remaining; | |
1447 | cas->ptr = 0; | |
1448 | if (input) { | |
1449 | size_t fed = *isize_p - to_feed; | |
1450 | *isize_p -= fed; | |
1451 | input += fed; | |
1452 | } | |
1453 | ||
1454 | /* do we know that we drained one completely? */ | |
1455 | if (input || cas->end) | |
1456 | continue; | |
1457 | ||
1458 | /* tell two to drain; we have nothing more to give it */ | |
1459 | to_feed = 0; | |
1460 | remaining = sz - filled; | |
1461 | if (stream_filter(cas->two, | |
1462 | NULL, &to_feed, | |
1463 | output + filled, &remaining)) | |
1464 | return -1; | |
1465 | if (remaining == (sz - filled)) | |
1466 | break; /* completely drained two */ | |
1467 | filled = sz - remaining; | |
1468 | } | |
1469 | *osize_p -= filled; | |
1470 | return 0; | |
1471 | } | |
1472 | ||
1473 | static void cascade_free_fn(struct stream_filter *filter) | |
1474 | { | |
1475 | struct cascade_filter *cas = (struct cascade_filter *)filter; | |
1476 | free_stream_filter(cas->one); | |
1477 | free_stream_filter(cas->two); | |
1478 | free(filter); | |
1479 | } | |
1480 | ||
1481 | static struct stream_filter_vtbl cascade_vtbl = { | |
1482 | cascade_filter_fn, | |
1483 | cascade_free_fn, | |
1484 | }; | |
1485 | ||
1486 | static struct stream_filter *cascade_filter(struct stream_filter *one, | |
1487 | struct stream_filter *two) | |
1488 | { | |
1489 | struct cascade_filter *cascade; | |
1490 | ||
1491 | if (!one || is_null_stream_filter(one)) | |
1492 | return two; | |
1493 | if (!two || is_null_stream_filter(two)) | |
1494 | return one; | |
1495 | ||
1496 | cascade = xmalloc(sizeof(*cascade)); | |
1497 | cascade->one = one; | |
1498 | cascade->two = two; | |
1499 | cascade->end = cascade->ptr = 0; | |
1500 | cascade->filter.vtbl = &cascade_vtbl; | |
1501 | return (struct stream_filter *)cascade; | |
1502 | } | |
1503 | ||
1504 | /* | |
1505 | * ident filter | |
1506 | */ | |
1507 | #define IDENT_DRAINING (-1) | |
1508 | #define IDENT_SKIPPING (-2) | |
1509 | struct ident_filter { | |
1510 | struct stream_filter filter; | |
1511 | struct strbuf left; | |
1512 | int state; | |
1513 | char ident[45]; /* ": x40 $" */ | |
1514 | }; | |
1515 | ||
1516 | static int is_foreign_ident(const char *str) | |
1517 | { | |
1518 | int i; | |
1519 | ||
1520 | if (!skip_prefix(str, "$Id: ", &str)) | |
1521 | return 0; | |
1522 | for (i = 0; str[i]; i++) { | |
1523 | if (isspace(str[i]) && str[i+1] != '$') | |
1524 | return 1; | |
1525 | } | |
1526 | return 0; | |
1527 | } | |
1528 | ||
1529 | static void ident_drain(struct ident_filter *ident, char **output_p, size_t *osize_p) | |
1530 | { | |
1531 | size_t to_drain = ident->left.len; | |
1532 | ||
1533 | if (*osize_p < to_drain) | |
1534 | to_drain = *osize_p; | |
1535 | if (to_drain) { | |
1536 | memcpy(*output_p, ident->left.buf, to_drain); | |
1537 | strbuf_remove(&ident->left, 0, to_drain); | |
1538 | *output_p += to_drain; | |
1539 | *osize_p -= to_drain; | |
1540 | } | |
1541 | if (!ident->left.len) | |
1542 | ident->state = 0; | |
1543 | } | |
1544 | ||
1545 | static int ident_filter_fn(struct stream_filter *filter, | |
1546 | const char *input, size_t *isize_p, | |
1547 | char *output, size_t *osize_p) | |
1548 | { | |
1549 | struct ident_filter *ident = (struct ident_filter *)filter; | |
1550 | static const char head[] = "$Id"; | |
1551 | ||
1552 | if (!input) { | |
1553 | /* drain upon eof */ | |
1554 | switch (ident->state) { | |
1555 | default: | |
1556 | strbuf_add(&ident->left, head, ident->state); | |
1557 | /* fallthrough */ | |
1558 | case IDENT_SKIPPING: | |
1559 | /* fallthrough */ | |
1560 | case IDENT_DRAINING: | |
1561 | ident_drain(ident, &output, osize_p); | |
1562 | } | |
1563 | return 0; | |
1564 | } | |
1565 | ||
1566 | while (*isize_p || (ident->state == IDENT_DRAINING)) { | |
1567 | int ch; | |
1568 | ||
1569 | if (ident->state == IDENT_DRAINING) { | |
1570 | ident_drain(ident, &output, osize_p); | |
1571 | if (!*osize_p) | |
1572 | break; | |
1573 | continue; | |
1574 | } | |
1575 | ||
1576 | ch = *(input++); | |
1577 | (*isize_p)--; | |
1578 | ||
1579 | if (ident->state == IDENT_SKIPPING) { | |
1580 | /* | |
1581 | * Skipping until '$' or LF, but keeping them | |
1582 | * in case it is a foreign ident. | |
1583 | */ | |
1584 | strbuf_addch(&ident->left, ch); | |
1585 | if (ch != '\n' && ch != '$') | |
1586 | continue; | |
1587 | if (ch == '$' && !is_foreign_ident(ident->left.buf)) { | |
1588 | strbuf_setlen(&ident->left, sizeof(head) - 1); | |
1589 | strbuf_addstr(&ident->left, ident->ident); | |
1590 | } | |
1591 | ident->state = IDENT_DRAINING; | |
1592 | continue; | |
1593 | } | |
1594 | ||
1595 | if (ident->state < sizeof(head) && | |
1596 | head[ident->state] == ch) { | |
1597 | ident->state++; | |
1598 | continue; | |
1599 | } | |
1600 | ||
1601 | if (ident->state) | |
1602 | strbuf_add(&ident->left, head, ident->state); | |
1603 | if (ident->state == sizeof(head) - 1) { | |
1604 | if (ch != ':' && ch != '$') { | |
1605 | strbuf_addch(&ident->left, ch); | |
1606 | ident->state = 0; | |
1607 | continue; | |
1608 | } | |
1609 | ||
1610 | if (ch == ':') { | |
1611 | strbuf_addch(&ident->left, ch); | |
1612 | ident->state = IDENT_SKIPPING; | |
1613 | } else { | |
1614 | strbuf_addstr(&ident->left, ident->ident); | |
1615 | ident->state = IDENT_DRAINING; | |
1616 | } | |
1617 | continue; | |
1618 | } | |
1619 | ||
1620 | strbuf_addch(&ident->left, ch); | |
1621 | ident->state = IDENT_DRAINING; | |
1622 | } | |
1623 | return 0; | |
1624 | } | |
1625 | ||
1626 | static void ident_free_fn(struct stream_filter *filter) | |
1627 | { | |
1628 | struct ident_filter *ident = (struct ident_filter *)filter; | |
1629 | strbuf_release(&ident->left); | |
1630 | free(filter); | |
1631 | } | |
1632 | ||
1633 | static struct stream_filter_vtbl ident_vtbl = { | |
1634 | ident_filter_fn, | |
1635 | ident_free_fn, | |
1636 | }; | |
1637 | ||
1638 | static struct stream_filter *ident_filter(const unsigned char *sha1) | |
1639 | { | |
1640 | struct ident_filter *ident = xmalloc(sizeof(*ident)); | |
1641 | ||
1642 | xsnprintf(ident->ident, sizeof(ident->ident), | |
1643 | ": %s $", sha1_to_hex(sha1)); | |
1644 | strbuf_init(&ident->left, 0); | |
1645 | ident->filter.vtbl = &ident_vtbl; | |
1646 | ident->state = 0; | |
1647 | return (struct stream_filter *)ident; | |
1648 | } | |
1649 | ||
1650 | /* | |
1651 | * Return an appropriately constructed filter for the path, or NULL if | |
1652 | * the contents cannot be filtered without reading the whole thing | |
1653 | * in-core. | |
1654 | * | |
1655 | * Note that you would be crazy to set CRLF, smuge/clean or ident to a | |
1656 | * large binary blob you would want us not to slurp into the memory! | |
1657 | */ | |
1658 | struct stream_filter *get_stream_filter(const char *path, const unsigned char *sha1) | |
1659 | { | |
1660 | struct conv_attrs ca; | |
1661 | struct stream_filter *filter = NULL; | |
1662 | ||
1663 | convert_attrs(&ca, path); | |
1664 | if (ca.drv && (ca.drv->process || ca.drv->smudge || ca.drv->clean)) | |
1665 | return NULL; | |
1666 | ||
1667 | if (ca.crlf_action == CRLF_AUTO || ca.crlf_action == CRLF_AUTO_CRLF) | |
1668 | return NULL; | |
1669 | ||
1670 | if (ca.ident) | |
1671 | filter = ident_filter(sha1); | |
1672 | ||
1673 | if (output_eol(ca.crlf_action) == EOL_CRLF) | |
1674 | filter = cascade_filter(filter, lf_to_crlf_filter()); | |
1675 | else | |
1676 | filter = cascade_filter(filter, &null_filter_singleton); | |
1677 | ||
1678 | return filter; | |
1679 | } | |
1680 | ||
1681 | void free_stream_filter(struct stream_filter *filter) | |
1682 | { | |
1683 | filter->vtbl->free(filter); | |
1684 | } | |
1685 | ||
1686 | int stream_filter(struct stream_filter *filter, | |
1687 | const char *input, size_t *isize_p, | |
1688 | char *output, size_t *osize_p) | |
1689 | { | |
1690 | return filter->vtbl->filter(filter, input, isize_p, output, osize_p); | |
1691 | } |