-
Notifications
You must be signed in to change notification settings - Fork 0
/
convert.c
1639 lines (1411 loc) · 38.5 KB
/
convert.c
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
#define NO_THE_INDEX_COMPATIBILITY_MACROS
#include "cache.h"
#include "config.h"
#include "attr.h"
#include "run-command.h"
#include "quote.h"
#include "sigchain.h"
#include "pkt-line.h"
#include "sub-process.h"
/*
* convert.c - convert a file when checking it out and checking it in.
*
* This should use the pathname to decide on whether it wants to do some
* more interesting conversions (automatic gzip/unzip, general format
* conversions etc etc), but by default it just does automatic CRLF<->LF
* translation when the "text" attribute or "auto_crlf" option is set.
*/
/* Stat bits: When BIN is set, the txt bits are unset */
#define CONVERT_STAT_BITS_TXT_LF 0x1
#define CONVERT_STAT_BITS_TXT_CRLF 0x2
#define CONVERT_STAT_BITS_BIN 0x4
enum crlf_action {
CRLF_UNDEFINED,
CRLF_BINARY,
CRLF_TEXT,
CRLF_TEXT_INPUT,
CRLF_TEXT_CRLF,
CRLF_AUTO,
CRLF_AUTO_INPUT,
CRLF_AUTO_CRLF
};
struct text_stat {
/* NUL, CR, LF and CRLF counts */
unsigned nul, lonecr, lonelf, crlf;
/* These are just approximations! */
unsigned printable, nonprintable;
};
static void gather_stats(const char *buf, unsigned long size, struct text_stat *stats)
{
unsigned long i;
memset(stats, 0, sizeof(*stats));
for (i = 0; i < size; i++) {
unsigned char c = buf[i];
if (c == '\r') {
if (i+1 < size && buf[i+1] == '\n') {
stats->crlf++;
i++;
} else
stats->lonecr++;
continue;
}
if (c == '\n') {
stats->lonelf++;
continue;
}
if (c == 127)
/* DEL */
stats->nonprintable++;
else if (c < 32) {
switch (c) {
/* BS, HT, ESC and FF */
case '\b': case '\t': case '\033': case '\014':
stats->printable++;
break;
case 0:
stats->nul++;
/* fall through */
default:
stats->nonprintable++;
}
}
else
stats->printable++;
}
/* If file ends with EOF then don't count this EOF as non-printable. */
if (size >= 1 && buf[size-1] == '\032')
stats->nonprintable--;
}
/*
* The same heuristics as diff.c::mmfile_is_binary()
* We treat files with bare CR as binary
*/
static int convert_is_binary(unsigned long size, const struct text_stat *stats)
{
if (stats->lonecr)
return 1;
if (stats->nul)
return 1;
if ((stats->printable >> 7) < stats->nonprintable)
return 1;
return 0;
}
static unsigned int gather_convert_stats(const char *data, unsigned long size)
{
struct text_stat stats;
int ret = 0;
if (!data || !size)
return 0;
gather_stats(data, size, &stats);
if (convert_is_binary(size, &stats))
ret |= CONVERT_STAT_BITS_BIN;
if (stats.crlf)
ret |= CONVERT_STAT_BITS_TXT_CRLF;
if (stats.lonelf)
ret |= CONVERT_STAT_BITS_TXT_LF;
return ret;
}
static const char *gather_convert_stats_ascii(const char *data, unsigned long size)
{
unsigned int convert_stats = gather_convert_stats(data, size);
if (convert_stats & CONVERT_STAT_BITS_BIN)
return "-text";
switch (convert_stats) {
case CONVERT_STAT_BITS_TXT_LF:
return "lf";
case CONVERT_STAT_BITS_TXT_CRLF:
return "crlf";
case CONVERT_STAT_BITS_TXT_LF | CONVERT_STAT_BITS_TXT_CRLF:
return "mixed";
default:
return "none";
}
}
const char *get_cached_convert_stats_ascii(const struct index_state *istate,
const char *path)
{
const char *ret;
unsigned long sz;
void *data = read_blob_data_from_index(istate, path, &sz);
ret = gather_convert_stats_ascii(data, sz);
free(data);
return ret;
}
const char *get_wt_convert_stats_ascii(const char *path)
{
const char *ret = "";
struct strbuf sb = STRBUF_INIT;
if (strbuf_read_file(&sb, path, 0) >= 0)
ret = gather_convert_stats_ascii(sb.buf, sb.len);
strbuf_release(&sb);
return ret;
}
static int text_eol_is_crlf(void)
{
if (auto_crlf == AUTO_CRLF_TRUE)
return 1;
else if (auto_crlf == AUTO_CRLF_INPUT)
return 0;
if (core_eol == EOL_CRLF)
return 1;
if (core_eol == EOL_UNSET && EOL_NATIVE == EOL_CRLF)
return 1;
return 0;
}
static enum eol output_eol(enum crlf_action crlf_action)
{
switch (crlf_action) {
case CRLF_BINARY:
return EOL_UNSET;
case CRLF_TEXT_CRLF:
return EOL_CRLF;
case CRLF_TEXT_INPUT:
return EOL_LF;
case CRLF_UNDEFINED:
case CRLF_AUTO_CRLF:
return EOL_CRLF;
case CRLF_AUTO_INPUT:
return EOL_LF;
case CRLF_TEXT:
case CRLF_AUTO:
/* fall through */
return text_eol_is_crlf() ? EOL_CRLF : EOL_LF;
}
warning("Illegal crlf_action %d\n", (int)crlf_action);
return core_eol;
}
static void check_safe_crlf(const char *path, enum crlf_action crlf_action,
struct text_stat *old_stats, struct text_stat *new_stats,
enum safe_crlf checksafe)
{
if (old_stats->crlf && !new_stats->crlf ) {
/*
* CRLFs would not be restored by checkout
*/
if (checksafe == SAFE_CRLF_WARN)
warning(_("CRLF will be replaced by LF in %s.\n"
"The file will have its original line"
" endings in your working directory."), path);
else /* i.e. SAFE_CRLF_FAIL */
die(_("CRLF would be replaced by LF in %s."), path);
} else if (old_stats->lonelf && !new_stats->lonelf ) {
/*
* CRLFs would be added by checkout
*/
if (checksafe == SAFE_CRLF_WARN)
warning(_("LF will be replaced by CRLF in %s.\n"
"The file will have its original line"
" endings in your working directory."), path);
else /* i.e. SAFE_CRLF_FAIL */
die(_("LF would be replaced by CRLF in %s"), path);
}
}
static int has_cr_in_index(const struct index_state *istate, const char *path)
{
unsigned long sz;
void *data;
int has_cr;
data = read_blob_data_from_index(istate, path, &sz);
if (!data)
return 0;
has_cr = memchr(data, '\r', sz) != NULL;
free(data);
return has_cr;
}
static int will_convert_lf_to_crlf(size_t len, struct text_stat *stats,
enum crlf_action crlf_action)
{
if (output_eol(crlf_action) != EOL_CRLF)
return 0;
/* No "naked" LF? Nothing to convert, regardless. */
if (!stats->lonelf)
return 0;
if (crlf_action == CRLF_AUTO || crlf_action == CRLF_AUTO_INPUT || crlf_action == CRLF_AUTO_CRLF) {
/* If we have any CR or CRLF line endings, we do not touch it */
/* This is the new safer autocrlf-handling */
if (stats->lonecr || stats->crlf)
return 0;
if (convert_is_binary(len, stats))
return 0;
}
return 1;
}
static int crlf_to_git(const struct index_state *istate,
const char *path, const char *src, size_t len,
struct strbuf *buf,
enum crlf_action crlf_action, enum safe_crlf checksafe)
{
struct text_stat stats;
char *dst;
int convert_crlf_into_lf;
if (crlf_action == CRLF_BINARY ||
(src && !len))
return 0;
/*
* If we are doing a dry-run and have no source buffer, there is
* nothing to analyze; we must assume we would convert.
*/
if (!buf && !src)
return 1;
gather_stats(src, len, &stats);
/* Optimization: No CRLF? Nothing to convert, regardless. */
convert_crlf_into_lf = !!stats.crlf;
if (crlf_action == CRLF_AUTO || crlf_action == CRLF_AUTO_INPUT || crlf_action == CRLF_AUTO_CRLF) {
if (convert_is_binary(len, &stats))
return 0;
/*
* If the file in the index has any CR in it, do not
* convert. This is the new safer autocrlf handling,
* unless we want to renormalize in a merge or
* cherry-pick.
*/
if ((checksafe != SAFE_CRLF_RENORMALIZE) &&
has_cr_in_index(istate, path))
convert_crlf_into_lf = 0;
}
if ((checksafe == SAFE_CRLF_WARN ||
(checksafe == SAFE_CRLF_FAIL)) && len) {
struct text_stat new_stats;
memcpy(&new_stats, &stats, sizeof(new_stats));
/* simulate "git add" */
if (convert_crlf_into_lf) {
new_stats.lonelf += new_stats.crlf;
new_stats.crlf = 0;
}
/* simulate "git checkout" */
if (will_convert_lf_to_crlf(len, &new_stats, crlf_action)) {
new_stats.crlf += new_stats.lonelf;
new_stats.lonelf = 0;
}
check_safe_crlf(path, crlf_action, &stats, &new_stats, checksafe);
}
if (!convert_crlf_into_lf)
return 0;
/*
* At this point all of our source analysis is done, and we are sure we
* would convert. If we are in dry-run mode, we can give an answer.
*/
if (!buf)
return 1;
/* only grow if not in place */
if (strbuf_avail(buf) + buf->len < len)
strbuf_grow(buf, len - buf->len);
dst = buf->buf;
if (crlf_action == CRLF_AUTO || crlf_action == CRLF_AUTO_INPUT || crlf_action == CRLF_AUTO_CRLF) {
/*
* If we guessed, we already know we rejected a file with
* lone CR, and we can strip a CR without looking at what
* follow it.
*/
do {
unsigned char c = *src++;
if (c != '\r')
*dst++ = c;
} while (--len);
} else {
do {
unsigned char c = *src++;
if (! (c == '\r' && (1 < len && *src == '\n')))
*dst++ = c;
} while (--len);
}
strbuf_setlen(buf, dst - buf->buf);
return 1;
}
static int crlf_to_worktree(const char *path, const char *src, size_t len,
struct strbuf *buf, enum crlf_action crlf_action)
{
char *to_free = NULL;
struct text_stat stats;
if (!len || output_eol(crlf_action) != EOL_CRLF)
return 0;
gather_stats(src, len, &stats);
if (!will_convert_lf_to_crlf(len, &stats, crlf_action))
return 0;
/* are we "faking" in place editing ? */
if (src == buf->buf)
to_free = strbuf_detach(buf, NULL);
strbuf_grow(buf, len + stats.lonelf);
for (;;) {
const char *nl = memchr(src, '\n', len);
if (!nl)
break;
if (nl > src && nl[-1] == '\r') {
strbuf_add(buf, src, nl + 1 - src);
} else {
strbuf_add(buf, src, nl - src);
strbuf_addstr(buf, "\r\n");
}
len -= nl + 1 - src;
src = nl + 1;
}
strbuf_add(buf, src, len);
free(to_free);
return 1;
}
struct filter_params {
const char *src;
unsigned long size;
int fd;
const char *cmd;
const char *path;
};
static int filter_buffer_or_fd(int in, int out, void *data)
{
/*
* Spawn cmd and feed the buffer contents through its stdin.
*/
struct child_process child_process = CHILD_PROCESS_INIT;
struct filter_params *params = (struct filter_params *)data;
int write_err, status;
const char *argv[] = { NULL, NULL };
/* apply % substitution to cmd */
struct strbuf cmd = STRBUF_INIT;
struct strbuf path = STRBUF_INIT;
struct strbuf_expand_dict_entry dict[] = {
{ "f", NULL, },
{ NULL, NULL, },
};
/* quote the path to preserve spaces, etc. */
sq_quote_buf(&path, params->path);
dict[0].value = path.buf;
/* expand all %f with the quoted path */
strbuf_expand(&cmd, params->cmd, strbuf_expand_dict_cb, &dict);
strbuf_release(&path);
argv[0] = cmd.buf;
child_process.argv = argv;
child_process.use_shell = 1;
child_process.in = -1;
child_process.out = out;
if (start_command(&child_process))
return error("cannot fork to run external filter '%s'", params->cmd);
sigchain_push(SIGPIPE, SIG_IGN);
if (params->src) {
write_err = (write_in_full(child_process.in,
params->src, params->size) < 0);
if (errno == EPIPE)
write_err = 0;
} else {
write_err = copy_fd(params->fd, child_process.in);
if (write_err == COPY_WRITE_ERROR && errno == EPIPE)
write_err = 0;
}
if (close(child_process.in))
write_err = 1;
if (write_err)
error("cannot feed the input to external filter '%s'", params->cmd);
sigchain_pop(SIGPIPE);
status = finish_command(&child_process);
if (status)
error("external filter '%s' failed %d", params->cmd, status);
strbuf_release(&cmd);
return (write_err || status);
}
static int apply_single_file_filter(const char *path, const char *src, size_t len, int fd,
struct strbuf *dst, const char *cmd)
{
/*
* Create a pipeline to have the command filter the buffer's
* contents.
*
* (child --> cmd) --> us
*/
int err = 0;
struct strbuf nbuf = STRBUF_INIT;
struct async async;
struct filter_params params;
memset(&async, 0, sizeof(async));
async.proc = filter_buffer_or_fd;
async.data = ¶ms;
async.out = -1;
params.src = src;
params.size = len;
params.fd = fd;
params.cmd = cmd;
params.path = path;
fflush(NULL);
if (start_async(&async))
return 0; /* error was already reported */
if (strbuf_read(&nbuf, async.out, len) < 0) {
err = error("read from external filter '%s' failed", cmd);
}
if (close(async.out)) {
err = error("read from external filter '%s' failed", cmd);
}
if (finish_async(&async)) {
err = error("external filter '%s' failed", cmd);
}
if (!err) {
strbuf_swap(dst, &nbuf);
}
strbuf_release(&nbuf);
return !err;
}
#define CAP_CLEAN (1u<<0)
#define CAP_SMUDGE (1u<<1)
struct cmd2process {
struct subprocess_entry subprocess; /* must be the first member! */
unsigned int supported_capabilities;
};
static int subprocess_map_initialized;
static struct hashmap subprocess_map;
static int start_multi_file_filter_fn(struct subprocess_entry *subprocess)
{
int err;
struct cmd2process *entry = (struct cmd2process *)subprocess;
struct string_list cap_list = STRING_LIST_INIT_NODUP;
char *cap_buf;
const char *cap_name;
struct child_process *process = &subprocess->process;
const char *cmd = subprocess->cmd;
sigchain_push(SIGPIPE, SIG_IGN);
err = packet_writel(process->in, "git-filter-client", "version=2", NULL);
if (err)
goto done;
err = strcmp(packet_read_line(process->out, NULL), "git-filter-server");
if (err) {
error("external filter '%s' does not support filter protocol version 2", cmd);
goto done;
}
err = strcmp(packet_read_line(process->out, NULL), "version=2");
if (err)
goto done;
err = packet_read_line(process->out, NULL) != NULL;
if (err)
goto done;
err = packet_writel(process->in, "capability=clean", "capability=smudge", NULL);
for (;;) {
cap_buf = packet_read_line(process->out, NULL);
if (!cap_buf)
break;
string_list_split_in_place(&cap_list, cap_buf, '=', 1);
if (cap_list.nr != 2 || strcmp(cap_list.items[0].string, "capability"))
continue;
cap_name = cap_list.items[1].string;
if (!strcmp(cap_name, "clean")) {
entry->supported_capabilities |= CAP_CLEAN;
} else if (!strcmp(cap_name, "smudge")) {
entry->supported_capabilities |= CAP_SMUDGE;
} else {
warning(
"external filter '%s' requested unsupported filter capability '%s'",
cmd, cap_name
);
}
string_list_clear(&cap_list, 0);
}
done:
sigchain_pop(SIGPIPE);
return err;
}
static int apply_multi_file_filter(const char *path, const char *src, size_t len,
int fd, struct strbuf *dst, const char *cmd,
const unsigned int wanted_capability)
{
int err;
struct cmd2process *entry;
struct child_process *process;
struct strbuf nbuf = STRBUF_INIT;
struct strbuf filter_status = STRBUF_INIT;
const char *filter_type;
if (!subprocess_map_initialized) {
subprocess_map_initialized = 1;
hashmap_init(&subprocess_map, (hashmap_cmp_fn) cmd2process_cmp, 0);
entry = NULL;
} else {
entry = (struct cmd2process *)subprocess_find_entry(&subprocess_map, cmd);
}
fflush(NULL);
if (!entry) {
entry = xmalloc(sizeof(*entry));
entry->supported_capabilities = 0;
if (subprocess_start(&subprocess_map, &entry->subprocess, cmd, start_multi_file_filter_fn)) {
free(entry);
return 0;
}
}
process = &entry->subprocess.process;
if (!(wanted_capability & entry->supported_capabilities))
return 0;
if (CAP_CLEAN & wanted_capability)
filter_type = "clean";
else if (CAP_SMUDGE & wanted_capability)
filter_type = "smudge";
else
die("unexpected filter type");
sigchain_push(SIGPIPE, SIG_IGN);
assert(strlen(filter_type) < LARGE_PACKET_DATA_MAX - strlen("command=\n"));
err = packet_write_fmt_gently(process->in, "command=%s\n", filter_type);
if (err)
goto done;
err = strlen(path) > LARGE_PACKET_DATA_MAX - strlen("pathname=\n");
if (err) {
error("path name too long for external filter");
goto done;
}
err = packet_write_fmt_gently(process->in, "pathname=%s\n", path);
if (err)
goto done;
err = packet_flush_gently(process->in);
if (err)
goto done;
if (fd >= 0)
err = write_packetized_from_fd(fd, process->in);
else
err = write_packetized_from_buf(src, len, process->in);
if (err)
goto done;
err = subprocess_read_status(process->out, &filter_status);
if (err)
goto done;
err = strcmp(filter_status.buf, "success");
if (err)
goto done;
err = read_packetized_to_strbuf(process->out, &nbuf) < 0;
if (err)
goto done;
err = subprocess_read_status(process->out, &filter_status);
if (err)
goto done;
err = strcmp(filter_status.buf, "success");
done:
sigchain_pop(SIGPIPE);
if (err) {
if (!strcmp(filter_status.buf, "error")) {
/* The filter signaled a problem with the file. */
} else if (!strcmp(filter_status.buf, "abort")) {
/*
* The filter signaled a permanent problem. Don't try to filter
* files with the same command for the lifetime of the current
* Git process.
*/
entry->supported_capabilities &= ~wanted_capability;
} else {
/*
* Something went wrong with the protocol filter.
* Force shutdown and restart if another blob requires filtering.
*/
error("external filter '%s' failed", cmd);
subprocess_stop(&subprocess_map, &entry->subprocess);
free(entry);
}
} else {
strbuf_swap(dst, &nbuf);
}
strbuf_release(&nbuf);
return !err;
}
static struct convert_driver {
const char *name;
struct convert_driver *next;
const char *smudge;
const char *clean;
const char *process;
int required;
} *user_convert, **user_convert_tail;
static int apply_filter(const char *path, const char *src, size_t len,
int fd, struct strbuf *dst, struct convert_driver *drv,
const unsigned int wanted_capability)
{
const char *cmd = NULL;
if (!drv)
return 0;
if (!dst)
return 1;
if ((CAP_CLEAN & wanted_capability) && !drv->process && drv->clean)
cmd = drv->clean;
else if ((CAP_SMUDGE & wanted_capability) && !drv->process && drv->smudge)
cmd = drv->smudge;
if (cmd && *cmd)
return apply_single_file_filter(path, src, len, fd, dst, cmd);
else if (drv->process && *drv->process)
return apply_multi_file_filter(path, src, len, fd, dst, drv->process, wanted_capability);
return 0;
}
static int read_convert_config(const char *var, const char *value, void *cb)
{
const char *key, *name;
int namelen;
struct convert_driver *drv;
/*
* External conversion drivers are configured using
* "filter.<name>.variable".
*/
if (parse_config_key(var, "filter", &name, &namelen, &key) < 0 || !name)
return 0;
for (drv = user_convert; drv; drv = drv->next)
if (!strncmp(drv->name, name, namelen) && !drv->name[namelen])
break;
if (!drv) {
drv = xcalloc(1, sizeof(struct convert_driver));
drv->name = xmemdupz(name, namelen);
*user_convert_tail = drv;
user_convert_tail = &(drv->next);
}
/*
* filter.<name>.smudge and filter.<name>.clean specifies
* the command line:
*
* command-line
*
* The command-line will not be interpolated in any way.
*/
if (!strcmp("smudge", key))
return git_config_string(&drv->smudge, var, value);
if (!strcmp("clean", key))
return git_config_string(&drv->clean, var, value);
if (!strcmp("process", key))
return git_config_string(&drv->process, var, value);
if (!strcmp("required", key)) {
drv->required = git_config_bool(var, value);
return 0;
}
return 0;
}
static int count_ident(const char *cp, unsigned long size)
{
/*
* "$Id: 0000000000000000000000000000000000000000 $" <=> "$Id$"
*/
int cnt = 0;
char ch;
while (size) {
ch = *cp++;
size--;
if (ch != '$')
continue;
if (size < 3)
break;
if (memcmp("Id", cp, 2))
continue;
ch = cp[2];
cp += 3;
size -= 3;
if (ch == '$')
cnt++; /* $Id$ */
if (ch != ':')
continue;
/*
* "$Id: ... "; scan up to the closing dollar sign and discard.
*/
while (size) {
ch = *cp++;
size--;
if (ch == '$') {
cnt++;
break;
}
if (ch == '\n')
break;
}
}
return cnt;
}
static int ident_to_git(const char *path, const char *src, size_t len,
struct strbuf *buf, int ident)
{
char *dst, *dollar;
if (!ident || (src && !count_ident(src, len)))
return 0;
if (!buf)
return 1;
/* only grow if not in place */
if (strbuf_avail(buf) + buf->len < len)
strbuf_grow(buf, len - buf->len);
dst = buf->buf;
for (;;) {
dollar = memchr(src, '$', len);
if (!dollar)
break;
memmove(dst, src, dollar + 1 - src);
dst += dollar + 1 - src;
len -= dollar + 1 - src;
src = dollar + 1;
if (len > 3 && !memcmp(src, "Id:", 3)) {
dollar = memchr(src + 3, '$', len - 3);
if (!dollar)
break;
if (memchr(src + 3, '\n', dollar - src - 3)) {
/* Line break before the next dollar. */
continue;
}
memcpy(dst, "Id$", 3);
dst += 3;
len -= dollar + 1 - src;
src = dollar + 1;
}
}
memmove(dst, src, len);
strbuf_setlen(buf, dst + len - buf->buf);
return 1;
}
static int ident_to_worktree(const char *path, const char *src, size_t len,
struct strbuf *buf, int ident)
{
unsigned char sha1[20];
char *to_free = NULL, *dollar, *spc;
int cnt;
if (!ident)
return 0;
cnt = count_ident(src, len);
if (!cnt)
return 0;
/* are we "faking" in place editing ? */
if (src == buf->buf)
to_free = strbuf_detach(buf, NULL);
hash_sha1_file(src, len, "blob", sha1);
strbuf_grow(buf, len + cnt * 43);
for (;;) {
/* step 1: run to the next '$' */
dollar = memchr(src, '$', len);
if (!dollar)
break;
strbuf_add(buf, src, dollar + 1 - src);
len -= dollar + 1 - src;
src = dollar + 1;
/* step 2: does it looks like a bit like Id:xxx$ or Id$ ? */
if (len < 3 || memcmp("Id", src, 2))
continue;
/* step 3: skip over Id$ or Id:xxxxx$ */
if (src[2] == '$') {
src += 3;
len -= 3;
} else if (src[2] == ':') {
/*
* It's possible that an expanded Id has crept its way into the
* repository, we cope with that by stripping the expansion out.
* This is probably not a good idea, since it will cause changes
* on checkout, which won't go away by stash, but let's keep it
* for git-style ids.
*/
dollar = memchr(src + 3, '$', len - 3);
if (!dollar) {
/* incomplete keyword, no more '$', so just quit the loop */
break;
}
if (memchr(src + 3, '\n', dollar - src - 3)) {
/* Line break before the next dollar. */
continue;
}
spc = memchr(src + 4, ' ', dollar - src - 4);
if (spc && spc < dollar-1) {
/* There are spaces in unexpected places.
* This is probably an id from some other
* versioning system. Keep it for now.
*/
continue;
}
len -= dollar + 1 - src;
src = dollar + 1;
} else {
/* it wasn't a "Id$" or "Id:xxxx$" */
continue;
}
/* step 4: substitute */
strbuf_addstr(buf, "Id: ");
strbuf_add(buf, sha1_to_hex(sha1), 40);
strbuf_addstr(buf, " $");
}
strbuf_add(buf, src, len);
free(to_free);
return 1;
}
static enum crlf_action git_path_check_crlf(struct attr_check_item *check)
{
const char *value = check->value;
if (ATTR_TRUE(value))
return CRLF_TEXT;
else if (ATTR_FALSE(value))
return CRLF_BINARY;
else if (ATTR_UNSET(value))
;
else if (!strcmp(value, "input"))
return CRLF_TEXT_INPUT;
else if (!strcmp(value, "auto"))
return CRLF_AUTO;
return CRLF_UNDEFINED;
}
static enum eol git_path_check_eol(struct attr_check_item *check)
{
const char *value = check->value;
if (ATTR_UNSET(value))
;
else if (!strcmp(value, "lf"))
return EOL_LF;
else if (!strcmp(value, "crlf"))
return EOL_CRLF;
return EOL_UNSET;
}
static struct convert_driver *git_path_check_convert(struct attr_check_item *check)
{
const char *value = check->value;
struct convert_driver *drv;
if (ATTR_TRUE(value) || ATTR_FALSE(value) || ATTR_UNSET(value))
return NULL;
for (drv = user_convert; drv; drv = drv->next)
if (!strcmp(value, drv->name))
return drv;
return NULL;
}
static int git_path_check_ident(struct attr_check_item *check)
{
const char *value = check->value;
return !!ATTR_TRUE(value);
}
struct conv_attrs {
struct convert_driver *drv;
enum crlf_action attr_action; /* What attr says */
enum crlf_action crlf_action; /* When no attr is set, use core.autocrlf */
int ident;
};
static void convert_attrs(struct conv_attrs *ca, const char *path)
{
static struct attr_check *check;