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Documentation/gitprotocol-v2.txt: fix a slight inconsistency in format
[git/gitster.git] / convert.c
bloba54d1690c083178fd0c1356c8c8c8bee5cfdbda1
1 #include "cache.h"
2 #include "config.h"
3 #include "object-store.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 #include "utf8.h"
11 #include "ll-merge.h"
12
13 /*
14 * convert.c - convert a file when checking it out and checking it in.
15 *
16 * This should use the pathname to decide on whether it wants to do some
17 * more interesting conversions (automatic gzip/unzip, general format
18 * conversions etc etc), but by default it just does automatic CRLF<->LF
19 * translation when the "text" attribute or "auto_crlf" option is set.
20 */
21
22 /* Stat bits: When BIN is set, the txt bits are unset */
23 #define CONVERT_STAT_BITS_TXT_LF 0x1
24 #define CONVERT_STAT_BITS_TXT_CRLF 0x2
25 #define CONVERT_STAT_BITS_BIN 0x4
26
27 struct text_stat {
28 /* NUL, CR, LF and CRLF counts */
29 unsigned nul, lonecr, lonelf, crlf;
30
31 /* These are just approximations! */
32 unsigned printable, nonprintable;
33 };
34
35 static void gather_stats(const char *buf, unsigned long size, struct text_stat *stats)
36 {
37 unsigned long i;
38
39 memset(stats, 0, sizeof(*stats));
40
41 for (i = 0; i < size; i++) {
42 unsigned char c = buf[i];
43 if (c == '\r') {
44 if (i+1 < size && buf[i+1] == '\n') {
45 stats->crlf++;
46 i++;
47 } else
48 stats->lonecr++;
49 continue;
50 }
51 if (c == '\n') {
52 stats->lonelf++;
53 continue;
54 }
55 if (c == 127)
56 /* DEL */
57 stats->nonprintable++;
58 else if (c < 32) {
59 switch (c) {
60 /* BS, HT, ESC and FF */
61 case '\b': case '\t': case '\033': case '\014':
62 stats->printable++;
63 break;
64 case 0:
65 stats->nul++;
66 /* fall through */
67 default:
68 stats->nonprintable++;
69 }
70 }
71 else
72 stats->printable++;
73 }
74
75 /* If file ends with EOF then don't count this EOF as non-printable. */
76 if (size >= 1 && buf[size-1] == '\032')
77 stats->nonprintable--;
78 }
79
80 /*
81 * The same heuristics as diff.c::mmfile_is_binary()
82 * We treat files with bare CR as binary
83 */
84 static int convert_is_binary(const struct text_stat *stats)
85 {
86 if (stats->lonecr)
87 return 1;
88 if (stats->nul)
89 return 1;
90 if ((stats->printable >> 7) < stats->nonprintable)
91 return 1;
92 return 0;
93 }
94
95 static unsigned int gather_convert_stats(const char *data, unsigned long size)
96 {
97 struct text_stat stats;
98 int ret = 0;
99 if (!data || !size)
100 return 0;
101 gather_stats(data, size, &stats);
102 if (convert_is_binary(&stats))
103 ret |= CONVERT_STAT_BITS_BIN;
104 if (stats.crlf)
105 ret |= CONVERT_STAT_BITS_TXT_CRLF;
106 if (stats.lonelf)
107 ret |= CONVERT_STAT_BITS_TXT_LF;
108
109 return ret;
110 }
111
112 static const char *gather_convert_stats_ascii(const char *data, unsigned long size)
113 {
114 unsigned int convert_stats = gather_convert_stats(data, size);
115
116 if (convert_stats & CONVERT_STAT_BITS_BIN)
117 return "-text";
118 switch (convert_stats) {
119 case CONVERT_STAT_BITS_TXT_LF:
120 return "lf";
121 case CONVERT_STAT_BITS_TXT_CRLF:
122 return "crlf";
123 case CONVERT_STAT_BITS_TXT_LF | CONVERT_STAT_BITS_TXT_CRLF:
124 return "mixed";
125 default:
126 return "none";
127 }
128 }
129
130 const char *get_cached_convert_stats_ascii(struct index_state *istate,
131 const char *path)
132 {
133 const char *ret;
134 unsigned long sz;
135 void *data = read_blob_data_from_index(istate, path, &sz);
136 ret = gather_convert_stats_ascii(data, sz);
137 free(data);
138 return ret;
139 }
140
141 const char *get_wt_convert_stats_ascii(const char *path)
142 {
143 const char *ret = "";
144 struct strbuf sb = STRBUF_INIT;
145 if (strbuf_read_file(&sb, path, 0) >= 0)
146 ret = gather_convert_stats_ascii(sb.buf, sb.len);
147 strbuf_release(&sb);
148 return ret;
149 }
150
151 static int text_eol_is_crlf(void)
152 {
153 if (auto_crlf == AUTO_CRLF_TRUE)
154 return 1;
155 else if (auto_crlf == AUTO_CRLF_INPUT)
156 return 0;
157 if (core_eol == EOL_CRLF)
158 return 1;
159 if (core_eol == EOL_UNSET && EOL_NATIVE == EOL_CRLF)
160 return 1;
161 return 0;
162 }
163
164 static enum eol output_eol(enum convert_crlf_action crlf_action)
165 {
166 switch (crlf_action) {
167 case CRLF_BINARY:
168 return EOL_UNSET;
169 case CRLF_TEXT_CRLF:
170 return EOL_CRLF;
171 case CRLF_TEXT_INPUT:
172 return EOL_LF;
173 case CRLF_UNDEFINED:
174 case CRLF_AUTO_CRLF:
175 return EOL_CRLF;
176 case CRLF_AUTO_INPUT:
177 return EOL_LF;
178 case CRLF_TEXT:
179 case CRLF_AUTO:
180 /* fall through */
181 return text_eol_is_crlf() ? EOL_CRLF : EOL_LF;
182 }
183 warning(_("illegal crlf_action %d"), (int)crlf_action);
184 return core_eol;
185 }
186
187 static void check_global_conv_flags_eol(const char *path,
188 struct text_stat *old_stats, struct text_stat *new_stats,
189 int conv_flags)
190 {
191 if (old_stats->crlf && !new_stats->crlf ) {
192 /*
193 * CRLFs would not be restored by checkout
194 */
195 if (conv_flags & CONV_EOL_RNDTRP_DIE)
196 die(_("CRLF would be replaced by LF in %s"), path);
197 else if (conv_flags & CONV_EOL_RNDTRP_WARN)
198 warning(_("in the working copy of '%s', CRLF will be"
199 " replaced by LF the next time Git touches"
200 " it"), path);
201 } else if (old_stats->lonelf && !new_stats->lonelf ) {
202 /*
203 * CRLFs would be added by checkout
204 */
205 if (conv_flags & CONV_EOL_RNDTRP_DIE)
206 die(_("LF would be replaced by CRLF in %s"), path);
207 else if (conv_flags & CONV_EOL_RNDTRP_WARN)
208 warning(_("in the working copy of '%s', LF will be"
209 " replaced by CRLF the next time Git touches"
210 " it"), path);
211 }
212 }
213
214 static int has_crlf_in_index(struct index_state *istate, const char *path)
215 {
216 unsigned long sz;
217 void *data;
218 const char *crp;
219 int has_crlf = 0;
220
221 data = read_blob_data_from_index(istate, path, &sz);
222 if (!data)
223 return 0;
224
225 crp = memchr(data, '\r', sz);
226 if (crp) {
227 unsigned int ret_stats;
228 ret_stats = gather_convert_stats(data, sz);
229 if (!(ret_stats & CONVERT_STAT_BITS_BIN) &&
230 (ret_stats & CONVERT_STAT_BITS_TXT_CRLF))
231 has_crlf = 1;
232 }
233 free(data);
234 return has_crlf;
235 }
236
237 static int will_convert_lf_to_crlf(struct text_stat *stats,
238 enum convert_crlf_action crlf_action)
239 {
240 if (output_eol(crlf_action) != EOL_CRLF)
241 return 0;
242 /* No "naked" LF? Nothing to convert, regardless. */
243 if (!stats->lonelf)
244 return 0;
245
246 if (crlf_action == CRLF_AUTO || crlf_action == CRLF_AUTO_INPUT || crlf_action == CRLF_AUTO_CRLF) {
247 /* If we have any CR or CRLF line endings, we do not touch it */
248 /* This is the new safer autocrlf-handling */
249 if (stats->lonecr || stats->crlf)
250 return 0;
251
252 if (convert_is_binary(stats))
253 return 0;
254 }
255 return 1;
256
257 }
258
259 static int validate_encoding(const char *path, const char *enc,
260 const char *data, size_t len, int die_on_error)
261 {
262 const char *stripped;
263
264 /* We only check for UTF here as UTF?? can be an alias for UTF-?? */
265 if (skip_iprefix(enc, "UTF", &stripped)) {
266 skip_prefix(stripped, "-", &stripped);
267
268 /*
269 * Check for detectable errors in UTF encodings
270 */
271 if (has_prohibited_utf_bom(enc, data, len)) {
272 const char *error_msg = _(
273 "BOM is prohibited in '%s' if encoded as %s");
274 /*
275 * This advice is shown for UTF-??BE and UTF-??LE encodings.
276 * We cut off the last two characters of the encoding name
277 * to generate the encoding name suitable for BOMs.
278 */
279 const char *advise_msg = _(
280 "The file '%s' contains a byte order "
281 "mark (BOM). Please use UTF-%.*s as "
282 "working-tree-encoding.");
283 int stripped_len = strlen(stripped) - strlen("BE");
284 advise(advise_msg, path, stripped_len, stripped);
285 if (die_on_error)
286 die(error_msg, path, enc);
287 else {
288 return error(error_msg, path, enc);
289 }
290
291 } else if (is_missing_required_utf_bom(enc, data, len)) {
292 const char *error_msg = _(
293 "BOM is required in '%s' if encoded as %s");
294 const char *advise_msg = _(
295 "The file '%s' is missing a byte order "
296 "mark (BOM). Please use UTF-%sBE or UTF-%sLE "
297 "(depending on the byte order) as "
298 "working-tree-encoding.");
299 advise(advise_msg, path, stripped, stripped);
300 if (die_on_error)
301 die(error_msg, path, enc);
302 else {
303 return error(error_msg, path, enc);
304 }
305 }
306
307 }
308 return 0;
309 }
310
311 static void trace_encoding(const char *context, const char *path,
312 const char *encoding, const char *buf, size_t len)
313 {
314 static struct trace_key coe = TRACE_KEY_INIT(WORKING_TREE_ENCODING);
315 struct strbuf trace = STRBUF_INIT;
316 int i;
317
318 strbuf_addf(&trace, "%s (%s, considered %s):\n", context, path, encoding);
319 for (i = 0; i < len && buf; ++i) {
320 strbuf_addf(
321 &trace, "| \033[2m%2i:\033[0m %2x \033[2m%c\033[0m%c",
322 i,
323 (unsigned char) buf[i],
324 (buf[i] > 32 && buf[i] < 127 ? buf[i] : ' '),
325 ((i+1) % 8 && (i+1) < len ? ' ' : '\n')
326 );
327 }
328 strbuf_addchars(&trace, '\n', 1);
329
330 trace_strbuf(&coe, &trace);
331 strbuf_release(&trace);
332 }
333
334 static int check_roundtrip(const char *enc_name)
335 {
336 /*
337 * check_roundtrip_encoding contains a string of comma and/or
338 * space separated encodings (eg. "UTF-16, ASCII, CP1125").
339 * Search for the given encoding in that string.
340 */
341 const char *found = strcasestr(check_roundtrip_encoding, enc_name);
342 const char *next;
343 int len;
344 if (!found)
345 return 0;
346 next = found + strlen(enc_name);
347 len = strlen(check_roundtrip_encoding);
348 return (found && (
349 /*
350 * check that the found encoding is at the
351 * beginning of check_roundtrip_encoding or
352 * that it is prefixed with a space or comma
353 */
354 found == check_roundtrip_encoding || (
355 (isspace(found[-1]) || found[-1] == ',')
356 )
357 ) && (
358 /*
359 * check that the found encoding is at the
360 * end of check_roundtrip_encoding or
361 * that it is suffixed with a space or comma
362 */
363 next == check_roundtrip_encoding + len || (
364 next < check_roundtrip_encoding + len &&
365 (isspace(next[0]) || next[0] == ',')
366 )
367 ));
368 }
369
370 static const char *default_encoding = "UTF-8";
371
372 static int encode_to_git(const char *path, const char *src, size_t src_len,
373 struct strbuf *buf, const char *enc, int conv_flags)
374 {
375 char *dst;
376 size_t dst_len;
377 int die_on_error = conv_flags & CONV_WRITE_OBJECT;
378
379 /*
380 * No encoding is specified or there is nothing to encode.
381 * Tell the caller that the content was not modified.
382 */
383 if (!enc || (src && !src_len))
384 return 0;
385
386 /*
387 * Looks like we got called from "would_convert_to_git()".
388 * This means Git wants to know if it would encode (= modify!)
389 * the content. Let's answer with "yes", since an encoding was
390 * specified.
391 */
392 if (!buf && !src)
393 return 1;
394
395 if (validate_encoding(path, enc, src, src_len, die_on_error))
396 return 0;
397
398 trace_encoding("source", path, enc, src, src_len);
399 dst = reencode_string_len(src, src_len, default_encoding, enc,
400 &dst_len);
401 if (!dst) {
402 /*
403 * We could add the blob "as-is" to Git. However, on checkout
404 * we would try to re-encode to the original encoding. This
405 * would fail and we would leave the user with a messed-up
406 * working tree. Let's try to avoid this by screaming loud.
407 */
408 const char* msg = _("failed to encode '%s' from %s to %s");
409 if (die_on_error)
410 die(msg, path, enc, default_encoding);
411 else {
412 error(msg, path, enc, default_encoding);
413 return 0;
414 }
415 }
416 trace_encoding("destination", path, default_encoding, dst, dst_len);
417
418 /*
419 * UTF supports lossless conversion round tripping [1] and conversions
420 * between UTF and other encodings are mostly round trip safe as
421 * Unicode aims to be a superset of all other character encodings.
422 * However, certain encodings (e.g. SHIFT-JIS) are known to have round
423 * trip issues [2]. Check the round trip conversion for all encodings
424 * listed in core.checkRoundtripEncoding.
425 *
426 * The round trip check is only performed if content is written to Git.
427 * This ensures that no information is lost during conversion to/from
428 * the internal UTF-8 representation.
429 *
430 * Please note, the code below is not tested because I was not able to
431 * generate a faulty round trip without an iconv error. Iconv errors
432 * are already caught above.
433 *
434 * [1] http://unicode.org/faq/utf_bom.html#gen2
435 * [2] https://support.microsoft.com/en-us/help/170559/prb-conversion-problem-between-shift-jis-and-unicode
436 */
437 if (die_on_error && check_roundtrip(enc)) {
438 char *re_src;
439 size_t re_src_len;
440
441 re_src = reencode_string_len(dst, dst_len,
442 enc, default_encoding,
443 &re_src_len);
444
445 trace_printf("Checking roundtrip encoding for %s...\n", enc);
446 trace_encoding("reencoded source", path, enc,
447 re_src, re_src_len);
448
449 if (!re_src || src_len != re_src_len ||
450 memcmp(src, re_src, src_len)) {
451 const char* msg = _("encoding '%s' from %s to %s and "
452 "back is not the same");
453 die(msg, path, enc, default_encoding);
454 }
455
456 free(re_src);
457 }
458
459 strbuf_attach(buf, dst, dst_len, dst_len + 1);
460 return 1;
461 }
462
463 static int encode_to_worktree(const char *path, const char *src, size_t src_len,
464 struct strbuf *buf, const char *enc)
465 {
466 char *dst;
467 size_t dst_len;
468
469 /*
470 * No encoding is specified or there is nothing to encode.
471 * Tell the caller that the content was not modified.
472 */
473 if (!enc || (src && !src_len))
474 return 0;
475
476 dst = reencode_string_len(src, src_len, enc, default_encoding,
477 &dst_len);
478 if (!dst) {
479 error(_("failed to encode '%s' from %s to %s"),
480 path, default_encoding, enc);
481 return 0;
482 }
483
484 strbuf_attach(buf, dst, dst_len, dst_len + 1);
485 return 1;
486 }
487
488 static int crlf_to_git(struct index_state *istate,
489 const char *path, const char *src, size_t len,
490 struct strbuf *buf,
491 enum convert_crlf_action crlf_action, int conv_flags)
492 {
493 struct text_stat stats;
494 char *dst;
495 int convert_crlf_into_lf;
496
497 if (crlf_action == CRLF_BINARY ||
498 (src && !len))
499 return 0;
500
501 /*
502 * If we are doing a dry-run and have no source buffer, there is
503 * nothing to analyze; we must assume we would convert.
504 */
505 if (!buf && !src)
506 return 1;
507
508 gather_stats(src, len, &stats);
509 /* Optimization: No CRLF? Nothing to convert, regardless. */
510 convert_crlf_into_lf = !!stats.crlf;
511
512 if (crlf_action == CRLF_AUTO || crlf_action == CRLF_AUTO_INPUT || crlf_action == CRLF_AUTO_CRLF) {
513 if (convert_is_binary(&stats))
514 return 0;
515 /*
516 * If the file in the index has any CR in it, do not
517 * convert. This is the new safer autocrlf handling,
518 * unless we want to renormalize in a merge or
519 * cherry-pick.
520 */
521 if ((!(conv_flags & CONV_EOL_RENORMALIZE)) &&
522 has_crlf_in_index(istate, path))
523 convert_crlf_into_lf = 0;
524 }
525 if (((conv_flags & CONV_EOL_RNDTRP_WARN) ||
526 ((conv_flags & CONV_EOL_RNDTRP_DIE) && len))) {
527 struct text_stat new_stats;
528 memcpy(&new_stats, &stats, sizeof(new_stats));
529 /* simulate "git add" */
530 if (convert_crlf_into_lf) {
531 new_stats.lonelf += new_stats.crlf;
532 new_stats.crlf = 0;
533 }
534 /* simulate "git checkout" */
535 if (will_convert_lf_to_crlf(&new_stats, crlf_action)) {
536 new_stats.crlf += new_stats.lonelf;
537 new_stats.lonelf = 0;
538 }
539 check_global_conv_flags_eol(path, &stats, &new_stats, conv_flags);
540 }
541 if (!convert_crlf_into_lf)
542 return 0;
543
544 /*
545 * At this point all of our source analysis is done, and we are sure we
546 * would convert. If we are in dry-run mode, we can give an answer.
547 */
548 if (!buf)
549 return 1;
550
551 /* only grow if not in place */
552 if (strbuf_avail(buf) + buf->len < len)
553 strbuf_grow(buf, len - buf->len);
554 dst = buf->buf;
555 if (crlf_action == CRLF_AUTO || crlf_action == CRLF_AUTO_INPUT || crlf_action == CRLF_AUTO_CRLF) {
556 /*
557 * If we guessed, we already know we rejected a file with
558 * lone CR, and we can strip a CR without looking at what
559 * follow it.
560 */
561 do {
562 unsigned char c = *src++;
563 if (c != '\r')
564 *dst++ = c;
565 } while (--len);
566 } else {
567 do {
568 unsigned char c = *src++;
569 if (! (c == '\r' && (1 < len && *src == '\n')))
570 *dst++ = c;
571 } while (--len);
572 }
573 strbuf_setlen(buf, dst - buf->buf);
574 return 1;
575 }
576
577 static int crlf_to_worktree(const char *src, size_t len, struct strbuf *buf,
578 enum convert_crlf_action crlf_action)
579 {
580 char *to_free = NULL;
581 struct text_stat stats;
582
583 if (!len || output_eol(crlf_action) != EOL_CRLF)
584 return 0;
585
586 gather_stats(src, len, &stats);
587 if (!will_convert_lf_to_crlf(&stats, crlf_action))
588 return 0;
589
590 /* are we "faking" in place editing ? */
591 if (src == buf->buf)
592 to_free = strbuf_detach(buf, NULL);
593
594 strbuf_grow(buf, len + stats.lonelf);
595 for (;;) {
596 const char *nl = memchr(src, '\n', len);
597 if (!nl)
598 break;
599 if (nl > src && nl[-1] == '\r') {
600 strbuf_add(buf, src, nl + 1 - src);
601 } else {
602 strbuf_add(buf, src, nl - src);
603 strbuf_addstr(buf, "\r\n");
604 }
605 len -= nl + 1 - src;
606 src = nl + 1;
607 }
608 strbuf_add(buf, src, len);
609
610 free(to_free);
611 return 1;
612 }
613
614 struct filter_params {
615 const char *src;
616 size_t size;
617 int fd;
618 const char *cmd;
619 const char *path;
620 };
621
622 static int filter_buffer_or_fd(int in UNUSED, int out, void *data)
623 {
624 /*
625 * Spawn cmd and feed the buffer contents through its stdin.
626 */
627 struct child_process child_process = CHILD_PROCESS_INIT;
628 struct filter_params *params = (struct filter_params *)data;
629 int write_err, status;
630
631 /* apply % substitution to cmd */
632 struct strbuf cmd = STRBUF_INIT;
633 struct strbuf path = STRBUF_INIT;
634 struct strbuf_expand_dict_entry dict[] = {
635 { "f", NULL, },
636 { NULL, NULL, },
637 };
638
639 /* quote the path to preserve spaces, etc. */
640 sq_quote_buf(&path, params->path);
641 dict[0].value = path.buf;
642
643 /* expand all %f with the quoted path */
644 strbuf_expand(&cmd, params->cmd, strbuf_expand_dict_cb, &dict);
645 strbuf_release(&path);
646
647 strvec_push(&child_process.args, cmd.buf);
648 child_process.use_shell = 1;
649 child_process.in = -1;
650 child_process.out = out;
651
652 if (start_command(&child_process)) {
653 strbuf_release(&cmd);
654 return error(_("cannot fork to run external filter '%s'"),
655 params->cmd);
656 }
657
658 sigchain_push(SIGPIPE, SIG_IGN);
659
660 if (params->src) {
661 write_err = (write_in_full(child_process.in,
662 params->src, params->size) < 0);
663 if (errno == EPIPE)
664 write_err = 0;
665 } else {
666 write_err = copy_fd(params->fd, child_process.in);
667 if (write_err == COPY_WRITE_ERROR && errno == EPIPE)
668 write_err = 0;
669 }
670
671 if (close(child_process.in))
672 write_err = 1;
673 if (write_err)
674 error(_("cannot feed the input to external filter '%s'"),
675 params->cmd);
676
677 sigchain_pop(SIGPIPE);
678
679 status = finish_command(&child_process);
680 if (status)
681 error(_("external filter '%s' failed %d"), params->cmd, status);
682
683 strbuf_release(&cmd);
684 return (write_err || status);
685 }
686
687 static int apply_single_file_filter(const char *path, const char *src, size_t len, int fd,
688 struct strbuf *dst, const char *cmd)
689 {
690 /*
691 * Create a pipeline to have the command filter the buffer's
692 * contents.
693 *
694 * (child --> cmd) --> us
695 */
696 int err = 0;
697 struct strbuf nbuf = STRBUF_INIT;
698 struct async async;
699 struct filter_params params;
700
701 memset(&async, 0, sizeof(async));
702 async.proc = filter_buffer_or_fd;
703 async.data = &params;
704 async.out = -1;
705 params.src = src;
706 params.size = len;
707 params.fd = fd;
708 params.cmd = cmd;
709 params.path = path;
710
711 fflush(NULL);
712 if (start_async(&async))
713 return 0; /* error was already reported */
714
715 if (strbuf_read(&nbuf, async.out, 0) < 0) {
716 err = error(_("read from external filter '%s' failed"), cmd);
717 }
718 if (close(async.out)) {
719 err = error(_("read from external filter '%s' failed"), cmd);
720 }
721 if (finish_async(&async)) {
722 err = error(_("external filter '%s' failed"), cmd);
723 }
724
725 if (!err) {
726 strbuf_swap(dst, &nbuf);
727 }
728 strbuf_release(&nbuf);
729 return !err;
730 }
731
732 #define CAP_CLEAN (1u<<0)
733 #define CAP_SMUDGE (1u<<1)
734 #define CAP_DELAY (1u<<2)
735
736 struct cmd2process {
737 struct subprocess_entry subprocess; /* must be the first member! */
738 unsigned int supported_capabilities;
739 };
740
741 static int subprocess_map_initialized;
742 static struct hashmap subprocess_map;
743
744 static int start_multi_file_filter_fn(struct subprocess_entry *subprocess)
745 {
746 static int versions[] = {2, 0};
747 static struct subprocess_capability capabilities[] = {
748 { "clean", CAP_CLEAN },
749 { "smudge", CAP_SMUDGE },
750 { "delay", CAP_DELAY },
751 { NULL, 0 }
752 };
753 struct cmd2process *entry = (struct cmd2process *)subprocess;
754 return subprocess_handshake(subprocess, "git-filter", versions, NULL,
755 capabilities,
756 &entry->supported_capabilities);
757 }
758
759 static void handle_filter_error(const struct strbuf *filter_status,
760 struct cmd2process *entry,
761 const unsigned int wanted_capability)
762 {
763 if (!strcmp(filter_status->buf, "error"))
764 ; /* The filter signaled a problem with the file. */
765 else if (!strcmp(filter_status->buf, "abort") && wanted_capability) {
766 /*
767 * The filter signaled a permanent problem. Don't try to filter
768 * files with the same command for the lifetime of the current
769 * Git process.
770 */
771 entry->supported_capabilities &= ~wanted_capability;
772 } else {
773 /*
774 * Something went wrong with the protocol filter.
775 * Force shutdown and restart if another blob requires filtering.
776 */
777 error(_("external filter '%s' failed"), entry->subprocess.cmd);
778 subprocess_stop(&subprocess_map, &entry->subprocess);
779 free(entry);
780 }
781 }
782
783 static int apply_multi_file_filter(const char *path, const char *src, size_t len,
784 int fd, struct strbuf *dst, const char *cmd,
785 const unsigned int wanted_capability,
786 const struct checkout_metadata *meta,
787 struct delayed_checkout *dco)
788 {
789 int err;
790 int can_delay = 0;
791 struct cmd2process *entry;
792 struct child_process *process;
793 struct strbuf nbuf = STRBUF_INIT;
794 struct strbuf filter_status = STRBUF_INIT;
795 const char *filter_type;
796
797 if (!subprocess_map_initialized) {
798 subprocess_map_initialized = 1;
799 hashmap_init(&subprocess_map, cmd2process_cmp, NULL, 0);
800 entry = NULL;
801 } else {
802 entry = (struct cmd2process *)subprocess_find_entry(&subprocess_map, cmd);
803 }
804
805 fflush(NULL);
806
807 if (!entry) {
808 entry = xmalloc(sizeof(*entry));
809 entry->supported_capabilities = 0;
810
811 if (subprocess_start(&subprocess_map, &entry->subprocess, cmd, start_multi_file_filter_fn)) {
812 free(entry);
813 return 0;
814 }
815 }
816 process = &entry->subprocess.process;
817
818 if (!(entry->supported_capabilities & wanted_capability))
819 return 0;
820
821 if (wanted_capability & CAP_CLEAN)
822 filter_type = "clean";
823 else if (wanted_capability & CAP_SMUDGE)
824 filter_type = "smudge";
825 else
826 die(_("unexpected filter type"));
827
828 sigchain_push(SIGPIPE, SIG_IGN);
829
830 assert(strlen(filter_type) < LARGE_PACKET_DATA_MAX - strlen("command=\n"));
831 err = packet_write_fmt_gently(process->in, "command=%s\n", filter_type);
832 if (err)
833 goto done;
834
835 err = strlen(path) > LARGE_PACKET_DATA_MAX - strlen("pathname=\n");
836 if (err) {
837 error(_("path name too long for external filter"));
838 goto done;
839 }
840
841 err = packet_write_fmt_gently(process->in, "pathname=%s\n", path);
842 if (err)
843 goto done;
844
845 if (meta && meta->refname) {
846 err = packet_write_fmt_gently(process->in, "ref=%s\n", meta->refname);
847 if (err)
848 goto done;
849 }
850
851 if (meta && !is_null_oid(&meta->treeish)) {
852 err = packet_write_fmt_gently(process->in, "treeish=%s\n", oid_to_hex(&meta->treeish));
853 if (err)
854 goto done;
855 }
856
857 if (meta && !is_null_oid(&meta->blob)) {
858 err = packet_write_fmt_gently(process->in, "blob=%s\n", oid_to_hex(&meta->blob));
859 if (err)
860 goto done;
861 }
862
863 if ((entry->supported_capabilities & CAP_DELAY) &&
864 dco && dco->state == CE_CAN_DELAY) {
865 can_delay = 1;
866 err = packet_write_fmt_gently(process->in, "can-delay=1\n");
867 if (err)
868 goto done;
869 }
870
871 err = packet_flush_gently(process->in);
872 if (err)
873 goto done;
874
875 if (fd >= 0)
876 err = write_packetized_from_fd_no_flush(fd, process->in);
877 else
878 err = write_packetized_from_buf_no_flush(src, len, process->in);
879 if (err)
880 goto done;
881
882 err = packet_flush_gently(process->in);
883 if (err)
884 goto done;
885
886 err = subprocess_read_status(process->out, &filter_status);
887 if (err)
888 goto done;
889
890 if (can_delay && !strcmp(filter_status.buf, "delayed")) {
891 string_list_insert(&dco->filters, cmd);
892 string_list_insert(&dco->paths, path);
893 } else {
894 /* The filter got the blob and wants to send us a response. */
895 err = strcmp(filter_status.buf, "success");
896 if (err)
897 goto done;
898
899 err = read_packetized_to_strbuf(process->out, &nbuf,
900 PACKET_READ_GENTLE_ON_EOF) < 0;
901 if (err)
902 goto done;
903
904 err = subprocess_read_status(process->out, &filter_status);
905 if (err)
906 goto done;
907
908 err = strcmp(filter_status.buf, "success");
909 }
910
911 done:
912 sigchain_pop(SIGPIPE);
913
914 if (err)
915 handle_filter_error(&filter_status, entry, wanted_capability);
916 else
917 strbuf_swap(dst, &nbuf);
918 strbuf_release(&nbuf);
919 strbuf_release(&filter_status);
920 return !err;
921 }
922
923
924 int async_query_available_blobs(const char *cmd, struct string_list *available_paths)
925 {
926 int err;
927 char *line;
928 struct cmd2process *entry;
929 struct child_process *process;
930 struct strbuf filter_status = STRBUF_INIT;
931
932 assert(subprocess_map_initialized);
933 entry = (struct cmd2process *)subprocess_find_entry(&subprocess_map, cmd);
934 if (!entry) {
935 error(_("external filter '%s' is not available anymore although "
936 "not all paths have been filtered"), cmd);
937 return 0;
938 }
939 process = &entry->subprocess.process;
940 sigchain_push(SIGPIPE, SIG_IGN);
941
942 err = packet_write_fmt_gently(
943 process->in, "command=list_available_blobs\n");
944 if (err)
945 goto done;
946
947 err = packet_flush_gently(process->in);
948 if (err)
949 goto done;
950
951 while ((line = packet_read_line(process->out, NULL))) {
952 const char *path;
953 if (skip_prefix(line, "pathname=", &path))
954 string_list_insert(available_paths, xstrdup(path));
955 else
956 ; /* ignore unknown keys */
957 }
958
959 err = subprocess_read_status(process->out, &filter_status);
960 if (err)
961 goto done;
962
963 err = strcmp(filter_status.buf, "success");
964
965 done:
966 sigchain_pop(SIGPIPE);
967
968 if (err)
969 handle_filter_error(&filter_status, entry, 0);
970 strbuf_release(&filter_status);
971 return !err;
972 }
973
974 static struct convert_driver {
975 const char *name;
976 struct convert_driver *next;
977 const char *smudge;
978 const char *clean;
979 const char *process;
980 int required;
981 } *user_convert, **user_convert_tail;
982
983 static int apply_filter(const char *path, const char *src, size_t len,
984 int fd, struct strbuf *dst, struct convert_driver *drv,
985 const unsigned int wanted_capability,
986 const struct checkout_metadata *meta,
987 struct delayed_checkout *dco)
988 {
989 const char *cmd = NULL;
990
991 if (!drv)
992 return 0;
993
994 if (!dst)
995 return 1;
996
997 if ((wanted_capability & CAP_CLEAN) && !drv->process && drv->clean)
998 cmd = drv->clean;
999 else if ((wanted_capability & CAP_SMUDGE) && !drv->process && drv->smudge)
1000 cmd = drv->smudge;
1001
1002 if (cmd && *cmd)
1003 return apply_single_file_filter(path, src, len, fd, dst, cmd);
1004 else if (drv->process && *drv->process)
1005 return apply_multi_file_filter(path, src, len, fd, dst,
1006 drv->process, wanted_capability, meta, dco);
1007
1008 return 0;
1009 }
1010
1011 static int read_convert_config(const char *var, const char *value, void *cb UNUSED)
1012 {
1013 const char *key, *name;
1014 size_t namelen;
1015 struct convert_driver *drv;
1016
1017 /*
1018 * External conversion drivers are configured using
1019 * "filter.<name>.variable".
1020 */
1021 if (parse_config_key(var, "filter", &name, &namelen, &key) < 0 || !name)
1022 return 0;
1023 for (drv = user_convert; drv; drv = drv->next)
1024 if (!strncmp(drv->name, name, namelen) && !drv->name[namelen])
1025 break;
1026 if (!drv) {
1027 CALLOC_ARRAY(drv, 1);
1028 drv->name = xmemdupz(name, namelen);
1029 *user_convert_tail = drv;
1030 user_convert_tail = &(drv->next);
1031 }
1032
1033 /*
1034 * filter.<name>.smudge and filter.<name>.clean specifies
1035 * the command line:
1036 *
1037 * command-line
1038 *
1039 * The command-line will not be interpolated in any way.
1040 */
1041
1042 if (!strcmp("smudge", key))
1043 return git_config_string(&drv->smudge, var, value);
1044
1045 if (!strcmp("clean", key))
1046 return git_config_string(&drv->clean, var, value);
1047
1048 if (!strcmp("process", key))
1049 return git_config_string(&drv->process, var, value);
1050
1051 if (!strcmp("required", key)) {
1052 drv->required = git_config_bool(var, value);
1053 return 0;
1054 }
1055
1056 return 0;
1057 }
1058
1059 static int count_ident(const char *cp, unsigned long size)
1060 {
1061 /*
1062 * "$Id: 0000000000000000000000000000000000000000 $" <=> "$Id$"
1063 */
1064 int cnt = 0;
1065 char ch;
1066
1067 while (size) {
1068 ch = *cp++;
1069 size--;
1070 if (ch != '$')
1071 continue;
1072 if (size < 3)
1073 break;
1074 if (memcmp("Id", cp, 2))
1075 continue;
1076 ch = cp[2];
1077 cp += 3;
1078 size -= 3;
1079 if (ch == '$')
1080 cnt++; /* $Id$ */
1081 if (ch != ':')
1082 continue;
1083
1084 /*
1085 * "$Id: ... "; scan up to the closing dollar sign and discard.
1086 */
1087 while (size) {
1088 ch = *cp++;
1089 size--;
1090 if (ch == '$') {
1091 cnt++;
1092 break;
1093 }
1094 if (ch == '\n')
1095 break;
1096 }
1097 }
1098 return cnt;
1099 }
1100
1101 static int ident_to_git(const char *src, size_t len,
1102 struct strbuf *buf, int ident)
1103 {
1104 char *dst, *dollar;
1105
1106 if (!ident || (src && !count_ident(src, len)))
1107 return 0;
1108
1109 if (!buf)
1110 return 1;
1111
1112 /* only grow if not in place */
1113 if (strbuf_avail(buf) + buf->len < len)
1114 strbuf_grow(buf, len - buf->len);
1115 dst = buf->buf;
1116 for (;;) {
1117 dollar = memchr(src, '$', len);
1118 if (!dollar)
1119 break;
1120 memmove(dst, src, dollar + 1 - src);
1121 dst += dollar + 1 - src;
1122 len -= dollar + 1 - src;
1123 src = dollar + 1;
1124
1125 if (len > 3 && !memcmp(src, "Id:", 3)) {
1126 dollar = memchr(src + 3, '$', len - 3);
1127 if (!dollar)
1128 break;
1129 if (memchr(src + 3, '\n', dollar - src - 3)) {
1130 /* Line break before the next dollar. */
1131 continue;
1132 }
1133
1134 memcpy(dst, "Id$", 3);
1135 dst += 3;
1136 len -= dollar + 1 - src;
1137 src = dollar + 1;
1138 }
1139 }
1140 memmove(dst, src, len);
1141 strbuf_setlen(buf, dst + len - buf->buf);
1142 return 1;
1143 }
1144
1145 static int ident_to_worktree(const char *src, size_t len,
1146 struct strbuf *buf, int ident)
1147 {
1148 struct object_id oid;
1149 char *to_free = NULL, *dollar, *spc;
1150 int cnt;
1151
1152 if (!ident)
1153 return 0;
1154
1155 cnt = count_ident(src, len);
1156 if (!cnt)
1157 return 0;
1158
1159 /* are we "faking" in place editing ? */
1160 if (src == buf->buf)
1161 to_free = strbuf_detach(buf, NULL);
1162 hash_object_file(the_hash_algo, src, len, OBJ_BLOB, &oid);
1163
1164 strbuf_grow(buf, len + cnt * (the_hash_algo->hexsz + 3));
1165 for (;;) {
1166 /* step 1: run to the next '$' */
1167 dollar = memchr(src, '$', len);
1168 if (!dollar)
1169 break;
1170 strbuf_add(buf, src, dollar + 1 - src);
1171 len -= dollar + 1 - src;
1172 src = dollar + 1;
1173
1174 /* step 2: does it looks like a bit like Id:xxx$ or Id$ ? */
1175 if (len < 3 || memcmp("Id", src, 2))
1176 continue;
1177
1178 /* step 3: skip over Id$ or Id:xxxxx$ */
1179 if (src[2] == '$') {
1180 src += 3;
1181 len -= 3;
1182 } else if (src[2] == ':') {
1183 /*
1184 * It's possible that an expanded Id has crept its way into the
1185 * repository, we cope with that by stripping the expansion out.
1186 * This is probably not a good idea, since it will cause changes
1187 * on checkout, which won't go away by stash, but let's keep it
1188 * for git-style ids.
1189 */
1190 dollar = memchr(src + 3, '$', len - 3);
1191 if (!dollar) {
1192 /* incomplete keyword, no more '$', so just quit the loop */
1193 break;
1194 }
1195
1196 if (memchr(src + 3, '\n', dollar - src - 3)) {
1197 /* Line break before the next dollar. */
1198 continue;
1199 }
1200
1201 spc = memchr(src + 4, ' ', dollar - src - 4);
1202 if (spc && spc < dollar-1) {
1203 /* There are spaces in unexpected places.
1204 * This is probably an id from some other
1205 * versioning system. Keep it for now.
1206 */
1207 continue;
1208 }
1209
1210 len -= dollar + 1 - src;
1211 src = dollar + 1;
1212 } else {
1213 /* it wasn't a "Id$" or "Id:xxxx$" */
1214 continue;
1215 }
1216
1217 /* step 4: substitute */
1218 strbuf_addstr(buf, "Id: ");
1219 strbuf_addstr(buf, oid_to_hex(&oid));
1220 strbuf_addstr(buf, " $");
1221 }
1222 strbuf_add(buf, src, len);
1223
1224 free(to_free);
1225 return 1;
1226 }
1227
1228 static const char *git_path_check_encoding(struct attr_check_item *check)
1229 {
1230 const char *value = check->value;
1231
1232 if (ATTR_UNSET(value) || !strlen(value))
1233 return NULL;
1234
1235 if (ATTR_TRUE(value) || ATTR_FALSE(value)) {
1236 die(_("true/false are no valid working-tree-encodings"));
1237 }
1238
1239 /* Don't encode to the default encoding */
1240 if (same_encoding(value, default_encoding))
1241 return NULL;
1242
1243 return value;
1244 }
1245
1246 static enum convert_crlf_action git_path_check_crlf(struct attr_check_item *check)
1247 {
1248 const char *value = check->value;
1249
1250 if (ATTR_TRUE(value))
1251 return CRLF_TEXT;
1252 else if (ATTR_FALSE(value))
1253 return CRLF_BINARY;
1254 else if (ATTR_UNSET(value))
1255 ;
1256 else if (!strcmp(value, "input"))
1257 return CRLF_TEXT_INPUT;
1258 else if (!strcmp(value, "auto"))
1259 return CRLF_AUTO;
1260 return CRLF_UNDEFINED;
1261 }
1262
1263 static enum eol git_path_check_eol(struct attr_check_item *check)
1264 {
1265 const char *value = check->value;
1266
1267 if (ATTR_UNSET(value))
1268 ;
1269 else if (!strcmp(value, "lf"))
1270 return EOL_LF;
1271 else if (!strcmp(value, "crlf"))
1272 return EOL_CRLF;
1273 return EOL_UNSET;
1274 }
1275
1276 static struct convert_driver *git_path_check_convert(struct attr_check_item *check)
1277 {
1278 const char *value = check->value;
1279 struct convert_driver *drv;
1280
1281 if (ATTR_TRUE(value) || ATTR_FALSE(value) || ATTR_UNSET(value))
1282 return NULL;
1283 for (drv = user_convert; drv; drv = drv->next)
1284 if (!strcmp(value, drv->name))
1285 return drv;
1286 return NULL;
1287 }
1288
1289 static int git_path_check_ident(struct attr_check_item *check)
1290 {
1291 const char *value = check->value;
1292
1293 return !!ATTR_TRUE(value);
1294 }
1295
1296 static struct attr_check *check;
1297
1298 void convert_attrs(struct index_state *istate,
1299 struct conv_attrs *ca, const char *path)
1300 {
1301 struct attr_check_item *ccheck = NULL;
1302
1303 if (!check) {
1304 check = attr_check_initl("crlf", "ident", "filter",
1305 "eol", "text", "working-tree-encoding",
1306 NULL);
1307 user_convert_tail = &user_convert;
1308 git_config(read_convert_config, NULL);
1309 }
1310
1311 git_check_attr(istate, NULL, path, check);
1312 ccheck = check->items;
1313 ca->crlf_action = git_path_check_crlf(ccheck + 4);
1314 if (ca->crlf_action == CRLF_UNDEFINED)
1315 ca->crlf_action = git_path_check_crlf(ccheck + 0);
1316 ca->ident = git_path_check_ident(ccheck + 1);
1317 ca->drv = git_path_check_convert(ccheck + 2);
1318 if (ca->crlf_action != CRLF_BINARY) {
1319 enum eol eol_attr = git_path_check_eol(ccheck + 3);
1320 if (ca->crlf_action == CRLF_AUTO && eol_attr == EOL_LF)
1321 ca->crlf_action = CRLF_AUTO_INPUT;
1322 else if (ca->crlf_action == CRLF_AUTO && eol_attr == EOL_CRLF)
1323 ca->crlf_action = CRLF_AUTO_CRLF;
1324 else if (eol_attr == EOL_LF)
1325 ca->crlf_action = CRLF_TEXT_INPUT;
1326 else if (eol_attr == EOL_CRLF)
1327 ca->crlf_action = CRLF_TEXT_CRLF;
1328 }
1329 ca->working_tree_encoding = git_path_check_encoding(ccheck + 5);
1330
1331 /* Save attr and make a decision for action */
1332 ca->attr_action = ca->crlf_action;
1333 if (ca->crlf_action == CRLF_TEXT)
1334 ca->crlf_action = text_eol_is_crlf() ? CRLF_TEXT_CRLF : CRLF_TEXT_INPUT;
1335 if (ca->crlf_action == CRLF_UNDEFINED && auto_crlf == AUTO_CRLF_FALSE)
1336 ca->crlf_action = CRLF_BINARY;
1337 if (ca->crlf_action == CRLF_UNDEFINED && auto_crlf == AUTO_CRLF_TRUE)
1338 ca->crlf_action = CRLF_AUTO_CRLF;
1339 if (ca->crlf_action == CRLF_UNDEFINED && auto_crlf == AUTO_CRLF_INPUT)
1340 ca->crlf_action = CRLF_AUTO_INPUT;
1341 }
1342
1343 void reset_parsed_attributes(void)
1344 {
1345 struct convert_driver *drv, *next;
1346
1347 attr_check_free(check);
1348 check = NULL;
1349 reset_merge_attributes();
1350
1351 for (drv = user_convert; drv; drv = next) {
1352 next = drv->next;
1353 free((void *)drv->name);
1354 free(drv);
1355 }
1356 user_convert = NULL;
1357 user_convert_tail = NULL;
1358 }
1359
1360 int would_convert_to_git_filter_fd(struct index_state *istate, const char *path)
1361 {
1362 struct conv_attrs ca;
1363
1364 convert_attrs(istate, &ca, path);
1365 if (!ca.drv)
1366 return 0;
1367
1368 /*
1369 * Apply a filter to an fd only if the filter is required to succeed.
1370 * We must die if the filter fails, because the original data before
1371 * filtering is not available.
1372 */
1373 if (!ca.drv->required)
1374 return 0;
1375
1376 return apply_filter(path, NULL, 0, -1, NULL, ca.drv, CAP_CLEAN, NULL, NULL);
1377 }
1378
1379 const char *get_convert_attr_ascii(struct index_state *istate, const char *path)
1380 {
1381 struct conv_attrs ca;
1382
1383 convert_attrs(istate, &ca, path);
1384 switch (ca.attr_action) {
1385 case CRLF_UNDEFINED:
1386 return "";
1387 case CRLF_BINARY:
1388 return "-text";
1389 case CRLF_TEXT:
1390 return "text";
1391 case CRLF_TEXT_INPUT:
1392 return "text eol=lf";
1393 case CRLF_TEXT_CRLF:
1394 return "text eol=crlf";
1395 case CRLF_AUTO:
1396 return "text=auto";
1397 case CRLF_AUTO_CRLF:
1398 return "text=auto eol=crlf";
1399 case CRLF_AUTO_INPUT:
1400 return "text=auto eol=lf";
1401 }
1402 return "";
1403 }
1404
1405 int convert_to_git(struct index_state *istate,
1406 const char *path, const char *src, size_t len,
1407 struct strbuf *dst, int conv_flags)
1408 {
1409 int ret = 0;
1410 struct conv_attrs ca;
1411
1412 convert_attrs(istate, &ca, path);
1413
1414 ret |= apply_filter(path, src, len, -1, dst, ca.drv, CAP_CLEAN, NULL, NULL);
1415 if (!ret && ca.drv && ca.drv->required)
1416 die(_("%s: clean filter '%s' failed"), path, ca.drv->name);
1417
1418 if (ret && dst) {
1419 src = dst->buf;
1420 len = dst->len;
1421 }
1422
1423 ret |= encode_to_git(path, src, len, dst, ca.working_tree_encoding, conv_flags);
1424 if (ret && dst) {
1425 src = dst->buf;
1426 len = dst->len;
1427 }
1428
1429 if (!(conv_flags & CONV_EOL_KEEP_CRLF)) {
1430 ret |= crlf_to_git(istate, path, src, len, dst, ca.crlf_action, conv_flags);
1431 if (ret && dst) {
1432 src = dst->buf;
1433 len = dst->len;
1434 }
1435 }
1436 return ret | ident_to_git(src, len, dst, ca.ident);
1437 }
1438
1439 void convert_to_git_filter_fd(struct index_state *istate,
1440 const char *path, int fd, struct strbuf *dst,
1441 int conv_flags)
1442 {
1443 struct conv_attrs ca;
1444 convert_attrs(istate, &ca, path);
1445
1446 assert(ca.drv);
1447
1448 if (!apply_filter(path, NULL, 0, fd, dst, ca.drv, CAP_CLEAN, NULL, NULL))
1449 die(_("%s: clean filter '%s' failed"), path, ca.drv->name);
1450
1451 encode_to_git(path, dst->buf, dst->len, dst, ca.working_tree_encoding, conv_flags);
1452 crlf_to_git(istate, path, dst->buf, dst->len, dst, ca.crlf_action, conv_flags);
1453 ident_to_git(dst->buf, dst->len, dst, ca.ident);
1454 }
1455
1456 static int convert_to_working_tree_ca_internal(const struct conv_attrs *ca,
1457 const char *path, const char *src,
1458 size_t len, struct strbuf *dst,
1459 int normalizing,
1460 const struct checkout_metadata *meta,
1461 struct delayed_checkout *dco)
1462 {
1463 int ret = 0, ret_filter = 0;
1464
1465 ret |= ident_to_worktree(src, len, dst, ca->ident);
1466 if (ret) {
1467 src = dst->buf;
1468 len = dst->len;
1469 }
1470 /*
1471 * CRLF conversion can be skipped if normalizing, unless there
1472 * is a smudge or process filter (even if the process filter doesn't
1473 * support smudge). The filters might expect CRLFs.
1474 */
1475 if ((ca->drv && (ca->drv->smudge || ca->drv->process)) || !normalizing) {
1476 ret |= crlf_to_worktree(src, len, dst, ca->crlf_action);
1477 if (ret) {
1478 src = dst->buf;
1479 len = dst->len;
1480 }
1481 }
1482
1483 ret |= encode_to_worktree(path, src, len, dst, ca->working_tree_encoding);
1484 if (ret) {
1485 src = dst->buf;
1486 len = dst->len;
1487 }
1488
1489 ret_filter = apply_filter(
1490 path, src, len, -1, dst, ca->drv, CAP_SMUDGE, meta, dco);
1491 if (!ret_filter && ca->drv && ca->drv->required)
1492 die(_("%s: smudge filter %s failed"), path, ca->drv->name);
1493
1494 return ret | ret_filter;
1495 }
1496
1497 int async_convert_to_working_tree_ca(const struct conv_attrs *ca,
1498 const char *path, const char *src,
1499 size_t len, struct strbuf *dst,
1500 const struct checkout_metadata *meta,
1501 void *dco)
1502 {
1503 return convert_to_working_tree_ca_internal(ca, path, src, len, dst, 0,
1504 meta, dco);
1505 }
1506
1507 int convert_to_working_tree_ca(const struct conv_attrs *ca,
1508 const char *path, const char *src,
1509 size_t len, struct strbuf *dst,
1510 const struct checkout_metadata *meta)
1511 {
1512 return convert_to_working_tree_ca_internal(ca, path, src, len, dst, 0,
1513 meta, NULL);
1514 }
1515
1516 int renormalize_buffer(struct index_state *istate, const char *path,
1517 const char *src, size_t len, struct strbuf *dst)
1518 {
1519 struct conv_attrs ca;
1520 int ret;
1521
1522 convert_attrs(istate, &ca, path);
1523 ret = convert_to_working_tree_ca_internal(&ca, path, src, len, dst, 1,
1524 NULL, NULL);
1525 if (ret) {
1526 src = dst->buf;
1527 len = dst->len;
1528 }
1529 return ret | convert_to_git(istate, path, src, len, dst, CONV_EOL_RENORMALIZE);
1530 }
1531
1532 /*****************************************************************
1533 *
1534 * Streaming conversion support
1535 *
1536 *****************************************************************/
1537
1538 typedef int (*filter_fn)(struct stream_filter *,
1539 const char *input, size_t *isize_p,
1540 char *output, size_t *osize_p);
1541 typedef void (*free_fn)(struct stream_filter *);
1542
1543 struct stream_filter_vtbl {
1544 filter_fn filter;
1545 free_fn free;
1546 };
1547
1548 struct stream_filter {
1549 struct stream_filter_vtbl *vtbl;
1550 };
1551
1552 static int null_filter_fn(struct stream_filter *filter UNUSED,
1553 const char *input, size_t *isize_p,
1554 char *output, size_t *osize_p)
1555 {
1556 size_t count;
1557
1558 if (!input)
1559 return 0; /* we do not keep any states */
1560 count = *isize_p;
1561 if (*osize_p < count)
1562 count = *osize_p;
1563 if (count) {
1564 memmove(output, input, count);
1565 *isize_p -= count;
1566 *osize_p -= count;
1567 }
1568 return 0;
1569 }
1570
1571 static void null_free_fn(struct stream_filter *filter UNUSED)
1572 {
1573 ; /* nothing -- null instances are shared */
1574 }
1575
1576 static struct stream_filter_vtbl null_vtbl = {
1577 .filter = null_filter_fn,
1578 .free = null_free_fn,
1579 };
1580
1581 static struct stream_filter null_filter_singleton = {
1582 .vtbl = &null_vtbl,
1583 };
1584
1585 int is_null_stream_filter(struct stream_filter *filter)
1586 {
1587 return filter == &null_filter_singleton;
1588 }
1589
1590
1591 /*
1592 * LF-to-CRLF filter
1593 */
1594
1595 struct lf_to_crlf_filter {
1596 struct stream_filter filter;
1597 unsigned has_held:1;
1598 char held;
1599 };
1600
1601 static int lf_to_crlf_filter_fn(struct stream_filter *filter,
1602 const char *input, size_t *isize_p,
1603 char *output, size_t *osize_p)
1604 {
1605 size_t count, o = 0;
1606 struct lf_to_crlf_filter *lf_to_crlf = (struct lf_to_crlf_filter *)filter;
1607
1608 /*
1609 * We may be holding onto the CR to see if it is followed by a
1610 * LF, in which case we would need to go to the main loop.
1611 * Otherwise, just emit it to the output stream.
1612 */
1613 if (lf_to_crlf->has_held && (lf_to_crlf->held != '\r' || !input)) {
1614 output[o++] = lf_to_crlf->held;
1615 lf_to_crlf->has_held = 0;
1616 }
1617
1618 /* We are told to drain */
1619 if (!input) {
1620 *osize_p -= o;
1621 return 0;
1622 }
1623
1624 count = *isize_p;
1625 if (count || lf_to_crlf->has_held) {
1626 size_t i;
1627 int was_cr = 0;
1628
1629 if (lf_to_crlf->has_held) {
1630 was_cr = 1;
1631 lf_to_crlf->has_held = 0;
1632 }
1633
1634 for (i = 0; o < *osize_p && i < count; i++) {
1635 char ch = input[i];
1636
1637 if (ch == '\n') {
1638 output[o++] = '\r';
1639 } else if (was_cr) {
1640 /*
1641 * Previous round saw CR and it is not followed
1642 * by a LF; emit the CR before processing the
1643 * current character.
1644 */
1645 output[o++] = '\r';
1646 }
1647
1648 /*
1649 * We may have consumed the last output slot,
1650 * in which case we need to break out of this
1651 * loop; hold the current character before
1652 * returning.
1653 */
1654 if (*osize_p <= o) {
1655 lf_to_crlf->has_held = 1;
1656 lf_to_crlf->held = ch;
1657 continue; /* break but increment i */
1658 }
1659
1660 if (ch == '\r') {
1661 was_cr = 1;
1662 continue;
1663 }
1664
1665 was_cr = 0;
1666 output[o++] = ch;
1667 }
1668
1669 *osize_p -= o;
1670 *isize_p -= i;
1671
1672 if (!lf_to_crlf->has_held && was_cr) {
1673 lf_to_crlf->has_held = 1;
1674 lf_to_crlf->held = '\r';
1675 }
1676 }
1677 return 0;
1678 }
1679
1680 static void lf_to_crlf_free_fn(struct stream_filter *filter)
1681 {
1682 free(filter);
1683 }
1684
1685 static struct stream_filter_vtbl lf_to_crlf_vtbl = {
1686 .filter = lf_to_crlf_filter_fn,
1687 .free = lf_to_crlf_free_fn,
1688 };
1689
1690 static struct stream_filter *lf_to_crlf_filter(void)
1691 {
1692 struct lf_to_crlf_filter *lf_to_crlf = xcalloc(1, sizeof(*lf_to_crlf));
1693
1694 lf_to_crlf->filter.vtbl = &lf_to_crlf_vtbl;
1695 return (struct stream_filter *)lf_to_crlf;
1696 }
1697
1698 /*
1699 * Cascade filter
1700 */
1701 #define FILTER_BUFFER 1024
1702 struct cascade_filter {
1703 struct stream_filter filter;
1704 struct stream_filter *one;
1705 struct stream_filter *two;
1706 char buf[FILTER_BUFFER];
1707 int end, ptr;
1708 };
1709
1710 static int cascade_filter_fn(struct stream_filter *filter,
1711 const char *input, size_t *isize_p,
1712 char *output, size_t *osize_p)
1713 {
1714 struct cascade_filter *cas = (struct cascade_filter *) filter;
1715 size_t filled = 0;
1716 size_t sz = *osize_p;
1717 size_t to_feed, remaining;
1718
1719 /*
1720 * input -- (one) --> buf -- (two) --> output
1721 */
1722 while (filled < sz) {
1723 remaining = sz - filled;
1724
1725 /* do we already have something to feed two with? */
1726 if (cas->ptr < cas->end) {
1727 to_feed = cas->end - cas->ptr;
1728 if (stream_filter(cas->two,
1729 cas->buf + cas->ptr, &to_feed,
1730 output + filled, &remaining))
1731 return -1;
1732 cas->ptr += (cas->end - cas->ptr) - to_feed;
1733 filled = sz - remaining;
1734 continue;
1735 }
1736
1737 /* feed one from upstream and have it emit into our buffer */
1738 to_feed = input ? *isize_p : 0;
1739 if (input && !to_feed)
1740 break;
1741 remaining = sizeof(cas->buf);
1742 if (stream_filter(cas->one,
1743 input, &to_feed,
1744 cas->buf, &remaining))
1745 return -1;
1746 cas->end = sizeof(cas->buf) - remaining;
1747 cas->ptr = 0;
1748 if (input) {
1749 size_t fed = *isize_p - to_feed;
1750 *isize_p -= fed;
1751 input += fed;
1752 }
1753
1754 /* do we know that we drained one completely? */
1755 if (input || cas->end)
1756 continue;
1757
1758 /* tell two to drain; we have nothing more to give it */
1759 to_feed = 0;
1760 remaining = sz - filled;
1761 if (stream_filter(cas->two,
1762 NULL, &to_feed,
1763 output + filled, &remaining))
1764 return -1;
1765 if (remaining == (sz - filled))
1766 break; /* completely drained two */
1767 filled = sz - remaining;
1768 }
1769 *osize_p -= filled;
1770 return 0;
1771 }
1772
1773 static void cascade_free_fn(struct stream_filter *filter)
1774 {
1775 struct cascade_filter *cas = (struct cascade_filter *)filter;
1776 free_stream_filter(cas->one);
1777 free_stream_filter(cas->two);
1778 free(filter);
1779 }
1780
1781 static struct stream_filter_vtbl cascade_vtbl = {
1782 .filter = cascade_filter_fn,
1783 .free = cascade_free_fn,
1784 };
1785
1786 static struct stream_filter *cascade_filter(struct stream_filter *one,
1787 struct stream_filter *two)
1788 {
1789 struct cascade_filter *cascade;
1790
1791 if (!one || is_null_stream_filter(one))
1792 return two;
1793 if (!two || is_null_stream_filter(two))
1794 return one;
1795
1796 cascade = xmalloc(sizeof(*cascade));
1797 cascade->one = one;
1798 cascade->two = two;
1799 cascade->end = cascade->ptr = 0;
1800 cascade->filter.vtbl = &cascade_vtbl;
1801 return (struct stream_filter *)cascade;
1802 }
1803
1804 /*
1805 * ident filter
1806 */
1807 #define IDENT_DRAINING (-1)
1808 #define IDENT_SKIPPING (-2)
1809 struct ident_filter {
1810 struct stream_filter filter;
1811 struct strbuf left;
1812 int state;
1813 char ident[GIT_MAX_HEXSZ + 5]; /* ": x40 $" */
1814 };
1815
1816 static int is_foreign_ident(const char *str)
1817 {
1818 int i;
1819
1820 if (!skip_prefix(str, "$Id: ", &str))
1821 return 0;
1822 for (i = 0; str[i]; i++) {
1823 if (isspace(str[i]) && str[i+1] != '$')
1824 return 1;
1825 }
1826 return 0;
1827 }
1828
1829 static void ident_drain(struct ident_filter *ident, char **output_p, size_t *osize_p)
1830 {
1831 size_t to_drain = ident->left.len;
1832
1833 if (*osize_p < to_drain)
1834 to_drain = *osize_p;
1835 if (to_drain) {
1836 memcpy(*output_p, ident->left.buf, to_drain);
1837 strbuf_remove(&ident->left, 0, to_drain);
1838 *output_p += to_drain;
1839 *osize_p -= to_drain;
1840 }
1841 if (!ident->left.len)
1842 ident->state = 0;
1843 }
1844
1845 static int ident_filter_fn(struct stream_filter *filter,
1846 const char *input, size_t *isize_p,
1847 char *output, size_t *osize_p)
1848 {
1849 struct ident_filter *ident = (struct ident_filter *)filter;
1850 static const char head[] = "$Id";
1851
1852 if (!input) {
1853 /* drain upon eof */
1854 switch (ident->state) {
1855 default:
1856 strbuf_add(&ident->left, head, ident->state);
1857 /* fallthrough */
1858 case IDENT_SKIPPING:
1859 /* fallthrough */
1860 case IDENT_DRAINING:
1861 ident_drain(ident, &output, osize_p);
1862 }
1863 return 0;
1864 }
1865
1866 while (*isize_p || (ident->state == IDENT_DRAINING)) {
1867 int ch;
1868
1869 if (ident->state == IDENT_DRAINING) {
1870 ident_drain(ident, &output, osize_p);
1871 if (!*osize_p)
1872 break;
1873 continue;
1874 }
1875
1876 ch = *(input++);
1877 (*isize_p)--;
1878
1879 if (ident->state == IDENT_SKIPPING) {
1880 /*
1881 * Skipping until '$' or LF, but keeping them
1882 * in case it is a foreign ident.
1883 */
1884 strbuf_addch(&ident->left, ch);
1885 if (ch != '\n' && ch != '$')
1886 continue;
1887 if (ch == '$' && !is_foreign_ident(ident->left.buf)) {
1888 strbuf_setlen(&ident->left, sizeof(head) - 1);
1889 strbuf_addstr(&ident->left, ident->ident);
1890 }
1891 ident->state = IDENT_DRAINING;
1892 continue;
1893 }
1894
1895 if (ident->state < sizeof(head) &&
1896 head[ident->state] == ch) {
1897 ident->state++;
1898 continue;
1899 }
1900
1901 if (ident->state)
1902 strbuf_add(&ident->left, head, ident->state);
1903 if (ident->state == sizeof(head) - 1) {
1904 if (ch != ':' && ch != '$') {
1905 strbuf_addch(&ident->left, ch);
1906 ident->state = 0;
1907 continue;
1908 }
1909
1910 if (ch == ':') {
1911 strbuf_addch(&ident->left, ch);
1912 ident->state = IDENT_SKIPPING;
1913 } else {
1914 strbuf_addstr(&ident->left, ident->ident);
1915 ident->state = IDENT_DRAINING;
1916 }
1917 continue;
1918 }
1919
1920 strbuf_addch(&ident->left, ch);
1921 ident->state = IDENT_DRAINING;
1922 }
1923 return 0;
1924 }
1925
1926 static void ident_free_fn(struct stream_filter *filter)
1927 {
1928 struct ident_filter *ident = (struct ident_filter *)filter;
1929 strbuf_release(&ident->left);
1930 free(filter);
1931 }
1932
1933 static struct stream_filter_vtbl ident_vtbl = {
1934 .filter = ident_filter_fn,
1935 .free = ident_free_fn,
1936 };
1937
1938 static struct stream_filter *ident_filter(const struct object_id *oid)
1939 {
1940 struct ident_filter *ident = xmalloc(sizeof(*ident));
1941
1942 xsnprintf(ident->ident, sizeof(ident->ident),
1943 ": %s $", oid_to_hex(oid));
1944 strbuf_init(&ident->left, 0);
1945 ident->filter.vtbl = &ident_vtbl;
1946 ident->state = 0;
1947 return (struct stream_filter *)ident;
1948 }
1949
1950 /*
1951 * Return an appropriately constructed filter for the given ca, or NULL if
1952 * the contents cannot be filtered without reading the whole thing
1953 * in-core.
1954 *
1955 * Note that you would be crazy to set CRLF, smudge/clean or ident to a
1956 * large binary blob you would want us not to slurp into the memory!
1957 */
1958 struct stream_filter *get_stream_filter_ca(const struct conv_attrs *ca,
1959 const struct object_id *oid)
1960 {
1961 struct stream_filter *filter = NULL;
1962
1963 if (classify_conv_attrs(ca) != CA_CLASS_STREAMABLE)
1964 return NULL;
1965
1966 if (ca->ident)
1967 filter = ident_filter(oid);
1968
1969 if (output_eol(ca->crlf_action) == EOL_CRLF)
1970 filter = cascade_filter(filter, lf_to_crlf_filter());
1971 else
1972 filter = cascade_filter(filter, &null_filter_singleton);
1973
1974 return filter;
1975 }
1976
1977 struct stream_filter *get_stream_filter(struct index_state *istate,
1978 const char *path,
1979 const struct object_id *oid)
1980 {
1981 struct conv_attrs ca;
1982 convert_attrs(istate, &ca, path);
1983 return get_stream_filter_ca(&ca, oid);
1984 }
1985
1986 void free_stream_filter(struct stream_filter *filter)
1987 {
1988 filter->vtbl->free(filter);
1989 }
1990
1991 int stream_filter(struct stream_filter *filter,
1992 const char *input, size_t *isize_p,
1993 char *output, size_t *osize_p)
1994 {
1995 return filter->vtbl->filter(filter, input, isize_p, output, osize_p);
1996 }
1997
1998 void init_checkout_metadata(struct checkout_metadata *meta, const char *refname,
1999 const struct object_id *treeish,
2000 const struct object_id *blob)
2001 {
2002 memset(meta, 0, sizeof(*meta));
2003 if (refname)
2004 meta->refname = refname;
2005 if (treeish)
2006 oidcpy(&meta->treeish, treeish);
2007 if (blob)
2008 oidcpy(&meta->blob, blob);
2009 }
2010
2011 void clone_checkout_metadata(struct checkout_metadata *dst,
2012 const struct checkout_metadata *src,
2013 const struct object_id *blob)
2014 {
2015 memcpy(dst, src, sizeof(*dst));
2016 if (blob)
2017 oidcpy(&dst->blob, blob);
2018 }
2019
2020 enum conv_attrs_classification classify_conv_attrs(const struct conv_attrs *ca)
2021 {
2022 if (ca->drv) {
2023 if (ca->drv->process)
2024 return CA_CLASS_INCORE_PROCESS;
2025 if (ca->drv->smudge || ca->drv->clean)
2026 return CA_CLASS_INCORE_FILTER;
2027 }
2028
2029 if (ca->working_tree_encoding)
2030 return CA_CLASS_INCORE;
2031
2032 if (ca->crlf_action == CRLF_AUTO || ca->crlf_action == CRLF_AUTO_CRLF)
2033 return CA_CLASS_INCORE;
2034
2035 return CA_CLASS_STREAMABLE;
2036 }
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