4 #include "run-command.h"
10 #include "string-list.h"
11 #include "thread-utils.h"
13 #include "argv-array.h"
20 struct child_process
*helper
;
30 check_connectivity
: 1,
31 no_disconnect_req
: 1,
32 no_private_update
: 1;
35 /* These go from remote name (as in "list") to private name */
36 struct refspec
*refspecs
;
38 /* Transport options for fetch-pack/send-pack (should one of
41 struct git_transport_options transport_options
;
44 static void sendline(struct helper_data
*helper
, struct strbuf
*buffer
)
47 fprintf(stderr
, "Debug: Remote helper: -> %s", buffer
->buf
);
48 if (write_in_full(helper
->helper
->in
, buffer
->buf
, buffer
->len
)
50 die_errno("Full write to remote helper failed");
53 static int recvline_fh(FILE *helper
, struct strbuf
*buffer
, const char *name
)
57 fprintf(stderr
, "Debug: Remote helper: Waiting...\n");
58 if (strbuf_getline(buffer
, helper
, '\n') == EOF
) {
60 fprintf(stderr
, "Debug: Remote helper quit.\n");
65 fprintf(stderr
, "Debug: Remote helper: <- %s\n", buffer
->buf
);
69 static int recvline(struct helper_data
*helper
, struct strbuf
*buffer
)
71 return recvline_fh(helper
->out
, buffer
, helper
->name
);
74 static void write_constant(int fd
, const char *str
)
77 fprintf(stderr
, "Debug: Remote helper: -> %s", str
);
78 if (write_in_full(fd
, str
, strlen(str
)) != strlen(str
))
79 die_errno("Full write to remote helper failed");
82 static const char *remove_ext_force(const char *url
)
85 const char *colon
= strchr(url
, ':');
86 if (colon
&& colon
[1] == ':')
92 static void do_take_over(struct transport
*transport
)
94 struct helper_data
*data
;
95 data
= (struct helper_data
*)transport
->data
;
96 transport_take_over(transport
, data
->helper
);
101 static struct child_process
*get_helper(struct transport
*transport
)
103 struct helper_data
*data
= transport
->data
;
104 struct strbuf buf
= STRBUF_INIT
;
105 struct child_process
*helper
;
106 const char **refspecs
= NULL
;
108 int refspec_alloc
= 0;
111 char git_dir_buf
[sizeof(GIT_DIR_ENVIRONMENT
) + PATH_MAX
+ 1];
112 const char *helper_env
[] = {
121 helper
= xcalloc(1, sizeof(*helper
));
125 argv_array_pushf(&helper
->args
, "git-remote-%s", data
->name
);
126 argv_array_push(&helper
->args
, transport
->remote
->name
);
127 argv_array_push(&helper
->args
, remove_ext_force(transport
->url
));
129 helper
->silent_exec_failure
= 1;
131 snprintf(git_dir_buf
, sizeof(git_dir_buf
), "%s=%s", GIT_DIR_ENVIRONMENT
, get_git_dir());
132 helper
->env
= helper_env
;
134 code
= start_command(helper
);
135 if (code
< 0 && errno
== ENOENT
)
136 die("Unable to find remote helper for '%s'", data
->name
);
140 data
->helper
= helper
;
141 data
->no_disconnect_req
= 0;
144 * Open the output as FILE* so strbuf_getline() can be used.
145 * Do this with duped fd because fclose() will close the fd,
146 * and stuff like taking over will require the fd to remain.
148 duped
= dup(helper
->out
);
150 die_errno("Can't dup helper output fd");
151 data
->out
= xfdopen(duped
, "r");
153 write_constant(helper
->in
, "capabilities\n");
158 if (recvline(data
, &buf
))
164 if (*buf
.buf
== '*') {
165 capname
= buf
.buf
+ 1;
171 fprintf(stderr
, "Debug: Got cap %s\n", capname
);
172 if (!strcmp(capname
, "fetch"))
174 else if (!strcmp(capname
, "option"))
176 else if (!strcmp(capname
, "push"))
178 else if (!strcmp(capname
, "import"))
180 else if (!strcmp(capname
, "bidi-import"))
181 data
->bidi_import
= 1;
182 else if (!strcmp(capname
, "export"))
184 else if (!strcmp(capname
, "check-connectivity"))
185 data
->check_connectivity
= 1;
186 else if (!data
->refspecs
&& starts_with(capname
, "refspec ")) {
190 refspecs
[refspec_nr
++] = xstrdup(capname
+ strlen("refspec "));
191 } else if (!strcmp(capname
, "connect")) {
193 } else if (!strcmp(capname
, "signed-tags")) {
194 data
->signed_tags
= 1;
195 } else if (starts_with(capname
, "export-marks ")) {
196 data
->export_marks
= xstrdup(capname
+ strlen("export-marks "));
197 } else if (starts_with(capname
, "import-marks")) {
198 data
->import_marks
= xstrdup(capname
+ strlen("import-marks "));
199 } else if (starts_with(capname
, "no-private-update")) {
200 data
->no_private_update
= 1;
201 } else if (mandatory
) {
202 die("Unknown mandatory capability %s. This remote "
203 "helper probably needs newer version of Git.",
209 data
->refspec_nr
= refspec_nr
;
210 data
->refspecs
= parse_fetch_refspec(refspec_nr
, refspecs
);
211 for (i
= 0; i
< refspec_nr
; i
++)
212 free((char *)refspecs
[i
]);
214 } else if (data
->import
|| data
->bidi_import
|| data
->export
) {
215 warning("This remote helper should implement refspec capability.");
217 strbuf_release(&buf
);
219 fprintf(stderr
, "Debug: Capabilities complete.\n");
223 static int disconnect_helper(struct transport
*transport
)
225 struct helper_data
*data
= transport
->data
;
230 fprintf(stderr
, "Debug: Disconnecting.\n");
231 if (!data
->no_disconnect_req
) {
233 * Ignore write errors; there's nothing we can do,
234 * since we're about to close the pipe anyway. And the
235 * most likely error is EPIPE due to the helper dying
236 * to report an error itself.
238 sigchain_push(SIGPIPE
, SIG_IGN
);
239 xwrite(data
->helper
->in
, "\n", 1);
240 sigchain_pop(SIGPIPE
);
242 close(data
->helper
->in
);
243 close(data
->helper
->out
);
245 res
= finish_command(data
->helper
);
252 static const char *unsupported_options
[] = {
253 TRANS_OPT_UPLOADPACK
,
254 TRANS_OPT_RECEIVEPACK
,
259 static const char *boolean_options
[] = {
265 static int set_helper_option(struct transport
*transport
,
266 const char *name
, const char *value
)
268 struct helper_data
*data
= transport
->data
;
269 struct strbuf buf
= STRBUF_INIT
;
270 int i
, ret
, is_bool
= 0;
272 get_helper(transport
);
277 for (i
= 0; i
< ARRAY_SIZE(unsupported_options
); i
++) {
278 if (!strcmp(name
, unsupported_options
[i
]))
282 for (i
= 0; i
< ARRAY_SIZE(boolean_options
); i
++) {
283 if (!strcmp(name
, boolean_options
[i
])) {
289 strbuf_addf(&buf
, "option %s ", name
);
291 strbuf_addstr(&buf
, value
? "true" : "false");
293 quote_c_style(value
, &buf
, NULL
, 0);
294 strbuf_addch(&buf
, '\n');
296 sendline(data
, &buf
);
297 if (recvline(data
, &buf
))
300 if (!strcmp(buf
.buf
, "ok"))
302 else if (starts_with(buf
.buf
, "error")) {
304 } else if (!strcmp(buf
.buf
, "unsupported"))
307 warning("%s unexpectedly said: '%s'", data
->name
, buf
.buf
);
310 strbuf_release(&buf
);
314 static void standard_options(struct transport
*t
)
320 set_helper_option(t
, "progress", t
->progress
? "true" : "false");
322 n
= snprintf(buf
, sizeof(buf
), "%d", v
+ 1);
323 if (n
>= sizeof(buf
))
324 die("impossibly large verbosity value");
325 set_helper_option(t
, "verbosity", buf
);
328 static int release_helper(struct transport
*transport
)
331 struct helper_data
*data
= transport
->data
;
332 free_refspec(data
->refspec_nr
, data
->refspecs
);
333 data
->refspecs
= NULL
;
334 res
= disconnect_helper(transport
);
335 free(transport
->data
);
339 static int fetch_with_fetch(struct transport
*transport
,
340 int nr_heads
, struct ref
**to_fetch
)
342 struct helper_data
*data
= transport
->data
;
344 struct strbuf buf
= STRBUF_INIT
;
346 standard_options(transport
);
347 if (data
->check_connectivity
&&
348 data
->transport_options
.check_self_contained_and_connected
)
349 set_helper_option(transport
, "check-connectivity", "true");
351 if (transport
->cloning
)
352 set_helper_option(transport
, "cloning", "true");
354 if (data
->transport_options
.update_shallow
)
355 set_helper_option(transport
, "update-shallow", "true");
357 for (i
= 0; i
< nr_heads
; i
++) {
358 const struct ref
*posn
= to_fetch
[i
];
359 if (posn
->status
& REF_STATUS_UPTODATE
)
362 strbuf_addf(&buf
, "fetch %s %s\n",
363 sha1_to_hex(posn
->old_sha1
), posn
->name
);
366 strbuf_addch(&buf
, '\n');
367 sendline(data
, &buf
);
370 if (recvline(data
, &buf
))
373 if (starts_with(buf
.buf
, "lock ")) {
374 const char *name
= buf
.buf
+ 5;
375 if (transport
->pack_lockfile
)
376 warning("%s also locked %s", data
->name
, name
);
378 transport
->pack_lockfile
= xstrdup(name
);
380 else if (data
->check_connectivity
&&
381 data
->transport_options
.check_self_contained_and_connected
&&
382 !strcmp(buf
.buf
, "connectivity-ok"))
383 data
->transport_options
.self_contained_and_connected
= 1;
387 warning("%s unexpectedly said: '%s'", data
->name
, buf
.buf
);
389 strbuf_release(&buf
);
393 static int get_importer(struct transport
*transport
, struct child_process
*fastimport
)
395 struct child_process
*helper
= get_helper(transport
);
396 struct helper_data
*data
= transport
->data
;
397 struct argv_array argv
= ARGV_ARRAY_INIT
;
398 int cat_blob_fd
, code
;
399 memset(fastimport
, 0, sizeof(*fastimport
));
400 fastimport
->in
= helper
->out
;
401 argv_array_push(&argv
, "fast-import");
402 argv_array_push(&argv
, debug
? "--stats" : "--quiet");
404 if (data
->bidi_import
) {
405 cat_blob_fd
= xdup(helper
->in
);
406 argv_array_pushf(&argv
, "--cat-blob-fd=%d", cat_blob_fd
);
408 fastimport
->argv
= argv
.argv
;
409 fastimport
->git_cmd
= 1;
411 code
= start_command(fastimport
);
415 static int get_exporter(struct transport
*transport
,
416 struct child_process
*fastexport
,
417 struct string_list
*revlist_args
)
419 struct helper_data
*data
= transport
->data
;
420 struct child_process
*helper
= get_helper(transport
);
422 struct strbuf tmp
= STRBUF_INIT
;
424 memset(fastexport
, 0, sizeof(*fastexport
));
426 /* we need to duplicate helper->in because we want to use it after
427 * fastexport is done with it. */
428 fastexport
->out
= dup(helper
->in
);
429 fastexport
->argv
= xcalloc(6 + revlist_args
->nr
, sizeof(*fastexport
->argv
));
430 fastexport
->argv
[argc
++] = "fast-export";
431 fastexport
->argv
[argc
++] = "--use-done-feature";
432 fastexport
->argv
[argc
++] = data
->signed_tags
?
433 "--signed-tags=verbatim" : "--signed-tags=warn-strip";
434 if (data
->export_marks
) {
435 strbuf_addf(&tmp
, "--export-marks=%s.tmp", data
->export_marks
);
436 fastexport
->argv
[argc
++] = strbuf_detach(&tmp
, NULL
);
438 if (data
->import_marks
) {
439 strbuf_addf(&tmp
, "--import-marks=%s", data
->import_marks
);
440 fastexport
->argv
[argc
++] = strbuf_detach(&tmp
, NULL
);
443 for (i
= 0; i
< revlist_args
->nr
; i
++)
444 fastexport
->argv
[argc
++] = revlist_args
->items
[i
].string
;
446 fastexport
->git_cmd
= 1;
447 return start_command(fastexport
);
450 static int fetch_with_import(struct transport
*transport
,
451 int nr_heads
, struct ref
**to_fetch
)
453 struct child_process fastimport
;
454 struct helper_data
*data
= transport
->data
;
457 struct strbuf buf
= STRBUF_INIT
;
459 get_helper(transport
);
461 if (get_importer(transport
, &fastimport
))
462 die("Couldn't run fast-import");
464 for (i
= 0; i
< nr_heads
; i
++) {
466 if (posn
->status
& REF_STATUS_UPTODATE
)
469 strbuf_addf(&buf
, "import %s\n", posn
->name
);
470 sendline(data
, &buf
);
474 write_constant(data
->helper
->in
, "\n");
476 * remote-helpers that advertise the bidi-import capability are required to
477 * buffer the complete batch of import commands until this newline before
478 * sending data to fast-import.
479 * These helpers read back data from fast-import on their stdin, which could
480 * be mixed with import commands, otherwise.
483 if (finish_command(&fastimport
))
484 die("Error while running fast-import");
485 argv_array_free_detached(fastimport
.argv
);
488 * The fast-import stream of a remote helper that advertises
489 * the "refspec" capability writes to the refs named after the
490 * right hand side of the first refspec matching each ref we
493 * (If no "refspec" capability was specified, for historical
494 * reasons we default to the equivalent of *:*.)
496 * Store the result in to_fetch[i].old_sha1. Callers such
497 * as "git fetch" can use the value to write feedback to the
498 * terminal, populate FETCH_HEAD, and determine what new value
499 * should be written to peer_ref if the update is a
500 * fast-forward or this is a forced update.
502 for (i
= 0; i
< nr_heads
; i
++) {
505 if (posn
->status
& REF_STATUS_UPTODATE
)
508 private = apply_refspecs(data
->refspecs
, data
->refspec_nr
, posn
->name
);
510 private = xstrdup(posn
->name
);
512 read_ref(private, posn
->old_sha1
);
516 strbuf_release(&buf
);
520 static int process_connect_service(struct transport
*transport
,
521 const char *name
, const char *exec
)
523 struct helper_data
*data
= transport
->data
;
524 struct strbuf cmdbuf
= STRBUF_INIT
;
525 struct child_process
*helper
;
526 int r
, duped
, ret
= 0;
529 helper
= get_helper(transport
);
532 * Yes, dup the pipe another time, as we need unbuffered version
533 * of input pipe as FILE*. fclose() closes the underlying fd and
534 * stream buffering only can be changed before first I/O operation
537 duped
= dup(helper
->out
);
539 die_errno("Can't dup helper output fd");
540 input
= xfdopen(duped
, "r");
541 setvbuf(input
, NULL
, _IONBF
, 0);
544 * Handle --upload-pack and friends. This is fire and forget...
545 * just warn if it fails.
547 if (strcmp(name
, exec
)) {
548 r
= set_helper_option(transport
, "servpath", exec
);
550 warning("Setting remote service path not supported by protocol.");
552 warning("Invalid remote service path.");
556 strbuf_addf(&cmdbuf
, "connect %s\n", name
);
560 sendline(data
, &cmdbuf
);
561 if (recvline_fh(input
, &cmdbuf
, name
))
564 if (!strcmp(cmdbuf
.buf
, "")) {
565 data
->no_disconnect_req
= 1;
567 fprintf(stderr
, "Debug: Smart transport connection "
570 } else if (!strcmp(cmdbuf
.buf
, "fallback")) {
572 fprintf(stderr
, "Debug: Falling back to dumb "
575 die("Unknown response to connect: %s",
583 static int process_connect(struct transport
*transport
,
586 struct helper_data
*data
= transport
->data
;
590 name
= for_push
? "git-receive-pack" : "git-upload-pack";
592 exec
= data
->transport_options
.receivepack
;
594 exec
= data
->transport_options
.uploadpack
;
596 return process_connect_service(transport
, name
, exec
);
599 static int connect_helper(struct transport
*transport
, const char *name
,
600 const char *exec
, int fd
[2])
602 struct helper_data
*data
= transport
->data
;
604 /* Get_helper so connect is inited. */
605 get_helper(transport
);
607 die("Operation not supported by protocol.");
609 if (!process_connect_service(transport
, name
, exec
))
610 die("Can't connect to subservice %s.", name
);
612 fd
[0] = data
->helper
->out
;
613 fd
[1] = data
->helper
->in
;
617 static int fetch(struct transport
*transport
,
618 int nr_heads
, struct ref
**to_fetch
)
620 struct helper_data
*data
= transport
->data
;
623 if (process_connect(transport
, 0)) {
624 do_take_over(transport
);
625 return transport
->fetch(transport
, nr_heads
, to_fetch
);
629 for (i
= 0; i
< nr_heads
; i
++)
630 if (!(to_fetch
[i
]->status
& REF_STATUS_UPTODATE
))
637 return fetch_with_fetch(transport
, nr_heads
, to_fetch
);
640 return fetch_with_import(transport
, nr_heads
, to_fetch
);
645 static int push_update_ref_status(struct strbuf
*buf
,
647 struct ref
*remote_refs
)
650 int status
, forced
= 0;
652 if (starts_with(buf
->buf
, "ok ")) {
653 status
= REF_STATUS_OK
;
654 refname
= buf
->buf
+ 3;
655 } else if (starts_with(buf
->buf
, "error ")) {
656 status
= REF_STATUS_REMOTE_REJECT
;
657 refname
= buf
->buf
+ 6;
659 die("expected ok/error, helper said '%s'", buf
->buf
);
661 msg
= strchr(refname
, ' ');
663 struct strbuf msg_buf
= STRBUF_INIT
;
667 if (!unquote_c_style(&msg_buf
, msg
, &end
))
668 msg
= strbuf_detach(&msg_buf
, NULL
);
671 strbuf_release(&msg_buf
);
673 if (!strcmp(msg
, "no match")) {
674 status
= REF_STATUS_NONE
;
678 else if (!strcmp(msg
, "up to date")) {
679 status
= REF_STATUS_UPTODATE
;
683 else if (!strcmp(msg
, "non-fast forward")) {
684 status
= REF_STATUS_REJECT_NONFASTFORWARD
;
688 else if (!strcmp(msg
, "already exists")) {
689 status
= REF_STATUS_REJECT_ALREADY_EXISTS
;
693 else if (!strcmp(msg
, "fetch first")) {
694 status
= REF_STATUS_REJECT_FETCH_FIRST
;
698 else if (!strcmp(msg
, "needs force")) {
699 status
= REF_STATUS_REJECT_NEEDS_FORCE
;
703 else if (!strcmp(msg
, "stale info")) {
704 status
= REF_STATUS_REJECT_STALE
;
708 else if (!strcmp(msg
, "forced update")) {
716 *ref
= find_ref_by_name(*ref
, refname
);
718 *ref
= find_ref_by_name(remote_refs
, refname
);
720 warning("helper reported unexpected status of %s", refname
);
724 if ((*ref
)->status
!= REF_STATUS_NONE
) {
726 * Earlier, the ref was marked not to be pushed, so ignore the ref
727 * status reported by the remote helper if the latter is 'no match'.
729 if (status
== REF_STATUS_NONE
)
733 (*ref
)->status
= status
;
734 (*ref
)->forced_update
|= forced
;
735 (*ref
)->remote_status
= msg
;
736 return !(status
== REF_STATUS_OK
);
739 static int push_update_refs_status(struct helper_data
*data
,
740 struct ref
*remote_refs
,
743 struct strbuf buf
= STRBUF_INIT
;
744 struct ref
*ref
= remote_refs
;
750 if (recvline(data
, &buf
)) {
758 if (push_update_ref_status(&buf
, &ref
, remote_refs
))
761 if (flags
& TRANSPORT_PUSH_DRY_RUN
|| !data
->refspecs
|| data
->no_private_update
)
764 /* propagate back the update to the remote namespace */
765 private = apply_refspecs(data
->refspecs
, data
->refspec_nr
, ref
->name
);
768 update_ref("update by helper", private, ref
->new_sha1
, NULL
, 0, 0);
771 strbuf_release(&buf
);
775 static int push_refs_with_push(struct transport
*transport
,
776 struct ref
*remote_refs
, int flags
)
778 int force_all
= flags
& TRANSPORT_PUSH_FORCE
;
779 int mirror
= flags
& TRANSPORT_PUSH_MIRROR
;
780 struct helper_data
*data
= transport
->data
;
781 struct strbuf buf
= STRBUF_INIT
;
783 struct string_list cas_options
= STRING_LIST_INIT_DUP
;
784 struct string_list_item
*cas_option
;
786 get_helper(transport
);
790 for (ref
= remote_refs
; ref
; ref
= ref
->next
) {
791 if (!ref
->peer_ref
&& !mirror
)
794 /* Check for statuses set by set_ref_status_for_push() */
795 switch (ref
->status
) {
796 case REF_STATUS_REJECT_NONFASTFORWARD
:
797 case REF_STATUS_REJECT_STALE
:
798 case REF_STATUS_REJECT_ALREADY_EXISTS
:
799 case REF_STATUS_UPTODATE
:
808 strbuf_addstr(&buf
, "push ");
809 if (!ref
->deletion
) {
811 strbuf_addch(&buf
, '+');
813 strbuf_addstr(&buf
, ref
->peer_ref
->name
);
815 strbuf_addstr(&buf
, sha1_to_hex(ref
->new_sha1
));
817 strbuf_addch(&buf
, ':');
818 strbuf_addstr(&buf
, ref
->name
);
819 strbuf_addch(&buf
, '\n');
822 * The "--force-with-lease" options without explicit
823 * values to expect have already been expanded into
824 * the ref->old_sha1_expect[] field; we can ignore
825 * transport->smart_options->cas altogether and instead
826 * can enumerate them from the refs.
828 if (ref
->expect_old_sha1
) {
829 struct strbuf cas
= STRBUF_INIT
;
830 strbuf_addf(&cas
, "%s:%s",
831 ref
->name
, sha1_to_hex(ref
->old_sha1_expect
));
832 string_list_append(&cas_options
, strbuf_detach(&cas
, NULL
));
836 string_list_clear(&cas_options
, 0);
840 standard_options(transport
);
841 for_each_string_list_item(cas_option
, &cas_options
)
842 set_helper_option(transport
, "cas", cas_option
->string
);
844 if (flags
& TRANSPORT_PUSH_DRY_RUN
) {
845 if (set_helper_option(transport
, "dry-run", "true") != 0)
846 die("helper %s does not support dry-run", data
->name
);
849 strbuf_addch(&buf
, '\n');
850 sendline(data
, &buf
);
851 strbuf_release(&buf
);
853 return push_update_refs_status(data
, remote_refs
, flags
);
856 static int push_refs_with_export(struct transport
*transport
,
857 struct ref
*remote_refs
, int flags
)
860 struct child_process
*helper
, exporter
;
861 struct helper_data
*data
= transport
->data
;
862 struct string_list revlist_args
= STRING_LIST_INIT_NODUP
;
863 struct strbuf buf
= STRBUF_INIT
;
866 die("remote-helper doesn't support push; refspec needed");
868 if (flags
& TRANSPORT_PUSH_DRY_RUN
) {
869 if (set_helper_option(transport
, "dry-run", "true") != 0)
870 die("helper %s does not support dry-run", data
->name
);
873 if (flags
& TRANSPORT_PUSH_FORCE
) {
874 if (set_helper_option(transport
, "force", "true") != 0)
875 warning("helper %s does not support 'force'", data
->name
);
878 helper
= get_helper(transport
);
880 write_constant(helper
->in
, "export\n");
884 for (ref
= remote_refs
; ref
; ref
= ref
->next
) {
886 unsigned char sha1
[20];
889 die("remote-helpers do not support ref deletion");
891 private = apply_refspecs(data
->refspecs
, data
->refspec_nr
, ref
->name
);
892 if (private && !get_sha1(private, sha1
)) {
893 strbuf_addf(&buf
, "^%s", private);
894 string_list_append(&revlist_args
, strbuf_detach(&buf
, NULL
));
895 hashcpy(ref
->old_sha1
, sha1
);
900 if (strcmp(ref
->peer_ref
->name
, ref
->name
))
901 die("remote-helpers do not support old:new syntax");
902 string_list_append(&revlist_args
, ref
->peer_ref
->name
);
906 if (get_exporter(transport
, &exporter
, &revlist_args
))
907 die("Couldn't run fast-export");
909 if (finish_command(&exporter
))
910 die("Error while running fast-export");
911 if (push_update_refs_status(data
, remote_refs
, flags
))
914 if (data
->export_marks
) {
915 strbuf_addf(&buf
, "%s.tmp", data
->export_marks
);
916 rename(buf
.buf
, data
->export_marks
);
917 strbuf_release(&buf
);
923 static int push_refs(struct transport
*transport
,
924 struct ref
*remote_refs
, int flags
)
926 struct helper_data
*data
= transport
->data
;
928 if (process_connect(transport
, 1)) {
929 do_take_over(transport
);
930 return transport
->push_refs(transport
, remote_refs
, flags
);
934 fprintf(stderr
, "No refs in common and none specified; doing nothing.\n"
935 "Perhaps you should specify a branch such as 'master'.\n");
940 return push_refs_with_push(transport
, remote_refs
, flags
);
943 return push_refs_with_export(transport
, remote_refs
, flags
);
949 static int has_attribute(const char *attrs
, const char *attr
) {
956 const char *space
= strchrnul(attrs
, ' ');
957 if (len
== space
- attrs
&& !strncmp(attrs
, attr
, len
))
965 static struct ref
*get_refs_list(struct transport
*transport
, int for_push
)
967 struct helper_data
*data
= transport
->data
;
968 struct child_process
*helper
;
969 struct ref
*ret
= NULL
;
970 struct ref
**tail
= &ret
;
972 struct strbuf buf
= STRBUF_INIT
;
974 helper
= get_helper(transport
);
976 if (process_connect(transport
, for_push
)) {
977 do_take_over(transport
);
978 return transport
->get_refs_list(transport
, for_push
);
981 if (data
->push
&& for_push
)
982 write_str_in_full(helper
->in
, "list for-push\n");
984 write_str_in_full(helper
->in
, "list\n");
988 if (recvline(data
, &buf
))
994 eov
= strchr(buf
.buf
, ' ');
996 die("Malformed response in ref list: %s", buf
.buf
);
997 eon
= strchr(eov
+ 1, ' ');
1001 *tail
= alloc_ref(eov
+ 1);
1002 if (buf
.buf
[0] == '@')
1003 (*tail
)->symref
= xstrdup(buf
.buf
+ 1);
1004 else if (buf
.buf
[0] != '?')
1005 get_sha1_hex(buf
.buf
, (*tail
)->old_sha1
);
1007 if (has_attribute(eon
+ 1, "unchanged")) {
1008 (*tail
)->status
|= REF_STATUS_UPTODATE
;
1009 read_ref((*tail
)->name
, (*tail
)->old_sha1
);
1012 tail
= &((*tail
)->next
);
1015 fprintf(stderr
, "Debug: Read ref listing.\n");
1016 strbuf_release(&buf
);
1018 for (posn
= ret
; posn
; posn
= posn
->next
)
1019 resolve_remote_symref(posn
, ret
);
1024 int transport_helper_init(struct transport
*transport
, const char *name
)
1026 struct helper_data
*data
= xcalloc(sizeof(*data
), 1);
1029 if (getenv("GIT_TRANSPORT_HELPER_DEBUG"))
1032 transport
->data
= data
;
1033 transport
->set_option
= set_helper_option
;
1034 transport
->get_refs_list
= get_refs_list
;
1035 transport
->fetch
= fetch
;
1036 transport
->push_refs
= push_refs
;
1037 transport
->disconnect
= release_helper
;
1038 transport
->connect
= connect_helper
;
1039 transport
->smart_options
= &(data
->transport_options
);
1044 * Linux pipes can buffer 65536 bytes at once (and most platforms can
1045 * buffer less), so attempt reads and writes with up to that size.
1047 #define BUFFERSIZE 65536
1048 /* This should be enough to hold debugging message. */
1049 #define PBUFFERSIZE 8192
1051 /* Print bidirectional transfer loop debug message. */
1052 __attribute__((format (printf
, 1, 2)))
1053 static void transfer_debug(const char *fmt
, ...)
1056 char msgbuf
[PBUFFERSIZE
];
1057 static int debug_enabled
= -1;
1059 if (debug_enabled
< 0)
1060 debug_enabled
= getenv("GIT_TRANSLOOP_DEBUG") ? 1 : 0;
1064 va_start(args
, fmt
);
1065 vsnprintf(msgbuf
, PBUFFERSIZE
, fmt
, args
);
1067 fprintf(stderr
, "Transfer loop debugging: %s\n", msgbuf
);
1070 /* Stream state: More data may be coming in this direction. */
1071 #define SSTATE_TRANSFERING 0
1073 * Stream state: No more data coming in this direction, flushing rest of
1076 #define SSTATE_FLUSHING 1
1077 /* Stream state: Transfer in this direction finished. */
1078 #define SSTATE_FINISHED 2
1080 #define STATE_NEEDS_READING(state) ((state) <= SSTATE_TRANSFERING)
1081 #define STATE_NEEDS_WRITING(state) ((state) <= SSTATE_FLUSHING)
1082 #define STATE_NEEDS_CLOSING(state) ((state) == SSTATE_FLUSHING)
1084 /* Unidirectional transfer. */
1085 struct unidirectional_transfer
{
1090 /* Is source socket? */
1092 /* Is destination socket? */
1094 /* Transfer state (TRANSFERRING/FLUSHING/FINISHED) */
1097 char buf
[BUFFERSIZE
];
1100 /* Name of source. */
1101 const char *src_name
;
1102 /* Name of destination. */
1103 const char *dest_name
;
1106 /* Closes the target (for writing) if transfer has finished. */
1107 static void udt_close_if_finished(struct unidirectional_transfer
*t
)
1109 if (STATE_NEEDS_CLOSING(t
->state
) && !t
->bufuse
) {
1110 t
->state
= SSTATE_FINISHED
;
1111 if (t
->dest_is_sock
)
1112 shutdown(t
->dest
, SHUT_WR
);
1115 transfer_debug("Closed %s.", t
->dest_name
);
1120 * Tries to read read data from source into buffer. If buffer is full,
1121 * no data is read. Returns 0 on success, -1 on error.
1123 static int udt_do_read(struct unidirectional_transfer
*t
)
1127 if (t
->bufuse
== BUFFERSIZE
)
1128 return 0; /* No space for more. */
1130 transfer_debug("%s is readable", t
->src_name
);
1131 bytes
= read(t
->src
, t
->buf
+ t
->bufuse
, BUFFERSIZE
- t
->bufuse
);
1132 if (bytes
< 0 && errno
!= EWOULDBLOCK
&& errno
!= EAGAIN
&&
1134 error("read(%s) failed: %s", t
->src_name
, strerror(errno
));
1136 } else if (bytes
== 0) {
1137 transfer_debug("%s EOF (with %i bytes in buffer)",
1138 t
->src_name
, (int)t
->bufuse
);
1139 t
->state
= SSTATE_FLUSHING
;
1140 } else if (bytes
> 0) {
1142 transfer_debug("Read %i bytes from %s (buffer now at %i)",
1143 (int)bytes
, t
->src_name
, (int)t
->bufuse
);
1148 /* Tries to write data from buffer into destination. If buffer is empty,
1149 * no data is written. Returns 0 on success, -1 on error.
1151 static int udt_do_write(struct unidirectional_transfer
*t
)
1156 return 0; /* Nothing to write. */
1158 transfer_debug("%s is writable", t
->dest_name
);
1159 bytes
= xwrite(t
->dest
, t
->buf
, t
->bufuse
);
1160 if (bytes
< 0 && errno
!= EWOULDBLOCK
) {
1161 error("write(%s) failed: %s", t
->dest_name
, strerror(errno
));
1163 } else if (bytes
> 0) {
1166 memmove(t
->buf
, t
->buf
+ bytes
, t
->bufuse
);
1167 transfer_debug("Wrote %i bytes to %s (buffer now at %i)",
1168 (int)bytes
, t
->dest_name
, (int)t
->bufuse
);
1174 /* State of bidirectional transfer loop. */
1175 struct bidirectional_transfer_state
{
1176 /* Direction from program to git. */
1177 struct unidirectional_transfer ptg
;
1178 /* Direction from git to program. */
1179 struct unidirectional_transfer gtp
;
1182 static void *udt_copy_task_routine(void *udt
)
1184 struct unidirectional_transfer
*t
= (struct unidirectional_transfer
*)udt
;
1185 while (t
->state
!= SSTATE_FINISHED
) {
1186 if (STATE_NEEDS_READING(t
->state
))
1189 if (STATE_NEEDS_WRITING(t
->state
))
1190 if (udt_do_write(t
))
1192 if (STATE_NEEDS_CLOSING(t
->state
))
1193 udt_close_if_finished(t
);
1195 return udt
; /* Just some non-NULL value. */
1201 * Join thread, with appropriate errors on failure. Name is name for the
1202 * thread (for error messages). Returns 0 on success, 1 on failure.
1204 static int tloop_join(pthread_t thread
, const char *name
)
1208 err
= pthread_join(thread
, &tret
);
1210 error("%s thread failed", name
);
1214 error("%s thread failed to join: %s", name
, strerror(err
));
1221 * Spawn the transfer tasks and then wait for them. Returns 0 on success,
1224 static int tloop_spawnwait_tasks(struct bidirectional_transfer_state
*s
)
1226 pthread_t gtp_thread
;
1227 pthread_t ptg_thread
;
1230 err
= pthread_create(>p_thread
, NULL
, udt_copy_task_routine
,
1233 die("Can't start thread for copying data: %s", strerror(err
));
1234 err
= pthread_create(&ptg_thread
, NULL
, udt_copy_task_routine
,
1237 die("Can't start thread for copying data: %s", strerror(err
));
1239 ret
|= tloop_join(gtp_thread
, "Git to program copy");
1240 ret
|= tloop_join(ptg_thread
, "Program to git copy");
1245 /* Close the source and target (for writing) for transfer. */
1246 static void udt_kill_transfer(struct unidirectional_transfer
*t
)
1248 t
->state
= SSTATE_FINISHED
;
1250 * Socket read end left open isn't a disaster if nobody
1251 * attempts to read from it (mingw compat headers do not
1254 * We can't fully close the socket since otherwise gtp
1255 * task would first close the socket it sends data to
1256 * while closing the ptg file descriptors.
1258 if (!t
->src_is_sock
)
1260 if (t
->dest_is_sock
)
1261 shutdown(t
->dest
, SHUT_WR
);
1267 * Join process, with appropriate errors on failure. Name is name for the
1268 * process (for error messages). Returns 0 on success, 1 on failure.
1270 static int tloop_join(pid_t pid
, const char *name
)
1273 if (waitpid(pid
, &tret
, 0) < 0) {
1274 error("%s process failed to wait: %s", name
, strerror(errno
));
1277 if (!WIFEXITED(tret
) || WEXITSTATUS(tret
)) {
1278 error("%s process failed", name
);
1285 * Spawn the transfer tasks and then wait for them. Returns 0 on success,
1288 static int tloop_spawnwait_tasks(struct bidirectional_transfer_state
*s
)
1293 /* Fork thread #1: git to program. */
1296 die_errno("Can't start thread for copying data");
1297 else if (pid1
== 0) {
1298 udt_kill_transfer(&s
->ptg
);
1299 exit(udt_copy_task_routine(&s
->gtp
) ? 0 : 1);
1302 /* Fork thread #2: program to git. */
1305 die_errno("Can't start thread for copying data");
1306 else if (pid2
== 0) {
1307 udt_kill_transfer(&s
->gtp
);
1308 exit(udt_copy_task_routine(&s
->ptg
) ? 0 : 1);
1312 * Close both streams in parent as to not interfere with
1313 * end of file detection and wait for both tasks to finish.
1315 udt_kill_transfer(&s
->gtp
);
1316 udt_kill_transfer(&s
->ptg
);
1317 ret
|= tloop_join(pid1
, "Git to program copy");
1318 ret
|= tloop_join(pid2
, "Program to git copy");
1324 * Copies data from stdin to output and from input to stdout simultaneously.
1325 * Additionally filtering through given filter. If filter is NULL, uses
1328 int bidirectional_transfer_loop(int input
, int output
)
1330 struct bidirectional_transfer_state state
;
1332 /* Fill the state fields. */
1333 state
.ptg
.src
= input
;
1335 state
.ptg
.src_is_sock
= (input
== output
);
1336 state
.ptg
.dest_is_sock
= 0;
1337 state
.ptg
.state
= SSTATE_TRANSFERING
;
1338 state
.ptg
.bufuse
= 0;
1339 state
.ptg
.src_name
= "remote input";
1340 state
.ptg
.dest_name
= "stdout";
1343 state
.gtp
.dest
= output
;
1344 state
.gtp
.src_is_sock
= 0;
1345 state
.gtp
.dest_is_sock
= (input
== output
);
1346 state
.gtp
.state
= SSTATE_TRANSFERING
;
1347 state
.gtp
.bufuse
= 0;
1348 state
.gtp
.src_name
= "stdin";
1349 state
.gtp
.dest_name
= "remote output";
1351 return tloop_spawnwait_tasks(&state
);