4 #include "run-command.h"
10 #include "string-list.h"
11 #include "thread-utils.h"
17 struct child_process
*helper
;
25 no_disconnect_req
: 1;
28 /* These go from remote name (as in "list") to private name */
29 struct refspec
*refspecs
;
31 /* Transport options for fetch-pack/send-pack (should one of
34 struct git_transport_options transport_options
;
37 static void sendline(struct helper_data
*helper
, struct strbuf
*buffer
)
40 fprintf(stderr
, "Debug: Remote helper: -> %s", buffer
->buf
);
41 if (write_in_full(helper
->helper
->in
, buffer
->buf
, buffer
->len
)
43 die_errno("Full write to remote helper failed");
46 static int recvline_fh(FILE *helper
, struct strbuf
*buffer
)
50 fprintf(stderr
, "Debug: Remote helper: Waiting...\n");
51 if (strbuf_getline(buffer
, helper
, '\n') == EOF
) {
53 fprintf(stderr
, "Debug: Remote helper quit.\n");
58 fprintf(stderr
, "Debug: Remote helper: <- %s\n", buffer
->buf
);
62 static int recvline(struct helper_data
*helper
, struct strbuf
*buffer
)
64 return recvline_fh(helper
->out
, buffer
);
67 static void xchgline(struct helper_data
*helper
, struct strbuf
*buffer
)
69 sendline(helper
, buffer
);
70 recvline(helper
, buffer
);
73 static void write_constant(int fd
, const char *str
)
76 fprintf(stderr
, "Debug: Remote helper: -> %s", str
);
77 if (write_in_full(fd
, str
, strlen(str
)) != strlen(str
))
78 die_errno("Full write to remote helper failed");
81 static const char *remove_ext_force(const char *url
)
84 const char *colon
= strchr(url
, ':');
85 if (colon
&& colon
[1] == ':')
91 static void do_take_over(struct transport
*transport
)
93 struct helper_data
*data
;
94 data
= (struct helper_data
*)transport
->data
;
95 transport_take_over(transport
, data
->helper
);
100 static struct child_process
*get_helper(struct transport
*transport
)
102 struct helper_data
*data
= transport
->data
;
103 struct strbuf buf
= STRBUF_INIT
;
104 struct child_process
*helper
;
105 const char **refspecs
= NULL
;
107 int refspec_alloc
= 0;
110 char git_dir_buf
[sizeof(GIT_DIR_ENVIRONMENT
) + PATH_MAX
+ 1];
111 const char *helper_env
[] = {
120 helper
= xcalloc(1, sizeof(*helper
));
124 helper
->argv
= xcalloc(4, sizeof(*helper
->argv
));
125 strbuf_addf(&buf
, "git-remote-%s", data
->name
);
126 helper
->argv
[0] = strbuf_detach(&buf
, NULL
);
127 helper
->argv
[1] = transport
->remote
->name
;
128 helper
->argv
[2] = remove_ext_force(transport
->url
);
130 helper
->silent_exec_failure
= 1;
132 snprintf(git_dir_buf
, sizeof(git_dir_buf
), "%s=%s", GIT_DIR_ENVIRONMENT
, get_git_dir());
133 helper
->env
= helper_env
;
135 code
= start_command(helper
);
136 if (code
< 0 && errno
== ENOENT
)
137 die("Unable to find remote helper for '%s'", data
->name
);
141 data
->helper
= helper
;
142 data
->no_disconnect_req
= 0;
145 * Open the output as FILE* so strbuf_getline() can be used.
146 * Do this with duped fd because fclose() will close the fd,
147 * and stuff like taking over will require the fd to remain.
149 duped
= dup(helper
->out
);
151 die_errno("Can't dup helper output fd");
152 data
->out
= xfdopen(duped
, "r");
154 write_constant(helper
->in
, "capabilities\n");
159 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
, "export"))
182 else if (!data
->refspecs
&& !prefixcmp(capname
, "refspec ")) {
186 refspecs
[refspec_nr
++] = strdup(capname
+ strlen("refspec "));
187 } else if (!strcmp(capname
, "connect")) {
189 } else if (!prefixcmp(capname
, "export-marks ")) {
190 struct strbuf arg
= STRBUF_INIT
;
191 strbuf_addstr(&arg
, "--export-marks=");
192 strbuf_addstr(&arg
, capname
+ strlen("export-marks "));
193 data
->export_marks
= strbuf_detach(&arg
, NULL
);
194 } else if (!prefixcmp(capname
, "import-marks")) {
195 struct strbuf arg
= STRBUF_INIT
;
196 strbuf_addstr(&arg
, "--import-marks=");
197 strbuf_addstr(&arg
, capname
+ strlen("import-marks "));
198 data
->import_marks
= strbuf_detach(&arg
, NULL
);
199 } else if (mandatory
) {
200 die("Unknown mandatory capability %s. This remote "
201 "helper probably needs newer version of Git.\n",
207 data
->refspec_nr
= refspec_nr
;
208 data
->refspecs
= parse_fetch_refspec(refspec_nr
, refspecs
);
209 for (i
= 0; i
< refspec_nr
; i
++) {
210 free((char *)refspecs
[i
]);
214 strbuf_release(&buf
);
216 fprintf(stderr
, "Debug: Capabilities complete.\n");
220 static int disconnect_helper(struct transport
*transport
)
222 struct helper_data
*data
= transport
->data
;
223 struct strbuf buf
= STRBUF_INIT
;
228 fprintf(stderr
, "Debug: Disconnecting.\n");
229 if (!data
->no_disconnect_req
) {
230 strbuf_addf(&buf
, "\n");
231 sendline(data
, &buf
);
233 close(data
->helper
->in
);
234 close(data
->helper
->out
);
236 res
= finish_command(data
->helper
);
237 free((char *)data
->helper
->argv
[0]);
238 free(data
->helper
->argv
);
245 static const char *unsupported_options
[] = {
246 TRANS_OPT_UPLOADPACK
,
247 TRANS_OPT_RECEIVEPACK
,
251 static const char *boolean_options
[] = {
257 static int set_helper_option(struct transport
*transport
,
258 const char *name
, const char *value
)
260 struct helper_data
*data
= transport
->data
;
261 struct strbuf buf
= STRBUF_INIT
;
262 int i
, ret
, is_bool
= 0;
264 get_helper(transport
);
269 for (i
= 0; i
< ARRAY_SIZE(unsupported_options
); i
++) {
270 if (!strcmp(name
, unsupported_options
[i
]))
274 for (i
= 0; i
< ARRAY_SIZE(boolean_options
); i
++) {
275 if (!strcmp(name
, boolean_options
[i
])) {
281 strbuf_addf(&buf
, "option %s ", name
);
283 strbuf_addstr(&buf
, value
? "true" : "false");
285 quote_c_style(value
, &buf
, NULL
, 0);
286 strbuf_addch(&buf
, '\n');
288 xchgline(data
, &buf
);
290 if (!strcmp(buf
.buf
, "ok"))
292 else if (!prefixcmp(buf
.buf
, "error")) {
294 } else if (!strcmp(buf
.buf
, "unsupported"))
297 warning("%s unexpectedly said: '%s'", data
->name
, buf
.buf
);
300 strbuf_release(&buf
);
304 static void standard_options(struct transport
*t
)
310 set_helper_option(t
, "progress", t
->progress
? "true" : "false");
312 n
= snprintf(buf
, sizeof(buf
), "%d", v
+ 1);
313 if (n
>= sizeof(buf
))
314 die("impossibly large verbosity value");
315 set_helper_option(t
, "verbosity", buf
);
318 static int release_helper(struct transport
*transport
)
321 struct helper_data
*data
= transport
->data
;
322 free_refspec(data
->refspec_nr
, data
->refspecs
);
323 data
->refspecs
= NULL
;
324 res
= disconnect_helper(transport
);
325 free(transport
->data
);
329 static int fetch_with_fetch(struct transport
*transport
,
330 int nr_heads
, struct ref
**to_fetch
)
332 struct helper_data
*data
= transport
->data
;
334 struct strbuf buf
= STRBUF_INIT
;
336 standard_options(transport
);
338 for (i
= 0; i
< nr_heads
; i
++) {
339 const struct ref
*posn
= to_fetch
[i
];
340 if (posn
->status
& REF_STATUS_UPTODATE
)
343 strbuf_addf(&buf
, "fetch %s %s\n",
344 sha1_to_hex(posn
->old_sha1
), posn
->name
);
347 strbuf_addch(&buf
, '\n');
348 sendline(data
, &buf
);
351 recvline(data
, &buf
);
353 if (!prefixcmp(buf
.buf
, "lock ")) {
354 const char *name
= buf
.buf
+ 5;
355 if (transport
->pack_lockfile
)
356 warning("%s also locked %s", data
->name
, name
);
358 transport
->pack_lockfile
= xstrdup(name
);
363 warning("%s unexpectedly said: '%s'", data
->name
, buf
.buf
);
365 strbuf_release(&buf
);
369 static int get_importer(struct transport
*transport
, struct child_process
*fastimport
)
371 struct child_process
*helper
= get_helper(transport
);
372 memset(fastimport
, 0, sizeof(*fastimport
));
373 fastimport
->in
= helper
->out
;
374 fastimport
->argv
= xcalloc(5, sizeof(*fastimport
->argv
));
375 fastimport
->argv
[0] = "fast-import";
376 fastimport
->argv
[1] = "--quiet";
378 fastimport
->git_cmd
= 1;
379 return start_command(fastimport
);
382 static int get_exporter(struct transport
*transport
,
383 struct child_process
*fastexport
,
384 struct string_list
*revlist_args
)
386 struct helper_data
*data
= transport
->data
;
387 struct child_process
*helper
= get_helper(transport
);
389 memset(fastexport
, 0, sizeof(*fastexport
));
391 /* we need to duplicate helper->in because we want to use it after
392 * fastexport is done with it. */
393 fastexport
->out
= dup(helper
->in
);
394 fastexport
->argv
= xcalloc(5 + revlist_args
->nr
, sizeof(*fastexport
->argv
));
395 fastexport
->argv
[argc
++] = "fast-export";
396 fastexport
->argv
[argc
++] = "--use-done-feature";
397 if (data
->export_marks
)
398 fastexport
->argv
[argc
++] = data
->export_marks
;
399 if (data
->import_marks
)
400 fastexport
->argv
[argc
++] = data
->import_marks
;
402 for (i
= 0; i
< revlist_args
->nr
; i
++)
403 fastexport
->argv
[argc
++] = revlist_args
->items
[i
].string
;
405 fastexport
->git_cmd
= 1;
406 return start_command(fastexport
);
409 static int fetch_with_import(struct transport
*transport
,
410 int nr_heads
, struct ref
**to_fetch
)
412 struct child_process fastimport
;
413 struct helper_data
*data
= transport
->data
;
416 struct strbuf buf
= STRBUF_INIT
;
418 get_helper(transport
);
420 if (get_importer(transport
, &fastimport
))
421 die("Couldn't run fast-import");
423 for (i
= 0; i
< nr_heads
; i
++) {
425 if (posn
->status
& REF_STATUS_UPTODATE
)
428 strbuf_addf(&buf
, "import %s\n", posn
->name
);
429 sendline(data
, &buf
);
433 write_constant(data
->helper
->in
, "\n");
435 if (finish_command(&fastimport
))
436 die("Error while running fast-import");
437 free(fastimport
.argv
);
438 fastimport
.argv
= NULL
;
440 for (i
= 0; i
< nr_heads
; i
++) {
443 if (posn
->status
& REF_STATUS_UPTODATE
)
446 private = apply_refspecs(data
->refspecs
, data
->refspec_nr
, posn
->name
);
448 private = strdup(posn
->name
);
449 read_ref(private, posn
->old_sha1
);
452 strbuf_release(&buf
);
456 static int process_connect_service(struct transport
*transport
,
457 const char *name
, const char *exec
)
459 struct helper_data
*data
= transport
->data
;
460 struct strbuf cmdbuf
= STRBUF_INIT
;
461 struct child_process
*helper
;
462 int r
, duped
, ret
= 0;
465 helper
= get_helper(transport
);
468 * Yes, dup the pipe another time, as we need unbuffered version
469 * of input pipe as FILE*. fclose() closes the underlying fd and
470 * stream buffering only can be changed before first I/O operation
473 duped
= dup(helper
->out
);
475 die_errno("Can't dup helper output fd");
476 input
= xfdopen(duped
, "r");
477 setvbuf(input
, NULL
, _IONBF
, 0);
480 * Handle --upload-pack and friends. This is fire and forget...
481 * just warn if it fails.
483 if (strcmp(name
, exec
)) {
484 r
= set_helper_option(transport
, "servpath", exec
);
486 warning("Setting remote service path not supported by protocol.");
488 warning("Invalid remote service path.");
492 strbuf_addf(&cmdbuf
, "connect %s\n", name
);
496 sendline(data
, &cmdbuf
);
497 recvline_fh(input
, &cmdbuf
);
498 if (!strcmp(cmdbuf
.buf
, "")) {
499 data
->no_disconnect_req
= 1;
501 fprintf(stderr
, "Debug: Smart transport connection "
504 } else if (!strcmp(cmdbuf
.buf
, "fallback")) {
506 fprintf(stderr
, "Debug: Falling back to dumb "
509 die("Unknown response to connect: %s",
517 static int process_connect(struct transport
*transport
,
520 struct helper_data
*data
= transport
->data
;
524 name
= for_push
? "git-receive-pack" : "git-upload-pack";
526 exec
= data
->transport_options
.receivepack
;
528 exec
= data
->transport_options
.uploadpack
;
530 return process_connect_service(transport
, name
, exec
);
533 static int connect_helper(struct transport
*transport
, const char *name
,
534 const char *exec
, int fd
[2])
536 struct helper_data
*data
= transport
->data
;
538 /* Get_helper so connect is inited. */
539 get_helper(transport
);
541 die("Operation not supported by protocol.");
543 if (!process_connect_service(transport
, name
, exec
))
544 die("Can't connect to subservice %s.", name
);
546 fd
[0] = data
->helper
->out
;
547 fd
[1] = data
->helper
->in
;
551 static int fetch(struct transport
*transport
,
552 int nr_heads
, struct ref
**to_fetch
)
554 struct helper_data
*data
= transport
->data
;
557 if (process_connect(transport
, 0)) {
558 do_take_over(transport
);
559 return transport
->fetch(transport
, nr_heads
, to_fetch
);
563 for (i
= 0; i
< nr_heads
; i
++)
564 if (!(to_fetch
[i
]->status
& REF_STATUS_UPTODATE
))
571 return fetch_with_fetch(transport
, nr_heads
, to_fetch
);
574 return fetch_with_import(transport
, nr_heads
, to_fetch
);
579 static void push_update_ref_status(struct strbuf
*buf
,
581 struct ref
*remote_refs
)
586 if (!prefixcmp(buf
->buf
, "ok ")) {
587 status
= REF_STATUS_OK
;
588 refname
= buf
->buf
+ 3;
589 } else if (!prefixcmp(buf
->buf
, "error ")) {
590 status
= REF_STATUS_REMOTE_REJECT
;
591 refname
= buf
->buf
+ 6;
593 die("expected ok/error, helper said '%s'\n", buf
->buf
);
595 msg
= strchr(refname
, ' ');
597 struct strbuf msg_buf
= STRBUF_INIT
;
601 if (!unquote_c_style(&msg_buf
, msg
, &end
))
602 msg
= strbuf_detach(&msg_buf
, NULL
);
605 strbuf_release(&msg_buf
);
607 if (!strcmp(msg
, "no match")) {
608 status
= REF_STATUS_NONE
;
612 else if (!strcmp(msg
, "up to date")) {
613 status
= REF_STATUS_UPTODATE
;
617 else if (!strcmp(msg
, "non-fast forward")) {
618 status
= REF_STATUS_REJECT_NONFASTFORWARD
;
625 *ref
= find_ref_by_name(*ref
, refname
);
627 *ref
= find_ref_by_name(remote_refs
, refname
);
629 warning("helper reported unexpected status of %s", refname
);
633 if ((*ref
)->status
!= REF_STATUS_NONE
) {
635 * Earlier, the ref was marked not to be pushed, so ignore the ref
636 * status reported by the remote helper if the latter is 'no match'.
638 if (status
== REF_STATUS_NONE
)
642 (*ref
)->status
= status
;
643 (*ref
)->remote_status
= msg
;
646 static void push_update_refs_status(struct helper_data
*data
,
647 struct ref
*remote_refs
)
649 struct strbuf buf
= STRBUF_INIT
;
650 struct ref
*ref
= remote_refs
;
652 recvline(data
, &buf
);
656 push_update_ref_status(&buf
, &ref
, remote_refs
);
658 strbuf_release(&buf
);
661 static int push_refs_with_push(struct transport
*transport
,
662 struct ref
*remote_refs
, int flags
)
664 int force_all
= flags
& TRANSPORT_PUSH_FORCE
;
665 int mirror
= flags
& TRANSPORT_PUSH_MIRROR
;
666 struct helper_data
*data
= transport
->data
;
667 struct strbuf buf
= STRBUF_INIT
;
670 get_helper(transport
);
674 for (ref
= remote_refs
; ref
; ref
= ref
->next
) {
675 if (!ref
->peer_ref
&& !mirror
)
678 /* Check for statuses set by set_ref_status_for_push() */
679 switch (ref
->status
) {
680 case REF_STATUS_REJECT_NONFASTFORWARD
:
681 case REF_STATUS_UPTODATE
:
690 strbuf_addstr(&buf
, "push ");
691 if (!ref
->deletion
) {
693 strbuf_addch(&buf
, '+');
695 strbuf_addstr(&buf
, ref
->peer_ref
->name
);
697 strbuf_addstr(&buf
, sha1_to_hex(ref
->new_sha1
));
699 strbuf_addch(&buf
, ':');
700 strbuf_addstr(&buf
, ref
->name
);
701 strbuf_addch(&buf
, '\n');
706 standard_options(transport
);
708 if (flags
& TRANSPORT_PUSH_DRY_RUN
) {
709 if (set_helper_option(transport
, "dry-run", "true") != 0)
710 die("helper %s does not support dry-run", data
->name
);
713 strbuf_addch(&buf
, '\n');
714 sendline(data
, &buf
);
715 strbuf_release(&buf
);
717 push_update_refs_status(data
, remote_refs
);
721 static int push_refs_with_export(struct transport
*transport
,
722 struct ref
*remote_refs
, int flags
)
725 struct child_process
*helper
, exporter
;
726 struct helper_data
*data
= transport
->data
;
727 struct string_list revlist_args
= STRING_LIST_INIT_NODUP
;
728 struct strbuf buf
= STRBUF_INIT
;
730 helper
= get_helper(transport
);
732 write_constant(helper
->in
, "export\n");
736 for (ref
= remote_refs
; ref
; ref
= ref
->next
) {
738 unsigned char sha1
[20];
742 private = apply_refspecs(data
->refspecs
, data
->refspec_nr
, ref
->name
);
743 if (private && !get_sha1(private, sha1
)) {
744 strbuf_addf(&buf
, "^%s", private);
745 string_list_append(&revlist_args
, strbuf_detach(&buf
, NULL
));
750 string_list_append(&revlist_args
, ref
->peer_ref
->name
);
754 if (get_exporter(transport
, &exporter
, &revlist_args
))
755 die("Couldn't run fast-export");
757 if (finish_command(&exporter
))
758 die("Error while running fast-export");
759 push_update_refs_status(data
, remote_refs
);
763 static int push_refs(struct transport
*transport
,
764 struct ref
*remote_refs
, int flags
)
766 struct helper_data
*data
= transport
->data
;
768 if (process_connect(transport
, 1)) {
769 do_take_over(transport
);
770 return transport
->push_refs(transport
, remote_refs
, flags
);
774 fprintf(stderr
, "No refs in common and none specified; doing nothing.\n"
775 "Perhaps you should specify a branch such as 'master'.\n");
780 return push_refs_with_push(transport
, remote_refs
, flags
);
783 return push_refs_with_export(transport
, remote_refs
, flags
);
789 static int has_attribute(const char *attrs
, const char *attr
) {
796 const char *space
= strchrnul(attrs
, ' ');
797 if (len
== space
- attrs
&& !strncmp(attrs
, attr
, len
))
805 static struct ref
*get_refs_list(struct transport
*transport
, int for_push
)
807 struct helper_data
*data
= transport
->data
;
808 struct child_process
*helper
;
809 struct ref
*ret
= NULL
;
810 struct ref
**tail
= &ret
;
812 struct strbuf buf
= STRBUF_INIT
;
814 helper
= get_helper(transport
);
816 if (process_connect(transport
, for_push
)) {
817 do_take_over(transport
);
818 return transport
->get_refs_list(transport
, for_push
);
821 if (data
->push
&& for_push
)
822 write_str_in_full(helper
->in
, "list for-push\n");
824 write_str_in_full(helper
->in
, "list\n");
828 recvline(data
, &buf
);
833 eov
= strchr(buf
.buf
, ' ');
835 die("Malformed response in ref list: %s", buf
.buf
);
836 eon
= strchr(eov
+ 1, ' ');
840 *tail
= alloc_ref(eov
+ 1);
841 if (buf
.buf
[0] == '@')
842 (*tail
)->symref
= xstrdup(buf
.buf
+ 1);
843 else if (buf
.buf
[0] != '?')
844 get_sha1_hex(buf
.buf
, (*tail
)->old_sha1
);
846 if (has_attribute(eon
+ 1, "unchanged")) {
847 (*tail
)->status
|= REF_STATUS_UPTODATE
;
848 read_ref((*tail
)->name
, (*tail
)->old_sha1
);
851 tail
= &((*tail
)->next
);
854 fprintf(stderr
, "Debug: Read ref listing.\n");
855 strbuf_release(&buf
);
857 for (posn
= ret
; posn
; posn
= posn
->next
)
858 resolve_remote_symref(posn
, ret
);
863 int transport_helper_init(struct transport
*transport
, const char *name
)
865 struct helper_data
*data
= xcalloc(sizeof(*data
), 1);
868 if (getenv("GIT_TRANSPORT_HELPER_DEBUG"))
871 transport
->data
= data
;
872 transport
->set_option
= set_helper_option
;
873 transport
->get_refs_list
= get_refs_list
;
874 transport
->fetch
= fetch
;
875 transport
->push_refs
= push_refs
;
876 transport
->disconnect
= release_helper
;
877 transport
->connect
= connect_helper
;
878 transport
->smart_options
= &(data
->transport_options
);
883 * Linux pipes can buffer 65536 bytes at once (and most platforms can
884 * buffer less), so attempt reads and writes with up to that size.
886 #define BUFFERSIZE 65536
887 /* This should be enough to hold debugging message. */
888 #define PBUFFERSIZE 8192
890 /* Print bidirectional transfer loop debug message. */
891 static void transfer_debug(const char *fmt
, ...)
894 char msgbuf
[PBUFFERSIZE
];
895 static int debug_enabled
= -1;
897 if (debug_enabled
< 0)
898 debug_enabled
= getenv("GIT_TRANSLOOP_DEBUG") ? 1 : 0;
903 vsnprintf(msgbuf
, PBUFFERSIZE
, fmt
, args
);
905 fprintf(stderr
, "Transfer loop debugging: %s\n", msgbuf
);
908 /* Stream state: More data may be coming in this direction. */
909 #define SSTATE_TRANSFERING 0
911 * Stream state: No more data coming in this direction, flushing rest of
914 #define SSTATE_FLUSHING 1
915 /* Stream state: Transfer in this direction finished. */
916 #define SSTATE_FINISHED 2
918 #define STATE_NEEDS_READING(state) ((state) <= SSTATE_TRANSFERING)
919 #define STATE_NEEDS_WRITING(state) ((state) <= SSTATE_FLUSHING)
920 #define STATE_NEEDS_CLOSING(state) ((state) == SSTATE_FLUSHING)
922 /* Unidirectional transfer. */
923 struct unidirectional_transfer
{
928 /* Is source socket? */
930 /* Is destination socket? */
932 /* Transfer state (TRANSFERING/FLUSHING/FINISHED) */
935 char buf
[BUFFERSIZE
];
938 /* Name of source. */
939 const char *src_name
;
940 /* Name of destination. */
941 const char *dest_name
;
944 /* Closes the target (for writing) if transfer has finished. */
945 static void udt_close_if_finished(struct unidirectional_transfer
*t
)
947 if (STATE_NEEDS_CLOSING(t
->state
) && !t
->bufuse
) {
948 t
->state
= SSTATE_FINISHED
;
950 shutdown(t
->dest
, SHUT_WR
);
953 transfer_debug("Closed %s.", t
->dest_name
);
958 * Tries to read read data from source into buffer. If buffer is full,
959 * no data is read. Returns 0 on success, -1 on error.
961 static int udt_do_read(struct unidirectional_transfer
*t
)
965 if (t
->bufuse
== BUFFERSIZE
)
966 return 0; /* No space for more. */
968 transfer_debug("%s is readable", t
->src_name
);
969 bytes
= read(t
->src
, t
->buf
+ t
->bufuse
, BUFFERSIZE
- t
->bufuse
);
970 if (bytes
< 0 && errno
!= EWOULDBLOCK
&& errno
!= EAGAIN
&&
972 error("read(%s) failed: %s", t
->src_name
, strerror(errno
));
974 } else if (bytes
== 0) {
975 transfer_debug("%s EOF (with %i bytes in buffer)",
976 t
->src_name
, t
->bufuse
);
977 t
->state
= SSTATE_FLUSHING
;
978 } else if (bytes
> 0) {
980 transfer_debug("Read %i bytes from %s (buffer now at %i)",
981 (int)bytes
, t
->src_name
, (int)t
->bufuse
);
986 /* Tries to write data from buffer into destination. If buffer is empty,
987 * no data is written. Returns 0 on success, -1 on error.
989 static int udt_do_write(struct unidirectional_transfer
*t
)
994 return 0; /* Nothing to write. */
996 transfer_debug("%s is writable", t
->dest_name
);
997 bytes
= write(t
->dest
, t
->buf
, t
->bufuse
);
998 if (bytes
< 0 && errno
!= EWOULDBLOCK
&& errno
!= EAGAIN
&&
1000 error("write(%s) failed: %s", t
->dest_name
, strerror(errno
));
1002 } else if (bytes
> 0) {
1005 memmove(t
->buf
, t
->buf
+ bytes
, t
->bufuse
);
1006 transfer_debug("Wrote %i bytes to %s (buffer now at %i)",
1007 (int)bytes
, t
->dest_name
, (int)t
->bufuse
);
1013 /* State of bidirectional transfer loop. */
1014 struct bidirectional_transfer_state
{
1015 /* Direction from program to git. */
1016 struct unidirectional_transfer ptg
;
1017 /* Direction from git to program. */
1018 struct unidirectional_transfer gtp
;
1021 static void *udt_copy_task_routine(void *udt
)
1023 struct unidirectional_transfer
*t
= (struct unidirectional_transfer
*)udt
;
1024 while (t
->state
!= SSTATE_FINISHED
) {
1025 if (STATE_NEEDS_READING(t
->state
))
1028 if (STATE_NEEDS_WRITING(t
->state
))
1029 if (udt_do_write(t
))
1031 if (STATE_NEEDS_CLOSING(t
->state
))
1032 udt_close_if_finished(t
);
1034 return udt
; /* Just some non-NULL value. */
1040 * Join thread, with apporiate errors on failure. Name is name for the
1041 * thread (for error messages). Returns 0 on success, 1 on failure.
1043 static int tloop_join(pthread_t thread
, const char *name
)
1047 err
= pthread_join(thread
, &tret
);
1049 error("%s thread failed", name
);
1053 error("%s thread failed to join: %s", name
, strerror(err
));
1060 * Spawn the transfer tasks and then wait for them. Returns 0 on success,
1063 static int tloop_spawnwait_tasks(struct bidirectional_transfer_state
*s
)
1065 pthread_t gtp_thread
;
1066 pthread_t ptg_thread
;
1069 err
= pthread_create(>p_thread
, NULL
, udt_copy_task_routine
,
1072 die("Can't start thread for copying data: %s", strerror(err
));
1073 err
= pthread_create(&ptg_thread
, NULL
, udt_copy_task_routine
,
1076 die("Can't start thread for copying data: %s", strerror(err
));
1078 ret
|= tloop_join(gtp_thread
, "Git to program copy");
1079 ret
|= tloop_join(ptg_thread
, "Program to git copy");
1084 /* Close the source and target (for writing) for transfer. */
1085 static void udt_kill_transfer(struct unidirectional_transfer
*t
)
1087 t
->state
= SSTATE_FINISHED
;
1089 * Socket read end left open isn't a disaster if nobody
1090 * attempts to read from it (mingw compat headers do not
1093 * We can't fully close the socket since otherwise gtp
1094 * task would first close the socket it sends data to
1095 * while closing the ptg file descriptors.
1097 if (!t
->src_is_sock
)
1099 if (t
->dest_is_sock
)
1100 shutdown(t
->dest
, SHUT_WR
);
1106 * Join process, with apporiate errors on failure. Name is name for the
1107 * process (for error messages). Returns 0 on success, 1 on failure.
1109 static int tloop_join(pid_t pid
, const char *name
)
1112 if (waitpid(pid
, &tret
, 0) < 0) {
1113 error("%s process failed to wait: %s", name
, strerror(errno
));
1116 if (!WIFEXITED(tret
) || WEXITSTATUS(tret
)) {
1117 error("%s process failed", name
);
1124 * Spawn the transfer tasks and then wait for them. Returns 0 on success,
1127 static int tloop_spawnwait_tasks(struct bidirectional_transfer_state
*s
)
1132 /* Fork thread #1: git to program. */
1135 die_errno("Can't start thread for copying data");
1136 else if (pid1
== 0) {
1137 udt_kill_transfer(&s
->ptg
);
1138 exit(udt_copy_task_routine(&s
->gtp
) ? 0 : 1);
1141 /* Fork thread #2: program to git. */
1144 die_errno("Can't start thread for copying data");
1145 else if (pid2
== 0) {
1146 udt_kill_transfer(&s
->gtp
);
1147 exit(udt_copy_task_routine(&s
->ptg
) ? 0 : 1);
1151 * Close both streams in parent as to not interfere with
1152 * end of file detection and wait for both tasks to finish.
1154 udt_kill_transfer(&s
->gtp
);
1155 udt_kill_transfer(&s
->ptg
);
1156 ret
|= tloop_join(pid1
, "Git to program copy");
1157 ret
|= tloop_join(pid2
, "Program to git copy");
1163 * Copies data from stdin to output and from input to stdout simultaneously.
1164 * Additionally filtering through given filter. If filter is NULL, uses
1167 int bidirectional_transfer_loop(int input
, int output
)
1169 struct bidirectional_transfer_state state
;
1171 /* Fill the state fields. */
1172 state
.ptg
.src
= input
;
1174 state
.ptg
.src_is_sock
= (input
== output
);
1175 state
.ptg
.dest_is_sock
= 0;
1176 state
.ptg
.state
= SSTATE_TRANSFERING
;
1177 state
.ptg
.bufuse
= 0;
1178 state
.ptg
.src_name
= "remote input";
1179 state
.ptg
.dest_name
= "stdout";
1182 state
.gtp
.dest
= output
;
1183 state
.gtp
.src_is_sock
= 0;
1184 state
.gtp
.dest_is_sock
= (input
== output
);
1185 state
.gtp
.state
= SSTATE_TRANSFERING
;
1186 state
.gtp
.bufuse
= 0;
1187 state
.gtp
.src_name
= "stdin";
1188 state
.gtp
.dest_name
= "remote output";
1190 return tloop_spawnwait_tasks(&state
);