2faccd7e2f803f950ee92153408bee71dabee1bf
1#include "cache.h"
2#include "string-list.h"
3#include "run-command.h"
4#include "commit.h"
5#include "tempfile.h"
6#include "trailer.h"
7#include "list.h"
8/*
9 * Copyright (c) 2013, 2014 Christian Couder <chriscool@tuxfamily.org>
10 */
11
12enum action_where { WHERE_END, WHERE_AFTER, WHERE_BEFORE, WHERE_START };
13enum action_if_exists { EXISTS_ADD_IF_DIFFERENT_NEIGHBOR, EXISTS_ADD_IF_DIFFERENT,
14 EXISTS_ADD, EXISTS_REPLACE, EXISTS_DO_NOTHING };
15enum action_if_missing { MISSING_ADD, MISSING_DO_NOTHING };
16
17struct conf_info {
18 char *name;
19 char *key;
20 char *command;
21 enum action_where where;
22 enum action_if_exists if_exists;
23 enum action_if_missing if_missing;
24};
25
26static struct conf_info default_conf_info;
27
28struct trailer_item {
29 struct list_head list;
30 /*
31 * If this is not a trailer line, the line is stored in value
32 * (excluding the terminating newline) and token is NULL.
33 */
34 char *token;
35 char *value;
36};
37
38struct arg_item {
39 struct list_head list;
40 char *token;
41 char *value;
42 struct conf_info conf;
43};
44
45static LIST_HEAD(conf_head);
46
47static char *separators = ":";
48
49#define TRAILER_ARG_STRING "$ARG"
50
51static const char *git_generated_prefixes[] = {
52 "Signed-off-by: ",
53 "(cherry picked from commit ",
54 NULL
55};
56
57/* Iterate over the elements of the list. */
58#define list_for_each_dir(pos, head, is_reverse) \
59 for (pos = is_reverse ? (head)->prev : (head)->next; \
60 pos != (head); \
61 pos = is_reverse ? pos->prev : pos->next)
62
63static int after_or_end(enum action_where where)
64{
65 return (where == WHERE_AFTER) || (where == WHERE_END);
66}
67
68/*
69 * Return the length of the string not including any final
70 * punctuation. E.g., the input "Signed-off-by:" would return
71 * 13, stripping the trailing punctuation but retaining
72 * internal punctuation.
73 */
74static size_t token_len_without_separator(const char *token, size_t len)
75{
76 while (len > 0 && !isalnum(token[len - 1]))
77 len--;
78 return len;
79}
80
81static int same_token(struct trailer_item *a, struct arg_item *b)
82{
83 size_t a_len, b_len, min_len;
84
85 if (!a->token)
86 return 0;
87
88 a_len = token_len_without_separator(a->token, strlen(a->token));
89 b_len = token_len_without_separator(b->token, strlen(b->token));
90 min_len = (a_len > b_len) ? b_len : a_len;
91
92 return !strncasecmp(a->token, b->token, min_len);
93}
94
95static int same_value(struct trailer_item *a, struct arg_item *b)
96{
97 return !strcasecmp(a->value, b->value);
98}
99
100static int same_trailer(struct trailer_item *a, struct arg_item *b)
101{
102 return same_token(a, b) && same_value(a, b);
103}
104
105static inline int is_blank_line(const char *str)
106{
107 const char *s = str;
108 while (*s && *s != '\n' && isspace(*s))
109 s++;
110 return !*s || *s == '\n';
111}
112
113static inline void strbuf_replace(struct strbuf *sb, const char *a, const char *b)
114{
115 const char *ptr = strstr(sb->buf, a);
116 if (ptr)
117 strbuf_splice(sb, ptr - sb->buf, strlen(a), b, strlen(b));
118}
119
120static void free_trailer_item(struct trailer_item *item)
121{
122 free(item->token);
123 free(item->value);
124 free(item);
125}
126
127static void free_arg_item(struct arg_item *item)
128{
129 free(item->conf.name);
130 free(item->conf.key);
131 free(item->conf.command);
132 free(item->token);
133 free(item->value);
134 free(item);
135}
136
137static char last_non_space_char(const char *s)
138{
139 int i;
140 for (i = strlen(s) - 1; i >= 0; i--)
141 if (!isspace(s[i]))
142 return s[i];
143 return '\0';
144}
145
146static void print_tok_val(FILE *outfile, const char *tok, const char *val)
147{
148 char c;
149
150 if (!tok) {
151 fprintf(outfile, "%s\n", val);
152 return;
153 }
154
155 c = last_non_space_char(tok);
156 if (!c)
157 return;
158 if (strchr(separators, c))
159 fprintf(outfile, "%s%s\n", tok, val);
160 else
161 fprintf(outfile, "%s%c %s\n", tok, separators[0], val);
162}
163
164static void print_all(FILE *outfile, struct list_head *head, int trim_empty)
165{
166 struct list_head *pos;
167 struct trailer_item *item;
168 list_for_each(pos, head) {
169 item = list_entry(pos, struct trailer_item, list);
170 if (!trim_empty || strlen(item->value) > 0)
171 print_tok_val(outfile, item->token, item->value);
172 }
173}
174
175static struct trailer_item *trailer_from_arg(struct arg_item *arg_tok)
176{
177 struct trailer_item *new = xcalloc(sizeof(*new), 1);
178 new->token = arg_tok->token;
179 new->value = arg_tok->value;
180 arg_tok->token = arg_tok->value = NULL;
181 free_arg_item(arg_tok);
182 return new;
183}
184
185static void add_arg_to_input_list(struct trailer_item *on_tok,
186 struct arg_item *arg_tok)
187{
188 int aoe = after_or_end(arg_tok->conf.where);
189 struct trailer_item *to_add = trailer_from_arg(arg_tok);
190 if (aoe)
191 list_add(&to_add->list, &on_tok->list);
192 else
193 list_add_tail(&to_add->list, &on_tok->list);
194}
195
196static int check_if_different(struct trailer_item *in_tok,
197 struct arg_item *arg_tok,
198 int check_all,
199 struct list_head *head)
200{
201 enum action_where where = arg_tok->conf.where;
202 struct list_head *next_head;
203 do {
204 if (same_trailer(in_tok, arg_tok))
205 return 0;
206 /*
207 * if we want to add a trailer after another one,
208 * we have to check those before this one
209 */
210 next_head = after_or_end(where) ? in_tok->list.prev
211 : in_tok->list.next;
212 if (next_head == head)
213 break;
214 in_tok = list_entry(next_head, struct trailer_item, list);
215 } while (check_all);
216 return 1;
217}
218
219static char *apply_command(const char *command, const char *arg)
220{
221 struct strbuf cmd = STRBUF_INIT;
222 struct strbuf buf = STRBUF_INIT;
223 struct child_process cp = CHILD_PROCESS_INIT;
224 const char *argv[] = {NULL, NULL};
225 char *result;
226
227 strbuf_addstr(&cmd, command);
228 if (arg)
229 strbuf_replace(&cmd, TRAILER_ARG_STRING, arg);
230
231 argv[0] = cmd.buf;
232 cp.argv = argv;
233 cp.env = local_repo_env;
234 cp.no_stdin = 1;
235 cp.use_shell = 1;
236
237 if (capture_command(&cp, &buf, 1024)) {
238 error(_("running trailer command '%s' failed"), cmd.buf);
239 strbuf_release(&buf);
240 result = xstrdup("");
241 } else {
242 strbuf_trim(&buf);
243 result = strbuf_detach(&buf, NULL);
244 }
245
246 strbuf_release(&cmd);
247 return result;
248}
249
250static void apply_item_command(struct trailer_item *in_tok, struct arg_item *arg_tok)
251{
252 if (arg_tok->conf.command) {
253 const char *arg;
254 if (arg_tok->value && arg_tok->value[0]) {
255 arg = arg_tok->value;
256 } else {
257 if (in_tok && in_tok->value)
258 arg = xstrdup(in_tok->value);
259 else
260 arg = xstrdup("");
261 }
262 arg_tok->value = apply_command(arg_tok->conf.command, arg);
263 free((char *)arg);
264 }
265}
266
267static void apply_arg_if_exists(struct trailer_item *in_tok,
268 struct arg_item *arg_tok,
269 struct trailer_item *on_tok,
270 struct list_head *head)
271{
272 switch (arg_tok->conf.if_exists) {
273 case EXISTS_DO_NOTHING:
274 free_arg_item(arg_tok);
275 break;
276 case EXISTS_REPLACE:
277 apply_item_command(in_tok, arg_tok);
278 add_arg_to_input_list(on_tok, arg_tok);
279 list_del(&in_tok->list);
280 free_trailer_item(in_tok);
281 break;
282 case EXISTS_ADD:
283 apply_item_command(in_tok, arg_tok);
284 add_arg_to_input_list(on_tok, arg_tok);
285 break;
286 case EXISTS_ADD_IF_DIFFERENT:
287 apply_item_command(in_tok, arg_tok);
288 if (check_if_different(in_tok, arg_tok, 1, head))
289 add_arg_to_input_list(on_tok, arg_tok);
290 else
291 free_arg_item(arg_tok);
292 break;
293 case EXISTS_ADD_IF_DIFFERENT_NEIGHBOR:
294 apply_item_command(in_tok, arg_tok);
295 if (check_if_different(on_tok, arg_tok, 0, head))
296 add_arg_to_input_list(on_tok, arg_tok);
297 else
298 free_arg_item(arg_tok);
299 break;
300 }
301}
302
303static void apply_arg_if_missing(struct list_head *head,
304 struct arg_item *arg_tok)
305{
306 enum action_where where;
307 struct trailer_item *to_add;
308
309 switch (arg_tok->conf.if_missing) {
310 case MISSING_DO_NOTHING:
311 free_arg_item(arg_tok);
312 break;
313 case MISSING_ADD:
314 where = arg_tok->conf.where;
315 apply_item_command(NULL, arg_tok);
316 to_add = trailer_from_arg(arg_tok);
317 if (after_or_end(where))
318 list_add_tail(&to_add->list, head);
319 else
320 list_add(&to_add->list, head);
321 }
322}
323
324static int find_same_and_apply_arg(struct list_head *head,
325 struct arg_item *arg_tok)
326{
327 struct list_head *pos;
328 struct trailer_item *in_tok;
329 struct trailer_item *on_tok;
330
331 enum action_where where = arg_tok->conf.where;
332 int middle = (where == WHERE_AFTER) || (where == WHERE_BEFORE);
333 int backwards = after_or_end(where);
334 struct trailer_item *start_tok;
335
336 if (list_empty(head))
337 return 0;
338
339 start_tok = list_entry(backwards ? head->prev : head->next,
340 struct trailer_item,
341 list);
342
343 list_for_each_dir(pos, head, backwards) {
344 in_tok = list_entry(pos, struct trailer_item, list);
345 if (!same_token(in_tok, arg_tok))
346 continue;
347 on_tok = middle ? in_tok : start_tok;
348 apply_arg_if_exists(in_tok, arg_tok, on_tok, head);
349 return 1;
350 }
351 return 0;
352}
353
354static void process_trailers_lists(struct list_head *head,
355 struct list_head *arg_head)
356{
357 struct list_head *pos, *p;
358 struct arg_item *arg_tok;
359
360 list_for_each_safe(pos, p, arg_head) {
361 int applied = 0;
362 arg_tok = list_entry(pos, struct arg_item, list);
363
364 list_del(pos);
365
366 applied = find_same_and_apply_arg(head, arg_tok);
367
368 if (!applied)
369 apply_arg_if_missing(head, arg_tok);
370 }
371}
372
373static int set_where(struct conf_info *item, const char *value)
374{
375 if (!strcasecmp("after", value))
376 item->where = WHERE_AFTER;
377 else if (!strcasecmp("before", value))
378 item->where = WHERE_BEFORE;
379 else if (!strcasecmp("end", value))
380 item->where = WHERE_END;
381 else if (!strcasecmp("start", value))
382 item->where = WHERE_START;
383 else
384 return -1;
385 return 0;
386}
387
388static int set_if_exists(struct conf_info *item, const char *value)
389{
390 if (!strcasecmp("addIfDifferent", value))
391 item->if_exists = EXISTS_ADD_IF_DIFFERENT;
392 else if (!strcasecmp("addIfDifferentNeighbor", value))
393 item->if_exists = EXISTS_ADD_IF_DIFFERENT_NEIGHBOR;
394 else if (!strcasecmp("add", value))
395 item->if_exists = EXISTS_ADD;
396 else if (!strcasecmp("replace", value))
397 item->if_exists = EXISTS_REPLACE;
398 else if (!strcasecmp("doNothing", value))
399 item->if_exists = EXISTS_DO_NOTHING;
400 else
401 return -1;
402 return 0;
403}
404
405static int set_if_missing(struct conf_info *item, const char *value)
406{
407 if (!strcasecmp("doNothing", value))
408 item->if_missing = MISSING_DO_NOTHING;
409 else if (!strcasecmp("add", value))
410 item->if_missing = MISSING_ADD;
411 else
412 return -1;
413 return 0;
414}
415
416static void duplicate_conf(struct conf_info *dst, const struct conf_info *src)
417{
418 *dst = *src;
419 dst->name = xstrdup_or_null(src->name);
420 dst->key = xstrdup_or_null(src->key);
421 dst->command = xstrdup_or_null(src->command);
422}
423
424static struct arg_item *get_conf_item(const char *name)
425{
426 struct list_head *pos;
427 struct arg_item *item;
428
429 /* Look up item with same name */
430 list_for_each(pos, &conf_head) {
431 item = list_entry(pos, struct arg_item, list);
432 if (!strcasecmp(item->conf.name, name))
433 return item;
434 }
435
436 /* Item does not already exists, create it */
437 item = xcalloc(sizeof(*item), 1);
438 duplicate_conf(&item->conf, &default_conf_info);
439 item->conf.name = xstrdup(name);
440
441 list_add_tail(&item->list, &conf_head);
442
443 return item;
444}
445
446enum trailer_info_type { TRAILER_KEY, TRAILER_COMMAND, TRAILER_WHERE,
447 TRAILER_IF_EXISTS, TRAILER_IF_MISSING };
448
449static struct {
450 const char *name;
451 enum trailer_info_type type;
452} trailer_config_items[] = {
453 { "key", TRAILER_KEY },
454 { "command", TRAILER_COMMAND },
455 { "where", TRAILER_WHERE },
456 { "ifexists", TRAILER_IF_EXISTS },
457 { "ifmissing", TRAILER_IF_MISSING }
458};
459
460static int git_trailer_default_config(const char *conf_key, const char *value, void *cb)
461{
462 const char *trailer_item, *variable_name;
463
464 if (!skip_prefix(conf_key, "trailer.", &trailer_item))
465 return 0;
466
467 variable_name = strrchr(trailer_item, '.');
468 if (!variable_name) {
469 if (!strcmp(trailer_item, "where")) {
470 if (set_where(&default_conf_info, value) < 0)
471 warning(_("unknown value '%s' for key '%s'"),
472 value, conf_key);
473 } else if (!strcmp(trailer_item, "ifexists")) {
474 if (set_if_exists(&default_conf_info, value) < 0)
475 warning(_("unknown value '%s' for key '%s'"),
476 value, conf_key);
477 } else if (!strcmp(trailer_item, "ifmissing")) {
478 if (set_if_missing(&default_conf_info, value) < 0)
479 warning(_("unknown value '%s' for key '%s'"),
480 value, conf_key);
481 } else if (!strcmp(trailer_item, "separators")) {
482 separators = xstrdup(value);
483 }
484 }
485 return 0;
486}
487
488static int git_trailer_config(const char *conf_key, const char *value, void *cb)
489{
490 const char *trailer_item, *variable_name;
491 struct arg_item *item;
492 struct conf_info *conf;
493 char *name = NULL;
494 enum trailer_info_type type;
495 int i;
496
497 if (!skip_prefix(conf_key, "trailer.", &trailer_item))
498 return 0;
499
500 variable_name = strrchr(trailer_item, '.');
501 if (!variable_name)
502 return 0;
503
504 variable_name++;
505 for (i = 0; i < ARRAY_SIZE(trailer_config_items); i++) {
506 if (strcmp(trailer_config_items[i].name, variable_name))
507 continue;
508 name = xstrndup(trailer_item, variable_name - trailer_item - 1);
509 type = trailer_config_items[i].type;
510 break;
511 }
512
513 if (!name)
514 return 0;
515
516 item = get_conf_item(name);
517 conf = &item->conf;
518 free(name);
519
520 switch (type) {
521 case TRAILER_KEY:
522 if (conf->key)
523 warning(_("more than one %s"), conf_key);
524 conf->key = xstrdup(value);
525 break;
526 case TRAILER_COMMAND:
527 if (conf->command)
528 warning(_("more than one %s"), conf_key);
529 conf->command = xstrdup(value);
530 break;
531 case TRAILER_WHERE:
532 if (set_where(conf, value))
533 warning(_("unknown value '%s' for key '%s'"), value, conf_key);
534 break;
535 case TRAILER_IF_EXISTS:
536 if (set_if_exists(conf, value))
537 warning(_("unknown value '%s' for key '%s'"), value, conf_key);
538 break;
539 case TRAILER_IF_MISSING:
540 if (set_if_missing(conf, value))
541 warning(_("unknown value '%s' for key '%s'"), value, conf_key);
542 break;
543 default:
544 die("BUG: trailer.c: unhandled type %d", type);
545 }
546 return 0;
547}
548
549static const char *token_from_item(struct arg_item *item, char *tok)
550{
551 if (item->conf.key)
552 return item->conf.key;
553 if (tok)
554 return tok;
555 return item->conf.name;
556}
557
558static int token_matches_item(const char *tok, struct arg_item *item, int tok_len)
559{
560 if (!strncasecmp(tok, item->conf.name, tok_len))
561 return 1;
562 return item->conf.key ? !strncasecmp(tok, item->conf.key, tok_len) : 0;
563}
564
565/*
566 * If the given line is of the form
567 * "<token><optional whitespace><separator>..." or "<separator>...", return the
568 * location of the separator. Otherwise, return -1. The optional whitespace
569 * is allowed there primarily to allow things like "Bug #43" where <token> is
570 * "Bug" and <separator> is "#".
571 *
572 * The separator-starts-line case (in which this function returns 0) is
573 * distinguished from the non-well-formed-line case (in which this function
574 * returns -1) because some callers of this function need such a distinction.
575 */
576static int find_separator(const char *line, const char *separators)
577{
578 int whitespace_found = 0;
579 const char *c;
580 for (c = line; *c; c++) {
581 if (strchr(separators, *c))
582 return c - line;
583 if (!whitespace_found && (isalnum(*c) || *c == '-'))
584 continue;
585 if (c != line && (*c == ' ' || *c == '\t')) {
586 whitespace_found = 1;
587 continue;
588 }
589 break;
590 }
591 return -1;
592}
593
594/*
595 * Obtain the token, value, and conf from the given trailer.
596 *
597 * separator_pos must not be 0, since the token cannot be an empty string.
598 *
599 * If separator_pos is -1, interpret the whole trailer as a token.
600 */
601static void parse_trailer(struct strbuf *tok, struct strbuf *val,
602 const struct conf_info **conf, const char *trailer,
603 int separator_pos)
604{
605 struct arg_item *item;
606 int tok_len;
607 struct list_head *pos;
608
609 if (separator_pos != -1) {
610 strbuf_add(tok, trailer, separator_pos);
611 strbuf_trim(tok);
612 strbuf_addstr(val, trailer + separator_pos + 1);
613 strbuf_trim(val);
614 } else {
615 strbuf_addstr(tok, trailer);
616 strbuf_trim(tok);
617 }
618
619 /* Lookup if the token matches something in the config */
620 tok_len = token_len_without_separator(tok->buf, tok->len);
621 if (conf)
622 *conf = &default_conf_info;
623 list_for_each(pos, &conf_head) {
624 item = list_entry(pos, struct arg_item, list);
625 if (token_matches_item(tok->buf, item, tok_len)) {
626 char *tok_buf = strbuf_detach(tok, NULL);
627 if (conf)
628 *conf = &item->conf;
629 strbuf_addstr(tok, token_from_item(item, tok_buf));
630 free(tok_buf);
631 break;
632 }
633 }
634}
635
636static struct trailer_item *add_trailer_item(struct list_head *head, char *tok,
637 char *val)
638{
639 struct trailer_item *new = xcalloc(sizeof(*new), 1);
640 new->token = tok;
641 new->value = val;
642 list_add_tail(&new->list, head);
643 return new;
644}
645
646static void add_arg_item(struct list_head *arg_head, char *tok, char *val,
647 const struct conf_info *conf)
648{
649 struct arg_item *new = xcalloc(sizeof(*new), 1);
650 new->token = tok;
651 new->value = val;
652 duplicate_conf(&new->conf, conf);
653 list_add_tail(&new->list, arg_head);
654}
655
656static void process_command_line_args(struct list_head *arg_head,
657 struct string_list *trailers)
658{
659 struct string_list_item *tr;
660 struct arg_item *item;
661 struct strbuf tok = STRBUF_INIT;
662 struct strbuf val = STRBUF_INIT;
663 const struct conf_info *conf;
664 struct list_head *pos;
665
666 /*
667 * In command-line arguments, '=' is accepted (in addition to the
668 * separators that are defined).
669 */
670 char *cl_separators = xstrfmt("=%s", separators);
671
672 /* Add an arg item for each configured trailer with a command */
673 list_for_each(pos, &conf_head) {
674 item = list_entry(pos, struct arg_item, list);
675 if (item->conf.command)
676 add_arg_item(arg_head,
677 xstrdup(token_from_item(item, NULL)),
678 xstrdup(""),
679 &item->conf);
680 }
681
682 /* Add an arg item for each trailer on the command line */
683 for_each_string_list_item(tr, trailers) {
684 int separator_pos = find_separator(tr->string, cl_separators);
685 if (separator_pos == 0) {
686 struct strbuf sb = STRBUF_INIT;
687 strbuf_addstr(&sb, tr->string);
688 strbuf_trim(&sb);
689 error(_("empty trailer token in trailer '%.*s'"),
690 (int) sb.len, sb.buf);
691 strbuf_release(&sb);
692 } else {
693 parse_trailer(&tok, &val, &conf, tr->string,
694 separator_pos);
695 add_arg_item(arg_head,
696 strbuf_detach(&tok, NULL),
697 strbuf_detach(&val, NULL),
698 conf);
699 }
700 }
701
702 free(cl_separators);
703}
704
705static void read_input_file(struct strbuf *sb, const char *file)
706{
707 if (file) {
708 if (strbuf_read_file(sb, file, 0) < 0)
709 die_errno(_("could not read input file '%s'"), file);
710 } else {
711 if (strbuf_read(sb, fileno(stdin), 0) < 0)
712 die_errno(_("could not read from stdin"));
713 }
714}
715
716static const char *next_line(const char *str)
717{
718 const char *nl = strchrnul(str, '\n');
719 return nl + !!*nl;
720}
721
722/*
723 * Return the position of the start of the last line. If len is 0, return -1.
724 */
725static int last_line(const char *buf, size_t len)
726{
727 int i;
728 if (len == 0)
729 return -1;
730 if (len == 1)
731 return 0;
732 /*
733 * Skip the last character (in addition to the null terminator),
734 * because if the last character is a newline, it is considered as part
735 * of the last line anyway.
736 */
737 i = len - 2;
738
739 for (; i >= 0; i--) {
740 if (buf[i] == '\n')
741 return i + 1;
742 }
743 return 0;
744}
745
746/*
747 * Return the position of the start of the patch or the length of str if there
748 * is no patch in the message.
749 */
750static int find_patch_start(const char *str)
751{
752 const char *s;
753
754 for (s = str; *s; s = next_line(s)) {
755 if (starts_with(s, "---"))
756 return s - str;
757 }
758
759 return s - str;
760}
761
762/*
763 * Return the position of the first trailer line or len if there are no
764 * trailers.
765 */
766static int find_trailer_start(const char *buf, size_t len)
767{
768 const char *s;
769 int end_of_title, l, only_spaces = 1;
770 int recognized_prefix = 0, trailer_lines = 0, non_trailer_lines = 0;
771 /*
772 * Number of possible continuation lines encountered. This will be
773 * reset to 0 if we encounter a trailer (since those lines are to be
774 * considered continuations of that trailer), and added to
775 * non_trailer_lines if we encounter a non-trailer (since those lines
776 * are to be considered non-trailers).
777 */
778 int possible_continuation_lines = 0;
779
780 /* The first paragraph is the title and cannot be trailers */
781 for (s = buf; s < buf + len; s = next_line(s)) {
782 if (s[0] == comment_line_char)
783 continue;
784 if (is_blank_line(s))
785 break;
786 }
787 end_of_title = s - buf;
788
789 /*
790 * Get the start of the trailers by looking starting from the end for a
791 * blank line before a set of non-blank lines that (i) are all
792 * trailers, or (ii) contains at least one Git-generated trailer and
793 * consists of at least 25% trailers.
794 */
795 for (l = last_line(buf, len);
796 l >= end_of_title;
797 l = last_line(buf, l)) {
798 const char *bol = buf + l;
799 const char **p;
800 int separator_pos;
801
802 if (bol[0] == comment_line_char) {
803 non_trailer_lines += possible_continuation_lines;
804 possible_continuation_lines = 0;
805 continue;
806 }
807 if (is_blank_line(bol)) {
808 if (only_spaces)
809 continue;
810 non_trailer_lines += possible_continuation_lines;
811 if (recognized_prefix &&
812 trailer_lines * 3 >= non_trailer_lines)
813 return next_line(bol) - buf;
814 else if (trailer_lines && !non_trailer_lines)
815 return next_line(bol) - buf;
816 return len;
817 }
818 only_spaces = 0;
819
820 for (p = git_generated_prefixes; *p; p++) {
821 if (starts_with(bol, *p)) {
822 trailer_lines++;
823 possible_continuation_lines = 0;
824 recognized_prefix = 1;
825 goto continue_outer_loop;
826 }
827 }
828
829 separator_pos = find_separator(bol, separators);
830 if (separator_pos >= 1 && !isspace(bol[0])) {
831 struct list_head *pos;
832
833 trailer_lines++;
834 possible_continuation_lines = 0;
835 if (recognized_prefix)
836 continue;
837 list_for_each(pos, &conf_head) {
838 struct arg_item *item;
839 item = list_entry(pos, struct arg_item, list);
840 if (token_matches_item(bol, item,
841 separator_pos)) {
842 recognized_prefix = 1;
843 break;
844 }
845 }
846 } else if (isspace(bol[0]))
847 possible_continuation_lines++;
848 else {
849 non_trailer_lines++;
850 non_trailer_lines += possible_continuation_lines;
851 possible_continuation_lines = 0;
852 }
853continue_outer_loop:
854 ;
855 }
856
857 return len;
858}
859
860/* Return the position of the end of the trailers. */
861static int find_trailer_end(const char *buf, size_t len)
862{
863 return len - ignore_non_trailer(buf, len);
864}
865
866static int ends_with_blank_line(const char *buf, size_t len)
867{
868 int ll = last_line(buf, len);
869 if (ll < 0)
870 return 0;
871 return is_blank_line(buf + ll);
872}
873
874static int process_input_file(FILE *outfile,
875 const char *str,
876 struct list_head *head)
877{
878 int patch_start, trailer_start, trailer_end;
879 struct strbuf tok = STRBUF_INIT;
880 struct strbuf val = STRBUF_INIT;
881 struct trailer_item *last = NULL;
882 struct strbuf *trailer, **trailer_lines, **ptr;
883
884 patch_start = find_patch_start(str);
885 trailer_end = find_trailer_end(str, patch_start);
886 trailer_start = find_trailer_start(str, trailer_end);
887
888 /* Print lines before the trailers as is */
889 fwrite(str, 1, trailer_start, outfile);
890
891 if (!ends_with_blank_line(str, trailer_start))
892 fprintf(outfile, "\n");
893
894 /* Parse trailer lines */
895 trailer_lines = strbuf_split_buf(str + trailer_start,
896 trailer_end - trailer_start,
897 '\n',
898 0);
899 for (ptr = trailer_lines; *ptr; ptr++) {
900 int separator_pos;
901 trailer = *ptr;
902 if (trailer->buf[0] == comment_line_char)
903 continue;
904 if (last && isspace(trailer->buf[0])) {
905 struct strbuf sb = STRBUF_INIT;
906 strbuf_addf(&sb, "%s\n%s", last->value, trailer->buf);
907 strbuf_strip_suffix(&sb, "\n");
908 free(last->value);
909 last->value = strbuf_detach(&sb, NULL);
910 continue;
911 }
912 separator_pos = find_separator(trailer->buf, separators);
913 if (separator_pos >= 1) {
914 parse_trailer(&tok, &val, NULL, trailer->buf,
915 separator_pos);
916 last = add_trailer_item(head,
917 strbuf_detach(&tok, NULL),
918 strbuf_detach(&val, NULL));
919 } else {
920 strbuf_addbuf(&val, trailer);
921 strbuf_strip_suffix(&val, "\n");
922 add_trailer_item(head,
923 NULL,
924 strbuf_detach(&val, NULL));
925 last = NULL;
926 }
927 }
928 strbuf_list_free(trailer_lines);
929
930 return trailer_end;
931}
932
933static void free_all(struct list_head *head)
934{
935 struct list_head *pos, *p;
936 list_for_each_safe(pos, p, head) {
937 list_del(pos);
938 free_trailer_item(list_entry(pos, struct trailer_item, list));
939 }
940}
941
942static struct tempfile trailers_tempfile;
943
944static FILE *create_in_place_tempfile(const char *file)
945{
946 struct stat st;
947 struct strbuf template = STRBUF_INIT;
948 const char *tail;
949 FILE *outfile;
950
951 if (stat(file, &st))
952 die_errno(_("could not stat %s"), file);
953 if (!S_ISREG(st.st_mode))
954 die(_("file %s is not a regular file"), file);
955 if (!(st.st_mode & S_IWUSR))
956 die(_("file %s is not writable by user"), file);
957
958 /* Create temporary file in the same directory as the original */
959 tail = strrchr(file, '/');
960 if (tail != NULL)
961 strbuf_add(&template, file, tail - file + 1);
962 strbuf_addstr(&template, "git-interpret-trailers-XXXXXX");
963
964 xmks_tempfile_m(&trailers_tempfile, template.buf, st.st_mode);
965 strbuf_release(&template);
966 outfile = fdopen_tempfile(&trailers_tempfile, "w");
967 if (!outfile)
968 die_errno(_("could not open temporary file"));
969
970 return outfile;
971}
972
973void process_trailers(const char *file, int in_place, int trim_empty, struct string_list *trailers)
974{
975 LIST_HEAD(head);
976 LIST_HEAD(arg_head);
977 struct strbuf sb = STRBUF_INIT;
978 int trailer_end;
979 FILE *outfile = stdout;
980
981 /* Default config must be setup first */
982 git_config(git_trailer_default_config, NULL);
983 git_config(git_trailer_config, NULL);
984
985 read_input_file(&sb, file);
986
987 if (in_place)
988 outfile = create_in_place_tempfile(file);
989
990 /* Print the lines before the trailers */
991 trailer_end = process_input_file(outfile, sb.buf, &head);
992
993 process_command_line_args(&arg_head, trailers);
994
995 process_trailers_lists(&head, &arg_head);
996
997 print_all(outfile, &head, trim_empty);
998
999 free_all(&head);
1000
1001 /* Print the lines after the trailers as is */
1002 fwrite(sb.buf + trailer_end, 1, sb.len - trailer_end, outfile);
1003
1004 if (in_place)
1005 if (rename_tempfile(&trailers_tempfile, file))
1006 die_errno(_("could not rename temporary file to %s"), file);
1007
1008 strbuf_release(&sb);
1009}