gitk: Second try to work around the command line limit on Windows
[git/dscho.git] / transport-helper.c
blob2638781c5b89024294f3c4c32861b275e339ad1d
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 "quote.h"
9 #include "remote.h"
11 static int debug;
13 struct helper_data
15 const char *name;
16 struct child_process *helper;
17 FILE *out;
18 unsigned fetch : 1,
19 import : 1,
20 option : 1,
21 push : 1,
22 connect : 1,
23 no_disconnect_req : 1;
24 /* These go from remote name (as in "list") to private name */
25 struct refspec *refspecs;
26 int refspec_nr;
27 /* Transport options for fetch-pack/send-pack (should one of
28 * those be invoked).
30 struct git_transport_options transport_options;
33 static void sendline(struct helper_data *helper, struct strbuf *buffer)
35 if (debug)
36 fprintf(stderr, "Debug: Remote helper: -> %s", buffer->buf);
37 if (write_in_full(helper->helper->in, buffer->buf, buffer->len)
38 != buffer->len)
39 die_errno("Full write to remote helper failed");
42 static int recvline_fh(FILE *helper, struct strbuf *buffer)
44 strbuf_reset(buffer);
45 if (debug)
46 fprintf(stderr, "Debug: Remote helper: Waiting...\n");
47 if (strbuf_getline(buffer, helper, '\n') == EOF) {
48 if (debug)
49 fprintf(stderr, "Debug: Remote helper quit.\n");
50 exit(128);
53 if (debug)
54 fprintf(stderr, "Debug: Remote helper: <- %s\n", buffer->buf);
55 return 0;
58 static int recvline(struct helper_data *helper, struct strbuf *buffer)
60 return recvline_fh(helper->out, buffer);
63 static void xchgline(struct helper_data *helper, struct strbuf *buffer)
65 sendline(helper, buffer);
66 recvline(helper, buffer);
69 static void write_constant(int fd, const char *str)
71 if (debug)
72 fprintf(stderr, "Debug: Remote helper: -> %s", str);
73 if (write_in_full(fd, str, strlen(str)) != strlen(str))
74 die_errno("Full write to remote helper failed");
77 const char *remove_ext_force(const char *url)
79 if (url) {
80 const char *colon = strchr(url, ':');
81 if (colon && colon[1] == ':')
82 return colon + 2;
84 return url;
87 static void do_take_over(struct transport *transport)
89 struct helper_data *data;
90 data = (struct helper_data *)transport->data;
91 transport_take_over(transport, data->helper);
92 fclose(data->out);
93 free(data);
96 static struct child_process *get_helper(struct transport *transport)
98 struct helper_data *data = transport->data;
99 struct strbuf buf = STRBUF_INIT;
100 struct child_process *helper;
101 const char **refspecs = NULL;
102 int refspec_nr = 0;
103 int refspec_alloc = 0;
104 int duped;
105 int code;
107 if (data->helper)
108 return data->helper;
110 helper = xcalloc(1, sizeof(*helper));
111 helper->in = -1;
112 helper->out = -1;
113 helper->err = 0;
114 helper->argv = xcalloc(4, sizeof(*helper->argv));
115 strbuf_addf(&buf, "git-remote-%s", data->name);
116 helper->argv[0] = strbuf_detach(&buf, NULL);
117 helper->argv[1] = transport->remote->name;
118 helper->argv[2] = remove_ext_force(transport->url);
119 helper->git_cmd = 0;
120 helper->silent_exec_failure = 1;
121 code = start_command(helper);
122 if (code < 0 && errno == ENOENT)
123 die("Unable to find remote helper for '%s'", data->name);
124 else if (code != 0)
125 exit(code);
127 data->helper = helper;
128 data->no_disconnect_req = 0;
131 * Open the output as FILE* so strbuf_getline() can be used.
132 * Do this with duped fd because fclose() will close the fd,
133 * and stuff like taking over will require the fd to remain.
135 duped = dup(helper->out);
136 if (duped < 0)
137 die_errno("Can't dup helper output fd");
138 data->out = xfdopen(duped, "r");
140 write_constant(helper->in, "capabilities\n");
142 while (1) {
143 const char *capname;
144 int mandatory = 0;
145 recvline(data, &buf);
147 if (!*buf.buf)
148 break;
150 if (*buf.buf == '*') {
151 capname = buf.buf + 1;
152 mandatory = 1;
153 } else
154 capname = buf.buf;
156 if (debug)
157 fprintf(stderr, "Debug: Got cap %s\n", capname);
158 if (!strcmp(capname, "fetch"))
159 data->fetch = 1;
160 else if (!strcmp(capname, "option"))
161 data->option = 1;
162 else if (!strcmp(capname, "push"))
163 data->push = 1;
164 else if (!strcmp(capname, "import"))
165 data->import = 1;
166 else if (!data->refspecs && !prefixcmp(capname, "refspec ")) {
167 ALLOC_GROW(refspecs,
168 refspec_nr + 1,
169 refspec_alloc);
170 refspecs[refspec_nr++] = strdup(buf.buf + strlen("refspec "));
171 } else if (!strcmp(capname, "connect")) {
172 data->connect = 1;
173 } else if (mandatory) {
174 die("Unknown mandatory capability %s. This remote "
175 "helper probably needs newer version of Git.\n",
176 capname);
179 if (refspecs) {
180 int i;
181 data->refspec_nr = refspec_nr;
182 data->refspecs = parse_fetch_refspec(refspec_nr, refspecs);
183 for (i = 0; i < refspec_nr; i++) {
184 free((char *)refspecs[i]);
186 free(refspecs);
188 strbuf_release(&buf);
189 if (debug)
190 fprintf(stderr, "Debug: Capabilities complete.\n");
191 return data->helper;
194 static int disconnect_helper(struct transport *transport)
196 struct helper_data *data = transport->data;
197 struct strbuf buf = STRBUF_INIT;
199 if (data->helper) {
200 if (debug)
201 fprintf(stderr, "Debug: Disconnecting.\n");
202 if (!data->no_disconnect_req) {
203 strbuf_addf(&buf, "\n");
204 sendline(data, &buf);
206 close(data->helper->in);
207 close(data->helper->out);
208 fclose(data->out);
209 finish_command(data->helper);
210 free((char *)data->helper->argv[0]);
211 free(data->helper->argv);
212 free(data->helper);
213 data->helper = NULL;
215 return 0;
218 static const char *unsupported_options[] = {
219 TRANS_OPT_UPLOADPACK,
220 TRANS_OPT_RECEIVEPACK,
221 TRANS_OPT_THIN,
222 TRANS_OPT_KEEP
224 static const char *boolean_options[] = {
225 TRANS_OPT_THIN,
226 TRANS_OPT_KEEP,
227 TRANS_OPT_FOLLOWTAGS
230 static int set_helper_option(struct transport *transport,
231 const char *name, const char *value)
233 struct helper_data *data = transport->data;
234 struct strbuf buf = STRBUF_INIT;
235 int i, ret, is_bool = 0;
237 get_helper(transport);
239 if (!data->option)
240 return 1;
242 for (i = 0; i < ARRAY_SIZE(unsupported_options); i++) {
243 if (!strcmp(name, unsupported_options[i]))
244 return 1;
247 for (i = 0; i < ARRAY_SIZE(boolean_options); i++) {
248 if (!strcmp(name, boolean_options[i])) {
249 is_bool = 1;
250 break;
254 strbuf_addf(&buf, "option %s ", name);
255 if (is_bool)
256 strbuf_addstr(&buf, value ? "true" : "false");
257 else
258 quote_c_style(value, &buf, NULL, 0);
259 strbuf_addch(&buf, '\n');
261 xchgline(data, &buf);
263 if (!strcmp(buf.buf, "ok"))
264 ret = 0;
265 else if (!prefixcmp(buf.buf, "error")) {
266 ret = -1;
267 } else if (!strcmp(buf.buf, "unsupported"))
268 ret = 1;
269 else {
270 warning("%s unexpectedly said: '%s'", data->name, buf.buf);
271 ret = 1;
273 strbuf_release(&buf);
274 return ret;
277 static void standard_options(struct transport *t)
279 char buf[16];
280 int n;
281 int v = t->verbose;
283 set_helper_option(t, "progress", t->progress ? "true" : "false");
285 n = snprintf(buf, sizeof(buf), "%d", v + 1);
286 if (n >= sizeof(buf))
287 die("impossibly large verbosity value");
288 set_helper_option(t, "verbosity", buf);
291 static int release_helper(struct transport *transport)
293 struct helper_data *data = transport->data;
294 free_refspec(data->refspec_nr, data->refspecs);
295 data->refspecs = NULL;
296 disconnect_helper(transport);
297 free(transport->data);
298 return 0;
301 static int fetch_with_fetch(struct transport *transport,
302 int nr_heads, struct ref **to_fetch)
304 struct helper_data *data = transport->data;
305 int i;
306 struct strbuf buf = STRBUF_INIT;
308 standard_options(transport);
310 for (i = 0; i < nr_heads; i++) {
311 const struct ref *posn = to_fetch[i];
312 if (posn->status & REF_STATUS_UPTODATE)
313 continue;
315 strbuf_addf(&buf, "fetch %s %s\n",
316 sha1_to_hex(posn->old_sha1), posn->name);
319 strbuf_addch(&buf, '\n');
320 sendline(data, &buf);
322 while (1) {
323 recvline(data, &buf);
325 if (!prefixcmp(buf.buf, "lock ")) {
326 const char *name = buf.buf + 5;
327 if (transport->pack_lockfile)
328 warning("%s also locked %s", data->name, name);
329 else
330 transport->pack_lockfile = xstrdup(name);
332 else if (!buf.len)
333 break;
334 else
335 warning("%s unexpectedly said: '%s'", data->name, buf.buf);
337 strbuf_release(&buf);
338 return 0;
341 static int get_importer(struct transport *transport, struct child_process *fastimport)
343 struct child_process *helper = get_helper(transport);
344 memset(fastimport, 0, sizeof(*fastimport));
345 fastimport->in = helper->out;
346 fastimport->argv = xcalloc(5, sizeof(*fastimport->argv));
347 fastimport->argv[0] = "fast-import";
348 fastimport->argv[1] = "--quiet";
350 fastimport->git_cmd = 1;
351 return start_command(fastimport);
354 static int fetch_with_import(struct transport *transport,
355 int nr_heads, struct ref **to_fetch)
357 struct child_process fastimport;
358 struct helper_data *data = transport->data;
359 int i;
360 struct ref *posn;
361 struct strbuf buf = STRBUF_INIT;
363 get_helper(transport);
365 if (get_importer(transport, &fastimport))
366 die("Couldn't run fast-import");
368 for (i = 0; i < nr_heads; i++) {
369 posn = to_fetch[i];
370 if (posn->status & REF_STATUS_UPTODATE)
371 continue;
373 strbuf_addf(&buf, "import %s\n", posn->name);
374 sendline(data, &buf);
375 strbuf_reset(&buf);
377 disconnect_helper(transport);
378 finish_command(&fastimport);
379 free(fastimport.argv);
380 fastimport.argv = NULL;
382 for (i = 0; i < nr_heads; i++) {
383 char *private;
384 posn = to_fetch[i];
385 if (posn->status & REF_STATUS_UPTODATE)
386 continue;
387 if (data->refspecs)
388 private = apply_refspecs(data->refspecs, data->refspec_nr, posn->name);
389 else
390 private = strdup(posn->name);
391 read_ref(private, posn->old_sha1);
392 free(private);
394 strbuf_release(&buf);
395 return 0;
398 static int process_connect_service(struct transport *transport,
399 const char *name, const char *exec)
401 struct helper_data *data = transport->data;
402 struct strbuf cmdbuf = STRBUF_INIT;
403 struct child_process *helper;
404 int r, duped, ret = 0;
405 FILE *input;
407 helper = get_helper(transport);
410 * Yes, dup the pipe another time, as we need unbuffered version
411 * of input pipe as FILE*. fclose() closes the underlying fd and
412 * stream buffering only can be changed before first I/O operation
413 * on it.
415 duped = dup(helper->out);
416 if (duped < 0)
417 die_errno("Can't dup helper output fd");
418 input = xfdopen(duped, "r");
419 setvbuf(input, NULL, _IONBF, 0);
422 * Handle --upload-pack and friends. This is fire and forget...
423 * just warn if it fails.
425 if (strcmp(name, exec)) {
426 r = set_helper_option(transport, "servpath", exec);
427 if (r > 0)
428 warning("Setting remote service path not supported by protocol.");
429 else if (r < 0)
430 warning("Invalid remote service path.");
433 if (data->connect)
434 strbuf_addf(&cmdbuf, "connect %s\n", name);
435 else
436 goto exit;
438 sendline(data, &cmdbuf);
439 recvline_fh(input, &cmdbuf);
440 if (!strcmp(cmdbuf.buf, "")) {
441 data->no_disconnect_req = 1;
442 if (debug)
443 fprintf(stderr, "Debug: Smart transport connection "
444 "ready.\n");
445 ret = 1;
446 } else if (!strcmp(cmdbuf.buf, "fallback")) {
447 if (debug)
448 fprintf(stderr, "Debug: Falling back to dumb "
449 "transport.\n");
450 } else
451 die("Unknown response to connect: %s",
452 cmdbuf.buf);
454 exit:
455 fclose(input);
456 return ret;
459 static int process_connect(struct transport *transport,
460 int for_push)
462 struct helper_data *data = transport->data;
463 const char *name;
464 const char *exec;
466 name = for_push ? "git-receive-pack" : "git-upload-pack";
467 if (for_push)
468 exec = data->transport_options.receivepack;
469 else
470 exec = data->transport_options.uploadpack;
472 return process_connect_service(transport, name, exec);
475 static int connect_helper(struct transport *transport, const char *name,
476 const char *exec, int fd[2])
478 struct helper_data *data = transport->data;
480 /* Get_helper so connect is inited. */
481 get_helper(transport);
482 if (!data->connect)
483 die("Operation not supported by protocol.");
485 if (!process_connect_service(transport, name, exec))
486 die("Can't connect to subservice %s.", name);
488 fd[0] = data->helper->out;
489 fd[1] = data->helper->in;
490 return 0;
493 static int fetch(struct transport *transport,
494 int nr_heads, struct ref **to_fetch)
496 struct helper_data *data = transport->data;
497 int i, count;
499 if (process_connect(transport, 0)) {
500 do_take_over(transport);
501 return transport->fetch(transport, nr_heads, to_fetch);
504 count = 0;
505 for (i = 0; i < nr_heads; i++)
506 if (!(to_fetch[i]->status & REF_STATUS_UPTODATE))
507 count++;
509 if (!count)
510 return 0;
512 if (data->fetch)
513 return fetch_with_fetch(transport, nr_heads, to_fetch);
515 if (data->import)
516 return fetch_with_import(transport, nr_heads, to_fetch);
518 return -1;
521 static int push_refs(struct transport *transport,
522 struct ref *remote_refs, int flags)
524 int force_all = flags & TRANSPORT_PUSH_FORCE;
525 int mirror = flags & TRANSPORT_PUSH_MIRROR;
526 struct helper_data *data = transport->data;
527 struct strbuf buf = STRBUF_INIT;
528 struct child_process *helper;
529 struct ref *ref;
531 if (process_connect(transport, 1)) {
532 do_take_over(transport);
533 return transport->push_refs(transport, remote_refs, flags);
536 if (!remote_refs) {
537 fprintf(stderr, "No refs in common and none specified; doing nothing.\n"
538 "Perhaps you should specify a branch such as 'master'.\n");
539 return 0;
542 helper = get_helper(transport);
543 if (!data->push)
544 return 1;
546 for (ref = remote_refs; ref; ref = ref->next) {
547 if (!ref->peer_ref && !mirror)
548 continue;
550 /* Check for statuses set by set_ref_status_for_push() */
551 switch (ref->status) {
552 case REF_STATUS_REJECT_NONFASTFORWARD:
553 case REF_STATUS_UPTODATE:
554 continue;
555 default:
556 ; /* do nothing */
559 if (force_all)
560 ref->force = 1;
562 strbuf_addstr(&buf, "push ");
563 if (!ref->deletion) {
564 if (ref->force)
565 strbuf_addch(&buf, '+');
566 if (ref->peer_ref)
567 strbuf_addstr(&buf, ref->peer_ref->name);
568 else
569 strbuf_addstr(&buf, sha1_to_hex(ref->new_sha1));
571 strbuf_addch(&buf, ':');
572 strbuf_addstr(&buf, ref->name);
573 strbuf_addch(&buf, '\n');
575 if (buf.len == 0)
576 return 0;
578 standard_options(transport);
580 if (flags & TRANSPORT_PUSH_DRY_RUN) {
581 if (set_helper_option(transport, "dry-run", "true") != 0)
582 die("helper %s does not support dry-run", data->name);
585 strbuf_addch(&buf, '\n');
586 sendline(data, &buf);
588 ref = remote_refs;
589 while (1) {
590 char *refname, *msg;
591 int status;
593 recvline(data, &buf);
594 if (!buf.len)
595 break;
597 if (!prefixcmp(buf.buf, "ok ")) {
598 status = REF_STATUS_OK;
599 refname = buf.buf + 3;
600 } else if (!prefixcmp(buf.buf, "error ")) {
601 status = REF_STATUS_REMOTE_REJECT;
602 refname = buf.buf + 6;
603 } else
604 die("expected ok/error, helper said '%s'\n", buf.buf);
606 msg = strchr(refname, ' ');
607 if (msg) {
608 struct strbuf msg_buf = STRBUF_INIT;
609 const char *end;
611 *msg++ = '\0';
612 if (!unquote_c_style(&msg_buf, msg, &end))
613 msg = strbuf_detach(&msg_buf, NULL);
614 else
615 msg = xstrdup(msg);
616 strbuf_release(&msg_buf);
618 if (!strcmp(msg, "no match")) {
619 status = REF_STATUS_NONE;
620 free(msg);
621 msg = NULL;
623 else if (!strcmp(msg, "up to date")) {
624 status = REF_STATUS_UPTODATE;
625 free(msg);
626 msg = NULL;
628 else if (!strcmp(msg, "non-fast forward")) {
629 status = REF_STATUS_REJECT_NONFASTFORWARD;
630 free(msg);
631 msg = NULL;
635 if (ref)
636 ref = find_ref_by_name(ref, refname);
637 if (!ref)
638 ref = find_ref_by_name(remote_refs, refname);
639 if (!ref) {
640 warning("helper reported unexpected status of %s", refname);
641 continue;
644 if (ref->status != REF_STATUS_NONE) {
646 * Earlier, the ref was marked not to be pushed, so ignore the ref
647 * status reported by the remote helper if the latter is 'no match'.
649 if (status == REF_STATUS_NONE)
650 continue;
653 ref->status = status;
654 ref->remote_status = msg;
656 strbuf_release(&buf);
657 return 0;
660 static int has_attribute(const char *attrs, const char *attr) {
661 int len;
662 if (!attrs)
663 return 0;
665 len = strlen(attr);
666 for (;;) {
667 const char *space = strchrnul(attrs, ' ');
668 if (len == space - attrs && !strncmp(attrs, attr, len))
669 return 1;
670 if (!*space)
671 return 0;
672 attrs = space + 1;
676 static struct ref *get_refs_list(struct transport *transport, int for_push)
678 struct helper_data *data = transport->data;
679 struct child_process *helper;
680 struct ref *ret = NULL;
681 struct ref **tail = &ret;
682 struct ref *posn;
683 struct strbuf buf = STRBUF_INIT;
685 helper = get_helper(transport);
687 if (process_connect(transport, for_push)) {
688 do_take_over(transport);
689 return transport->get_refs_list(transport, for_push);
692 if (data->push && for_push)
693 write_str_in_full(helper->in, "list for-push\n");
694 else
695 write_str_in_full(helper->in, "list\n");
697 while (1) {
698 char *eov, *eon;
699 recvline(data, &buf);
701 if (!*buf.buf)
702 break;
704 eov = strchr(buf.buf, ' ');
705 if (!eov)
706 die("Malformed response in ref list: %s", buf.buf);
707 eon = strchr(eov + 1, ' ');
708 *eov = '\0';
709 if (eon)
710 *eon = '\0';
711 *tail = alloc_ref(eov + 1);
712 if (buf.buf[0] == '@')
713 (*tail)->symref = xstrdup(buf.buf + 1);
714 else if (buf.buf[0] != '?')
715 get_sha1_hex(buf.buf, (*tail)->old_sha1);
716 if (eon) {
717 if (has_attribute(eon + 1, "unchanged")) {
718 (*tail)->status |= REF_STATUS_UPTODATE;
719 read_ref((*tail)->name, (*tail)->old_sha1);
722 tail = &((*tail)->next);
724 if (debug)
725 fprintf(stderr, "Debug: Read ref listing.\n");
726 strbuf_release(&buf);
728 for (posn = ret; posn; posn = posn->next)
729 resolve_remote_symref(posn, ret);
731 return ret;
734 int transport_helper_init(struct transport *transport, const char *name)
736 struct helper_data *data = xcalloc(sizeof(*data), 1);
737 data->name = name;
739 if (getenv("GIT_TRANSPORT_HELPER_DEBUG"))
740 debug = 1;
742 transport->data = data;
743 transport->set_option = set_helper_option;
744 transport->get_refs_list = get_refs_list;
745 transport->fetch = fetch;
746 transport->push_refs = push_refs;
747 transport->disconnect = release_helper;
748 transport->connect = connect_helper;
749 transport->smart_options = &(data->transport_options);
750 return 0;