4 #include "run-command.h"
9 #include "string-list.h"
10 #include "thread-utils.h"
12 #include "argv-array.h"
19 struct child_process
*helper
;
29 check_connectivity
: 1,
30 no_disconnect_req
: 1,
31 no_private_update
: 1;
34 /* These go from remote name (as in "list") to private name */
35 struct refspec
*refspecs
;
37 /* Transport options for fetch-pack/send-pack (should one of
40 struct git_transport_options transport_options
;
43 static void sendline(struct helper_data
*helper
, struct strbuf
*buffer
)
46 fprintf(stderr
, "Debug: Remote helper: -> %s", buffer
->buf
);
47 if (write_in_full(helper
->helper
->in
, buffer
->buf
, buffer
->len
)
49 die_errno("Full write to remote helper failed");
52 static int recvline_fh(FILE *helper
, struct strbuf
*buffer
, const char *name
)
56 fprintf(stderr
, "Debug: Remote helper: Waiting...\n");
57 if (strbuf_getline(buffer
, helper
) == EOF
) {
59 fprintf(stderr
, "Debug: Remote helper quit.\n");
64 fprintf(stderr
, "Debug: Remote helper: <- %s\n", buffer
->buf
);
68 static int recvline(struct helper_data
*helper
, struct strbuf
*buffer
)
70 return recvline_fh(helper
->out
, buffer
, helper
->name
);
73 static void write_constant(int fd
, const char *str
)
76 fprintf(stderr
, "Debug: Remote helper: -> %s", str
);
77 if (write_in_full(fd
, str
, strlen(str
)) != strlen(str
))
78 die_errno("Full write to remote helper failed");
81 static const char *remove_ext_force(const char *url
)
84 const char *colon
= strchr(url
, ':');
85 if (colon
&& colon
[1] == ':')
91 static void do_take_over(struct transport
*transport
)
93 struct helper_data
*data
;
94 data
= (struct helper_data
*)transport
->data
;
95 transport_take_over(transport
, data
->helper
);
100 static void standard_options(struct transport
*t
);
102 static struct child_process
*get_helper(struct transport
*transport
)
104 struct helper_data
*data
= transport
->data
;
105 struct strbuf buf
= STRBUF_INIT
;
106 struct child_process
*helper
;
107 const char **refspecs
= NULL
;
109 int refspec_alloc
= 0;
116 helper
= xmalloc(sizeof(*helper
));
117 child_process_init(helper
);
121 argv_array_pushf(&helper
->args
, "git-remote-%s", data
->name
);
122 argv_array_push(&helper
->args
, transport
->remote
->name
);
123 argv_array_push(&helper
->args
, remove_ext_force(transport
->url
));
125 helper
->silent_exec_failure
= 1;
128 argv_array_pushf(&helper
->env_array
, "%s=%s",
129 GIT_DIR_ENVIRONMENT
, get_git_dir());
131 code
= start_command(helper
);
132 if (code
< 0 && errno
== ENOENT
)
133 die("Unable to find remote helper for '%s'", data
->name
);
137 data
->helper
= helper
;
138 data
->no_disconnect_req
= 0;
141 * Open the output as FILE* so strbuf_getline_*() family of
142 * functions can be used.
143 * Do this with duped fd because fclose() will close the fd,
144 * and stuff like taking over will require the fd to remain.
146 duped
= dup(helper
->out
);
148 die_errno("Can't dup helper output fd");
149 data
->out
= xfdopen(duped
, "r");
151 write_constant(helper
->in
, "capabilities\n");
154 const char *capname
, *arg
;
156 if (recvline(data
, &buf
))
162 if (*buf
.buf
== '*') {
163 capname
= buf
.buf
+ 1;
169 fprintf(stderr
, "Debug: Got cap %s\n", capname
);
170 if (!strcmp(capname
, "fetch"))
172 else if (!strcmp(capname
, "option"))
174 else if (!strcmp(capname
, "push"))
176 else if (!strcmp(capname
, "import"))
178 else if (!strcmp(capname
, "bidi-import"))
179 data
->bidi_import
= 1;
180 else if (!strcmp(capname
, "export"))
182 else if (!strcmp(capname
, "check-connectivity"))
183 data
->check_connectivity
= 1;
184 else if (!data
->refspecs
&& skip_prefix(capname
, "refspec ", &arg
)) {
188 refspecs
[refspec_nr
++] = xstrdup(arg
);
189 } else if (!strcmp(capname
, "connect")) {
191 } else if (!strcmp(capname
, "signed-tags")) {
192 data
->signed_tags
= 1;
193 } else if (skip_prefix(capname
, "export-marks ", &arg
)) {
194 data
->export_marks
= xstrdup(arg
);
195 } else if (skip_prefix(capname
, "import-marks ", &arg
)) {
196 data
->import_marks
= xstrdup(arg
);
197 } else if (starts_with(capname
, "no-private-update")) {
198 data
->no_private_update
= 1;
199 } else if (mandatory
) {
200 die("Unknown mandatory capability %s. This remote "
201 "helper probably needs newer version of Git.",
207 data
->refspec_nr
= refspec_nr
;
208 data
->refspecs
= parse_fetch_refspec(refspec_nr
, refspecs
);
209 for (i
= 0; i
< refspec_nr
; i
++)
210 free((char *)refspecs
[i
]);
212 } else if (data
->import
|| data
->bidi_import
|| data
->export
) {
213 warning("This remote helper should implement refspec capability.");
215 strbuf_release(&buf
);
217 fprintf(stderr
, "Debug: Capabilities complete.\n");
218 standard_options(transport
);
222 static int disconnect_helper(struct transport
*transport
)
224 struct helper_data
*data
= transport
->data
;
229 fprintf(stderr
, "Debug: Disconnecting.\n");
230 if (!data
->no_disconnect_req
) {
232 * Ignore write errors; there's nothing we can do,
233 * since we're about to close the pipe anyway. And the
234 * most likely error is EPIPE due to the helper dying
235 * to report an error itself.
237 sigchain_push(SIGPIPE
, SIG_IGN
);
238 xwrite(data
->helper
->in
, "\n", 1);
239 sigchain_pop(SIGPIPE
);
241 close(data
->helper
->in
);
242 close(data
->helper
->out
);
244 res
= finish_command(data
->helper
);
251 static const char *unsupported_options
[] = {
252 TRANS_OPT_UPLOADPACK
,
253 TRANS_OPT_RECEIVEPACK
,
258 static const char *boolean_options
[] = {
261 TRANS_OPT_FOLLOWTAGS
,
262 TRANS_OPT_DEEPEN_RELATIVE
265 static int strbuf_set_helper_option(struct helper_data
*data
,
271 if (recvline(data
, buf
))
274 if (!strcmp(buf
->buf
, "ok"))
276 else if (starts_with(buf
->buf
, "error"))
278 else if (!strcmp(buf
->buf
, "unsupported"))
281 warning("%s unexpectedly said: '%s'", data
->name
, buf
->buf
);
287 static int string_list_set_helper_option(struct helper_data
*data
,
289 struct string_list
*list
)
291 struct strbuf buf
= STRBUF_INIT
;
294 for (i
= 0; i
< list
->nr
; i
++) {
295 strbuf_addf(&buf
, "option %s ", name
);
296 quote_c_style(list
->items
[i
].string
, &buf
, NULL
, 0);
297 strbuf_addch(&buf
, '\n');
299 if ((ret
= strbuf_set_helper_option(data
, &buf
)))
303 strbuf_release(&buf
);
307 static int set_helper_option(struct transport
*transport
,
308 const char *name
, const char *value
)
310 struct helper_data
*data
= transport
->data
;
311 struct strbuf buf
= STRBUF_INIT
;
312 int i
, ret
, is_bool
= 0;
314 get_helper(transport
);
319 if (!strcmp(name
, "deepen-not"))
320 return string_list_set_helper_option(data
, name
,
321 (struct string_list
*)value
);
323 for (i
= 0; i
< ARRAY_SIZE(unsupported_options
); i
++) {
324 if (!strcmp(name
, unsupported_options
[i
]))
328 for (i
= 0; i
< ARRAY_SIZE(boolean_options
); i
++) {
329 if (!strcmp(name
, boolean_options
[i
])) {
335 strbuf_addf(&buf
, "option %s ", name
);
337 strbuf_addstr(&buf
, value
? "true" : "false");
339 quote_c_style(value
, &buf
, NULL
, 0);
340 strbuf_addch(&buf
, '\n');
342 ret
= strbuf_set_helper_option(data
, &buf
);
343 strbuf_release(&buf
);
347 static void standard_options(struct transport
*t
)
353 set_helper_option(t
, "progress", t
->progress
? "true" : "false");
355 n
= snprintf(buf
, sizeof(buf
), "%d", v
+ 1);
356 if (n
>= sizeof(buf
))
357 die("impossibly large verbosity value");
358 set_helper_option(t
, "verbosity", buf
);
361 case TRANSPORT_FAMILY_ALL
:
363 * this is already the default,
364 * do not break old remote helpers by setting "all" here
367 case TRANSPORT_FAMILY_IPV4
:
368 set_helper_option(t
, "family", "ipv4");
370 case TRANSPORT_FAMILY_IPV6
:
371 set_helper_option(t
, "family", "ipv6");
376 static int release_helper(struct transport
*transport
)
379 struct helper_data
*data
= transport
->data
;
380 free_refspec(data
->refspec_nr
, data
->refspecs
);
381 data
->refspecs
= NULL
;
382 res
= disconnect_helper(transport
);
383 free(transport
->data
);
387 static int fetch_with_fetch(struct transport
*transport
,
388 int nr_heads
, struct ref
**to_fetch
)
390 struct helper_data
*data
= transport
->data
;
392 struct strbuf buf
= STRBUF_INIT
;
394 for (i
= 0; i
< nr_heads
; i
++) {
395 const struct ref
*posn
= to_fetch
[i
];
396 if (posn
->status
& REF_STATUS_UPTODATE
)
399 strbuf_addf(&buf
, "fetch %s %s\n",
400 oid_to_hex(&posn
->old_oid
),
401 posn
->symref
? posn
->symref
: posn
->name
);
404 strbuf_addch(&buf
, '\n');
405 sendline(data
, &buf
);
408 if (recvline(data
, &buf
))
411 if (starts_with(buf
.buf
, "lock ")) {
412 const char *name
= buf
.buf
+ 5;
413 if (transport
->pack_lockfile
)
414 warning("%s also locked %s", data
->name
, name
);
416 transport
->pack_lockfile
= xstrdup(name
);
418 else if (data
->check_connectivity
&&
419 data
->transport_options
.check_self_contained_and_connected
&&
420 !strcmp(buf
.buf
, "connectivity-ok"))
421 data
->transport_options
.self_contained_and_connected
= 1;
425 warning("%s unexpectedly said: '%s'", data
->name
, buf
.buf
);
427 strbuf_release(&buf
);
431 static int get_importer(struct transport
*transport
, struct child_process
*fastimport
)
433 struct child_process
*helper
= get_helper(transport
);
434 struct helper_data
*data
= transport
->data
;
435 int cat_blob_fd
, code
;
436 child_process_init(fastimport
);
437 fastimport
->in
= helper
->out
;
438 argv_array_push(&fastimport
->args
, "fast-import");
439 argv_array_push(&fastimport
->args
, debug
? "--stats" : "--quiet");
441 if (data
->bidi_import
) {
442 cat_blob_fd
= xdup(helper
->in
);
443 argv_array_pushf(&fastimport
->args
, "--cat-blob-fd=%d", cat_blob_fd
);
445 fastimport
->git_cmd
= 1;
447 code
= start_command(fastimport
);
451 static int get_exporter(struct transport
*transport
,
452 struct child_process
*fastexport
,
453 struct string_list
*revlist_args
)
455 struct helper_data
*data
= transport
->data
;
456 struct child_process
*helper
= get_helper(transport
);
459 child_process_init(fastexport
);
461 /* we need to duplicate helper->in because we want to use it after
462 * fastexport is done with it. */
463 fastexport
->out
= dup(helper
->in
);
464 argv_array_push(&fastexport
->args
, "fast-export");
465 argv_array_push(&fastexport
->args
, "--use-done-feature");
466 argv_array_push(&fastexport
->args
, data
->signed_tags
?
467 "--signed-tags=verbatim" : "--signed-tags=warn-strip");
468 if (data
->export_marks
)
469 argv_array_pushf(&fastexport
->args
, "--export-marks=%s.tmp", data
->export_marks
);
470 if (data
->import_marks
)
471 argv_array_pushf(&fastexport
->args
, "--import-marks=%s", data
->import_marks
);
473 for (i
= 0; i
< revlist_args
->nr
; i
++)
474 argv_array_push(&fastexport
->args
, revlist_args
->items
[i
].string
);
476 fastexport
->git_cmd
= 1;
477 return start_command(fastexport
);
480 static int fetch_with_import(struct transport
*transport
,
481 int nr_heads
, struct ref
**to_fetch
)
483 struct child_process fastimport
;
484 struct helper_data
*data
= transport
->data
;
487 struct strbuf buf
= STRBUF_INIT
;
489 get_helper(transport
);
491 if (get_importer(transport
, &fastimport
))
492 die("Couldn't run fast-import");
494 for (i
= 0; i
< nr_heads
; i
++) {
496 if (posn
->status
& REF_STATUS_UPTODATE
)
499 strbuf_addf(&buf
, "import %s\n",
500 posn
->symref
? posn
->symref
: posn
->name
);
501 sendline(data
, &buf
);
505 write_constant(data
->helper
->in
, "\n");
507 * remote-helpers that advertise the bidi-import capability are required to
508 * buffer the complete batch of import commands until this newline before
509 * sending data to fast-import.
510 * These helpers read back data from fast-import on their stdin, which could
511 * be mixed with import commands, otherwise.
514 if (finish_command(&fastimport
))
515 die("Error while running fast-import");
518 * The fast-import stream of a remote helper that advertises
519 * the "refspec" capability writes to the refs named after the
520 * right hand side of the first refspec matching each ref we
523 * (If no "refspec" capability was specified, for historical
524 * reasons we default to the equivalent of *:*.)
526 * Store the result in to_fetch[i].old_sha1. Callers such
527 * as "git fetch" can use the value to write feedback to the
528 * terminal, populate FETCH_HEAD, and determine what new value
529 * should be written to peer_ref if the update is a
530 * fast-forward or this is a forced update.
532 for (i
= 0; i
< nr_heads
; i
++) {
533 char *private, *name
;
535 if (posn
->status
& REF_STATUS_UPTODATE
)
537 name
= posn
->symref
? posn
->symref
: posn
->name
;
539 private = apply_refspecs(data
->refspecs
, data
->refspec_nr
, name
);
541 private = xstrdup(name
);
543 if (read_ref(private, posn
->old_oid
.hash
) < 0)
544 die("Could not read ref %s", private);
548 strbuf_release(&buf
);
552 static int process_connect_service(struct transport
*transport
,
553 const char *name
, const char *exec
)
555 struct helper_data
*data
= transport
->data
;
556 struct strbuf cmdbuf
= STRBUF_INIT
;
557 struct child_process
*helper
;
558 int r
, duped
, ret
= 0;
561 helper
= get_helper(transport
);
564 * Yes, dup the pipe another time, as we need unbuffered version
565 * of input pipe as FILE*. fclose() closes the underlying fd and
566 * stream buffering only can be changed before first I/O operation
569 duped
= dup(helper
->out
);
571 die_errno("Can't dup helper output fd");
572 input
= xfdopen(duped
, "r");
573 setvbuf(input
, NULL
, _IONBF
, 0);
576 * Handle --upload-pack and friends. This is fire and forget...
577 * just warn if it fails.
579 if (strcmp(name
, exec
)) {
580 r
= set_helper_option(transport
, "servpath", exec
);
582 warning("Setting remote service path not supported by protocol.");
584 warning("Invalid remote service path.");
588 strbuf_addf(&cmdbuf
, "connect %s\n", name
);
592 sendline(data
, &cmdbuf
);
593 if (recvline_fh(input
, &cmdbuf
, name
))
596 if (!strcmp(cmdbuf
.buf
, "")) {
597 data
->no_disconnect_req
= 1;
599 fprintf(stderr
, "Debug: Smart transport connection "
602 } else if (!strcmp(cmdbuf
.buf
, "fallback")) {
604 fprintf(stderr
, "Debug: Falling back to dumb "
607 die("Unknown response to connect: %s",
615 static int process_connect(struct transport
*transport
,
618 struct helper_data
*data
= transport
->data
;
622 name
= for_push
? "git-receive-pack" : "git-upload-pack";
624 exec
= data
->transport_options
.receivepack
;
626 exec
= data
->transport_options
.uploadpack
;
628 return process_connect_service(transport
, name
, exec
);
631 static int connect_helper(struct transport
*transport
, const char *name
,
632 const char *exec
, int fd
[2])
634 struct helper_data
*data
= transport
->data
;
636 /* Get_helper so connect is inited. */
637 get_helper(transport
);
639 die("Operation not supported by protocol.");
641 if (!process_connect_service(transport
, name
, exec
))
642 die("Can't connect to subservice %s.", name
);
644 fd
[0] = data
->helper
->out
;
645 fd
[1] = data
->helper
->in
;
649 static int fetch(struct transport
*transport
,
650 int nr_heads
, struct ref
**to_fetch
)
652 struct helper_data
*data
= transport
->data
;
655 if (process_connect(transport
, 0)) {
656 do_take_over(transport
);
657 return transport
->fetch(transport
, nr_heads
, to_fetch
);
661 for (i
= 0; i
< nr_heads
; i
++)
662 if (!(to_fetch
[i
]->status
& REF_STATUS_UPTODATE
))
668 if (data
->check_connectivity
&&
669 data
->transport_options
.check_self_contained_and_connected
)
670 set_helper_option(transport
, "check-connectivity", "true");
672 if (transport
->cloning
)
673 set_helper_option(transport
, "cloning", "true");
675 if (data
->transport_options
.update_shallow
)
676 set_helper_option(transport
, "update-shallow", "true");
679 return fetch_with_fetch(transport
, nr_heads
, to_fetch
);
682 return fetch_with_import(transport
, nr_heads
, to_fetch
);
687 static int push_update_ref_status(struct strbuf
*buf
,
689 struct ref
*remote_refs
)
692 int status
, forced
= 0;
694 if (starts_with(buf
->buf
, "ok ")) {
695 status
= REF_STATUS_OK
;
696 refname
= buf
->buf
+ 3;
697 } else if (starts_with(buf
->buf
, "error ")) {
698 status
= REF_STATUS_REMOTE_REJECT
;
699 refname
= buf
->buf
+ 6;
701 die("expected ok/error, helper said '%s'", buf
->buf
);
703 msg
= strchr(refname
, ' ');
705 struct strbuf msg_buf
= STRBUF_INIT
;
709 if (!unquote_c_style(&msg_buf
, msg
, &end
))
710 msg
= strbuf_detach(&msg_buf
, NULL
);
713 strbuf_release(&msg_buf
);
715 if (!strcmp(msg
, "no match")) {
716 status
= REF_STATUS_NONE
;
720 else if (!strcmp(msg
, "up to date")) {
721 status
= REF_STATUS_UPTODATE
;
725 else if (!strcmp(msg
, "non-fast forward")) {
726 status
= REF_STATUS_REJECT_NONFASTFORWARD
;
730 else if (!strcmp(msg
, "already exists")) {
731 status
= REF_STATUS_REJECT_ALREADY_EXISTS
;
735 else if (!strcmp(msg
, "fetch first")) {
736 status
= REF_STATUS_REJECT_FETCH_FIRST
;
740 else if (!strcmp(msg
, "needs force")) {
741 status
= REF_STATUS_REJECT_NEEDS_FORCE
;
745 else if (!strcmp(msg
, "stale info")) {
746 status
= REF_STATUS_REJECT_STALE
;
750 else if (!strcmp(msg
, "forced update")) {
758 *ref
= find_ref_by_name(*ref
, refname
);
760 *ref
= find_ref_by_name(remote_refs
, refname
);
762 warning("helper reported unexpected status of %s", refname
);
766 if ((*ref
)->status
!= REF_STATUS_NONE
) {
768 * Earlier, the ref was marked not to be pushed, so ignore the ref
769 * status reported by the remote helper if the latter is 'no match'.
771 if (status
== REF_STATUS_NONE
)
775 (*ref
)->status
= status
;
776 (*ref
)->forced_update
|= forced
;
777 (*ref
)->remote_status
= msg
;
778 return !(status
== REF_STATUS_OK
);
781 static int push_update_refs_status(struct helper_data
*data
,
782 struct ref
*remote_refs
,
785 struct strbuf buf
= STRBUF_INIT
;
786 struct ref
*ref
= remote_refs
;
792 if (recvline(data
, &buf
)) {
800 if (push_update_ref_status(&buf
, &ref
, remote_refs
))
803 if (flags
& TRANSPORT_PUSH_DRY_RUN
|| !data
->refspecs
|| data
->no_private_update
)
806 /* propagate back the update to the remote namespace */
807 private = apply_refspecs(data
->refspecs
, data
->refspec_nr
, ref
->name
);
810 update_ref("update by helper", private, ref
->new_oid
.hash
, NULL
, 0, 0);
813 strbuf_release(&buf
);
817 static void set_common_push_options(struct transport
*transport
,
818 const char *name
, int flags
)
820 if (flags
& TRANSPORT_PUSH_DRY_RUN
) {
821 if (set_helper_option(transport
, "dry-run", "true") != 0)
822 die("helper %s does not support dry-run", name
);
823 } else if (flags
& TRANSPORT_PUSH_CERT_ALWAYS
) {
824 if (set_helper_option(transport
, TRANS_OPT_PUSH_CERT
, "true") != 0)
825 die("helper %s does not support --signed", name
);
826 } else if (flags
& TRANSPORT_PUSH_CERT_IF_ASKED
) {
827 if (set_helper_option(transport
, TRANS_OPT_PUSH_CERT
, "if-asked") != 0)
828 die("helper %s does not support --signed=if-asked", name
);
832 static int push_refs_with_push(struct transport
*transport
,
833 struct ref
*remote_refs
, int flags
)
835 int force_all
= flags
& TRANSPORT_PUSH_FORCE
;
836 int mirror
= flags
& TRANSPORT_PUSH_MIRROR
;
837 struct helper_data
*data
= transport
->data
;
838 struct strbuf buf
= STRBUF_INIT
;
840 struct string_list cas_options
= STRING_LIST_INIT_DUP
;
841 struct string_list_item
*cas_option
;
843 get_helper(transport
);
847 for (ref
= remote_refs
; ref
; ref
= ref
->next
) {
848 if (!ref
->peer_ref
&& !mirror
)
851 /* Check for statuses set by set_ref_status_for_push() */
852 switch (ref
->status
) {
853 case REF_STATUS_REJECT_NONFASTFORWARD
:
854 case REF_STATUS_REJECT_STALE
:
855 case REF_STATUS_REJECT_ALREADY_EXISTS
:
856 case REF_STATUS_UPTODATE
:
865 strbuf_addstr(&buf
, "push ");
866 if (!ref
->deletion
) {
868 strbuf_addch(&buf
, '+');
870 strbuf_addstr(&buf
, ref
->peer_ref
->name
);
872 strbuf_addstr(&buf
, oid_to_hex(&ref
->new_oid
));
874 strbuf_addch(&buf
, ':');
875 strbuf_addstr(&buf
, ref
->name
);
876 strbuf_addch(&buf
, '\n');
879 * The "--force-with-lease" options without explicit
880 * values to expect have already been expanded into
881 * the ref->old_oid_expect[] field; we can ignore
882 * transport->smart_options->cas altogether and instead
883 * can enumerate them from the refs.
885 if (ref
->expect_old_sha1
) {
886 struct strbuf cas
= STRBUF_INIT
;
887 strbuf_addf(&cas
, "%s:%s",
888 ref
->name
, oid_to_hex(&ref
->old_oid_expect
));
889 string_list_append(&cas_options
, strbuf_detach(&cas
, NULL
));
893 string_list_clear(&cas_options
, 0);
897 for_each_string_list_item(cas_option
, &cas_options
)
898 set_helper_option(transport
, "cas", cas_option
->string
);
899 set_common_push_options(transport
, data
->name
, flags
);
901 strbuf_addch(&buf
, '\n');
902 sendline(data
, &buf
);
903 strbuf_release(&buf
);
905 return push_update_refs_status(data
, remote_refs
, flags
);
908 static int push_refs_with_export(struct transport
*transport
,
909 struct ref
*remote_refs
, int flags
)
912 struct child_process
*helper
, exporter
;
913 struct helper_data
*data
= transport
->data
;
914 struct string_list revlist_args
= STRING_LIST_INIT_DUP
;
915 struct strbuf buf
= STRBUF_INIT
;
918 die("remote-helper doesn't support push; refspec needed");
920 set_common_push_options(transport
, data
->name
, flags
);
921 if (flags
& TRANSPORT_PUSH_FORCE
) {
922 if (set_helper_option(transport
, "force", "true") != 0)
923 warning("helper %s does not support 'force'", data
->name
);
926 helper
= get_helper(transport
);
928 write_constant(helper
->in
, "export\n");
930 for (ref
= remote_refs
; ref
; ref
= ref
->next
) {
932 struct object_id oid
;
934 private = apply_refspecs(data
->refspecs
, data
->refspec_nr
, ref
->name
);
935 if (private && !get_sha1(private, oid
.hash
)) {
936 strbuf_addf(&buf
, "^%s", private);
937 string_list_append(&revlist_args
, strbuf_detach(&buf
, NULL
));
938 oidcpy(&ref
->old_oid
, &oid
);
943 if (strcmp(ref
->name
, ref
->peer_ref
->name
)) {
944 if (!ref
->deletion
) {
948 /* Follow symbolic refs (mainly for HEAD). */
949 name
= resolve_ref_unsafe(
953 if (!name
|| !(flag
& REF_ISSYMREF
))
954 name
= ref
->peer_ref
->name
;
956 strbuf_addf(&buf
, "%s:%s", name
, ref
->name
);
958 strbuf_addf(&buf
, ":%s", ref
->name
);
960 string_list_append(&revlist_args
, "--refspec");
961 string_list_append(&revlist_args
, buf
.buf
);
962 strbuf_release(&buf
);
965 string_list_append(&revlist_args
, ref
->peer_ref
->name
);
969 if (get_exporter(transport
, &exporter
, &revlist_args
))
970 die("Couldn't run fast-export");
972 string_list_clear(&revlist_args
, 1);
974 if (finish_command(&exporter
))
975 die("Error while running fast-export");
976 if (push_update_refs_status(data
, remote_refs
, flags
))
979 if (data
->export_marks
) {
980 strbuf_addf(&buf
, "%s.tmp", data
->export_marks
);
981 rename(buf
.buf
, data
->export_marks
);
982 strbuf_release(&buf
);
988 static int push_refs(struct transport
*transport
,
989 struct ref
*remote_refs
, int flags
)
991 struct helper_data
*data
= transport
->data
;
993 if (process_connect(transport
, 1)) {
994 do_take_over(transport
);
995 return transport
->push_refs(transport
, remote_refs
, flags
);
999 fprintf(stderr
, "No refs in common and none specified; doing nothing.\n"
1000 "Perhaps you should specify a branch such as 'master'.\n");
1005 return push_refs_with_push(transport
, remote_refs
, flags
);
1008 return push_refs_with_export(transport
, remote_refs
, flags
);
1014 static int has_attribute(const char *attrs
, const char *attr
) {
1021 const char *space
= strchrnul(attrs
, ' ');
1022 if (len
== space
- attrs
&& !strncmp(attrs
, attr
, len
))
1030 static struct ref
*get_refs_list(struct transport
*transport
, int for_push
)
1032 struct helper_data
*data
= transport
->data
;
1033 struct child_process
*helper
;
1034 struct ref
*ret
= NULL
;
1035 struct ref
**tail
= &ret
;
1037 struct strbuf buf
= STRBUF_INIT
;
1039 helper
= get_helper(transport
);
1041 if (process_connect(transport
, for_push
)) {
1042 do_take_over(transport
);
1043 return transport
->get_refs_list(transport
, for_push
);
1046 if (data
->push
&& for_push
)
1047 write_str_in_full(helper
->in
, "list for-push\n");
1049 write_str_in_full(helper
->in
, "list\n");
1053 if (recvline(data
, &buf
))
1059 eov
= strchr(buf
.buf
, ' ');
1061 die("Malformed response in ref list: %s", buf
.buf
);
1062 eon
= strchr(eov
+ 1, ' ');
1066 *tail
= alloc_ref(eov
+ 1);
1067 if (buf
.buf
[0] == '@')
1068 (*tail
)->symref
= xstrdup(buf
.buf
+ 1);
1069 else if (buf
.buf
[0] != '?')
1070 get_oid_hex(buf
.buf
, &(*tail
)->old_oid
);
1072 if (has_attribute(eon
+ 1, "unchanged")) {
1073 (*tail
)->status
|= REF_STATUS_UPTODATE
;
1074 if (read_ref((*tail
)->name
,
1075 (*tail
)->old_oid
.hash
) < 0)
1076 die(_("Could not read ref %s"),
1080 tail
= &((*tail
)->next
);
1083 fprintf(stderr
, "Debug: Read ref listing.\n");
1084 strbuf_release(&buf
);
1086 for (posn
= ret
; posn
; posn
= posn
->next
)
1087 resolve_remote_symref(posn
, ret
);
1092 int transport_helper_init(struct transport
*transport
, const char *name
)
1094 struct helper_data
*data
= xcalloc(1, sizeof(*data
));
1097 transport_check_allowed(name
);
1099 if (getenv("GIT_TRANSPORT_HELPER_DEBUG"))
1102 transport
->data
= data
;
1103 transport
->set_option
= set_helper_option
;
1104 transport
->get_refs_list
= get_refs_list
;
1105 transport
->fetch
= fetch
;
1106 transport
->push_refs
= push_refs
;
1107 transport
->disconnect
= release_helper
;
1108 transport
->connect
= connect_helper
;
1109 transport
->smart_options
= &(data
->transport_options
);
1114 * Linux pipes can buffer 65536 bytes at once (and most platforms can
1115 * buffer less), so attempt reads and writes with up to that size.
1117 #define BUFFERSIZE 65536
1118 /* This should be enough to hold debugging message. */
1119 #define PBUFFERSIZE 8192
1121 /* Print bidirectional transfer loop debug message. */
1122 __attribute__((format (printf
, 1, 2)))
1123 static void transfer_debug(const char *fmt
, ...)
1126 char msgbuf
[PBUFFERSIZE
];
1127 static int debug_enabled
= -1;
1129 if (debug_enabled
< 0)
1130 debug_enabled
= getenv("GIT_TRANSLOOP_DEBUG") ? 1 : 0;
1134 va_start(args
, fmt
);
1135 vsnprintf(msgbuf
, PBUFFERSIZE
, fmt
, args
);
1137 fprintf(stderr
, "Transfer loop debugging: %s\n", msgbuf
);
1140 /* Stream state: More data may be coming in this direction. */
1141 #define SSTATE_TRANSFERRING 0
1143 * Stream state: No more data coming in this direction, flushing rest of
1146 #define SSTATE_FLUSHING 1
1147 /* Stream state: Transfer in this direction finished. */
1148 #define SSTATE_FINISHED 2
1150 #define STATE_NEEDS_READING(state) ((state) <= SSTATE_TRANSFERRING)
1151 #define STATE_NEEDS_WRITING(state) ((state) <= SSTATE_FLUSHING)
1152 #define STATE_NEEDS_CLOSING(state) ((state) == SSTATE_FLUSHING)
1154 /* Unidirectional transfer. */
1155 struct unidirectional_transfer
{
1160 /* Is source socket? */
1162 /* Is destination socket? */
1164 /* Transfer state (TRANSFERRING/FLUSHING/FINISHED) */
1167 char buf
[BUFFERSIZE
];
1170 /* Name of source. */
1171 const char *src_name
;
1172 /* Name of destination. */
1173 const char *dest_name
;
1176 /* Closes the target (for writing) if transfer has finished. */
1177 static void udt_close_if_finished(struct unidirectional_transfer
*t
)
1179 if (STATE_NEEDS_CLOSING(t
->state
) && !t
->bufuse
) {
1180 t
->state
= SSTATE_FINISHED
;
1181 if (t
->dest_is_sock
)
1182 shutdown(t
->dest
, SHUT_WR
);
1185 transfer_debug("Closed %s.", t
->dest_name
);
1190 * Tries to read data from source into buffer. If buffer is full,
1191 * no data is read. Returns 0 on success, -1 on error.
1193 static int udt_do_read(struct unidirectional_transfer
*t
)
1197 if (t
->bufuse
== BUFFERSIZE
)
1198 return 0; /* No space for more. */
1200 transfer_debug("%s is readable", t
->src_name
);
1201 bytes
= read(t
->src
, t
->buf
+ t
->bufuse
, BUFFERSIZE
- t
->bufuse
);
1202 if (bytes
< 0 && errno
!= EWOULDBLOCK
&& errno
!= EAGAIN
&&
1204 error_errno("read(%s) failed", t
->src_name
);
1206 } else if (bytes
== 0) {
1207 transfer_debug("%s EOF (with %i bytes in buffer)",
1208 t
->src_name
, (int)t
->bufuse
);
1209 t
->state
= SSTATE_FLUSHING
;
1210 } else if (bytes
> 0) {
1212 transfer_debug("Read %i bytes from %s (buffer now at %i)",
1213 (int)bytes
, t
->src_name
, (int)t
->bufuse
);
1218 /* Tries to write data from buffer into destination. If buffer is empty,
1219 * no data is written. Returns 0 on success, -1 on error.
1221 static int udt_do_write(struct unidirectional_transfer
*t
)
1226 return 0; /* Nothing to write. */
1228 transfer_debug("%s is writable", t
->dest_name
);
1229 bytes
= xwrite(t
->dest
, t
->buf
, t
->bufuse
);
1230 if (bytes
< 0 && errno
!= EWOULDBLOCK
) {
1231 error_errno("write(%s) failed", t
->dest_name
);
1233 } else if (bytes
> 0) {
1236 memmove(t
->buf
, t
->buf
+ bytes
, t
->bufuse
);
1237 transfer_debug("Wrote %i bytes to %s (buffer now at %i)",
1238 (int)bytes
, t
->dest_name
, (int)t
->bufuse
);
1244 /* State of bidirectional transfer loop. */
1245 struct bidirectional_transfer_state
{
1246 /* Direction from program to git. */
1247 struct unidirectional_transfer ptg
;
1248 /* Direction from git to program. */
1249 struct unidirectional_transfer gtp
;
1252 static void *udt_copy_task_routine(void *udt
)
1254 struct unidirectional_transfer
*t
= (struct unidirectional_transfer
*)udt
;
1255 while (t
->state
!= SSTATE_FINISHED
) {
1256 if (STATE_NEEDS_READING(t
->state
))
1259 if (STATE_NEEDS_WRITING(t
->state
))
1260 if (udt_do_write(t
))
1262 if (STATE_NEEDS_CLOSING(t
->state
))
1263 udt_close_if_finished(t
);
1265 return udt
; /* Just some non-NULL value. */
1271 * Join thread, with appropriate errors on failure. Name is name for the
1272 * thread (for error messages). Returns 0 on success, 1 on failure.
1274 static int tloop_join(pthread_t thread
, const char *name
)
1278 err
= pthread_join(thread
, &tret
);
1280 error("%s thread failed", name
);
1284 error("%s thread failed to join: %s", name
, strerror(err
));
1291 * Spawn the transfer tasks and then wait for them. Returns 0 on success,
1294 static int tloop_spawnwait_tasks(struct bidirectional_transfer_state
*s
)
1296 pthread_t gtp_thread
;
1297 pthread_t ptg_thread
;
1300 err
= pthread_create(>p_thread
, NULL
, udt_copy_task_routine
,
1303 die("Can't start thread for copying data: %s", strerror(err
));
1304 err
= pthread_create(&ptg_thread
, NULL
, udt_copy_task_routine
,
1307 die("Can't start thread for copying data: %s", strerror(err
));
1309 ret
|= tloop_join(gtp_thread
, "Git to program copy");
1310 ret
|= tloop_join(ptg_thread
, "Program to git copy");
1315 /* Close the source and target (for writing) for transfer. */
1316 static void udt_kill_transfer(struct unidirectional_transfer
*t
)
1318 t
->state
= SSTATE_FINISHED
;
1320 * Socket read end left open isn't a disaster if nobody
1321 * attempts to read from it (mingw compat headers do not
1324 * We can't fully close the socket since otherwise gtp
1325 * task would first close the socket it sends data to
1326 * while closing the ptg file descriptors.
1328 if (!t
->src_is_sock
)
1330 if (t
->dest_is_sock
)
1331 shutdown(t
->dest
, SHUT_WR
);
1337 * Join process, with appropriate errors on failure. Name is name for the
1338 * process (for error messages). Returns 0 on success, 1 on failure.
1340 static int tloop_join(pid_t pid
, const char *name
)
1343 if (waitpid(pid
, &tret
, 0) < 0) {
1344 error_errno("%s process failed to wait", name
);
1347 if (!WIFEXITED(tret
) || WEXITSTATUS(tret
)) {
1348 error("%s process failed", name
);
1355 * Spawn the transfer tasks and then wait for them. Returns 0 on success,
1358 static int tloop_spawnwait_tasks(struct bidirectional_transfer_state
*s
)
1363 /* Fork thread #1: git to program. */
1366 die_errno("Can't start thread for copying data");
1367 else if (pid1
== 0) {
1368 udt_kill_transfer(&s
->ptg
);
1369 exit(udt_copy_task_routine(&s
->gtp
) ? 0 : 1);
1372 /* Fork thread #2: program to git. */
1375 die_errno("Can't start thread for copying data");
1376 else if (pid2
== 0) {
1377 udt_kill_transfer(&s
->gtp
);
1378 exit(udt_copy_task_routine(&s
->ptg
) ? 0 : 1);
1382 * Close both streams in parent as to not interfere with
1383 * end of file detection and wait for both tasks to finish.
1385 udt_kill_transfer(&s
->gtp
);
1386 udt_kill_transfer(&s
->ptg
);
1387 ret
|= tloop_join(pid1
, "Git to program copy");
1388 ret
|= tloop_join(pid2
, "Program to git copy");
1394 * Copies data from stdin to output and from input to stdout simultaneously.
1395 * Additionally filtering through given filter. If filter is NULL, uses
1398 int bidirectional_transfer_loop(int input
, int output
)
1400 struct bidirectional_transfer_state state
;
1402 /* Fill the state fields. */
1403 state
.ptg
.src
= input
;
1405 state
.ptg
.src_is_sock
= (input
== output
);
1406 state
.ptg
.dest_is_sock
= 0;
1407 state
.ptg
.state
= SSTATE_TRANSFERRING
;
1408 state
.ptg
.bufuse
= 0;
1409 state
.ptg
.src_name
= "remote input";
1410 state
.ptg
.dest_name
= "stdout";
1413 state
.gtp
.dest
= output
;
1414 state
.gtp
.src_is_sock
= 0;
1415 state
.gtp
.dest_is_sock
= (input
== output
);
1416 state
.gtp
.state
= SSTATE_TRANSFERRING
;
1417 state
.gtp
.bufuse
= 0;
1418 state
.gtp
.src_name
= "stdin";
1419 state
.gtp
.dest_name
= "remote output";
1421 return tloop_spawnwait_tasks(&state
);