?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
prefix_filename: return newly allocated string
[git/debian.git] / ref-filter.c
blob9c82b5b9d632bbbe66332b6c54badb5bc88d28d8
1 #include "builtin.h"
2 #include "cache.h"
3 #include "parse-options.h"
4 #include "refs.h"
5 #include "wildmatch.h"
6 #include "commit.h"
7 #include "remote.h"
8 #include "color.h"
9 #include "tag.h"
10 #include "quote.h"
11 #include "ref-filter.h"
12 #include "revision.h"
13 #include "utf8.h"
14 #include "git-compat-util.h"
15 #include "version.h"
16 #include "trailer.h"
17 #include "wt-status.h"
18 #include "commit-slab.h"
19
20 static struct ref_msg {
21 const char *gone;
22 const char *ahead;
23 const char *behind;
24 const char *ahead_behind;
25 } msgs = {
26 /* Untranslated plumbing messages: */
27 "gone",
28 "ahead %d",
29 "behind %d",
30 "ahead %d, behind %d"
31 };
32
33 void setup_ref_filter_porcelain_msg(void)
34 {
35 msgs.gone = _("gone");
36 msgs.ahead = _("ahead %d");
37 msgs.behind = _("behind %d");
38 msgs.ahead_behind = _("ahead %d, behind %d");
39 }
40
41 typedef enum { FIELD_STR, FIELD_ULONG, FIELD_TIME } cmp_type;
42 typedef enum { COMPARE_EQUAL, COMPARE_UNEQUAL, COMPARE_NONE } cmp_status;
43
44 struct align {
45 align_type position;
46 unsigned int width;
47 };
48
49 struct if_then_else {
50 cmp_status cmp_status;
51 const char *str;
52 unsigned int then_atom_seen : 1,
53 else_atom_seen : 1,
54 condition_satisfied : 1;
55 };
56
57 struct refname_atom {
58 enum { R_NORMAL, R_SHORT, R_LSTRIP, R_RSTRIP } option;
59 int lstrip, rstrip;
60 };
61
62 /*
63 * An atom is a valid field atom listed below, possibly prefixed with
64 * a "*" to denote deref_tag().
65 *
66 * We parse given format string and sort specifiers, and make a list
67 * of properties that we need to extract out of objects. ref_array_item
68 * structure will hold an array of values extracted that can be
69 * indexed with the "atom number", which is an index into this
70 * array.
71 */
72 static struct used_atom {
73 const char *name;
74 cmp_type type;
75 union {
76 char color[COLOR_MAXLEN];
77 struct align align;
78 struct {
79 enum { RR_REF, RR_TRACK, RR_TRACKSHORT } option;
80 struct refname_atom refname;
81 unsigned int nobracket : 1;
82 } remote_ref;
83 struct {
84 enum { C_BARE, C_BODY, C_BODY_DEP, C_LINES, C_SIG, C_SUB, C_TRAILERS } option;
85 unsigned int nlines;
86 } contents;
87 struct {
88 cmp_status cmp_status;
89 const char *str;
90 } if_then_else;
91 struct {
92 enum { O_FULL, O_LENGTH, O_SHORT } option;
93 unsigned int length;
94 } objectname;
95 struct refname_atom refname;
96 } u;
97 } *used_atom;
98 static int used_atom_cnt, need_tagged, need_symref;
99 static int need_color_reset_at_eol;
100
101 static void color_atom_parser(struct used_atom *atom, const char *color_value)
102 {
103 if (!color_value)
104 die(_("expected format: %%(color:<color>)"));
105 if (color_parse(color_value, atom->u.color) < 0)
106 die(_("unrecognized color: %%(color:%s)"), color_value);
107 }
108
109 static void refname_atom_parser_internal(struct refname_atom *atom,
110 const char *arg, const char *name)
111 {
112 if (!arg)
113 atom->option = R_NORMAL;
114 else if (!strcmp(arg, "short"))
115 atom->option = R_SHORT;
116 else if (skip_prefix(arg, "lstrip=", &arg) ||
117 skip_prefix(arg, "strip=", &arg)) {
118 atom->option = R_LSTRIP;
119 if (strtol_i(arg, 10, &atom->lstrip))
120 die(_("Integer value expected refname:lstrip=%s"), arg);
121 } else if (skip_prefix(arg, "rstrip=", &arg)) {
122 atom->option = R_RSTRIP;
123 if (strtol_i(arg, 10, &atom->rstrip))
124 die(_("Integer value expected refname:rstrip=%s"), arg);
125 } else
126 die(_("unrecognized %%(%s) argument: %s"), name, arg);
127 }
128
129 static void remote_ref_atom_parser(struct used_atom *atom, const char *arg)
130 {
131 struct string_list params = STRING_LIST_INIT_DUP;
132 int i;
133
134 if (!arg) {
135 atom->u.remote_ref.option = RR_REF;
136 refname_atom_parser_internal(&atom->u.remote_ref.refname,
137 arg, atom->name);
138 return;
139 }
140
141 atom->u.remote_ref.nobracket = 0;
142 string_list_split(&params, arg, ',', -1);
143
144 for (i = 0; i < params.nr; i++) {
145 const char *s = params.items[i].string;
146
147 if (!strcmp(s, "track"))
148 atom->u.remote_ref.option = RR_TRACK;
149 else if (!strcmp(s, "trackshort"))
150 atom->u.remote_ref.option = RR_TRACKSHORT;
151 else if (!strcmp(s, "nobracket"))
152 atom->u.remote_ref.nobracket = 1;
153 else {
154 atom->u.remote_ref.option = RR_REF;
155 refname_atom_parser_internal(&atom->u.remote_ref.refname,
156 arg, atom->name);
157 }
158 }
159
160 string_list_clear(&params, 0);
161 }
162
163 static void body_atom_parser(struct used_atom *atom, const char *arg)
164 {
165 if (arg)
166 die(_("%%(body) does not take arguments"));
167 atom->u.contents.option = C_BODY_DEP;
168 }
169
170 static void subject_atom_parser(struct used_atom *atom, const char *arg)
171 {
172 if (arg)
173 die(_("%%(subject) does not take arguments"));
174 atom->u.contents.option = C_SUB;
175 }
176
177 static void trailers_atom_parser(struct used_atom *atom, const char *arg)
178 {
179 if (arg)
180 die(_("%%(trailers) does not take arguments"));
181 atom->u.contents.option = C_TRAILERS;
182 }
183
184 static void contents_atom_parser(struct used_atom *atom, const char *arg)
185 {
186 if (!arg)
187 atom->u.contents.option = C_BARE;
188 else if (!strcmp(arg, "body"))
189 atom->u.contents.option = C_BODY;
190 else if (!strcmp(arg, "signature"))
191 atom->u.contents.option = C_SIG;
192 else if (!strcmp(arg, "subject"))
193 atom->u.contents.option = C_SUB;
194 else if (!strcmp(arg, "trailers"))
195 atom->u.contents.option = C_TRAILERS;
196 else if (skip_prefix(arg, "lines=", &arg)) {
197 atom->u.contents.option = C_LINES;
198 if (strtoul_ui(arg, 10, &atom->u.contents.nlines))
199 die(_("positive value expected contents:lines=%s"), arg);
200 } else
201 die(_("unrecognized %%(contents) argument: %s"), arg);
202 }
203
204 static void objectname_atom_parser(struct used_atom *atom, const char *arg)
205 {
206 if (!arg)
207 atom->u.objectname.option = O_FULL;
208 else if (!strcmp(arg, "short"))
209 atom->u.objectname.option = O_SHORT;
210 else if (skip_prefix(arg, "short=", &arg)) {
211 atom->u.objectname.option = O_LENGTH;
212 if (strtoul_ui(arg, 10, &atom->u.objectname.length) ||
213 atom->u.objectname.length == 0)
214 die(_("positive value expected objectname:short=%s"), arg);
215 if (atom->u.objectname.length < MINIMUM_ABBREV)
216 atom->u.objectname.length = MINIMUM_ABBREV;
217 } else
218 die(_("unrecognized %%(objectname) argument: %s"), arg);
219 }
220
221 static void refname_atom_parser(struct used_atom *atom, const char *arg)
222 {
223 return refname_atom_parser_internal(&atom->u.refname, arg, atom->name);
224 }
225
226 static align_type parse_align_position(const char *s)
227 {
228 if (!strcmp(s, "right"))
229 return ALIGN_RIGHT;
230 else if (!strcmp(s, "middle"))
231 return ALIGN_MIDDLE;
232 else if (!strcmp(s, "left"))
233 return ALIGN_LEFT;
234 return -1;
235 }
236
237 static void align_atom_parser(struct used_atom *atom, const char *arg)
238 {
239 struct align *align = &atom->u.align;
240 struct string_list params = STRING_LIST_INIT_DUP;
241 int i;
242 unsigned int width = ~0U;
243
244 if (!arg)
245 die(_("expected format: %%(align:<width>,<position>)"));
246
247 align->position = ALIGN_LEFT;
248
249 string_list_split(&params, arg, ',', -1);
250 for (i = 0; i < params.nr; i++) {
251 const char *s = params.items[i].string;
252 int position;
253
254 if (skip_prefix(s, "position=", &s)) {
255 position = parse_align_position(s);
256 if (position < 0)
257 die(_("unrecognized position:%s"), s);
258 align->position = position;
259 } else if (skip_prefix(s, "width=", &s)) {
260 if (strtoul_ui(s, 10, &width))
261 die(_("unrecognized width:%s"), s);
262 } else if (!strtoul_ui(s, 10, &width))
263 ;
264 else if ((position = parse_align_position(s)) >= 0)
265 align->position = position;
266 else
267 die(_("unrecognized %%(align) argument: %s"), s);
268 }
269
270 if (width == ~0U)
271 die(_("positive width expected with the %%(align) atom"));
272 align->width = width;
273 string_list_clear(&params, 0);
274 }
275
276 static void if_atom_parser(struct used_atom *atom, const char *arg)
277 {
278 if (!arg) {
279 atom->u.if_then_else.cmp_status = COMPARE_NONE;
280 return;
281 } else if (skip_prefix(arg, "equals=", &atom->u.if_then_else.str)) {
282 atom->u.if_then_else.cmp_status = COMPARE_EQUAL;
283 } else if (skip_prefix(arg, "notequals=", &atom->u.if_then_else.str)) {
284 atom->u.if_then_else.cmp_status = COMPARE_UNEQUAL;
285 } else {
286 die(_("unrecognized %%(if) argument: %s"), arg);
287 }
288 }
289
290
291 static struct {
292 const char *name;
293 cmp_type cmp_type;
294 void (*parser)(struct used_atom *atom, const char *arg);
295 } valid_atom[] = {
296 { "refname" , FIELD_STR, refname_atom_parser },
297 { "objecttype" },
298 { "objectsize", FIELD_ULONG },
299 { "objectname", FIELD_STR, objectname_atom_parser },
300 { "tree" },
301 { "parent" },
302 { "numparent", FIELD_ULONG },
303 { "object" },
304 { "type" },
305 { "tag" },
306 { "author" },
307 { "authorname" },
308 { "authoremail" },
309 { "authordate", FIELD_TIME },
310 { "committer" },
311 { "committername" },
312 { "committeremail" },
313 { "committerdate", FIELD_TIME },
314 { "tagger" },
315 { "taggername" },
316 { "taggeremail" },
317 { "taggerdate", FIELD_TIME },
318 { "creator" },
319 { "creatordate", FIELD_TIME },
320 { "subject", FIELD_STR, subject_atom_parser },
321 { "body", FIELD_STR, body_atom_parser },
322 { "trailers", FIELD_STR, trailers_atom_parser },
323 { "contents", FIELD_STR, contents_atom_parser },
324 { "upstream", FIELD_STR, remote_ref_atom_parser },
325 { "push", FIELD_STR, remote_ref_atom_parser },
326 { "symref", FIELD_STR, refname_atom_parser },
327 { "flag" },
328 { "HEAD" },
329 { "color", FIELD_STR, color_atom_parser },
330 { "align", FIELD_STR, align_atom_parser },
331 { "end" },
332 { "if", FIELD_STR, if_atom_parser },
333 { "then" },
334 { "else" },
335 };
336
337 #define REF_FORMATTING_STATE_INIT { 0, NULL }
338
339 struct ref_formatting_stack {
340 struct ref_formatting_stack *prev;
341 struct strbuf output;
342 void (*at_end)(struct ref_formatting_stack **stack);
343 void *at_end_data;
344 };
345
346 struct ref_formatting_state {
347 int quote_style;
348 struct ref_formatting_stack *stack;
349 };
350
351 struct atom_value {
352 const char *s;
353 void (*handler)(struct atom_value *atomv, struct ref_formatting_state *state);
354 unsigned long ul; /* used for sorting when not FIELD_STR */
355 struct used_atom *atom;
356 };
357
358 /*
359 * Used to parse format string and sort specifiers
360 */
361 int parse_ref_filter_atom(const char *atom, const char *ep)
362 {
363 const char *sp;
364 const char *arg;
365 int i, at, atom_len;
366
367 sp = atom;
368 if (*sp == '*' && sp < ep)
369 sp++; /* deref */
370 if (ep <= sp)
371 die(_("malformed field name: %.*s"), (int)(ep-atom), atom);
372
373 /* Do we have the atom already used elsewhere? */
374 for (i = 0; i < used_atom_cnt; i++) {
375 int len = strlen(used_atom[i].name);
376 if (len == ep - atom && !memcmp(used_atom[i].name, atom, len))
377 return i;
378 }
379
380 /*
381 * If the atom name has a colon, strip it and everything after
382 * it off - it specifies the format for this entry, and
383 * shouldn't be used for checking against the valid_atom
384 * table.
385 */
386 arg = memchr(sp, ':', ep - sp);
387 atom_len = (arg ? arg : ep) - sp;
388
389 /* Is the atom a valid one? */
390 for (i = 0; i < ARRAY_SIZE(valid_atom); i++) {
391 int len = strlen(valid_atom[i].name);
392 if (len == atom_len && !memcmp(valid_atom[i].name, sp, len))
393 break;
394 }
395
396 if (ARRAY_SIZE(valid_atom) <= i)
397 die(_("unknown field name: %.*s"), (int)(ep-atom), atom);
398
399 /* Add it in, including the deref prefix */
400 at = used_atom_cnt;
401 used_atom_cnt++;
402 REALLOC_ARRAY(used_atom, used_atom_cnt);
403 used_atom[at].name = xmemdupz(atom, ep - atom);
404 used_atom[at].type = valid_atom[i].cmp_type;
405 if (arg)
406 arg = used_atom[at].name + (arg - atom) + 1;
407 memset(&used_atom[at].u, 0, sizeof(used_atom[at].u));
408 if (valid_atom[i].parser)
409 valid_atom[i].parser(&used_atom[at], arg);
410 if (*atom == '*')
411 need_tagged = 1;
412 if (!strcmp(valid_atom[i].name, "symref"))
413 need_symref = 1;
414 return at;
415 }
416
417 static void quote_formatting(struct strbuf *s, const char *str, int quote_style)
418 {
419 switch (quote_style) {
420 case QUOTE_NONE:
421 strbuf_addstr(s, str);
422 break;
423 case QUOTE_SHELL:
424 sq_quote_buf(s, str);
425 break;
426 case QUOTE_PERL:
427 perl_quote_buf(s, str);
428 break;
429 case QUOTE_PYTHON:
430 python_quote_buf(s, str);
431 break;
432 case QUOTE_TCL:
433 tcl_quote_buf(s, str);
434 break;
435 }
436 }
437
438 static void append_atom(struct atom_value *v, struct ref_formatting_state *state)
439 {
440 /*
441 * Quote formatting is only done when the stack has a single
442 * element. Otherwise quote formatting is done on the
443 * element's entire output strbuf when the %(end) atom is
444 * encountered.
445 */
446 if (!state->stack->prev)
447 quote_formatting(&state->stack->output, v->s, state->quote_style);
448 else
449 strbuf_addstr(&state->stack->output, v->s);
450 }
451
452 static void push_stack_element(struct ref_formatting_stack **stack)
453 {
454 struct ref_formatting_stack *s = xcalloc(1, sizeof(struct ref_formatting_stack));
455
456 strbuf_init(&s->output, 0);
457 s->prev = *stack;
458 *stack = s;
459 }
460
461 static void pop_stack_element(struct ref_formatting_stack **stack)
462 {
463 struct ref_formatting_stack *current = *stack;
464 struct ref_formatting_stack *prev = current->prev;
465
466 if (prev)
467 strbuf_addbuf(&prev->output, &current->output);
468 strbuf_release(&current->output);
469 free(current);
470 *stack = prev;
471 }
472
473 static void end_align_handler(struct ref_formatting_stack **stack)
474 {
475 struct ref_formatting_stack *cur = *stack;
476 struct align *align = (struct align *)cur->at_end_data;
477 struct strbuf s = STRBUF_INIT;
478
479 strbuf_utf8_align(&s, align->position, align->width, cur->output.buf);
480 strbuf_swap(&cur->output, &s);
481 strbuf_release(&s);
482 }
483
484 static void align_atom_handler(struct atom_value *atomv, struct ref_formatting_state *state)
485 {
486 struct ref_formatting_stack *new;
487
488 push_stack_element(&state->stack);
489 new = state->stack;
490 new->at_end = end_align_handler;
491 new->at_end_data = &atomv->atom->u.align;
492 }
493
494 static void if_then_else_handler(struct ref_formatting_stack **stack)
495 {
496 struct ref_formatting_stack *cur = *stack;
497 struct ref_formatting_stack *prev = cur->prev;
498 struct if_then_else *if_then_else = (struct if_then_else *)cur->at_end_data;
499
500 if (!if_then_else->then_atom_seen)
501 die(_("format: %%(if) atom used without a %%(then) atom"));
502
503 if (if_then_else->else_atom_seen) {
504 /*
505 * There is an %(else) atom: we need to drop one state from the
506 * stack, either the %(else) branch if the condition is satisfied, or
507 * the %(then) branch if it isn't.
508 */
509 if (if_then_else->condition_satisfied) {
510 strbuf_reset(&cur->output);
511 pop_stack_element(&cur);
512 } else {
513 strbuf_swap(&cur->output, &prev->output);
514 strbuf_reset(&cur->output);
515 pop_stack_element(&cur);
516 }
517 } else if (!if_then_else->condition_satisfied) {
518 /*
519 * No %(else) atom: just drop the %(then) branch if the
520 * condition is not satisfied.
521 */
522 strbuf_reset(&cur->output);
523 }
524
525 *stack = cur;
526 free(if_then_else);
527 }
528
529 static void if_atom_handler(struct atom_value *atomv, struct ref_formatting_state *state)
530 {
531 struct ref_formatting_stack *new;
532 struct if_then_else *if_then_else = xcalloc(sizeof(struct if_then_else), 1);
533
534 if_then_else->str = atomv->atom->u.if_then_else.str;
535 if_then_else->cmp_status = atomv->atom->u.if_then_else.cmp_status;
536
537 push_stack_element(&state->stack);
538 new = state->stack;
539 new->at_end = if_then_else_handler;
540 new->at_end_data = if_then_else;
541 }
542
543 static int is_empty(const char *s)
544 {
545 while (*s != '\0') {
546 if (!isspace(*s))
547 return 0;
548 s++;
549 }
550 return 1;
551 }
552
553 static void then_atom_handler(struct atom_value *atomv, struct ref_formatting_state *state)
554 {
555 struct ref_formatting_stack *cur = state->stack;
556 struct if_then_else *if_then_else = NULL;
557
558 if (cur->at_end == if_then_else_handler)
559 if_then_else = (struct if_then_else *)cur->at_end_data;
560 if (!if_then_else)
561 die(_("format: %%(then) atom used without an %%(if) atom"));
562 if (if_then_else->then_atom_seen)
563 die(_("format: %%(then) atom used more than once"));
564 if (if_then_else->else_atom_seen)
565 die(_("format: %%(then) atom used after %%(else)"));
566 if_then_else->then_atom_seen = 1;
567 /*
568 * If the 'equals' or 'notequals' attribute is used then
569 * perform the required comparison. If not, only non-empty
570 * strings satisfy the 'if' condition.
571 */
572 if (if_then_else->cmp_status == COMPARE_EQUAL) {
573 if (!strcmp(if_then_else->str, cur->output.buf))
574 if_then_else->condition_satisfied = 1;
575 } else if (if_then_else->cmp_status == COMPARE_UNEQUAL) {
576 if (strcmp(if_then_else->str, cur->output.buf))
577 if_then_else->condition_satisfied = 1;
578 } else if (cur->output.len && !is_empty(cur->output.buf))
579 if_then_else->condition_satisfied = 1;
580 strbuf_reset(&cur->output);
581 }
582
583 static void else_atom_handler(struct atom_value *atomv, struct ref_formatting_state *state)
584 {
585 struct ref_formatting_stack *prev = state->stack;
586 struct if_then_else *if_then_else = NULL;
587
588 if (prev->at_end == if_then_else_handler)
589 if_then_else = (struct if_then_else *)prev->at_end_data;
590 if (!if_then_else)
591 die(_("format: %%(else) atom used without an %%(if) atom"));
592 if (!if_then_else->then_atom_seen)
593 die(_("format: %%(else) atom used without a %%(then) atom"));
594 if (if_then_else->else_atom_seen)
595 die(_("format: %%(else) atom used more than once"));
596 if_then_else->else_atom_seen = 1;
597 push_stack_element(&state->stack);
598 state->stack->at_end_data = prev->at_end_data;
599 state->stack->at_end = prev->at_end;
600 }
601
602 static void end_atom_handler(struct atom_value *atomv, struct ref_formatting_state *state)
603 {
604 struct ref_formatting_stack *current = state->stack;
605 struct strbuf s = STRBUF_INIT;
606
607 if (!current->at_end)
608 die(_("format: %%(end) atom used without corresponding atom"));
609 current->at_end(&state->stack);
610
611 /* Stack may have been popped within at_end(), hence reset the current pointer */
612 current = state->stack;
613
614 /*
615 * Perform quote formatting when the stack element is that of
616 * a supporting atom. If nested then perform quote formatting
617 * only on the topmost supporting atom.
618 */
619 if (!current->prev->prev) {
620 quote_formatting(&s, current->output.buf, state->quote_style);
621 strbuf_swap(&current->output, &s);
622 }
623 strbuf_release(&s);
624 pop_stack_element(&state->stack);
625 }
626
627 /*
628 * In a format string, find the next occurrence of %(atom).
629 */
630 static const char *find_next(const char *cp)
631 {
632 while (*cp) {
633 if (*cp == '%') {
634 /*
635 * %( is the start of an atom;
636 * %% is a quoted per-cent.
637 */
638 if (cp[1] == '(')
639 return cp;
640 else if (cp[1] == '%')
641 cp++; /* skip over two % */
642 /* otherwise this is a singleton, literal % */
643 }
644 cp++;
645 }
646 return NULL;
647 }
648
649 /*
650 * Make sure the format string is well formed, and parse out
651 * the used atoms.
652 */
653 int verify_ref_format(const char *format)
654 {
655 const char *cp, *sp;
656
657 need_color_reset_at_eol = 0;
658 for (cp = format; *cp && (sp = find_next(cp)); ) {
659 const char *color, *ep = strchr(sp, ')');
660 int at;
661
662 if (!ep)
663 return error(_("malformed format string %s"), sp);
664 /* sp points at "%(" and ep points at the closing ")" */
665 at = parse_ref_filter_atom(sp + 2, ep);
666 cp = ep + 1;
667
668 if (skip_prefix(used_atom[at].name, "color:", &color))
669 need_color_reset_at_eol = !!strcmp(color, "reset");
670 }
671 return 0;
672 }
673
674 /*
675 * Given an object name, read the object data and size, and return a
676 * "struct object". If the object data we are returning is also borrowed
677 * by the "struct object" representation, set *eaten as well---it is a
678 * signal from parse_object_buffer to us not to free the buffer.
679 */
680 static void *get_obj(const unsigned char *sha1, struct object **obj, unsigned long *sz, int *eaten)
681 {
682 enum object_type type;
683 void *buf = read_sha1_file(sha1, &type, sz);
684
685 if (buf)
686 *obj = parse_object_buffer(sha1, type, *sz, buf, eaten);
687 else
688 *obj = NULL;
689 return buf;
690 }
691
692 static int grab_objectname(const char *name, const unsigned char *sha1,
693 struct atom_value *v, struct used_atom *atom)
694 {
695 if (starts_with(name, "objectname")) {
696 if (atom->u.objectname.option == O_SHORT) {
697 v->s = xstrdup(find_unique_abbrev(sha1, DEFAULT_ABBREV));
698 return 1;
699 } else if (atom->u.objectname.option == O_FULL) {
700 v->s = xstrdup(sha1_to_hex(sha1));
701 return 1;
702 } else if (atom->u.objectname.option == O_LENGTH) {
703 v->s = xstrdup(find_unique_abbrev(sha1, atom->u.objectname.length));
704 return 1;
705 } else
706 die("BUG: unknown %%(objectname) option");
707 }
708 return 0;
709 }
710
711 /* See grab_values */
712 static void grab_common_values(struct atom_value *val, int deref, struct object *obj, void *buf, unsigned long sz)
713 {
714 int i;
715
716 for (i = 0; i < used_atom_cnt; i++) {
717 const char *name = used_atom[i].name;
718 struct atom_value *v = &val[i];
719 if (!!deref != (*name == '*'))
720 continue;
721 if (deref)
722 name++;
723 if (!strcmp(name, "objecttype"))
724 v->s = typename(obj->type);
725 else if (!strcmp(name, "objectsize")) {
726 v->ul = sz;
727 v->s = xstrfmt("%lu", sz);
728 }
729 else if (deref)
730 grab_objectname(name, obj->oid.hash, v, &used_atom[i]);
731 }
732 }
733
734 /* See grab_values */
735 static void grab_tag_values(struct atom_value *val, int deref, struct object *obj, void *buf, unsigned long sz)
736 {
737 int i;
738 struct tag *tag = (struct tag *) obj;
739
740 for (i = 0; i < used_atom_cnt; i++) {
741 const char *name = used_atom[i].name;
742 struct atom_value *v = &val[i];
743 if (!!deref != (*name == '*'))
744 continue;
745 if (deref)
746 name++;
747 if (!strcmp(name, "tag"))
748 v->s = tag->tag;
749 else if (!strcmp(name, "type") && tag->tagged)
750 v->s = typename(tag->tagged->type);
751 else if (!strcmp(name, "object") && tag->tagged)
752 v->s = xstrdup(oid_to_hex(&tag->tagged->oid));
753 }
754 }
755
756 /* See grab_values */
757 static void grab_commit_values(struct atom_value *val, int deref, struct object *obj, void *buf, unsigned long sz)
758 {
759 int i;
760 struct commit *commit = (struct commit *) obj;
761
762 for (i = 0; i < used_atom_cnt; i++) {
763 const char *name = used_atom[i].name;
764 struct atom_value *v = &val[i];
765 if (!!deref != (*name == '*'))
766 continue;
767 if (deref)
768 name++;
769 if (!strcmp(name, "tree")) {
770 v->s = xstrdup(oid_to_hex(&commit->tree->object.oid));
771 }
772 else if (!strcmp(name, "numparent")) {
773 v->ul = commit_list_count(commit->parents);
774 v->s = xstrfmt("%lu", v->ul);
775 }
776 else if (!strcmp(name, "parent")) {
777 struct commit_list *parents;
778 struct strbuf s = STRBUF_INIT;
779 for (parents = commit->parents; parents; parents = parents->next) {
780 struct commit *parent = parents->item;
781 if (parents != commit->parents)
782 strbuf_addch(&s, ' ');
783 strbuf_addstr(&s, oid_to_hex(&parent->object.oid));
784 }
785 v->s = strbuf_detach(&s, NULL);
786 }
787 }
788 }
789
790 static const char *find_wholine(const char *who, int wholen, const char *buf, unsigned long sz)
791 {
792 const char *eol;
793 while (*buf) {
794 if (!strncmp(buf, who, wholen) &&
795 buf[wholen] == ' ')
796 return buf + wholen + 1;
797 eol = strchr(buf, '\n');
798 if (!eol)
799 return "";
800 eol++;
801 if (*eol == '\n')
802 return ""; /* end of header */
803 buf = eol;
804 }
805 return "";
806 }
807
808 static const char *copy_line(const char *buf)
809 {
810 const char *eol = strchrnul(buf, '\n');
811 return xmemdupz(buf, eol - buf);
812 }
813
814 static const char *copy_name(const char *buf)
815 {
816 const char *cp;
817 for (cp = buf; *cp && *cp != '\n'; cp++) {
818 if (!strncmp(cp, " <", 2))
819 return xmemdupz(buf, cp - buf);
820 }
821 return "";
822 }
823
824 static const char *copy_email(const char *buf)
825 {
826 const char *email = strchr(buf, '<');
827 const char *eoemail;
828 if (!email)
829 return "";
830 eoemail = strchr(email, '>');
831 if (!eoemail)
832 return "";
833 return xmemdupz(email, eoemail + 1 - email);
834 }
835
836 static char *copy_subject(const char *buf, unsigned long len)
837 {
838 char *r = xmemdupz(buf, len);
839 int i;
840
841 for (i = 0; i < len; i++)
842 if (r[i] == '\n')
843 r[i] = ' ';
844
845 return r;
846 }
847
848 static void grab_date(const char *buf, struct atom_value *v, const char *atomname)
849 {
850 const char *eoemail = strstr(buf, "> ");
851 char *zone;
852 unsigned long timestamp;
853 long tz;
854 struct date_mode date_mode = { DATE_NORMAL };
855 const char *formatp;
856
857 /*
858 * We got here because atomname ends in "date" or "date<something>";
859 * it's not possible that <something> is not ":<format>" because
860 * parse_ref_filter_atom() wouldn't have allowed it, so we can assume that no
861 * ":" means no format is specified, and use the default.
862 */
863 formatp = strchr(atomname, ':');
864 if (formatp != NULL) {
865 formatp++;
866 parse_date_format(formatp, &date_mode);
867 }
868
869 if (!eoemail)
870 goto bad;
871 timestamp = strtoul(eoemail + 2, &zone, 10);
872 if (timestamp == ULONG_MAX)
873 goto bad;
874 tz = strtol(zone, NULL, 10);
875 if ((tz == LONG_MIN || tz == LONG_MAX) && errno == ERANGE)
876 goto bad;
877 v->s = xstrdup(show_date(timestamp, tz, &date_mode));
878 v->ul = timestamp;
879 return;
880 bad:
881 v->s = "";
882 v->ul = 0;
883 }
884
885 /* See grab_values */
886 static void grab_person(const char *who, struct atom_value *val, int deref, struct object *obj, void *buf, unsigned long sz)
887 {
888 int i;
889 int wholen = strlen(who);
890 const char *wholine = NULL;
891
892 for (i = 0; i < used_atom_cnt; i++) {
893 const char *name = used_atom[i].name;
894 struct atom_value *v = &val[i];
895 if (!!deref != (*name == '*'))
896 continue;
897 if (deref)
898 name++;
899 if (strncmp(who, name, wholen))
900 continue;
901 if (name[wholen] != 0 &&
902 strcmp(name + wholen, "name") &&
903 strcmp(name + wholen, "email") &&
904 !starts_with(name + wholen, "date"))
905 continue;
906 if (!wholine)
907 wholine = find_wholine(who, wholen, buf, sz);
908 if (!wholine)
909 return; /* no point looking for it */
910 if (name[wholen] == 0)
911 v->s = copy_line(wholine);
912 else if (!strcmp(name + wholen, "name"))
913 v->s = copy_name(wholine);
914 else if (!strcmp(name + wholen, "email"))
915 v->s = copy_email(wholine);
916 else if (starts_with(name + wholen, "date"))
917 grab_date(wholine, v, name);
918 }
919
920 /*
921 * For a tag or a commit object, if "creator" or "creatordate" is
922 * requested, do something special.
923 */
924 if (strcmp(who, "tagger") && strcmp(who, "committer"))
925 return; /* "author" for commit object is not wanted */
926 if (!wholine)
927 wholine = find_wholine(who, wholen, buf, sz);
928 if (!wholine)
929 return;
930 for (i = 0; i < used_atom_cnt; i++) {
931 const char *name = used_atom[i].name;
932 struct atom_value *v = &val[i];
933 if (!!deref != (*name == '*'))
934 continue;
935 if (deref)
936 name++;
937
938 if (starts_with(name, "creatordate"))
939 grab_date(wholine, v, name);
940 else if (!strcmp(name, "creator"))
941 v->s = copy_line(wholine);
942 }
943 }
944
945 static void find_subpos(const char *buf, unsigned long sz,
946 const char **sub, unsigned long *sublen,
947 const char **body, unsigned long *bodylen,
948 unsigned long *nonsiglen,
949 const char **sig, unsigned long *siglen)
950 {
951 const char *eol;
952 /* skip past header until we hit empty line */
953 while (*buf && *buf != '\n') {
954 eol = strchrnul(buf, '\n');
955 if (*eol)
956 eol++;
957 buf = eol;
958 }
959 /* skip any empty lines */
960 while (*buf == '\n')
961 buf++;
962
963 /* parse signature first; we might not even have a subject line */
964 *sig = buf + parse_signature(buf, strlen(buf));
965 *siglen = strlen(*sig);
966
967 /* subject is first non-empty line */
968 *sub = buf;
969 /* subject goes to first empty line */
970 while (buf < *sig && *buf && *buf != '\n') {
971 eol = strchrnul(buf, '\n');
972 if (*eol)
973 eol++;
974 buf = eol;
975 }
976 *sublen = buf - *sub;
977 /* drop trailing newline, if present */
978 if (*sublen && (*sub)[*sublen - 1] == '\n')
979 *sublen -= 1;
980
981 /* skip any empty lines */
982 while (*buf == '\n')
983 buf++;
984 *body = buf;
985 *bodylen = strlen(buf);
986 *nonsiglen = *sig - buf;
987 }
988
989 /*
990 * If 'lines' is greater than 0, append that many lines from the given
991 * 'buf' of length 'size' to the given strbuf.
992 */
993 static void append_lines(struct strbuf *out, const char *buf, unsigned long size, int lines)
994 {
995 int i;
996 const char *sp, *eol;
997 size_t len;
998
999 sp = buf;
1000
1001 for (i = 0; i < lines && sp < buf + size; i++) {
1002 if (i)
1003 strbuf_addstr(out, "\n ");
1004 eol = memchr(sp, '\n', size - (sp - buf));
1005 len = eol ? eol - sp : size - (sp - buf);
1006 strbuf_add(out, sp, len);
1007 if (!eol)
1008 break;
1009 sp = eol + 1;
1010 }
1011 }
1012
1013 /* See grab_values */
1014 static void grab_sub_body_contents(struct atom_value *val, int deref, struct object *obj, void *buf, unsigned long sz)
1015 {
1016 int i;
1017 const char *subpos = NULL, *bodypos = NULL, *sigpos = NULL;
1018 unsigned long sublen = 0, bodylen = 0, nonsiglen = 0, siglen = 0;
1019
1020 for (i = 0; i < used_atom_cnt; i++) {
1021 struct used_atom *atom = &used_atom[i];
1022 const char *name = atom->name;
1023 struct atom_value *v = &val[i];
1024 if (!!deref != (*name == '*'))
1025 continue;
1026 if (deref)
1027 name++;
1028 if (strcmp(name, "subject") &&
1029 strcmp(name, "body") &&
1030 strcmp(name, "trailers") &&
1031 !starts_with(name, "contents"))
1032 continue;
1033 if (!subpos)
1034 find_subpos(buf, sz,
1035 &subpos, &sublen,
1036 &bodypos, &bodylen, &nonsiglen,
1037 &sigpos, &siglen);
1038
1039 if (atom->u.contents.option == C_SUB)
1040 v->s = copy_subject(subpos, sublen);
1041 else if (atom->u.contents.option == C_BODY_DEP)
1042 v->s = xmemdupz(bodypos, bodylen);
1043 else if (atom->u.contents.option == C_BODY)
1044 v->s = xmemdupz(bodypos, nonsiglen);
1045 else if (atom->u.contents.option == C_SIG)
1046 v->s = xmemdupz(sigpos, siglen);
1047 else if (atom->u.contents.option == C_LINES) {
1048 struct strbuf s = STRBUF_INIT;
1049 const char *contents_end = bodylen + bodypos - siglen;
1050
1051 /* Size is the length of the message after removing the signature */
1052 append_lines(&s, subpos, contents_end - subpos, atom->u.contents.nlines);
1053 v->s = strbuf_detach(&s, NULL);
1054 } else if (atom->u.contents.option == C_TRAILERS) {
1055 struct trailer_info info;
1056
1057 /* Search for trailer info */
1058 trailer_info_get(&info, subpos);
1059 v->s = xmemdupz(info.trailer_start,
1060 info.trailer_end - info.trailer_start);
1061 trailer_info_release(&info);
1062 } else if (atom->u.contents.option == C_BARE)
1063 v->s = xstrdup(subpos);
1064 }
1065 }
1066
1067 /*
1068 * We want to have empty print-string for field requests
1069 * that do not apply (e.g. "authordate" for a tag object)
1070 */
1071 static void fill_missing_values(struct atom_value *val)
1072 {
1073 int i;
1074 for (i = 0; i < used_atom_cnt; i++) {
1075 struct atom_value *v = &val[i];
1076 if (v->s == NULL)
1077 v->s = "";
1078 }
1079 }
1080
1081 /*
1082 * val is a list of atom_value to hold returned values. Extract
1083 * the values for atoms in used_atom array out of (obj, buf, sz).
1084 * when deref is false, (obj, buf, sz) is the object that is
1085 * pointed at by the ref itself; otherwise it is the object the
1086 * ref (which is a tag) refers to.
1087 */
1088 static void grab_values(struct atom_value *val, int deref, struct object *obj, void *buf, unsigned long sz)
1089 {
1090 grab_common_values(val, deref, obj, buf, sz);
1091 switch (obj->type) {
1092 case OBJ_TAG:
1093 grab_tag_values(val, deref, obj, buf, sz);
1094 grab_sub_body_contents(val, deref, obj, buf, sz);
1095 grab_person("tagger", val, deref, obj, buf, sz);
1096 break;
1097 case OBJ_COMMIT:
1098 grab_commit_values(val, deref, obj, buf, sz);
1099 grab_sub_body_contents(val, deref, obj, buf, sz);
1100 grab_person("author", val, deref, obj, buf, sz);
1101 grab_person("committer", val, deref, obj, buf, sz);
1102 break;
1103 case OBJ_TREE:
1104 /* grab_tree_values(val, deref, obj, buf, sz); */
1105 break;
1106 case OBJ_BLOB:
1107 /* grab_blob_values(val, deref, obj, buf, sz); */
1108 break;
1109 default:
1110 die("Eh? Object of type %d?", obj->type);
1111 }
1112 }
1113
1114 static inline char *copy_advance(char *dst, const char *src)
1115 {
1116 while (*src)
1117 *dst++ = *src++;
1118 return dst;
1119 }
1120
1121 static const char *lstrip_ref_components(const char *refname, int len)
1122 {
1123 long remaining = len;
1124 const char *start = refname;
1125
1126 if (len < 0) {
1127 int i;
1128 const char *p = refname;
1129
1130 /* Find total no of '/' separated path-components */
1131 for (i = 0; p[i]; p[i] == '/' ? i++ : *p++)
1132 ;
1133 /*
1134 * The number of components we need to strip is now
1135 * the total minus the components to be left (Plus one
1136 * because we count the number of '/', but the number
1137 * of components is one more than the no of '/').
1138 */
1139 remaining = i + len + 1;
1140 }
1141
1142 while (remaining > 0) {
1143 switch (*start++) {
1144 case '\0':
1145 return "";
1146 case '/':
1147 remaining--;
1148 break;
1149 }
1150 }
1151
1152 return start;
1153 }
1154
1155 static const char *rstrip_ref_components(const char *refname, int len)
1156 {
1157 long remaining = len;
1158 char *start = xstrdup(refname);
1159
1160 if (len < 0) {
1161 int i;
1162 const char *p = refname;
1163
1164 /* Find total no of '/' separated path-components */
1165 for (i = 0; p[i]; p[i] == '/' ? i++ : *p++)
1166 ;
1167 /*
1168 * The number of components we need to strip is now
1169 * the total minus the components to be left (Plus one
1170 * because we count the number of '/', but the number
1171 * of components is one more than the no of '/').
1172 */
1173 remaining = i + len + 1;
1174 }
1175
1176 while (remaining-- > 0) {
1177 char *p = strrchr(start, '/');
1178 if (p == NULL)
1179 return "";
1180 else
1181 p[0] = '\0';
1182 }
1183 return start;
1184 }
1185
1186 static const char *show_ref(struct refname_atom *atom, const char *refname)
1187 {
1188 if (atom->option == R_SHORT)
1189 return shorten_unambiguous_ref(refname, warn_ambiguous_refs);
1190 else if (atom->option == R_LSTRIP)
1191 return lstrip_ref_components(refname, atom->lstrip);
1192 else if (atom->option == R_RSTRIP)
1193 return rstrip_ref_components(refname, atom->rstrip);
1194 else
1195 return refname;
1196 }
1197
1198 static void fill_remote_ref_details(struct used_atom *atom, const char *refname,
1199 struct branch *branch, const char **s)
1200 {
1201 int num_ours, num_theirs;
1202 if (atom->u.remote_ref.option == RR_REF)
1203 *s = show_ref(&atom->u.remote_ref.refname, refname);
1204 else if (atom->u.remote_ref.option == RR_TRACK) {
1205 if (stat_tracking_info(branch, &num_ours,
1206 &num_theirs, NULL)) {
1207 *s = xstrdup(msgs.gone);
1208 } else if (!num_ours && !num_theirs)
1209 *s = "";
1210 else if (!num_ours)
1211 *s = xstrfmt(msgs.behind, num_theirs);
1212 else if (!num_theirs)
1213 *s = xstrfmt(msgs.ahead, num_ours);
1214 else
1215 *s = xstrfmt(msgs.ahead_behind,
1216 num_ours, num_theirs);
1217 if (!atom->u.remote_ref.nobracket && *s[0]) {
1218 const char *to_free = *s;
1219 *s = xstrfmt("[%s]", *s);
1220 free((void *)to_free);
1221 }
1222 } else if (atom->u.remote_ref.option == RR_TRACKSHORT) {
1223 if (stat_tracking_info(branch, &num_ours,
1224 &num_theirs, NULL))
1225 return;
1226
1227 if (!num_ours && !num_theirs)
1228 *s = "=";
1229 else if (!num_ours)
1230 *s = "<";
1231 else if (!num_theirs)
1232 *s = ">";
1233 else
1234 *s = "<>";
1235 } else
1236 die("BUG: unhandled RR_* enum");
1237 }
1238
1239 char *get_head_description(void)
1240 {
1241 struct strbuf desc = STRBUF_INIT;
1242 struct wt_status_state state;
1243 memset(&state, 0, sizeof(state));
1244 wt_status_get_state(&state, 1);
1245 if (state.rebase_in_progress ||
1246 state.rebase_interactive_in_progress)
1247 strbuf_addf(&desc, _("(no branch, rebasing %s)"),
1248 state.branch);
1249 else if (state.bisect_in_progress)
1250 strbuf_addf(&desc, _("(no branch, bisect started on %s)"),
1251 state.branch);
1252 else if (state.detached_from) {
1253 if (state.detached_at)
1254 /* TRANSLATORS: make sure this matches
1255 "HEAD detached at " in wt-status.c */
1256 strbuf_addf(&desc, _("(HEAD detached at %s)"),
1257 state.detached_from);
1258 else
1259 /* TRANSLATORS: make sure this matches
1260 "HEAD detached from " in wt-status.c */
1261 strbuf_addf(&desc, _("(HEAD detached from %s)"),
1262 state.detached_from);
1263 }
1264 else
1265 strbuf_addstr(&desc, _("(no branch)"));
1266 free(state.branch);
1267 free(state.onto);
1268 free(state.detached_from);
1269 return strbuf_detach(&desc, NULL);
1270 }
1271
1272 static const char *get_symref(struct used_atom *atom, struct ref_array_item *ref)
1273 {
1274 if (!ref->symref)
1275 return "";
1276 else
1277 return show_ref(&atom->u.refname, ref->symref);
1278 }
1279
1280 static const char *get_refname(struct used_atom *atom, struct ref_array_item *ref)
1281 {
1282 if (ref->kind & FILTER_REFS_DETACHED_HEAD)
1283 return get_head_description();
1284 return show_ref(&atom->u.refname, ref->refname);
1285 }
1286
1287 /*
1288 * Parse the object referred by ref, and grab needed value.
1289 */
1290 static void populate_value(struct ref_array_item *ref)
1291 {
1292 void *buf;
1293 struct object *obj;
1294 int eaten, i;
1295 unsigned long size;
1296 const unsigned char *tagged;
1297
1298 ref->value = xcalloc(used_atom_cnt, sizeof(struct atom_value));
1299
1300 if (need_symref && (ref->flag & REF_ISSYMREF) && !ref->symref) {
1301 struct object_id unused1;
1302 ref->symref = resolve_refdup(ref->refname, RESOLVE_REF_READING,
1303 unused1.hash, NULL);
1304 if (!ref->symref)
1305 ref->symref = "";
1306 }
1307
1308 /* Fill in specials first */
1309 for (i = 0; i < used_atom_cnt; i++) {
1310 struct used_atom *atom = &used_atom[i];
1311 const char *name = used_atom[i].name;
1312 struct atom_value *v = &ref->value[i];
1313 int deref = 0;
1314 const char *refname;
1315 struct branch *branch = NULL;
1316
1317 v->handler = append_atom;
1318 v->atom = atom;
1319
1320 if (*name == '*') {
1321 deref = 1;
1322 name++;
1323 }
1324
1325 if (starts_with(name, "refname"))
1326 refname = get_refname(atom, ref);
1327 else if (starts_with(name, "symref"))
1328 refname = get_symref(atom, ref);
1329 else if (starts_with(name, "upstream")) {
1330 const char *branch_name;
1331 /* only local branches may have an upstream */
1332 if (!skip_prefix(ref->refname, "refs/heads/",
1333 &branch_name))
1334 continue;
1335 branch = branch_get(branch_name);
1336
1337 refname = branch_get_upstream(branch, NULL);
1338 if (refname)
1339 fill_remote_ref_details(atom, refname, branch, &v->s);
1340 continue;
1341 } else if (starts_with(name, "push")) {
1342 const char *branch_name;
1343 if (!skip_prefix(ref->refname, "refs/heads/",
1344 &branch_name))
1345 continue;
1346 branch = branch_get(branch_name);
1347
1348 refname = branch_get_push(branch, NULL);
1349 if (!refname)
1350 continue;
1351 fill_remote_ref_details(atom, refname, branch, &v->s);
1352 continue;
1353 } else if (starts_with(name, "color:")) {
1354 v->s = atom->u.color;
1355 continue;
1356 } else if (!strcmp(name, "flag")) {
1357 char buf[256], *cp = buf;
1358 if (ref->flag & REF_ISSYMREF)
1359 cp = copy_advance(cp, ",symref");
1360 if (ref->flag & REF_ISPACKED)
1361 cp = copy_advance(cp, ",packed");
1362 if (cp == buf)
1363 v->s = "";
1364 else {
1365 *cp = '\0';
1366 v->s = xstrdup(buf + 1);
1367 }
1368 continue;
1369 } else if (!deref && grab_objectname(name, ref->objectname, v, atom)) {
1370 continue;
1371 } else if (!strcmp(name, "HEAD")) {
1372 const char *head;
1373 unsigned char sha1[20];
1374
1375 head = resolve_ref_unsafe("HEAD", RESOLVE_REF_READING,
1376 sha1, NULL);
1377 if (head && !strcmp(ref->refname, head))
1378 v->s = "*";
1379 else
1380 v->s = " ";
1381 continue;
1382 } else if (starts_with(name, "align")) {
1383 v->handler = align_atom_handler;
1384 continue;
1385 } else if (!strcmp(name, "end")) {
1386 v->handler = end_atom_handler;
1387 continue;
1388 } else if (starts_with(name, "if")) {
1389 const char *s;
1390
1391 if (skip_prefix(name, "if:", &s))
1392 v->s = xstrdup(s);
1393 v->handler = if_atom_handler;
1394 continue;
1395 } else if (!strcmp(name, "then")) {
1396 v->handler = then_atom_handler;
1397 continue;
1398 } else if (!strcmp(name, "else")) {
1399 v->handler = else_atom_handler;
1400 continue;
1401 } else
1402 continue;
1403
1404 if (!deref)
1405 v->s = refname;
1406 else
1407 v->s = xstrfmt("%s^{}", refname);
1408 }
1409
1410 for (i = 0; i < used_atom_cnt; i++) {
1411 struct atom_value *v = &ref->value[i];
1412 if (v->s == NULL)
1413 goto need_obj;
1414 }
1415 return;
1416
1417 need_obj:
1418 buf = get_obj(ref->objectname, &obj, &size, &eaten);
1419 if (!buf)
1420 die(_("missing object %s for %s"),
1421 sha1_to_hex(ref->objectname), ref->refname);
1422 if (!obj)
1423 die(_("parse_object_buffer failed on %s for %s"),
1424 sha1_to_hex(ref->objectname), ref->refname);
1425
1426 grab_values(ref->value, 0, obj, buf, size);
1427 if (!eaten)
1428 free(buf);
1429
1430 /*
1431 * If there is no atom that wants to know about tagged
1432 * object, we are done.
1433 */
1434 if (!need_tagged || (obj->type != OBJ_TAG))
1435 return;
1436
1437 /*
1438 * If it is a tag object, see if we use a value that derefs
1439 * the object, and if we do grab the object it refers to.
1440 */
1441 tagged = ((struct tag *)obj)->tagged->oid.hash;
1442
1443 /*
1444 * NEEDSWORK: This derefs tag only once, which
1445 * is good to deal with chains of trust, but
1446 * is not consistent with what deref_tag() does
1447 * which peels the onion to the core.
1448 */
1449 buf = get_obj(tagged, &obj, &size, &eaten);
1450 if (!buf)
1451 die(_("missing object %s for %s"),
1452 sha1_to_hex(tagged), ref->refname);
1453 if (!obj)
1454 die(_("parse_object_buffer failed on %s for %s"),
1455 sha1_to_hex(tagged), ref->refname);
1456 grab_values(ref->value, 1, obj, buf, size);
1457 if (!eaten)
1458 free(buf);
1459 }
1460
1461 /*
1462 * Given a ref, return the value for the atom. This lazily gets value
1463 * out of the object by calling populate value.
1464 */
1465 static void get_ref_atom_value(struct ref_array_item *ref, int atom, struct atom_value **v)
1466 {
1467 if (!ref->value) {
1468 populate_value(ref);
1469 fill_missing_values(ref->value);
1470 }
1471 *v = &ref->value[atom];
1472 }
1473
1474 /*
1475 * Unknown has to be "0" here, because that's the default value for
1476 * contains_cache slab entries that have not yet been assigned.
1477 */
1478 enum contains_result {
1479 CONTAINS_UNKNOWN = 0,
1480 CONTAINS_NO,
1481 CONTAINS_YES
1482 };
1483
1484 define_commit_slab(contains_cache, enum contains_result);
1485
1486 struct ref_filter_cbdata {
1487 struct ref_array *array;
1488 struct ref_filter *filter;
1489 struct contains_cache contains_cache;
1490 };
1491
1492 /*
1493 * Mimicking the real stack, this stack lives on the heap, avoiding stack
1494 * overflows.
1495 *
1496 * At each recursion step, the stack items points to the commits whose
1497 * ancestors are to be inspected.
1498 */
1499 struct contains_stack {
1500 int nr, alloc;
1501 struct contains_stack_entry {
1502 struct commit *commit;
1503 struct commit_list *parents;
1504 } *contains_stack;
1505 };
1506
1507 static int in_commit_list(const struct commit_list *want, struct commit *c)
1508 {
1509 for (; want; want = want->next)
1510 if (!oidcmp(&want->item->object.oid, &c->object.oid))
1511 return 1;
1512 return 0;
1513 }
1514
1515 /*
1516 * Test whether the candidate or one of its parents is contained in the list.
1517 * Do not recurse to find out, though, but return -1 if inconclusive.
1518 */
1519 static enum contains_result contains_test(struct commit *candidate,
1520 const struct commit_list *want,
1521 struct contains_cache *cache)
1522 {
1523 enum contains_result *cached = contains_cache_at(cache, candidate);
1524
1525 /* If we already have the answer cached, return that. */
1526 if (*cached)
1527 return *cached;
1528
1529 /* or are we it? */
1530 if (in_commit_list(want, candidate)) {
1531 *cached = CONTAINS_YES;
1532 return CONTAINS_YES;
1533 }
1534
1535 /* Otherwise, we don't know; prepare to recurse */
1536 parse_commit_or_die(candidate);
1537 return CONTAINS_UNKNOWN;
1538 }
1539
1540 static void push_to_contains_stack(struct commit *candidate, struct contains_stack *contains_stack)
1541 {
1542 ALLOC_GROW(contains_stack->contains_stack, contains_stack->nr + 1, contains_stack->alloc);
1543 contains_stack->contains_stack[contains_stack->nr].commit = candidate;
1544 contains_stack->contains_stack[contains_stack->nr++].parents = candidate->parents;
1545 }
1546
1547 static enum contains_result contains_tag_algo(struct commit *candidate,
1548 const struct commit_list *want,
1549 struct contains_cache *cache)
1550 {
1551 struct contains_stack contains_stack = { 0, 0, NULL };
1552 enum contains_result result = contains_test(candidate, want, cache);
1553
1554 if (result != CONTAINS_UNKNOWN)
1555 return result;
1556
1557 push_to_contains_stack(candidate, &contains_stack);
1558 while (contains_stack.nr) {
1559 struct contains_stack_entry *entry = &contains_stack.contains_stack[contains_stack.nr - 1];
1560 struct commit *commit = entry->commit;
1561 struct commit_list *parents = entry->parents;
1562
1563 if (!parents) {
1564 *contains_cache_at(cache, commit) = CONTAINS_NO;
1565 contains_stack.nr--;
1566 }
1567 /*
1568 * If we just popped the stack, parents->item has been marked,
1569 * therefore contains_test will return a meaningful yes/no.
1570 */
1571 else switch (contains_test(parents->item, want, cache)) {
1572 case CONTAINS_YES:
1573 *contains_cache_at(cache, commit) = CONTAINS_YES;
1574 contains_stack.nr--;
1575 break;
1576 case CONTAINS_NO:
1577 entry->parents = parents->next;
1578 break;
1579 case CONTAINS_UNKNOWN:
1580 push_to_contains_stack(parents->item, &contains_stack);
1581 break;
1582 }
1583 }
1584 free(contains_stack.contains_stack);
1585 return contains_test(candidate, want, cache);
1586 }
1587
1588 static int commit_contains(struct ref_filter *filter, struct commit *commit,
1589 struct contains_cache *cache)
1590 {
1591 if (filter->with_commit_tag_algo)
1592 return contains_tag_algo(commit, filter->with_commit, cache) == CONTAINS_YES;
1593 return is_descendant_of(commit, filter->with_commit);
1594 }
1595
1596 /*
1597 * Return 1 if the refname matches one of the patterns, otherwise 0.
1598 * A pattern can be a literal prefix (e.g. a refname "refs/heads/master"
1599 * matches a pattern "refs/heads/mas") or a wildcard (e.g. the same ref
1600 * matches "refs/heads/mas*", too).
1601 */
1602 static int match_pattern(const struct ref_filter *filter, const char *refname)
1603 {
1604 const char **patterns = filter->name_patterns;
1605 unsigned flags = 0;
1606
1607 if (filter->ignore_case)
1608 flags |= WM_CASEFOLD;
1609
1610 /*
1611 * When no '--format' option is given we need to skip the prefix
1612 * for matching refs of tags and branches.
1613 */
1614 (void)(skip_prefix(refname, "refs/tags/", &refname) ||
1615 skip_prefix(refname, "refs/heads/", &refname) ||
1616 skip_prefix(refname, "refs/remotes/", &refname) ||
1617 skip_prefix(refname, "refs/", &refname));
1618
1619 for (; *patterns; patterns++) {
1620 if (!wildmatch(*patterns, refname, flags, NULL))
1621 return 1;
1622 }
1623 return 0;
1624 }
1625
1626 /*
1627 * Return 1 if the refname matches one of the patterns, otherwise 0.
1628 * A pattern can be path prefix (e.g. a refname "refs/heads/master"
1629 * matches a pattern "refs/heads/" but not "refs/heads/m") or a
1630 * wildcard (e.g. the same ref matches "refs/heads/m*", too).
1631 */
1632 static int match_name_as_path(const struct ref_filter *filter, const char *refname)
1633 {
1634 const char **pattern = filter->name_patterns;
1635 int namelen = strlen(refname);
1636 unsigned flags = WM_PATHNAME;
1637
1638 if (filter->ignore_case)
1639 flags |= WM_CASEFOLD;
1640
1641 for (; *pattern; pattern++) {
1642 const char *p = *pattern;
1643 int plen = strlen(p);
1644
1645 if ((plen <= namelen) &&
1646 !strncmp(refname, p, plen) &&
1647 (refname[plen] == '\0' ||
1648 refname[plen] == '/' ||
1649 p[plen-1] == '/'))
1650 return 1;
1651 if (!wildmatch(p, refname, WM_PATHNAME, NULL))
1652 return 1;
1653 }
1654 return 0;
1655 }
1656
1657 /* Return 1 if the refname matches one of the patterns, otherwise 0. */
1658 static int filter_pattern_match(struct ref_filter *filter, const char *refname)
1659 {
1660 if (!*filter->name_patterns)
1661 return 1; /* No pattern always matches */
1662 if (filter->match_as_path)
1663 return match_name_as_path(filter, refname);
1664 return match_pattern(filter, refname);
1665 }
1666
1667 /*
1668 * Given a ref (sha1, refname), check if the ref belongs to the array
1669 * of sha1s. If the given ref is a tag, check if the given tag points
1670 * at one of the sha1s in the given sha1 array.
1671 * the given sha1_array.
1672 * NEEDSWORK:
1673 * 1. Only a single level of inderection is obtained, we might want to
1674 * change this to account for multiple levels (e.g. annotated tags
1675 * pointing to annotated tags pointing to a commit.)
1676 * 2. As the refs are cached we might know what refname peels to without
1677 * the need to parse the object via parse_object(). peel_ref() might be a
1678 * more efficient alternative to obtain the pointee.
1679 */
1680 static const unsigned char *match_points_at(struct sha1_array *points_at,
1681 const unsigned char *sha1,
1682 const char *refname)
1683 {
1684 const unsigned char *tagged_sha1 = NULL;
1685 struct object *obj;
1686
1687 if (sha1_array_lookup(points_at, sha1) >= 0)
1688 return sha1;
1689 obj = parse_object(sha1);
1690 if (!obj)
1691 die(_("malformed object at '%s'"), refname);
1692 if (obj->type == OBJ_TAG)
1693 tagged_sha1 = ((struct tag *)obj)->tagged->oid.hash;
1694 if (tagged_sha1 && sha1_array_lookup(points_at, tagged_sha1) >= 0)
1695 return tagged_sha1;
1696 return NULL;
1697 }
1698
1699 /* Allocate space for a new ref_array_item and copy the objectname and flag to it */
1700 static struct ref_array_item *new_ref_array_item(const char *refname,
1701 const unsigned char *objectname,
1702 int flag)
1703 {
1704 struct ref_array_item *ref;
1705 FLEX_ALLOC_STR(ref, refname, refname);
1706 hashcpy(ref->objectname, objectname);
1707 ref->flag = flag;
1708
1709 return ref;
1710 }
1711
1712 static int ref_kind_from_refname(const char *refname)
1713 {
1714 unsigned int i;
1715
1716 static struct {
1717 const char *prefix;
1718 unsigned int kind;
1719 } ref_kind[] = {
1720 { "refs/heads/" , FILTER_REFS_BRANCHES },
1721 { "refs/remotes/" , FILTER_REFS_REMOTES },
1722 { "refs/tags/", FILTER_REFS_TAGS}
1723 };
1724
1725 if (!strcmp(refname, "HEAD"))
1726 return FILTER_REFS_DETACHED_HEAD;
1727
1728 for (i = 0; i < ARRAY_SIZE(ref_kind); i++) {
1729 if (starts_with(refname, ref_kind[i].prefix))
1730 return ref_kind[i].kind;
1731 }
1732
1733 return FILTER_REFS_OTHERS;
1734 }
1735
1736 static int filter_ref_kind(struct ref_filter *filter, const char *refname)
1737 {
1738 if (filter->kind == FILTER_REFS_BRANCHES ||
1739 filter->kind == FILTER_REFS_REMOTES ||
1740 filter->kind == FILTER_REFS_TAGS)
1741 return filter->kind;
1742 return ref_kind_from_refname(refname);
1743 }
1744
1745 /*
1746 * A call-back given to for_each_ref(). Filter refs and keep them for
1747 * later object processing.
1748 */
1749 static int ref_filter_handler(const char *refname, const struct object_id *oid, int flag, void *cb_data)
1750 {
1751 struct ref_filter_cbdata *ref_cbdata = cb_data;
1752 struct ref_filter *filter = ref_cbdata->filter;
1753 struct ref_array_item *ref;
1754 struct commit *commit = NULL;
1755 unsigned int kind;
1756
1757 if (flag & REF_BAD_NAME) {
1758 warning(_("ignoring ref with broken name %s"), refname);
1759 return 0;
1760 }
1761
1762 if (flag & REF_ISBROKEN) {
1763 warning(_("ignoring broken ref %s"), refname);
1764 return 0;
1765 }
1766
1767 /* Obtain the current ref kind from filter_ref_kind() and ignore unwanted refs. */
1768 kind = filter_ref_kind(filter, refname);
1769 if (!(kind & filter->kind))
1770 return 0;
1771
1772 if (!filter_pattern_match(filter, refname))
1773 return 0;
1774
1775 if (filter->points_at.nr && !match_points_at(&filter->points_at, oid->hash, refname))
1776 return 0;
1777
1778 /*
1779 * A merge filter is applied on refs pointing to commits. Hence
1780 * obtain the commit using the 'oid' available and discard all
1781 * non-commits early. The actual filtering is done later.
1782 */
1783 if (filter->merge_commit || filter->with_commit || filter->verbose) {
1784 commit = lookup_commit_reference_gently(oid->hash, 1);
1785 if (!commit)
1786 return 0;
1787 /* We perform the filtering for the '--contains' option */
1788 if (filter->with_commit &&
1789 !commit_contains(filter, commit, &ref_cbdata->contains_cache))
1790 return 0;
1791 }
1792
1793 /*
1794 * We do not open the object yet; sort may only need refname
1795 * to do its job and the resulting list may yet to be pruned
1796 * by maxcount logic.
1797 */
1798 ref = new_ref_array_item(refname, oid->hash, flag);
1799 ref->commit = commit;
1800
1801 REALLOC_ARRAY(ref_cbdata->array->items, ref_cbdata->array->nr + 1);
1802 ref_cbdata->array->items[ref_cbdata->array->nr++] = ref;
1803 ref->kind = kind;
1804 return 0;
1805 }
1806
1807 /* Free memory allocated for a ref_array_item */
1808 static void free_array_item(struct ref_array_item *item)
1809 {
1810 free((char *)item->symref);
1811 free(item);
1812 }
1813
1814 /* Free all memory allocated for ref_array */
1815 void ref_array_clear(struct ref_array *array)
1816 {
1817 int i;
1818
1819 for (i = 0; i < array->nr; i++)
1820 free_array_item(array->items[i]);
1821 free(array->items);
1822 array->items = NULL;
1823 array->nr = array->alloc = 0;
1824 }
1825
1826 static void do_merge_filter(struct ref_filter_cbdata *ref_cbdata)
1827 {
1828 struct rev_info revs;
1829 int i, old_nr;
1830 struct ref_filter *filter = ref_cbdata->filter;
1831 struct ref_array *array = ref_cbdata->array;
1832 struct commit **to_clear = xcalloc(sizeof(struct commit *), array->nr);
1833
1834 init_revisions(&revs, NULL);
1835
1836 for (i = 0; i < array->nr; i++) {
1837 struct ref_array_item *item = array->items[i];
1838 add_pending_object(&revs, &item->commit->object, item->refname);
1839 to_clear[i] = item->commit;
1840 }
1841
1842 filter->merge_commit->object.flags |= UNINTERESTING;
1843 add_pending_object(&revs, &filter->merge_commit->object, "");
1844
1845 revs.limited = 1;
1846 if (prepare_revision_walk(&revs))
1847 die(_("revision walk setup failed"));
1848
1849 old_nr = array->nr;
1850 array->nr = 0;
1851
1852 for (i = 0; i < old_nr; i++) {
1853 struct ref_array_item *item = array->items[i];
1854 struct commit *commit = item->commit;
1855
1856 int is_merged = !!(commit->object.flags & UNINTERESTING);
1857
1858 if (is_merged == (filter->merge == REF_FILTER_MERGED_INCLUDE))
1859 array->items[array->nr++] = array->items[i];
1860 else
1861 free_array_item(item);
1862 }
1863
1864 for (i = 0; i < old_nr; i++)
1865 clear_commit_marks(to_clear[i], ALL_REV_FLAGS);
1866 clear_commit_marks(filter->merge_commit, ALL_REV_FLAGS);
1867 free(to_clear);
1868 }
1869
1870 /*
1871 * API for filtering a set of refs. Based on the type of refs the user
1872 * has requested, we iterate through those refs and apply filters
1873 * as per the given ref_filter structure and finally store the
1874 * filtered refs in the ref_array structure.
1875 */
1876 int filter_refs(struct ref_array *array, struct ref_filter *filter, unsigned int type)
1877 {
1878 struct ref_filter_cbdata ref_cbdata;
1879 int ret = 0;
1880 unsigned int broken = 0;
1881
1882 ref_cbdata.array = array;
1883 ref_cbdata.filter = filter;
1884
1885 if (type & FILTER_REFS_INCLUDE_BROKEN)
1886 broken = 1;
1887 filter->kind = type & FILTER_REFS_KIND_MASK;
1888
1889 init_contains_cache(&ref_cbdata.contains_cache);
1890
1891 /* Simple per-ref filtering */
1892 if (!filter->kind)
1893 die("filter_refs: invalid type");
1894 else {
1895 /*
1896 * For common cases where we need only branches or remotes or tags,
1897 * we only iterate through those refs. If a mix of refs is needed,
1898 * we iterate over all refs and filter out required refs with the help
1899 * of filter_ref_kind().
1900 */
1901 if (filter->kind == FILTER_REFS_BRANCHES)
1902 ret = for_each_fullref_in("refs/heads/", ref_filter_handler, &ref_cbdata, broken);
1903 else if (filter->kind == FILTER_REFS_REMOTES)
1904 ret = for_each_fullref_in("refs/remotes/", ref_filter_handler, &ref_cbdata, broken);
1905 else if (filter->kind == FILTER_REFS_TAGS)
1906 ret = for_each_fullref_in("refs/tags/", ref_filter_handler, &ref_cbdata, broken);
1907 else if (filter->kind & FILTER_REFS_ALL)
1908 ret = for_each_fullref_in("", ref_filter_handler, &ref_cbdata, broken);
1909 if (!ret && (filter->kind & FILTER_REFS_DETACHED_HEAD))
1910 head_ref(ref_filter_handler, &ref_cbdata);
1911 }
1912
1913 clear_contains_cache(&ref_cbdata.contains_cache);
1914
1915 /* Filters that need revision walking */
1916 if (filter->merge_commit)
1917 do_merge_filter(&ref_cbdata);
1918
1919 return ret;
1920 }
1921
1922 static int cmp_ref_sorting(struct ref_sorting *s, struct ref_array_item *a, struct ref_array_item *b)
1923 {
1924 struct atom_value *va, *vb;
1925 int cmp;
1926 cmp_type cmp_type = used_atom[s->atom].type;
1927 int (*cmp_fn)(const char *, const char *);
1928
1929 get_ref_atom_value(a, s->atom, &va);
1930 get_ref_atom_value(b, s->atom, &vb);
1931 cmp_fn = s->ignore_case ? strcasecmp : strcmp;
1932 if (s->version)
1933 cmp = versioncmp(va->s, vb->s);
1934 else if (cmp_type == FIELD_STR)
1935 cmp = cmp_fn(va->s, vb->s);
1936 else {
1937 if (va->ul < vb->ul)
1938 cmp = -1;
1939 else if (va->ul == vb->ul)
1940 cmp = cmp_fn(a->refname, b->refname);
1941 else
1942 cmp = 1;
1943 }
1944
1945 return (s->reverse) ? -cmp : cmp;
1946 }
1947
1948 static int compare_refs(const void *a_, const void *b_, void *ref_sorting)
1949 {
1950 struct ref_array_item *a = *((struct ref_array_item **)a_);
1951 struct ref_array_item *b = *((struct ref_array_item **)b_);
1952 struct ref_sorting *s;
1953
1954 for (s = ref_sorting; s; s = s->next) {
1955 int cmp = cmp_ref_sorting(s, a, b);
1956 if (cmp)
1957 return cmp;
1958 }
1959 return 0;
1960 }
1961
1962 void ref_array_sort(struct ref_sorting *sorting, struct ref_array *array)
1963 {
1964 QSORT_S(array->items, array->nr, compare_refs, sorting);
1965 }
1966
1967 static void append_literal(const char *cp, const char *ep, struct ref_formatting_state *state)
1968 {
1969 struct strbuf *s = &state->stack->output;
1970
1971 while (*cp && (!ep || cp < ep)) {
1972 if (*cp == '%') {
1973 if (cp[1] == '%')
1974 cp++;
1975 else {
1976 int ch = hex2chr(cp + 1);
1977 if (0 <= ch) {
1978 strbuf_addch(s, ch);
1979 cp += 3;
1980 continue;
1981 }
1982 }
1983 }
1984 strbuf_addch(s, *cp);
1985 cp++;
1986 }
1987 }
1988
1989 void format_ref_array_item(struct ref_array_item *info, const char *format,
1990 int quote_style, struct strbuf *final_buf)
1991 {
1992 const char *cp, *sp, *ep;
1993 struct ref_formatting_state state = REF_FORMATTING_STATE_INIT;
1994
1995 state.quote_style = quote_style;
1996 push_stack_element(&state.stack);
1997
1998 for (cp = format; *cp && (sp = find_next(cp)); cp = ep + 1) {
1999 struct atom_value *atomv;
2000
2001 ep = strchr(sp, ')');
2002 if (cp < sp)
2003 append_literal(cp, sp, &state);
2004 get_ref_atom_value(info, parse_ref_filter_atom(sp + 2, ep), &atomv);
2005 atomv->handler(atomv, &state);
2006 }
2007 if (*cp) {
2008 sp = cp + strlen(cp);
2009 append_literal(cp, sp, &state);
2010 }
2011 if (need_color_reset_at_eol) {
2012 struct atom_value resetv;
2013 char color[COLOR_MAXLEN] = "";
2014
2015 if (color_parse("reset", color) < 0)
2016 die("BUG: couldn't parse 'reset' as a color");
2017 resetv.s = color;
2018 append_atom(&resetv, &state);
2019 }
2020 if (state.stack->prev)
2021 die(_("format: %%(end) atom missing"));
2022 strbuf_addbuf(final_buf, &state.stack->output);
2023 pop_stack_element(&state.stack);
2024 }
2025
2026 void show_ref_array_item(struct ref_array_item *info, const char *format, int quote_style)
2027 {
2028 struct strbuf final_buf = STRBUF_INIT;
2029
2030 format_ref_array_item(info, format, quote_style, &final_buf);
2031 fwrite(final_buf.buf, 1, final_buf.len, stdout);
2032 strbuf_release(&final_buf);
2033 putchar('\n');
2034 }
2035
2036 void pretty_print_ref(const char *name, const unsigned char *sha1,
2037 const char *format)
2038 {
2039 struct ref_array_item *ref_item;
2040 ref_item = new_ref_array_item(name, sha1, 0);
2041 ref_item->kind = ref_kind_from_refname(name);
2042 show_ref_array_item(ref_item, format, 0);
2043 free_array_item(ref_item);
2044 }
2045
2046 /* If no sorting option is given, use refname to sort as default */
2047 struct ref_sorting *ref_default_sorting(void)
2048 {
2049 static const char cstr_name[] = "refname";
2050
2051 struct ref_sorting *sorting = xcalloc(1, sizeof(*sorting));
2052
2053 sorting->next = NULL;
2054 sorting->atom = parse_ref_filter_atom(cstr_name, cstr_name + strlen(cstr_name));
2055 return sorting;
2056 }
2057
2058 int parse_opt_ref_sorting(const struct option *opt, const char *arg, int unset)
2059 {
2060 struct ref_sorting **sorting_tail = opt->value;
2061 struct ref_sorting *s;
2062 int len;
2063
2064 if (!arg) /* should --no-sort void the list ? */
2065 return -1;
2066
2067 s = xcalloc(1, sizeof(*s));
2068 s->next = *sorting_tail;
2069 *sorting_tail = s;
2070
2071 if (*arg == '-') {
2072 s->reverse = 1;
2073 arg++;
2074 }
2075 if (skip_prefix(arg, "version:", &arg) ||
2076 skip_prefix(arg, "v:", &arg))
2077 s->version = 1;
2078 len = strlen(arg);
2079 s->atom = parse_ref_filter_atom(arg, arg+len);
2080 return 0;
2081 }
2082
2083 int parse_opt_merge_filter(const struct option *opt, const char *arg, int unset)
2084 {
2085 struct ref_filter *rf = opt->value;
2086 unsigned char sha1[20];
2087
2088 rf->merge = starts_with(opt->long_name, "no")
2089 ? REF_FILTER_MERGED_OMIT
2090 : REF_FILTER_MERGED_INCLUDE;
2091
2092 if (get_sha1(arg, sha1))
2093 die(_("malformed object name %s"), arg);
2094
2095 rf->merge_commit = lookup_commit_reference_gently(sha1, 0);
2096 if (!rf->merge_commit)
2097 return opterror(opt, "must point to a commit", 0);
2098
2099 return 0;
2100 }
git for Debian