4 * Copyright (c) 2008 Miklos Vajna <vmiklos@frugalware.org>
6 * Based on git-merge.sh by Junio C Hamano.
10 #include "parse-options.h"
12 #include "run-command.h"
18 #include "unpack-trees.h"
19 #include "cache-tree.h"
26 #include "merge-recursive.h"
27 #include "resolve-undo.h"
29 #define DEFAULT_TWOHEAD (1<<0)
30 #define DEFAULT_OCTOPUS (1<<1)
31 #define NO_FAST_FORWARD (1<<2)
32 #define NO_TRIVIAL (1<<3)
39 static const char * const builtin_merge_usage
[] = {
40 "git merge [options] <remote>...",
41 "git merge [options] <msg> HEAD <remote>",
45 static int show_diffstat
= 1, shortlog_len
, squash
;
46 static int option_commit
= 1, allow_fast_forward
= 1;
47 static int fast_forward_only
;
48 static int allow_trivial
= 1, have_message
;
49 static struct strbuf merge_msg
;
50 static struct commit_list
*remoteheads
;
51 static unsigned char head
[20], stash
[20];
52 static struct strategy
**use_strategies
;
53 static size_t use_strategies_nr
, use_strategies_alloc
;
54 static const char **xopts
;
55 static size_t xopts_nr
, xopts_alloc
;
56 static const char *branch
;
58 static int allow_rerere_auto
;
60 static struct strategy all_strategy
[] = {
61 { "recursive", DEFAULT_TWOHEAD
| NO_TRIVIAL
},
62 { "octopus", DEFAULT_OCTOPUS
},
64 { "ours", NO_FAST_FORWARD
| NO_TRIVIAL
},
65 { "subtree", NO_FAST_FORWARD
| NO_TRIVIAL
},
68 static const char *pull_twohead
, *pull_octopus
;
70 static int option_parse_message(const struct option
*opt
,
71 const char *arg
, int unset
)
73 struct strbuf
*buf
= opt
->value
;
76 strbuf_setlen(buf
, 0);
78 strbuf_addf(buf
, "%s%s", buf
->len
? "\n\n" : "", arg
);
81 return error("switch `m' requires a value");
85 static struct strategy
*get_strategy(const char *name
)
89 static struct cmdnames main_cmds
, other_cmds
;
95 for (i
= 0; i
< ARRAY_SIZE(all_strategy
); i
++)
96 if (!strcmp(name
, all_strategy
[i
].name
))
97 return &all_strategy
[i
];
100 struct cmdnames not_strategies
;
103 memset(¬_strategies
, 0, sizeof(struct cmdnames
));
104 load_command_list("git-merge-", &main_cmds
, &other_cmds
);
105 for (i
= 0; i
< main_cmds
.cnt
; i
++) {
107 struct cmdname
*ent
= main_cmds
.names
[i
];
108 for (j
= 0; j
< ARRAY_SIZE(all_strategy
); j
++)
109 if (!strncmp(ent
->name
, all_strategy
[j
].name
, ent
->len
)
110 && !all_strategy
[j
].name
[ent
->len
])
113 add_cmdname(¬_strategies
, ent
->name
, ent
->len
);
115 exclude_cmds(&main_cmds
, ¬_strategies
);
117 if (!is_in_cmdlist(&main_cmds
, name
) && !is_in_cmdlist(&other_cmds
, name
)) {
118 fprintf(stderr
, "Could not find merge strategy '%s'.\n", name
);
119 fprintf(stderr
, "Available strategies are:");
120 for (i
= 0; i
< main_cmds
.cnt
; i
++)
121 fprintf(stderr
, " %s", main_cmds
.names
[i
]->name
);
122 fprintf(stderr
, ".\n");
123 if (other_cmds
.cnt
) {
124 fprintf(stderr
, "Available custom strategies are:");
125 for (i
= 0; i
< other_cmds
.cnt
; i
++)
126 fprintf(stderr
, " %s", other_cmds
.names
[i
]->name
);
127 fprintf(stderr
, ".\n");
132 ret
= xcalloc(1, sizeof(struct strategy
));
133 ret
->name
= xstrdup(name
);
137 static void append_strategy(struct strategy
*s
)
139 ALLOC_GROW(use_strategies
, use_strategies_nr
+ 1, use_strategies_alloc
);
140 use_strategies
[use_strategies_nr
++] = s
;
143 static int option_parse_strategy(const struct option
*opt
,
144 const char *name
, int unset
)
149 append_strategy(get_strategy(name
));
153 static int option_parse_x(const struct option
*opt
,
154 const char *arg
, int unset
)
159 ALLOC_GROW(xopts
, xopts_nr
+ 1, xopts_alloc
);
160 xopts
[xopts_nr
++] = xstrdup(arg
);
164 static int option_parse_n(const struct option
*opt
,
165 const char *arg
, int unset
)
167 show_diffstat
= unset
;
171 static struct option builtin_merge_options
[] = {
172 { OPTION_CALLBACK
, 'n', NULL
, NULL
, NULL
,
173 "do not show a diffstat at the end of the merge",
174 PARSE_OPT_NOARG
, option_parse_n
},
175 OPT_BOOLEAN(0, "stat", &show_diffstat
,
176 "show a diffstat at the end of the merge"),
177 OPT_BOOLEAN(0, "summary", &show_diffstat
, "(synonym to --stat)"),
178 { OPTION_INTEGER
, 0, "log", &shortlog_len
, "n",
179 "add (at most <n>) entries from shortlog to merge commit message",
180 PARSE_OPT_OPTARG
, NULL
, DEFAULT_MERGE_LOG_LEN
},
181 OPT_BOOLEAN(0, "squash", &squash
,
182 "create a single commit instead of doing a merge"),
183 OPT_BOOLEAN(0, "commit", &option_commit
,
184 "perform a commit if the merge succeeds (default)"),
185 OPT_BOOLEAN(0, "ff", &allow_fast_forward
,
186 "allow fast-forward (default)"),
187 OPT_BOOLEAN(0, "ff-only", &fast_forward_only
,
188 "abort if fast-forward is not possible"),
189 OPT_RERERE_AUTOUPDATE(&allow_rerere_auto
),
190 OPT_CALLBACK('s', "strategy", &use_strategies
, "strategy",
191 "merge strategy to use", option_parse_strategy
),
192 OPT_CALLBACK('X', "strategy-option", &xopts
, "option=value",
193 "option for selected merge strategy", option_parse_x
),
194 OPT_CALLBACK('m', "message", &merge_msg
, "message",
195 "message to be used for the merge commit (if any)",
196 option_parse_message
),
197 OPT__VERBOSITY(&verbosity
),
201 /* Cleans up metadata that is uninteresting after a succeeded merge. */
202 static void drop_save(void)
204 unlink(git_path("MERGE_HEAD"));
205 unlink(git_path("MERGE_MSG"));
206 unlink(git_path("MERGE_MODE"));
209 static void save_state(void)
212 struct child_process cp
;
213 struct strbuf buffer
= STRBUF_INIT
;
214 const char *argv
[] = {"stash", "create", NULL
};
216 memset(&cp
, 0, sizeof(cp
));
221 if (start_command(&cp
))
222 die("could not run stash.");
223 len
= strbuf_read(&buffer
, cp
.out
, 1024);
226 if (finish_command(&cp
) || len
< 0)
230 strbuf_setlen(&buffer
, buffer
.len
-1);
231 if (get_sha1(buffer
.buf
, stash
))
232 die("not a valid object: %s", buffer
.buf
);
235 static void reset_hard(unsigned const char *sha1
, int verbose
)
240 args
[i
++] = "read-tree";
243 args
[i
++] = "--reset";
245 args
[i
++] = sha1_to_hex(sha1
);
248 if (run_command_v_opt(args
, RUN_GIT_CMD
))
249 die("read-tree failed");
252 static void restore_state(void)
254 struct strbuf sb
= STRBUF_INIT
;
255 const char *args
[] = { "stash", "apply", NULL
, NULL
};
257 if (is_null_sha1(stash
))
262 args
[2] = sha1_to_hex(stash
);
265 * It is OK to ignore error here, for example when there was
266 * nothing to restore.
268 run_command_v_opt(args
, RUN_GIT_CMD
);
271 refresh_cache(REFRESH_QUIET
);
274 /* This is called when no merge was necessary. */
275 static void finish_up_to_date(const char *msg
)
278 printf("%s%s\n", squash
? " (nothing to squash)" : "", msg
);
282 static void squash_message(void)
285 struct commit
*commit
;
286 struct strbuf out
= STRBUF_INIT
;
287 struct commit_list
*j
;
289 struct pretty_print_context ctx
= {0};
291 printf("Squash commit -- not updating HEAD\n");
292 fd
= open(git_path("SQUASH_MSG"), O_WRONLY
| O_CREAT
, 0666);
294 die_errno("Could not write to '%s'", git_path("SQUASH_MSG"));
296 init_revisions(&rev
, NULL
);
297 rev
.ignore_merges
= 1;
298 rev
.commit_format
= CMIT_FMT_MEDIUM
;
300 commit
= lookup_commit(head
);
301 commit
->object
.flags
|= UNINTERESTING
;
302 add_pending_object(&rev
, &commit
->object
, NULL
);
304 for (j
= remoteheads
; j
; j
= j
->next
)
305 add_pending_object(&rev
, &j
->item
->object
, NULL
);
307 setup_revisions(0, NULL
, &rev
, NULL
);
308 if (prepare_revision_walk(&rev
))
309 die("revision walk setup failed");
311 ctx
.abbrev
= rev
.abbrev
;
312 ctx
.date_mode
= rev
.date_mode
;
314 strbuf_addstr(&out
, "Squashed commit of the following:\n");
315 while ((commit
= get_revision(&rev
)) != NULL
) {
316 strbuf_addch(&out
, '\n');
317 strbuf_addf(&out
, "commit %s\n",
318 sha1_to_hex(commit
->object
.sha1
));
319 pretty_print_commit(rev
.commit_format
, commit
, &out
, &ctx
);
321 if (write(fd
, out
.buf
, out
.len
) < 0)
322 die_errno("Writing SQUASH_MSG");
324 die_errno("Finishing SQUASH_MSG");
325 strbuf_release(&out
);
328 static void finish(const unsigned char *new_head
, const char *msg
)
330 struct strbuf reflog_message
= STRBUF_INIT
;
333 strbuf_addstr(&reflog_message
, getenv("GIT_REFLOG_ACTION"));
337 strbuf_addf(&reflog_message
, "%s: %s",
338 getenv("GIT_REFLOG_ACTION"), msg
);
343 if (verbosity
>= 0 && !merge_msg
.len
)
344 printf("No merge message -- not updating HEAD\n");
346 const char *argv_gc_auto
[] = { "gc", "--auto", NULL
};
347 update_ref(reflog_message
.buf
, "HEAD",
351 * We ignore errors in 'gc --auto', since the
352 * user should see them.
354 run_command_v_opt(argv_gc_auto
, RUN_GIT_CMD
);
357 if (new_head
&& show_diffstat
) {
358 struct diff_options opts
;
360 opts
.output_format
|=
361 DIFF_FORMAT_SUMMARY
| DIFF_FORMAT_DIFFSTAT
;
362 opts
.detect_rename
= DIFF_DETECT_RENAME
;
363 if (diff_use_color_default
> 0)
364 DIFF_OPT_SET(&opts
, COLOR_DIFF
);
365 if (diff_setup_done(&opts
) < 0)
366 die("diff_setup_done failed");
367 diff_tree_sha1(head
, new_head
, "", &opts
);
372 /* Run a post-merge hook */
373 run_hook(NULL
, "post-merge", squash
? "1" : "0", NULL
);
375 strbuf_release(&reflog_message
);
378 /* Get the name for the merge commit's message. */
379 static void merge_name(const char *remote
, struct strbuf
*msg
)
381 struct object
*remote_head
;
382 unsigned char branch_head
[20], buf_sha
[20];
383 struct strbuf buf
= STRBUF_INIT
;
384 struct strbuf bname
= STRBUF_INIT
;
389 strbuf_branchname(&bname
, remote
);
392 memset(branch_head
, 0, sizeof(branch_head
));
393 remote_head
= peel_to_type(remote
, 0, NULL
, OBJ_COMMIT
);
395 die("'%s' does not point to a commit", remote
);
397 if (dwim_ref(remote
, strlen(remote
), branch_head
, &found_ref
) > 0) {
398 if (!prefixcmp(found_ref
, "refs/heads/")) {
399 strbuf_addf(msg
, "%s\t\tbranch '%s' of .\n",
400 sha1_to_hex(branch_head
), remote
);
403 if (!prefixcmp(found_ref
, "refs/remotes/")) {
404 strbuf_addf(msg
, "%s\t\tremote branch '%s' of .\n",
405 sha1_to_hex(branch_head
), remote
);
410 /* See if remote matches <name>^^^.. or <name>~<number> */
411 for (len
= 0, ptr
= remote
+ strlen(remote
);
412 remote
< ptr
&& ptr
[-1] == '^';
419 ptr
= strrchr(remote
, '~');
421 int seen_nonzero
= 0;
424 while (*++ptr
&& isdigit(*ptr
)) {
425 seen_nonzero
|= (*ptr
!= '0');
429 len
= 0; /* not ...~<number> */
430 else if (seen_nonzero
)
433 early
= 1; /* "name~" is "name~1"! */
437 struct strbuf truname
= STRBUF_INIT
;
438 strbuf_addstr(&truname
, "refs/heads/");
439 strbuf_addstr(&truname
, remote
);
440 strbuf_setlen(&truname
, truname
.len
- len
);
441 if (resolve_ref(truname
.buf
, buf_sha
, 1, NULL
)) {
443 "%s\t\tbranch '%s'%s of .\n",
444 sha1_to_hex(remote_head
->sha1
),
446 (early
? " (early part)" : ""));
447 strbuf_release(&truname
);
452 if (!strcmp(remote
, "FETCH_HEAD") &&
453 !access(git_path("FETCH_HEAD"), R_OK
)) {
455 struct strbuf line
= STRBUF_INIT
;
458 fp
= fopen(git_path("FETCH_HEAD"), "r");
460 die_errno("could not open '%s' for reading",
461 git_path("FETCH_HEAD"));
462 strbuf_getline(&line
, fp
, '\n');
464 ptr
= strstr(line
.buf
, "\tnot-for-merge\t");
466 strbuf_remove(&line
, ptr
-line
.buf
+1, 13);
467 strbuf_addbuf(msg
, &line
);
468 strbuf_release(&line
);
471 strbuf_addf(msg
, "%s\t\tcommit '%s'\n",
472 sha1_to_hex(remote_head
->sha1
), remote
);
474 strbuf_release(&buf
);
475 strbuf_release(&bname
);
478 static int git_merge_config(const char *k
, const char *v
, void *cb
)
480 if (branch
&& !prefixcmp(k
, "branch.") &&
481 !prefixcmp(k
+ 7, branch
) &&
482 !strcmp(k
+ 7 + strlen(branch
), ".mergeoptions")) {
488 argc
= split_cmdline(buf
, &argv
);
490 die("Bad branch.%s.mergeoptions string", branch
);
491 argv
= xrealloc(argv
, sizeof(*argv
) * (argc
+ 2));
492 memmove(argv
+ 1, argv
, sizeof(*argv
) * (argc
+ 1));
494 parse_options(argc
, argv
, NULL
, builtin_merge_options
,
495 builtin_merge_usage
, 0);
499 if (!strcmp(k
, "merge.diffstat") || !strcmp(k
, "merge.stat"))
500 show_diffstat
= git_config_bool(k
, v
);
501 else if (!strcmp(k
, "pull.twohead"))
502 return git_config_string(&pull_twohead
, k
, v
);
503 else if (!strcmp(k
, "pull.octopus"))
504 return git_config_string(&pull_octopus
, k
, v
);
505 else if (!strcmp(k
, "merge.log") || !strcmp(k
, "merge.summary")) {
507 shortlog_len
= git_config_bool_or_int(k
, v
, &is_bool
);
508 if (!is_bool
&& shortlog_len
< 0)
509 return error("%s: negative length %s", k
, v
);
510 if (is_bool
&& shortlog_len
)
511 shortlog_len
= DEFAULT_MERGE_LOG_LEN
;
514 return git_diff_ui_config(k
, v
, cb
);
517 static int read_tree_trivial(unsigned char *common
, unsigned char *head
,
521 struct tree
*trees
[MAX_UNPACK_TREES
];
522 struct tree_desc t
[MAX_UNPACK_TREES
];
523 struct unpack_trees_options opts
;
525 memset(&opts
, 0, sizeof(opts
));
527 opts
.src_index
= &the_index
;
528 opts
.dst_index
= &the_index
;
530 opts
.verbose_update
= 1;
531 opts
.trivial_merges_only
= 1;
533 trees
[nr_trees
] = parse_tree_indirect(common
);
534 if (!trees
[nr_trees
++])
536 trees
[nr_trees
] = parse_tree_indirect(head
);
537 if (!trees
[nr_trees
++])
539 trees
[nr_trees
] = parse_tree_indirect(one
);
540 if (!trees
[nr_trees
++])
542 opts
.fn
= threeway_merge
;
543 cache_tree_free(&active_cache_tree
);
544 for (i
= 0; i
< nr_trees
; i
++) {
545 parse_tree(trees
[i
]);
546 init_tree_desc(t
+i
, trees
[i
]->buffer
, trees
[i
]->size
);
548 if (unpack_trees(nr_trees
, t
, &opts
))
553 static void write_tree_trivial(unsigned char *sha1
)
555 if (write_cache_as_tree(sha1
, 0, NULL
))
556 die("git write-tree failed to write a tree");
559 int try_merge_command(const char *strategy
, struct commit_list
*common
,
560 const char *head_arg
, struct commit_list
*remotes
)
563 int i
= 0, x
= 0, ret
;
564 struct commit_list
*j
;
565 struct strbuf buf
= STRBUF_INIT
;
567 args
= xmalloc((4 + xopts_nr
+ commit_list_count(common
) +
568 commit_list_count(remotes
)) * sizeof(char *));
569 strbuf_addf(&buf
, "merge-%s", strategy
);
571 for (x
= 0; x
< xopts_nr
; x
++) {
572 char *s
= xmalloc(strlen(xopts
[x
])+2+1);
574 strcpy(s
+2, xopts
[x
]);
577 for (j
= common
; j
; j
= j
->next
)
578 args
[i
++] = xstrdup(sha1_to_hex(j
->item
->object
.sha1
));
580 args
[i
++] = head_arg
;
581 for (j
= remotes
; j
; j
= j
->next
)
582 args
[i
++] = xstrdup(sha1_to_hex(j
->item
->object
.sha1
));
584 ret
= run_command_v_opt(args
, RUN_GIT_CMD
);
585 strbuf_release(&buf
);
587 for (x
= 0; x
< xopts_nr
; x
++)
588 free((void *)args
[i
++]);
589 for (j
= common
; j
; j
= j
->next
)
590 free((void *)args
[i
++]);
592 for (j
= remotes
; j
; j
= j
->next
)
593 free((void *)args
[i
++]);
596 if (read_cache() < 0)
597 die("failed to read the cache");
598 resolve_undo_clear();
603 static int try_merge_strategy(const char *strategy
, struct commit_list
*common
,
604 const char *head_arg
)
607 struct lock_file
*lock
= xcalloc(1, sizeof(struct lock_file
));
609 index_fd
= hold_locked_index(lock
, 1);
610 refresh_cache(REFRESH_QUIET
);
611 if (active_cache_changed
&&
612 (write_cache(index_fd
, active_cache
, active_nr
) ||
613 commit_locked_index(lock
)))
614 return error("Unable to write index.");
615 rollback_lock_file(lock
);
617 if (!strcmp(strategy
, "recursive") || !strcmp(strategy
, "subtree")) {
619 struct commit
*result
;
620 struct lock_file
*lock
= xcalloc(1, sizeof(struct lock_file
));
622 struct commit_list
*reversed
= NULL
;
623 struct merge_options o
;
624 struct commit_list
*j
;
626 if (remoteheads
->next
) {
627 error("Not handling anything other than two heads merge.");
631 init_merge_options(&o
);
632 if (!strcmp(strategy
, "subtree"))
633 o
.subtree_shift
= "";
635 for (x
= 0; x
< xopts_nr
; x
++) {
636 if (!strcmp(xopts
[x
], "ours"))
637 o
.recursive_variant
= MERGE_RECURSIVE_OURS
;
638 else if (!strcmp(xopts
[x
], "theirs"))
639 o
.recursive_variant
= MERGE_RECURSIVE_THEIRS
;
640 else if (!strcmp(xopts
[x
], "subtree"))
641 o
.subtree_shift
= "";
642 else if (!prefixcmp(xopts
[x
], "subtree="))
643 o
.subtree_shift
= xopts
[x
]+8;
645 die("Unknown option for merge-recursive: -X%s", xopts
[x
]);
648 o
.branch1
= head_arg
;
649 o
.branch2
= remoteheads
->item
->util
;
651 for (j
= common
; j
; j
= j
->next
)
652 commit_list_insert(j
->item
, &reversed
);
654 index_fd
= hold_locked_index(lock
, 1);
655 clean
= merge_recursive(&o
, lookup_commit(head
),
656 remoteheads
->item
, reversed
, &result
);
657 if (active_cache_changed
&&
658 (write_cache(index_fd
, active_cache
, active_nr
) ||
659 commit_locked_index(lock
)))
660 die ("unable to write %s", get_index_file());
661 rollback_lock_file(lock
);
662 return clean
? 0 : 1;
664 return try_merge_command(strategy
, common
, head_arg
, remoteheads
);
668 static void count_diff_files(struct diff_queue_struct
*q
,
669 struct diff_options
*opt
, void *data
)
676 static int count_unmerged_entries(void)
680 for (i
= 0; i
< active_nr
; i
++)
681 if (ce_stage(active_cache
[i
]))
687 int checkout_fast_forward(const unsigned char *head
, const unsigned char *remote
)
689 struct tree
*trees
[MAX_UNPACK_TREES
];
690 struct unpack_trees_options opts
;
691 struct tree_desc t
[MAX_UNPACK_TREES
];
692 int i
, fd
, nr_trees
= 0;
693 struct dir_struct dir
;
694 struct lock_file
*lock_file
= xcalloc(1, sizeof(struct lock_file
));
696 refresh_cache(REFRESH_QUIET
);
698 fd
= hold_locked_index(lock_file
, 1);
700 memset(&trees
, 0, sizeof(trees
));
701 memset(&opts
, 0, sizeof(opts
));
702 memset(&t
, 0, sizeof(t
));
703 memset(&dir
, 0, sizeof(dir
));
704 dir
.flags
|= DIR_SHOW_IGNORED
;
705 dir
.exclude_per_dir
= ".gitignore";
709 opts
.src_index
= &the_index
;
710 opts
.dst_index
= &the_index
;
712 opts
.verbose_update
= 1;
714 opts
.fn
= twoway_merge
;
715 opts
.msgs
= get_porcelain_error_msgs();
717 trees
[nr_trees
] = parse_tree_indirect(head
);
718 if (!trees
[nr_trees
++])
720 trees
[nr_trees
] = parse_tree_indirect(remote
);
721 if (!trees
[nr_trees
++])
723 for (i
= 0; i
< nr_trees
; i
++) {
724 parse_tree(trees
[i
]);
725 init_tree_desc(t
+i
, trees
[i
]->buffer
, trees
[i
]->size
);
727 if (unpack_trees(nr_trees
, t
, &opts
))
729 if (write_cache(fd
, active_cache
, active_nr
) ||
730 commit_locked_index(lock_file
))
731 die("unable to write new index file");
735 static void split_merge_strategies(const char *string
, struct strategy
**list
,
743 buf
= xstrdup(string
);
748 ALLOC_GROW(*list
, *nr
+ 1, *alloc
);
749 (*list
)[(*nr
)++].name
= xstrdup(q
);
754 ALLOC_GROW(*list
, *nr
+ 1, *alloc
);
755 (*list
)[(*nr
)++].name
= xstrdup(q
);
761 static void add_strategies(const char *string
, unsigned attr
)
763 struct strategy
*list
= NULL
;
764 int list_alloc
= 0, list_nr
= 0, i
;
766 memset(&list
, 0, sizeof(list
));
767 split_merge_strategies(string
, &list
, &list_nr
, &list_alloc
);
769 for (i
= 0; i
< list_nr
; i
++)
770 append_strategy(get_strategy(list
[i
].name
));
773 for (i
= 0; i
< ARRAY_SIZE(all_strategy
); i
++)
774 if (all_strategy
[i
].attr
& attr
)
775 append_strategy(&all_strategy
[i
]);
779 static int merge_trivial(void)
781 unsigned char result_tree
[20], result_commit
[20];
782 struct commit_list
*parent
= xmalloc(sizeof(*parent
));
784 write_tree_trivial(result_tree
);
785 printf("Wonderful.\n");
786 parent
->item
= lookup_commit(head
);
787 parent
->next
= xmalloc(sizeof(*parent
->next
));
788 parent
->next
->item
= remoteheads
->item
;
789 parent
->next
->next
= NULL
;
790 commit_tree(merge_msg
.buf
, result_tree
, parent
, result_commit
, NULL
);
791 finish(result_commit
, "In-index merge");
796 static int finish_automerge(struct commit_list
*common
,
797 unsigned char *result_tree
,
798 const char *wt_strategy
)
800 struct commit_list
*parents
= NULL
, *j
;
801 struct strbuf buf
= STRBUF_INIT
;
802 unsigned char result_commit
[20];
804 free_commit_list(common
);
805 if (allow_fast_forward
) {
806 parents
= remoteheads
;
807 commit_list_insert(lookup_commit(head
), &parents
);
808 parents
= reduce_heads(parents
);
810 struct commit_list
**pptr
= &parents
;
812 pptr
= &commit_list_insert(lookup_commit(head
),
814 for (j
= remoteheads
; j
; j
= j
->next
)
815 pptr
= &commit_list_insert(j
->item
, pptr
)->next
;
817 free_commit_list(remoteheads
);
818 strbuf_addch(&merge_msg
, '\n');
819 commit_tree(merge_msg
.buf
, result_tree
, parents
, result_commit
, NULL
);
820 strbuf_addf(&buf
, "Merge made by %s.", wt_strategy
);
821 finish(result_commit
, buf
.buf
);
822 strbuf_release(&buf
);
827 static int suggest_conflicts(void)
832 fp
= fopen(git_path("MERGE_MSG"), "a");
834 die_errno("Could not open '%s' for writing",
835 git_path("MERGE_MSG"));
836 fprintf(fp
, "\nConflicts:\n");
837 for (pos
= 0; pos
< active_nr
; pos
++) {
838 struct cache_entry
*ce
= active_cache
[pos
];
841 fprintf(fp
, "\t%s\n", ce
->name
);
842 while (pos
+ 1 < active_nr
&&
844 active_cache
[pos
+ 1]->name
))
849 rerere(allow_rerere_auto
);
850 printf("Automatic merge failed; "
851 "fix conflicts and then commit the result.\n");
855 static struct commit
*is_old_style_invocation(int argc
, const char **argv
)
857 struct commit
*second_token
= NULL
;
859 unsigned char second_sha1
[20];
861 if (get_sha1(argv
[1], second_sha1
))
863 second_token
= lookup_commit_reference_gently(second_sha1
, 0);
865 die("'%s' is not a commit", argv
[1]);
866 if (hashcmp(second_token
->object
.sha1
, head
))
872 static int evaluate_result(void)
877 /* Check how many files differ. */
878 init_revisions(&rev
, "");
879 setup_revisions(0, NULL
, &rev
, NULL
);
880 rev
.diffopt
.output_format
|=
881 DIFF_FORMAT_CALLBACK
;
882 rev
.diffopt
.format_callback
= count_diff_files
;
883 rev
.diffopt
.format_callback_data
= &cnt
;
884 run_diff_files(&rev
, 0);
887 * Check how many unmerged entries are
890 cnt
+= count_unmerged_entries();
895 int cmd_merge(int argc
, const char **argv
, const char *prefix
)
897 unsigned char result_tree
[20];
898 struct strbuf buf
= STRBUF_INIT
;
899 const char *head_arg
;
900 int flag
, head_invalid
= 0, i
;
901 int best_cnt
= -1, merge_was_ok
= 0, automerge_was_ok
= 0;
902 struct commit_list
*common
= NULL
;
903 const char *best_strategy
= NULL
, *wt_strategy
= NULL
;
904 struct commit_list
**remotes
= &remoteheads
;
906 if (read_cache_unmerged()) {
907 die_resolve_conflict("merge");
909 if (file_exists(git_path("MERGE_HEAD"))) {
911 * There is no unmerged entry, don't advise 'git
912 * add/rm <file>', just 'git commit'.
914 if (advice_resolve_conflict
)
915 die("You have not concluded your merge (MERGE_HEAD exists).\n"
916 "Please, commit your changes before you can merge.");
918 die("You have not concluded your merge (MERGE_HEAD exists).");
921 resolve_undo_clear();
923 * Check if we are _not_ on a detached HEAD, i.e. if there is a
926 branch
= resolve_ref("HEAD", head
, 0, &flag
);
927 if (branch
&& !prefixcmp(branch
, "refs/heads/"))
929 if (is_null_sha1(head
))
932 git_config(git_merge_config
, NULL
);
935 if (diff_use_color_default
== -1)
936 diff_use_color_default
= git_use_color_default
;
938 argc
= parse_options(argc
, argv
, prefix
, builtin_merge_options
,
939 builtin_merge_usage
, 0);
944 if (!allow_fast_forward
)
945 die("You cannot combine --squash with --no-ff.");
949 if (!allow_fast_forward
&& fast_forward_only
)
950 die("You cannot combine --no-ff with --ff-only.");
953 usage_with_options(builtin_merge_usage
,
954 builtin_merge_options
);
957 * This could be traditional "merge <msg> HEAD <commit>..." and
958 * the way we can tell it is to see if the second token is HEAD,
959 * but some people might have misused the interface and used a
960 * committish that is the same as HEAD there instead.
961 * Traditional format never would have "-m" so it is an
962 * additional safety measure to check for it.
965 if (!have_message
&& is_old_style_invocation(argc
, argv
)) {
966 strbuf_addstr(&merge_msg
, argv
[0]);
970 } else if (head_invalid
) {
971 struct object
*remote_head
;
973 * If the merged head is a valid one there is no reason
974 * to forbid "git merge" into a branch yet to be born.
975 * We do the same for "git pull".
978 die("Can merge only exactly one commit into "
981 die("Squash commit into empty head not supported yet");
982 if (!allow_fast_forward
)
983 die("Non-fast-forward commit does not make sense into "
985 remote_head
= peel_to_type(argv
[0], 0, NULL
, OBJ_COMMIT
);
987 die("%s - not something we can merge", argv
[0]);
988 update_ref("initial pull", "HEAD", remote_head
->sha1
, NULL
, 0,
990 reset_hard(remote_head
->sha1
, 0);
993 struct strbuf merge_names
= STRBUF_INIT
;
995 /* We are invoked directly as the first-class UI. */
999 * All the rest are the commits being merged;
1000 * prepare the standard merge summary message to
1001 * be appended to the given message. If remote
1002 * is invalid we will die later in the common
1003 * codepath so we discard the error in this
1006 for (i
= 0; i
< argc
; i
++)
1007 merge_name(argv
[i
], &merge_names
);
1009 if (!have_message
|| shortlog_len
) {
1010 fmt_merge_msg(&merge_names
, &merge_msg
, !have_message
,
1013 strbuf_setlen(&merge_msg
, merge_msg
.len
- 1);
1017 if (head_invalid
|| !argc
)
1018 usage_with_options(builtin_merge_usage
,
1019 builtin_merge_options
);
1021 strbuf_addstr(&buf
, "merge");
1022 for (i
= 0; i
< argc
; i
++)
1023 strbuf_addf(&buf
, " %s", argv
[i
]);
1024 setenv("GIT_REFLOG_ACTION", buf
.buf
, 0);
1027 for (i
= 0; i
< argc
; i
++) {
1029 struct commit
*commit
;
1031 o
= peel_to_type(argv
[i
], 0, NULL
, OBJ_COMMIT
);
1033 die("%s - not something we can merge", argv
[i
]);
1034 commit
= lookup_commit(o
->sha1
);
1035 commit
->util
= (void *)argv
[i
];
1036 remotes
= &commit_list_insert(commit
, remotes
)->next
;
1038 strbuf_addf(&buf
, "GITHEAD_%s", sha1_to_hex(o
->sha1
));
1039 setenv(buf
.buf
, argv
[i
], 1);
1043 if (!use_strategies
) {
1044 if (!remoteheads
->next
)
1045 add_strategies(pull_twohead
, DEFAULT_TWOHEAD
);
1047 add_strategies(pull_octopus
, DEFAULT_OCTOPUS
);
1050 for (i
= 0; i
< use_strategies_nr
; i
++) {
1051 if (use_strategies
[i
]->attr
& NO_FAST_FORWARD
)
1052 allow_fast_forward
= 0;
1053 if (use_strategies
[i
]->attr
& NO_TRIVIAL
)
1057 if (!remoteheads
->next
)
1058 common
= get_merge_bases(lookup_commit(head
),
1059 remoteheads
->item
, 1);
1061 struct commit_list
*list
= remoteheads
;
1062 commit_list_insert(lookup_commit(head
), &list
);
1063 common
= get_octopus_merge_bases(list
);
1067 update_ref("updating ORIG_HEAD", "ORIG_HEAD", head
, NULL
, 0,
1071 ; /* No common ancestors found. We need a real merge. */
1072 else if (!remoteheads
->next
&& !common
->next
&&
1073 common
->item
== remoteheads
->item
) {
1075 * If head can reach all the merge then we are up to date.
1076 * but first the most common case of merging one remote.
1078 finish_up_to_date("Already up-to-date.");
1080 } else if (allow_fast_forward
&& !remoteheads
->next
&&
1082 !hashcmp(common
->item
->object
.sha1
, head
)) {
1083 /* Again the most common case of merging one remote. */
1084 struct strbuf msg
= STRBUF_INIT
;
1088 strcpy(hex
, find_unique_abbrev(head
, DEFAULT_ABBREV
));
1091 printf("Updating %s..%s\n",
1093 find_unique_abbrev(remoteheads
->item
->object
.sha1
,
1095 strbuf_addstr(&msg
, "Fast-forward");
1098 " (no commit created; -m option ignored)");
1099 o
= peel_to_type(sha1_to_hex(remoteheads
->item
->object
.sha1
),
1100 0, NULL
, OBJ_COMMIT
);
1104 if (checkout_fast_forward(head
, remoteheads
->item
->object
.sha1
))
1107 finish(o
->sha1
, msg
.buf
);
1110 } else if (!remoteheads
->next
&& common
->next
)
1113 * We are not doing octopus and not fast-forward. Need
1116 else if (!remoteheads
->next
&& !common
->next
&& option_commit
) {
1118 * We are not doing octopus, not fast-forward, and have
1121 refresh_cache(REFRESH_QUIET
);
1122 if (allow_trivial
&& !fast_forward_only
) {
1123 /* See if it is really trivial. */
1124 git_committer_info(IDENT_ERROR_ON_NO_NAME
);
1125 printf("Trying really trivial in-index merge...\n");
1126 if (!read_tree_trivial(common
->item
->object
.sha1
,
1127 head
, remoteheads
->item
->object
.sha1
))
1128 return merge_trivial();
1133 * An octopus. If we can reach all the remote we are up
1137 struct commit_list
*j
;
1139 for (j
= remoteheads
; j
; j
= j
->next
) {
1140 struct commit_list
*common_one
;
1143 * Here we *have* to calculate the individual
1144 * merge_bases again, otherwise "git merge HEAD^
1145 * HEAD^^" would be missed.
1147 common_one
= get_merge_bases(lookup_commit(head
),
1149 if (hashcmp(common_one
->item
->object
.sha1
,
1150 j
->item
->object
.sha1
)) {
1156 finish_up_to_date("Already up-to-date. Yeeah!");
1161 if (fast_forward_only
)
1162 die("Not possible to fast-forward, aborting.");
1164 /* We are going to make a new commit. */
1165 git_committer_info(IDENT_ERROR_ON_NO_NAME
);
1168 * At this point, we need a real merge. No matter what strategy
1169 * we use, it would operate on the index, possibly affecting the
1170 * working tree, and when resolved cleanly, have the desired
1171 * tree in the index -- this means that the index must be in
1172 * sync with the head commit. The strategies are responsible
1175 if (use_strategies_nr
!= 1) {
1177 * Stash away the local changes so that we can try more
1182 memcpy(stash
, null_sha1
, 20);
1185 for (i
= 0; i
< use_strategies_nr
; i
++) {
1188 printf("Rewinding the tree to pristine...\n");
1191 if (use_strategies_nr
!= 1)
1192 printf("Trying merge strategy %s...\n",
1193 use_strategies
[i
]->name
);
1195 * Remember which strategy left the state in the working
1198 wt_strategy
= use_strategies
[i
]->name
;
1200 ret
= try_merge_strategy(use_strategies
[i
]->name
,
1202 if (!option_commit
&& !ret
) {
1205 * This is necessary here just to avoid writing
1206 * the tree, but later we will *not* exit with
1207 * status code 1 because merge_was_ok is set.
1214 * The backend exits with 1 when conflicts are
1215 * left to be resolved, with 2 when it does not
1216 * handle the given merge at all.
1219 int cnt
= evaluate_result();
1221 if (best_cnt
<= 0 || cnt
<= best_cnt
) {
1222 best_strategy
= use_strategies
[i
]->name
;
1232 /* Automerge succeeded. */
1233 write_tree_trivial(result_tree
);
1234 automerge_was_ok
= 1;
1239 * If we have a resulting tree, that means the strategy module
1240 * auto resolved the merge cleanly.
1242 if (automerge_was_ok
)
1243 return finish_automerge(common
, result_tree
, wt_strategy
);
1246 * Pick the result from the best strategy and have the user fix
1249 if (!best_strategy
) {
1251 if (use_strategies_nr
> 1)
1253 "No merge strategy handled the merge.\n");
1255 fprintf(stderr
, "Merge with strategy %s failed.\n",
1256 use_strategies
[0]->name
);
1258 } else if (best_strategy
== wt_strategy
)
1259 ; /* We already have its result in the working tree. */
1261 printf("Rewinding the tree to pristine...\n");
1263 printf("Using the %s to prepare resolving by hand.\n",
1265 try_merge_strategy(best_strategy
, common
, head_arg
);
1272 struct commit_list
*j
;
1274 for (j
= remoteheads
; j
; j
= j
->next
)
1275 strbuf_addf(&buf
, "%s\n",
1276 sha1_to_hex(j
->item
->object
.sha1
));
1277 fd
= open(git_path("MERGE_HEAD"), O_WRONLY
| O_CREAT
, 0666);
1279 die_errno("Could not open '%s' for writing",
1280 git_path("MERGE_HEAD"));
1281 if (write_in_full(fd
, buf
.buf
, buf
.len
) != buf
.len
)
1282 die_errno("Could not write to '%s'", git_path("MERGE_HEAD"));
1284 strbuf_addch(&merge_msg
, '\n');
1285 fd
= open(git_path("MERGE_MSG"), O_WRONLY
| O_CREAT
, 0666);
1287 die_errno("Could not open '%s' for writing",
1288 git_path("MERGE_MSG"));
1289 if (write_in_full(fd
, merge_msg
.buf
, merge_msg
.len
) !=
1291 die_errno("Could not write to '%s'", git_path("MERGE_MSG"));
1293 fd
= open(git_path("MERGE_MODE"), O_WRONLY
| O_CREAT
| O_TRUNC
, 0666);
1295 die_errno("Could not open '%s' for writing",
1296 git_path("MERGE_MODE"));
1298 if (!allow_fast_forward
)
1299 strbuf_addf(&buf
, "no-ff");
1300 if (write_in_full(fd
, buf
.buf
, buf
.len
) != buf
.len
)
1301 die_errno("Could not write to '%s'", git_path("MERGE_MODE"));
1306 fprintf(stderr
, "Automatic merge went well; "
1307 "stopped before committing as requested\n");
1310 return suggest_conflicts();