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1 | #include "cache.h" | |
2 | #include "transport.h" | |
3 | #include "quote.h" | |
4 | #include "run-command.h" | |
5 | #include "commit.h" | |
6 | #include "diff.h" | |
7 | #include "revision.h" | |
8 | #include "remote.h" | |
9 | #include "string-list.h" | |
10 | #include "thread-utils.h" | |
11 | #include "sigchain.h" | |
12 | #include "argv-array.h" | |
13 | #include "refs.h" | |
14 | #include "refspec.h" | |
15 | #include "transport-internal.h" | |
16 | #include "protocol.h" | |
17 | ||
18 | static int debug; | |
19 | ||
20 | struct helper_data { | |
21 | const char *name; | |
22 | struct child_process *helper; | |
23 | FILE *out; | |
24 | unsigned fetch : 1, | |
25 | import : 1, | |
26 | bidi_import : 1, | |
27 | export : 1, | |
28 | option : 1, | |
29 | push : 1, | |
30 | connect : 1, | |
31 | stateless_connect : 1, | |
32 | signed_tags : 1, | |
33 | check_connectivity : 1, | |
34 | no_disconnect_req : 1, | |
35 | no_private_update : 1; | |
36 | char *export_marks; | |
37 | char *import_marks; | |
38 | /* These go from remote name (as in "list") to private name */ | |
39 | struct refspec rs; | |
40 | /* Transport options for fetch-pack/send-pack (should one of | |
41 | * those be invoked). | |
42 | */ | |
43 | struct git_transport_options transport_options; | |
44 | }; | |
45 | ||
46 | static void sendline(struct helper_data *helper, struct strbuf *buffer) | |
47 | { | |
48 | if (debug) | |
49 | fprintf(stderr, "Debug: Remote helper: -> %s", buffer->buf); | |
50 | if (write_in_full(helper->helper->in, buffer->buf, buffer->len) < 0) | |
51 | die_errno(_("full write to remote helper failed")); | |
52 | } | |
53 | ||
54 | static int recvline_fh(FILE *helper, struct strbuf *buffer) | |
55 | { | |
56 | strbuf_reset(buffer); | |
57 | if (debug) | |
58 | fprintf(stderr, "Debug: Remote helper: Waiting...\n"); | |
59 | if (strbuf_getline(buffer, helper) == EOF) { | |
60 | if (debug) | |
61 | fprintf(stderr, "Debug: Remote helper quit.\n"); | |
62 | return 1; | |
63 | } | |
64 | ||
65 | if (debug) | |
66 | fprintf(stderr, "Debug: Remote helper: <- %s\n", buffer->buf); | |
67 | return 0; | |
68 | } | |
69 | ||
70 | static int recvline(struct helper_data *helper, struct strbuf *buffer) | |
71 | { | |
72 | return recvline_fh(helper->out, buffer); | |
73 | } | |
74 | ||
75 | static void write_constant(int fd, const char *str) | |
76 | { | |
77 | if (debug) | |
78 | fprintf(stderr, "Debug: Remote helper: -> %s", str); | |
79 | if (write_in_full(fd, str, strlen(str)) < 0) | |
80 | die_errno(_("full write to remote helper failed")); | |
81 | } | |
82 | ||
83 | static const char *remove_ext_force(const char *url) | |
84 | { | |
85 | if (url) { | |
86 | const char *colon = strchr(url, ':'); | |
87 | if (colon && colon[1] == ':') | |
88 | return colon + 2; | |
89 | } | |
90 | return url; | |
91 | } | |
92 | ||
93 | static void do_take_over(struct transport *transport) | |
94 | { | |
95 | struct helper_data *data; | |
96 | data = (struct helper_data *)transport->data; | |
97 | transport_take_over(transport, data->helper); | |
98 | fclose(data->out); | |
99 | free(data); | |
100 | } | |
101 | ||
102 | static void standard_options(struct transport *t); | |
103 | ||
104 | static struct child_process *get_helper(struct transport *transport) | |
105 | { | |
106 | struct helper_data *data = transport->data; | |
107 | struct strbuf buf = STRBUF_INIT; | |
108 | struct child_process *helper; | |
109 | int duped; | |
110 | int code; | |
111 | ||
112 | if (data->helper) | |
113 | return data->helper; | |
114 | ||
115 | helper = xmalloc(sizeof(*helper)); | |
116 | child_process_init(helper); | |
117 | helper->in = -1; | |
118 | helper->out = -1; | |
119 | helper->err = 0; | |
120 | argv_array_pushf(&helper->args, "git-remote-%s", data->name); | |
121 | argv_array_push(&helper->args, transport->remote->name); | |
122 | argv_array_push(&helper->args, remove_ext_force(transport->url)); | |
123 | helper->git_cmd = 0; | |
124 | helper->silent_exec_failure = 1; | |
125 | ||
126 | if (have_git_dir()) | |
127 | argv_array_pushf(&helper->env_array, "%s=%s", | |
128 | GIT_DIR_ENVIRONMENT, get_git_dir()); | |
129 | ||
130 | helper->trace2_child_class = helper->args.argv[0]; /* "remote-<name>" */ | |
131 | ||
132 | code = start_command(helper); | |
133 | if (code < 0 && errno == ENOENT) | |
134 | die(_("unable to find remote helper for '%s'"), data->name); | |
135 | else if (code != 0) | |
136 | exit(code); | |
137 | ||
138 | data->helper = helper; | |
139 | data->no_disconnect_req = 0; | |
140 | refspec_init(&data->rs, REFSPEC_FETCH); | |
141 | ||
142 | /* | |
143 | * Open the output as FILE* so strbuf_getline_*() family of | |
144 | * functions 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. | |
147 | */ | |
148 | duped = dup(helper->out); | |
149 | if (duped < 0) | |
150 | die_errno(_("can't dup helper output fd")); | |
151 | data->out = xfdopen(duped, "r"); | |
152 | ||
153 | write_constant(helper->in, "capabilities\n"); | |
154 | ||
155 | while (1) { | |
156 | const char *capname, *arg; | |
157 | int mandatory = 0; | |
158 | if (recvline(data, &buf)) | |
159 | exit(128); | |
160 | ||
161 | if (!*buf.buf) | |
162 | break; | |
163 | ||
164 | if (*buf.buf == '*') { | |
165 | capname = buf.buf + 1; | |
166 | mandatory = 1; | |
167 | } else | |
168 | capname = buf.buf; | |
169 | ||
170 | if (debug) | |
171 | fprintf(stderr, "Debug: Got cap %s\n", capname); | |
172 | if (!strcmp(capname, "fetch")) | |
173 | data->fetch = 1; | |
174 | else if (!strcmp(capname, "option")) | |
175 | data->option = 1; | |
176 | else if (!strcmp(capname, "push")) | |
177 | data->push = 1; | |
178 | else if (!strcmp(capname, "import")) | |
179 | data->import = 1; | |
180 | else if (!strcmp(capname, "bidi-import")) | |
181 | data->bidi_import = 1; | |
182 | else if (!strcmp(capname, "export")) | |
183 | data->export = 1; | |
184 | else if (!strcmp(capname, "check-connectivity")) | |
185 | data->check_connectivity = 1; | |
186 | else if (skip_prefix(capname, "refspec ", &arg)) { | |
187 | refspec_append(&data->rs, arg); | |
188 | } else if (!strcmp(capname, "connect")) { | |
189 | data->connect = 1; | |
190 | } else if (!strcmp(capname, "stateless-connect")) { | |
191 | data->stateless_connect = 1; | |
192 | } else if (!strcmp(capname, "signed-tags")) { | |
193 | data->signed_tags = 1; | |
194 | } else if (skip_prefix(capname, "export-marks ", &arg)) { | |
195 | data->export_marks = xstrdup(arg); | |
196 | } else if (skip_prefix(capname, "import-marks ", &arg)) { | |
197 | data->import_marks = xstrdup(arg); | |
198 | } else if (starts_with(capname, "no-private-update")) { | |
199 | data->no_private_update = 1; | |
200 | } else if (mandatory) { | |
201 | die(_("unknown mandatory capability %s; this remote " | |
202 | "helper probably needs newer version of Git"), | |
203 | capname); | |
204 | } | |
205 | } | |
206 | if (!data->rs.nr && (data->import || data->bidi_import || data->export)) { | |
207 | warning(_("this remote helper should implement refspec capability")); | |
208 | } | |
209 | strbuf_release(&buf); | |
210 | if (debug) | |
211 | fprintf(stderr, "Debug: Capabilities complete.\n"); | |
212 | standard_options(transport); | |
213 | return data->helper; | |
214 | } | |
215 | ||
216 | static int disconnect_helper(struct transport *transport) | |
217 | { | |
218 | struct helper_data *data = transport->data; | |
219 | int res = 0; | |
220 | ||
221 | if (data->helper) { | |
222 | if (debug) | |
223 | fprintf(stderr, "Debug: Disconnecting.\n"); | |
224 | if (!data->no_disconnect_req) { | |
225 | /* | |
226 | * Ignore write errors; there's nothing we can do, | |
227 | * since we're about to close the pipe anyway. And the | |
228 | * most likely error is EPIPE due to the helper dying | |
229 | * to report an error itself. | |
230 | */ | |
231 | sigchain_push(SIGPIPE, SIG_IGN); | |
232 | xwrite(data->helper->in, "\n", 1); | |
233 | sigchain_pop(SIGPIPE); | |
234 | } | |
235 | close(data->helper->in); | |
236 | close(data->helper->out); | |
237 | fclose(data->out); | |
238 | res = finish_command(data->helper); | |
239 | FREE_AND_NULL(data->helper); | |
240 | } | |
241 | return res; | |
242 | } | |
243 | ||
244 | static const char *unsupported_options[] = { | |
245 | TRANS_OPT_UPLOADPACK, | |
246 | TRANS_OPT_RECEIVEPACK, | |
247 | TRANS_OPT_THIN, | |
248 | TRANS_OPT_KEEP | |
249 | }; | |
250 | ||
251 | static const char *boolean_options[] = { | |
252 | TRANS_OPT_THIN, | |
253 | TRANS_OPT_KEEP, | |
254 | TRANS_OPT_FOLLOWTAGS, | |
255 | TRANS_OPT_DEEPEN_RELATIVE | |
256 | }; | |
257 | ||
258 | static int strbuf_set_helper_option(struct helper_data *data, | |
259 | struct strbuf *buf) | |
260 | { | |
261 | int ret; | |
262 | ||
263 | sendline(data, buf); | |
264 | if (recvline(data, buf)) | |
265 | exit(128); | |
266 | ||
267 | if (!strcmp(buf->buf, "ok")) | |
268 | ret = 0; | |
269 | else if (starts_with(buf->buf, "error")) | |
270 | ret = -1; | |
271 | else if (!strcmp(buf->buf, "unsupported")) | |
272 | ret = 1; | |
273 | else { | |
274 | warning(_("%s unexpectedly said: '%s'"), data->name, buf->buf); | |
275 | ret = 1; | |
276 | } | |
277 | return ret; | |
278 | } | |
279 | ||
280 | static int string_list_set_helper_option(struct helper_data *data, | |
281 | const char *name, | |
282 | struct string_list *list) | |
283 | { | |
284 | struct strbuf buf = STRBUF_INIT; | |
285 | int i, ret = 0; | |
286 | ||
287 | for (i = 0; i < list->nr; i++) { | |
288 | strbuf_addf(&buf, "option %s ", name); | |
289 | quote_c_style(list->items[i].string, &buf, NULL, 0); | |
290 | strbuf_addch(&buf, '\n'); | |
291 | ||
292 | if ((ret = strbuf_set_helper_option(data, &buf))) | |
293 | break; | |
294 | strbuf_reset(&buf); | |
295 | } | |
296 | strbuf_release(&buf); | |
297 | return ret; | |
298 | } | |
299 | ||
300 | static int set_helper_option(struct transport *transport, | |
301 | const char *name, const char *value) | |
302 | { | |
303 | struct helper_data *data = transport->data; | |
304 | struct strbuf buf = STRBUF_INIT; | |
305 | int i, ret, is_bool = 0; | |
306 | ||
307 | get_helper(transport); | |
308 | ||
309 | if (!data->option) | |
310 | return 1; | |
311 | ||
312 | if (!strcmp(name, "deepen-not")) | |
313 | return string_list_set_helper_option(data, name, | |
314 | (struct string_list *)value); | |
315 | ||
316 | for (i = 0; i < ARRAY_SIZE(unsupported_options); i++) { | |
317 | if (!strcmp(name, unsupported_options[i])) | |
318 | return 1; | |
319 | } | |
320 | ||
321 | for (i = 0; i < ARRAY_SIZE(boolean_options); i++) { | |
322 | if (!strcmp(name, boolean_options[i])) { | |
323 | is_bool = 1; | |
324 | break; | |
325 | } | |
326 | } | |
327 | ||
328 | strbuf_addf(&buf, "option %s ", name); | |
329 | if (is_bool) | |
330 | strbuf_addstr(&buf, value ? "true" : "false"); | |
331 | else | |
332 | quote_c_style(value, &buf, NULL, 0); | |
333 | strbuf_addch(&buf, '\n'); | |
334 | ||
335 | ret = strbuf_set_helper_option(data, &buf); | |
336 | strbuf_release(&buf); | |
337 | return ret; | |
338 | } | |
339 | ||
340 | static void standard_options(struct transport *t) | |
341 | { | |
342 | char buf[16]; | |
343 | int v = t->verbose; | |
344 | ||
345 | set_helper_option(t, "progress", t->progress ? "true" : "false"); | |
346 | ||
347 | xsnprintf(buf, sizeof(buf), "%d", v + 1); | |
348 | set_helper_option(t, "verbosity", buf); | |
349 | ||
350 | switch (t->family) { | |
351 | case TRANSPORT_FAMILY_ALL: | |
352 | /* | |
353 | * this is already the default, | |
354 | * do not break old remote helpers by setting "all" here | |
355 | */ | |
356 | break; | |
357 | case TRANSPORT_FAMILY_IPV4: | |
358 | set_helper_option(t, "family", "ipv4"); | |
359 | break; | |
360 | case TRANSPORT_FAMILY_IPV6: | |
361 | set_helper_option(t, "family", "ipv6"); | |
362 | break; | |
363 | } | |
364 | } | |
365 | ||
366 | static int release_helper(struct transport *transport) | |
367 | { | |
368 | int res = 0; | |
369 | struct helper_data *data = transport->data; | |
370 | refspec_clear(&data->rs); | |
371 | res = disconnect_helper(transport); | |
372 | free(transport->data); | |
373 | return res; | |
374 | } | |
375 | ||
376 | static int fetch_with_fetch(struct transport *transport, | |
377 | int nr_heads, struct ref **to_fetch) | |
378 | { | |
379 | struct helper_data *data = transport->data; | |
380 | int i; | |
381 | struct strbuf buf = STRBUF_INIT; | |
382 | ||
383 | for (i = 0; i < nr_heads; i++) { | |
384 | const struct ref *posn = to_fetch[i]; | |
385 | if (posn->status & REF_STATUS_UPTODATE) | |
386 | continue; | |
387 | ||
388 | strbuf_addf(&buf, "fetch %s %s\n", | |
389 | oid_to_hex(&posn->old_oid), | |
390 | posn->symref ? posn->symref : posn->name); | |
391 | } | |
392 | ||
393 | strbuf_addch(&buf, '\n'); | |
394 | sendline(data, &buf); | |
395 | ||
396 | while (1) { | |
397 | if (recvline(data, &buf)) | |
398 | exit(128); | |
399 | ||
400 | if (starts_with(buf.buf, "lock ")) { | |
401 | const char *name = buf.buf + 5; | |
402 | if (transport->pack_lockfile) | |
403 | warning(_("%s also locked %s"), data->name, name); | |
404 | else | |
405 | transport->pack_lockfile = xstrdup(name); | |
406 | } | |
407 | else if (data->check_connectivity && | |
408 | data->transport_options.check_self_contained_and_connected && | |
409 | !strcmp(buf.buf, "connectivity-ok")) | |
410 | data->transport_options.self_contained_and_connected = 1; | |
411 | else if (!buf.len) | |
412 | break; | |
413 | else | |
414 | warning(_("%s unexpectedly said: '%s'"), data->name, buf.buf); | |
415 | } | |
416 | strbuf_release(&buf); | |
417 | return 0; | |
418 | } | |
419 | ||
420 | static int get_importer(struct transport *transport, struct child_process *fastimport) | |
421 | { | |
422 | struct child_process *helper = get_helper(transport); | |
423 | struct helper_data *data = transport->data; | |
424 | int cat_blob_fd, code; | |
425 | child_process_init(fastimport); | |
426 | fastimport->in = xdup(helper->out); | |
427 | argv_array_push(&fastimport->args, "fast-import"); | |
428 | argv_array_push(&fastimport->args, debug ? "--stats" : "--quiet"); | |
429 | ||
430 | if (data->bidi_import) { | |
431 | cat_blob_fd = xdup(helper->in); | |
432 | argv_array_pushf(&fastimport->args, "--cat-blob-fd=%d", cat_blob_fd); | |
433 | } | |
434 | fastimport->git_cmd = 1; | |
435 | ||
436 | code = start_command(fastimport); | |
437 | return code; | |
438 | } | |
439 | ||
440 | static int get_exporter(struct transport *transport, | |
441 | struct child_process *fastexport, | |
442 | struct string_list *revlist_args) | |
443 | { | |
444 | struct helper_data *data = transport->data; | |
445 | struct child_process *helper = get_helper(transport); | |
446 | int i; | |
447 | ||
448 | child_process_init(fastexport); | |
449 | ||
450 | /* we need to duplicate helper->in because we want to use it after | |
451 | * fastexport is done with it. */ | |
452 | fastexport->out = dup(helper->in); | |
453 | argv_array_push(&fastexport->args, "fast-export"); | |
454 | argv_array_push(&fastexport->args, "--use-done-feature"); | |
455 | argv_array_push(&fastexport->args, data->signed_tags ? | |
456 | "--signed-tags=verbatim" : "--signed-tags=warn-strip"); | |
457 | if (data->export_marks) | |
458 | argv_array_pushf(&fastexport->args, "--export-marks=%s.tmp", data->export_marks); | |
459 | if (data->import_marks) | |
460 | argv_array_pushf(&fastexport->args, "--import-marks=%s", data->import_marks); | |
461 | ||
462 | for (i = 0; i < revlist_args->nr; i++) | |
463 | argv_array_push(&fastexport->args, revlist_args->items[i].string); | |
464 | ||
465 | fastexport->git_cmd = 1; | |
466 | return start_command(fastexport); | |
467 | } | |
468 | ||
469 | static int fetch_with_import(struct transport *transport, | |
470 | int nr_heads, struct ref **to_fetch) | |
471 | { | |
472 | struct child_process fastimport; | |
473 | struct helper_data *data = transport->data; | |
474 | int i; | |
475 | struct ref *posn; | |
476 | struct strbuf buf = STRBUF_INIT; | |
477 | ||
478 | get_helper(transport); | |
479 | ||
480 | if (get_importer(transport, &fastimport)) | |
481 | die(_("couldn't run fast-import")); | |
482 | ||
483 | for (i = 0; i < nr_heads; i++) { | |
484 | posn = to_fetch[i]; | |
485 | if (posn->status & REF_STATUS_UPTODATE) | |
486 | continue; | |
487 | ||
488 | strbuf_addf(&buf, "import %s\n", | |
489 | posn->symref ? posn->symref : posn->name); | |
490 | sendline(data, &buf); | |
491 | strbuf_reset(&buf); | |
492 | } | |
493 | ||
494 | write_constant(data->helper->in, "\n"); | |
495 | /* | |
496 | * remote-helpers that advertise the bidi-import capability are required to | |
497 | * buffer the complete batch of import commands until this newline before | |
498 | * sending data to fast-import. | |
499 | * These helpers read back data from fast-import on their stdin, which could | |
500 | * be mixed with import commands, otherwise. | |
501 | */ | |
502 | ||
503 | if (finish_command(&fastimport)) | |
504 | die(_("error while running fast-import")); | |
505 | ||
506 | /* | |
507 | * The fast-import stream of a remote helper that advertises | |
508 | * the "refspec" capability writes to the refs named after the | |
509 | * right hand side of the first refspec matching each ref we | |
510 | * were fetching. | |
511 | * | |
512 | * (If no "refspec" capability was specified, for historical | |
513 | * reasons we default to the equivalent of *:*.) | |
514 | * | |
515 | * Store the result in to_fetch[i].old_sha1. Callers such | |
516 | * as "git fetch" can use the value to write feedback to the | |
517 | * terminal, populate FETCH_HEAD, and determine what new value | |
518 | * should be written to peer_ref if the update is a | |
519 | * fast-forward or this is a forced update. | |
520 | */ | |
521 | for (i = 0; i < nr_heads; i++) { | |
522 | char *private, *name; | |
523 | posn = to_fetch[i]; | |
524 | if (posn->status & REF_STATUS_UPTODATE) | |
525 | continue; | |
526 | name = posn->symref ? posn->symref : posn->name; | |
527 | if (data->rs.nr) | |
528 | private = apply_refspecs(&data->rs, name); | |
529 | else | |
530 | private = xstrdup(name); | |
531 | if (private) { | |
532 | if (read_ref(private, &posn->old_oid) < 0) | |
533 | die(_("could not read ref %s"), private); | |
534 | free(private); | |
535 | } | |
536 | } | |
537 | strbuf_release(&buf); | |
538 | return 0; | |
539 | } | |
540 | ||
541 | static int run_connect(struct transport *transport, struct strbuf *cmdbuf) | |
542 | { | |
543 | struct helper_data *data = transport->data; | |
544 | int ret = 0; | |
545 | int duped; | |
546 | FILE *input; | |
547 | struct child_process *helper; | |
548 | ||
549 | helper = get_helper(transport); | |
550 | ||
551 | /* | |
552 | * Yes, dup the pipe another time, as we need unbuffered version | |
553 | * of input pipe as FILE*. fclose() closes the underlying fd and | |
554 | * stream buffering only can be changed before first I/O operation | |
555 | * on it. | |
556 | */ | |
557 | duped = dup(helper->out); | |
558 | if (duped < 0) | |
559 | die_errno(_("can't dup helper output fd")); | |
560 | input = xfdopen(duped, "r"); | |
561 | setvbuf(input, NULL, _IONBF, 0); | |
562 | ||
563 | sendline(data, cmdbuf); | |
564 | if (recvline_fh(input, cmdbuf)) | |
565 | exit(128); | |
566 | ||
567 | if (!strcmp(cmdbuf->buf, "")) { | |
568 | data->no_disconnect_req = 1; | |
569 | if (debug) | |
570 | fprintf(stderr, "Debug: Smart transport connection " | |
571 | "ready.\n"); | |
572 | ret = 1; | |
573 | } else if (!strcmp(cmdbuf->buf, "fallback")) { | |
574 | if (debug) | |
575 | fprintf(stderr, "Debug: Falling back to dumb " | |
576 | "transport.\n"); | |
577 | } else { | |
578 | die(_("unknown response to connect: %s"), | |
579 | cmdbuf->buf); | |
580 | } | |
581 | ||
582 | fclose(input); | |
583 | return ret; | |
584 | } | |
585 | ||
586 | static int process_connect_service(struct transport *transport, | |
587 | const char *name, const char *exec) | |
588 | { | |
589 | struct helper_data *data = transport->data; | |
590 | struct strbuf cmdbuf = STRBUF_INIT; | |
591 | int ret = 0; | |
592 | ||
593 | /* | |
594 | * Handle --upload-pack and friends. This is fire and forget... | |
595 | * just warn if it fails. | |
596 | */ | |
597 | if (strcmp(name, exec)) { | |
598 | int r = set_helper_option(transport, "servpath", exec); | |
599 | if (r > 0) | |
600 | warning(_("setting remote service path not supported by protocol")); | |
601 | else if (r < 0) | |
602 | warning(_("invalid remote service path")); | |
603 | } | |
604 | ||
605 | if (data->connect) { | |
606 | strbuf_addf(&cmdbuf, "connect %s\n", name); | |
607 | ret = run_connect(transport, &cmdbuf); | |
608 | } else if (data->stateless_connect && | |
609 | (get_protocol_version_config() == protocol_v2) && | |
610 | !strcmp("git-upload-pack", name)) { | |
611 | strbuf_addf(&cmdbuf, "stateless-connect %s\n", name); | |
612 | ret = run_connect(transport, &cmdbuf); | |
613 | if (ret) | |
614 | transport->stateless_rpc = 1; | |
615 | } | |
616 | ||
617 | strbuf_release(&cmdbuf); | |
618 | return ret; | |
619 | } | |
620 | ||
621 | static int process_connect(struct transport *transport, | |
622 | int for_push) | |
623 | { | |
624 | struct helper_data *data = transport->data; | |
625 | const char *name; | |
626 | const char *exec; | |
627 | ||
628 | name = for_push ? "git-receive-pack" : "git-upload-pack"; | |
629 | if (for_push) | |
630 | exec = data->transport_options.receivepack; | |
631 | else | |
632 | exec = data->transport_options.uploadpack; | |
633 | ||
634 | return process_connect_service(transport, name, exec); | |
635 | } | |
636 | ||
637 | static int connect_helper(struct transport *transport, const char *name, | |
638 | const char *exec, int fd[2]) | |
639 | { | |
640 | struct helper_data *data = transport->data; | |
641 | ||
642 | /* Get_helper so connect is inited. */ | |
643 | get_helper(transport); | |
644 | if (!data->connect) | |
645 | die(_("operation not supported by protocol")); | |
646 | ||
647 | if (!process_connect_service(transport, name, exec)) | |
648 | die(_("can't connect to subservice %s"), name); | |
649 | ||
650 | fd[0] = data->helper->out; | |
651 | fd[1] = data->helper->in; | |
652 | return 0; | |
653 | } | |
654 | ||
655 | static int fetch(struct transport *transport, | |
656 | int nr_heads, struct ref **to_fetch) | |
657 | { | |
658 | struct helper_data *data = transport->data; | |
659 | int i, count; | |
660 | ||
661 | if (process_connect(transport, 0)) { | |
662 | do_take_over(transport); | |
663 | return transport->vtable->fetch(transport, nr_heads, to_fetch); | |
664 | } | |
665 | ||
666 | count = 0; | |
667 | for (i = 0; i < nr_heads; i++) | |
668 | if (!(to_fetch[i]->status & REF_STATUS_UPTODATE)) | |
669 | count++; | |
670 | ||
671 | if (!count) | |
672 | return 0; | |
673 | ||
674 | if (data->check_connectivity && | |
675 | data->transport_options.check_self_contained_and_connected) | |
676 | set_helper_option(transport, "check-connectivity", "true"); | |
677 | ||
678 | if (transport->cloning) | |
679 | set_helper_option(transport, "cloning", "true"); | |
680 | ||
681 | if (data->transport_options.update_shallow) | |
682 | set_helper_option(transport, "update-shallow", "true"); | |
683 | ||
684 | if (data->transport_options.filter_options.choice) { | |
685 | struct strbuf expanded_filter_spec = STRBUF_INIT; | |
686 | expand_list_objects_filter_spec( | |
687 | &data->transport_options.filter_options, | |
688 | &expanded_filter_spec); | |
689 | set_helper_option(transport, "filter", | |
690 | expanded_filter_spec.buf); | |
691 | strbuf_release(&expanded_filter_spec); | |
692 | } | |
693 | ||
694 | if (data->transport_options.negotiation_tips) | |
695 | warning("Ignoring --negotiation-tip because the protocol does not support it."); | |
696 | ||
697 | if (data->fetch) | |
698 | return fetch_with_fetch(transport, nr_heads, to_fetch); | |
699 | ||
700 | if (data->import) | |
701 | return fetch_with_import(transport, nr_heads, to_fetch); | |
702 | ||
703 | return -1; | |
704 | } | |
705 | ||
706 | static int push_update_ref_status(struct strbuf *buf, | |
707 | struct ref **ref, | |
708 | struct ref *remote_refs) | |
709 | { | |
710 | char *refname, *msg; | |
711 | int status, forced = 0; | |
712 | ||
713 | if (starts_with(buf->buf, "ok ")) { | |
714 | status = REF_STATUS_OK; | |
715 | refname = buf->buf + 3; | |
716 | } else if (starts_with(buf->buf, "error ")) { | |
717 | status = REF_STATUS_REMOTE_REJECT; | |
718 | refname = buf->buf + 6; | |
719 | } else | |
720 | die(_("expected ok/error, helper said '%s'"), buf->buf); | |
721 | ||
722 | msg = strchr(refname, ' '); | |
723 | if (msg) { | |
724 | struct strbuf msg_buf = STRBUF_INIT; | |
725 | const char *end; | |
726 | ||
727 | *msg++ = '\0'; | |
728 | if (!unquote_c_style(&msg_buf, msg, &end)) | |
729 | msg = strbuf_detach(&msg_buf, NULL); | |
730 | else | |
731 | msg = xstrdup(msg); | |
732 | strbuf_release(&msg_buf); | |
733 | ||
734 | if (!strcmp(msg, "no match")) { | |
735 | status = REF_STATUS_NONE; | |
736 | FREE_AND_NULL(msg); | |
737 | } | |
738 | else if (!strcmp(msg, "up to date")) { | |
739 | status = REF_STATUS_UPTODATE; | |
740 | FREE_AND_NULL(msg); | |
741 | } | |
742 | else if (!strcmp(msg, "non-fast forward")) { | |
743 | status = REF_STATUS_REJECT_NONFASTFORWARD; | |
744 | FREE_AND_NULL(msg); | |
745 | } | |
746 | else if (!strcmp(msg, "already exists")) { | |
747 | status = REF_STATUS_REJECT_ALREADY_EXISTS; | |
748 | FREE_AND_NULL(msg); | |
749 | } | |
750 | else if (!strcmp(msg, "fetch first")) { | |
751 | status = REF_STATUS_REJECT_FETCH_FIRST; | |
752 | FREE_AND_NULL(msg); | |
753 | } | |
754 | else if (!strcmp(msg, "needs force")) { | |
755 | status = REF_STATUS_REJECT_NEEDS_FORCE; | |
756 | FREE_AND_NULL(msg); | |
757 | } | |
758 | else if (!strcmp(msg, "stale info")) { | |
759 | status = REF_STATUS_REJECT_STALE; | |
760 | FREE_AND_NULL(msg); | |
761 | } | |
762 | else if (!strcmp(msg, "forced update")) { | |
763 | forced = 1; | |
764 | FREE_AND_NULL(msg); | |
765 | } | |
766 | } | |
767 | ||
768 | if (*ref) | |
769 | *ref = find_ref_by_name(*ref, refname); | |
770 | if (!*ref) | |
771 | *ref = find_ref_by_name(remote_refs, refname); | |
772 | if (!*ref) { | |
773 | warning(_("helper reported unexpected status of %s"), refname); | |
774 | return 1; | |
775 | } | |
776 | ||
777 | if ((*ref)->status != REF_STATUS_NONE) { | |
778 | /* | |
779 | * Earlier, the ref was marked not to be pushed, so ignore the ref | |
780 | * status reported by the remote helper if the latter is 'no match'. | |
781 | */ | |
782 | if (status == REF_STATUS_NONE) | |
783 | return 1; | |
784 | } | |
785 | ||
786 | (*ref)->status = status; | |
787 | (*ref)->forced_update |= forced; | |
788 | (*ref)->remote_status = msg; | |
789 | return !(status == REF_STATUS_OK); | |
790 | } | |
791 | ||
792 | static int push_update_refs_status(struct helper_data *data, | |
793 | struct ref *remote_refs, | |
794 | int flags) | |
795 | { | |
796 | struct strbuf buf = STRBUF_INIT; | |
797 | struct ref *ref = remote_refs; | |
798 | int ret = 0; | |
799 | ||
800 | for (;;) { | |
801 | char *private; | |
802 | ||
803 | if (recvline(data, &buf)) { | |
804 | ret = 1; | |
805 | break; | |
806 | } | |
807 | ||
808 | if (!buf.len) | |
809 | break; | |
810 | ||
811 | if (push_update_ref_status(&buf, &ref, remote_refs)) | |
812 | continue; | |
813 | ||
814 | if (flags & TRANSPORT_PUSH_DRY_RUN || !data->rs.nr || data->no_private_update) | |
815 | continue; | |
816 | ||
817 | /* propagate back the update to the remote namespace */ | |
818 | private = apply_refspecs(&data->rs, ref->name); | |
819 | if (!private) | |
820 | continue; | |
821 | update_ref("update by helper", private, &ref->new_oid, NULL, | |
822 | 0, 0); | |
823 | free(private); | |
824 | } | |
825 | strbuf_release(&buf); | |
826 | return ret; | |
827 | } | |
828 | ||
829 | static void set_common_push_options(struct transport *transport, | |
830 | const char *name, int flags) | |
831 | { | |
832 | if (flags & TRANSPORT_PUSH_DRY_RUN) { | |
833 | if (set_helper_option(transport, "dry-run", "true") != 0) | |
834 | die(_("helper %s does not support dry-run"), name); | |
835 | } else if (flags & TRANSPORT_PUSH_CERT_ALWAYS) { | |
836 | if (set_helper_option(transport, TRANS_OPT_PUSH_CERT, "true") != 0) | |
837 | die(_("helper %s does not support --signed"), name); | |
838 | } else if (flags & TRANSPORT_PUSH_CERT_IF_ASKED) { | |
839 | if (set_helper_option(transport, TRANS_OPT_PUSH_CERT, "if-asked") != 0) | |
840 | die(_("helper %s does not support --signed=if-asked"), name); | |
841 | } | |
842 | ||
843 | if (flags & TRANSPORT_PUSH_OPTIONS) { | |
844 | struct string_list_item *item; | |
845 | for_each_string_list_item(item, transport->push_options) | |
846 | if (set_helper_option(transport, "push-option", item->string) != 0) | |
847 | die(_("helper %s does not support 'push-option'"), name); | |
848 | } | |
849 | } | |
850 | ||
851 | static int push_refs_with_push(struct transport *transport, | |
852 | struct ref *remote_refs, int flags) | |
853 | { | |
854 | int force_all = flags & TRANSPORT_PUSH_FORCE; | |
855 | int mirror = flags & TRANSPORT_PUSH_MIRROR; | |
856 | int atomic = flags & TRANSPORT_PUSH_ATOMIC; | |
857 | struct helper_data *data = transport->data; | |
858 | struct strbuf buf = STRBUF_INIT; | |
859 | struct ref *ref; | |
860 | struct string_list cas_options = STRING_LIST_INIT_DUP; | |
861 | struct string_list_item *cas_option; | |
862 | ||
863 | get_helper(transport); | |
864 | if (!data->push) | |
865 | return 1; | |
866 | ||
867 | for (ref = remote_refs; ref; ref = ref->next) { | |
868 | if (!ref->peer_ref && !mirror) | |
869 | continue; | |
870 | ||
871 | /* Check for statuses set by set_ref_status_for_push() */ | |
872 | switch (ref->status) { | |
873 | case REF_STATUS_REJECT_NONFASTFORWARD: | |
874 | case REF_STATUS_REJECT_STALE: | |
875 | case REF_STATUS_REJECT_ALREADY_EXISTS: | |
876 | if (atomic) { | |
877 | string_list_clear(&cas_options, 0); | |
878 | return 0; | |
879 | } else | |
880 | continue; | |
881 | case REF_STATUS_UPTODATE: | |
882 | continue; | |
883 | default: | |
884 | ; /* do nothing */ | |
885 | } | |
886 | ||
887 | if (force_all) | |
888 | ref->force = 1; | |
889 | ||
890 | strbuf_addstr(&buf, "push "); | |
891 | if (!ref->deletion) { | |
892 | if (ref->force) | |
893 | strbuf_addch(&buf, '+'); | |
894 | if (ref->peer_ref) | |
895 | strbuf_addstr(&buf, ref->peer_ref->name); | |
896 | else | |
897 | strbuf_addstr(&buf, oid_to_hex(&ref->new_oid)); | |
898 | } | |
899 | strbuf_addch(&buf, ':'); | |
900 | strbuf_addstr(&buf, ref->name); | |
901 | strbuf_addch(&buf, '\n'); | |
902 | ||
903 | /* | |
904 | * The "--force-with-lease" options without explicit | |
905 | * values to expect have already been expanded into | |
906 | * the ref->old_oid_expect[] field; we can ignore | |
907 | * transport->smart_options->cas altogether and instead | |
908 | * can enumerate them from the refs. | |
909 | */ | |
910 | if (ref->expect_old_sha1) { | |
911 | struct strbuf cas = STRBUF_INIT; | |
912 | strbuf_addf(&cas, "%s:%s", | |
913 | ref->name, oid_to_hex(&ref->old_oid_expect)); | |
914 | string_list_append_nodup(&cas_options, | |
915 | strbuf_detach(&cas, NULL)); | |
916 | } | |
917 | } | |
918 | if (buf.len == 0) { | |
919 | string_list_clear(&cas_options, 0); | |
920 | return 0; | |
921 | } | |
922 | ||
923 | for_each_string_list_item(cas_option, &cas_options) | |
924 | set_helper_option(transport, "cas", cas_option->string); | |
925 | set_common_push_options(transport, data->name, flags); | |
926 | ||
927 | strbuf_addch(&buf, '\n'); | |
928 | sendline(data, &buf); | |
929 | strbuf_release(&buf); | |
930 | string_list_clear(&cas_options, 0); | |
931 | ||
932 | return push_update_refs_status(data, remote_refs, flags); | |
933 | } | |
934 | ||
935 | static int push_refs_with_export(struct transport *transport, | |
936 | struct ref *remote_refs, int flags) | |
937 | { | |
938 | struct ref *ref; | |
939 | struct child_process *helper, exporter; | |
940 | struct helper_data *data = transport->data; | |
941 | struct string_list revlist_args = STRING_LIST_INIT_DUP; | |
942 | struct strbuf buf = STRBUF_INIT; | |
943 | ||
944 | if (!data->rs.nr) | |
945 | die(_("remote-helper doesn't support push; refspec needed")); | |
946 | ||
947 | set_common_push_options(transport, data->name, flags); | |
948 | if (flags & TRANSPORT_PUSH_FORCE) { | |
949 | if (set_helper_option(transport, "force", "true") != 0) | |
950 | warning(_("helper %s does not support 'force'"), data->name); | |
951 | } | |
952 | ||
953 | helper = get_helper(transport); | |
954 | ||
955 | write_constant(helper->in, "export\n"); | |
956 | ||
957 | for (ref = remote_refs; ref; ref = ref->next) { | |
958 | char *private; | |
959 | struct object_id oid; | |
960 | ||
961 | private = apply_refspecs(&data->rs, ref->name); | |
962 | if (private && !get_oid(private, &oid)) { | |
963 | strbuf_addf(&buf, "^%s", private); | |
964 | string_list_append_nodup(&revlist_args, | |
965 | strbuf_detach(&buf, NULL)); | |
966 | oidcpy(&ref->old_oid, &oid); | |
967 | } | |
968 | free(private); | |
969 | ||
970 | if (ref->peer_ref) { | |
971 | if (strcmp(ref->name, ref->peer_ref->name)) { | |
972 | if (!ref->deletion) { | |
973 | const char *name; | |
974 | int flag; | |
975 | ||
976 | /* Follow symbolic refs (mainly for HEAD). */ | |
977 | name = resolve_ref_unsafe(ref->peer_ref->name, | |
978 | RESOLVE_REF_READING, | |
979 | &oid, &flag); | |
980 | if (!name || !(flag & REF_ISSYMREF)) | |
981 | name = ref->peer_ref->name; | |
982 | ||
983 | strbuf_addf(&buf, "%s:%s", name, ref->name); | |
984 | } else | |
985 | strbuf_addf(&buf, ":%s", ref->name); | |
986 | ||
987 | string_list_append(&revlist_args, "--refspec"); | |
988 | string_list_append(&revlist_args, buf.buf); | |
989 | strbuf_release(&buf); | |
990 | } | |
991 | if (!ref->deletion) | |
992 | string_list_append(&revlist_args, ref->peer_ref->name); | |
993 | } | |
994 | } | |
995 | ||
996 | if (get_exporter(transport, &exporter, &revlist_args)) | |
997 | die(_("couldn't run fast-export")); | |
998 | ||
999 | string_list_clear(&revlist_args, 1); | |
1000 | ||
1001 | if (finish_command(&exporter)) | |
1002 | die(_("error while running fast-export")); | |
1003 | if (push_update_refs_status(data, remote_refs, flags)) | |
1004 | return 1; | |
1005 | ||
1006 | if (data->export_marks) { | |
1007 | strbuf_addf(&buf, "%s.tmp", data->export_marks); | |
1008 | rename(buf.buf, data->export_marks); | |
1009 | strbuf_release(&buf); | |
1010 | } | |
1011 | ||
1012 | return 0; | |
1013 | } | |
1014 | ||
1015 | static int push_refs(struct transport *transport, | |
1016 | struct ref *remote_refs, int flags) | |
1017 | { | |
1018 | struct helper_data *data = transport->data; | |
1019 | ||
1020 | if (process_connect(transport, 1)) { | |
1021 | do_take_over(transport); | |
1022 | return transport->vtable->push_refs(transport, remote_refs, flags); | |
1023 | } | |
1024 | ||
1025 | if (!remote_refs) { | |
1026 | fprintf(stderr, | |
1027 | _("No refs in common and none specified; doing nothing.\n" | |
1028 | "Perhaps you should specify a branch such as 'master'.\n")); | |
1029 | return 0; | |
1030 | } | |
1031 | ||
1032 | if (data->push) | |
1033 | return push_refs_with_push(transport, remote_refs, flags); | |
1034 | ||
1035 | if (data->export) | |
1036 | return push_refs_with_export(transport, remote_refs, flags); | |
1037 | ||
1038 | return -1; | |
1039 | } | |
1040 | ||
1041 | ||
1042 | static int has_attribute(const char *attrs, const char *attr) | |
1043 | { | |
1044 | int len; | |
1045 | if (!attrs) | |
1046 | return 0; | |
1047 | ||
1048 | len = strlen(attr); | |
1049 | for (;;) { | |
1050 | const char *space = strchrnul(attrs, ' '); | |
1051 | if (len == space - attrs && !strncmp(attrs, attr, len)) | |
1052 | return 1; | |
1053 | if (!*space) | |
1054 | return 0; | |
1055 | attrs = space + 1; | |
1056 | } | |
1057 | } | |
1058 | ||
1059 | static struct ref *get_refs_list(struct transport *transport, int for_push, | |
1060 | const struct argv_array *ref_prefixes) | |
1061 | { | |
1062 | struct helper_data *data = transport->data; | |
1063 | struct child_process *helper; | |
1064 | struct ref *ret = NULL; | |
1065 | struct ref **tail = &ret; | |
1066 | struct ref *posn; | |
1067 | struct strbuf buf = STRBUF_INIT; | |
1068 | ||
1069 | helper = get_helper(transport); | |
1070 | ||
1071 | if (process_connect(transport, for_push)) { | |
1072 | do_take_over(transport); | |
1073 | return transport->vtable->get_refs_list(transport, for_push, ref_prefixes); | |
1074 | } | |
1075 | ||
1076 | if (data->push && for_push) | |
1077 | write_str_in_full(helper->in, "list for-push\n"); | |
1078 | else | |
1079 | write_str_in_full(helper->in, "list\n"); | |
1080 | ||
1081 | while (1) { | |
1082 | char *eov, *eon; | |
1083 | if (recvline(data, &buf)) | |
1084 | exit(128); | |
1085 | ||
1086 | if (!*buf.buf) | |
1087 | break; | |
1088 | ||
1089 | eov = strchr(buf.buf, ' '); | |
1090 | if (!eov) | |
1091 | die(_("malformed response in ref list: %s"), buf.buf); | |
1092 | eon = strchr(eov + 1, ' '); | |
1093 | *eov = '\0'; | |
1094 | if (eon) | |
1095 | *eon = '\0'; | |
1096 | *tail = alloc_ref(eov + 1); | |
1097 | if (buf.buf[0] == '@') | |
1098 | (*tail)->symref = xstrdup(buf.buf + 1); | |
1099 | else if (buf.buf[0] != '?') | |
1100 | get_oid_hex(buf.buf, &(*tail)->old_oid); | |
1101 | if (eon) { | |
1102 | if (has_attribute(eon + 1, "unchanged")) { | |
1103 | (*tail)->status |= REF_STATUS_UPTODATE; | |
1104 | if (read_ref((*tail)->name, &(*tail)->old_oid) < 0) | |
1105 | die(_("could not read ref %s"), | |
1106 | (*tail)->name); | |
1107 | } | |
1108 | } | |
1109 | tail = &((*tail)->next); | |
1110 | } | |
1111 | if (debug) | |
1112 | fprintf(stderr, "Debug: Read ref listing.\n"); | |
1113 | strbuf_release(&buf); | |
1114 | ||
1115 | for (posn = ret; posn; posn = posn->next) | |
1116 | resolve_remote_symref(posn, ret); | |
1117 | ||
1118 | return ret; | |
1119 | } | |
1120 | ||
1121 | static struct transport_vtable vtable = { | |
1122 | 0, | |
1123 | set_helper_option, | |
1124 | get_refs_list, | |
1125 | fetch, | |
1126 | push_refs, | |
1127 | connect_helper, | |
1128 | release_helper | |
1129 | }; | |
1130 | ||
1131 | int transport_helper_init(struct transport *transport, const char *name) | |
1132 | { | |
1133 | struct helper_data *data = xcalloc(1, sizeof(*data)); | |
1134 | data->name = name; | |
1135 | ||
1136 | transport_check_allowed(name); | |
1137 | ||
1138 | if (getenv("GIT_TRANSPORT_HELPER_DEBUG")) | |
1139 | debug = 1; | |
1140 | ||
1141 | transport->data = data; | |
1142 | transport->vtable = &vtable; | |
1143 | transport->smart_options = &(data->transport_options); | |
1144 | return 0; | |
1145 | } | |
1146 | ||
1147 | /* | |
1148 | * Linux pipes can buffer 65536 bytes at once (and most platforms can | |
1149 | * buffer less), so attempt reads and writes with up to that size. | |
1150 | */ | |
1151 | #define BUFFERSIZE 65536 | |
1152 | /* This should be enough to hold debugging message. */ | |
1153 | #define PBUFFERSIZE 8192 | |
1154 | ||
1155 | /* Print bidirectional transfer loop debug message. */ | |
1156 | __attribute__((format (printf, 1, 2))) | |
1157 | static void transfer_debug(const char *fmt, ...) | |
1158 | { | |
1159 | /* | |
1160 | * NEEDSWORK: This function is sometimes used from multiple threads, and | |
1161 | * we end up using debug_enabled racily. That "should not matter" since | |
1162 | * we always write the same value, but it's still wrong. This function | |
1163 | * is listed in .tsan-suppressions for the time being. | |
1164 | */ | |
1165 | ||
1166 | va_list args; | |
1167 | char msgbuf[PBUFFERSIZE]; | |
1168 | static int debug_enabled = -1; | |
1169 | ||
1170 | if (debug_enabled < 0) | |
1171 | debug_enabled = getenv("GIT_TRANSLOOP_DEBUG") ? 1 : 0; | |
1172 | if (!debug_enabled) | |
1173 | return; | |
1174 | ||
1175 | va_start(args, fmt); | |
1176 | vsnprintf(msgbuf, PBUFFERSIZE, fmt, args); | |
1177 | va_end(args); | |
1178 | fprintf(stderr, "Transfer loop debugging: %s\n", msgbuf); | |
1179 | } | |
1180 | ||
1181 | /* Stream state: More data may be coming in this direction. */ | |
1182 | #define SSTATE_TRANSFERRING 0 | |
1183 | /* | |
1184 | * Stream state: No more data coming in this direction, flushing rest of | |
1185 | * data. | |
1186 | */ | |
1187 | #define SSTATE_FLUSHING 1 | |
1188 | /* Stream state: Transfer in this direction finished. */ | |
1189 | #define SSTATE_FINISHED 2 | |
1190 | ||
1191 | #define STATE_NEEDS_READING(state) ((state) <= SSTATE_TRANSFERRING) | |
1192 | #define STATE_NEEDS_WRITING(state) ((state) <= SSTATE_FLUSHING) | |
1193 | #define STATE_NEEDS_CLOSING(state) ((state) == SSTATE_FLUSHING) | |
1194 | ||
1195 | /* Unidirectional transfer. */ | |
1196 | struct unidirectional_transfer { | |
1197 | /* Source */ | |
1198 | int src; | |
1199 | /* Destination */ | |
1200 | int dest; | |
1201 | /* Is source socket? */ | |
1202 | int src_is_sock; | |
1203 | /* Is destination socket? */ | |
1204 | int dest_is_sock; | |
1205 | /* Transfer state (TRANSFERRING/FLUSHING/FINISHED) */ | |
1206 | int state; | |
1207 | /* Buffer. */ | |
1208 | char buf[BUFFERSIZE]; | |
1209 | /* Buffer used. */ | |
1210 | size_t bufuse; | |
1211 | /* Name of source. */ | |
1212 | const char *src_name; | |
1213 | /* Name of destination. */ | |
1214 | const char *dest_name; | |
1215 | }; | |
1216 | ||
1217 | /* Closes the target (for writing) if transfer has finished. */ | |
1218 | static void udt_close_if_finished(struct unidirectional_transfer *t) | |
1219 | { | |
1220 | if (STATE_NEEDS_CLOSING(t->state) && !t->bufuse) { | |
1221 | t->state = SSTATE_FINISHED; | |
1222 | if (t->dest_is_sock) | |
1223 | shutdown(t->dest, SHUT_WR); | |
1224 | else | |
1225 | close(t->dest); | |
1226 | transfer_debug("Closed %s.", t->dest_name); | |
1227 | } | |
1228 | } | |
1229 | ||
1230 | /* | |
1231 | * Tries to read data from source into buffer. If buffer is full, | |
1232 | * no data is read. Returns 0 on success, -1 on error. | |
1233 | */ | |
1234 | static int udt_do_read(struct unidirectional_transfer *t) | |
1235 | { | |
1236 | ssize_t bytes; | |
1237 | ||
1238 | if (t->bufuse == BUFFERSIZE) | |
1239 | return 0; /* No space for more. */ | |
1240 | ||
1241 | transfer_debug("%s is readable", t->src_name); | |
1242 | bytes = xread(t->src, t->buf + t->bufuse, BUFFERSIZE - t->bufuse); | |
1243 | if (bytes < 0) { | |
1244 | error_errno(_("read(%s) failed"), t->src_name); | |
1245 | return -1; | |
1246 | } else if (bytes == 0) { | |
1247 | transfer_debug("%s EOF (with %i bytes in buffer)", | |
1248 | t->src_name, (int)t->bufuse); | |
1249 | t->state = SSTATE_FLUSHING; | |
1250 | } else if (bytes > 0) { | |
1251 | t->bufuse += bytes; | |
1252 | transfer_debug("Read %i bytes from %s (buffer now at %i)", | |
1253 | (int)bytes, t->src_name, (int)t->bufuse); | |
1254 | } | |
1255 | return 0; | |
1256 | } | |
1257 | ||
1258 | /* Tries to write data from buffer into destination. If buffer is empty, | |
1259 | * no data is written. Returns 0 on success, -1 on error. | |
1260 | */ | |
1261 | static int udt_do_write(struct unidirectional_transfer *t) | |
1262 | { | |
1263 | ssize_t bytes; | |
1264 | ||
1265 | if (t->bufuse == 0) | |
1266 | return 0; /* Nothing to write. */ | |
1267 | ||
1268 | transfer_debug("%s is writable", t->dest_name); | |
1269 | bytes = xwrite(t->dest, t->buf, t->bufuse); | |
1270 | if (bytes < 0) { | |
1271 | error_errno(_("write(%s) failed"), t->dest_name); | |
1272 | return -1; | |
1273 | } else if (bytes > 0) { | |
1274 | t->bufuse -= bytes; | |
1275 | if (t->bufuse) | |
1276 | memmove(t->buf, t->buf + bytes, t->bufuse); | |
1277 | transfer_debug("Wrote %i bytes to %s (buffer now at %i)", | |
1278 | (int)bytes, t->dest_name, (int)t->bufuse); | |
1279 | } | |
1280 | return 0; | |
1281 | } | |
1282 | ||
1283 | ||
1284 | /* State of bidirectional transfer loop. */ | |
1285 | struct bidirectional_transfer_state { | |
1286 | /* Direction from program to git. */ | |
1287 | struct unidirectional_transfer ptg; | |
1288 | /* Direction from git to program. */ | |
1289 | struct unidirectional_transfer gtp; | |
1290 | }; | |
1291 | ||
1292 | static void *udt_copy_task_routine(void *udt) | |
1293 | { | |
1294 | struct unidirectional_transfer *t = (struct unidirectional_transfer *)udt; | |
1295 | while (t->state != SSTATE_FINISHED) { | |
1296 | if (STATE_NEEDS_READING(t->state)) | |
1297 | if (udt_do_read(t)) | |
1298 | return NULL; | |
1299 | if (STATE_NEEDS_WRITING(t->state)) | |
1300 | if (udt_do_write(t)) | |
1301 | return NULL; | |
1302 | if (STATE_NEEDS_CLOSING(t->state)) | |
1303 | udt_close_if_finished(t); | |
1304 | } | |
1305 | return udt; /* Just some non-NULL value. */ | |
1306 | } | |
1307 | ||
1308 | #ifndef NO_PTHREADS | |
1309 | ||
1310 | /* | |
1311 | * Join thread, with appropriate errors on failure. Name is name for the | |
1312 | * thread (for error messages). Returns 0 on success, 1 on failure. | |
1313 | */ | |
1314 | static int tloop_join(pthread_t thread, const char *name) | |
1315 | { | |
1316 | int err; | |
1317 | void *tret; | |
1318 | err = pthread_join(thread, &tret); | |
1319 | if (!tret) { | |
1320 | error(_("%s thread failed"), name); | |
1321 | return 1; | |
1322 | } | |
1323 | if (err) { | |
1324 | error(_("%s thread failed to join: %s"), name, strerror(err)); | |
1325 | return 1; | |
1326 | } | |
1327 | return 0; | |
1328 | } | |
1329 | ||
1330 | /* | |
1331 | * Spawn the transfer tasks and then wait for them. Returns 0 on success, | |
1332 | * -1 on failure. | |
1333 | */ | |
1334 | static int tloop_spawnwait_tasks(struct bidirectional_transfer_state *s) | |
1335 | { | |
1336 | pthread_t gtp_thread; | |
1337 | pthread_t ptg_thread; | |
1338 | int err; | |
1339 | int ret = 0; | |
1340 | err = pthread_create(>p_thread, NULL, udt_copy_task_routine, | |
1341 | &s->gtp); | |
1342 | if (err) | |
1343 | die(_("can't start thread for copying data: %s"), strerror(err)); | |
1344 | err = pthread_create(&ptg_thread, NULL, udt_copy_task_routine, | |
1345 | &s->ptg); | |
1346 | if (err) | |
1347 | die(_("can't start thread for copying data: %s"), strerror(err)); | |
1348 | ||
1349 | ret |= tloop_join(gtp_thread, "Git to program copy"); | |
1350 | ret |= tloop_join(ptg_thread, "Program to git copy"); | |
1351 | return ret; | |
1352 | } | |
1353 | #else | |
1354 | ||
1355 | /* Close the source and target (for writing) for transfer. */ | |
1356 | static void udt_kill_transfer(struct unidirectional_transfer *t) | |
1357 | { | |
1358 | t->state = SSTATE_FINISHED; | |
1359 | /* | |
1360 | * Socket read end left open isn't a disaster if nobody | |
1361 | * attempts to read from it (mingw compat headers do not | |
1362 | * have SHUT_RD)... | |
1363 | * | |
1364 | * We can't fully close the socket since otherwise gtp | |
1365 | * task would first close the socket it sends data to | |
1366 | * while closing the ptg file descriptors. | |
1367 | */ | |
1368 | if (!t->src_is_sock) | |
1369 | close(t->src); | |
1370 | if (t->dest_is_sock) | |
1371 | shutdown(t->dest, SHUT_WR); | |
1372 | else | |
1373 | close(t->dest); | |
1374 | } | |
1375 | ||
1376 | /* | |
1377 | * Join process, with appropriate errors on failure. Name is name for the | |
1378 | * process (for error messages). Returns 0 on success, 1 on failure. | |
1379 | */ | |
1380 | static int tloop_join(pid_t pid, const char *name) | |
1381 | { | |
1382 | int tret; | |
1383 | if (waitpid(pid, &tret, 0) < 0) { | |
1384 | error_errno(_("%s process failed to wait"), name); | |
1385 | return 1; | |
1386 | } | |
1387 | if (!WIFEXITED(tret) || WEXITSTATUS(tret)) { | |
1388 | error(_("%s process failed"), name); | |
1389 | return 1; | |
1390 | } | |
1391 | return 0; | |
1392 | } | |
1393 | ||
1394 | /* | |
1395 | * Spawn the transfer tasks and then wait for them. Returns 0 on success, | |
1396 | * -1 on failure. | |
1397 | */ | |
1398 | static int tloop_spawnwait_tasks(struct bidirectional_transfer_state *s) | |
1399 | { | |
1400 | pid_t pid1, pid2; | |
1401 | int ret = 0; | |
1402 | ||
1403 | /* Fork thread #1: git to program. */ | |
1404 | pid1 = fork(); | |
1405 | if (pid1 < 0) | |
1406 | die_errno(_("can't start thread for copying data")); | |
1407 | else if (pid1 == 0) { | |
1408 | udt_kill_transfer(&s->ptg); | |
1409 | exit(udt_copy_task_routine(&s->gtp) ? 0 : 1); | |
1410 | } | |
1411 | ||
1412 | /* Fork thread #2: program to git. */ | |
1413 | pid2 = fork(); | |
1414 | if (pid2 < 0) | |
1415 | die_errno(_("can't start thread for copying data")); | |
1416 | else if (pid2 == 0) { | |
1417 | udt_kill_transfer(&s->gtp); | |
1418 | exit(udt_copy_task_routine(&s->ptg) ? 0 : 1); | |
1419 | } | |
1420 | ||
1421 | /* | |
1422 | * Close both streams in parent as to not interfere with | |
1423 | * end of file detection and wait for both tasks to finish. | |
1424 | */ | |
1425 | udt_kill_transfer(&s->gtp); | |
1426 | udt_kill_transfer(&s->ptg); | |
1427 | ret |= tloop_join(pid1, "Git to program copy"); | |
1428 | ret |= tloop_join(pid2, "Program to git copy"); | |
1429 | return ret; | |
1430 | } | |
1431 | #endif | |
1432 | ||
1433 | /* | |
1434 | * Copies data from stdin to output and from input to stdout simultaneously. | |
1435 | * Additionally filtering through given filter. If filter is NULL, uses | |
1436 | * identity filter. | |
1437 | */ | |
1438 | int bidirectional_transfer_loop(int input, int output) | |
1439 | { | |
1440 | struct bidirectional_transfer_state state; | |
1441 | ||
1442 | /* Fill the state fields. */ | |
1443 | state.ptg.src = input; | |
1444 | state.ptg.dest = 1; | |
1445 | state.ptg.src_is_sock = (input == output); | |
1446 | state.ptg.dest_is_sock = 0; | |
1447 | state.ptg.state = SSTATE_TRANSFERRING; | |
1448 | state.ptg.bufuse = 0; | |
1449 | state.ptg.src_name = "remote input"; | |
1450 | state.ptg.dest_name = "stdout"; | |
1451 | ||
1452 | state.gtp.src = 0; | |
1453 | state.gtp.dest = output; | |
1454 | state.gtp.src_is_sock = 0; | |
1455 | state.gtp.dest_is_sock = (input == output); | |
1456 | state.gtp.state = SSTATE_TRANSFERRING; | |
1457 | state.gtp.bufuse = 0; | |
1458 | state.gtp.src_name = "stdin"; | |
1459 | state.gtp.dest_name = "remote output"; | |
1460 | ||
1461 | return tloop_spawnwait_tasks(&state); | |
1462 | } |