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;
26 /* These go from remote name (as in "list") to private name */
27 struct refspec
*refspecs
;
29 /* Transport options for fetch-pack/send-pack (should one of
32 struct git_transport_options transport_options
;
35 static void sendline(struct helper_data
*helper
, struct strbuf
*buffer
)
38 fprintf(stderr
, "Debug: Remote helper: -> %s", buffer
->buf
);
39 if (write_in_full(helper
->helper
->in
, buffer
->buf
, buffer
->len
)
41 die_errno("Full write to remote helper failed");
44 static int recvline_fh(FILE *helper
, struct strbuf
*buffer
)
48 fprintf(stderr
, "Debug: Remote helper: Waiting...\n");
49 if (strbuf_getline(buffer
, helper
, '\n') == EOF
) {
51 fprintf(stderr
, "Debug: Remote helper quit.\n");
56 fprintf(stderr
, "Debug: Remote helper: <- %s\n", buffer
->buf
);
60 static int recvline(struct helper_data
*helper
, struct strbuf
*buffer
)
62 return recvline_fh(helper
->out
, buffer
);
65 static void xchgline(struct helper_data
*helper
, struct strbuf
*buffer
)
67 sendline(helper
, buffer
);
68 recvline(helper
, buffer
);
71 static void write_constant(int fd
, const char *str
)
74 fprintf(stderr
, "Debug: Remote helper: -> %s", str
);
75 if (write_in_full(fd
, str
, strlen(str
)) != strlen(str
))
76 die_errno("Full write to remote helper failed");
79 static const char *remove_ext_force(const char *url
)
82 const char *colon
= strchr(url
, ':');
83 if (colon
&& colon
[1] == ':')
89 static void do_take_over(struct transport
*transport
)
91 struct helper_data
*data
;
92 data
= (struct helper_data
*)transport
->data
;
93 transport_take_over(transport
, data
->helper
);
98 static struct child_process
*get_helper(struct transport
*transport
)
100 struct helper_data
*data
= transport
->data
;
101 struct strbuf buf
= STRBUF_INIT
;
102 struct child_process
*helper
;
103 const char **refspecs
= NULL
;
105 int refspec_alloc
= 0;
108 char git_dir_buf
[sizeof(GIT_DIR_ENVIRONMENT
) + PATH_MAX
+ 1];
109 const char *helper_env
[] = {
118 helper
= xcalloc(1, sizeof(*helper
));
122 helper
->argv
= xcalloc(4, sizeof(*helper
->argv
));
123 strbuf_addf(&buf
, "git-remote-%s", data
->name
);
124 helper
->argv
[0] = strbuf_detach(&buf
, NULL
);
125 helper
->argv
[1] = transport
->remote
->name
;
126 helper
->argv
[2] = remove_ext_force(transport
->url
);
128 helper
->silent_exec_failure
= 1;
130 snprintf(git_dir_buf
, sizeof(git_dir_buf
), "%s=%s", GIT_DIR_ENVIRONMENT
, get_git_dir());
131 helper
->env
= helper_env
;
133 code
= start_command(helper
);
134 if (code
< 0 && errno
== ENOENT
)
135 die("Unable to find remote helper for '%s'", data
->name
);
139 data
->helper
= helper
;
140 data
->no_disconnect_req
= 0;
143 * Open the output as FILE* so strbuf_getline() can be used.
144 * Do this with duped fd because fclose() will close the fd,
145 * and stuff like taking over will require the fd to remain.
147 duped
= dup(helper
->out
);
149 die_errno("Can't dup helper output fd");
150 data
->out
= xfdopen(duped
, "r");
152 write_constant(helper
->in
, "capabilities\n");
157 recvline(data
, &buf
);
162 if (*buf
.buf
== '*') {
163 capname
= buf
.buf
+ 1;
169 fprintf(stderr
, "Debug: Got cap %s\n", capname
);
170 if (!strcmp(capname
, "fetch"))
172 else if (!strcmp(capname
, "option"))
174 else if (!strcmp(capname
, "push"))
176 else if (!strcmp(capname
, "import"))
178 else if (!strcmp(capname
, "export"))
180 else if (!data
->refspecs
&& !prefixcmp(capname
, "refspec ")) {
184 refspecs
[refspec_nr
++] = strdup(buf
.buf
+ strlen("refspec "));
185 } else if (!strcmp(capname
, "connect")) {
187 } else if (mandatory
) {
188 die("Unknown mandatory capability %s. This remote "
189 "helper probably needs newer version of Git.\n",
195 data
->refspec_nr
= refspec_nr
;
196 data
->refspecs
= parse_fetch_refspec(refspec_nr
, refspecs
);
197 for (i
= 0; i
< refspec_nr
; i
++) {
198 free((char *)refspecs
[i
]);
202 strbuf_release(&buf
);
204 fprintf(stderr
, "Debug: Capabilities complete.\n");
208 static int disconnect_helper(struct transport
*transport
)
210 struct helper_data
*data
= transport
->data
;
211 struct strbuf buf
= STRBUF_INIT
;
215 fprintf(stderr
, "Debug: Disconnecting.\n");
216 if (!data
->no_disconnect_req
) {
217 strbuf_addf(&buf
, "\n");
218 sendline(data
, &buf
);
220 close(data
->helper
->in
);
221 close(data
->helper
->out
);
223 finish_command(data
->helper
);
224 free((char *)data
->helper
->argv
[0]);
225 free(data
->helper
->argv
);
232 static const char *unsupported_options
[] = {
233 TRANS_OPT_UPLOADPACK
,
234 TRANS_OPT_RECEIVEPACK
,
238 static const char *boolean_options
[] = {
244 static int set_helper_option(struct transport
*transport
,
245 const char *name
, const char *value
)
247 struct helper_data
*data
= transport
->data
;
248 struct strbuf buf
= STRBUF_INIT
;
249 int i
, ret
, is_bool
= 0;
251 get_helper(transport
);
256 for (i
= 0; i
< ARRAY_SIZE(unsupported_options
); i
++) {
257 if (!strcmp(name
, unsupported_options
[i
]))
261 for (i
= 0; i
< ARRAY_SIZE(boolean_options
); i
++) {
262 if (!strcmp(name
, boolean_options
[i
])) {
268 strbuf_addf(&buf
, "option %s ", name
);
270 strbuf_addstr(&buf
, value
? "true" : "false");
272 quote_c_style(value
, &buf
, NULL
, 0);
273 strbuf_addch(&buf
, '\n');
275 xchgline(data
, &buf
);
277 if (!strcmp(buf
.buf
, "ok"))
279 else if (!prefixcmp(buf
.buf
, "error")) {
281 } else if (!strcmp(buf
.buf
, "unsupported"))
284 warning("%s unexpectedly said: '%s'", data
->name
, buf
.buf
);
287 strbuf_release(&buf
);
291 static void standard_options(struct transport
*t
)
297 set_helper_option(t
, "progress", t
->progress
? "true" : "false");
299 n
= snprintf(buf
, sizeof(buf
), "%d", v
+ 1);
300 if (n
>= sizeof(buf
))
301 die("impossibly large verbosity value");
302 set_helper_option(t
, "verbosity", buf
);
305 static int release_helper(struct transport
*transport
)
307 struct helper_data
*data
= transport
->data
;
308 free_refspec(data
->refspec_nr
, data
->refspecs
);
309 data
->refspecs
= NULL
;
310 disconnect_helper(transport
);
311 free(transport
->data
);
315 static int fetch_with_fetch(struct transport
*transport
,
316 int nr_heads
, struct ref
**to_fetch
)
318 struct helper_data
*data
= transport
->data
;
320 struct strbuf buf
= STRBUF_INIT
;
322 standard_options(transport
);
324 for (i
= 0; i
< nr_heads
; i
++) {
325 const struct ref
*posn
= to_fetch
[i
];
326 if (posn
->status
& REF_STATUS_UPTODATE
)
329 strbuf_addf(&buf
, "fetch %s %s\n",
330 sha1_to_hex(posn
->old_sha1
), posn
->name
);
333 strbuf_addch(&buf
, '\n');
334 sendline(data
, &buf
);
337 recvline(data
, &buf
);
339 if (!prefixcmp(buf
.buf
, "lock ")) {
340 const char *name
= buf
.buf
+ 5;
341 if (transport
->pack_lockfile
)
342 warning("%s also locked %s", data
->name
, name
);
344 transport
->pack_lockfile
= xstrdup(name
);
349 warning("%s unexpectedly said: '%s'", data
->name
, buf
.buf
);
351 strbuf_release(&buf
);
355 static int get_importer(struct transport
*transport
, struct child_process
*fastimport
)
357 struct child_process
*helper
= get_helper(transport
);
358 memset(fastimport
, 0, sizeof(*fastimport
));
359 fastimport
->in
= helper
->out
;
360 fastimport
->argv
= xcalloc(5, sizeof(*fastimport
->argv
));
361 fastimport
->argv
[0] = "fast-import";
362 fastimport
->argv
[1] = "--quiet";
364 fastimport
->git_cmd
= 1;
365 return start_command(fastimport
);
368 static int get_exporter(struct transport
*transport
,
369 struct child_process
*fastexport
,
370 const char *export_marks
,
371 const char *import_marks
,
372 struct string_list
*revlist_args
)
374 struct child_process
*helper
= get_helper(transport
);
376 memset(fastexport
, 0, sizeof(*fastexport
));
378 /* we need to duplicate helper->in because we want to use it after
379 * fastexport is done with it. */
380 fastexport
->out
= dup(helper
->in
);
381 fastexport
->argv
= xcalloc(4 + revlist_args
->nr
, sizeof(*fastexport
->argv
));
382 fastexport
->argv
[argc
++] = "fast-export";
384 fastexport
->argv
[argc
++] = export_marks
;
386 fastexport
->argv
[argc
++] = import_marks
;
388 for (i
= 0; i
< revlist_args
->nr
; i
++)
389 fastexport
->argv
[argc
++] = revlist_args
->items
[i
].string
;
391 fastexport
->git_cmd
= 1;
392 return start_command(fastexport
);
395 static int fetch_with_import(struct transport
*transport
,
396 int nr_heads
, struct ref
**to_fetch
)
398 struct child_process fastimport
;
399 struct helper_data
*data
= transport
->data
;
402 struct strbuf buf
= STRBUF_INIT
;
404 get_helper(transport
);
406 if (get_importer(transport
, &fastimport
))
407 die("Couldn't run fast-import");
409 for (i
= 0; i
< nr_heads
; i
++) {
411 if (posn
->status
& REF_STATUS_UPTODATE
)
414 strbuf_addf(&buf
, "import %s\n", posn
->name
);
415 sendline(data
, &buf
);
418 disconnect_helper(transport
);
419 finish_command(&fastimport
);
420 free(fastimport
.argv
);
421 fastimport
.argv
= NULL
;
423 for (i
= 0; i
< nr_heads
; i
++) {
426 if (posn
->status
& REF_STATUS_UPTODATE
)
429 private = apply_refspecs(data
->refspecs
, data
->refspec_nr
, posn
->name
);
431 private = strdup(posn
->name
);
432 read_ref(private, posn
->old_sha1
);
435 strbuf_release(&buf
);
439 static int process_connect_service(struct transport
*transport
,
440 const char *name
, const char *exec
)
442 struct helper_data
*data
= transport
->data
;
443 struct strbuf cmdbuf
= STRBUF_INIT
;
444 struct child_process
*helper
;
445 int r
, duped
, ret
= 0;
448 helper
= get_helper(transport
);
451 * Yes, dup the pipe another time, as we need unbuffered version
452 * of input pipe as FILE*. fclose() closes the underlying fd and
453 * stream buffering only can be changed before first I/O operation
456 duped
= dup(helper
->out
);
458 die_errno("Can't dup helper output fd");
459 input
= xfdopen(duped
, "r");
460 setvbuf(input
, NULL
, _IONBF
, 0);
463 * Handle --upload-pack and friends. This is fire and forget...
464 * just warn if it fails.
466 if (strcmp(name
, exec
)) {
467 r
= set_helper_option(transport
, "servpath", exec
);
469 warning("Setting remote service path not supported by protocol.");
471 warning("Invalid remote service path.");
475 strbuf_addf(&cmdbuf
, "connect %s\n", name
);
479 sendline(data
, &cmdbuf
);
480 recvline_fh(input
, &cmdbuf
);
481 if (!strcmp(cmdbuf
.buf
, "")) {
482 data
->no_disconnect_req
= 1;
484 fprintf(stderr
, "Debug: Smart transport connection "
487 } else if (!strcmp(cmdbuf
.buf
, "fallback")) {
489 fprintf(stderr
, "Debug: Falling back to dumb "
492 die("Unknown response to connect: %s",
500 static int process_connect(struct transport
*transport
,
503 struct helper_data
*data
= transport
->data
;
507 name
= for_push
? "git-receive-pack" : "git-upload-pack";
509 exec
= data
->transport_options
.receivepack
;
511 exec
= data
->transport_options
.uploadpack
;
513 return process_connect_service(transport
, name
, exec
);
516 static int connect_helper(struct transport
*transport
, const char *name
,
517 const char *exec
, int fd
[2])
519 struct helper_data
*data
= transport
->data
;
521 /* Get_helper so connect is inited. */
522 get_helper(transport
);
524 die("Operation not supported by protocol.");
526 if (!process_connect_service(transport
, name
, exec
))
527 die("Can't connect to subservice %s.", name
);
529 fd
[0] = data
->helper
->out
;
530 fd
[1] = data
->helper
->in
;
534 static int fetch(struct transport
*transport
,
535 int nr_heads
, struct ref
**to_fetch
)
537 struct helper_data
*data
= transport
->data
;
540 if (process_connect(transport
, 0)) {
541 do_take_over(transport
);
542 return transport
->fetch(transport
, nr_heads
, to_fetch
);
546 for (i
= 0; i
< nr_heads
; i
++)
547 if (!(to_fetch
[i
]->status
& REF_STATUS_UPTODATE
))
554 return fetch_with_fetch(transport
, nr_heads
, to_fetch
);
557 return fetch_with_import(transport
, nr_heads
, to_fetch
);
562 static void push_update_ref_status(struct strbuf
*buf
,
564 struct ref
*remote_refs
)
569 if (!prefixcmp(buf
->buf
, "ok ")) {
570 status
= REF_STATUS_OK
;
571 refname
= buf
->buf
+ 3;
572 } else if (!prefixcmp(buf
->buf
, "error ")) {
573 status
= REF_STATUS_REMOTE_REJECT
;
574 refname
= buf
->buf
+ 6;
576 die("expected ok/error, helper said '%s'\n", buf
->buf
);
578 msg
= strchr(refname
, ' ');
580 struct strbuf msg_buf
= STRBUF_INIT
;
584 if (!unquote_c_style(&msg_buf
, msg
, &end
))
585 msg
= strbuf_detach(&msg_buf
, NULL
);
588 strbuf_release(&msg_buf
);
590 if (!strcmp(msg
, "no match")) {
591 status
= REF_STATUS_NONE
;
595 else if (!strcmp(msg
, "up to date")) {
596 status
= REF_STATUS_UPTODATE
;
600 else if (!strcmp(msg
, "non-fast forward")) {
601 status
= REF_STATUS_REJECT_NONFASTFORWARD
;
608 *ref
= find_ref_by_name(*ref
, refname
);
610 *ref
= find_ref_by_name(remote_refs
, refname
);
612 warning("helper reported unexpected status of %s", refname
);
616 if ((*ref
)->status
!= REF_STATUS_NONE
) {
618 * Earlier, the ref was marked not to be pushed, so ignore the ref
619 * status reported by the remote helper if the latter is 'no match'.
621 if (status
== REF_STATUS_NONE
)
625 (*ref
)->status
= status
;
626 (*ref
)->remote_status
= msg
;
629 static void push_update_refs_status(struct helper_data
*data
,
630 struct ref
*remote_refs
)
632 struct strbuf buf
= STRBUF_INIT
;
633 struct ref
*ref
= remote_refs
;
635 recvline(data
, &buf
);
639 push_update_ref_status(&buf
, &ref
, remote_refs
);
641 strbuf_release(&buf
);
644 static int push_refs_with_push(struct transport
*transport
,
645 struct ref
*remote_refs
, int flags
)
647 int force_all
= flags
& TRANSPORT_PUSH_FORCE
;
648 int mirror
= flags
& TRANSPORT_PUSH_MIRROR
;
649 struct helper_data
*data
= transport
->data
;
650 struct strbuf buf
= STRBUF_INIT
;
653 get_helper(transport
);
657 for (ref
= remote_refs
; ref
; ref
= ref
->next
) {
658 if (!ref
->peer_ref
&& !mirror
)
661 /* Check for statuses set by set_ref_status_for_push() */
662 switch (ref
->status
) {
663 case REF_STATUS_REJECT_NONFASTFORWARD
:
664 case REF_STATUS_UPTODATE
:
673 strbuf_addstr(&buf
, "push ");
674 if (!ref
->deletion
) {
676 strbuf_addch(&buf
, '+');
678 strbuf_addstr(&buf
, ref
->peer_ref
->name
);
680 strbuf_addstr(&buf
, sha1_to_hex(ref
->new_sha1
));
682 strbuf_addch(&buf
, ':');
683 strbuf_addstr(&buf
, ref
->name
);
684 strbuf_addch(&buf
, '\n');
689 standard_options(transport
);
691 if (flags
& TRANSPORT_PUSH_DRY_RUN
) {
692 if (set_helper_option(transport
, "dry-run", "true") != 0)
693 die("helper %s does not support dry-run", data
->name
);
696 strbuf_addch(&buf
, '\n');
697 sendline(data
, &buf
);
698 strbuf_release(&buf
);
700 push_update_refs_status(data
, remote_refs
);
704 static int push_refs_with_export(struct transport
*transport
,
705 struct ref
*remote_refs
, int flags
)
708 struct child_process
*helper
, exporter
;
709 struct helper_data
*data
= transport
->data
;
710 char *export_marks
= NULL
, *import_marks
= NULL
;
711 struct string_list revlist_args
= STRING_LIST_INIT_NODUP
;
712 struct strbuf buf
= STRBUF_INIT
;
714 helper
= get_helper(transport
);
716 write_constant(helper
->in
, "export\n");
718 recvline(data
, &buf
);
720 fprintf(stderr
, "Debug: Got export_marks '%s'\n", buf
.buf
);
722 struct strbuf arg
= STRBUF_INIT
;
723 strbuf_addstr(&arg
, "--export-marks=");
724 strbuf_addbuf(&arg
, &buf
);
725 export_marks
= strbuf_detach(&arg
, NULL
);
728 recvline(data
, &buf
);
730 fprintf(stderr
, "Debug: Got import_marks '%s'\n", buf
.buf
);
732 struct strbuf arg
= STRBUF_INIT
;
733 strbuf_addstr(&arg
, "--import-marks=");
734 strbuf_addbuf(&arg
, &buf
);
735 import_marks
= strbuf_detach(&arg
, NULL
);
740 for (ref
= remote_refs
; ref
; ref
= ref
->next
) {
742 unsigned char sha1
[20];
746 private = apply_refspecs(data
->refspecs
, data
->refspec_nr
, ref
->name
);
747 if (private && !get_sha1(private, sha1
)) {
748 strbuf_addf(&buf
, "^%s", private);
749 string_list_append(&revlist_args
, strbuf_detach(&buf
, NULL
));
754 string_list_append(&revlist_args
, ref
->peer_ref
->name
);
758 if (get_exporter(transport
, &exporter
,
759 export_marks
, import_marks
, &revlist_args
))
760 die("Couldn't run fast-export");
762 data
->no_disconnect_req
= 1;
763 finish_command(&exporter
);
764 disconnect_helper(transport
);
768 static int push_refs(struct transport
*transport
,
769 struct ref
*remote_refs
, int flags
)
771 struct helper_data
*data
= transport
->data
;
773 if (process_connect(transport
, 1)) {
774 do_take_over(transport
);
775 return transport
->push_refs(transport
, remote_refs
, flags
);
779 fprintf(stderr
, "No refs in common and none specified; doing nothing.\n"
780 "Perhaps you should specify a branch such as 'master'.\n");
785 return push_refs_with_push(transport
, remote_refs
, flags
);
788 return push_refs_with_export(transport
, remote_refs
, flags
);
794 static int has_attribute(const char *attrs
, const char *attr
) {
801 const char *space
= strchrnul(attrs
, ' ');
802 if (len
== space
- attrs
&& !strncmp(attrs
, attr
, len
))
810 static struct ref
*get_refs_list(struct transport
*transport
, int for_push
)
812 struct helper_data
*data
= transport
->data
;
813 struct child_process
*helper
;
814 struct ref
*ret
= NULL
;
815 struct ref
**tail
= &ret
;
817 struct strbuf buf
= STRBUF_INIT
;
819 helper
= get_helper(transport
);
821 if (process_connect(transport
, for_push
)) {
822 do_take_over(transport
);
823 return transport
->get_refs_list(transport
, for_push
);
826 if (data
->push
&& for_push
)
827 write_str_in_full(helper
->in
, "list for-push\n");
829 write_str_in_full(helper
->in
, "list\n");
833 recvline(data
, &buf
);
838 eov
= strchr(buf
.buf
, ' ');
840 die("Malformed response in ref list: %s", buf
.buf
);
841 eon
= strchr(eov
+ 1, ' ');
845 *tail
= alloc_ref(eov
+ 1);
846 if (buf
.buf
[0] == '@')
847 (*tail
)->symref
= xstrdup(buf
.buf
+ 1);
848 else if (buf
.buf
[0] != '?')
849 get_sha1_hex(buf
.buf
, (*tail
)->old_sha1
);
851 if (has_attribute(eon
+ 1, "unchanged")) {
852 (*tail
)->status
|= REF_STATUS_UPTODATE
;
853 read_ref((*tail
)->name
, (*tail
)->old_sha1
);
856 tail
= &((*tail
)->next
);
859 fprintf(stderr
, "Debug: Read ref listing.\n");
860 strbuf_release(&buf
);
862 for (posn
= ret
; posn
; posn
= posn
->next
)
863 resolve_remote_symref(posn
, ret
);
868 int transport_helper_init(struct transport
*transport
, const char *name
)
870 struct helper_data
*data
= xcalloc(sizeof(*data
), 1);
873 if (getenv("GIT_TRANSPORT_HELPER_DEBUG"))
876 transport
->data
= data
;
877 transport
->set_option
= set_helper_option
;
878 transport
->get_refs_list
= get_refs_list
;
879 transport
->fetch
= fetch
;
880 transport
->push_refs
= push_refs
;
881 transport
->disconnect
= release_helper
;
882 transport
->connect
= connect_helper
;
883 transport
->smart_options
= &(data
->transport_options
);
888 * Linux pipes can buffer 65536 bytes at once (and most platforms can
889 * buffer less), so attempt reads and writes with up to that size.
891 #define BUFFERSIZE 65536
892 /* This should be enough to hold debugging message. */
893 #define PBUFFERSIZE 8192
895 /* Print bidirectional transfer loop debug message. */
896 static void transfer_debug(const char *fmt
, ...)
899 char msgbuf
[PBUFFERSIZE
];
900 static int debug_enabled
= -1;
902 if (debug_enabled
< 0)
903 debug_enabled
= getenv("GIT_TRANSLOOP_DEBUG") ? 1 : 0;
908 vsnprintf(msgbuf
, PBUFFERSIZE
, fmt
, args
);
910 fprintf(stderr
, "Transfer loop debugging: %s\n", msgbuf
);
913 /* Stream state: More data may be coming in this direction. */
914 #define SSTATE_TRANSFERING 0
916 * Stream state: No more data coming in this direction, flushing rest of
919 #define SSTATE_FLUSHING 1
920 /* Stream state: Transfer in this direction finished. */
921 #define SSTATE_FINISHED 2
923 #define STATE_NEEDS_READING(state) ((state) <= SSTATE_TRANSFERING)
924 #define STATE_NEEDS_WRITING(state) ((state) <= SSTATE_FLUSHING)
925 #define STATE_NEEDS_CLOSING(state) ((state) == SSTATE_FLUSHING)
927 /* Unidirectional transfer. */
928 struct unidirectional_transfer
{
933 /* Is source socket? */
935 /* Is destination socket? */
937 /* Transfer state (TRANSFERING/FLUSHING/FINISHED) */
940 char buf
[BUFFERSIZE
];
943 /* Name of source. */
944 const char *src_name
;
945 /* Name of destination. */
946 const char *dest_name
;
949 /* Closes the target (for writing) if transfer has finished. */
950 static void udt_close_if_finished(struct unidirectional_transfer
*t
)
952 if (STATE_NEEDS_CLOSING(t
->state
) && !t
->bufuse
) {
953 t
->state
= SSTATE_FINISHED
;
955 shutdown(t
->dest
, SHUT_WR
);
958 transfer_debug("Closed %s.", t
->dest_name
);
963 * Tries to read read data from source into buffer. If buffer is full,
964 * no data is read. Returns 0 on success, -1 on error.
966 static int udt_do_read(struct unidirectional_transfer
*t
)
970 if (t
->bufuse
== BUFFERSIZE
)
971 return 0; /* No space for more. */
973 transfer_debug("%s is readable", t
->src_name
);
974 bytes
= read(t
->src
, t
->buf
+ t
->bufuse
, BUFFERSIZE
- t
->bufuse
);
975 if (bytes
< 0 && errno
!= EWOULDBLOCK
&& errno
!= EAGAIN
&&
977 error("read(%s) failed: %s", t
->src_name
, strerror(errno
));
979 } else if (bytes
== 0) {
980 transfer_debug("%s EOF (with %i bytes in buffer)",
981 t
->src_name
, t
->bufuse
);
982 t
->state
= SSTATE_FLUSHING
;
983 } else if (bytes
> 0) {
985 transfer_debug("Read %i bytes from %s (buffer now at %i)",
986 (int)bytes
, t
->src_name
, (int)t
->bufuse
);
991 /* Tries to write data from buffer into destination. If buffer is empty,
992 * no data is written. Returns 0 on success, -1 on error.
994 static int udt_do_write(struct unidirectional_transfer
*t
)
999 return 0; /* Nothing to write. */
1001 transfer_debug("%s is writable", t
->dest_name
);
1002 bytes
= write(t
->dest
, t
->buf
, t
->bufuse
);
1003 if (bytes
< 0 && errno
!= EWOULDBLOCK
&& errno
!= EAGAIN
&&
1005 error("write(%s) failed: %s", t
->dest_name
, strerror(errno
));
1007 } else if (bytes
> 0) {
1010 memmove(t
->buf
, t
->buf
+ bytes
, t
->bufuse
);
1011 transfer_debug("Wrote %i bytes to %s (buffer now at %i)",
1012 (int)bytes
, t
->dest_name
, (int)t
->bufuse
);
1018 /* State of bidirectional transfer loop. */
1019 struct bidirectional_transfer_state
{
1020 /* Direction from program to git. */
1021 struct unidirectional_transfer ptg
;
1022 /* Direction from git to program. */
1023 struct unidirectional_transfer gtp
;
1026 static void *udt_copy_task_routine(void *udt
)
1028 struct unidirectional_transfer
*t
= (struct unidirectional_transfer
*)udt
;
1029 while (t
->state
!= SSTATE_FINISHED
) {
1030 if (STATE_NEEDS_READING(t
->state
))
1033 if (STATE_NEEDS_WRITING(t
->state
))
1034 if (udt_do_write(t
))
1036 if (STATE_NEEDS_CLOSING(t
->state
))
1037 udt_close_if_finished(t
);
1039 return udt
; /* Just some non-NULL value. */
1045 * Join thread, with apporiate errors on failure. Name is name for the
1046 * thread (for error messages). Returns 0 on success, 1 on failure.
1048 static int tloop_join(pthread_t thread
, const char *name
)
1052 err
= pthread_join(thread
, &tret
);
1054 error("%s thread failed", name
);
1058 error("%s thread failed to join: %s", name
, strerror(err
));
1065 * Spawn the transfer tasks and then wait for them. Returns 0 on success,
1068 static int tloop_spawnwait_tasks(struct bidirectional_transfer_state
*s
)
1070 pthread_t gtp_thread
;
1071 pthread_t ptg_thread
;
1074 err
= pthread_create(>p_thread
, NULL
, udt_copy_task_routine
,
1077 die("Can't start thread for copying data: %s", strerror(err
));
1078 err
= pthread_create(&ptg_thread
, NULL
, udt_copy_task_routine
,
1081 die("Can't start thread for copying data: %s", strerror(err
));
1083 ret
|= tloop_join(gtp_thread
, "Git to program copy");
1084 ret
|= tloop_join(ptg_thread
, "Program to git copy");
1089 /* Close the source and target (for writing) for transfer. */
1090 static void udt_kill_transfer(struct unidirectional_transfer
*t
)
1092 t
->state
= SSTATE_FINISHED
;
1094 * Socket read end left open isn't a disaster if nobody
1095 * attempts to read from it (mingw compat headers do not
1098 * We can't fully close the socket since otherwise gtp
1099 * task would first close the socket it sends data to
1100 * while closing the ptg file descriptors.
1102 if (!t
->src_is_sock
)
1104 if (t
->dest_is_sock
)
1105 shutdown(t
->dest
, SHUT_WR
);
1111 * Join process, with apporiate errors on failure. Name is name for the
1112 * process (for error messages). Returns 0 on success, 1 on failure.
1114 static int tloop_join(pid_t pid
, const char *name
)
1117 if (waitpid(pid
, &tret
, 0) < 0) {
1118 error("%s process failed to wait: %s", name
, strerror(errno
));
1121 if (!WIFEXITED(tret
) || WEXITSTATUS(tret
)) {
1122 error("%s process failed", name
);
1129 * Spawn the transfer tasks and then wait for them. Returns 0 on success,
1132 static int tloop_spawnwait_tasks(struct bidirectional_transfer_state
*s
)
1137 /* Fork thread #1: git to program. */
1140 die_errno("Can't start thread for copying data");
1141 else if (pid1
== 0) {
1142 udt_kill_transfer(&s
->ptg
);
1143 exit(udt_copy_task_routine(&s
->gtp
) ? 0 : 1);
1146 /* Fork thread #2: program to git. */
1149 die_errno("Can't start thread for copying data");
1150 else if (pid2
== 0) {
1151 udt_kill_transfer(&s
->gtp
);
1152 exit(udt_copy_task_routine(&s
->ptg
) ? 0 : 1);
1156 * Close both streams in parent as to not interfere with
1157 * end of file detection and wait for both tasks to finish.
1159 udt_kill_transfer(&s
->gtp
);
1160 udt_kill_transfer(&s
->ptg
);
1161 ret
|= tloop_join(pid1
, "Git to program copy");
1162 ret
|= tloop_join(pid2
, "Program to git copy");
1168 * Copies data from stdin to output and from input to stdout simultaneously.
1169 * Additionally filtering through given filter. If filter is NULL, uses
1172 int bidirectional_transfer_loop(int input
, int output
)
1174 struct bidirectional_transfer_state state
;
1176 /* Fill the state fields. */
1177 state
.ptg
.src
= input
;
1179 state
.ptg
.src_is_sock
= (input
== output
);
1180 state
.ptg
.dest_is_sock
= 0;
1181 state
.ptg
.state
= SSTATE_TRANSFERING
;
1182 state
.ptg
.bufuse
= 0;
1183 state
.ptg
.src_name
= "remote input";
1184 state
.ptg
.dest_name
= "stdout";
1187 state
.gtp
.dest
= output
;
1188 state
.gtp
.src_is_sock
= 0;
1189 state
.gtp
.dest_is_sock
= (input
== output
);
1190 state
.gtp
.state
= SSTATE_TRANSFERING
;
1191 state
.gtp
.bufuse
= 0;
1192 state
.gtp
.src_name
= "stdin";
1193 state
.gtp
.dest_name
= "remote output";
1195 return tloop_spawnwait_tasks(&state
);