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");
156 const char *capname
, *arg
;
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
&& skip_prefix(capname
, "refspec ", &arg
)) {
190 refspecs
[refspec_nr
++] = xstrdup(arg
);
191 } else if (!strcmp(capname
, "connect")) {
193 } else if (!strcmp(capname
, "signed-tags")) {
194 data
->signed_tags
= 1;
195 } else if (skip_prefix(capname
, "export-marks ", &arg
)) {
196 data
->export_marks
= xstrdup(arg
);
197 } else if (skip_prefix(capname
, "import-marks ", &arg
)) {
198 data
->import_marks
= xstrdup(arg
);
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
[] = {
262 TRANS_OPT_FOLLOWTAGS
,
266 static int set_helper_option(struct transport
*transport
,
267 const char *name
, const char *value
)
269 struct helper_data
*data
= transport
->data
;
270 struct strbuf buf
= STRBUF_INIT
;
271 int i
, ret
, is_bool
= 0;
273 get_helper(transport
);
278 for (i
= 0; i
< ARRAY_SIZE(unsupported_options
); i
++) {
279 if (!strcmp(name
, unsupported_options
[i
]))
283 for (i
= 0; i
< ARRAY_SIZE(boolean_options
); i
++) {
284 if (!strcmp(name
, boolean_options
[i
])) {
290 strbuf_addf(&buf
, "option %s ", name
);
292 strbuf_addstr(&buf
, value
? "true" : "false");
294 quote_c_style(value
, &buf
, NULL
, 0);
295 strbuf_addch(&buf
, '\n');
297 sendline(data
, &buf
);
298 if (recvline(data
, &buf
))
301 if (!strcmp(buf
.buf
, "ok"))
303 else if (starts_with(buf
.buf
, "error")) {
305 } else if (!strcmp(buf
.buf
, "unsupported"))
308 warning("%s unexpectedly said: '%s'", data
->name
, buf
.buf
);
311 strbuf_release(&buf
);
315 static void standard_options(struct transport
*t
)
321 set_helper_option(t
, "progress", t
->progress
? "true" : "false");
323 n
= snprintf(buf
, sizeof(buf
), "%d", v
+ 1);
324 if (n
>= sizeof(buf
))
325 die("impossibly large verbosity value");
326 set_helper_option(t
, "verbosity", buf
);
329 static int release_helper(struct transport
*transport
)
332 struct helper_data
*data
= transport
->data
;
333 free_refspec(data
->refspec_nr
, data
->refspecs
);
334 data
->refspecs
= NULL
;
335 res
= disconnect_helper(transport
);
336 free(transport
->data
);
340 static int fetch_with_fetch(struct transport
*transport
,
341 int nr_heads
, struct ref
**to_fetch
)
343 struct helper_data
*data
= transport
->data
;
345 struct strbuf buf
= STRBUF_INIT
;
347 standard_options(transport
);
348 if (data
->check_connectivity
&&
349 data
->transport_options
.check_self_contained_and_connected
)
350 set_helper_option(transport
, "check-connectivity", "true");
352 if (transport
->cloning
)
353 set_helper_option(transport
, "cloning", "true");
355 if (data
->transport_options
.update_shallow
)
356 set_helper_option(transport
, "update-shallow", "true");
358 for (i
= 0; i
< nr_heads
; i
++) {
359 const struct ref
*posn
= to_fetch
[i
];
360 if (posn
->status
& REF_STATUS_UPTODATE
)
363 strbuf_addf(&buf
, "fetch %s %s\n",
364 sha1_to_hex(posn
->old_sha1
), posn
->name
);
367 strbuf_addch(&buf
, '\n');
368 sendline(data
, &buf
);
371 if (recvline(data
, &buf
))
374 if (starts_with(buf
.buf
, "lock ")) {
375 const char *name
= buf
.buf
+ 5;
376 if (transport
->pack_lockfile
)
377 warning("%s also locked %s", data
->name
, name
);
379 transport
->pack_lockfile
= xstrdup(name
);
381 else if (data
->check_connectivity
&&
382 data
->transport_options
.check_self_contained_and_connected
&&
383 !strcmp(buf
.buf
, "connectivity-ok"))
384 data
->transport_options
.self_contained_and_connected
= 1;
388 warning("%s unexpectedly said: '%s'", data
->name
, buf
.buf
);
390 strbuf_release(&buf
);
394 static int get_importer(struct transport
*transport
, struct child_process
*fastimport
)
396 struct child_process
*helper
= get_helper(transport
);
397 struct helper_data
*data
= transport
->data
;
398 int cat_blob_fd
, code
;
399 memset(fastimport
, 0, sizeof(*fastimport
));
400 fastimport
->in
= helper
->out
;
401 argv_array_push(&fastimport
->args
, "fast-import");
402 argv_array_push(&fastimport
->args
, debug
? "--stats" : "--quiet");
404 if (data
->bidi_import
) {
405 cat_blob_fd
= xdup(helper
->in
);
406 argv_array_pushf(&fastimport
->args
, "--cat-blob-fd=%d", cat_blob_fd
);
408 fastimport
->git_cmd
= 1;
410 code
= start_command(fastimport
);
414 static int get_exporter(struct transport
*transport
,
415 struct child_process
*fastexport
,
416 struct string_list
*revlist_args
)
418 struct helper_data
*data
= transport
->data
;
419 struct child_process
*helper
= get_helper(transport
);
422 memset(fastexport
, 0, sizeof(*fastexport
));
424 /* we need to duplicate helper->in because we want to use it after
425 * fastexport is done with it. */
426 fastexport
->out
= dup(helper
->in
);
427 argv_array_push(&fastexport
->args
, "fast-export");
428 argv_array_push(&fastexport
->args
, "--use-done-feature");
429 argv_array_push(&fastexport
->args
, data
->signed_tags
?
430 "--signed-tags=verbatim" : "--signed-tags=warn-strip");
431 if (data
->export_marks
)
432 argv_array_pushf(&fastexport
->args
, "--export-marks=%s.tmp", data
->export_marks
);
433 if (data
->import_marks
)
434 argv_array_pushf(&fastexport
->args
, "--import-marks=%s", data
->import_marks
);
436 for (i
= 0; i
< revlist_args
->nr
; i
++)
437 argv_array_push(&fastexport
->args
, revlist_args
->items
[i
].string
);
439 fastexport
->git_cmd
= 1;
440 return start_command(fastexport
);
443 static int fetch_with_import(struct transport
*transport
,
444 int nr_heads
, struct ref
**to_fetch
)
446 struct child_process fastimport
;
447 struct helper_data
*data
= transport
->data
;
450 struct strbuf buf
= STRBUF_INIT
;
452 get_helper(transport
);
454 if (get_importer(transport
, &fastimport
))
455 die("Couldn't run fast-import");
457 for (i
= 0; i
< nr_heads
; i
++) {
459 if (posn
->status
& REF_STATUS_UPTODATE
)
462 strbuf_addf(&buf
, "import %s\n", posn
->name
);
463 sendline(data
, &buf
);
467 write_constant(data
->helper
->in
, "\n");
469 * remote-helpers that advertise the bidi-import capability are required to
470 * buffer the complete batch of import commands until this newline before
471 * sending data to fast-import.
472 * These helpers read back data from fast-import on their stdin, which could
473 * be mixed with import commands, otherwise.
476 if (finish_command(&fastimport
))
477 die("Error while running fast-import");
480 * The fast-import stream of a remote helper that advertises
481 * the "refspec" capability writes to the refs named after the
482 * right hand side of the first refspec matching each ref we
485 * (If no "refspec" capability was specified, for historical
486 * reasons we default to the equivalent of *:*.)
488 * Store the result in to_fetch[i].old_sha1. Callers such
489 * as "git fetch" can use the value to write feedback to the
490 * terminal, populate FETCH_HEAD, and determine what new value
491 * should be written to peer_ref if the update is a
492 * fast-forward or this is a forced update.
494 for (i
= 0; i
< nr_heads
; i
++) {
497 if (posn
->status
& REF_STATUS_UPTODATE
)
500 private = apply_refspecs(data
->refspecs
, data
->refspec_nr
, posn
->name
);
502 private = xstrdup(posn
->name
);
504 read_ref(private, posn
->old_sha1
);
508 strbuf_release(&buf
);
512 static int process_connect_service(struct transport
*transport
,
513 const char *name
, const char *exec
)
515 struct helper_data
*data
= transport
->data
;
516 struct strbuf cmdbuf
= STRBUF_INIT
;
517 struct child_process
*helper
;
518 int r
, duped
, ret
= 0;
521 helper
= get_helper(transport
);
524 * Yes, dup the pipe another time, as we need unbuffered version
525 * of input pipe as FILE*. fclose() closes the underlying fd and
526 * stream buffering only can be changed before first I/O operation
529 duped
= dup(helper
->out
);
531 die_errno("Can't dup helper output fd");
532 input
= xfdopen(duped
, "r");
533 setvbuf(input
, NULL
, _IONBF
, 0);
536 * Handle --upload-pack and friends. This is fire and forget...
537 * just warn if it fails.
539 if (strcmp(name
, exec
)) {
540 r
= set_helper_option(transport
, "servpath", exec
);
542 warning("Setting remote service path not supported by protocol.");
544 warning("Invalid remote service path.");
548 strbuf_addf(&cmdbuf
, "connect %s\n", name
);
552 sendline(data
, &cmdbuf
);
553 if (recvline_fh(input
, &cmdbuf
, name
))
556 if (!strcmp(cmdbuf
.buf
, "")) {
557 data
->no_disconnect_req
= 1;
559 fprintf(stderr
, "Debug: Smart transport connection "
562 } else if (!strcmp(cmdbuf
.buf
, "fallback")) {
564 fprintf(stderr
, "Debug: Falling back to dumb "
567 die("Unknown response to connect: %s",
575 static int process_connect(struct transport
*transport
,
578 struct helper_data
*data
= transport
->data
;
582 name
= for_push
? "git-receive-pack" : "git-upload-pack";
584 exec
= data
->transport_options
.receivepack
;
586 exec
= data
->transport_options
.uploadpack
;
588 return process_connect_service(transport
, name
, exec
);
591 static int connect_helper(struct transport
*transport
, const char *name
,
592 const char *exec
, int fd
[2])
594 struct helper_data
*data
= transport
->data
;
596 /* Get_helper so connect is inited. */
597 get_helper(transport
);
599 die("Operation not supported by protocol.");
601 if (!process_connect_service(transport
, name
, exec
))
602 die("Can't connect to subservice %s.", name
);
604 fd
[0] = data
->helper
->out
;
605 fd
[1] = data
->helper
->in
;
609 static int fetch(struct transport
*transport
,
610 int nr_heads
, struct ref
**to_fetch
)
612 struct helper_data
*data
= transport
->data
;
615 if (process_connect(transport
, 0)) {
616 do_take_over(transport
);
617 return transport
->fetch(transport
, nr_heads
, to_fetch
);
621 for (i
= 0; i
< nr_heads
; i
++)
622 if (!(to_fetch
[i
]->status
& REF_STATUS_UPTODATE
))
629 return fetch_with_fetch(transport
, nr_heads
, to_fetch
);
632 return fetch_with_import(transport
, nr_heads
, to_fetch
);
637 static int push_update_ref_status(struct strbuf
*buf
,
639 struct ref
*remote_refs
)
642 int status
, forced
= 0;
644 if (starts_with(buf
->buf
, "ok ")) {
645 status
= REF_STATUS_OK
;
646 refname
= buf
->buf
+ 3;
647 } else if (starts_with(buf
->buf
, "error ")) {
648 status
= REF_STATUS_REMOTE_REJECT
;
649 refname
= buf
->buf
+ 6;
651 die("expected ok/error, helper said '%s'", buf
->buf
);
653 msg
= strchr(refname
, ' ');
655 struct strbuf msg_buf
= STRBUF_INIT
;
659 if (!unquote_c_style(&msg_buf
, msg
, &end
))
660 msg
= strbuf_detach(&msg_buf
, NULL
);
663 strbuf_release(&msg_buf
);
665 if (!strcmp(msg
, "no match")) {
666 status
= REF_STATUS_NONE
;
670 else if (!strcmp(msg
, "up to date")) {
671 status
= REF_STATUS_UPTODATE
;
675 else if (!strcmp(msg
, "non-fast forward")) {
676 status
= REF_STATUS_REJECT_NONFASTFORWARD
;
680 else if (!strcmp(msg
, "already exists")) {
681 status
= REF_STATUS_REJECT_ALREADY_EXISTS
;
685 else if (!strcmp(msg
, "fetch first")) {
686 status
= REF_STATUS_REJECT_FETCH_FIRST
;
690 else if (!strcmp(msg
, "needs force")) {
691 status
= REF_STATUS_REJECT_NEEDS_FORCE
;
695 else if (!strcmp(msg
, "stale info")) {
696 status
= REF_STATUS_REJECT_STALE
;
700 else if (!strcmp(msg
, "forced update")) {
708 *ref
= find_ref_by_name(*ref
, refname
);
710 *ref
= find_ref_by_name(remote_refs
, refname
);
712 warning("helper reported unexpected status of %s", refname
);
716 if ((*ref
)->status
!= REF_STATUS_NONE
) {
718 * Earlier, the ref was marked not to be pushed, so ignore the ref
719 * status reported by the remote helper if the latter is 'no match'.
721 if (status
== REF_STATUS_NONE
)
725 (*ref
)->status
= status
;
726 (*ref
)->forced_update
|= forced
;
727 (*ref
)->remote_status
= msg
;
728 return !(status
== REF_STATUS_OK
);
731 static int push_update_refs_status(struct helper_data
*data
,
732 struct ref
*remote_refs
,
735 struct strbuf buf
= STRBUF_INIT
;
736 struct ref
*ref
= remote_refs
;
742 if (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
);
767 static int push_refs_with_push(struct transport
*transport
,
768 struct ref
*remote_refs
, int flags
)
770 int force_all
= flags
& TRANSPORT_PUSH_FORCE
;
771 int mirror
= flags
& TRANSPORT_PUSH_MIRROR
;
772 struct helper_data
*data
= transport
->data
;
773 struct strbuf buf
= STRBUF_INIT
;
775 struct string_list cas_options
= STRING_LIST_INIT_DUP
;
776 struct string_list_item
*cas_option
;
778 get_helper(transport
);
782 for (ref
= remote_refs
; ref
; ref
= ref
->next
) {
783 if (!ref
->peer_ref
&& !mirror
)
786 /* Check for statuses set by set_ref_status_for_push() */
787 switch (ref
->status
) {
788 case REF_STATUS_REJECT_NONFASTFORWARD
:
789 case REF_STATUS_REJECT_STALE
:
790 case REF_STATUS_REJECT_ALREADY_EXISTS
:
791 case REF_STATUS_UPTODATE
:
800 strbuf_addstr(&buf
, "push ");
801 if (!ref
->deletion
) {
803 strbuf_addch(&buf
, '+');
805 strbuf_addstr(&buf
, ref
->peer_ref
->name
);
807 strbuf_addstr(&buf
, sha1_to_hex(ref
->new_sha1
));
809 strbuf_addch(&buf
, ':');
810 strbuf_addstr(&buf
, ref
->name
);
811 strbuf_addch(&buf
, '\n');
814 * The "--force-with-lease" options without explicit
815 * values to expect have already been expanded into
816 * the ref->old_sha1_expect[] field; we can ignore
817 * transport->smart_options->cas altogether and instead
818 * can enumerate them from the refs.
820 if (ref
->expect_old_sha1
) {
821 struct strbuf cas
= STRBUF_INIT
;
822 strbuf_addf(&cas
, "%s:%s",
823 ref
->name
, sha1_to_hex(ref
->old_sha1_expect
));
824 string_list_append(&cas_options
, strbuf_detach(&cas
, NULL
));
828 string_list_clear(&cas_options
, 0);
832 standard_options(transport
);
833 for_each_string_list_item(cas_option
, &cas_options
)
834 set_helper_option(transport
, "cas", cas_option
->string
);
836 if (flags
& TRANSPORT_PUSH_DRY_RUN
) {
837 if (set_helper_option(transport
, "dry-run", "true") != 0)
838 die("helper %s does not support dry-run", data
->name
);
839 } else if (flags
& TRANSPORT_PUSH_CERT
) {
840 if (set_helper_option(transport
, TRANS_OPT_PUSH_CERT
, "true") != 0)
841 die("helper %s does not support --signed", data
->name
);
844 strbuf_addch(&buf
, '\n');
845 sendline(data
, &buf
);
846 strbuf_release(&buf
);
848 return push_update_refs_status(data
, remote_refs
, flags
);
851 static int push_refs_with_export(struct transport
*transport
,
852 struct ref
*remote_refs
, int flags
)
855 struct child_process
*helper
, exporter
;
856 struct helper_data
*data
= transport
->data
;
857 struct string_list revlist_args
= STRING_LIST_INIT_DUP
;
858 struct strbuf buf
= STRBUF_INIT
;
861 die("remote-helper doesn't support push; refspec needed");
863 if (flags
& TRANSPORT_PUSH_DRY_RUN
) {
864 if (set_helper_option(transport
, "dry-run", "true") != 0)
865 die("helper %s does not support dry-run", data
->name
);
866 } else if (flags
& TRANSPORT_PUSH_CERT
) {
867 if (set_helper_option(transport
, TRANS_OPT_PUSH_CERT
, "true") != 0)
868 die("helper %s does not support dry-run", data
->name
);
871 if (flags
& TRANSPORT_PUSH_FORCE
) {
872 if (set_helper_option(transport
, "force", "true") != 0)
873 warning("helper %s does not support 'force'", data
->name
);
876 helper
= get_helper(transport
);
878 write_constant(helper
->in
, "export\n");
880 for (ref
= remote_refs
; ref
; ref
= ref
->next
) {
882 unsigned char sha1
[20];
884 private = apply_refspecs(data
->refspecs
, data
->refspec_nr
, ref
->name
);
885 if (private && !get_sha1(private, sha1
)) {
886 strbuf_addf(&buf
, "^%s", private);
887 string_list_append(&revlist_args
, strbuf_detach(&buf
, NULL
));
888 hashcpy(ref
->old_sha1
, sha1
);
893 if (strcmp(ref
->name
, ref
->peer_ref
->name
)) {
894 if (!ref
->deletion
) {
898 /* Follow symbolic refs (mainly for HEAD). */
899 name
= resolve_ref_unsafe(ref
->peer_ref
->name
, sha1
, 1, &flag
);
900 if (!name
|| !(flag
& REF_ISSYMREF
))
901 name
= ref
->peer_ref
->name
;
903 strbuf_addf(&buf
, "%s:%s", name
, ref
->name
);
905 strbuf_addf(&buf
, ":%s", ref
->name
);
907 string_list_append(&revlist_args
, "--refspec");
908 string_list_append(&revlist_args
, buf
.buf
);
909 strbuf_release(&buf
);
912 string_list_append(&revlist_args
, ref
->peer_ref
->name
);
916 if (get_exporter(transport
, &exporter
, &revlist_args
))
917 die("Couldn't run fast-export");
919 string_list_clear(&revlist_args
, 1);
921 if (finish_command(&exporter
))
922 die("Error while running fast-export");
923 if (push_update_refs_status(data
, remote_refs
, flags
))
926 if (data
->export_marks
) {
927 strbuf_addf(&buf
, "%s.tmp", data
->export_marks
);
928 rename(buf
.buf
, data
->export_marks
);
929 strbuf_release(&buf
);
935 static int push_refs(struct transport
*transport
,
936 struct ref
*remote_refs
, int flags
)
938 struct helper_data
*data
= transport
->data
;
940 if (process_connect(transport
, 1)) {
941 do_take_over(transport
);
942 return transport
->push_refs(transport
, remote_refs
, flags
);
946 fprintf(stderr
, "No refs in common and none specified; doing nothing.\n"
947 "Perhaps you should specify a branch such as 'master'.\n");
952 return push_refs_with_push(transport
, remote_refs
, flags
);
955 return push_refs_with_export(transport
, remote_refs
, flags
);
961 static int has_attribute(const char *attrs
, const char *attr
) {
968 const char *space
= strchrnul(attrs
, ' ');
969 if (len
== space
- attrs
&& !strncmp(attrs
, attr
, len
))
977 static struct ref
*get_refs_list(struct transport
*transport
, int for_push
)
979 struct helper_data
*data
= transport
->data
;
980 struct child_process
*helper
;
981 struct ref
*ret
= NULL
;
982 struct ref
**tail
= &ret
;
984 struct strbuf buf
= STRBUF_INIT
;
986 helper
= get_helper(transport
);
988 if (process_connect(transport
, for_push
)) {
989 do_take_over(transport
);
990 return transport
->get_refs_list(transport
, for_push
);
993 if (data
->push
&& for_push
)
994 write_str_in_full(helper
->in
, "list for-push\n");
996 write_str_in_full(helper
->in
, "list\n");
1000 if (recvline(data
, &buf
))
1006 eov
= strchr(buf
.buf
, ' ');
1008 die("Malformed response in ref list: %s", buf
.buf
);
1009 eon
= strchr(eov
+ 1, ' ');
1013 *tail
= alloc_ref(eov
+ 1);
1014 if (buf
.buf
[0] == '@')
1015 (*tail
)->symref
= xstrdup(buf
.buf
+ 1);
1016 else if (buf
.buf
[0] != '?')
1017 get_sha1_hex(buf
.buf
, (*tail
)->old_sha1
);
1019 if (has_attribute(eon
+ 1, "unchanged")) {
1020 (*tail
)->status
|= REF_STATUS_UPTODATE
;
1021 read_ref((*tail
)->name
, (*tail
)->old_sha1
);
1024 tail
= &((*tail
)->next
);
1027 fprintf(stderr
, "Debug: Read ref listing.\n");
1028 strbuf_release(&buf
);
1030 for (posn
= ret
; posn
; posn
= posn
->next
)
1031 resolve_remote_symref(posn
, ret
);
1036 int transport_helper_init(struct transport
*transport
, const char *name
)
1038 struct helper_data
*data
= xcalloc(1, sizeof(*data
));
1041 if (getenv("GIT_TRANSPORT_HELPER_DEBUG"))
1044 transport
->data
= data
;
1045 transport
->set_option
= set_helper_option
;
1046 transport
->get_refs_list
= get_refs_list
;
1047 transport
->fetch
= fetch
;
1048 transport
->push_refs
= push_refs
;
1049 transport
->disconnect
= release_helper
;
1050 transport
->connect
= connect_helper
;
1051 transport
->smart_options
= &(data
->transport_options
);
1056 * Linux pipes can buffer 65536 bytes at once (and most platforms can
1057 * buffer less), so attempt reads and writes with up to that size.
1059 #define BUFFERSIZE 65536
1060 /* This should be enough to hold debugging message. */
1061 #define PBUFFERSIZE 8192
1063 /* Print bidirectional transfer loop debug message. */
1064 __attribute__((format (printf
, 1, 2)))
1065 static void transfer_debug(const char *fmt
, ...)
1068 char msgbuf
[PBUFFERSIZE
];
1069 static int debug_enabled
= -1;
1071 if (debug_enabled
< 0)
1072 debug_enabled
= getenv("GIT_TRANSLOOP_DEBUG") ? 1 : 0;
1076 va_start(args
, fmt
);
1077 vsnprintf(msgbuf
, PBUFFERSIZE
, fmt
, args
);
1079 fprintf(stderr
, "Transfer loop debugging: %s\n", msgbuf
);
1082 /* Stream state: More data may be coming in this direction. */
1083 #define SSTATE_TRANSFERING 0
1085 * Stream state: No more data coming in this direction, flushing rest of
1088 #define SSTATE_FLUSHING 1
1089 /* Stream state: Transfer in this direction finished. */
1090 #define SSTATE_FINISHED 2
1092 #define STATE_NEEDS_READING(state) ((state) <= SSTATE_TRANSFERING)
1093 #define STATE_NEEDS_WRITING(state) ((state) <= SSTATE_FLUSHING)
1094 #define STATE_NEEDS_CLOSING(state) ((state) == SSTATE_FLUSHING)
1096 /* Unidirectional transfer. */
1097 struct unidirectional_transfer
{
1102 /* Is source socket? */
1104 /* Is destination socket? */
1106 /* Transfer state (TRANSFERRING/FLUSHING/FINISHED) */
1109 char buf
[BUFFERSIZE
];
1112 /* Name of source. */
1113 const char *src_name
;
1114 /* Name of destination. */
1115 const char *dest_name
;
1118 /* Closes the target (for writing) if transfer has finished. */
1119 static void udt_close_if_finished(struct unidirectional_transfer
*t
)
1121 if (STATE_NEEDS_CLOSING(t
->state
) && !t
->bufuse
) {
1122 t
->state
= SSTATE_FINISHED
;
1123 if (t
->dest_is_sock
)
1124 shutdown(t
->dest
, SHUT_WR
);
1127 transfer_debug("Closed %s.", t
->dest_name
);
1132 * Tries to read read data from source into buffer. If buffer is full,
1133 * no data is read. Returns 0 on success, -1 on error.
1135 static int udt_do_read(struct unidirectional_transfer
*t
)
1139 if (t
->bufuse
== BUFFERSIZE
)
1140 return 0; /* No space for more. */
1142 transfer_debug("%s is readable", t
->src_name
);
1143 bytes
= read(t
->src
, t
->buf
+ t
->bufuse
, BUFFERSIZE
- t
->bufuse
);
1144 if (bytes
< 0 && errno
!= EWOULDBLOCK
&& errno
!= EAGAIN
&&
1146 error("read(%s) failed: %s", t
->src_name
, strerror(errno
));
1148 } else if (bytes
== 0) {
1149 transfer_debug("%s EOF (with %i bytes in buffer)",
1150 t
->src_name
, (int)t
->bufuse
);
1151 t
->state
= SSTATE_FLUSHING
;
1152 } else if (bytes
> 0) {
1154 transfer_debug("Read %i bytes from %s (buffer now at %i)",
1155 (int)bytes
, t
->src_name
, (int)t
->bufuse
);
1160 /* Tries to write data from buffer into destination. If buffer is empty,
1161 * no data is written. Returns 0 on success, -1 on error.
1163 static int udt_do_write(struct unidirectional_transfer
*t
)
1168 return 0; /* Nothing to write. */
1170 transfer_debug("%s is writable", t
->dest_name
);
1171 bytes
= xwrite(t
->dest
, t
->buf
, t
->bufuse
);
1172 if (bytes
< 0 && errno
!= EWOULDBLOCK
) {
1173 error("write(%s) failed: %s", t
->dest_name
, strerror(errno
));
1175 } else if (bytes
> 0) {
1178 memmove(t
->buf
, t
->buf
+ bytes
, t
->bufuse
);
1179 transfer_debug("Wrote %i bytes to %s (buffer now at %i)",
1180 (int)bytes
, t
->dest_name
, (int)t
->bufuse
);
1186 /* State of bidirectional transfer loop. */
1187 struct bidirectional_transfer_state
{
1188 /* Direction from program to git. */
1189 struct unidirectional_transfer ptg
;
1190 /* Direction from git to program. */
1191 struct unidirectional_transfer gtp
;
1194 static void *udt_copy_task_routine(void *udt
)
1196 struct unidirectional_transfer
*t
= (struct unidirectional_transfer
*)udt
;
1197 while (t
->state
!= SSTATE_FINISHED
) {
1198 if (STATE_NEEDS_READING(t
->state
))
1201 if (STATE_NEEDS_WRITING(t
->state
))
1202 if (udt_do_write(t
))
1204 if (STATE_NEEDS_CLOSING(t
->state
))
1205 udt_close_if_finished(t
);
1207 return udt
; /* Just some non-NULL value. */
1213 * Join thread, with appropriate errors on failure. Name is name for the
1214 * thread (for error messages). Returns 0 on success, 1 on failure.
1216 static int tloop_join(pthread_t thread
, const char *name
)
1220 err
= pthread_join(thread
, &tret
);
1222 error("%s thread failed", name
);
1226 error("%s thread failed to join: %s", name
, strerror(err
));
1233 * Spawn the transfer tasks and then wait for them. Returns 0 on success,
1236 static int tloop_spawnwait_tasks(struct bidirectional_transfer_state
*s
)
1238 pthread_t gtp_thread
;
1239 pthread_t ptg_thread
;
1242 err
= pthread_create(>p_thread
, NULL
, udt_copy_task_routine
,
1245 die("Can't start thread for copying data: %s", strerror(err
));
1246 err
= pthread_create(&ptg_thread
, NULL
, udt_copy_task_routine
,
1249 die("Can't start thread for copying data: %s", strerror(err
));
1251 ret
|= tloop_join(gtp_thread
, "Git to program copy");
1252 ret
|= tloop_join(ptg_thread
, "Program to git copy");
1257 /* Close the source and target (for writing) for transfer. */
1258 static void udt_kill_transfer(struct unidirectional_transfer
*t
)
1260 t
->state
= SSTATE_FINISHED
;
1262 * Socket read end left open isn't a disaster if nobody
1263 * attempts to read from it (mingw compat headers do not
1266 * We can't fully close the socket since otherwise gtp
1267 * task would first close the socket it sends data to
1268 * while closing the ptg file descriptors.
1270 if (!t
->src_is_sock
)
1272 if (t
->dest_is_sock
)
1273 shutdown(t
->dest
, SHUT_WR
);
1279 * Join process, with appropriate errors on failure. Name is name for the
1280 * process (for error messages). Returns 0 on success, 1 on failure.
1282 static int tloop_join(pid_t pid
, const char *name
)
1285 if (waitpid(pid
, &tret
, 0) < 0) {
1286 error("%s process failed to wait: %s", name
, strerror(errno
));
1289 if (!WIFEXITED(tret
) || WEXITSTATUS(tret
)) {
1290 error("%s process failed", name
);
1297 * Spawn the transfer tasks and then wait for them. Returns 0 on success,
1300 static int tloop_spawnwait_tasks(struct bidirectional_transfer_state
*s
)
1305 /* Fork thread #1: git to program. */
1308 die_errno("Can't start thread for copying data");
1309 else if (pid1
== 0) {
1310 udt_kill_transfer(&s
->ptg
);
1311 exit(udt_copy_task_routine(&s
->gtp
) ? 0 : 1);
1314 /* Fork thread #2: program to git. */
1317 die_errno("Can't start thread for copying data");
1318 else if (pid2
== 0) {
1319 udt_kill_transfer(&s
->gtp
);
1320 exit(udt_copy_task_routine(&s
->ptg
) ? 0 : 1);
1324 * Close both streams in parent as to not interfere with
1325 * end of file detection and wait for both tasks to finish.
1327 udt_kill_transfer(&s
->gtp
);
1328 udt_kill_transfer(&s
->ptg
);
1329 ret
|= tloop_join(pid1
, "Git to program copy");
1330 ret
|= tloop_join(pid2
, "Program to git copy");
1336 * Copies data from stdin to output and from input to stdout simultaneously.
1337 * Additionally filtering through given filter. If filter is NULL, uses
1340 int bidirectional_transfer_loop(int input
, int output
)
1342 struct bidirectional_transfer_state state
;
1344 /* Fill the state fields. */
1345 state
.ptg
.src
= input
;
1347 state
.ptg
.src_is_sock
= (input
== output
);
1348 state
.ptg
.dest_is_sock
= 0;
1349 state
.ptg
.state
= SSTATE_TRANSFERING
;
1350 state
.ptg
.bufuse
= 0;
1351 state
.ptg
.src_name
= "remote input";
1352 state
.ptg
.dest_name
= "stdout";
1355 state
.gtp
.dest
= output
;
1356 state
.gtp
.src_is_sock
= 0;
1357 state
.gtp
.dest_is_sock
= (input
== output
);
1358 state
.gtp
.state
= SSTATE_TRANSFERING
;
1359 state
.gtp
.bufuse
= 0;
1360 state
.gtp
.src_name
= "stdin";
1361 state
.gtp
.dest_name
= "remote output";
1363 return tloop_spawnwait_tasks(&state
);