4 * Based on git-pull.sh by Junio C Hamano
6 * Fetch one or more remote refs and merge it/them into the current HEAD.
8 #define USE_THE_INDEX_VARIABLE
14 #include "parse-options.h"
16 #include "run-command.h"
17 #include "oid-array.h"
24 #include "submodule.h"
25 #include "submodule-config.h"
28 #include "wt-status.h"
29 #include "commit-reach.h"
30 #include "sequencer.h"
34 * Parses the value of --rebase. If value is a false value, returns
35 * REBASE_FALSE. If value is a true value, returns REBASE_TRUE. If value is
36 * "merges", returns REBASE_MERGES. If value is a invalid value, dies with
37 * a fatal error if fatal is true, otherwise returns REBASE_INVALID.
39 static enum rebase_type
parse_config_rebase(const char *key
, const char *value
,
42 enum rebase_type v
= rebase_parse_value(value
);
43 if (v
!= REBASE_INVALID
)
47 die(_("invalid value for '%s': '%s'"), key
, value
);
49 error(_("invalid value for '%s': '%s'"), key
, value
);
51 return REBASE_INVALID
;
55 * Callback for --rebase, which parses arg with parse_config_rebase().
57 static int parse_opt_rebase(const struct option
*opt
, const char *arg
, int unset
)
59 enum rebase_type
*value
= opt
->value
;
62 *value
= parse_config_rebase("--rebase", arg
, 0);
64 *value
= unset
? REBASE_FALSE
: REBASE_TRUE
;
65 return *value
== REBASE_INVALID
? -1 : 0;
68 static const char * const pull_usage
[] = {
69 N_("git pull [<options>] [<repository> [<refspec>...]]"),
74 static int opt_verbosity
;
75 static char *opt_progress
;
76 static int recurse_submodules
= RECURSE_SUBMODULES_DEFAULT
;
77 static int recurse_submodules_cli
= RECURSE_SUBMODULES_DEFAULT
;
79 /* Options passed to git-merge or git-rebase */
80 static enum rebase_type opt_rebase
= -1;
81 static char *opt_diffstat
;
83 static char *opt_signoff
;
84 static char *opt_squash
;
85 static char *opt_commit
;
86 static char *opt_edit
;
87 static char *cleanup_arg
;
89 static char *opt_verify_signatures
;
90 static char *opt_verify
;
91 static int opt_autostash
= -1;
92 static int config_autostash
;
93 static int check_trust_level
= 1;
94 static struct strvec opt_strategies
= STRVEC_INIT
;
95 static struct strvec opt_strategy_opts
= STRVEC_INIT
;
96 static char *opt_gpg_sign
;
97 static int opt_allow_unrelated_histories
;
99 /* Options passed to git-fetch */
100 static char *opt_all
;
101 static char *opt_append
;
102 static char *opt_upload_pack
;
103 static int opt_force
;
104 static char *opt_tags
;
105 static char *opt_prune
;
106 static char *max_children
;
107 static int opt_dry_run
;
108 static char *opt_keep
;
109 static char *opt_depth
;
110 static char *opt_unshallow
;
111 static char *opt_update_shallow
;
112 static char *opt_refmap
;
113 static char *opt_ipv4
;
114 static char *opt_ipv6
;
115 static int opt_show_forced_updates
= -1;
116 static char *set_upstream
;
117 static struct strvec opt_fetch
= STRVEC_INIT
;
119 static struct option pull_options
[] = {
121 OPT__VERBOSITY(&opt_verbosity
),
122 OPT_PASSTHRU(0, "progress", &opt_progress
, NULL
,
123 N_("force progress reporting"),
125 OPT_CALLBACK_F(0, "recurse-submodules",
126 &recurse_submodules_cli
, N_("on-demand"),
127 N_("control for recursive fetching of submodules"),
128 PARSE_OPT_OPTARG
, option_fetch_parse_recurse_submodules
),
130 /* Options passed to git-merge or git-rebase */
131 OPT_GROUP(N_("Options related to merging")),
132 OPT_CALLBACK_F('r', "rebase", &opt_rebase
,
133 "(false|true|merges|interactive)",
134 N_("incorporate changes by rebasing rather than merging"),
135 PARSE_OPT_OPTARG
, parse_opt_rebase
),
136 OPT_PASSTHRU('n', NULL
, &opt_diffstat
, NULL
,
137 N_("do not show a diffstat at the end of the merge"),
138 PARSE_OPT_NOARG
| PARSE_OPT_NONEG
),
139 OPT_PASSTHRU(0, "stat", &opt_diffstat
, NULL
,
140 N_("show a diffstat at the end of the merge"),
142 OPT_PASSTHRU(0, "summary", &opt_diffstat
, NULL
,
143 N_("(synonym to --stat)"),
144 PARSE_OPT_NOARG
| PARSE_OPT_HIDDEN
),
145 OPT_PASSTHRU(0, "log", &opt_log
, N_("n"),
146 N_("add (at most <n>) entries from shortlog to merge commit message"),
148 OPT_PASSTHRU(0, "signoff", &opt_signoff
, NULL
,
149 N_("add a Signed-off-by trailer"),
151 OPT_PASSTHRU(0, "squash", &opt_squash
, NULL
,
152 N_("create a single commit instead of doing a merge"),
154 OPT_PASSTHRU(0, "commit", &opt_commit
, NULL
,
155 N_("perform a commit if the merge succeeds (default)"),
157 OPT_PASSTHRU(0, "edit", &opt_edit
, NULL
,
158 N_("edit message before committing"),
160 OPT_CLEANUP(&cleanup_arg
),
161 OPT_PASSTHRU(0, "ff", &opt_ff
, NULL
,
162 N_("allow fast-forward"),
164 OPT_PASSTHRU(0, "ff-only", &opt_ff
, NULL
,
165 N_("abort if fast-forward is not possible"),
166 PARSE_OPT_NOARG
| PARSE_OPT_NONEG
),
167 OPT_PASSTHRU(0, "verify", &opt_verify
, NULL
,
168 N_("control use of pre-merge-commit and commit-msg hooks"),
170 OPT_PASSTHRU(0, "verify-signatures", &opt_verify_signatures
, NULL
,
171 N_("verify that the named commit has a valid GPG signature"),
173 OPT_BOOL(0, "autostash", &opt_autostash
,
174 N_("automatically stash/stash pop before and after")),
175 OPT_PASSTHRU_ARGV('s', "strategy", &opt_strategies
, N_("strategy"),
176 N_("merge strategy to use"),
178 OPT_PASSTHRU_ARGV('X', "strategy-option", &opt_strategy_opts
,
180 N_("option for selected merge strategy"),
182 OPT_PASSTHRU('S', "gpg-sign", &opt_gpg_sign
, N_("key-id"),
183 N_("GPG sign commit"),
185 OPT_SET_INT(0, "allow-unrelated-histories",
186 &opt_allow_unrelated_histories
,
187 N_("allow merging unrelated histories"), 1),
189 /* Options passed to git-fetch */
190 OPT_GROUP(N_("Options related to fetching")),
191 OPT_PASSTHRU(0, "all", &opt_all
, NULL
,
192 N_("fetch from all remotes"),
194 OPT_PASSTHRU('a', "append", &opt_append
, NULL
,
195 N_("append to .git/FETCH_HEAD instead of overwriting"),
197 OPT_PASSTHRU(0, "upload-pack", &opt_upload_pack
, N_("path"),
198 N_("path to upload pack on remote end"),
200 OPT__FORCE(&opt_force
, N_("force overwrite of local branch"), 0),
201 OPT_PASSTHRU('t', "tags", &opt_tags
, NULL
,
202 N_("fetch all tags and associated objects"),
204 OPT_PASSTHRU('p', "prune", &opt_prune
, NULL
,
205 N_("prune remote-tracking branches no longer on remote"),
207 OPT_PASSTHRU('j', "jobs", &max_children
, N_("n"),
208 N_("number of submodules pulled in parallel"),
210 OPT_BOOL(0, "dry-run", &opt_dry_run
,
212 OPT_PASSTHRU('k', "keep", &opt_keep
, NULL
,
213 N_("keep downloaded pack"),
215 OPT_PASSTHRU(0, "depth", &opt_depth
, N_("depth"),
216 N_("deepen history of shallow clone"),
218 OPT_PASSTHRU_ARGV(0, "shallow-since", &opt_fetch
, N_("time"),
219 N_("deepen history of shallow repository based on time"),
221 OPT_PASSTHRU_ARGV(0, "shallow-exclude", &opt_fetch
, N_("revision"),
222 N_("deepen history of shallow clone, excluding rev"),
224 OPT_PASSTHRU_ARGV(0, "deepen", &opt_fetch
, N_("n"),
225 N_("deepen history of shallow clone"),
227 OPT_PASSTHRU(0, "unshallow", &opt_unshallow
, NULL
,
228 N_("convert to a complete repository"),
229 PARSE_OPT_NONEG
| PARSE_OPT_NOARG
),
230 OPT_PASSTHRU(0, "update-shallow", &opt_update_shallow
, NULL
,
231 N_("accept refs that update .git/shallow"),
233 OPT_PASSTHRU(0, "refmap", &opt_refmap
, N_("refmap"),
234 N_("specify fetch refmap"),
236 OPT_PASSTHRU_ARGV('o', "server-option", &opt_fetch
,
237 N_("server-specific"),
238 N_("option to transmit"),
240 OPT_PASSTHRU('4', "ipv4", &opt_ipv4
, NULL
,
241 N_("use IPv4 addresses only"),
243 OPT_PASSTHRU('6', "ipv6", &opt_ipv6
, NULL
,
244 N_("use IPv6 addresses only"),
246 OPT_PASSTHRU_ARGV(0, "negotiation-tip", &opt_fetch
, N_("revision"),
247 N_("report that we have only objects reachable from this object"),
249 OPT_BOOL(0, "show-forced-updates", &opt_show_forced_updates
,
250 N_("check for forced-updates on all updated branches")),
251 OPT_PASSTHRU(0, "set-upstream", &set_upstream
, NULL
,
252 N_("set upstream for git pull/fetch"),
259 * Pushes "-q" or "-v" switches into arr to match the opt_verbosity level.
261 static void argv_push_verbosity(struct strvec
*arr
)
265 for (verbosity
= opt_verbosity
; verbosity
> 0; verbosity
--)
266 strvec_push(arr
, "-v");
268 for (verbosity
= opt_verbosity
; verbosity
< 0; verbosity
++)
269 strvec_push(arr
, "-q");
273 * Pushes "-f" switches into arr to match the opt_force level.
275 static void argv_push_force(struct strvec
*arr
)
277 int force
= opt_force
;
279 strvec_push(arr
, "-f");
283 * Sets the GIT_REFLOG_ACTION environment variable to the concatenation of argv
285 static void set_reflog_message(int argc
, const char **argv
)
288 struct strbuf msg
= STRBUF_INIT
;
290 for (i
= 0; i
< argc
; i
++) {
292 strbuf_addch(&msg
, ' ');
293 strbuf_addstr(&msg
, argv
[i
]);
296 setenv("GIT_REFLOG_ACTION", msg
.buf
, 0);
298 strbuf_release(&msg
);
302 * If pull.ff is unset, returns NULL. If pull.ff is "true", returns "--ff". If
303 * pull.ff is "false", returns "--no-ff". If pull.ff is "only", returns
304 * "--ff-only". Otherwise, if pull.ff is set to an invalid value, die with an
307 static const char *config_get_ff(void)
311 if (git_config_get_value("pull.ff", &value
))
314 switch (git_parse_maybe_bool(value
)) {
321 if (!strcmp(value
, "only"))
324 die(_("invalid value for '%s': '%s'"), "pull.ff", value
);
328 * Returns the default configured value for --rebase. It first looks for the
329 * value of "branch.$curr_branch.rebase", where $curr_branch is the current
330 * branch, and if HEAD is detached or the configuration key does not exist,
331 * looks for the value of "pull.rebase". If both configuration keys do not
332 * exist, returns REBASE_FALSE.
334 static enum rebase_type
config_get_rebase(int *rebase_unspecified
)
336 struct branch
*curr_branch
= branch_get("HEAD");
340 char *key
= xstrfmt("branch.%s.rebase", curr_branch
->name
);
342 if (!git_config_get_value(key
, &value
)) {
343 enum rebase_type ret
= parse_config_rebase(key
, value
, 1);
351 if (!git_config_get_value("pull.rebase", &value
))
352 return parse_config_rebase("pull.rebase", value
, 1);
354 *rebase_unspecified
= 1;
360 * Read config variables.
362 static int git_pull_config(const char *var
, const char *value
, void *cb
)
364 if (!strcmp(var
, "rebase.autostash")) {
365 config_autostash
= git_config_bool(var
, value
);
367 } else if (!strcmp(var
, "submodule.recurse")) {
368 recurse_submodules
= git_config_bool(var
, value
) ?
369 RECURSE_SUBMODULES_ON
: RECURSE_SUBMODULES_OFF
;
371 } else if (!strcmp(var
, "gpg.mintrustlevel")) {
372 check_trust_level
= 0;
375 return git_default_config(var
, value
, cb
);
379 * Appends merge candidates from FETCH_HEAD that are not marked not-for-merge
382 static void get_merge_heads(struct oid_array
*merge_heads
)
384 const char *filename
= git_path_fetch_head(the_repository
);
386 struct strbuf sb
= STRBUF_INIT
;
387 struct object_id oid
;
389 fp
= xfopen(filename
, "r");
390 while (strbuf_getline_lf(&sb
, fp
) != EOF
) {
392 if (parse_oid_hex(sb
.buf
, &oid
, &p
))
393 continue; /* invalid line: does not start with object ID */
394 if (starts_with(p
, "\tnot-for-merge\t"))
395 continue; /* ref is not-for-merge */
396 oid_array_append(merge_heads
, &oid
);
403 * Used by die_no_merge_candidates() as a for_each_remote() callback to
404 * retrieve the name of the remote if the repository only has one remote.
406 static int get_only_remote(struct remote
*remote
, void *cb_data
)
408 const char **remote_name
= cb_data
;
413 *remote_name
= remote
->name
;
418 * Dies with the appropriate reason for why there are no merge candidates:
420 * 1. We fetched from a specific remote, and a refspec was given, but it ended
421 * up not fetching anything. This is usually because the user provided a
422 * wildcard refspec which had no matches on the remote end.
424 * 2. We fetched from a non-default remote, but didn't specify a branch to
425 * merge. We can't use the configured one because it applies to the default
426 * remote, thus the user must specify the branches to merge.
428 * 3. We fetched from the branch's or repo's default remote, but:
430 * a. We are not on a branch, so there will never be a configured branch to
433 * b. We are on a branch, but there is no configured branch to merge with.
435 * 4. We fetched from the branch's or repo's default remote, but the configured
436 * branch to merge didn't get fetched. (Either it doesn't exist, or wasn't
437 * part of the configured fetch refspec.)
439 static void NORETURN
die_no_merge_candidates(const char *repo
, const char **refspecs
)
441 struct branch
*curr_branch
= branch_get("HEAD");
442 const char *remote
= curr_branch
? curr_branch
->remote_name
: NULL
;
446 fprintf_ln(stderr
, _("There is no candidate for rebasing against among the refs that you just fetched."));
448 fprintf_ln(stderr
, _("There are no candidates for merging among the refs that you just fetched."));
449 fprintf_ln(stderr
, _("Generally this means that you provided a wildcard refspec which had no\n"
450 "matches on the remote end."));
451 } else if (repo
&& curr_branch
&& (!remote
|| strcmp(repo
, remote
))) {
452 fprintf_ln(stderr
, _("You asked to pull from the remote '%s', but did not specify\n"
453 "a branch. Because this is not the default configured remote\n"
454 "for your current branch, you must specify a branch on the command line."),
456 } else if (!curr_branch
) {
457 fprintf_ln(stderr
, _("You are not currently on a branch."));
459 fprintf_ln(stderr
, _("Please specify which branch you want to rebase against."));
461 fprintf_ln(stderr
, _("Please specify which branch you want to merge with."));
462 fprintf_ln(stderr
, _("See git-pull(1) for details."));
463 fprintf(stderr
, "\n");
464 fprintf_ln(stderr
, " git pull %s %s", _("<remote>"), _("<branch>"));
465 fprintf(stderr
, "\n");
466 } else if (!curr_branch
->merge_nr
) {
467 const char *remote_name
= NULL
;
469 if (for_each_remote(get_only_remote
, &remote_name
) || !remote_name
)
470 remote_name
= _("<remote>");
472 fprintf_ln(stderr
, _("There is no tracking information for the current branch."));
474 fprintf_ln(stderr
, _("Please specify which branch you want to rebase against."));
476 fprintf_ln(stderr
, _("Please specify which branch you want to merge with."));
477 fprintf_ln(stderr
, _("See git-pull(1) for details."));
478 fprintf(stderr
, "\n");
479 fprintf_ln(stderr
, " git pull %s %s", _("<remote>"), _("<branch>"));
480 fprintf(stderr
, "\n");
481 fprintf_ln(stderr
, _("If you wish to set tracking information for this branch you can do so with:"));
482 fprintf(stderr
, "\n");
483 fprintf_ln(stderr
, " git branch --set-upstream-to=%s/%s %s\n",
484 remote_name
, _("<branch>"), curr_branch
->name
);
486 fprintf_ln(stderr
, _("Your configuration specifies to merge with the ref '%s'\n"
487 "from the remote, but no such ref was fetched."),
488 *curr_branch
->merge_name
);
493 * Parses argv into [<repo> [<refspecs>...]], returning their values in `repo`
494 * as a string and `refspecs` as a null-terminated array of strings. If `repo`
495 * is not provided in argv, it is set to NULL.
497 static void parse_repo_refspecs(int argc
, const char **argv
, const char **repo
,
498 const char ***refspecs
)
509 * Runs git-fetch, returning its exit status. `repo` and `refspecs` are the
510 * repository and refspecs to fetch, or NULL if they are not provided.
512 static int run_fetch(const char *repo
, const char **refspecs
)
514 struct child_process cmd
= CHILD_PROCESS_INIT
;
516 strvec_pushl(&cmd
.args
, "fetch", "--update-head-ok", NULL
);
519 argv_push_verbosity(&cmd
.args
);
521 strvec_push(&cmd
.args
, opt_progress
);
523 /* Options passed to git-fetch */
525 strvec_push(&cmd
.args
, opt_all
);
527 strvec_push(&cmd
.args
, opt_append
);
529 strvec_push(&cmd
.args
, opt_upload_pack
);
530 argv_push_force(&cmd
.args
);
532 strvec_push(&cmd
.args
, opt_tags
);
534 strvec_push(&cmd
.args
, opt_prune
);
535 if (recurse_submodules_cli
!= RECURSE_SUBMODULES_DEFAULT
)
536 switch (recurse_submodules_cli
) {
537 case RECURSE_SUBMODULES_ON
:
538 strvec_push(&cmd
.args
, "--recurse-submodules=on");
540 case RECURSE_SUBMODULES_OFF
:
541 strvec_push(&cmd
.args
, "--recurse-submodules=no");
543 case RECURSE_SUBMODULES_ON_DEMAND
:
544 strvec_push(&cmd
.args
, "--recurse-submodules=on-demand");
547 BUG("submodule recursion option not understood");
550 strvec_push(&cmd
.args
, max_children
);
552 strvec_push(&cmd
.args
, "--dry-run");
554 strvec_push(&cmd
.args
, opt_keep
);
556 strvec_push(&cmd
.args
, opt_depth
);
558 strvec_push(&cmd
.args
, opt_unshallow
);
559 if (opt_update_shallow
)
560 strvec_push(&cmd
.args
, opt_update_shallow
);
562 strvec_push(&cmd
.args
, opt_refmap
);
564 strvec_push(&cmd
.args
, opt_ipv4
);
566 strvec_push(&cmd
.args
, opt_ipv6
);
567 if (opt_show_forced_updates
> 0)
568 strvec_push(&cmd
.args
, "--show-forced-updates");
569 else if (opt_show_forced_updates
== 0)
570 strvec_push(&cmd
.args
, "--no-show-forced-updates");
572 strvec_push(&cmd
.args
, set_upstream
);
573 strvec_pushv(&cmd
.args
, opt_fetch
.v
);
576 strvec_push(&cmd
.args
, repo
);
577 strvec_pushv(&cmd
.args
, refspecs
);
578 } else if (*refspecs
)
579 BUG("refspecs without repo?");
581 cmd
.close_object_store
= 1;
582 return run_command(&cmd
);
586 * "Pulls into void" by branching off merge_head.
588 static int pull_into_void(const struct object_id
*merge_head
,
589 const struct object_id
*curr_head
)
591 if (opt_verify_signatures
) {
592 struct commit
*commit
;
594 commit
= lookup_commit(the_repository
, merge_head
);
596 die(_("unable to access commit %s"),
597 oid_to_hex(merge_head
));
599 verify_merge_signature(commit
, opt_verbosity
,
604 * Two-way merge: we treat the index as based on an empty tree,
605 * and try to fast-forward to HEAD. This ensures we will not lose
606 * index/worktree changes that the user already made on the unborn
609 if (checkout_fast_forward(the_repository
,
610 the_hash_algo
->empty_tree
,
614 if (update_ref("initial pull", "HEAD", merge_head
, curr_head
, 0, UPDATE_REFS_DIE_ON_ERR
))
620 static int rebase_submodules(void)
622 struct child_process cp
= CHILD_PROCESS_INIT
;
626 strvec_pushl(&cp
.args
, "submodule", "update",
627 "--recursive", "--rebase", NULL
);
628 argv_push_verbosity(&cp
.args
);
630 return run_command(&cp
);
633 static int update_submodules(void)
635 struct child_process cp
= CHILD_PROCESS_INIT
;
639 strvec_pushl(&cp
.args
, "submodule", "update",
640 "--recursive", "--checkout", NULL
);
641 argv_push_verbosity(&cp
.args
);
643 return run_command(&cp
);
647 * Runs git-merge, returning its exit status.
649 static int run_merge(void)
651 struct child_process cmd
= CHILD_PROCESS_INIT
;
653 strvec_pushl(&cmd
.args
, "merge", NULL
);
656 argv_push_verbosity(&cmd
.args
);
658 strvec_push(&cmd
.args
, opt_progress
);
660 /* Options passed to git-merge */
662 strvec_push(&cmd
.args
, opt_diffstat
);
664 strvec_push(&cmd
.args
, opt_log
);
666 strvec_push(&cmd
.args
, opt_signoff
);
668 strvec_push(&cmd
.args
, opt_squash
);
670 strvec_push(&cmd
.args
, opt_commit
);
672 strvec_push(&cmd
.args
, opt_edit
);
674 strvec_pushf(&cmd
.args
, "--cleanup=%s", cleanup_arg
);
676 strvec_push(&cmd
.args
, opt_ff
);
678 strvec_push(&cmd
.args
, opt_verify
);
679 if (opt_verify_signatures
)
680 strvec_push(&cmd
.args
, opt_verify_signatures
);
681 strvec_pushv(&cmd
.args
, opt_strategies
.v
);
682 strvec_pushv(&cmd
.args
, opt_strategy_opts
.v
);
684 strvec_push(&cmd
.args
, opt_gpg_sign
);
685 if (opt_autostash
== 0)
686 strvec_push(&cmd
.args
, "--no-autostash");
687 else if (opt_autostash
== 1)
688 strvec_push(&cmd
.args
, "--autostash");
689 if (opt_allow_unrelated_histories
> 0)
690 strvec_push(&cmd
.args
, "--allow-unrelated-histories");
692 strvec_push(&cmd
.args
, "FETCH_HEAD");
694 return run_command(&cmd
);
698 * Returns remote's upstream branch for the current branch. If remote is NULL,
699 * the current branch's configured default remote is used. Returns NULL if
700 * `remote` does not name a valid remote, HEAD does not point to a branch,
701 * remote is not the branch's configured remote or the branch does not have any
702 * configured upstream branch.
704 static const char *get_upstream_branch(const char *remote
)
707 struct branch
*curr_branch
;
708 const char *curr_branch_remote
;
710 rm
= remote_get(remote
);
714 curr_branch
= branch_get("HEAD");
718 curr_branch_remote
= remote_for_branch(curr_branch
, NULL
);
719 assert(curr_branch_remote
);
721 if (strcmp(curr_branch_remote
, rm
->name
))
724 return branch_get_upstream(curr_branch
, NULL
);
728 * Derives the remote-tracking branch from the remote and refspec.
730 * FIXME: The current implementation assumes the default mapping of
731 * refs/heads/<branch_name> to refs/remotes/<remote_name>/<branch_name>.
733 static const char *get_tracking_branch(const char *remote
, const char *refspec
)
735 struct refspec_item spec
;
736 const char *spec_src
;
737 const char *merge_branch
;
739 refspec_item_init_or_die(&spec
, refspec
, REFSPEC_FETCH
);
741 if (!*spec_src
|| !strcmp(spec_src
, "HEAD"))
743 else if (skip_prefix(spec_src
, "heads/", &spec_src
))
745 else if (skip_prefix(spec_src
, "refs/heads/", &spec_src
))
747 else if (starts_with(spec_src
, "refs/") ||
748 starts_with(spec_src
, "tags/") ||
749 starts_with(spec_src
, "remotes/"))
753 if (!strcmp(remote
, "."))
754 merge_branch
= mkpath("refs/heads/%s", spec_src
);
756 merge_branch
= mkpath("refs/remotes/%s/%s", remote
, spec_src
);
760 refspec_item_clear(&spec
);
765 * Given the repo and refspecs, sets fork_point to the point at which the
766 * current branch forked from its remote-tracking branch. Returns 0 on success,
769 static int get_rebase_fork_point(struct object_id
*fork_point
, const char *repo
,
773 struct branch
*curr_branch
;
774 const char *remote_branch
;
775 struct child_process cp
= CHILD_PROCESS_INIT
;
776 struct strbuf sb
= STRBUF_INIT
;
778 curr_branch
= branch_get("HEAD");
783 remote_branch
= get_tracking_branch(repo
, refspec
);
785 remote_branch
= get_upstream_branch(repo
);
790 strvec_pushl(&cp
.args
, "merge-base", "--fork-point",
791 remote_branch
, curr_branch
->name
, NULL
);
796 ret
= capture_command(&cp
, &sb
, GIT_MAX_HEXSZ
);
800 ret
= get_oid_hex(sb
.buf
, fork_point
);
810 * Sets merge_base to the octopus merge base of curr_head, merge_head and
811 * fork_point. Returns 0 if a merge base is found, 1 otherwise.
813 static int get_octopus_merge_base(struct object_id
*merge_base
,
814 const struct object_id
*curr_head
,
815 const struct object_id
*merge_head
,
816 const struct object_id
*fork_point
)
818 struct commit_list
*revs
= NULL
, *result
;
820 commit_list_insert(lookup_commit_reference(the_repository
, curr_head
),
822 commit_list_insert(lookup_commit_reference(the_repository
, merge_head
),
824 if (!is_null_oid(fork_point
))
825 commit_list_insert(lookup_commit_reference(the_repository
, fork_point
),
828 result
= get_octopus_merge_bases(revs
);
829 free_commit_list(revs
);
830 reduce_heads_replace(&result
);
835 oidcpy(merge_base
, &result
->item
->object
.oid
);
836 free_commit_list(result
);
841 * Given the current HEAD oid, the merge head returned from git-fetch and the
842 * fork point calculated by get_rebase_fork_point(), compute the <newbase> and
843 * <upstream> arguments to use for the upcoming git-rebase invocation.
845 static int get_rebase_newbase_and_upstream(struct object_id
*newbase
,
846 struct object_id
*upstream
,
847 const struct object_id
*curr_head
,
848 const struct object_id
*merge_head
,
849 const struct object_id
*fork_point
)
851 struct object_id oct_merge_base
;
853 if (!get_octopus_merge_base(&oct_merge_base
, curr_head
, merge_head
, fork_point
))
854 if (!is_null_oid(fork_point
) && oideq(&oct_merge_base
, fork_point
))
857 if (fork_point
&& !is_null_oid(fork_point
))
858 oidcpy(upstream
, fork_point
);
860 oidcpy(upstream
, merge_head
);
862 oidcpy(newbase
, merge_head
);
868 * Given the <newbase> and <upstream> calculated by
869 * get_rebase_newbase_and_upstream(), runs git-rebase with the
870 * appropriate arguments and returns its exit status.
872 static int run_rebase(const struct object_id
*newbase
,
873 const struct object_id
*upstream
)
875 struct child_process cmd
= CHILD_PROCESS_INIT
;
877 strvec_push(&cmd
.args
, "rebase");
880 argv_push_verbosity(&cmd
.args
);
882 /* Options passed to git-rebase */
883 if (opt_rebase
== REBASE_MERGES
)
884 strvec_push(&cmd
.args
, "--rebase-merges");
885 else if (opt_rebase
== REBASE_INTERACTIVE
)
886 strvec_push(&cmd
.args
, "--interactive");
888 strvec_push(&cmd
.args
, opt_diffstat
);
889 strvec_pushv(&cmd
.args
, opt_strategies
.v
);
890 strvec_pushv(&cmd
.args
, opt_strategy_opts
.v
);
892 strvec_push(&cmd
.args
, opt_gpg_sign
);
894 strvec_push(&cmd
.args
, opt_signoff
);
895 if (opt_autostash
== 0)
896 strvec_push(&cmd
.args
, "--no-autostash");
897 else if (opt_autostash
== 1)
898 strvec_push(&cmd
.args
, "--autostash");
899 if (opt_verify_signatures
&&
900 !strcmp(opt_verify_signatures
, "--verify-signatures"))
901 warning(_("ignoring --verify-signatures for rebase"));
903 strvec_push(&cmd
.args
, "--onto");
904 strvec_push(&cmd
.args
, oid_to_hex(newbase
));
906 strvec_push(&cmd
.args
, oid_to_hex(upstream
));
909 return run_command(&cmd
);
912 static int get_can_ff(struct object_id
*orig_head
,
913 struct oid_array
*merge_heads
)
916 struct commit_list
*list
= NULL
;
917 struct commit
*merge_head
, *head
;
918 struct object_id
*orig_merge_head
;
920 if (merge_heads
->nr
> 1)
923 orig_merge_head
= &merge_heads
->oid
[0];
924 head
= lookup_commit_reference(the_repository
, orig_head
);
925 commit_list_insert(head
, &list
);
926 merge_head
= lookup_commit_reference(the_repository
, orig_merge_head
);
927 ret
= repo_is_descendant_of(the_repository
, merge_head
, list
);
928 free_commit_list(list
);
933 * Is orig_head a descendant of _all_ merge_heads?
934 * Unfortunately is_descendant_of() cannot be used as it asks
935 * if orig_head is a descendant of at least one of them.
937 static int already_up_to_date(struct object_id
*orig_head
,
938 struct oid_array
*merge_heads
)
943 ours
= lookup_commit_reference(the_repository
, orig_head
);
944 for (i
= 0; i
< merge_heads
->nr
; i
++) {
945 struct commit_list
*list
= NULL
;
946 struct commit
*theirs
;
949 theirs
= lookup_commit_reference(the_repository
, &merge_heads
->oid
[i
]);
950 commit_list_insert(theirs
, &list
);
951 ok
= repo_is_descendant_of(the_repository
, ours
, list
);
952 free_commit_list(list
);
959 static void show_advice_pull_non_ff(void)
961 advise(_("You have divergent branches and need to specify how to reconcile them.\n"
962 "You can do so by running one of the following commands sometime before\n"
965 " git config pull.rebase false # merge\n"
966 " git config pull.rebase true # rebase\n"
967 " git config pull.ff only # fast-forward only\n"
969 "You can replace \"git config\" with \"git config --global\" to set a default\n"
970 "preference for all repositories. You can also pass --rebase, --no-rebase,\n"
971 "or --ff-only on the command line to override the configured default per\n"
975 int cmd_pull(int argc
, const char **argv
, const char *prefix
)
977 const char *repo
, **refspecs
;
978 struct oid_array merge_heads
= OID_ARRAY_INIT
;
979 struct object_id orig_head
, curr_head
;
980 struct object_id rebase_fork_point
;
981 int rebase_unspecified
= 0;
986 if (!getenv("GIT_REFLOG_ACTION"))
987 set_reflog_message(argc
, argv
);
989 git_config(git_pull_config
, NULL
);
990 if (the_repository
->gitdir
) {
991 prepare_repo_settings(the_repository
);
992 the_repository
->settings
.command_requires_full_index
= 0;
995 argc
= parse_options(argc
, argv
, prefix
, pull_options
, pull_usage
, 0);
997 if (recurse_submodules_cli
!= RECURSE_SUBMODULES_DEFAULT
)
998 recurse_submodules
= recurse_submodules_cli
;
1002 * this only checks the validity of cleanup_arg; we don't need
1003 * a valid value for use_editor
1005 get_cleanup_mode(cleanup_arg
, 0);
1007 parse_repo_refspecs(argc
, argv
, &repo
, &refspecs
);
1010 opt_ff
= xstrdup_or_null(config_get_ff());
1012 * A subtle point: opt_ff was set on the line above via
1013 * reading from config. opt_rebase, in contrast, is set
1014 * before this point via command line options. The setting
1015 * of opt_rebase via reading from config (using
1016 * config_get_rebase()) does not happen until later. We
1017 * are relying on the next if-condition happening before
1018 * the config_get_rebase() call so that an explicit
1019 * "--rebase" can override a config setting of
1022 if (opt_rebase
>= 0 && opt_ff
&& !strcmp(opt_ff
, "--ff-only"))
1027 opt_rebase
= config_get_rebase(&rebase_unspecified
);
1029 if (repo_read_index_unmerged(the_repository
))
1030 die_resolve_conflict("pull");
1032 if (file_exists(git_path_merge_head(the_repository
)))
1033 die_conclude_merge();
1035 if (repo_get_oid(the_repository
, "HEAD", &orig_head
))
1039 if (opt_autostash
== -1)
1040 opt_autostash
= config_autostash
;
1042 if (is_null_oid(&orig_head
) && !is_index_unborn(&the_index
))
1043 die(_("Updating an unborn branch with changes added to the index."));
1046 require_clean_work_tree(the_repository
,
1047 N_("pull with rebase"),
1048 _("please commit or stash them."), 1, 0);
1050 if (get_rebase_fork_point(&rebase_fork_point
, repo
, *refspecs
))
1051 oidclr(&rebase_fork_point
);
1054 if (run_fetch(repo
, refspecs
))
1060 if (repo_get_oid(the_repository
, "HEAD", &curr_head
))
1063 if (!is_null_oid(&orig_head
) && !is_null_oid(&curr_head
) &&
1064 !oideq(&orig_head
, &curr_head
)) {
1066 * The fetch involved updating the current branch.
1068 * The working tree and the index file are still based on
1069 * orig_head commit, but we are merging into curr_head.
1070 * Update the working tree to match curr_head.
1073 warning(_("fetch updated the current branch head.\n"
1074 "fast-forwarding your working tree from\n"
1075 "commit %s."), oid_to_hex(&orig_head
));
1077 if (checkout_fast_forward(the_repository
, &orig_head
,
1079 die(_("Cannot fast-forward your working tree.\n"
1080 "After making sure that you saved anything precious from\n"
1083 "$ git reset --hard\n"
1084 "to recover."), oid_to_hex(&orig_head
));
1087 get_merge_heads(&merge_heads
);
1089 if (!merge_heads
.nr
)
1090 die_no_merge_candidates(repo
, refspecs
);
1092 if (is_null_oid(&orig_head
)) {
1093 if (merge_heads
.nr
> 1)
1094 die(_("Cannot merge multiple branches into empty head."));
1095 ret
= pull_into_void(merge_heads
.oid
, &curr_head
);
1098 if (merge_heads
.nr
> 1) {
1100 die(_("Cannot rebase onto multiple branches."));
1101 if (opt_ff
&& !strcmp(opt_ff
, "--ff-only"))
1102 die(_("Cannot fast-forward to multiple branches."));
1105 can_ff
= get_can_ff(&orig_head
, &merge_heads
);
1106 divergent
= !can_ff
&& !already_up_to_date(&orig_head
, &merge_heads
);
1108 /* ff-only takes precedence over rebase */
1109 if (opt_ff
&& !strcmp(opt_ff
, "--ff-only")) {
1111 die_ff_impossible();
1112 opt_rebase
= REBASE_FALSE
;
1114 /* If no action specified and we can't fast forward, then warn. */
1115 if (!opt_ff
&& rebase_unspecified
&& divergent
) {
1116 show_advice_pull_non_ff();
1117 die(_("Need to specify how to reconcile divergent branches."));
1121 struct object_id newbase
;
1122 struct object_id upstream
;
1123 get_rebase_newbase_and_upstream(&newbase
, &upstream
, &curr_head
,
1124 merge_heads
.oid
, &rebase_fork_point
);
1126 if ((recurse_submodules
== RECURSE_SUBMODULES_ON
||
1127 recurse_submodules
== RECURSE_SUBMODULES_ON_DEMAND
) &&
1128 submodule_touches_in_range(the_repository
, &upstream
, &curr_head
))
1129 die(_("cannot rebase with locally recorded submodule modifications"));
1132 /* we can fast-forward this without invoking rebase */
1133 opt_ff
= "--ff-only";
1136 ret
= run_rebase(&newbase
, &upstream
);
1139 if (!ret
&& (recurse_submodules
== RECURSE_SUBMODULES_ON
||
1140 recurse_submodules
== RECURSE_SUBMODULES_ON_DEMAND
))
1141 ret
= rebase_submodules();
1146 if (!ret
&& (recurse_submodules
== RECURSE_SUBMODULES_ON
||
1147 recurse_submodules
== RECURSE_SUBMODULES_ON_DEMAND
))
1148 ret
= update_submodules();
1153 oid_array_clear(&merge_heads
);