sq_quote_argv: drop maxlen parameter
[git/git.git] / builtin / am.c
CommitLineData
73c2779f
PT
1/*
2 * Builtin "git am"
3 *
4 * Based on git-am.sh by Junio C Hamano.
5 */
6#include "cache.h"
b2141fc1 7#include "config.h"
73c2779f
PT
8#include "builtin.h"
9#include "exec_cmd.h"
8c3bd9e2
PT
10#include "parse-options.h"
11#include "dir.h"
11c2177f 12#include "run-command.h"
3e20dcf3 13#include "quote.h"
db86e61c 14#include "tempfile.h"
38a824fe 15#include "lockfile.h"
c9e8d960
PT
16#include "cache-tree.h"
17#include "refs.h"
18#include "commit.h"
32a5fcbf
PT
19#include "diff.h"
20#include "diffcore.h"
9990080c
PT
21#include "unpack-trees.h"
22#include "branch.h"
eb898b83 23#include "sequencer.h"
84f3de28
PT
24#include "revision.h"
25#include "merge-recursive.h"
df2760a5
PT
26#include "revision.h"
27#include "log-tree.h"
88b291fe 28#include "notes-utils.h"
f1cb96d6 29#include "rerere.h"
7ff26832 30#include "prompt.h"
4b98bae2 31#include "mailinfo.h"
edfac5eb 32#include "apply.h"
a77598ef 33#include "string-list.h"
3836d88a 34#include "packfile.h"
3e20dcf3
PT
35
36/**
37 * Returns 1 if the file is empty or does not exist, 0 otherwise.
38 */
39static int is_empty_file(const char *filename)
40{
41 struct stat st;
42
43 if (stat(filename, &st) < 0) {
44 if (errno == ENOENT)
45 return 1;
46 die_errno(_("could not stat %s"), filename);
47 }
48
49 return !st.st_size;
50}
11c2177f 51
38a824fe
PT
52/**
53 * Returns the length of the first line of msg.
54 */
55static int linelen(const char *msg)
56{
57 return strchrnul(msg, '\n') - msg;
58}
59
5ae41c79
PT
60/**
61 * Returns true if `str` consists of only whitespace, false otherwise.
62 */
63static int str_isspace(const char *str)
64{
65 for (; *str; str++)
66 if (!isspace(*str))
67 return 0;
68
69 return 1;
70}
71
11c2177f
PT
72enum patch_format {
73 PATCH_FORMAT_UNKNOWN = 0,
5ae41c79 74 PATCH_FORMAT_MBOX,
336108c1 75 PATCH_FORMAT_STGIT,
94cd175c 76 PATCH_FORMAT_STGIT_SERIES,
d9925d1a
EW
77 PATCH_FORMAT_HG,
78 PATCH_FORMAT_MBOXRD
11c2177f 79};
8c3bd9e2 80
4f1b6961
PT
81enum keep_type {
82 KEEP_FALSE = 0,
83 KEEP_TRUE, /* pass -k flag to git-mailinfo */
84 KEEP_NON_PATCH /* pass -b flag to git-mailinfo */
85};
86
9b646617
PT
87enum scissors_type {
88 SCISSORS_UNSET = -1,
89 SCISSORS_FALSE = 0, /* pass --no-scissors to git-mailinfo */
90 SCISSORS_TRUE /* pass --scissors to git-mailinfo */
91};
92
b5e82359
PT
93enum signoff_type {
94 SIGNOFF_FALSE = 0,
95 SIGNOFF_TRUE = 1,
96 SIGNOFF_EXPLICIT /* --signoff was set on the command-line */
97};
98
8c3bd9e2
PT
99struct am_state {
100 /* state directory path */
101 char *dir;
102
103 /* current and last patch numbers, 1-indexed */
104 int cur;
105 int last;
11c2177f 106
3e20dcf3
PT
107 /* commit metadata and message */
108 char *author_name;
109 char *author_email;
110 char *author_date;
111 char *msg;
112 size_t msg_len;
113
13b97ea5 114 /* when --rebasing, records the original commit the patch came from */
8c88769b 115 struct object_id orig_commit;
13b97ea5 116
11c2177f
PT
117 /* number of digits in patch filename */
118 int prec;
5d28cf78
PT
119
120 /* various operating modes and command line options */
7ff26832 121 int interactive;
84f3de28 122 int threeway;
5d28cf78 123 int quiet;
b5e82359 124 int signoff; /* enum signoff_type */
ef7ee16d 125 int utf8;
4f1b6961 126 int keep; /* enum keep_type */
702cbaad 127 int message_id;
9b646617 128 int scissors; /* enum scissors_type */
257e8cec 129 struct argv_array git_apply_opts;
2d83109a 130 const char *resolvemsg;
0cd4bcba 131 int committer_date_is_author_date;
f07adb62 132 int ignore_date;
f1cb96d6 133 int allow_rerere_autoupdate;
7e35dacb 134 const char *sign_commit;
35bdcc59 135 int rebasing;
8c3bd9e2
PT
136};
137
138/**
16d2676c 139 * Initializes am_state with the default values.
8c3bd9e2 140 */
16d2676c 141static void am_state_init(struct am_state *state)
8c3bd9e2 142{
7e35dacb
PT
143 int gpgsign;
144
8c3bd9e2
PT
145 memset(state, 0, sizeof(*state));
146
16d2676c 147 state->dir = git_pathdup("rebase-apply");
11c2177f
PT
148
149 state->prec = 4;
ef7ee16d 150
e97a5e76
RL
151 git_config_get_bool("am.threeway", &state->threeway);
152
ef7ee16d 153 state->utf8 = 1;
702cbaad
PT
154
155 git_config_get_bool("am.messageid", &state->message_id);
9b646617
PT
156
157 state->scissors = SCISSORS_UNSET;
257e8cec
PT
158
159 argv_array_init(&state->git_apply_opts);
7e35dacb
PT
160
161 if (!git_config_get_bool("commit.gpgsign", &gpgsign))
162 state->sign_commit = gpgsign ? "" : NULL;
8c3bd9e2
PT
163}
164
165/**
166 * Releases memory allocated by an am_state.
167 */
168static void am_state_release(struct am_state *state)
169{
170 free(state->dir);
3e20dcf3
PT
171 free(state->author_name);
172 free(state->author_email);
173 free(state->author_date);
174 free(state->msg);
257e8cec 175 argv_array_clear(&state->git_apply_opts);
8c3bd9e2
PT
176}
177
178/**
179 * Returns path relative to the am_state directory.
180 */
181static inline const char *am_path(const struct am_state *state, const char *path)
182{
183 return mkpath("%s/%s", state->dir, path);
184}
185
25b763ba
JH
186/**
187 * For convenience to call write_file()
188 */
1dad879a
RS
189static void write_state_text(const struct am_state *state,
190 const char *name, const char *string)
25b763ba 191{
1dad879a 192 write_file(am_path(state, name), "%s", string);
25b763ba
JH
193}
194
1dad879a
RS
195static void write_state_count(const struct am_state *state,
196 const char *name, int value)
25b763ba 197{
1dad879a 198 write_file(am_path(state, name), "%d", value);
25b763ba
JH
199}
200
1dad879a
RS
201static void write_state_bool(const struct am_state *state,
202 const char *name, int value)
25b763ba 203{
1dad879a 204 write_state_text(state, name, value ? "t" : "f");
25b763ba
JH
205}
206
5d28cf78
PT
207/**
208 * If state->quiet is false, calls fprintf(fp, fmt, ...), and appends a newline
209 * at the end.
210 */
211static void say(const struct am_state *state, FILE *fp, const char *fmt, ...)
212{
213 va_list ap;
214
215 va_start(ap, fmt);
216 if (!state->quiet) {
217 vfprintf(fp, fmt, ap);
218 putc('\n', fp);
219 }
220 va_end(ap);
221}
222
8c3bd9e2
PT
223/**
224 * Returns 1 if there is an am session in progress, 0 otherwise.
225 */
226static int am_in_progress(const struct am_state *state)
227{
228 struct stat st;
229
230 if (lstat(state->dir, &st) < 0 || !S_ISDIR(st.st_mode))
231 return 0;
232 if (lstat(am_path(state, "last"), &st) || !S_ISREG(st.st_mode))
233 return 0;
234 if (lstat(am_path(state, "next"), &st) || !S_ISREG(st.st_mode))
235 return 0;
236 return 1;
237}
238
239/**
240 * Reads the contents of `file` in the `state` directory into `sb`. Returns the
241 * number of bytes read on success, -1 if the file does not exist. If `trim` is
242 * set, trailing whitespace will be removed.
243 */
244static int read_state_file(struct strbuf *sb, const struct am_state *state,
245 const char *file, int trim)
246{
247 strbuf_reset(sb);
248
249 if (strbuf_read_file(sb, am_path(state, file), 0) >= 0) {
250 if (trim)
251 strbuf_trim(sb);
252
253 return sb->len;
254 }
255
256 if (errno == ENOENT)
257 return -1;
258
259 die_errno(_("could not read '%s'"), am_path(state, file));
260}
261
3e20dcf3 262/**
a77598ef
JH
263 * Take a series of KEY='VALUE' lines where VALUE part is
264 * sq-quoted, and append <KEY, VALUE> at the end of the string list
3e20dcf3 265 */
a77598ef 266static int parse_key_value_squoted(char *buf, struct string_list *list)
3e20dcf3 267{
a77598ef
JH
268 while (*buf) {
269 struct string_list_item *item;
270 char *np;
271 char *cp = strchr(buf, '=');
272 if (!cp)
273 return -1;
274 np = strchrnul(cp, '\n');
275 *cp++ = '\0';
276 item = string_list_append(list, buf);
277
278 buf = np + (*np == '\n');
279 *np = '\0';
280 cp = sq_dequote(cp);
281 if (!cp)
282 return -1;
283 item->util = xstrdup(cp);
284 }
285 return 0;
3e20dcf3
PT
286}
287
288/**
289 * Reads and parses the state directory's "author-script" file, and sets
290 * state->author_name, state->author_email and state->author_date accordingly.
291 * Returns 0 on success, -1 if the file could not be parsed.
292 *
293 * The author script is of the format:
294 *
295 * GIT_AUTHOR_NAME='$author_name'
296 * GIT_AUTHOR_EMAIL='$author_email'
297 * GIT_AUTHOR_DATE='$author_date'
298 *
299 * where $author_name, $author_email and $author_date are quoted. We are strict
300 * with our parsing, as the file was meant to be eval'd in the old git-am.sh
301 * script, and thus if the file differs from what this function expects, it is
302 * better to bail out than to do something that the user does not expect.
303 */
304static int read_author_script(struct am_state *state)
305{
306 const char *filename = am_path(state, "author-script");
a77598ef
JH
307 struct strbuf buf = STRBUF_INIT;
308 struct string_list kv = STRING_LIST_INIT_DUP;
309 int retval = -1; /* assume failure */
310 int fd;
3e20dcf3
PT
311
312 assert(!state->author_name);
313 assert(!state->author_email);
314 assert(!state->author_date);
315
a77598ef
JH
316 fd = open(filename, O_RDONLY);
317 if (fd < 0) {
3e20dcf3
PT
318 if (errno == ENOENT)
319 return 0;
320 die_errno(_("could not open '%s' for reading"), filename);
321 }
a77598ef
JH
322 strbuf_read(&buf, fd, 0);
323 close(fd);
324 if (parse_key_value_squoted(buf.buf, &kv))
325 goto finish;
326
327 if (kv.nr != 3 ||
328 strcmp(kv.items[0].string, "GIT_AUTHOR_NAME") ||
329 strcmp(kv.items[1].string, "GIT_AUTHOR_EMAIL") ||
330 strcmp(kv.items[2].string, "GIT_AUTHOR_DATE"))
331 goto finish;
332 state->author_name = kv.items[0].util;
333 state->author_email = kv.items[1].util;
334 state->author_date = kv.items[2].util;
335 retval = 0;
336finish:
337 string_list_clear(&kv, !!retval);
338 strbuf_release(&buf);
339 return retval;
3e20dcf3
PT
340}
341
342/**
343 * Saves state->author_name, state->author_email and state->author_date in the
344 * state directory's "author-script" file.
345 */
346static void write_author_script(const struct am_state *state)
347{
348 struct strbuf sb = STRBUF_INIT;
349
350 strbuf_addstr(&sb, "GIT_AUTHOR_NAME=");
351 sq_quote_buf(&sb, state->author_name);
352 strbuf_addch(&sb, '\n');
353
354 strbuf_addstr(&sb, "GIT_AUTHOR_EMAIL=");
355 sq_quote_buf(&sb, state->author_email);
356 strbuf_addch(&sb, '\n');
357
358 strbuf_addstr(&sb, "GIT_AUTHOR_DATE=");
359 sq_quote_buf(&sb, state->author_date);
360 strbuf_addch(&sb, '\n');
361
25b763ba 362 write_state_text(state, "author-script", sb.buf);
3e20dcf3
PT
363
364 strbuf_release(&sb);
365}
366
367/**
368 * Reads the commit message from the state directory's "final-commit" file,
369 * setting state->msg to its contents and state->msg_len to the length of its
370 * contents in bytes.
371 *
372 * Returns 0 on success, -1 if the file does not exist.
373 */
374static int read_commit_msg(struct am_state *state)
375{
376 struct strbuf sb = STRBUF_INIT;
377
378 assert(!state->msg);
379
380 if (read_state_file(&sb, state, "final-commit", 0) < 0) {
381 strbuf_release(&sb);
382 return -1;
383 }
384
385 state->msg = strbuf_detach(&sb, &state->msg_len);
386 return 0;
387}
388
389/**
390 * Saves state->msg in the state directory's "final-commit" file.
391 */
392static void write_commit_msg(const struct am_state *state)
393{
3e20dcf3 394 const char *filename = am_path(state, "final-commit");
e78d5d49 395 write_file_buf(filename, state->msg, state->msg_len);
3e20dcf3
PT
396}
397
8c3bd9e2
PT
398/**
399 * Loads state from disk.
400 */
401static void am_load(struct am_state *state)
402{
403 struct strbuf sb = STRBUF_INIT;
404
405 if (read_state_file(&sb, state, "next", 1) < 0)
406 die("BUG: state file 'next' does not exist");
407 state->cur = strtol(sb.buf, NULL, 10);
408
409 if (read_state_file(&sb, state, "last", 1) < 0)
410 die("BUG: state file 'last' does not exist");
411 state->last = strtol(sb.buf, NULL, 10);
412
3e20dcf3
PT
413 if (read_author_script(state) < 0)
414 die(_("could not parse author script"));
415
416 read_commit_msg(state);
417
13b97ea5 418 if (read_state_file(&sb, state, "original-commit", 1) < 0)
8c88769b 419 oidclr(&state->orig_commit);
420 else if (get_oid_hex(sb.buf, &state->orig_commit) < 0)
13b97ea5
PT
421 die(_("could not parse %s"), am_path(state, "original-commit"));
422
84f3de28
PT
423 read_state_file(&sb, state, "threeway", 1);
424 state->threeway = !strcmp(sb.buf, "t");
425
5d28cf78
PT
426 read_state_file(&sb, state, "quiet", 1);
427 state->quiet = !strcmp(sb.buf, "t");
428
eb898b83
PT
429 read_state_file(&sb, state, "sign", 1);
430 state->signoff = !strcmp(sb.buf, "t");
431
ef7ee16d
PT
432 read_state_file(&sb, state, "utf8", 1);
433 state->utf8 = !strcmp(sb.buf, "t");
434
fd4a3f48
PW
435 if (file_exists(am_path(state, "rerere-autoupdate"))) {
436 read_state_file(&sb, state, "rerere-autoupdate", 1);
437 state->allow_rerere_autoupdate = strcmp(sb.buf, "t") ?
438 RERERE_NOAUTOUPDATE : RERERE_AUTOUPDATE;
439 } else {
440 state->allow_rerere_autoupdate = 0;
441 }
442
4f1b6961
PT
443 read_state_file(&sb, state, "keep", 1);
444 if (!strcmp(sb.buf, "t"))
445 state->keep = KEEP_TRUE;
446 else if (!strcmp(sb.buf, "b"))
447 state->keep = KEEP_NON_PATCH;
448 else
449 state->keep = KEEP_FALSE;
450
702cbaad
PT
451 read_state_file(&sb, state, "messageid", 1);
452 state->message_id = !strcmp(sb.buf, "t");
453
9b646617
PT
454 read_state_file(&sb, state, "scissors", 1);
455 if (!strcmp(sb.buf, "t"))
456 state->scissors = SCISSORS_TRUE;
457 else if (!strcmp(sb.buf, "f"))
458 state->scissors = SCISSORS_FALSE;
459 else
460 state->scissors = SCISSORS_UNSET;
461
257e8cec
PT
462 read_state_file(&sb, state, "apply-opt", 1);
463 argv_array_clear(&state->git_apply_opts);
464 if (sq_dequote_to_argv_array(sb.buf, &state->git_apply_opts) < 0)
465 die(_("could not parse %s"), am_path(state, "apply-opt"));
466
35bdcc59
PT
467 state->rebasing = !!file_exists(am_path(state, "rebasing"));
468
8c3bd9e2
PT
469 strbuf_release(&sb);
470}
471
472/**
473 * Removes the am_state directory, forcefully terminating the current am
474 * session.
475 */
476static void am_destroy(const struct am_state *state)
477{
478 struct strbuf sb = STRBUF_INIT;
479
480 strbuf_addstr(&sb, state->dir);
481 remove_dir_recursively(&sb, 0);
482 strbuf_release(&sb);
483}
484
b8803d8f
PT
485/**
486 * Runs applypatch-msg hook. Returns its exit code.
487 */
488static int run_applypatch_msg_hook(struct am_state *state)
489{
490 int ret;
491
492 assert(state->msg);
493 ret = run_hook_le(NULL, "applypatch-msg", am_path(state, "final-commit"), NULL);
494
495 if (!ret) {
6a83d902 496 FREE_AND_NULL(state->msg);
b8803d8f
PT
497 if (read_commit_msg(state) < 0)
498 die(_("'%s' was deleted by the applypatch-msg hook"),
499 am_path(state, "final-commit"));
500 }
501
502 return ret;
503}
504
13b97ea5
PT
505/**
506 * Runs post-rewrite hook. Returns it exit code.
507 */
508static int run_post_rewrite_hook(const struct am_state *state)
509{
510 struct child_process cp = CHILD_PROCESS_INIT;
511 const char *hook = find_hook("post-rewrite");
512 int ret;
513
514 if (!hook)
515 return 0;
516
517 argv_array_push(&cp.args, hook);
518 argv_array_push(&cp.args, "rebase");
519
520 cp.in = xopen(am_path(state, "rewritten"), O_RDONLY);
521 cp.stdout_to_stderr = 1;
522
523 ret = run_command(&cp);
524
525 close(cp.in);
526 return ret;
527}
528
88b291fe
PT
529/**
530 * Reads the state directory's "rewritten" file, and copies notes from the old
531 * commits listed in the file to their rewritten commits.
532 *
533 * Returns 0 on success, -1 on failure.
534 */
535static int copy_notes_for_rebase(const struct am_state *state)
536{
537 struct notes_rewrite_cfg *c;
538 struct strbuf sb = STRBUF_INIT;
539 const char *invalid_line = _("Malformed input line: '%s'.");
540 const char *msg = "Notes added by 'git rebase'";
541 FILE *fp;
542 int ret = 0;
543
544 assert(state->rebasing);
545
546 c = init_copy_notes_for_rewrite("rebase");
547 if (!c)
548 return 0;
549
550 fp = xfopen(am_path(state, "rewritten"), "r");
551
8f309aeb 552 while (!strbuf_getline_lf(&sb, fp)) {
8c88769b 553 struct object_id from_obj, to_obj;
88b291fe
PT
554
555 if (sb.len != GIT_SHA1_HEXSZ * 2 + 1) {
556 ret = error(invalid_line, sb.buf);
557 goto finish;
558 }
559
8c88769b 560 if (get_oid_hex(sb.buf, &from_obj)) {
88b291fe
PT
561 ret = error(invalid_line, sb.buf);
562 goto finish;
563 }
564
565 if (sb.buf[GIT_SHA1_HEXSZ] != ' ') {
566 ret = error(invalid_line, sb.buf);
567 goto finish;
568 }
569
8c88769b 570 if (get_oid_hex(sb.buf + GIT_SHA1_HEXSZ + 1, &to_obj)) {
88b291fe
PT
571 ret = error(invalid_line, sb.buf);
572 goto finish;
573 }
574
bb7e4739 575 if (copy_note_for_rewrite(c, &from_obj, &to_obj))
88b291fe 576 ret = error(_("Failed to copy notes from '%s' to '%s'"),
8c88769b 577 oid_to_hex(&from_obj), oid_to_hex(&to_obj));
88b291fe
PT
578 }
579
580finish:
581 finish_copy_notes_for_rewrite(c, msg);
582 fclose(fp);
583 strbuf_release(&sb);
584 return ret;
585}
586
c29807b2
PT
587/**
588 * Determines if the file looks like a piece of RFC2822 mail by grabbing all
589 * non-indented lines and checking if they look like they begin with valid
590 * header field names.
591 *
592 * Returns 1 if the file looks like a piece of mail, 0 otherwise.
593 */
594static int is_mail(FILE *fp)
595{
596 const char *header_regex = "^[!-9;-~]+:";
597 struct strbuf sb = STRBUF_INIT;
598 regex_t regex;
599 int ret = 1;
600
601 if (fseek(fp, 0L, SEEK_SET))
602 die_errno(_("fseek failed"));
603
604 if (regcomp(&regex, header_regex, REG_NOSUB | REG_EXTENDED))
605 die("invalid pattern: %s", header_regex);
606
1a0c8dfd 607 while (!strbuf_getline(&sb, fp)) {
c29807b2
PT
608 if (!sb.len)
609 break; /* End of header */
610
611 /* Ignore indented folded lines */
612 if (*sb.buf == '\t' || *sb.buf == ' ')
613 continue;
614
615 /* It's a header if it matches header_regex */
616 if (regexec(&regex, sb.buf, 0, NULL, 0)) {
617 ret = 0;
618 goto done;
619 }
620 }
621
622done:
623 regfree(&regex);
624 strbuf_release(&sb);
625 return ret;
626}
627
628/**
629 * Attempts to detect the patch_format of the patches contained in `paths`,
630 * returning the PATCH_FORMAT_* enum value. Returns PATCH_FORMAT_UNKNOWN if
631 * detection fails.
632 */
633static int detect_patch_format(const char **paths)
634{
635 enum patch_format ret = PATCH_FORMAT_UNKNOWN;
636 struct strbuf l1 = STRBUF_INIT;
5ae41c79
PT
637 struct strbuf l2 = STRBUF_INIT;
638 struct strbuf l3 = STRBUF_INIT;
c29807b2
PT
639 FILE *fp;
640
641 /*
642 * We default to mbox format if input is from stdin and for directories
643 */
644 if (!*paths || !strcmp(*paths, "-") || is_directory(*paths))
645 return PATCH_FORMAT_MBOX;
646
647 /*
648 * Otherwise, check the first few lines of the first patch, starting
649 * from the first non-blank line, to try to detect its format.
650 */
651
652 fp = xfopen(*paths, "r");
653
1a0c8dfd 654 while (!strbuf_getline(&l1, fp)) {
c29807b2
PT
655 if (l1.len)
656 break;
657 }
658
659 if (starts_with(l1.buf, "From ") || starts_with(l1.buf, "From: ")) {
660 ret = PATCH_FORMAT_MBOX;
661 goto done;
662 }
663
336108c1
PT
664 if (starts_with(l1.buf, "# This series applies on GIT commit")) {
665 ret = PATCH_FORMAT_STGIT_SERIES;
666 goto done;
667 }
668
94cd175c
PT
669 if (!strcmp(l1.buf, "# HG changeset patch")) {
670 ret = PATCH_FORMAT_HG;
671 goto done;
672 }
673
1a0c8dfd 674 strbuf_getline(&l2, fp);
1a0c8dfd 675 strbuf_getline(&l3, fp);
5ae41c79
PT
676
677 /*
678 * If the second line is empty and the third is a From, Author or Date
679 * entry, this is likely an StGit patch.
680 */
681 if (l1.len && !l2.len &&
682 (starts_with(l3.buf, "From:") ||
683 starts_with(l3.buf, "Author:") ||
684 starts_with(l3.buf, "Date:"))) {
685 ret = PATCH_FORMAT_STGIT;
686 goto done;
687 }
688
c29807b2
PT
689 if (l1.len && is_mail(fp)) {
690 ret = PATCH_FORMAT_MBOX;
691 goto done;
692 }
693
694done:
695 fclose(fp);
696 strbuf_release(&l1);
542627a4
RS
697 strbuf_release(&l2);
698 strbuf_release(&l3);
c29807b2
PT
699 return ret;
700}
701
11c2177f
PT
702/**
703 * Splits out individual email patches from `paths`, where each path is either
704 * a mbox file or a Maildir. Returns 0 on success, -1 on failure.
705 */
d9925d1a
EW
706static int split_mail_mbox(struct am_state *state, const char **paths,
707 int keep_cr, int mboxrd)
11c2177f
PT
708{
709 struct child_process cp = CHILD_PROCESS_INIT;
710 struct strbuf last = STRBUF_INIT;
1b090735 711 int ret;
11c2177f
PT
712
713 cp.git_cmd = 1;
714 argv_array_push(&cp.args, "mailsplit");
715 argv_array_pushf(&cp.args, "-d%d", state->prec);
716 argv_array_pushf(&cp.args, "-o%s", state->dir);
717 argv_array_push(&cp.args, "-b");
5d123a40
PT
718 if (keep_cr)
719 argv_array_push(&cp.args, "--keep-cr");
d9925d1a
EW
720 if (mboxrd)
721 argv_array_push(&cp.args, "--mboxrd");
11c2177f
PT
722 argv_array_push(&cp.args, "--");
723 argv_array_pushv(&cp.args, paths);
724
1b090735
RS
725 ret = capture_command(&cp, &last, 8);
726 if (ret)
727 goto exit;
11c2177f
PT
728
729 state->cur = 1;
730 state->last = strtol(last.buf, NULL, 10);
731
1b090735
RS
732exit:
733 strbuf_release(&last);
734 return ret ? -1 : 0;
11c2177f
PT
735}
736
5ae41c79
PT
737/**
738 * Callback signature for split_mail_conv(). The foreign patch should be
739 * read from `in`, and the converted patch (in RFC2822 mail format) should be
740 * written to `out`. Return 0 on success, or -1 on failure.
741 */
742typedef int (*mail_conv_fn)(FILE *out, FILE *in, int keep_cr);
743
744/**
745 * Calls `fn` for each file in `paths` to convert the foreign patch to the
746 * RFC2822 mail format suitable for parsing with git-mailinfo.
747 *
748 * Returns 0 on success, -1 on failure.
749 */
750static int split_mail_conv(mail_conv_fn fn, struct am_state *state,
751 const char **paths, int keep_cr)
752{
753 static const char *stdin_only[] = {"-", NULL};
754 int i;
755
756 if (!*paths)
757 paths = stdin_only;
758
759 for (i = 0; *paths; paths++, i++) {
760 FILE *in, *out;
761 const char *mail;
762 int ret;
763
764 if (!strcmp(*paths, "-"))
765 in = stdin;
766 else
767 in = fopen(*paths, "r");
768
769 if (!in)
6e59e9c0
NTND
770 return error_errno(_("could not open '%s' for reading"),
771 *paths);
5ae41c79
PT
772
773 mail = mkpath("%s/%0*d", state->dir, state->prec, i + 1);
774
775 out = fopen(mail, "w");
ac8ce18d
RS
776 if (!out) {
777 if (in != stdin)
778 fclose(in);
6e59e9c0
NTND
779 return error_errno(_("could not open '%s' for writing"),
780 mail);
ac8ce18d 781 }
5ae41c79
PT
782
783 ret = fn(out, in, keep_cr);
784
785 fclose(out);
ac8ce18d
RS
786 if (in != stdin)
787 fclose(in);
5ae41c79
PT
788
789 if (ret)
790 return error(_("could not parse patch '%s'"), *paths);
791 }
792
793 state->cur = 1;
794 state->last = i;
795 return 0;
796}
797
798/**
799 * A split_mail_conv() callback that converts an StGit patch to an RFC2822
800 * message suitable for parsing with git-mailinfo.
801 */
802static int stgit_patch_to_mail(FILE *out, FILE *in, int keep_cr)
803{
804 struct strbuf sb = STRBUF_INIT;
805 int subject_printed = 0;
806
8f309aeb 807 while (!strbuf_getline_lf(&sb, in)) {
5ae41c79
PT
808 const char *str;
809
810 if (str_isspace(sb.buf))
811 continue;
812 else if (skip_prefix(sb.buf, "Author:", &str))
813 fprintf(out, "From:%s\n", str);
814 else if (starts_with(sb.buf, "From") || starts_with(sb.buf, "Date"))
815 fprintf(out, "%s\n", sb.buf);
816 else if (!subject_printed) {
817 fprintf(out, "Subject: %s\n", sb.buf);
818 subject_printed = 1;
819 } else {
820 fprintf(out, "\n%s\n", sb.buf);
821 break;
822 }
823 }
824
825 strbuf_reset(&sb);
826 while (strbuf_fread(&sb, 8192, in) > 0) {
827 fwrite(sb.buf, 1, sb.len, out);
828 strbuf_reset(&sb);
829 }
830
831 strbuf_release(&sb);
832 return 0;
833}
834
336108c1
PT
835/**
836 * This function only supports a single StGit series file in `paths`.
837 *
838 * Given an StGit series file, converts the StGit patches in the series into
839 * RFC2822 messages suitable for parsing with git-mailinfo, and queues them in
840 * the state directory.
841 *
842 * Returns 0 on success, -1 on failure.
843 */
844static int split_mail_stgit_series(struct am_state *state, const char **paths,
845 int keep_cr)
846{
847 const char *series_dir;
848 char *series_dir_buf;
849 FILE *fp;
850 struct argv_array patches = ARGV_ARRAY_INIT;
851 struct strbuf sb = STRBUF_INIT;
852 int ret;
853
854 if (!paths[0] || paths[1])
855 return error(_("Only one StGIT patch series can be applied at once"));
856
857 series_dir_buf = xstrdup(*paths);
858 series_dir = dirname(series_dir_buf);
859
860 fp = fopen(*paths, "r");
861 if (!fp)
6e59e9c0 862 return error_errno(_("could not open '%s' for reading"), *paths);
336108c1 863
8f309aeb 864 while (!strbuf_getline_lf(&sb, fp)) {
336108c1
PT
865 if (*sb.buf == '#')
866 continue; /* skip comment lines */
867
868 argv_array_push(&patches, mkpath("%s/%s", series_dir, sb.buf));
869 }
870
871 fclose(fp);
872 strbuf_release(&sb);
873 free(series_dir_buf);
874
875 ret = split_mail_conv(stgit_patch_to_mail, state, patches.argv, keep_cr);
876
877 argv_array_clear(&patches);
878 return ret;
879}
880
94cd175c
PT
881/**
882 * A split_patches_conv() callback that converts a mercurial patch to a RFC2822
883 * message suitable for parsing with git-mailinfo.
884 */
885static int hg_patch_to_mail(FILE *out, FILE *in, int keep_cr)
886{
887 struct strbuf sb = STRBUF_INIT;
b36474ff 888 int rc = 0;
94cd175c 889
8f309aeb 890 while (!strbuf_getline_lf(&sb, in)) {
94cd175c
PT
891 const char *str;
892
893 if (skip_prefix(sb.buf, "# User ", &str))
894 fprintf(out, "From: %s\n", str);
895 else if (skip_prefix(sb.buf, "# Date ", &str)) {
dddbad72 896 timestamp_t timestamp;
94cd175c
PT
897 long tz, tz2;
898 char *end;
899
900 errno = 0;
1aeb7e75 901 timestamp = parse_timestamp(str, &end, 10);
b36474ff
RS
902 if (errno) {
903 rc = error(_("invalid timestamp"));
904 goto exit;
905 }
94cd175c 906
b36474ff
RS
907 if (!skip_prefix(end, " ", &str)) {
908 rc = error(_("invalid Date line"));
909 goto exit;
910 }
94cd175c
PT
911
912 errno = 0;
913 tz = strtol(str, &end, 10);
b36474ff
RS
914 if (errno) {
915 rc = error(_("invalid timezone offset"));
916 goto exit;
917 }
94cd175c 918
b36474ff
RS
919 if (*end) {
920 rc = error(_("invalid Date line"));
921 goto exit;
922 }
94cd175c
PT
923
924 /*
925 * mercurial's timezone is in seconds west of UTC,
926 * however git's timezone is in hours + minutes east of
927 * UTC. Convert it.
928 */
929 tz2 = labs(tz) / 3600 * 100 + labs(tz) % 3600 / 60;
930 if (tz > 0)
931 tz2 = -tz2;
932
933 fprintf(out, "Date: %s\n", show_date(timestamp, tz2, DATE_MODE(RFC2822)));
934 } else if (starts_with(sb.buf, "# ")) {
935 continue;
936 } else {
937 fprintf(out, "\n%s\n", sb.buf);
938 break;
939 }
940 }
941
942 strbuf_reset(&sb);
943 while (strbuf_fread(&sb, 8192, in) > 0) {
944 fwrite(sb.buf, 1, sb.len, out);
945 strbuf_reset(&sb);
946 }
b36474ff 947exit:
94cd175c 948 strbuf_release(&sb);
b36474ff 949 return rc;
94cd175c
PT
950}
951
11c2177f
PT
952/**
953 * Splits a list of files/directories into individual email patches. Each path
954 * in `paths` must be a file/directory that is formatted according to
955 * `patch_format`.
956 *
957 * Once split out, the individual email patches will be stored in the state
958 * directory, with each patch's filename being its index, padded to state->prec
959 * digits.
960 *
961 * state->cur will be set to the index of the first mail, and state->last will
962 * be set to the index of the last mail.
963 *
5d123a40
PT
964 * Set keep_cr to 0 to convert all lines ending with \r\n to end with \n, 1
965 * to disable this behavior, -1 to use the default configured setting.
966 *
11c2177f
PT
967 * Returns 0 on success, -1 on failure.
968 */
969static int split_mail(struct am_state *state, enum patch_format patch_format,
5d123a40 970 const char **paths, int keep_cr)
11c2177f 971{
5d123a40
PT
972 if (keep_cr < 0) {
973 keep_cr = 0;
974 git_config_get_bool("am.keepcr", &keep_cr);
975 }
976
11c2177f
PT
977 switch (patch_format) {
978 case PATCH_FORMAT_MBOX:
d9925d1a 979 return split_mail_mbox(state, paths, keep_cr, 0);
5ae41c79
PT
980 case PATCH_FORMAT_STGIT:
981 return split_mail_conv(stgit_patch_to_mail, state, paths, keep_cr);
336108c1
PT
982 case PATCH_FORMAT_STGIT_SERIES:
983 return split_mail_stgit_series(state, paths, keep_cr);
94cd175c
PT
984 case PATCH_FORMAT_HG:
985 return split_mail_conv(hg_patch_to_mail, state, paths, keep_cr);
d9925d1a
EW
986 case PATCH_FORMAT_MBOXRD:
987 return split_mail_mbox(state, paths, keep_cr, 1);
11c2177f
PT
988 default:
989 die("BUG: invalid patch_format");
990 }
991 return -1;
992}
993
8c3bd9e2
PT
994/**
995 * Setup a new am session for applying patches
996 */
11c2177f 997static void am_setup(struct am_state *state, enum patch_format patch_format,
5d123a40 998 const char **paths, int keep_cr)
8c3bd9e2 999{
8c88769b 1000 struct object_id curr_head;
4f1b6961 1001 const char *str;
257e8cec 1002 struct strbuf sb = STRBUF_INIT;
33388a71 1003
c29807b2
PT
1004 if (!patch_format)
1005 patch_format = detect_patch_format(paths);
1006
1007 if (!patch_format) {
1008 fprintf_ln(stderr, _("Patch format detection failed."));
1009 exit(128);
1010 }
1011
8c3bd9e2
PT
1012 if (mkdir(state->dir, 0777) < 0 && errno != EEXIST)
1013 die_errno(_("failed to create directory '%s'"), state->dir);
1014
5d123a40 1015 if (split_mail(state, patch_format, paths, keep_cr) < 0) {
11c2177f
PT
1016 am_destroy(state);
1017 die(_("Failed to split patches."));
1018 }
1019
35bdcc59
PT
1020 if (state->rebasing)
1021 state->threeway = 1;
1022
25b763ba
JH
1023 write_state_bool(state, "threeway", state->threeway);
1024 write_state_bool(state, "quiet", state->quiet);
1025 write_state_bool(state, "sign", state->signoff);
1026 write_state_bool(state, "utf8", state->utf8);
ef7ee16d 1027
fd4a3f48
PW
1028 if (state->allow_rerere_autoupdate)
1029 write_state_bool(state, "rerere-autoupdate",
1030 state->allow_rerere_autoupdate == RERERE_AUTOUPDATE);
1031
4f1b6961
PT
1032 switch (state->keep) {
1033 case KEEP_FALSE:
1034 str = "f";
1035 break;
1036 case KEEP_TRUE:
1037 str = "t";
1038 break;
1039 case KEEP_NON_PATCH:
1040 str = "b";
1041 break;
1042 default:
1043 die("BUG: invalid value for state->keep");
1044 }
1045
25b763ba
JH
1046 write_state_text(state, "keep", str);
1047 write_state_bool(state, "messageid", state->message_id);
702cbaad 1048
9b646617
PT
1049 switch (state->scissors) {
1050 case SCISSORS_UNSET:
1051 str = "";
1052 break;
1053 case SCISSORS_FALSE:
1054 str = "f";
1055 break;
1056 case SCISSORS_TRUE:
1057 str = "t";
1058 break;
1059 default:
1060 die("BUG: invalid value for state->scissors");
1061 }
25b763ba 1062 write_state_text(state, "scissors", str);
9b646617 1063
e35f11c2 1064 sq_quote_argv(&sb, state->git_apply_opts.argv);
25b763ba 1065 write_state_text(state, "apply-opt", sb.buf);
257e8cec 1066
35bdcc59 1067 if (state->rebasing)
25b763ba 1068 write_state_text(state, "rebasing", "");
35bdcc59 1069 else
25b763ba 1070 write_state_text(state, "applying", "");
35bdcc59 1071
8c88769b 1072 if (!get_oid("HEAD", &curr_head)) {
1073 write_state_text(state, "abort-safety", oid_to_hex(&curr_head));
35bdcc59 1074 if (!state->rebasing)
ae077771 1075 update_ref("am", "ORIG_HEAD", &curr_head, NULL, 0,
1076 UPDATE_REFS_DIE_ON_ERR);
33388a71 1077 } else {
25b763ba 1078 write_state_text(state, "abort-safety", "");
35bdcc59 1079 if (!state->rebasing)
755b49ae 1080 delete_ref(NULL, "ORIG_HEAD", NULL, 0);
33388a71
PT
1081 }
1082
8c3bd9e2
PT
1083 /*
1084 * NOTE: Since the "next" and "last" files determine if an am_state
1085 * session is in progress, they should be written last.
1086 */
1087
25b763ba
JH
1088 write_state_count(state, "next", state->cur);
1089 write_state_count(state, "last", state->last);
257e8cec
PT
1090
1091 strbuf_release(&sb);
8c3bd9e2
PT
1092}
1093
1094/**
1095 * Increments the patch pointer, and cleans am_state for the application of the
1096 * next patch.
1097 */
1098static void am_next(struct am_state *state)
1099{
8c88769b 1100 struct object_id head;
33388a71 1101
88ce3ef6
ÆAB
1102 FREE_AND_NULL(state->author_name);
1103 FREE_AND_NULL(state->author_email);
1104 FREE_AND_NULL(state->author_date);
1105 FREE_AND_NULL(state->msg);
3e20dcf3
PT
1106 state->msg_len = 0;
1107
1108 unlink(am_path(state, "author-script"));
1109 unlink(am_path(state, "final-commit"));
1110
8c88769b 1111 oidclr(&state->orig_commit);
13b97ea5
PT
1112 unlink(am_path(state, "original-commit"));
1113
8c88769b 1114 if (!get_oid("HEAD", &head))
1115 write_state_text(state, "abort-safety", oid_to_hex(&head));
33388a71 1116 else
25b763ba 1117 write_state_text(state, "abort-safety", "");
33388a71 1118
8c3bd9e2 1119 state->cur++;
25b763ba 1120 write_state_count(state, "next", state->cur);
8c3bd9e2
PT
1121}
1122
3e20dcf3
PT
1123/**
1124 * Returns the filename of the current patch email.
1125 */
1126static const char *msgnum(const struct am_state *state)
1127{
1128 static struct strbuf sb = STRBUF_INIT;
1129
1130 strbuf_reset(&sb);
1131 strbuf_addf(&sb, "%0*d", state->prec, state->cur);
1132
1133 return sb.buf;
1134}
1135
38a824fe
PT
1136/**
1137 * Refresh and write index.
1138 */
1139static void refresh_and_write_cache(void)
1140{
837e34eb 1141 struct lock_file lock_file = LOCK_INIT;
38a824fe 1142
837e34eb 1143 hold_locked_index(&lock_file, LOCK_DIE_ON_ERROR);
38a824fe 1144 refresh_cache(REFRESH_QUIET);
837e34eb 1145 if (write_locked_index(&the_index, &lock_file, COMMIT_LOCK))
38a824fe
PT
1146 die(_("unable to write index file"));
1147}
1148
2d83109a
PT
1149/**
1150 * Dies with a user-friendly message on how to proceed after resolving the
1151 * problem. This message can be overridden with state->resolvemsg.
1152 */
1153static void NORETURN die_user_resolve(const struct am_state *state)
1154{
1155 if (state->resolvemsg) {
1156 printf_ln("%s", state->resolvemsg);
1157 } else {
7ff26832 1158 const char *cmdline = state->interactive ? "git am -i" : "git am";
2d83109a
PT
1159
1160 printf_ln(_("When you have resolved this problem, run \"%s --continue\"."), cmdline);
1161 printf_ln(_("If you prefer to skip this patch, run \"%s --skip\" instead."), cmdline);
1162 printf_ln(_("To restore the original branch and stop patching, run \"%s --abort\"."), cmdline);
1163 }
1164
1165 exit(128);
1166}
1167
0fb3c4fc
GB
1168/**
1169 * Appends signoff to the "msg" field of the am_state.
1170 */
1171static void am_append_signoff(struct am_state *state)
aab84542 1172{
0fb3c4fc 1173 struct strbuf sb = STRBUF_INIT;
aab84542 1174
0fb3c4fc 1175 strbuf_attach(&sb, state->msg, state->msg_len, state->msg_len);
735285b4 1176 append_signoff(&sb, 0, 0);
b5e82359
PT
1177 state->msg = strbuf_detach(&sb, &state->msg_len);
1178}
1179
3e20dcf3
PT
1180/**
1181 * Parses `mail` using git-mailinfo, extracting its patch and authorship info.
1182 * state->msg will be set to the patch message. state->author_name,
1183 * state->author_email and state->author_date will be set to the patch author's
1184 * name, email and date respectively. The patch body will be written to the
1185 * state directory's "patch" file.
1186 *
1187 * Returns 1 if the patch should be skipped, 0 otherwise.
1188 */
1189static int parse_mail(struct am_state *state, const char *mail)
1190{
1191 FILE *fp;
3e20dcf3
PT
1192 struct strbuf sb = STRBUF_INIT;
1193 struct strbuf msg = STRBUF_INIT;
1194 struct strbuf author_name = STRBUF_INIT;
1195 struct strbuf author_date = STRBUF_INIT;
1196 struct strbuf author_email = STRBUF_INIT;
1197 int ret = 0;
4b98bae2 1198 struct mailinfo mi;
3e20dcf3 1199
4b98bae2 1200 setup_mailinfo(&mi);
3e20dcf3 1201
4b98bae2
JH
1202 if (state->utf8)
1203 mi.metainfo_charset = get_commit_output_encoding();
1204 else
1205 mi.metainfo_charset = NULL;
4f1b6961
PT
1206
1207 switch (state->keep) {
1208 case KEEP_FALSE:
1209 break;
1210 case KEEP_TRUE:
4b98bae2 1211 mi.keep_subject = 1;
4f1b6961
PT
1212 break;
1213 case KEEP_NON_PATCH:
4b98bae2 1214 mi.keep_non_patch_brackets_in_subject = 1;
4f1b6961
PT
1215 break;
1216 default:
1217 die("BUG: invalid value for state->keep");
1218 }
1219
702cbaad 1220 if (state->message_id)
4b98bae2 1221 mi.add_message_id = 1;
702cbaad 1222
9b646617
PT
1223 switch (state->scissors) {
1224 case SCISSORS_UNSET:
1225 break;
1226 case SCISSORS_FALSE:
4b98bae2 1227 mi.use_scissors = 0;
9b646617
PT
1228 break;
1229 case SCISSORS_TRUE:
4b98bae2 1230 mi.use_scissors = 1;
9b646617
PT
1231 break;
1232 default:
1233 die("BUG: invalid value for state->scissors");
1234 }
1235
23a9e071
NTND
1236 mi.input = xfopen(mail, "r");
1237 mi.output = xfopen(am_path(state, "info"), "w");
4b98bae2 1238 if (mailinfo(&mi, am_path(state, "msg"), am_path(state, "patch")))
3e20dcf3
PT
1239 die("could not parse patch");
1240
4b98bae2
JH
1241 fclose(mi.input);
1242 fclose(mi.output);
3e20dcf3
PT
1243
1244 /* Extract message and author information */
1245 fp = xfopen(am_path(state, "info"), "r");
8f309aeb 1246 while (!strbuf_getline_lf(&sb, fp)) {
3e20dcf3
PT
1247 const char *x;
1248
1249 if (skip_prefix(sb.buf, "Subject: ", &x)) {
1250 if (msg.len)
1251 strbuf_addch(&msg, '\n');
1252 strbuf_addstr(&msg, x);
1253 } else if (skip_prefix(sb.buf, "Author: ", &x))
1254 strbuf_addstr(&author_name, x);
1255 else if (skip_prefix(sb.buf, "Email: ", &x))
1256 strbuf_addstr(&author_email, x);
1257 else if (skip_prefix(sb.buf, "Date: ", &x))
1258 strbuf_addstr(&author_date, x);
1259 }
1260 fclose(fp);
1261
1262 /* Skip pine's internal folder data */
1263 if (!strcmp(author_name.buf, "Mail System Internal Data")) {
1264 ret = 1;
1265 goto finish;
1266 }
1267
1268 if (is_empty_file(am_path(state, "patch"))) {
6c486862 1269 printf_ln(_("Patch is empty."));
2d83109a 1270 die_user_resolve(state);
3e20dcf3
PT
1271 }
1272
1273 strbuf_addstr(&msg, "\n\n");
4b98bae2 1274 strbuf_addbuf(&msg, &mi.log_message);
63af4a84 1275 strbuf_stripspace(&msg, 0);
3e20dcf3
PT
1276
1277 assert(!state->author_name);
1278 state->author_name = strbuf_detach(&author_name, NULL);
1279
1280 assert(!state->author_email);
1281 state->author_email = strbuf_detach(&author_email, NULL);
1282
1283 assert(!state->author_date);
1284 state->author_date = strbuf_detach(&author_date, NULL);
1285
1286 assert(!state->msg);
1287 state->msg = strbuf_detach(&msg, &state->msg_len);
1288
1289finish:
1290 strbuf_release(&msg);
1291 strbuf_release(&author_date);
1292 strbuf_release(&author_email);
1293 strbuf_release(&author_name);
1294 strbuf_release(&sb);
4b98bae2 1295 clear_mailinfo(&mi);
3e20dcf3
PT
1296 return ret;
1297}
1298
df2760a5
PT
1299/**
1300 * Sets commit_id to the commit hash where the mail was generated from.
1301 * Returns 0 on success, -1 on failure.
1302 */
8c88769b 1303static int get_mail_commit_oid(struct object_id *commit_id, const char *mail)
df2760a5
PT
1304{
1305 struct strbuf sb = STRBUF_INIT;
1306 FILE *fp = xfopen(mail, "r");
1307 const char *x;
5b34ba41 1308 int ret = 0;
df2760a5 1309
5b34ba41
JS
1310 if (strbuf_getline_lf(&sb, fp) ||
1311 !skip_prefix(sb.buf, "From ", &x) ||
1312 get_oid_hex(x, commit_id) < 0)
1313 ret = -1;
df2760a5
PT
1314
1315 strbuf_release(&sb);
1316 fclose(fp);
5b34ba41 1317 return ret;
df2760a5
PT
1318}
1319
1320/**
1321 * Sets state->msg, state->author_name, state->author_email, state->author_date
1322 * to the commit's respective info.
1323 */
1324static void get_commit_info(struct am_state *state, struct commit *commit)
1325{
2e2bbb96 1326 const char *buffer, *ident_line, *msg;
df2760a5 1327 size_t ident_len;
721f5f1e 1328 struct ident_split id;
df2760a5
PT
1329
1330 buffer = logmsg_reencode(commit, NULL, get_commit_output_encoding());
1331
1332 ident_line = find_commit_header(buffer, "author", &ident_len);
1333
721f5f1e 1334 if (split_ident_line(&id, ident_line, ident_len) < 0)
2e2bbb96 1335 die(_("invalid ident line: %.*s"), (int)ident_len, ident_line);
df2760a5
PT
1336
1337 assert(!state->author_name);
721f5f1e 1338 if (id.name_begin)
2e2bbb96 1339 state->author_name =
721f5f1e
JK
1340 xmemdupz(id.name_begin, id.name_end - id.name_begin);
1341 else
df2760a5
PT
1342 state->author_name = xstrdup("");
1343
1344 assert(!state->author_email);
721f5f1e 1345 if (id.mail_begin)
2e2bbb96 1346 state->author_email =
721f5f1e
JK
1347 xmemdupz(id.mail_begin, id.mail_end - id.mail_begin);
1348 else
df2760a5
PT
1349 state->author_email = xstrdup("");
1350
df2760a5 1351 assert(!state->author_date);
721f5f1e 1352 state->author_date = xstrdup(show_ident_date(&id, DATE_MODE(NORMAL)));
df2760a5
PT
1353
1354 assert(!state->msg);
1355 msg = strstr(buffer, "\n\n");
1356 if (!msg)
f2fd0760 1357 die(_("unable to parse commit %s"), oid_to_hex(&commit->object.oid));
df2760a5
PT
1358 state->msg = xstrdup(msg + 2);
1359 state->msg_len = strlen(state->msg);
f131db9e 1360 unuse_commit_buffer(commit, buffer);
df2760a5
PT
1361}
1362
1363/**
1364 * Writes `commit` as a patch to the state directory's "patch" file.
1365 */
1366static void write_commit_patch(const struct am_state *state, struct commit *commit)
1367{
1368 struct rev_info rev_info;
1369 FILE *fp;
1370
1371 fp = xfopen(am_path(state, "patch"), "w");
1372 init_revisions(&rev_info, NULL);
1373 rev_info.diff = 1;
1374 rev_info.abbrev = 0;
1375 rev_info.disable_stdin = 1;
1376 rev_info.show_root_diff = 1;
1377 rev_info.diffopt.output_format = DIFF_FORMAT_PATCH;
1378 rev_info.no_commit_id = 1;
0d1e0e78
BW
1379 rev_info.diffopt.flags.binary = 1;
1380 rev_info.diffopt.flags.full_index = 1;
df2760a5
PT
1381 rev_info.diffopt.use_color = 0;
1382 rev_info.diffopt.file = fp;
1383 rev_info.diffopt.close_file = 1;
1384 add_pending_object(&rev_info, &commit->object, "");
1385 diff_setup_done(&rev_info.diffopt);
1386 log_tree_commit(&rev_info, commit);
1387}
1388
7ff26832
PT
1389/**
1390 * Writes the diff of the index against HEAD as a patch to the state
1391 * directory's "patch" file.
1392 */
1393static void write_index_patch(const struct am_state *state)
1394{
1395 struct tree *tree;
8c88769b 1396 struct object_id head;
7ff26832
PT
1397 struct rev_info rev_info;
1398 FILE *fp;
1399
e82caf38 1400 if (!get_oid_tree("HEAD", &head))
740ee055 1401 tree = lookup_tree(&head);
7ff26832 1402 else
eb0ccfd7 1403 tree = lookup_tree(the_hash_algo->empty_tree);
7ff26832
PT
1404
1405 fp = xfopen(am_path(state, "patch"), "w");
1406 init_revisions(&rev_info, NULL);
1407 rev_info.diff = 1;
1408 rev_info.disable_stdin = 1;
1409 rev_info.no_commit_id = 1;
1410 rev_info.diffopt.output_format = DIFF_FORMAT_PATCH;
1411 rev_info.diffopt.use_color = 0;
1412 rev_info.diffopt.file = fp;
1413 rev_info.diffopt.close_file = 1;
1414 add_pending_object(&rev_info, &tree->object, "");
1415 diff_setup_done(&rev_info.diffopt);
1416 run_diff_index(&rev_info, 1);
1417}
1418
df2760a5
PT
1419/**
1420 * Like parse_mail(), but parses the mail by looking up its commit ID
1421 * directly. This is used in --rebasing mode to bypass git-mailinfo's munging
1422 * of patches.
1423 *
13b97ea5
PT
1424 * state->orig_commit will be set to the original commit ID.
1425 *
df2760a5
PT
1426 * Will always return 0 as the patch should never be skipped.
1427 */
1428static int parse_mail_rebase(struct am_state *state, const char *mail)
1429{
1430 struct commit *commit;
8c88769b 1431 struct object_id commit_oid;
df2760a5 1432
8c88769b 1433 if (get_mail_commit_oid(&commit_oid, mail) < 0)
df2760a5
PT
1434 die(_("could not parse %s"), mail);
1435
bc83266a 1436 commit = lookup_commit_or_die(&commit_oid, mail);
df2760a5
PT
1437
1438 get_commit_info(state, commit);
1439
1440 write_commit_patch(state, commit);
1441
8c88769b 1442 oidcpy(&state->orig_commit, &commit_oid);
1443 write_state_text(state, "original-commit", oid_to_hex(&commit_oid));
13b97ea5 1444
df2760a5
PT
1445 return 0;
1446}
1447
38a824fe 1448/**
84f3de28
PT
1449 * Applies current patch with git-apply. Returns 0 on success, -1 otherwise. If
1450 * `index_file` is not NULL, the patch will be applied to that index.
38a824fe 1451 */
84f3de28 1452static int run_apply(const struct am_state *state, const char *index_file)
38a824fe 1453{
edfac5eb
CC
1454 struct argv_array apply_paths = ARGV_ARRAY_INIT;
1455 struct argv_array apply_opts = ARGV_ARRAY_INIT;
1456 struct apply_state apply_state;
1457 int res, opts_left;
edfac5eb
CC
1458 int force_apply = 0;
1459 int options = 0;
1460
6d058c88 1461 if (init_apply_state(&apply_state, NULL))
edfac5eb
CC
1462 die("BUG: init_apply_state() failed");
1463
1464 argv_array_push(&apply_opts, "apply");
1465 argv_array_pushv(&apply_opts, state->git_apply_opts.argv);
1466
1467 opts_left = apply_parse_options(apply_opts.argc, apply_opts.argv,
1468 &apply_state, &force_apply, &options,
1469 NULL);
1470
1471 if (opts_left != 0)
1472 die("unknown option passed through to git apply");
1473
1474 if (index_file) {
1475 apply_state.index_file = index_file;
1476 apply_state.cached = 1;
1477 } else
1478 apply_state.check_index = 1;
84f3de28
PT
1479
1480 /*
1481 * If we are allowed to fall back on 3-way merge, don't give false
1482 * errors during the initial attempt.
1483 */
edfac5eb
CC
1484 if (state->threeway && !index_file)
1485 apply_state.apply_verbosity = verbosity_silent;
84f3de28 1486
edfac5eb
CC
1487 if (check_apply_state(&apply_state, force_apply))
1488 die("BUG: check_apply_state() failed");
84f3de28 1489
edfac5eb 1490 argv_array_push(&apply_paths, am_path(state, "patch"));
257e8cec 1491
edfac5eb 1492 res = apply_all_patches(&apply_state, apply_paths.argc, apply_paths.argv, options);
84f3de28 1493
edfac5eb
CC
1494 argv_array_clear(&apply_paths);
1495 argv_array_clear(&apply_opts);
1496 clear_apply_state(&apply_state);
38a824fe 1497
edfac5eb
CC
1498 if (res)
1499 return res;
38a824fe 1500
edfac5eb
CC
1501 if (index_file) {
1502 /* Reload index as apply_all_patches() will have modified it. */
1503 discard_cache();
1504 read_cache_from(index_file);
1505 }
84f3de28
PT
1506
1507 return 0;
1508}
1509
1510/**
1511 * Builds an index that contains just the blobs needed for a 3way merge.
1512 */
1513static int build_fake_ancestor(const struct am_state *state, const char *index_file)
1514{
1515 struct child_process cp = CHILD_PROCESS_INIT;
1516
1517 cp.git_cmd = 1;
1518 argv_array_push(&cp.args, "apply");
257e8cec 1519 argv_array_pushv(&cp.args, state->git_apply_opts.argv);
84f3de28
PT
1520 argv_array_pushf(&cp.args, "--build-fake-ancestor=%s", index_file);
1521 argv_array_push(&cp.args, am_path(state, "patch"));
1522
1523 if (run_command(&cp))
1524 return -1;
1525
1526 return 0;
1527}
1528
1529/**
1530 * Attempt a threeway merge, using index_path as the temporary index.
1531 */
1532static int fall_back_threeway(const struct am_state *state, const char *index_path)
1533{
3f338f43
JS
1534 struct object_id orig_tree, their_tree, our_tree;
1535 const struct object_id *bases[1] = { &orig_tree };
1536 struct merge_options o;
1537 struct commit *result;
1538 char *their_tree_name;
84f3de28 1539
3f338f43
JS
1540 if (get_oid("HEAD", &our_tree) < 0)
1541 hashcpy(our_tree.hash, EMPTY_TREE_SHA1_BIN);
84f3de28
PT
1542
1543 if (build_fake_ancestor(state, index_path))
1544 return error("could not build fake ancestor");
1545
1546 discard_cache();
1547 read_cache_from(index_path);
1548
3f338f43 1549 if (write_index_as_tree(orig_tree.hash, &the_index, index_path, 0, NULL))
84f3de28
PT
1550 return error(_("Repository lacks necessary blobs to fall back on 3-way merge."));
1551
1552 say(state, stdout, _("Using index info to reconstruct a base tree..."));
1553
1554 if (!state->quiet) {
1555 /*
1556 * List paths that needed 3-way fallback, so that the user can
1557 * review them with extra care to spot mismerges.
1558 */
1559 struct rev_info rev_info;
1560 const char *diff_filter_str = "--diff-filter=AM";
1561
1562 init_revisions(&rev_info, NULL);
1563 rev_info.diffopt.output_format = DIFF_FORMAT_NAME_STATUS;
a97262c6 1564 diff_opt_parse(&rev_info.diffopt, &diff_filter_str, 1, rev_info.prefix);
a58a1b01 1565 add_pending_oid(&rev_info, "HEAD", &our_tree, 0);
84f3de28
PT
1566 diff_setup_done(&rev_info.diffopt);
1567 run_diff_index(&rev_info, 1);
1568 }
1569
1570 if (run_apply(state, index_path))
1571 return error(_("Did you hand edit your patch?\n"
1572 "It does not apply to blobs recorded in its index."));
1573
3f338f43 1574 if (write_index_as_tree(their_tree.hash, &the_index, index_path, 0, NULL))
84f3de28
PT
1575 return error("could not write tree");
1576
1577 say(state, stdout, _("Falling back to patching base and 3-way merge..."));
1578
38a824fe
PT
1579 discard_cache();
1580 read_cache();
1581
84f3de28
PT
1582 /*
1583 * This is not so wrong. Depending on which base we picked, orig_tree
715a51bc 1584 * may be wildly different from ours, but their_tree has the same set of
84f3de28
PT
1585 * wildly different changes in parts the patch did not touch, so
1586 * recursive ends up canceling them, saying that we reverted all those
1587 * changes.
1588 */
1589
3f338f43
JS
1590 init_merge_options(&o);
1591
1592 o.branch1 = "HEAD";
1593 their_tree_name = xstrfmt("%.*s", linelen(state->msg), state->msg);
1594 o.branch2 = their_tree_name;
1595
1596 if (state->quiet)
1597 o.verbosity = 0;
1598
1599 if (merge_recursive_generic(&o, &our_tree, &their_tree, 1, bases, &result)) {
f1cb96d6 1600 rerere(state->allow_rerere_autoupdate);
3f338f43 1601 free(their_tree_name);
84f3de28
PT
1602 return error(_("Failed to merge in the changes."));
1603 }
1604
3f338f43 1605 free(their_tree_name);
38a824fe
PT
1606 return 0;
1607}
1608
c9e8d960
PT
1609/**
1610 * Commits the current index with state->msg as the commit message and
1611 * state->author_name, state->author_email and state->author_date as the author
1612 * information.
1613 */
1614static void do_commit(const struct am_state *state)
1615{
8c88769b 1616 struct object_id tree, parent, commit;
1617 const struct object_id *old_oid;
c9e8d960
PT
1618 struct commit_list *parents = NULL;
1619 const char *reflog_msg, *author;
1620 struct strbuf sb = STRBUF_INIT;
1621
6c24c5c0
PT
1622 if (run_hook_le(NULL, "pre-applypatch", NULL))
1623 exit(1);
1624
8c88769b 1625 if (write_cache_as_tree(tree.hash, 0, NULL))
c9e8d960
PT
1626 die(_("git write-tree failed to write a tree"));
1627
e82caf38 1628 if (!get_oid_commit("HEAD", &parent)) {
8c88769b 1629 old_oid = &parent;
bc83266a 1630 commit_list_insert(lookup_commit(&parent), &parents);
c9e8d960 1631 } else {
8c88769b 1632 old_oid = NULL;
5d28cf78 1633 say(state, stderr, _("applying to an empty history"));
c9e8d960
PT
1634 }
1635
1636 author = fmt_ident(state->author_name, state->author_email,
f07adb62
PT
1637 state->ignore_date ? NULL : state->author_date,
1638 IDENT_STRICT);
c9e8d960 1639
0cd4bcba
PT
1640 if (state->committer_date_is_author_date)
1641 setenv("GIT_COMMITTER_DATE",
1642 state->ignore_date ? "" : state->author_date, 1);
1643
8c88769b 1644 if (commit_tree(state->msg, state->msg_len, tree.hash, parents, commit.hash,
7e35dacb 1645 author, state->sign_commit))
c9e8d960
PT
1646 die(_("failed to write commit object"));
1647
1648 reflog_msg = getenv("GIT_REFLOG_ACTION");
1649 if (!reflog_msg)
1650 reflog_msg = "am";
1651
1652 strbuf_addf(&sb, "%s: %.*s", reflog_msg, linelen(state->msg),
1653 state->msg);
1654
ae077771 1655 update_ref(sb.buf, "HEAD", &commit, old_oid, 0,
1656 UPDATE_REFS_DIE_ON_ERR);
c9e8d960 1657
13b97ea5
PT
1658 if (state->rebasing) {
1659 FILE *fp = xfopen(am_path(state, "rewritten"), "a");
1660
8c88769b 1661 assert(!is_null_oid(&state->orig_commit));
1662 fprintf(fp, "%s ", oid_to_hex(&state->orig_commit));
1663 fprintf(fp, "%s\n", oid_to_hex(&commit));
13b97ea5
PT
1664 fclose(fp);
1665 }
1666
7088f807
PT
1667 run_hook_le(NULL, "post-applypatch", NULL);
1668
c9e8d960
PT
1669 strbuf_release(&sb);
1670}
1671
240bfd2d
PT
1672/**
1673 * Validates the am_state for resuming -- the "msg" and authorship fields must
1674 * be filled up.
1675 */
1676static void validate_resume_state(const struct am_state *state)
1677{
1678 if (!state->msg)
1679 die(_("cannot resume: %s does not exist."),
1680 am_path(state, "final-commit"));
1681
1682 if (!state->author_name || !state->author_email || !state->author_date)
1683 die(_("cannot resume: %s does not exist."),
1684 am_path(state, "author-script"));
1685}
1686
7ff26832
PT
1687/**
1688 * Interactively prompt the user on whether the current patch should be
1689 * applied.
1690 *
1691 * Returns 0 if the user chooses to apply the patch, 1 if the user chooses to
1692 * skip it.
1693 */
1694static int do_interactive(struct am_state *state)
1695{
1696 assert(state->msg);
1697
1698 if (!isatty(0))
1699 die(_("cannot be interactive without stdin connected to a terminal."));
1700
1701 for (;;) {
1702 const char *reply;
1703
1704 puts(_("Commit Body is:"));
1705 puts("--------------------------");
1706 printf("%s", state->msg);
1707 puts("--------------------------");
1708
1709 /*
1710 * TRANSLATORS: Make sure to include [y], [n], [e], [v] and [a]
1711 * in your translation. The program will only accept English
1712 * input at this point.
1713 */
1714 reply = git_prompt(_("Apply? [y]es/[n]o/[e]dit/[v]iew patch/[a]ccept all: "), PROMPT_ECHO);
1715
1716 if (!reply) {
1717 continue;
1718 } else if (*reply == 'y' || *reply == 'Y') {
1719 return 0;
1720 } else if (*reply == 'a' || *reply == 'A') {
1721 state->interactive = 0;
1722 return 0;
1723 } else if (*reply == 'n' || *reply == 'N') {
1724 return 1;
1725 } else if (*reply == 'e' || *reply == 'E') {
1726 struct strbuf msg = STRBUF_INIT;
1727
1728 if (!launch_editor(am_path(state, "final-commit"), &msg, NULL)) {
1729 free(state->msg);
1730 state->msg = strbuf_detach(&msg, &state->msg_len);
1731 }
1732 strbuf_release(&msg);
1733 } else if (*reply == 'v' || *reply == 'V') {
1734 const char *pager = git_pager(1);
1735 struct child_process cp = CHILD_PROCESS_INIT;
1736
1737 if (!pager)
1738 pager = "cat";
708b8cc9 1739 prepare_pager_args(&cp, pager);
7ff26832
PT
1740 argv_array_push(&cp.args, am_path(state, "patch"));
1741 run_command(&cp);
1742 }
1743 }
1744}
1745
8c3bd9e2
PT
1746/**
1747 * Applies all queued mail.
8c7b1563
PT
1748 *
1749 * If `resume` is true, we are "resuming". The "msg" and authorship fields, as
1750 * well as the state directory's "patch" file is used as-is for applying the
1751 * patch and committing it.
8c3bd9e2 1752 */
8c7b1563 1753static void am_run(struct am_state *state, int resume)
8c3bd9e2 1754{
c9e8d960 1755 const char *argv_gc_auto[] = {"gc", "--auto", NULL};
32a5fcbf 1756 struct strbuf sb = STRBUF_INIT;
c9e8d960 1757
33388a71
PT
1758 unlink(am_path(state, "dirtyindex"));
1759
38a824fe
PT
1760 refresh_and_write_cache();
1761
33388a71 1762 if (index_has_changes(&sb)) {
25b763ba 1763 write_state_bool(state, "dirtyindex", 1);
32a5fcbf 1764 die(_("Dirty index: cannot apply patches (dirty: %s)"), sb.buf);
33388a71 1765 }
32a5fcbf
PT
1766
1767 strbuf_release(&sb);
1768
8c3bd9e2 1769 while (state->cur <= state->last) {
3e20dcf3 1770 const char *mail = am_path(state, msgnum(state));
84f3de28 1771 int apply_status;
3e20dcf3 1772
4d9c7e6f
JK
1773 reset_ident_date();
1774
3e20dcf3
PT
1775 if (!file_exists(mail))
1776 goto next;
1777
8c7b1563
PT
1778 if (resume) {
1779 validate_resume_state(state);
8c7b1563 1780 } else {
df2760a5
PT
1781 int skip;
1782
1783 if (state->rebasing)
1784 skip = parse_mail_rebase(state, mail);
1785 else
1786 skip = parse_mail(state, mail);
1787
1788 if (skip)
8c7b1563 1789 goto next; /* mail should be skipped */
3e20dcf3 1790
b7cc7051
GB
1791 if (state->signoff)
1792 am_append_signoff(state);
1793
8c7b1563
PT
1794 write_author_script(state);
1795 write_commit_msg(state);
1796 }
8c3bd9e2 1797
7ff26832
PT
1798 if (state->interactive && do_interactive(state))
1799 goto next;
1800
b8803d8f
PT
1801 if (run_applypatch_msg_hook(state))
1802 exit(1);
1803
5d28cf78 1804 say(state, stdout, _("Applying: %.*s"), linelen(state->msg), state->msg);
38a824fe 1805
84f3de28
PT
1806 apply_status = run_apply(state, NULL);
1807
1808 if (apply_status && state->threeway) {
1809 struct strbuf sb = STRBUF_INIT;
1810
1811 strbuf_addstr(&sb, am_path(state, "patch-merge-index"));
1812 apply_status = fall_back_threeway(state, sb.buf);
1813 strbuf_release(&sb);
1814
1815 /*
1816 * Applying the patch to an earlier tree and merging
1817 * the result may have produced the same tree as ours.
1818 */
1819 if (!apply_status && !index_has_changes(NULL)) {
1820 say(state, stdout, _("No changes -- Patch already applied."));
1821 goto next;
1822 }
1823 }
1824
1825 if (apply_status) {
38a824fe
PT
1826 int advice_amworkdir = 1;
1827
1828 printf_ln(_("Patch failed at %s %.*s"), msgnum(state),
1829 linelen(state->msg), state->msg);
1830
1831 git_config_get_bool("advice.amworkdir", &advice_amworkdir);
1832
1833 if (advice_amworkdir)
1834 printf_ln(_("The copy of the patch that failed is found in: %s"),
1835 am_path(state, "patch"));
1836
2d83109a 1837 die_user_resolve(state);
38a824fe
PT
1838 }
1839
c9e8d960 1840 do_commit(state);
8c3bd9e2 1841
3e20dcf3 1842next:
8c3bd9e2 1843 am_next(state);
852a1710
PT
1844
1845 if (resume)
1846 am_load(state);
1847 resume = 0;
8c3bd9e2
PT
1848 }
1849
13b97ea5
PT
1850 if (!is_empty_file(am_path(state, "rewritten"))) {
1851 assert(state->rebasing);
88b291fe 1852 copy_notes_for_rebase(state);
13b97ea5
PT
1853 run_post_rewrite_hook(state);
1854 }
1855
35bdcc59
PT
1856 /*
1857 * In rebasing mode, it's up to the caller to take care of
1858 * housekeeping.
1859 */
1860 if (!state->rebasing) {
1861 am_destroy(state);
df617b52 1862 close_all_packs();
35bdcc59
PT
1863 run_command_v_opt(argv_gc_auto, RUN_GIT_CMD);
1864 }
8c3bd9e2 1865}
73c2779f 1866
240bfd2d
PT
1867/**
1868 * Resume the current am session after patch application failure. The user did
1869 * all the hard work, and we do not have to do any patch application. Just
1870 * trust and commit what the user has in the index and working tree.
1871 */
1872static void am_resolve(struct am_state *state)
1873{
1874 validate_resume_state(state);
1875
5d28cf78 1876 say(state, stdout, _("Applying: %.*s"), linelen(state->msg), state->msg);
240bfd2d
PT
1877
1878 if (!index_has_changes(NULL)) {
1879 printf_ln(_("No changes - did you forget to use 'git add'?\n"
1880 "If there is nothing left to stage, chances are that something else\n"
1881 "already introduced the same changes; you might want to skip this patch."));
2d83109a 1882 die_user_resolve(state);
240bfd2d
PT
1883 }
1884
1885 if (unmerged_cache()) {
1886 printf_ln(_("You still have unmerged paths in your index.\n"
6c486862
JNA
1887 "You should 'git add' each file with resolved conflicts to mark them as such.\n"
1888 "You might run `git rm` on a file to accept \"deleted by them\" for it."));
2d83109a 1889 die_user_resolve(state);
240bfd2d
PT
1890 }
1891
7ff26832
PT
1892 if (state->interactive) {
1893 write_index_patch(state);
1894 if (do_interactive(state))
1895 goto next;
1896 }
1897
f1cb96d6
PT
1898 rerere(0);
1899
240bfd2d
PT
1900 do_commit(state);
1901
7ff26832 1902next:
240bfd2d 1903 am_next(state);
852a1710 1904 am_load(state);
8c7b1563 1905 am_run(state, 0);
240bfd2d
PT
1906}
1907
9990080c
PT
1908/**
1909 * Performs a checkout fast-forward from `head` to `remote`. If `reset` is
1910 * true, any unmerged entries will be discarded. Returns 0 on success, -1 on
1911 * failure.
1912 */
1913static int fast_forward_to(struct tree *head, struct tree *remote, int reset)
1914{
837e34eb 1915 struct lock_file lock_file = LOCK_INIT;
9990080c
PT
1916 struct unpack_trees_options opts;
1917 struct tree_desc t[2];
1918
1919 if (parse_tree(head) || parse_tree(remote))
1920 return -1;
1921
837e34eb 1922 hold_locked_index(&lock_file, LOCK_DIE_ON_ERROR);
9990080c
PT
1923
1924 refresh_cache(REFRESH_QUIET);
1925
1926 memset(&opts, 0, sizeof(opts));
1927 opts.head_idx = 1;
1928 opts.src_index = &the_index;
1929 opts.dst_index = &the_index;
1930 opts.update = 1;
1931 opts.merge = 1;
1932 opts.reset = reset;
1933 opts.fn = twoway_merge;
1934 init_tree_desc(&t[0], head->buffer, head->size);
1935 init_tree_desc(&t[1], remote->buffer, remote->size);
1936
1937 if (unpack_trees(2, t, &opts)) {
837e34eb 1938 rollback_lock_file(&lock_file);
9990080c
PT
1939 return -1;
1940 }
1941
837e34eb 1942 if (write_locked_index(&the_index, &lock_file, COMMIT_LOCK))
9990080c
PT
1943 die(_("unable to write new index file"));
1944
1945 return 0;
1946}
1947
3ecc7040
PT
1948/**
1949 * Merges a tree into the index. The index's stat info will take precedence
1950 * over the merged tree's. Returns 0 on success, -1 on failure.
1951 */
1952static int merge_tree(struct tree *tree)
1953{
837e34eb 1954 struct lock_file lock_file = LOCK_INIT;
3ecc7040
PT
1955 struct unpack_trees_options opts;
1956 struct tree_desc t[1];
1957
1958 if (parse_tree(tree))
1959 return -1;
1960
837e34eb 1961 hold_locked_index(&lock_file, LOCK_DIE_ON_ERROR);
3ecc7040
PT
1962
1963 memset(&opts, 0, sizeof(opts));
1964 opts.head_idx = 1;
1965 opts.src_index = &the_index;
1966 opts.dst_index = &the_index;
1967 opts.merge = 1;
1968 opts.fn = oneway_merge;
1969 init_tree_desc(&t[0], tree->buffer, tree->size);
1970
1971 if (unpack_trees(1, t, &opts)) {
837e34eb 1972 rollback_lock_file(&lock_file);
3ecc7040
PT
1973 return -1;
1974 }
1975
837e34eb 1976 if (write_locked_index(&the_index, &lock_file, COMMIT_LOCK))
3ecc7040
PT
1977 die(_("unable to write new index file"));
1978
1979 return 0;
1980}
1981
9990080c
PT
1982/**
1983 * Clean the index without touching entries that are not modified between
1984 * `head` and `remote`.
1985 */
8c88769b 1986static int clean_index(const struct object_id *head, const struct object_id *remote)
9990080c 1987{
9990080c 1988 struct tree *head_tree, *remote_tree, *index_tree;
8c88769b 1989 struct object_id index;
9990080c 1990
a9dbc179 1991 head_tree = parse_tree_indirect(head);
9990080c 1992 if (!head_tree)
8c88769b 1993 return error(_("Could not parse object '%s'."), oid_to_hex(head));
9990080c 1994
a9dbc179 1995 remote_tree = parse_tree_indirect(remote);
9990080c 1996 if (!remote_tree)
8c88769b 1997 return error(_("Could not parse object '%s'."), oid_to_hex(remote));
9990080c
PT
1998
1999 read_cache_unmerged();
2000
2001 if (fast_forward_to(head_tree, head_tree, 1))
2002 return -1;
2003
8c88769b 2004 if (write_cache_as_tree(index.hash, 0, NULL))
9990080c
PT
2005 return -1;
2006
a9dbc179 2007 index_tree = parse_tree_indirect(&index);
9990080c 2008 if (!index_tree)
8c88769b 2009 return error(_("Could not parse object '%s'."), oid_to_hex(&index));
9990080c
PT
2010
2011 if (fast_forward_to(index_tree, remote_tree, 0))
2012 return -1;
2013
3ecc7040 2014 if (merge_tree(remote_tree))
9990080c 2015 return -1;
9990080c
PT
2016
2017 remove_branch_state();
2018
2019 return 0;
2020}
2021
f1cb96d6
PT
2022/**
2023 * Resets rerere's merge resolution metadata.
2024 */
2025static void am_rerere_clear(void)
2026{
2027 struct string_list merge_rr = STRING_LIST_INIT_DUP;
f1cb96d6
PT
2028 rerere_clear(&merge_rr);
2029 string_list_clear(&merge_rr, 1);
2030}
2031
9990080c
PT
2032/**
2033 * Resume the current am session by skipping the current patch.
2034 */
2035static void am_skip(struct am_state *state)
2036{
8c88769b 2037 struct object_id head;
9990080c 2038
f1cb96d6
PT
2039 am_rerere_clear();
2040
8c88769b 2041 if (get_oid("HEAD", &head))
2042 hashcpy(head.hash, EMPTY_TREE_SHA1_BIN);
9990080c 2043
8c88769b 2044 if (clean_index(&head, &head))
9990080c
PT
2045 die(_("failed to clean index"));
2046
2047 am_next(state);
852a1710 2048 am_load(state);
9990080c
PT
2049 am_run(state, 0);
2050}
2051
33388a71
PT
2052/**
2053 * Returns true if it is safe to reset HEAD to the ORIG_HEAD, false otherwise.
2054 *
2055 * It is not safe to reset HEAD when:
2056 * 1. git-am previously failed because the index was dirty.
2057 * 2. HEAD has moved since git-am previously failed.
2058 */
2059static int safe_to_abort(const struct am_state *state)
2060{
2061 struct strbuf sb = STRBUF_INIT;
8c88769b 2062 struct object_id abort_safety, head;
33388a71
PT
2063
2064 if (file_exists(am_path(state, "dirtyindex")))
2065 return 0;
2066
2067 if (read_state_file(&sb, state, "abort-safety", 1) > 0) {
8c88769b 2068 if (get_oid_hex(sb.buf, &abort_safety))
ccd71b2f 2069 die(_("could not parse %s"), am_path(state, "abort-safety"));
33388a71 2070 } else
8c88769b 2071 oidclr(&abort_safety);
28ac7aa7 2072 strbuf_release(&sb);
33388a71 2073
8c88769b 2074 if (get_oid("HEAD", &head))
2075 oidclr(&head);
33388a71 2076
8c88769b 2077 if (!oidcmp(&head, &abort_safety))
33388a71
PT
2078 return 1;
2079
1868331f 2080 warning(_("You seem to have moved HEAD since the last 'am' failure.\n"
33388a71
PT
2081 "Not rewinding to ORIG_HEAD"));
2082
2083 return 0;
2084}
2085
2086/**
2087 * Aborts the current am session if it is safe to do so.
2088 */
2089static void am_abort(struct am_state *state)
2090{
8c88769b 2091 struct object_id curr_head, orig_head;
33388a71
PT
2092 int has_curr_head, has_orig_head;
2093 char *curr_branch;
2094
2095 if (!safe_to_abort(state)) {
2096 am_destroy(state);
2097 return;
2098 }
2099
f1cb96d6
PT
2100 am_rerere_clear();
2101
0f2dc722 2102 curr_branch = resolve_refdup("HEAD", 0, &curr_head, NULL);
57e0ef0e 2103 has_curr_head = curr_branch && !is_null_oid(&curr_head);
33388a71 2104 if (!has_curr_head)
8c88769b 2105 hashcpy(curr_head.hash, EMPTY_TREE_SHA1_BIN);
33388a71 2106
8c88769b 2107 has_orig_head = !get_oid("ORIG_HEAD", &orig_head);
33388a71 2108 if (!has_orig_head)
8c88769b 2109 hashcpy(orig_head.hash, EMPTY_TREE_SHA1_BIN);
33388a71 2110
8c88769b 2111 clean_index(&curr_head, &orig_head);
33388a71
PT
2112
2113 if (has_orig_head)
ae077771 2114 update_ref("am --abort", "HEAD", &orig_head,
2115 has_curr_head ? &curr_head : NULL, 0,
2116 UPDATE_REFS_DIE_ON_ERR);
33388a71 2117 else if (curr_branch)
91774afc 2118 delete_ref(NULL, curr_branch, NULL, REF_NO_DEREF);
33388a71
PT
2119
2120 free(curr_branch);
2121 am_destroy(state);
2122}
2123
11c2177f
PT
2124/**
2125 * parse_options() callback that validates and sets opt->value to the
2126 * PATCH_FORMAT_* enum value corresponding to `arg`.
2127 */
2128static int parse_opt_patchformat(const struct option *opt, const char *arg, int unset)
2129{
2130 int *opt_value = opt->value;
2131
2132 if (!strcmp(arg, "mbox"))
2133 *opt_value = PATCH_FORMAT_MBOX;
5ae41c79
PT
2134 else if (!strcmp(arg, "stgit"))
2135 *opt_value = PATCH_FORMAT_STGIT;
336108c1
PT
2136 else if (!strcmp(arg, "stgit-series"))
2137 *opt_value = PATCH_FORMAT_STGIT_SERIES;
94cd175c
PT
2138 else if (!strcmp(arg, "hg"))
2139 *opt_value = PATCH_FORMAT_HG;
d9925d1a
EW
2140 else if (!strcmp(arg, "mboxrd"))
2141 *opt_value = PATCH_FORMAT_MBOXRD;
11c2177f
PT
2142 else
2143 return error(_("Invalid value for --patch-format: %s"), arg);
2144 return 0;
2145}
2146
240bfd2d
PT
2147enum resume_mode {
2148 RESUME_FALSE = 0,
8c7b1563 2149 RESUME_APPLY,
9990080c 2150 RESUME_RESOLVED,
33388a71
PT
2151 RESUME_SKIP,
2152 RESUME_ABORT
240bfd2d
PT
2153};
2154
434c64df
RMM
2155static int git_am_config(const char *k, const char *v, void *cb)
2156{
2157 int status;
2158
2159 status = git_gpg_config(k, v, NULL);
2160 if (status)
2161 return status;
2162
2163 return git_default_config(k, v, NULL);
2164}
2165
73c2779f
PT
2166int cmd_am(int argc, const char **argv, const char *prefix)
2167{
8c3bd9e2 2168 struct am_state state;
c2676cde 2169 int binary = -1;
5d123a40 2170 int keep_cr = -1;
11c2177f 2171 int patch_format = PATCH_FORMAT_UNKNOWN;
240bfd2d 2172 enum resume_mode resume = RESUME_FALSE;
852a1710 2173 int in_progress;
8c3bd9e2
PT
2174
2175 const char * const usage[] = {
d65fdc9c 2176 N_("git am [<options>] [(<mbox> | <Maildir>)...]"),
d96a0313 2177 N_("git am [<options>] (--continue | --skip | --abort)"),
8c3bd9e2
PT
2178 NULL
2179 };
2180
2181 struct option options[] = {
7ff26832
PT
2182 OPT_BOOL('i', "interactive", &state.interactive,
2183 N_("run interactively")),
c2676cde 2184 OPT_HIDDEN_BOOL('b', "binary", &binary,
1fb5a0ea 2185 N_("historical option -- no-op")),
84f3de28
PT
2186 OPT_BOOL('3', "3way", &state.threeway,
2187 N_("allow fall back on 3way merging if needed")),
5d28cf78 2188 OPT__QUIET(&state.quiet, N_("be quiet")),
b5e82359
PT
2189 OPT_SET_INT('s', "signoff", &state.signoff,
2190 N_("add a Signed-off-by line to the commit message"),
2191 SIGNOFF_EXPLICIT),
ef7ee16d
PT
2192 OPT_BOOL('u', "utf8", &state.utf8,
2193 N_("recode into utf8 (default)")),
4f1b6961
PT
2194 OPT_SET_INT('k', "keep", &state.keep,
2195 N_("pass -k flag to git-mailinfo"), KEEP_TRUE),
2196 OPT_SET_INT(0, "keep-non-patch", &state.keep,
2197 N_("pass -b flag to git-mailinfo"), KEEP_NON_PATCH),
702cbaad
PT
2198 OPT_BOOL('m', "message-id", &state.message_id,
2199 N_("pass -m flag to git-mailinfo")),
5d123a40
PT
2200 { OPTION_SET_INT, 0, "keep-cr", &keep_cr, NULL,
2201 N_("pass --keep-cr flag to git-mailsplit for mbox format"),
2202 PARSE_OPT_NOARG | PARSE_OPT_NONEG, NULL, 1},
2203 { OPTION_SET_INT, 0, "no-keep-cr", &keep_cr, NULL,
2204 N_("do not pass --keep-cr flag to git-mailsplit independent of am.keepcr"),
2205 PARSE_OPT_NOARG | PARSE_OPT_NONEG, NULL, 0},
9b646617
PT
2206 OPT_BOOL('c', "scissors", &state.scissors,
2207 N_("strip everything before a scissors line")),
257e8cec
PT
2208 OPT_PASSTHRU_ARGV(0, "whitespace", &state.git_apply_opts, N_("action"),
2209 N_("pass it through git-apply"),
2210 0),
2211 OPT_PASSTHRU_ARGV(0, "ignore-space-change", &state.git_apply_opts, NULL,
2212 N_("pass it through git-apply"),
2213 PARSE_OPT_NOARG),
2214 OPT_PASSTHRU_ARGV(0, "ignore-whitespace", &state.git_apply_opts, NULL,
2215 N_("pass it through git-apply"),
2216 PARSE_OPT_NOARG),
2217 OPT_PASSTHRU_ARGV(0, "directory", &state.git_apply_opts, N_("root"),
2218 N_("pass it through git-apply"),
2219 0),
2220 OPT_PASSTHRU_ARGV(0, "exclude", &state.git_apply_opts, N_("path"),
2221 N_("pass it through git-apply"),
2222 0),
2223 OPT_PASSTHRU_ARGV(0, "include", &state.git_apply_opts, N_("path"),
2224 N_("pass it through git-apply"),
2225 0),
2226 OPT_PASSTHRU_ARGV('C', NULL, &state.git_apply_opts, N_("n"),
2227 N_("pass it through git-apply"),
2228 0),
2229 OPT_PASSTHRU_ARGV('p', NULL, &state.git_apply_opts, N_("num"),
2230 N_("pass it through git-apply"),
2231 0),
11c2177f
PT
2232 OPT_CALLBACK(0, "patch-format", &patch_format, N_("format"),
2233 N_("format the patch(es) are in"),
2234 parse_opt_patchformat),
257e8cec
PT
2235 OPT_PASSTHRU_ARGV(0, "reject", &state.git_apply_opts, NULL,
2236 N_("pass it through git-apply"),
2237 PARSE_OPT_NOARG),
2d83109a
PT
2238 OPT_STRING(0, "resolvemsg", &state.resolvemsg, NULL,
2239 N_("override error message when patch failure occurs")),
240bfd2d
PT
2240 OPT_CMDMODE(0, "continue", &resume,
2241 N_("continue applying patches after resolving a conflict"),
2242 RESUME_RESOLVED),
2243 OPT_CMDMODE('r', "resolved", &resume,
2244 N_("synonyms for --continue"),
2245 RESUME_RESOLVED),
9990080c
PT
2246 OPT_CMDMODE(0, "skip", &resume,
2247 N_("skip the current patch"),
2248 RESUME_SKIP),
33388a71
PT
2249 OPT_CMDMODE(0, "abort", &resume,
2250 N_("restore the original branch and abort the patching operation."),
2251 RESUME_ABORT),
0cd4bcba
PT
2252 OPT_BOOL(0, "committer-date-is-author-date",
2253 &state.committer_date_is_author_date,
2254 N_("lie about committer date")),
f07adb62
PT
2255 OPT_BOOL(0, "ignore-date", &state.ignore_date,
2256 N_("use current timestamp for author date")),
f1cb96d6 2257 OPT_RERERE_AUTOUPDATE(&state.allow_rerere_autoupdate),
7e35dacb
PT
2258 { OPTION_STRING, 'S', "gpg-sign", &state.sign_commit, N_("key-id"),
2259 N_("GPG-sign commits"),
2260 PARSE_OPT_OPTARG, NULL, (intptr_t) "" },
35bdcc59
PT
2261 OPT_HIDDEN_BOOL(0, "rebasing", &state.rebasing,
2262 N_("(internal use for git-rebase)")),
8c3bd9e2
PT
2263 OPT_END()
2264 };
73c2779f 2265
f3a2fffe
JK
2266 if (argc == 2 && !strcmp(argv[1], "-h"))
2267 usage_with_options(usage, options);
2268
434c64df 2269 git_config(git_am_config, NULL);
8c3bd9e2 2270
16d2676c 2271 am_state_init(&state);
8c3bd9e2 2272
852a1710
PT
2273 in_progress = am_in_progress(&state);
2274 if (in_progress)
2275 am_load(&state);
2276
8c3bd9e2
PT
2277 argc = parse_options(argc, argv, prefix, options, usage, 0);
2278
c2676cde
PT
2279 if (binary >= 0)
2280 fprintf_ln(stderr, _("The -b/--binary option has been a no-op for long time, and\n"
2281 "it will be removed. Please do not use it anymore."));
2282
5e4f9cff
PT
2283 /* Ensure a valid committer ident can be constructed */
2284 git_committer_info(IDENT_STRICT);
2285
38a824fe
PT
2286 if (read_index_preload(&the_index, NULL) < 0)
2287 die(_("failed to read the index"));
2288
852a1710 2289 if (in_progress) {
8d185503
PT
2290 /*
2291 * Catch user error to feed us patches when there is a session
2292 * in progress:
2293 *
2294 * 1. mbox path(s) are provided on the command-line.
2295 * 2. stdin is not a tty: the user is trying to feed us a patch
2296 * from standard input. This is somewhat unreliable -- stdin
2297 * could be /dev/null for example and the caller did not
2298 * intend to feed us a patch but wanted to continue
2299 * unattended.
2300 */
2301 if (argc || (resume == RESUME_FALSE && !isatty(0)))
2302 die(_("previous rebase directory %s still exists but mbox given."),
2303 state.dir);
2304
8c7b1563
PT
2305 if (resume == RESUME_FALSE)
2306 resume = RESUME_APPLY;
b5e82359
PT
2307
2308 if (state.signoff == SIGNOFF_EXPLICIT)
2309 am_append_signoff(&state);
8c7b1563 2310 } else {
11c2177f
PT
2311 struct argv_array paths = ARGV_ARRAY_INIT;
2312 int i;
2313
6d42ac29
PT
2314 /*
2315 * Handle stray state directory in the independent-run case. In
2316 * the --rebasing case, it is up to the caller to take care of
2317 * stray directories.
2318 */
2319 if (file_exists(state.dir) && !state.rebasing) {
2320 if (resume == RESUME_ABORT) {
2321 am_destroy(&state);
2322 am_state_release(&state);
2323 return 0;
2324 }
2325
2326 die(_("Stray %s directory found.\n"
2327 "Use \"git am --abort\" to remove it."),
2328 state.dir);
2329 }
2330
240bfd2d
PT
2331 if (resume)
2332 die(_("Resolve operation not in progress, we are not resuming."));
2333
11c2177f
PT
2334 for (i = 0; i < argc; i++) {
2335 if (is_absolute_path(argv[i]) || !prefix)
2336 argv_array_push(&paths, argv[i]);
2337 else
2338 argv_array_push(&paths, mkpath("%s/%s", prefix, argv[i]));
2339 }
2340
5d123a40 2341 am_setup(&state, patch_format, paths.argv, keep_cr);
11c2177f
PT
2342
2343 argv_array_clear(&paths);
2344 }
8c3bd9e2 2345
240bfd2d
PT
2346 switch (resume) {
2347 case RESUME_FALSE:
8c7b1563
PT
2348 am_run(&state, 0);
2349 break;
2350 case RESUME_APPLY:
2351 am_run(&state, 1);
240bfd2d
PT
2352 break;
2353 case RESUME_RESOLVED:
2354 am_resolve(&state);
2355 break;
9990080c
PT
2356 case RESUME_SKIP:
2357 am_skip(&state);
2358 break;
33388a71
PT
2359 case RESUME_ABORT:
2360 am_abort(&state);
2361 break;
240bfd2d
PT
2362 default:
2363 die("BUG: invalid resume value");
2364 }
8c3bd9e2
PT
2365
2366 am_state_release(&state);
2367
73c2779f
PT
2368 return 0;
2369}