4 #include "run-command.h"
10 #include "string-list.h"
11 #include "thread-utils.h"
13 #include "argv-array.h"
19 struct child_process
*helper
;
28 no_disconnect_req
: 1;
31 /* These go from remote name (as in "list") to private name */
32 struct refspec
*refspecs
;
34 /* Transport options for fetch-pack/send-pack (should one of
37 struct git_transport_options transport_options
;
40 static void sendline(struct helper_data
*helper
, struct strbuf
*buffer
)
43 fprintf(stderr
, "Debug: Remote helper: -> %s", buffer
->buf
);
44 if (write_in_full(helper
->helper
->in
, buffer
->buf
, buffer
->len
)
46 die_errno("Full write to remote helper failed");
49 static int recvline_fh(FILE *helper
, struct strbuf
*buffer
, const char *name
)
53 fprintf(stderr
, "Debug: Remote helper: Waiting...\n");
54 if (strbuf_getline(buffer
, helper
, '\n') == EOF
) {
56 fprintf(stderr
, "Debug: Remote helper quit.\n");
57 die("Reading from helper 'git-remote-%s' failed", name
);
61 fprintf(stderr
, "Debug: Remote helper: <- %s\n", buffer
->buf
);
65 static int recvline(struct helper_data
*helper
, struct strbuf
*buffer
)
67 return recvline_fh(helper
->out
, buffer
, helper
->name
);
70 static void xchgline(struct helper_data
*helper
, struct strbuf
*buffer
)
72 sendline(helper
, buffer
);
73 recvline(helper
, buffer
);
76 static void write_constant(int fd
, const char *str
)
79 fprintf(stderr
, "Debug: Remote helper: -> %s", str
);
80 if (write_in_full(fd
, str
, strlen(str
)) != strlen(str
))
81 die_errno("Full write to remote helper failed");
84 static const char *remove_ext_force(const char *url
)
87 const char *colon
= strchr(url
, ':');
88 if (colon
&& colon
[1] == ':')
94 static void do_take_over(struct transport
*transport
)
96 struct helper_data
*data
;
97 data
= (struct helper_data
*)transport
->data
;
98 transport_take_over(transport
, data
->helper
);
103 static struct child_process
*get_helper(struct transport
*transport
)
105 struct helper_data
*data
= transport
->data
;
106 struct argv_array argv
= ARGV_ARRAY_INIT
;
107 struct strbuf buf
= STRBUF_INIT
;
108 struct child_process
*helper
;
109 const char **refspecs
= NULL
;
111 int refspec_alloc
= 0;
114 char git_dir_buf
[sizeof(GIT_DIR_ENVIRONMENT
) + PATH_MAX
+ 1];
115 const char *helper_env
[] = {
124 helper
= xcalloc(1, sizeof(*helper
));
128 argv_array_pushf(&argv
, "git-remote-%s", data
->name
);
129 argv_array_push(&argv
, transport
->remote
->name
);
130 argv_array_push(&argv
, remove_ext_force(transport
->url
));
131 helper
->argv
= argv_array_detach(&argv
, NULL
);
133 helper
->silent_exec_failure
= 1;
135 snprintf(git_dir_buf
, sizeof(git_dir_buf
), "%s=%s", GIT_DIR_ENVIRONMENT
, get_git_dir());
136 helper
->env
= helper_env
;
138 code
= start_command(helper
);
139 if (code
< 0 && errno
== ENOENT
)
140 die("Unable to find remote helper for '%s'", data
->name
);
144 data
->helper
= helper
;
145 data
->no_disconnect_req
= 0;
148 * Open the output as FILE* so strbuf_getline() can be used.
149 * Do this with duped fd because fclose() will close the fd,
150 * and stuff like taking over will require the fd to remain.
152 duped
= dup(helper
->out
);
154 die_errno("Can't dup helper output fd");
155 data
->out
= xfdopen(duped
, "r");
157 write_constant(helper
->in
, "capabilities\n");
162 recvline(data
, &buf
);
167 if (*buf
.buf
== '*') {
168 capname
= buf
.buf
+ 1;
174 fprintf(stderr
, "Debug: Got cap %s\n", capname
);
175 if (!strcmp(capname
, "fetch"))
177 else if (!strcmp(capname
, "option"))
179 else if (!strcmp(capname
, "push"))
181 else if (!strcmp(capname
, "import"))
183 else if (!strcmp(capname
, "bidi-import"))
184 data
->bidi_import
= 1;
185 else if (!strcmp(capname
, "export"))
187 else if (!data
->refspecs
&& !prefixcmp(capname
, "refspec ")) {
191 refspecs
[refspec_nr
++] = xstrdup(capname
+ strlen("refspec "));
192 } else if (!strcmp(capname
, "connect")) {
194 } else if (!prefixcmp(capname
, "export-marks ")) {
195 struct strbuf arg
= STRBUF_INIT
;
196 strbuf_addstr(&arg
, "--export-marks=");
197 strbuf_addstr(&arg
, capname
+ strlen("export-marks "));
198 data
->export_marks
= strbuf_detach(&arg
, NULL
);
199 } else if (!prefixcmp(capname
, "import-marks")) {
200 struct strbuf arg
= STRBUF_INIT
;
201 strbuf_addstr(&arg
, "--import-marks=");
202 strbuf_addstr(&arg
, capname
+ strlen("import-marks "));
203 data
->import_marks
= strbuf_detach(&arg
, NULL
);
204 } else if (mandatory
) {
205 die("Unknown mandatory capability %s. This remote "
206 "helper probably needs newer version of Git.",
212 data
->refspec_nr
= refspec_nr
;
213 data
->refspecs
= parse_fetch_refspec(refspec_nr
, refspecs
);
214 for (i
= 0; i
< refspec_nr
; i
++) {
215 free((char *)refspecs
[i
]);
218 } else if (data
->import
|| data
->bidi_import
|| data
->export
) {
219 warning("This remote helper should implement refspec capability.");
221 strbuf_release(&buf
);
223 fprintf(stderr
, "Debug: Capabilities complete.\n");
227 static int disconnect_helper(struct transport
*transport
)
229 struct helper_data
*data
= transport
->data
;
234 fprintf(stderr
, "Debug: Disconnecting.\n");
235 if (!data
->no_disconnect_req
) {
237 * Ignore write errors; there's nothing we can do,
238 * since we're about to close the pipe anyway. And the
239 * most likely error is EPIPE due to the helper dying
240 * to report an error itself.
242 sigchain_push(SIGPIPE
, SIG_IGN
);
243 xwrite(data
->helper
->in
, "\n", 1);
244 sigchain_pop(SIGPIPE
);
246 close(data
->helper
->in
);
247 close(data
->helper
->out
);
249 res
= finish_command(data
->helper
);
250 argv_array_free_detached(data
->helper
->argv
);
257 static const char *unsupported_options
[] = {
258 TRANS_OPT_UPLOADPACK
,
259 TRANS_OPT_RECEIVEPACK
,
263 static const char *boolean_options
[] = {
269 static int set_helper_option(struct transport
*transport
,
270 const char *name
, const char *value
)
272 struct helper_data
*data
= transport
->data
;
273 struct strbuf buf
= STRBUF_INIT
;
274 int i
, ret
, is_bool
= 0;
276 get_helper(transport
);
281 for (i
= 0; i
< ARRAY_SIZE(unsupported_options
); i
++) {
282 if (!strcmp(name
, unsupported_options
[i
]))
286 for (i
= 0; i
< ARRAY_SIZE(boolean_options
); i
++) {
287 if (!strcmp(name
, boolean_options
[i
])) {
293 strbuf_addf(&buf
, "option %s ", name
);
295 strbuf_addstr(&buf
, value
? "true" : "false");
297 quote_c_style(value
, &buf
, NULL
, 0);
298 strbuf_addch(&buf
, '\n');
300 xchgline(data
, &buf
);
302 if (!strcmp(buf
.buf
, "ok"))
304 else if (!prefixcmp(buf
.buf
, "error")) {
306 } else if (!strcmp(buf
.buf
, "unsupported"))
309 warning("%s unexpectedly said: '%s'", data
->name
, buf
.buf
);
312 strbuf_release(&buf
);
316 static void standard_options(struct transport
*t
)
322 set_helper_option(t
, "progress", t
->progress
? "true" : "false");
324 n
= snprintf(buf
, sizeof(buf
), "%d", v
+ 1);
325 if (n
>= sizeof(buf
))
326 die("impossibly large verbosity value");
327 set_helper_option(t
, "verbosity", buf
);
330 static int release_helper(struct transport
*transport
)
333 struct helper_data
*data
= transport
->data
;
334 free_refspec(data
->refspec_nr
, data
->refspecs
);
335 data
->refspecs
= NULL
;
336 res
= disconnect_helper(transport
);
337 free(transport
->data
);
341 static int fetch_with_fetch(struct transport
*transport
,
342 int nr_heads
, struct ref
**to_fetch
)
344 struct helper_data
*data
= transport
->data
;
346 struct strbuf buf
= STRBUF_INIT
;
348 standard_options(transport
);
350 for (i
= 0; i
< nr_heads
; i
++) {
351 const struct ref
*posn
= to_fetch
[i
];
352 if (posn
->status
& REF_STATUS_UPTODATE
)
355 strbuf_addf(&buf
, "fetch %s %s\n",
356 sha1_to_hex(posn
->old_sha1
), posn
->name
);
359 strbuf_addch(&buf
, '\n');
360 sendline(data
, &buf
);
363 recvline(data
, &buf
);
365 if (!prefixcmp(buf
.buf
, "lock ")) {
366 const char *name
= buf
.buf
+ 5;
367 if (transport
->pack_lockfile
)
368 warning("%s also locked %s", data
->name
, name
);
370 transport
->pack_lockfile
= xstrdup(name
);
375 warning("%s unexpectedly said: '%s'", data
->name
, buf
.buf
);
377 strbuf_release(&buf
);
381 static int get_importer(struct transport
*transport
, struct child_process
*fastimport
)
383 struct child_process
*helper
= get_helper(transport
);
384 struct helper_data
*data
= transport
->data
;
385 struct argv_array argv
= ARGV_ARRAY_INIT
;
386 int cat_blob_fd
, code
;
387 memset(fastimport
, 0, sizeof(*fastimport
));
388 fastimport
->in
= helper
->out
;
389 argv_array_push(&argv
, "fast-import");
390 argv_array_push(&argv
, debug
? "--stats" : "--quiet");
392 if (data
->bidi_import
) {
393 cat_blob_fd
= xdup(helper
->in
);
394 argv_array_pushf(&argv
, "--cat-blob-fd=%d", cat_blob_fd
);
396 fastimport
->argv
= argv
.argv
;
397 fastimport
->git_cmd
= 1;
399 code
= start_command(fastimport
);
403 static int get_exporter(struct transport
*transport
,
404 struct child_process
*fastexport
,
405 struct string_list
*revlist_args
)
407 struct helper_data
*data
= transport
->data
;
408 struct child_process
*helper
= get_helper(transport
);
410 memset(fastexport
, 0, sizeof(*fastexport
));
412 /* we need to duplicate helper->in because we want to use it after
413 * fastexport is done with it. */
414 fastexport
->out
= dup(helper
->in
);
415 fastexport
->argv
= xcalloc(5 + revlist_args
->nr
, sizeof(*fastexport
->argv
));
416 fastexport
->argv
[argc
++] = "fast-export";
417 fastexport
->argv
[argc
++] = "--use-done-feature";
418 if (data
->export_marks
)
419 fastexport
->argv
[argc
++] = data
->export_marks
;
420 if (data
->import_marks
)
421 fastexport
->argv
[argc
++] = data
->import_marks
;
423 for (i
= 0; i
< revlist_args
->nr
; i
++)
424 fastexport
->argv
[argc
++] = revlist_args
->items
[i
].string
;
426 fastexport
->git_cmd
= 1;
427 return start_command(fastexport
);
430 static int fetch_with_import(struct transport
*transport
,
431 int nr_heads
, struct ref
**to_fetch
)
433 struct child_process fastimport
;
434 struct helper_data
*data
= transport
->data
;
437 struct strbuf buf
= STRBUF_INIT
;
439 get_helper(transport
);
441 if (get_importer(transport
, &fastimport
))
442 die("Couldn't run fast-import");
444 for (i
= 0; i
< nr_heads
; i
++) {
446 if (posn
->status
& REF_STATUS_UPTODATE
)
449 strbuf_addf(&buf
, "import %s\n", posn
->name
);
450 sendline(data
, &buf
);
454 write_constant(data
->helper
->in
, "\n");
456 * remote-helpers that advertise the bidi-import capability are required to
457 * buffer the complete batch of import commands until this newline before
458 * sending data to fast-import.
459 * These helpers read back data from fast-import on their stdin, which could
460 * be mixed with import commands, otherwise.
463 if (finish_command(&fastimport
))
464 die("Error while running fast-import");
465 argv_array_free_detached(fastimport
.argv
);
468 * The fast-import stream of a remote helper that advertises
469 * the "refspec" capability writes to the refs named after the
470 * right hand side of the first refspec matching each ref we
473 * (If no "refspec" capability was specified, for historical
474 * reasons we default to the equivalent of *:*.)
476 * Store the result in to_fetch[i].old_sha1. Callers such
477 * as "git fetch" can use the value to write feedback to the
478 * terminal, populate FETCH_HEAD, and determine what new value
479 * should be written to peer_ref if the update is a
480 * fast-forward or this is a forced update.
482 for (i
= 0; i
< nr_heads
; i
++) {
485 if (posn
->status
& REF_STATUS_UPTODATE
)
488 private = apply_refspecs(data
->refspecs
, data
->refspec_nr
, posn
->name
);
490 private = xstrdup(posn
->name
);
492 read_ref(private, posn
->old_sha1
);
496 strbuf_release(&buf
);
500 static int process_connect_service(struct transport
*transport
,
501 const char *name
, const char *exec
)
503 struct helper_data
*data
= transport
->data
;
504 struct strbuf cmdbuf
= STRBUF_INIT
;
505 struct child_process
*helper
;
506 int r
, duped
, ret
= 0;
509 helper
= get_helper(transport
);
512 * Yes, dup the pipe another time, as we need unbuffered version
513 * of input pipe as FILE*. fclose() closes the underlying fd and
514 * stream buffering only can be changed before first I/O operation
517 duped
= dup(helper
->out
);
519 die_errno("Can't dup helper output fd");
520 input
= xfdopen(duped
, "r");
521 setvbuf(input
, NULL
, _IONBF
, 0);
524 * Handle --upload-pack and friends. This is fire and forget...
525 * just warn if it fails.
527 if (strcmp(name
, exec
)) {
528 r
= set_helper_option(transport
, "servpath", exec
);
530 warning("Setting remote service path not supported by protocol.");
532 warning("Invalid remote service path.");
536 strbuf_addf(&cmdbuf
, "connect %s\n", name
);
540 sendline(data
, &cmdbuf
);
541 recvline_fh(input
, &cmdbuf
, name
);
542 if (!strcmp(cmdbuf
.buf
, "")) {
543 data
->no_disconnect_req
= 1;
545 fprintf(stderr
, "Debug: Smart transport connection "
548 } else if (!strcmp(cmdbuf
.buf
, "fallback")) {
550 fprintf(stderr
, "Debug: Falling back to dumb "
553 die("Unknown response to connect: %s",
561 static int process_connect(struct transport
*transport
,
564 struct helper_data
*data
= transport
->data
;
568 name
= for_push
? "git-receive-pack" : "git-upload-pack";
570 exec
= data
->transport_options
.receivepack
;
572 exec
= data
->transport_options
.uploadpack
;
574 return process_connect_service(transport
, name
, exec
);
577 static int connect_helper(struct transport
*transport
, const char *name
,
578 const char *exec
, int fd
[2])
580 struct helper_data
*data
= transport
->data
;
582 /* Get_helper so connect is inited. */
583 get_helper(transport
);
585 die("Operation not supported by protocol.");
587 if (!process_connect_service(transport
, name
, exec
))
588 die("Can't connect to subservice %s.", name
);
590 fd
[0] = data
->helper
->out
;
591 fd
[1] = data
->helper
->in
;
595 static int fetch(struct transport
*transport
,
596 int nr_heads
, struct ref
**to_fetch
)
598 struct helper_data
*data
= transport
->data
;
601 if (process_connect(transport
, 0)) {
602 do_take_over(transport
);
603 return transport
->fetch(transport
, nr_heads
, to_fetch
);
607 for (i
= 0; i
< nr_heads
; i
++)
608 if (!(to_fetch
[i
]->status
& REF_STATUS_UPTODATE
))
615 return fetch_with_fetch(transport
, nr_heads
, to_fetch
);
618 return fetch_with_import(transport
, nr_heads
, to_fetch
);
623 static void push_update_ref_status(struct strbuf
*buf
,
625 struct ref
*remote_refs
)
630 if (!prefixcmp(buf
->buf
, "ok ")) {
631 status
= REF_STATUS_OK
;
632 refname
= buf
->buf
+ 3;
633 } else if (!prefixcmp(buf
->buf
, "error ")) {
634 status
= REF_STATUS_REMOTE_REJECT
;
635 refname
= buf
->buf
+ 6;
637 die("expected ok/error, helper said '%s'", buf
->buf
);
639 msg
= strchr(refname
, ' ');
641 struct strbuf msg_buf
= STRBUF_INIT
;
645 if (!unquote_c_style(&msg_buf
, msg
, &end
))
646 msg
= strbuf_detach(&msg_buf
, NULL
);
649 strbuf_release(&msg_buf
);
651 if (!strcmp(msg
, "no match")) {
652 status
= REF_STATUS_NONE
;
656 else if (!strcmp(msg
, "up to date")) {
657 status
= REF_STATUS_UPTODATE
;
661 else if (!strcmp(msg
, "non-fast forward")) {
662 status
= REF_STATUS_REJECT_NONFASTFORWARD
;
666 else if (!strcmp(msg
, "already exists")) {
667 status
= REF_STATUS_REJECT_ALREADY_EXISTS
;
671 else if (!strcmp(msg
, "fetch first")) {
672 status
= REF_STATUS_REJECT_FETCH_FIRST
;
676 else if (!strcmp(msg
, "needs force")) {
677 status
= REF_STATUS_REJECT_NEEDS_FORCE
;
684 *ref
= find_ref_by_name(*ref
, refname
);
686 *ref
= find_ref_by_name(remote_refs
, refname
);
688 warning("helper reported unexpected status of %s", refname
);
692 if ((*ref
)->status
!= REF_STATUS_NONE
) {
694 * Earlier, the ref was marked not to be pushed, so ignore the ref
695 * status reported by the remote helper if the latter is 'no match'.
697 if (status
== REF_STATUS_NONE
)
701 (*ref
)->status
= status
;
702 (*ref
)->remote_status
= msg
;
705 static void push_update_refs_status(struct helper_data
*data
,
706 struct ref
*remote_refs
)
708 struct strbuf buf
= STRBUF_INIT
;
709 struct ref
*ref
= remote_refs
;
711 recvline(data
, &buf
);
715 push_update_ref_status(&buf
, &ref
, remote_refs
);
717 strbuf_release(&buf
);
720 static int push_refs_with_push(struct transport
*transport
,
721 struct ref
*remote_refs
, int flags
)
723 int force_all
= flags
& TRANSPORT_PUSH_FORCE
;
724 int mirror
= flags
& TRANSPORT_PUSH_MIRROR
;
725 struct helper_data
*data
= transport
->data
;
726 struct strbuf buf
= STRBUF_INIT
;
729 get_helper(transport
);
733 for (ref
= remote_refs
; ref
; ref
= ref
->next
) {
734 if (!ref
->peer_ref
&& !mirror
)
737 /* Check for statuses set by set_ref_status_for_push() */
738 switch (ref
->status
) {
739 case REF_STATUS_REJECT_NONFASTFORWARD
:
740 case REF_STATUS_REJECT_ALREADY_EXISTS
:
741 case REF_STATUS_UPTODATE
:
750 strbuf_addstr(&buf
, "push ");
751 if (!ref
->deletion
) {
753 strbuf_addch(&buf
, '+');
755 strbuf_addstr(&buf
, ref
->peer_ref
->name
);
757 strbuf_addstr(&buf
, sha1_to_hex(ref
->new_sha1
));
759 strbuf_addch(&buf
, ':');
760 strbuf_addstr(&buf
, ref
->name
);
761 strbuf_addch(&buf
, '\n');
766 standard_options(transport
);
768 if (flags
& TRANSPORT_PUSH_DRY_RUN
) {
769 if (set_helper_option(transport
, "dry-run", "true") != 0)
770 die("helper %s does not support dry-run", data
->name
);
773 strbuf_addch(&buf
, '\n');
774 sendline(data
, &buf
);
775 strbuf_release(&buf
);
777 push_update_refs_status(data
, remote_refs
);
781 static int push_refs_with_export(struct transport
*transport
,
782 struct ref
*remote_refs
, int flags
)
785 struct child_process
*helper
, exporter
;
786 struct helper_data
*data
= transport
->data
;
787 struct string_list revlist_args
= STRING_LIST_INIT_NODUP
;
788 struct strbuf buf
= STRBUF_INIT
;
791 die("remote-helper doesn't support push; refspec needed");
793 helper
= get_helper(transport
);
795 write_constant(helper
->in
, "export\n");
799 for (ref
= remote_refs
; ref
; ref
= ref
->next
) {
801 unsigned char sha1
[20];
803 private = apply_refspecs(data
->refspecs
, data
->refspec_nr
, ref
->name
);
804 if (private && !get_sha1(private, sha1
)) {
805 strbuf_addf(&buf
, "^%s", private);
806 string_list_append(&revlist_args
, strbuf_detach(&buf
, NULL
));
807 hashcpy(ref
->old_sha1
, sha1
);
812 die("remote-helpers do not support ref deletion");
816 string_list_append(&revlist_args
, ref
->peer_ref
->name
);
820 if (get_exporter(transport
, &exporter
, &revlist_args
))
821 die("Couldn't run fast-export");
823 if (finish_command(&exporter
))
824 die("Error while running fast-export");
825 push_update_refs_status(data
, remote_refs
);
829 static int push_refs(struct transport
*transport
,
830 struct ref
*remote_refs
, int flags
)
832 struct helper_data
*data
= transport
->data
;
834 if (process_connect(transport
, 1)) {
835 do_take_over(transport
);
836 return transport
->push_refs(transport
, remote_refs
, flags
);
840 fprintf(stderr
, "No refs in common and none specified; doing nothing.\n"
841 "Perhaps you should specify a branch such as 'master'.\n");
846 return push_refs_with_push(transport
, remote_refs
, flags
);
849 return push_refs_with_export(transport
, remote_refs
, flags
);
855 static int has_attribute(const char *attrs
, const char *attr
) {
862 const char *space
= strchrnul(attrs
, ' ');
863 if (len
== space
- attrs
&& !strncmp(attrs
, attr
, len
))
871 static struct ref
*get_refs_list(struct transport
*transport
, int for_push
)
873 struct helper_data
*data
= transport
->data
;
874 struct child_process
*helper
;
875 struct ref
*ret
= NULL
;
876 struct ref
**tail
= &ret
;
878 struct strbuf buf
= STRBUF_INIT
;
880 helper
= get_helper(transport
);
882 if (process_connect(transport
, for_push
)) {
883 do_take_over(transport
);
884 return transport
->get_refs_list(transport
, for_push
);
887 if (data
->push
&& for_push
)
888 write_str_in_full(helper
->in
, "list for-push\n");
890 write_str_in_full(helper
->in
, "list\n");
894 recvline(data
, &buf
);
899 eov
= strchr(buf
.buf
, ' ');
901 die("Malformed response in ref list: %s", buf
.buf
);
902 eon
= strchr(eov
+ 1, ' ');
906 *tail
= alloc_ref(eov
+ 1);
907 if (buf
.buf
[0] == '@')
908 (*tail
)->symref
= xstrdup(buf
.buf
+ 1);
909 else if (buf
.buf
[0] != '?')
910 get_sha1_hex(buf
.buf
, (*tail
)->old_sha1
);
912 if (has_attribute(eon
+ 1, "unchanged")) {
913 (*tail
)->status
|= REF_STATUS_UPTODATE
;
914 read_ref((*tail
)->name
, (*tail
)->old_sha1
);
917 tail
= &((*tail
)->next
);
920 fprintf(stderr
, "Debug: Read ref listing.\n");
921 strbuf_release(&buf
);
923 for (posn
= ret
; posn
; posn
= posn
->next
)
924 resolve_remote_symref(posn
, ret
);
929 int transport_helper_init(struct transport
*transport
, const char *name
)
931 struct helper_data
*data
= xcalloc(sizeof(*data
), 1);
934 if (getenv("GIT_TRANSPORT_HELPER_DEBUG"))
937 transport
->data
= data
;
938 transport
->set_option
= set_helper_option
;
939 transport
->get_refs_list
= get_refs_list
;
940 transport
->fetch
= fetch
;
941 transport
->push_refs
= push_refs
;
942 transport
->disconnect
= release_helper
;
943 transport
->connect
= connect_helper
;
944 transport
->smart_options
= &(data
->transport_options
);
949 * Linux pipes can buffer 65536 bytes at once (and most platforms can
950 * buffer less), so attempt reads and writes with up to that size.
952 #define BUFFERSIZE 65536
953 /* This should be enough to hold debugging message. */
954 #define PBUFFERSIZE 8192
956 /* Print bidirectional transfer loop debug message. */
957 static void transfer_debug(const char *fmt
, ...)
960 char msgbuf
[PBUFFERSIZE
];
961 static int debug_enabled
= -1;
963 if (debug_enabled
< 0)
964 debug_enabled
= getenv("GIT_TRANSLOOP_DEBUG") ? 1 : 0;
969 vsnprintf(msgbuf
, PBUFFERSIZE
, fmt
, args
);
971 fprintf(stderr
, "Transfer loop debugging: %s\n", msgbuf
);
974 /* Stream state: More data may be coming in this direction. */
975 #define SSTATE_TRANSFERING 0
977 * Stream state: No more data coming in this direction, flushing rest of
980 #define SSTATE_FLUSHING 1
981 /* Stream state: Transfer in this direction finished. */
982 #define SSTATE_FINISHED 2
984 #define STATE_NEEDS_READING(state) ((state) <= SSTATE_TRANSFERING)
985 #define STATE_NEEDS_WRITING(state) ((state) <= SSTATE_FLUSHING)
986 #define STATE_NEEDS_CLOSING(state) ((state) == SSTATE_FLUSHING)
988 /* Unidirectional transfer. */
989 struct unidirectional_transfer
{
994 /* Is source socket? */
996 /* Is destination socket? */
998 /* Transfer state (TRANSFERING/FLUSHING/FINISHED) */
1001 char buf
[BUFFERSIZE
];
1004 /* Name of source. */
1005 const char *src_name
;
1006 /* Name of destination. */
1007 const char *dest_name
;
1010 /* Closes the target (for writing) if transfer has finished. */
1011 static void udt_close_if_finished(struct unidirectional_transfer
*t
)
1013 if (STATE_NEEDS_CLOSING(t
->state
) && !t
->bufuse
) {
1014 t
->state
= SSTATE_FINISHED
;
1015 if (t
->dest_is_sock
)
1016 shutdown(t
->dest
, SHUT_WR
);
1019 transfer_debug("Closed %s.", t
->dest_name
);
1024 * Tries to read read data from source into buffer. If buffer is full,
1025 * no data is read. Returns 0 on success, -1 on error.
1027 static int udt_do_read(struct unidirectional_transfer
*t
)
1031 if (t
->bufuse
== BUFFERSIZE
)
1032 return 0; /* No space for more. */
1034 transfer_debug("%s is readable", t
->src_name
);
1035 bytes
= read(t
->src
, t
->buf
+ t
->bufuse
, BUFFERSIZE
- t
->bufuse
);
1036 if (bytes
< 0 && errno
!= EWOULDBLOCK
&& errno
!= EAGAIN
&&
1038 error("read(%s) failed: %s", t
->src_name
, strerror(errno
));
1040 } else if (bytes
== 0) {
1041 transfer_debug("%s EOF (with %i bytes in buffer)",
1042 t
->src_name
, t
->bufuse
);
1043 t
->state
= SSTATE_FLUSHING
;
1044 } else if (bytes
> 0) {
1046 transfer_debug("Read %i bytes from %s (buffer now at %i)",
1047 (int)bytes
, t
->src_name
, (int)t
->bufuse
);
1052 /* Tries to write data from buffer into destination. If buffer is empty,
1053 * no data is written. Returns 0 on success, -1 on error.
1055 static int udt_do_write(struct unidirectional_transfer
*t
)
1060 return 0; /* Nothing to write. */
1062 transfer_debug("%s is writable", t
->dest_name
);
1063 bytes
= write(t
->dest
, t
->buf
, t
->bufuse
);
1064 if (bytes
< 0 && errno
!= EWOULDBLOCK
&& errno
!= EAGAIN
&&
1066 error("write(%s) failed: %s", t
->dest_name
, strerror(errno
));
1068 } else if (bytes
> 0) {
1071 memmove(t
->buf
, t
->buf
+ bytes
, t
->bufuse
);
1072 transfer_debug("Wrote %i bytes to %s (buffer now at %i)",
1073 (int)bytes
, t
->dest_name
, (int)t
->bufuse
);
1079 /* State of bidirectional transfer loop. */
1080 struct bidirectional_transfer_state
{
1081 /* Direction from program to git. */
1082 struct unidirectional_transfer ptg
;
1083 /* Direction from git to program. */
1084 struct unidirectional_transfer gtp
;
1087 static void *udt_copy_task_routine(void *udt
)
1089 struct unidirectional_transfer
*t
= (struct unidirectional_transfer
*)udt
;
1090 while (t
->state
!= SSTATE_FINISHED
) {
1091 if (STATE_NEEDS_READING(t
->state
))
1094 if (STATE_NEEDS_WRITING(t
->state
))
1095 if (udt_do_write(t
))
1097 if (STATE_NEEDS_CLOSING(t
->state
))
1098 udt_close_if_finished(t
);
1100 return udt
; /* Just some non-NULL value. */
1106 * Join thread, with apporiate errors on failure. Name is name for the
1107 * thread (for error messages). Returns 0 on success, 1 on failure.
1109 static int tloop_join(pthread_t thread
, const char *name
)
1113 err
= pthread_join(thread
, &tret
);
1115 error("%s thread failed", name
);
1119 error("%s thread failed to join: %s", name
, strerror(err
));
1126 * Spawn the transfer tasks and then wait for them. Returns 0 on success,
1129 static int tloop_spawnwait_tasks(struct bidirectional_transfer_state
*s
)
1131 pthread_t gtp_thread
;
1132 pthread_t ptg_thread
;
1135 err
= pthread_create(>p_thread
, NULL
, udt_copy_task_routine
,
1138 die("Can't start thread for copying data: %s", strerror(err
));
1139 err
= pthread_create(&ptg_thread
, NULL
, udt_copy_task_routine
,
1142 die("Can't start thread for copying data: %s", strerror(err
));
1144 ret
|= tloop_join(gtp_thread
, "Git to program copy");
1145 ret
|= tloop_join(ptg_thread
, "Program to git copy");
1150 /* Close the source and target (for writing) for transfer. */
1151 static void udt_kill_transfer(struct unidirectional_transfer
*t
)
1153 t
->state
= SSTATE_FINISHED
;
1155 * Socket read end left open isn't a disaster if nobody
1156 * attempts to read from it (mingw compat headers do not
1159 * We can't fully close the socket since otherwise gtp
1160 * task would first close the socket it sends data to
1161 * while closing the ptg file descriptors.
1163 if (!t
->src_is_sock
)
1165 if (t
->dest_is_sock
)
1166 shutdown(t
->dest
, SHUT_WR
);
1172 * Join process, with apporiate errors on failure. Name is name for the
1173 * process (for error messages). Returns 0 on success, 1 on failure.
1175 static int tloop_join(pid_t pid
, const char *name
)
1178 if (waitpid(pid
, &tret
, 0) < 0) {
1179 error("%s process failed to wait: %s", name
, strerror(errno
));
1182 if (!WIFEXITED(tret
) || WEXITSTATUS(tret
)) {
1183 error("%s process failed", name
);
1190 * Spawn the transfer tasks and then wait for them. Returns 0 on success,
1193 static int tloop_spawnwait_tasks(struct bidirectional_transfer_state
*s
)
1198 /* Fork thread #1: git to program. */
1201 die_errno("Can't start thread for copying data");
1202 else if (pid1
== 0) {
1203 udt_kill_transfer(&s
->ptg
);
1204 exit(udt_copy_task_routine(&s
->gtp
) ? 0 : 1);
1207 /* Fork thread #2: program to git. */
1210 die_errno("Can't start thread for copying data");
1211 else if (pid2
== 0) {
1212 udt_kill_transfer(&s
->gtp
);
1213 exit(udt_copy_task_routine(&s
->ptg
) ? 0 : 1);
1217 * Close both streams in parent as to not interfere with
1218 * end of file detection and wait for both tasks to finish.
1220 udt_kill_transfer(&s
->gtp
);
1221 udt_kill_transfer(&s
->ptg
);
1222 ret
|= tloop_join(pid1
, "Git to program copy");
1223 ret
|= tloop_join(pid2
, "Program to git copy");
1229 * Copies data from stdin to output and from input to stdout simultaneously.
1230 * Additionally filtering through given filter. If filter is NULL, uses
1233 int bidirectional_transfer_loop(int input
, int output
)
1235 struct bidirectional_transfer_state state
;
1237 /* Fill the state fields. */
1238 state
.ptg
.src
= input
;
1240 state
.ptg
.src_is_sock
= (input
== output
);
1241 state
.ptg
.dest_is_sock
= 0;
1242 state
.ptg
.state
= SSTATE_TRANSFERING
;
1243 state
.ptg
.bufuse
= 0;
1244 state
.ptg
.src_name
= "remote input";
1245 state
.ptg
.dest_name
= "stdout";
1248 state
.gtp
.dest
= output
;
1249 state
.gtp
.src_is_sock
= 0;
1250 state
.gtp
.dest_is_sock
= (input
== output
);
1251 state
.gtp
.state
= SSTATE_TRANSFERING
;
1252 state
.gtp
.bufuse
= 0;
1253 state
.gtp
.src_name
= "stdin";
1254 state
.gtp
.dest_name
= "remote output";
1256 return tloop_spawnwait_tasks(&state
);