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;
127 argv_array_pushf(&helper
->env_array
, "%s=%s", GIT_DIR_ENVIRONMENT
,
130 code
= start_command(helper
);
131 if (code
< 0 && errno
== ENOENT
)
132 die("Unable to find remote helper for '%s'", data
->name
);
136 data
->helper
= helper
;
137 data
->no_disconnect_req
= 0;
140 * Open the output as FILE* so strbuf_getline_*() family of
141 * functions can be used.
142 * Do this with duped fd because fclose() will close the fd,
143 * and stuff like taking over will require the fd to remain.
145 duped
= dup(helper
->out
);
147 die_errno("Can't dup helper output fd");
148 data
->out
= xfdopen(duped
, "r");
150 write_constant(helper
->in
, "capabilities\n");
153 const char *capname
, *arg
;
155 if (recvline(data
, &buf
))
161 if (*buf
.buf
== '*') {
162 capname
= buf
.buf
+ 1;
168 fprintf(stderr
, "Debug: Got cap %s\n", capname
);
169 if (!strcmp(capname
, "fetch"))
171 else if (!strcmp(capname
, "option"))
173 else if (!strcmp(capname
, "push"))
175 else if (!strcmp(capname
, "import"))
177 else if (!strcmp(capname
, "bidi-import"))
178 data
->bidi_import
= 1;
179 else if (!strcmp(capname
, "export"))
181 else if (!strcmp(capname
, "check-connectivity"))
182 data
->check_connectivity
= 1;
183 else if (!data
->refspecs
&& skip_prefix(capname
, "refspec ", &arg
)) {
187 refspecs
[refspec_nr
++] = xstrdup(arg
);
188 } else if (!strcmp(capname
, "connect")) {
190 } else if (!strcmp(capname
, "signed-tags")) {
191 data
->signed_tags
= 1;
192 } else if (skip_prefix(capname
, "export-marks ", &arg
)) {
193 data
->export_marks
= xstrdup(arg
);
194 } else if (skip_prefix(capname
, "import-marks ", &arg
)) {
195 data
->import_marks
= xstrdup(arg
);
196 } else if (starts_with(capname
, "no-private-update")) {
197 data
->no_private_update
= 1;
198 } else if (mandatory
) {
199 die("Unknown mandatory capability %s. This remote "
200 "helper probably needs newer version of Git.",
206 data
->refspec_nr
= refspec_nr
;
207 data
->refspecs
= parse_fetch_refspec(refspec_nr
, refspecs
);
208 for (i
= 0; i
< refspec_nr
; i
++)
209 free((char *)refspecs
[i
]);
211 } else if (data
->import
|| data
->bidi_import
|| data
->export
) {
212 warning("This remote helper should implement refspec capability.");
214 strbuf_release(&buf
);
216 fprintf(stderr
, "Debug: Capabilities complete.\n");
217 standard_options(transport
);
221 static int disconnect_helper(struct transport
*transport
)
223 struct helper_data
*data
= transport
->data
;
228 fprintf(stderr
, "Debug: Disconnecting.\n");
229 if (!data
->no_disconnect_req
) {
231 * Ignore write errors; there's nothing we can do,
232 * since we're about to close the pipe anyway. And the
233 * most likely error is EPIPE due to the helper dying
234 * to report an error itself.
236 sigchain_push(SIGPIPE
, SIG_IGN
);
237 xwrite(data
->helper
->in
, "\n", 1);
238 sigchain_pop(SIGPIPE
);
240 close(data
->helper
->in
);
241 close(data
->helper
->out
);
243 res
= finish_command(data
->helper
);
250 static const char *unsupported_options
[] = {
251 TRANS_OPT_UPLOADPACK
,
252 TRANS_OPT_RECEIVEPACK
,
257 static const char *boolean_options
[] = {
260 TRANS_OPT_FOLLOWTAGS
,
261 TRANS_OPT_DEEPEN_RELATIVE
264 static int strbuf_set_helper_option(struct helper_data
*data
,
270 if (recvline(data
, buf
))
273 if (!strcmp(buf
->buf
, "ok"))
275 else if (starts_with(buf
->buf
, "error"))
277 else if (!strcmp(buf
->buf
, "unsupported"))
280 warning("%s unexpectedly said: '%s'", data
->name
, buf
->buf
);
286 static int string_list_set_helper_option(struct helper_data
*data
,
288 struct string_list
*list
)
290 struct strbuf buf
= STRBUF_INIT
;
293 for (i
= 0; i
< list
->nr
; i
++) {
294 strbuf_addf(&buf
, "option %s ", name
);
295 quote_c_style(list
->items
[i
].string
, &buf
, NULL
, 0);
296 strbuf_addch(&buf
, '\n');
298 if ((ret
= strbuf_set_helper_option(data
, &buf
)))
302 strbuf_release(&buf
);
306 static int set_helper_option(struct transport
*transport
,
307 const char *name
, const char *value
)
309 struct helper_data
*data
= transport
->data
;
310 struct strbuf buf
= STRBUF_INIT
;
311 int i
, ret
, is_bool
= 0;
313 get_helper(transport
);
318 if (!strcmp(name
, "deepen-not"))
319 return string_list_set_helper_option(data
, name
,
320 (struct string_list
*)value
);
322 for (i
= 0; i
< ARRAY_SIZE(unsupported_options
); i
++) {
323 if (!strcmp(name
, unsupported_options
[i
]))
327 for (i
= 0; i
< ARRAY_SIZE(boolean_options
); i
++) {
328 if (!strcmp(name
, boolean_options
[i
])) {
334 strbuf_addf(&buf
, "option %s ", name
);
336 strbuf_addstr(&buf
, value
? "true" : "false");
338 quote_c_style(value
, &buf
, NULL
, 0);
339 strbuf_addch(&buf
, '\n');
341 ret
= strbuf_set_helper_option(data
, &buf
);
342 strbuf_release(&buf
);
346 static void standard_options(struct transport
*t
)
352 set_helper_option(t
, "progress", t
->progress
? "true" : "false");
354 n
= snprintf(buf
, sizeof(buf
), "%d", v
+ 1);
355 if (n
>= sizeof(buf
))
356 die("impossibly large verbosity value");
357 set_helper_option(t
, "verbosity", buf
);
360 static int release_helper(struct transport
*transport
)
363 struct helper_data
*data
= transport
->data
;
364 free_refspec(data
->refspec_nr
, data
->refspecs
);
365 data
->refspecs
= NULL
;
366 res
= disconnect_helper(transport
);
367 free(transport
->data
);
371 static int fetch_with_fetch(struct transport
*transport
,
372 int nr_heads
, struct ref
**to_fetch
)
374 struct helper_data
*data
= transport
->data
;
376 struct strbuf buf
= STRBUF_INIT
;
378 for (i
= 0; i
< nr_heads
; i
++) {
379 const struct ref
*posn
= to_fetch
[i
];
380 if (posn
->status
& REF_STATUS_UPTODATE
)
383 strbuf_addf(&buf
, "fetch %s %s\n",
384 oid_to_hex(&posn
->old_oid
),
385 posn
->symref
? posn
->symref
: posn
->name
);
388 strbuf_addch(&buf
, '\n');
389 sendline(data
, &buf
);
392 if (recvline(data
, &buf
))
395 if (starts_with(buf
.buf
, "lock ")) {
396 const char *name
= buf
.buf
+ 5;
397 if (transport
->pack_lockfile
)
398 warning("%s also locked %s", data
->name
, name
);
400 transport
->pack_lockfile
= xstrdup(name
);
402 else if (data
->check_connectivity
&&
403 data
->transport_options
.check_self_contained_and_connected
&&
404 !strcmp(buf
.buf
, "connectivity-ok"))
405 data
->transport_options
.self_contained_and_connected
= 1;
409 warning("%s unexpectedly said: '%s'", data
->name
, buf
.buf
);
411 strbuf_release(&buf
);
415 static int get_importer(struct transport
*transport
, struct child_process
*fastimport
)
417 struct child_process
*helper
= get_helper(transport
);
418 struct helper_data
*data
= transport
->data
;
419 int cat_blob_fd
, code
;
420 child_process_init(fastimport
);
421 fastimport
->in
= helper
->out
;
422 argv_array_push(&fastimport
->args
, "fast-import");
423 argv_array_push(&fastimport
->args
, debug
? "--stats" : "--quiet");
425 if (data
->bidi_import
) {
426 cat_blob_fd
= xdup(helper
->in
);
427 argv_array_pushf(&fastimport
->args
, "--cat-blob-fd=%d", cat_blob_fd
);
429 fastimport
->git_cmd
= 1;
431 code
= start_command(fastimport
);
435 static int get_exporter(struct transport
*transport
,
436 struct child_process
*fastexport
,
437 struct string_list
*revlist_args
)
439 struct helper_data
*data
= transport
->data
;
440 struct child_process
*helper
= get_helper(transport
);
443 child_process_init(fastexport
);
445 /* we need to duplicate helper->in because we want to use it after
446 * fastexport is done with it. */
447 fastexport
->out
= dup(helper
->in
);
448 argv_array_push(&fastexport
->args
, "fast-export");
449 argv_array_push(&fastexport
->args
, "--use-done-feature");
450 argv_array_push(&fastexport
->args
, data
->signed_tags
?
451 "--signed-tags=verbatim" : "--signed-tags=warn-strip");
452 if (data
->export_marks
)
453 argv_array_pushf(&fastexport
->args
, "--export-marks=%s.tmp", data
->export_marks
);
454 if (data
->import_marks
)
455 argv_array_pushf(&fastexport
->args
, "--import-marks=%s", data
->import_marks
);
457 for (i
= 0; i
< revlist_args
->nr
; i
++)
458 argv_array_push(&fastexport
->args
, revlist_args
->items
[i
].string
);
460 fastexport
->git_cmd
= 1;
461 return start_command(fastexport
);
464 static int fetch_with_import(struct transport
*transport
,
465 int nr_heads
, struct ref
**to_fetch
)
467 struct child_process fastimport
;
468 struct helper_data
*data
= transport
->data
;
471 struct strbuf buf
= STRBUF_INIT
;
473 get_helper(transport
);
475 if (get_importer(transport
, &fastimport
))
476 die("Couldn't run fast-import");
478 for (i
= 0; i
< nr_heads
; i
++) {
480 if (posn
->status
& REF_STATUS_UPTODATE
)
483 strbuf_addf(&buf
, "import %s\n",
484 posn
->symref
? posn
->symref
: posn
->name
);
485 sendline(data
, &buf
);
489 write_constant(data
->helper
->in
, "\n");
491 * remote-helpers that advertise the bidi-import capability are required to
492 * buffer the complete batch of import commands until this newline before
493 * sending data to fast-import.
494 * These helpers read back data from fast-import on their stdin, which could
495 * be mixed with import commands, otherwise.
498 if (finish_command(&fastimport
))
499 die("Error while running fast-import");
502 * The fast-import stream of a remote helper that advertises
503 * the "refspec" capability writes to the refs named after the
504 * right hand side of the first refspec matching each ref we
507 * (If no "refspec" capability was specified, for historical
508 * reasons we default to the equivalent of *:*.)
510 * Store the result in to_fetch[i].old_sha1. Callers such
511 * as "git fetch" can use the value to write feedback to the
512 * terminal, populate FETCH_HEAD, and determine what new value
513 * should be written to peer_ref if the update is a
514 * fast-forward or this is a forced update.
516 for (i
= 0; i
< nr_heads
; i
++) {
517 char *private, *name
;
519 if (posn
->status
& REF_STATUS_UPTODATE
)
521 name
= posn
->symref
? posn
->symref
: posn
->name
;
523 private = apply_refspecs(data
->refspecs
, data
->refspec_nr
, name
);
525 private = xstrdup(name
);
527 if (read_ref(private, posn
->old_oid
.hash
) < 0)
528 die("Could not read ref %s", private);
532 strbuf_release(&buf
);
536 static int process_connect_service(struct transport
*transport
,
537 const char *name
, const char *exec
)
539 struct helper_data
*data
= transport
->data
;
540 struct strbuf cmdbuf
= STRBUF_INIT
;
541 struct child_process
*helper
;
542 int r
, duped
, ret
= 0;
545 helper
= get_helper(transport
);
548 * Yes, dup the pipe another time, as we need unbuffered version
549 * of input pipe as FILE*. fclose() closes the underlying fd and
550 * stream buffering only can be changed before first I/O operation
553 duped
= dup(helper
->out
);
555 die_errno("Can't dup helper output fd");
556 input
= xfdopen(duped
, "r");
557 setvbuf(input
, NULL
, _IONBF
, 0);
560 * Handle --upload-pack and friends. This is fire and forget...
561 * just warn if it fails.
563 if (strcmp(name
, exec
)) {
564 r
= set_helper_option(transport
, "servpath", exec
);
566 warning("Setting remote service path not supported by protocol.");
568 warning("Invalid remote service path.");
572 strbuf_addf(&cmdbuf
, "connect %s\n", name
);
576 sendline(data
, &cmdbuf
);
577 if (recvline_fh(input
, &cmdbuf
, name
))
580 if (!strcmp(cmdbuf
.buf
, "")) {
581 data
->no_disconnect_req
= 1;
583 fprintf(stderr
, "Debug: Smart transport connection "
586 } else if (!strcmp(cmdbuf
.buf
, "fallback")) {
588 fprintf(stderr
, "Debug: Falling back to dumb "
591 die("Unknown response to connect: %s",
599 static int process_connect(struct transport
*transport
,
602 struct helper_data
*data
= transport
->data
;
606 name
= for_push
? "git-receive-pack" : "git-upload-pack";
608 exec
= data
->transport_options
.receivepack
;
610 exec
= data
->transport_options
.uploadpack
;
612 return process_connect_service(transport
, name
, exec
);
615 static int connect_helper(struct transport
*transport
, const char *name
,
616 const char *exec
, int fd
[2])
618 struct helper_data
*data
= transport
->data
;
620 /* Get_helper so connect is inited. */
621 get_helper(transport
);
623 die("Operation not supported by protocol.");
625 if (!process_connect_service(transport
, name
, exec
))
626 die("Can't connect to subservice %s.", name
);
628 fd
[0] = data
->helper
->out
;
629 fd
[1] = data
->helper
->in
;
633 static int fetch(struct transport
*transport
,
634 int nr_heads
, struct ref
**to_fetch
)
636 struct helper_data
*data
= transport
->data
;
639 if (process_connect(transport
, 0)) {
640 do_take_over(transport
);
641 return transport
->fetch(transport
, nr_heads
, to_fetch
);
645 for (i
= 0; i
< nr_heads
; i
++)
646 if (!(to_fetch
[i
]->status
& REF_STATUS_UPTODATE
))
652 if (data
->check_connectivity
&&
653 data
->transport_options
.check_self_contained_and_connected
)
654 set_helper_option(transport
, "check-connectivity", "true");
656 if (transport
->cloning
)
657 set_helper_option(transport
, "cloning", "true");
659 if (data
->transport_options
.update_shallow
)
660 set_helper_option(transport
, "update-shallow", "true");
663 return fetch_with_fetch(transport
, nr_heads
, to_fetch
);
666 return fetch_with_import(transport
, nr_heads
, to_fetch
);
671 static int push_update_ref_status(struct strbuf
*buf
,
673 struct ref
*remote_refs
)
676 int status
, forced
= 0;
678 if (starts_with(buf
->buf
, "ok ")) {
679 status
= REF_STATUS_OK
;
680 refname
= buf
->buf
+ 3;
681 } else if (starts_with(buf
->buf
, "error ")) {
682 status
= REF_STATUS_REMOTE_REJECT
;
683 refname
= buf
->buf
+ 6;
685 die("expected ok/error, helper said '%s'", buf
->buf
);
687 msg
= strchr(refname
, ' ');
689 struct strbuf msg_buf
= STRBUF_INIT
;
693 if (!unquote_c_style(&msg_buf
, msg
, &end
))
694 msg
= strbuf_detach(&msg_buf
, NULL
);
697 strbuf_release(&msg_buf
);
699 if (!strcmp(msg
, "no match")) {
700 status
= REF_STATUS_NONE
;
704 else if (!strcmp(msg
, "up to date")) {
705 status
= REF_STATUS_UPTODATE
;
709 else if (!strcmp(msg
, "non-fast forward")) {
710 status
= REF_STATUS_REJECT_NONFASTFORWARD
;
714 else if (!strcmp(msg
, "already exists")) {
715 status
= REF_STATUS_REJECT_ALREADY_EXISTS
;
719 else if (!strcmp(msg
, "fetch first")) {
720 status
= REF_STATUS_REJECT_FETCH_FIRST
;
724 else if (!strcmp(msg
, "needs force")) {
725 status
= REF_STATUS_REJECT_NEEDS_FORCE
;
729 else if (!strcmp(msg
, "stale info")) {
730 status
= REF_STATUS_REJECT_STALE
;
734 else if (!strcmp(msg
, "forced update")) {
742 *ref
= find_ref_by_name(*ref
, refname
);
744 *ref
= find_ref_by_name(remote_refs
, refname
);
746 warning("helper reported unexpected status of %s", refname
);
750 if ((*ref
)->status
!= REF_STATUS_NONE
) {
752 * Earlier, the ref was marked not to be pushed, so ignore the ref
753 * status reported by the remote helper if the latter is 'no match'.
755 if (status
== REF_STATUS_NONE
)
759 (*ref
)->status
= status
;
760 (*ref
)->forced_update
|= forced
;
761 (*ref
)->remote_status
= msg
;
762 return !(status
== REF_STATUS_OK
);
765 static int push_update_refs_status(struct helper_data
*data
,
766 struct ref
*remote_refs
,
769 struct strbuf buf
= STRBUF_INIT
;
770 struct ref
*ref
= remote_refs
;
776 if (recvline(data
, &buf
)) {
784 if (push_update_ref_status(&buf
, &ref
, remote_refs
))
787 if (flags
& TRANSPORT_PUSH_DRY_RUN
|| !data
->refspecs
|| data
->no_private_update
)
790 /* propagate back the update to the remote namespace */
791 private = apply_refspecs(data
->refspecs
, data
->refspec_nr
, ref
->name
);
794 update_ref("update by helper", private, ref
->new_oid
.hash
, NULL
, 0, 0);
797 strbuf_release(&buf
);
801 static void set_common_push_options(struct transport
*transport
,
802 const char *name
, int flags
)
804 if (flags
& TRANSPORT_PUSH_DRY_RUN
) {
805 if (set_helper_option(transport
, "dry-run", "true") != 0)
806 die("helper %s does not support dry-run", name
);
807 } else if (flags
& TRANSPORT_PUSH_CERT_ALWAYS
) {
808 if (set_helper_option(transport
, TRANS_OPT_PUSH_CERT
, "true") != 0)
809 die("helper %s does not support --signed", name
);
810 } else if (flags
& TRANSPORT_PUSH_CERT_IF_ASKED
) {
811 if (set_helper_option(transport
, TRANS_OPT_PUSH_CERT
, "if-asked") != 0)
812 die("helper %s does not support --signed=if-asked", name
);
816 static int push_refs_with_push(struct transport
*transport
,
817 struct ref
*remote_refs
, int flags
)
819 int force_all
= flags
& TRANSPORT_PUSH_FORCE
;
820 int mirror
= flags
& TRANSPORT_PUSH_MIRROR
;
821 struct helper_data
*data
= transport
->data
;
822 struct strbuf buf
= STRBUF_INIT
;
824 struct string_list cas_options
= STRING_LIST_INIT_DUP
;
825 struct string_list_item
*cas_option
;
827 get_helper(transport
);
831 for (ref
= remote_refs
; ref
; ref
= ref
->next
) {
832 if (!ref
->peer_ref
&& !mirror
)
835 /* Check for statuses set by set_ref_status_for_push() */
836 switch (ref
->status
) {
837 case REF_STATUS_REJECT_NONFASTFORWARD
:
838 case REF_STATUS_REJECT_STALE
:
839 case REF_STATUS_REJECT_ALREADY_EXISTS
:
840 case REF_STATUS_UPTODATE
:
849 strbuf_addstr(&buf
, "push ");
850 if (!ref
->deletion
) {
852 strbuf_addch(&buf
, '+');
854 strbuf_addstr(&buf
, ref
->peer_ref
->name
);
856 strbuf_addstr(&buf
, oid_to_hex(&ref
->new_oid
));
858 strbuf_addch(&buf
, ':');
859 strbuf_addstr(&buf
, ref
->name
);
860 strbuf_addch(&buf
, '\n');
863 * The "--force-with-lease" options without explicit
864 * values to expect have already been expanded into
865 * the ref->old_oid_expect[] field; we can ignore
866 * transport->smart_options->cas altogether and instead
867 * can enumerate them from the refs.
869 if (ref
->expect_old_sha1
) {
870 struct strbuf cas
= STRBUF_INIT
;
871 strbuf_addf(&cas
, "%s:%s",
872 ref
->name
, oid_to_hex(&ref
->old_oid_expect
));
873 string_list_append(&cas_options
, strbuf_detach(&cas
, NULL
));
877 string_list_clear(&cas_options
, 0);
881 for_each_string_list_item(cas_option
, &cas_options
)
882 set_helper_option(transport
, "cas", cas_option
->string
);
883 set_common_push_options(transport
, data
->name
, flags
);
885 strbuf_addch(&buf
, '\n');
886 sendline(data
, &buf
);
887 strbuf_release(&buf
);
889 return push_update_refs_status(data
, remote_refs
, flags
);
892 static int push_refs_with_export(struct transport
*transport
,
893 struct ref
*remote_refs
, int flags
)
896 struct child_process
*helper
, exporter
;
897 struct helper_data
*data
= transport
->data
;
898 struct string_list revlist_args
= STRING_LIST_INIT_DUP
;
899 struct strbuf buf
= STRBUF_INIT
;
902 die("remote-helper doesn't support push; refspec needed");
904 set_common_push_options(transport
, data
->name
, flags
);
905 if (flags
& TRANSPORT_PUSH_FORCE
) {
906 if (set_helper_option(transport
, "force", "true") != 0)
907 warning("helper %s does not support 'force'", data
->name
);
910 helper
= get_helper(transport
);
912 write_constant(helper
->in
, "export\n");
914 for (ref
= remote_refs
; ref
; ref
= ref
->next
) {
916 struct object_id oid
;
918 private = apply_refspecs(data
->refspecs
, data
->refspec_nr
, ref
->name
);
919 if (private && !get_sha1(private, oid
.hash
)) {
920 strbuf_addf(&buf
, "^%s", private);
921 string_list_append(&revlist_args
, strbuf_detach(&buf
, NULL
));
922 oidcpy(&ref
->old_oid
, &oid
);
927 if (strcmp(ref
->name
, ref
->peer_ref
->name
)) {
928 if (!ref
->deletion
) {
932 /* Follow symbolic refs (mainly for HEAD). */
933 name
= resolve_ref_unsafe(
937 if (!name
|| !(flag
& REF_ISSYMREF
))
938 name
= ref
->peer_ref
->name
;
940 strbuf_addf(&buf
, "%s:%s", name
, ref
->name
);
942 strbuf_addf(&buf
, ":%s", ref
->name
);
944 string_list_append(&revlist_args
, "--refspec");
945 string_list_append(&revlist_args
, buf
.buf
);
946 strbuf_release(&buf
);
949 string_list_append(&revlist_args
, ref
->peer_ref
->name
);
953 if (get_exporter(transport
, &exporter
, &revlist_args
))
954 die("Couldn't run fast-export");
956 string_list_clear(&revlist_args
, 1);
958 if (finish_command(&exporter
))
959 die("Error while running fast-export");
960 if (push_update_refs_status(data
, remote_refs
, flags
))
963 if (data
->export_marks
) {
964 strbuf_addf(&buf
, "%s.tmp", data
->export_marks
);
965 rename(buf
.buf
, data
->export_marks
);
966 strbuf_release(&buf
);
972 static int push_refs(struct transport
*transport
,
973 struct ref
*remote_refs
, int flags
)
975 struct helper_data
*data
= transport
->data
;
977 if (process_connect(transport
, 1)) {
978 do_take_over(transport
);
979 return transport
->push_refs(transport
, remote_refs
, flags
);
983 fprintf(stderr
, "No refs in common and none specified; doing nothing.\n"
984 "Perhaps you should specify a branch such as 'master'.\n");
989 return push_refs_with_push(transport
, remote_refs
, flags
);
992 return push_refs_with_export(transport
, remote_refs
, flags
);
998 static int has_attribute(const char *attrs
, const char *attr
) {
1005 const char *space
= strchrnul(attrs
, ' ');
1006 if (len
== space
- attrs
&& !strncmp(attrs
, attr
, len
))
1014 static struct ref
*get_refs_list(struct transport
*transport
, int for_push
)
1016 struct helper_data
*data
= transport
->data
;
1017 struct child_process
*helper
;
1018 struct ref
*ret
= NULL
;
1019 struct ref
**tail
= &ret
;
1021 struct strbuf buf
= STRBUF_INIT
;
1023 helper
= get_helper(transport
);
1025 if (process_connect(transport
, for_push
)) {
1026 do_take_over(transport
);
1027 return transport
->get_refs_list(transport
, for_push
);
1030 if (data
->push
&& for_push
)
1031 write_str_in_full(helper
->in
, "list for-push\n");
1033 write_str_in_full(helper
->in
, "list\n");
1037 if (recvline(data
, &buf
))
1043 eov
= strchr(buf
.buf
, ' ');
1045 die("Malformed response in ref list: %s", buf
.buf
);
1046 eon
= strchr(eov
+ 1, ' ');
1050 *tail
= alloc_ref(eov
+ 1);
1051 if (buf
.buf
[0] == '@')
1052 (*tail
)->symref
= xstrdup(buf
.buf
+ 1);
1053 else if (buf
.buf
[0] != '?')
1054 get_oid_hex(buf
.buf
, &(*tail
)->old_oid
);
1056 if (has_attribute(eon
+ 1, "unchanged")) {
1057 (*tail
)->status
|= REF_STATUS_UPTODATE
;
1058 if (read_ref((*tail
)->name
,
1059 (*tail
)->old_oid
.hash
) < 0)
1060 die(N_("Could not read ref %s"),
1064 tail
= &((*tail
)->next
);
1067 fprintf(stderr
, "Debug: Read ref listing.\n");
1068 strbuf_release(&buf
);
1070 for (posn
= ret
; posn
; posn
= posn
->next
)
1071 resolve_remote_symref(posn
, ret
);
1076 int transport_helper_init(struct transport
*transport
, const char *name
)
1078 struct helper_data
*data
= xcalloc(1, sizeof(*data
));
1081 transport_check_allowed(name
);
1083 if (getenv("GIT_TRANSPORT_HELPER_DEBUG"))
1086 transport
->data
= data
;
1087 transport
->set_option
= set_helper_option
;
1088 transport
->get_refs_list
= get_refs_list
;
1089 transport
->fetch
= fetch
;
1090 transport
->push_refs
= push_refs
;
1091 transport
->disconnect
= release_helper
;
1092 transport
->connect
= connect_helper
;
1093 transport
->smart_options
= &(data
->transport_options
);
1098 * Linux pipes can buffer 65536 bytes at once (and most platforms can
1099 * buffer less), so attempt reads and writes with up to that size.
1101 #define BUFFERSIZE 65536
1102 /* This should be enough to hold debugging message. */
1103 #define PBUFFERSIZE 8192
1105 /* Print bidirectional transfer loop debug message. */
1106 __attribute__((format (printf
, 1, 2)))
1107 static void transfer_debug(const char *fmt
, ...)
1110 char msgbuf
[PBUFFERSIZE
];
1111 static int debug_enabled
= -1;
1113 if (debug_enabled
< 0)
1114 debug_enabled
= getenv("GIT_TRANSLOOP_DEBUG") ? 1 : 0;
1118 va_start(args
, fmt
);
1119 vsnprintf(msgbuf
, PBUFFERSIZE
, fmt
, args
);
1121 fprintf(stderr
, "Transfer loop debugging: %s\n", msgbuf
);
1124 /* Stream state: More data may be coming in this direction. */
1125 #define SSTATE_TRANSFERING 0
1127 * Stream state: No more data coming in this direction, flushing rest of
1130 #define SSTATE_FLUSHING 1
1131 /* Stream state: Transfer in this direction finished. */
1132 #define SSTATE_FINISHED 2
1134 #define STATE_NEEDS_READING(state) ((state) <= SSTATE_TRANSFERING)
1135 #define STATE_NEEDS_WRITING(state) ((state) <= SSTATE_FLUSHING)
1136 #define STATE_NEEDS_CLOSING(state) ((state) == SSTATE_FLUSHING)
1138 /* Unidirectional transfer. */
1139 struct unidirectional_transfer
{
1144 /* Is source socket? */
1146 /* Is destination socket? */
1148 /* Transfer state (TRANSFERRING/FLUSHING/FINISHED) */
1151 char buf
[BUFFERSIZE
];
1154 /* Name of source. */
1155 const char *src_name
;
1156 /* Name of destination. */
1157 const char *dest_name
;
1160 /* Closes the target (for writing) if transfer has finished. */
1161 static void udt_close_if_finished(struct unidirectional_transfer
*t
)
1163 if (STATE_NEEDS_CLOSING(t
->state
) && !t
->bufuse
) {
1164 t
->state
= SSTATE_FINISHED
;
1165 if (t
->dest_is_sock
)
1166 shutdown(t
->dest
, SHUT_WR
);
1169 transfer_debug("Closed %s.", t
->dest_name
);
1174 * Tries to read read data from source into buffer. If buffer is full,
1175 * no data is read. Returns 0 on success, -1 on error.
1177 static int udt_do_read(struct unidirectional_transfer
*t
)
1181 if (t
->bufuse
== BUFFERSIZE
)
1182 return 0; /* No space for more. */
1184 transfer_debug("%s is readable", t
->src_name
);
1185 bytes
= read(t
->src
, t
->buf
+ t
->bufuse
, BUFFERSIZE
- t
->bufuse
);
1186 if (bytes
< 0 && errno
!= EWOULDBLOCK
&& errno
!= EAGAIN
&&
1188 error("read(%s) failed: %s", t
->src_name
, strerror(errno
));
1190 } else if (bytes
== 0) {
1191 transfer_debug("%s EOF (with %i bytes in buffer)",
1192 t
->src_name
, (int)t
->bufuse
);
1193 t
->state
= SSTATE_FLUSHING
;
1194 } else if (bytes
> 0) {
1196 transfer_debug("Read %i bytes from %s (buffer now at %i)",
1197 (int)bytes
, t
->src_name
, (int)t
->bufuse
);
1202 /* Tries to write data from buffer into destination. If buffer is empty,
1203 * no data is written. Returns 0 on success, -1 on error.
1205 static int udt_do_write(struct unidirectional_transfer
*t
)
1210 return 0; /* Nothing to write. */
1212 transfer_debug("%s is writable", t
->dest_name
);
1213 bytes
= xwrite(t
->dest
, t
->buf
, t
->bufuse
);
1214 if (bytes
< 0 && errno
!= EWOULDBLOCK
) {
1215 error("write(%s) failed: %s", t
->dest_name
, strerror(errno
));
1217 } else if (bytes
> 0) {
1220 memmove(t
->buf
, t
->buf
+ bytes
, t
->bufuse
);
1221 transfer_debug("Wrote %i bytes to %s (buffer now at %i)",
1222 (int)bytes
, t
->dest_name
, (int)t
->bufuse
);
1228 /* State of bidirectional transfer loop. */
1229 struct bidirectional_transfer_state
{
1230 /* Direction from program to git. */
1231 struct unidirectional_transfer ptg
;
1232 /* Direction from git to program. */
1233 struct unidirectional_transfer gtp
;
1236 static void *udt_copy_task_routine(void *udt
)
1238 struct unidirectional_transfer
*t
= (struct unidirectional_transfer
*)udt
;
1239 while (t
->state
!= SSTATE_FINISHED
) {
1240 if (STATE_NEEDS_READING(t
->state
))
1243 if (STATE_NEEDS_WRITING(t
->state
))
1244 if (udt_do_write(t
))
1246 if (STATE_NEEDS_CLOSING(t
->state
))
1247 udt_close_if_finished(t
);
1249 return udt
; /* Just some non-NULL value. */
1255 * Join thread, with appropriate errors on failure. Name is name for the
1256 * thread (for error messages). Returns 0 on success, 1 on failure.
1258 static int tloop_join(pthread_t thread
, const char *name
)
1262 err
= pthread_join(thread
, &tret
);
1264 error("%s thread failed", name
);
1268 error("%s thread failed to join: %s", name
, strerror(err
));
1275 * Spawn the transfer tasks and then wait for them. Returns 0 on success,
1278 static int tloop_spawnwait_tasks(struct bidirectional_transfer_state
*s
)
1280 pthread_t gtp_thread
;
1281 pthread_t ptg_thread
;
1284 err
= pthread_create(>p_thread
, NULL
, udt_copy_task_routine
,
1287 die("Can't start thread for copying data: %s", strerror(err
));
1288 err
= pthread_create(&ptg_thread
, NULL
, udt_copy_task_routine
,
1291 die("Can't start thread for copying data: %s", strerror(err
));
1293 ret
|= tloop_join(gtp_thread
, "Git to program copy");
1294 ret
|= tloop_join(ptg_thread
, "Program to git copy");
1299 /* Close the source and target (for writing) for transfer. */
1300 static void udt_kill_transfer(struct unidirectional_transfer
*t
)
1302 t
->state
= SSTATE_FINISHED
;
1304 * Socket read end left open isn't a disaster if nobody
1305 * attempts to read from it (mingw compat headers do not
1308 * We can't fully close the socket since otherwise gtp
1309 * task would first close the socket it sends data to
1310 * while closing the ptg file descriptors.
1312 if (!t
->src_is_sock
)
1314 if (t
->dest_is_sock
)
1315 shutdown(t
->dest
, SHUT_WR
);
1321 * Join process, with appropriate errors on failure. Name is name for the
1322 * process (for error messages). Returns 0 on success, 1 on failure.
1324 static int tloop_join(pid_t pid
, const char *name
)
1327 if (waitpid(pid
, &tret
, 0) < 0) {
1328 error("%s process failed to wait: %s", name
, strerror(errno
));
1331 if (!WIFEXITED(tret
) || WEXITSTATUS(tret
)) {
1332 error("%s process failed", name
);
1339 * Spawn the transfer tasks and then wait for them. Returns 0 on success,
1342 static int tloop_spawnwait_tasks(struct bidirectional_transfer_state
*s
)
1347 /* Fork thread #1: git to program. */
1350 die_errno("Can't start thread for copying data");
1351 else if (pid1
== 0) {
1352 udt_kill_transfer(&s
->ptg
);
1353 exit(udt_copy_task_routine(&s
->gtp
) ? 0 : 1);
1356 /* Fork thread #2: program to git. */
1359 die_errno("Can't start thread for copying data");
1360 else if (pid2
== 0) {
1361 udt_kill_transfer(&s
->gtp
);
1362 exit(udt_copy_task_routine(&s
->ptg
) ? 0 : 1);
1366 * Close both streams in parent as to not interfere with
1367 * end of file detection and wait for both tasks to finish.
1369 udt_kill_transfer(&s
->gtp
);
1370 udt_kill_transfer(&s
->ptg
);
1371 ret
|= tloop_join(pid1
, "Git to program copy");
1372 ret
|= tloop_join(pid2
, "Program to git copy");
1378 * Copies data from stdin to output and from input to stdout simultaneously.
1379 * Additionally filtering through given filter. If filter is NULL, uses
1382 int bidirectional_transfer_loop(int input
, int output
)
1384 struct bidirectional_transfer_state state
;
1386 /* Fill the state fields. */
1387 state
.ptg
.src
= input
;
1389 state
.ptg
.src_is_sock
= (input
== output
);
1390 state
.ptg
.dest_is_sock
= 0;
1391 state
.ptg
.state
= SSTATE_TRANSFERING
;
1392 state
.ptg
.bufuse
= 0;
1393 state
.ptg
.src_name
= "remote input";
1394 state
.ptg
.dest_name
= "stdout";
1397 state
.gtp
.dest
= output
;
1398 state
.gtp
.src_is_sock
= 0;
1399 state
.gtp
.dest_is_sock
= (input
== output
);
1400 state
.gtp
.state
= SSTATE_TRANSFERING
;
1401 state
.gtp
.bufuse
= 0;
1402 state
.gtp
.src_name
= "stdin";
1403 state
.gtp
.dest_name
= "remote output";
1405 return tloop_spawnwait_tasks(&state
);