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 argv_array argv
= ARGV_ARRAY_INIT
;
105 struct strbuf buf
= STRBUF_INIT
;
106 struct child_process
*helper
;
107 const char **refspecs
= NULL
;
109 int refspec_alloc
= 0;
112 char git_dir_buf
[sizeof(GIT_DIR_ENVIRONMENT
) + PATH_MAX
+ 1];
113 const char *helper_env
[] = {
122 helper
= xcalloc(1, sizeof(*helper
));
126 argv_array_pushf(&argv
, "git-remote-%s", data
->name
);
127 argv_array_push(&argv
, transport
->remote
->name
);
128 argv_array_push(&argv
, remove_ext_force(transport
->url
));
129 helper
->argv
= argv_array_detach(&argv
, NULL
);
131 helper
->silent_exec_failure
= 1;
133 snprintf(git_dir_buf
, sizeof(git_dir_buf
), "%s=%s", GIT_DIR_ENVIRONMENT
, get_git_dir());
134 helper
->env
= helper_env
;
136 code
= start_command(helper
);
137 if (code
< 0 && errno
== ENOENT
)
138 die("Unable to find remote helper for '%s'", data
->name
);
142 data
->helper
= helper
;
143 data
->no_disconnect_req
= 0;
146 * Open the output as FILE* so strbuf_getline() can be used.
147 * Do this with duped fd because fclose() will close the fd,
148 * and stuff like taking over will require the fd to remain.
150 duped
= dup(helper
->out
);
152 die_errno("Can't dup helper output fd");
153 data
->out
= xfdopen(duped
, "r");
155 write_constant(helper
->in
, "capabilities\n");
160 recvline(data
, &buf
);
165 if (*buf
.buf
== '*') {
166 capname
= buf
.buf
+ 1;
172 fprintf(stderr
, "Debug: Got cap %s\n", capname
);
173 if (!strcmp(capname
, "fetch"))
175 else if (!strcmp(capname
, "option"))
177 else if (!strcmp(capname
, "push"))
179 else if (!strcmp(capname
, "import"))
181 else if (!strcmp(capname
, "bidi-import"))
182 data
->bidi_import
= 1;
183 else if (!strcmp(capname
, "export"))
185 else if (!strcmp(capname
, "check-connectivity"))
186 data
->check_connectivity
= 1;
187 else if (!data
->refspecs
&& starts_with(capname
, "refspec ")) {
191 refspecs
[refspec_nr
++] = xstrdup(capname
+ strlen("refspec "));
192 } else if (!strcmp(capname
, "connect")) {
194 } else if (!strcmp(capname
, "signed-tags")) {
195 data
->signed_tags
= 1;
196 } else if (starts_with(capname
, "export-marks ")) {
197 struct strbuf arg
= STRBUF_INIT
;
198 strbuf_addstr(&arg
, "--export-marks=");
199 strbuf_addstr(&arg
, capname
+ strlen("export-marks "));
200 data
->export_marks
= strbuf_detach(&arg
, NULL
);
201 } else if (starts_with(capname
, "import-marks")) {
202 struct strbuf arg
= STRBUF_INIT
;
203 strbuf_addstr(&arg
, "--import-marks=");
204 strbuf_addstr(&arg
, capname
+ strlen("import-marks "));
205 data
->import_marks
= strbuf_detach(&arg
, NULL
);
206 } else if (starts_with(capname
, "no-private-update")) {
207 data
->no_private_update
= 1;
208 } else if (mandatory
) {
209 die("Unknown mandatory capability %s. This remote "
210 "helper probably needs newer version of Git.",
216 data
->refspec_nr
= refspec_nr
;
217 data
->refspecs
= parse_fetch_refspec(refspec_nr
, refspecs
);
218 for (i
= 0; i
< refspec_nr
; i
++)
219 free((char *)refspecs
[i
]);
221 } else if (data
->import
|| data
->bidi_import
|| data
->export
) {
222 warning("This remote helper should implement refspec capability.");
224 strbuf_release(&buf
);
226 fprintf(stderr
, "Debug: Capabilities complete.\n");
230 static int disconnect_helper(struct transport
*transport
)
232 struct helper_data
*data
= transport
->data
;
237 fprintf(stderr
, "Debug: Disconnecting.\n");
238 if (!data
->no_disconnect_req
) {
240 * Ignore write errors; there's nothing we can do,
241 * since we're about to close the pipe anyway. And the
242 * most likely error is EPIPE due to the helper dying
243 * to report an error itself.
245 sigchain_push(SIGPIPE
, SIG_IGN
);
246 xwrite(data
->helper
->in
, "\n", 1);
247 sigchain_pop(SIGPIPE
);
249 close(data
->helper
->in
);
250 close(data
->helper
->out
);
252 res
= finish_command(data
->helper
);
253 argv_array_free_detached(data
->helper
->argv
);
260 static const char *unsupported_options
[] = {
261 TRANS_OPT_UPLOADPACK
,
262 TRANS_OPT_RECEIVEPACK
,
267 static const char *boolean_options
[] = {
273 static int set_helper_option(struct transport
*transport
,
274 const char *name
, const char *value
)
276 struct helper_data
*data
= transport
->data
;
277 struct strbuf buf
= STRBUF_INIT
;
278 int i
, ret
, is_bool
= 0;
280 get_helper(transport
);
285 for (i
= 0; i
< ARRAY_SIZE(unsupported_options
); i
++) {
286 if (!strcmp(name
, unsupported_options
[i
]))
290 for (i
= 0; i
< ARRAY_SIZE(boolean_options
); i
++) {
291 if (!strcmp(name
, boolean_options
[i
])) {
297 strbuf_addf(&buf
, "option %s ", name
);
299 strbuf_addstr(&buf
, value
? "true" : "false");
301 quote_c_style(value
, &buf
, NULL
, 0);
302 strbuf_addch(&buf
, '\n');
304 sendline(data
, &buf
);
305 recvline(data
, &buf
);
307 if (!strcmp(buf
.buf
, "ok"))
309 else if (starts_with(buf
.buf
, "error")) {
311 } else if (!strcmp(buf
.buf
, "unsupported"))
314 warning("%s unexpectedly said: '%s'", data
->name
, buf
.buf
);
317 strbuf_release(&buf
);
321 static void standard_options(struct transport
*t
)
327 set_helper_option(t
, "progress", t
->progress
? "true" : "false");
329 n
= snprintf(buf
, sizeof(buf
), "%d", v
+ 1);
330 if (n
>= sizeof(buf
))
331 die("impossibly large verbosity value");
332 set_helper_option(t
, "verbosity", buf
);
335 static int release_helper(struct transport
*transport
)
338 struct helper_data
*data
= transport
->data
;
339 free_refspec(data
->refspec_nr
, data
->refspecs
);
340 data
->refspecs
= NULL
;
341 res
= disconnect_helper(transport
);
342 free(transport
->data
);
346 static int fetch_with_fetch(struct transport
*transport
,
347 int nr_heads
, struct ref
**to_fetch
)
349 struct helper_data
*data
= transport
->data
;
351 struct strbuf buf
= STRBUF_INIT
;
353 standard_options(transport
);
354 if (data
->check_connectivity
&&
355 data
->transport_options
.check_self_contained_and_connected
)
356 set_helper_option(transport
, "check-connectivity", "true");
358 if (transport
->cloning
)
359 set_helper_option(transport
, "cloning", "true");
361 if (data
->transport_options
.update_shallow
)
362 set_helper_option(transport
, "update-shallow", "true");
364 for (i
= 0; i
< nr_heads
; i
++) {
365 const struct ref
*posn
= to_fetch
[i
];
366 if (posn
->status
& REF_STATUS_UPTODATE
)
369 strbuf_addf(&buf
, "fetch %s %s\n",
370 sha1_to_hex(posn
->old_sha1
), posn
->name
);
373 strbuf_addch(&buf
, '\n');
374 sendline(data
, &buf
);
377 recvline(data
, &buf
);
379 if (starts_with(buf
.buf
, "lock ")) {
380 const char *name
= buf
.buf
+ 5;
381 if (transport
->pack_lockfile
)
382 warning("%s also locked %s", data
->name
, name
);
384 transport
->pack_lockfile
= xstrdup(name
);
386 else if (data
->check_connectivity
&&
387 data
->transport_options
.check_self_contained_and_connected
&&
388 !strcmp(buf
.buf
, "connectivity-ok"))
389 data
->transport_options
.self_contained_and_connected
= 1;
393 warning("%s unexpectedly said: '%s'", data
->name
, buf
.buf
);
395 strbuf_release(&buf
);
399 static int get_importer(struct transport
*transport
, struct child_process
*fastimport
)
401 struct child_process
*helper
= get_helper(transport
);
402 struct helper_data
*data
= transport
->data
;
403 struct argv_array argv
= ARGV_ARRAY_INIT
;
404 int cat_blob_fd
, code
;
405 memset(fastimport
, 0, sizeof(*fastimport
));
406 fastimport
->in
= helper
->out
;
407 argv_array_push(&argv
, "fast-import");
408 argv_array_push(&argv
, debug
? "--stats" : "--quiet");
410 if (data
->bidi_import
) {
411 cat_blob_fd
= xdup(helper
->in
);
412 argv_array_pushf(&argv
, "--cat-blob-fd=%d", cat_blob_fd
);
414 fastimport
->argv
= argv
.argv
;
415 fastimport
->git_cmd
= 1;
417 code
= start_command(fastimport
);
421 static int get_exporter(struct transport
*transport
,
422 struct child_process
*fastexport
,
423 struct string_list
*revlist_args
)
425 struct helper_data
*data
= transport
->data
;
426 struct child_process
*helper
= get_helper(transport
);
428 memset(fastexport
, 0, sizeof(*fastexport
));
430 /* we need to duplicate helper->in because we want to use it after
431 * fastexport is done with it. */
432 fastexport
->out
= dup(helper
->in
);
433 fastexport
->argv
= xcalloc(6 + revlist_args
->nr
, sizeof(*fastexport
->argv
));
434 fastexport
->argv
[argc
++] = "fast-export";
435 fastexport
->argv
[argc
++] = "--use-done-feature";
436 fastexport
->argv
[argc
++] = data
->signed_tags
?
437 "--signed-tags=verbatim" : "--signed-tags=warn-strip";
438 if (data
->export_marks
)
439 fastexport
->argv
[argc
++] = data
->export_marks
;
440 if (data
->import_marks
)
441 fastexport
->argv
[argc
++] = data
->import_marks
;
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 recvline_fh(input
, &cmdbuf
, name
);
562 if (!strcmp(cmdbuf
.buf
, "")) {
563 data
->no_disconnect_req
= 1;
565 fprintf(stderr
, "Debug: Smart transport connection "
568 } else if (!strcmp(cmdbuf
.buf
, "fallback")) {
570 fprintf(stderr
, "Debug: Falling back to dumb "
573 die("Unknown response to connect: %s",
581 static int process_connect(struct transport
*transport
,
584 struct helper_data
*data
= transport
->data
;
588 name
= for_push
? "git-receive-pack" : "git-upload-pack";
590 exec
= data
->transport_options
.receivepack
;
592 exec
= data
->transport_options
.uploadpack
;
594 return process_connect_service(transport
, name
, exec
);
597 static int connect_helper(struct transport
*transport
, const char *name
,
598 const char *exec
, int fd
[2])
600 struct helper_data
*data
= transport
->data
;
602 /* Get_helper so connect is inited. */
603 get_helper(transport
);
605 die("Operation not supported by protocol.");
607 if (!process_connect_service(transport
, name
, exec
))
608 die("Can't connect to subservice %s.", name
);
610 fd
[0] = data
->helper
->out
;
611 fd
[1] = data
->helper
->in
;
615 static int fetch(struct transport
*transport
,
616 int nr_heads
, struct ref
**to_fetch
)
618 struct helper_data
*data
= transport
->data
;
621 if (process_connect(transport
, 0)) {
622 do_take_over(transport
);
623 return transport
->fetch(transport
, nr_heads
, to_fetch
);
627 for (i
= 0; i
< nr_heads
; i
++)
628 if (!(to_fetch
[i
]->status
& REF_STATUS_UPTODATE
))
635 return fetch_with_fetch(transport
, nr_heads
, to_fetch
);
638 return fetch_with_import(transport
, nr_heads
, to_fetch
);
643 static int push_update_ref_status(struct strbuf
*buf
,
645 struct ref
*remote_refs
)
648 int status
, forced
= 0;
650 if (starts_with(buf
->buf
, "ok ")) {
651 status
= REF_STATUS_OK
;
652 refname
= buf
->buf
+ 3;
653 } else if (starts_with(buf
->buf
, "error ")) {
654 status
= REF_STATUS_REMOTE_REJECT
;
655 refname
= buf
->buf
+ 6;
657 die("expected ok/error, helper said '%s'", buf
->buf
);
659 msg
= strchr(refname
, ' ');
661 struct strbuf msg_buf
= STRBUF_INIT
;
665 if (!unquote_c_style(&msg_buf
, msg
, &end
))
666 msg
= strbuf_detach(&msg_buf
, NULL
);
669 strbuf_release(&msg_buf
);
671 if (!strcmp(msg
, "no match")) {
672 status
= REF_STATUS_NONE
;
676 else if (!strcmp(msg
, "up to date")) {
677 status
= REF_STATUS_UPTODATE
;
681 else if (!strcmp(msg
, "non-fast forward")) {
682 status
= REF_STATUS_REJECT_NONFASTFORWARD
;
686 else if (!strcmp(msg
, "already exists")) {
687 status
= REF_STATUS_REJECT_ALREADY_EXISTS
;
691 else if (!strcmp(msg
, "fetch first")) {
692 status
= REF_STATUS_REJECT_FETCH_FIRST
;
696 else if (!strcmp(msg
, "needs force")) {
697 status
= REF_STATUS_REJECT_NEEDS_FORCE
;
701 else if (!strcmp(msg
, "stale info")) {
702 status
= REF_STATUS_REJECT_STALE
;
706 else if (!strcmp(msg
, "forced update")) {
714 *ref
= find_ref_by_name(*ref
, refname
);
716 *ref
= find_ref_by_name(remote_refs
, refname
);
718 warning("helper reported unexpected status of %s", refname
);
722 if ((*ref
)->status
!= REF_STATUS_NONE
) {
724 * Earlier, the ref was marked not to be pushed, so ignore the ref
725 * status reported by the remote helper if the latter is 'no match'.
727 if (status
== REF_STATUS_NONE
)
731 (*ref
)->status
= status
;
732 (*ref
)->forced_update
|= forced
;
733 (*ref
)->remote_status
= msg
;
734 return !(status
== REF_STATUS_OK
);
737 static void push_update_refs_status(struct helper_data
*data
,
738 struct ref
*remote_refs
,
741 struct strbuf buf
= STRBUF_INIT
;
742 struct ref
*ref
= remote_refs
;
746 recvline(data
, &buf
);
750 if (push_update_ref_status(&buf
, &ref
, remote_refs
))
753 if (flags
& TRANSPORT_PUSH_DRY_RUN
|| !data
->refspecs
|| data
->no_private_update
)
756 /* propagate back the update to the remote namespace */
757 private = apply_refspecs(data
->refspecs
, data
->refspec_nr
, ref
->name
);
760 update_ref("update by helper", private, ref
->new_sha1
, NULL
, 0, 0);
763 strbuf_release(&buf
);
766 static int push_refs_with_push(struct transport
*transport
,
767 struct ref
*remote_refs
, int flags
)
769 int force_all
= flags
& TRANSPORT_PUSH_FORCE
;
770 int mirror
= flags
& TRANSPORT_PUSH_MIRROR
;
771 struct helper_data
*data
= transport
->data
;
772 struct strbuf buf
= STRBUF_INIT
;
774 struct string_list cas_options
= STRING_LIST_INIT_DUP
;
775 struct string_list_item
*cas_option
;
777 get_helper(transport
);
781 for (ref
= remote_refs
; ref
; ref
= ref
->next
) {
782 if (!ref
->peer_ref
&& !mirror
)
785 /* Check for statuses set by set_ref_status_for_push() */
786 switch (ref
->status
) {
787 case REF_STATUS_REJECT_NONFASTFORWARD
:
788 case REF_STATUS_REJECT_STALE
:
789 case REF_STATUS_REJECT_ALREADY_EXISTS
:
790 case REF_STATUS_UPTODATE
:
799 strbuf_addstr(&buf
, "push ");
800 if (!ref
->deletion
) {
802 strbuf_addch(&buf
, '+');
804 strbuf_addstr(&buf
, ref
->peer_ref
->name
);
806 strbuf_addstr(&buf
, sha1_to_hex(ref
->new_sha1
));
808 strbuf_addch(&buf
, ':');
809 strbuf_addstr(&buf
, ref
->name
);
810 strbuf_addch(&buf
, '\n');
813 * The "--force-with-lease" options without explicit
814 * values to expect have already been expanded into
815 * the ref->old_sha1_expect[] field; we can ignore
816 * transport->smart_options->cas altogether and instead
817 * can enumerate them from the refs.
819 if (ref
->expect_old_sha1
) {
820 struct strbuf cas
= STRBUF_INIT
;
821 strbuf_addf(&cas
, "%s:%s",
822 ref
->name
, sha1_to_hex(ref
->old_sha1_expect
));
823 string_list_append(&cas_options
, strbuf_detach(&cas
, NULL
));
827 string_list_clear(&cas_options
, 0);
831 standard_options(transport
);
832 for_each_string_list_item(cas_option
, &cas_options
)
833 set_helper_option(transport
, "cas", cas_option
->string
);
835 if (flags
& TRANSPORT_PUSH_DRY_RUN
) {
836 if (set_helper_option(transport
, "dry-run", "true") != 0)
837 die("helper %s does not support dry-run", data
->name
);
840 strbuf_addch(&buf
, '\n');
841 sendline(data
, &buf
);
842 strbuf_release(&buf
);
844 push_update_refs_status(data
, remote_refs
, flags
);
848 static int push_refs_with_export(struct transport
*transport
,
849 struct ref
*remote_refs
, int flags
)
852 struct child_process
*helper
, exporter
;
853 struct helper_data
*data
= transport
->data
;
854 struct string_list revlist_args
= STRING_LIST_INIT_NODUP
;
855 struct strbuf buf
= STRBUF_INIT
;
858 die("remote-helper doesn't support push; refspec needed");
860 if (flags
& TRANSPORT_PUSH_DRY_RUN
) {
861 if (set_helper_option(transport
, "dry-run", "true") != 0)
862 die("helper %s does not support dry-run", data
->name
);
865 if (flags
& TRANSPORT_PUSH_FORCE
) {
866 if (set_helper_option(transport
, "force", "true") != 0)
867 warning("helper %s does not support 'force'", data
->name
);
870 helper
= get_helper(transport
);
872 write_constant(helper
->in
, "export\n");
876 for (ref
= remote_refs
; ref
; ref
= ref
->next
) {
878 unsigned char sha1
[20];
881 die("remote-helpers do not support ref deletion");
883 private = apply_refspecs(data
->refspecs
, data
->refspec_nr
, ref
->name
);
884 if (private && !get_sha1(private, sha1
)) {
885 strbuf_addf(&buf
, "^%s", private);
886 string_list_append(&revlist_args
, strbuf_detach(&buf
, NULL
));
887 hashcpy(ref
->old_sha1
, sha1
);
892 if (strcmp(ref
->peer_ref
->name
, ref
->name
))
893 die("remote-helpers do not support old:new syntax");
894 string_list_append(&revlist_args
, ref
->peer_ref
->name
);
898 if (get_exporter(transport
, &exporter
, &revlist_args
))
899 die("Couldn't run fast-export");
901 if (finish_command(&exporter
))
902 die("Error while running fast-export");
903 push_update_refs_status(data
, remote_refs
, flags
);
907 static int push_refs(struct transport
*transport
,
908 struct ref
*remote_refs
, int flags
)
910 struct helper_data
*data
= transport
->data
;
912 if (process_connect(transport
, 1)) {
913 do_take_over(transport
);
914 return transport
->push_refs(transport
, remote_refs
, flags
);
918 fprintf(stderr
, "No refs in common and none specified; doing nothing.\n"
919 "Perhaps you should specify a branch such as 'master'.\n");
924 return push_refs_with_push(transport
, remote_refs
, flags
);
927 return push_refs_with_export(transport
, remote_refs
, flags
);
933 static int has_attribute(const char *attrs
, const char *attr
) {
940 const char *space
= strchrnul(attrs
, ' ');
941 if (len
== space
- attrs
&& !strncmp(attrs
, attr
, len
))
949 static struct ref
*get_refs_list(struct transport
*transport
, int for_push
)
951 struct helper_data
*data
= transport
->data
;
952 struct child_process
*helper
;
953 struct ref
*ret
= NULL
;
954 struct ref
**tail
= &ret
;
956 struct strbuf buf
= STRBUF_INIT
;
958 helper
= get_helper(transport
);
960 if (process_connect(transport
, for_push
)) {
961 do_take_over(transport
);
962 return transport
->get_refs_list(transport
, for_push
);
965 if (data
->push
&& for_push
)
966 write_str_in_full(helper
->in
, "list for-push\n");
968 write_str_in_full(helper
->in
, "list\n");
972 recvline(data
, &buf
);
977 eov
= strchr(buf
.buf
, ' ');
979 die("Malformed response in ref list: %s", buf
.buf
);
980 eon
= strchr(eov
+ 1, ' ');
984 *tail
= alloc_ref(eov
+ 1);
985 if (buf
.buf
[0] == '@')
986 (*tail
)->symref
= xstrdup(buf
.buf
+ 1);
987 else if (buf
.buf
[0] != '?')
988 get_sha1_hex(buf
.buf
, (*tail
)->old_sha1
);
990 if (has_attribute(eon
+ 1, "unchanged")) {
991 (*tail
)->status
|= REF_STATUS_UPTODATE
;
992 read_ref((*tail
)->name
, (*tail
)->old_sha1
);
995 tail
= &((*tail
)->next
);
998 fprintf(stderr
, "Debug: Read ref listing.\n");
999 strbuf_release(&buf
);
1001 for (posn
= ret
; posn
; posn
= posn
->next
)
1002 resolve_remote_symref(posn
, ret
);
1007 int transport_helper_init(struct transport
*transport
, const char *name
)
1009 struct helper_data
*data
= xcalloc(sizeof(*data
), 1);
1012 if (getenv("GIT_TRANSPORT_HELPER_DEBUG"))
1015 transport
->data
= data
;
1016 transport
->set_option
= set_helper_option
;
1017 transport
->get_refs_list
= get_refs_list
;
1018 transport
->fetch
= fetch
;
1019 transport
->push_refs
= push_refs
;
1020 transport
->disconnect
= release_helper
;
1021 transport
->connect
= connect_helper
;
1022 transport
->smart_options
= &(data
->transport_options
);
1027 * Linux pipes can buffer 65536 bytes at once (and most platforms can
1028 * buffer less), so attempt reads and writes with up to that size.
1030 #define BUFFERSIZE 65536
1031 /* This should be enough to hold debugging message. */
1032 #define PBUFFERSIZE 8192
1034 /* Print bidirectional transfer loop debug message. */
1035 __attribute__((format (printf
, 1, 2)))
1036 static void transfer_debug(const char *fmt
, ...)
1039 char msgbuf
[PBUFFERSIZE
];
1040 static int debug_enabled
= -1;
1042 if (debug_enabled
< 0)
1043 debug_enabled
= getenv("GIT_TRANSLOOP_DEBUG") ? 1 : 0;
1047 va_start(args
, fmt
);
1048 vsnprintf(msgbuf
, PBUFFERSIZE
, fmt
, args
);
1050 fprintf(stderr
, "Transfer loop debugging: %s\n", msgbuf
);
1053 /* Stream state: More data may be coming in this direction. */
1054 #define SSTATE_TRANSFERING 0
1056 * Stream state: No more data coming in this direction, flushing rest of
1059 #define SSTATE_FLUSHING 1
1060 /* Stream state: Transfer in this direction finished. */
1061 #define SSTATE_FINISHED 2
1063 #define STATE_NEEDS_READING(state) ((state) <= SSTATE_TRANSFERING)
1064 #define STATE_NEEDS_WRITING(state) ((state) <= SSTATE_FLUSHING)
1065 #define STATE_NEEDS_CLOSING(state) ((state) == SSTATE_FLUSHING)
1067 /* Unidirectional transfer. */
1068 struct unidirectional_transfer
{
1073 /* Is source socket? */
1075 /* Is destination socket? */
1077 /* Transfer state (TRANSFERRING/FLUSHING/FINISHED) */
1080 char buf
[BUFFERSIZE
];
1083 /* Name of source. */
1084 const char *src_name
;
1085 /* Name of destination. */
1086 const char *dest_name
;
1089 /* Closes the target (for writing) if transfer has finished. */
1090 static void udt_close_if_finished(struct unidirectional_transfer
*t
)
1092 if (STATE_NEEDS_CLOSING(t
->state
) && !t
->bufuse
) {
1093 t
->state
= SSTATE_FINISHED
;
1094 if (t
->dest_is_sock
)
1095 shutdown(t
->dest
, SHUT_WR
);
1098 transfer_debug("Closed %s.", t
->dest_name
);
1103 * Tries to read read data from source into buffer. If buffer is full,
1104 * no data is read. Returns 0 on success, -1 on error.
1106 static int udt_do_read(struct unidirectional_transfer
*t
)
1110 if (t
->bufuse
== BUFFERSIZE
)
1111 return 0; /* No space for more. */
1113 transfer_debug("%s is readable", t
->src_name
);
1114 bytes
= read(t
->src
, t
->buf
+ t
->bufuse
, BUFFERSIZE
- t
->bufuse
);
1115 if (bytes
< 0 && errno
!= EWOULDBLOCK
&& errno
!= EAGAIN
&&
1117 error("read(%s) failed: %s", t
->src_name
, strerror(errno
));
1119 } else if (bytes
== 0) {
1120 transfer_debug("%s EOF (with %i bytes in buffer)",
1121 t
->src_name
, (int)t
->bufuse
);
1122 t
->state
= SSTATE_FLUSHING
;
1123 } else if (bytes
> 0) {
1125 transfer_debug("Read %i bytes from %s (buffer now at %i)",
1126 (int)bytes
, t
->src_name
, (int)t
->bufuse
);
1131 /* Tries to write data from buffer into destination. If buffer is empty,
1132 * no data is written. Returns 0 on success, -1 on error.
1134 static int udt_do_write(struct unidirectional_transfer
*t
)
1139 return 0; /* Nothing to write. */
1141 transfer_debug("%s is writable", t
->dest_name
);
1142 bytes
= xwrite(t
->dest
, t
->buf
, t
->bufuse
);
1143 if (bytes
< 0 && errno
!= EWOULDBLOCK
) {
1144 error("write(%s) failed: %s", t
->dest_name
, strerror(errno
));
1146 } else if (bytes
> 0) {
1149 memmove(t
->buf
, t
->buf
+ bytes
, t
->bufuse
);
1150 transfer_debug("Wrote %i bytes to %s (buffer now at %i)",
1151 (int)bytes
, t
->dest_name
, (int)t
->bufuse
);
1157 /* State of bidirectional transfer loop. */
1158 struct bidirectional_transfer_state
{
1159 /* Direction from program to git. */
1160 struct unidirectional_transfer ptg
;
1161 /* Direction from git to program. */
1162 struct unidirectional_transfer gtp
;
1165 static void *udt_copy_task_routine(void *udt
)
1167 struct unidirectional_transfer
*t
= (struct unidirectional_transfer
*)udt
;
1168 while (t
->state
!= SSTATE_FINISHED
) {
1169 if (STATE_NEEDS_READING(t
->state
))
1172 if (STATE_NEEDS_WRITING(t
->state
))
1173 if (udt_do_write(t
))
1175 if (STATE_NEEDS_CLOSING(t
->state
))
1176 udt_close_if_finished(t
);
1178 return udt
; /* Just some non-NULL value. */
1184 * Join thread, with appropriate errors on failure. Name is name for the
1185 * thread (for error messages). Returns 0 on success, 1 on failure.
1187 static int tloop_join(pthread_t thread
, const char *name
)
1191 err
= pthread_join(thread
, &tret
);
1193 error("%s thread failed", name
);
1197 error("%s thread failed to join: %s", name
, strerror(err
));
1204 * Spawn the transfer tasks and then wait for them. Returns 0 on success,
1207 static int tloop_spawnwait_tasks(struct bidirectional_transfer_state
*s
)
1209 pthread_t gtp_thread
;
1210 pthread_t ptg_thread
;
1213 err
= pthread_create(>p_thread
, NULL
, udt_copy_task_routine
,
1216 die("Can't start thread for copying data: %s", strerror(err
));
1217 err
= pthread_create(&ptg_thread
, NULL
, udt_copy_task_routine
,
1220 die("Can't start thread for copying data: %s", strerror(err
));
1222 ret
|= tloop_join(gtp_thread
, "Git to program copy");
1223 ret
|= tloop_join(ptg_thread
, "Program to git copy");
1228 /* Close the source and target (for writing) for transfer. */
1229 static void udt_kill_transfer(struct unidirectional_transfer
*t
)
1231 t
->state
= SSTATE_FINISHED
;
1233 * Socket read end left open isn't a disaster if nobody
1234 * attempts to read from it (mingw compat headers do not
1237 * We can't fully close the socket since otherwise gtp
1238 * task would first close the socket it sends data to
1239 * while closing the ptg file descriptors.
1241 if (!t
->src_is_sock
)
1243 if (t
->dest_is_sock
)
1244 shutdown(t
->dest
, SHUT_WR
);
1250 * Join process, with appropriate errors on failure. Name is name for the
1251 * process (for error messages). Returns 0 on success, 1 on failure.
1253 static int tloop_join(pid_t pid
, const char *name
)
1256 if (waitpid(pid
, &tret
, 0) < 0) {
1257 error("%s process failed to wait: %s", name
, strerror(errno
));
1260 if (!WIFEXITED(tret
) || WEXITSTATUS(tret
)) {
1261 error("%s process failed", name
);
1268 * Spawn the transfer tasks and then wait for them. Returns 0 on success,
1271 static int tloop_spawnwait_tasks(struct bidirectional_transfer_state
*s
)
1276 /* Fork thread #1: git to program. */
1279 die_errno("Can't start thread for copying data");
1280 else if (pid1
== 0) {
1281 udt_kill_transfer(&s
->ptg
);
1282 exit(udt_copy_task_routine(&s
->gtp
) ? 0 : 1);
1285 /* Fork thread #2: program to git. */
1288 die_errno("Can't start thread for copying data");
1289 else if (pid2
== 0) {
1290 udt_kill_transfer(&s
->gtp
);
1291 exit(udt_copy_task_routine(&s
->ptg
) ? 0 : 1);
1295 * Close both streams in parent as to not interfere with
1296 * end of file detection and wait for both tasks to finish.
1298 udt_kill_transfer(&s
->gtp
);
1299 udt_kill_transfer(&s
->ptg
);
1300 ret
|= tloop_join(pid1
, "Git to program copy");
1301 ret
|= tloop_join(pid2
, "Program to git copy");
1307 * Copies data from stdin to output and from input to stdout simultaneously.
1308 * Additionally filtering through given filter. If filter is NULL, uses
1311 int bidirectional_transfer_loop(int input
, int output
)
1313 struct bidirectional_transfer_state state
;
1315 /* Fill the state fields. */
1316 state
.ptg
.src
= input
;
1318 state
.ptg
.src_is_sock
= (input
== output
);
1319 state
.ptg
.dest_is_sock
= 0;
1320 state
.ptg
.state
= SSTATE_TRANSFERING
;
1321 state
.ptg
.bufuse
= 0;
1322 state
.ptg
.src_name
= "remote input";
1323 state
.ptg
.dest_name
= "stdout";
1326 state
.gtp
.dest
= output
;
1327 state
.gtp
.src_is_sock
= 0;
1328 state
.gtp
.dest_is_sock
= (input
== output
);
1329 state
.gtp
.state
= SSTATE_TRANSFERING
;
1330 state
.gtp
.bufuse
= 0;
1331 state
.gtp
.src_name
= "stdin";
1332 state
.gtp
.dest_name
= "remote output";
1334 return tloop_spawnwait_tasks(&state
);