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Commit | Line | Data |
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6eb996b5 DB |
1 | #include "cache.h" |
2 | #include "transport.h" | |
ae4efe19 | 3 | #include "quote.h" |
6eb996b5 DB |
4 | #include "run-command.h" |
5 | #include "commit.h" | |
6 | #include "diff.h" | |
7 | #include "revision.h" | |
ef08ef9e | 8 | #include "quote.h" |
72ff8943 | 9 | #include "remote.h" |
73b49a75 | 10 | #include "string-list.h" |
7851b1e6 | 11 | #include "thread-utils.h" |
c34fe630 | 12 | #include "sigchain.h" |
bfc366d9 | 13 | #include "argv-array.h" |
664059fb | 14 | #include "refs.h" |
7851b1e6 | 15 | |
bf3c523c IL |
16 | static int debug; |
17 | ||
9cba13ca | 18 | struct helper_data { |
6eb996b5 DB |
19 | const char *name; |
20 | struct child_process *helper; | |
292ce46b | 21 | FILE *out; |
ef08ef9e | 22 | unsigned fetch : 1, |
a24a32dd | 23 | import : 1, |
bfc366d9 | 24 | bidi_import : 1, |
73b49a75 | 25 | export : 1, |
ae4efe19 | 26 | option : 1, |
fa8c097c IL |
27 | push : 1, |
28 | connect : 1, | |
0d957a4d | 29 | signed_tags : 1, |
9ba38048 | 30 | check_connectivity : 1, |
597b831a MM |
31 | no_disconnect_req : 1, |
32 | no_private_update : 1; | |
a515ebe9 SR |
33 | char *export_marks; |
34 | char *import_marks; | |
72ff8943 DB |
35 | /* These go from remote name (as in "list") to private name */ |
36 | struct refspec *refspecs; | |
37 | int refspec_nr; | |
61b075bd IL |
38 | /* Transport options for fetch-pack/send-pack (should one of |
39 | * those be invoked). | |
40 | */ | |
41 | struct git_transport_options transport_options; | |
6eb996b5 DB |
42 | }; |
43 | ||
bf3c523c IL |
44 | static void sendline(struct helper_data *helper, struct strbuf *buffer) |
45 | { | |
46 | if (debug) | |
47 | fprintf(stderr, "Debug: Remote helper: -> %s", buffer->buf); | |
48 | if (write_in_full(helper->helper->in, buffer->buf, buffer->len) | |
49 | != buffer->len) | |
50 | die_errno("Full write to remote helper failed"); | |
51 | } | |
52 | ||
c096955c | 53 | static int recvline_fh(FILE *helper, struct strbuf *buffer, const char *name) |
bf3c523c IL |
54 | { |
55 | strbuf_reset(buffer); | |
56 | if (debug) | |
57 | fprintf(stderr, "Debug: Remote helper: Waiting...\n"); | |
fa8c097c | 58 | if (strbuf_getline(buffer, helper, '\n') == EOF) { |
bf3c523c IL |
59 | if (debug) |
60 | fprintf(stderr, "Debug: Remote helper quit.\n"); | |
5931b33e | 61 | return 1; |
bf3c523c IL |
62 | } |
63 | ||
64 | if (debug) | |
65 | fprintf(stderr, "Debug: Remote helper: <- %s\n", buffer->buf); | |
66 | return 0; | |
67 | } | |
68 | ||
fa8c097c IL |
69 | static int recvline(struct helper_data *helper, struct strbuf *buffer) |
70 | { | |
c096955c | 71 | return recvline_fh(helper->out, buffer, helper->name); |
fa8c097c IL |
72 | } |
73 | ||
bf3c523c IL |
74 | static void write_constant(int fd, const char *str) |
75 | { | |
76 | if (debug) | |
77 | fprintf(stderr, "Debug: Remote helper: -> %s", str); | |
78 | if (write_in_full(fd, str, strlen(str)) != strlen(str)) | |
79 | die_errno("Full write to remote helper failed"); | |
80 | } | |
81 | ||
c2e86add | 82 | static const char *remove_ext_force(const char *url) |
25d5cc48 IL |
83 | { |
84 | if (url) { | |
85 | const char *colon = strchr(url, ':'); | |
86 | if (colon && colon[1] == ':') | |
87 | return colon + 2; | |
88 | } | |
89 | return url; | |
90 | } | |
91 | ||
fa8c097c IL |
92 | static void do_take_over(struct transport *transport) |
93 | { | |
94 | struct helper_data *data; | |
95 | data = (struct helper_data *)transport->data; | |
96 | transport_take_over(transport, data->helper); | |
97 | fclose(data->out); | |
98 | free(data); | |
99 | } | |
100 | ||
6eb996b5 DB |
101 | static struct child_process *get_helper(struct transport *transport) |
102 | { | |
103 | struct helper_data *data = transport->data; | |
104 | struct strbuf buf = STRBUF_INIT; | |
105 | struct child_process *helper; | |
72ff8943 DB |
106 | const char **refspecs = NULL; |
107 | int refspec_nr = 0; | |
108 | int refspec_alloc = 0; | |
61b075bd | 109 | int duped; |
6b02de3b | 110 | int code; |
e1735872 DI |
111 | char git_dir_buf[sizeof(GIT_DIR_ENVIRONMENT) + PATH_MAX + 1]; |
112 | const char *helper_env[] = { | |
113 | git_dir_buf, | |
114 | NULL | |
115 | }; | |
116 | ||
6eb996b5 DB |
117 | |
118 | if (data->helper) | |
119 | return data->helper; | |
120 | ||
483bbd4e RS |
121 | helper = xmalloc(sizeof(*helper)); |
122 | child_process_init(helper); | |
6eb996b5 DB |
123 | helper->in = -1; |
124 | helper->out = -1; | |
125 | helper->err = 0; | |
e0ab2ac6 JK |
126 | argv_array_pushf(&helper->args, "git-remote-%s", data->name); |
127 | argv_array_push(&helper->args, transport->remote->name); | |
128 | argv_array_push(&helper->args, remove_ext_force(transport->url)); | |
6b02de3b IL |
129 | helper->git_cmd = 0; |
130 | helper->silent_exec_failure = 1; | |
e1735872 DI |
131 | |
132 | snprintf(git_dir_buf, sizeof(git_dir_buf), "%s=%s", GIT_DIR_ENVIRONMENT, get_git_dir()); | |
133 | helper->env = helper_env; | |
134 | ||
6b02de3b IL |
135 | code = start_command(helper); |
136 | if (code < 0 && errno == ENOENT) | |
137 | die("Unable to find remote helper for '%s'", data->name); | |
138 | else if (code != 0) | |
139 | exit(code); | |
140 | ||
6eb996b5 | 141 | data->helper = helper; |
fa8c097c | 142 | data->no_disconnect_req = 0; |
6eb996b5 | 143 | |
61b075bd IL |
144 | /* |
145 | * Open the output as FILE* so strbuf_getline() can be used. | |
146 | * Do this with duped fd because fclose() will close the fd, | |
147 | * and stuff like taking over will require the fd to remain. | |
61b075bd IL |
148 | */ |
149 | duped = dup(helper->out); | |
150 | if (duped < 0) | |
151 | die_errno("Can't dup helper output fd"); | |
152 | data->out = xfdopen(duped, "r"); | |
153 | ||
bf3c523c | 154 | write_constant(helper->in, "capabilities\n"); |
2d14d65c | 155 | |
6eb996b5 | 156 | while (1) { |
21a2d4ad | 157 | const char *capname, *arg; |
28ed5b35 | 158 | int mandatory = 0; |
5931b33e FC |
159 | if (recvline(data, &buf)) |
160 | exit(128); | |
6eb996b5 DB |
161 | |
162 | if (!*buf.buf) | |
163 | break; | |
28ed5b35 IL |
164 | |
165 | if (*buf.buf == '*') { | |
166 | capname = buf.buf + 1; | |
167 | mandatory = 1; | |
168 | } else | |
169 | capname = buf.buf; | |
170 | ||
bf3c523c | 171 | if (debug) |
28ed5b35 IL |
172 | fprintf(stderr, "Debug: Got cap %s\n", capname); |
173 | if (!strcmp(capname, "fetch")) | |
6eb996b5 | 174 | data->fetch = 1; |
28ed5b35 | 175 | else if (!strcmp(capname, "option")) |
ef08ef9e | 176 | data->option = 1; |
28ed5b35 | 177 | else if (!strcmp(capname, "push")) |
ae4efe19 | 178 | data->push = 1; |
28ed5b35 | 179 | else if (!strcmp(capname, "import")) |
e65e91ed | 180 | data->import = 1; |
bfc366d9 FA |
181 | else if (!strcmp(capname, "bidi-import")) |
182 | data->bidi_import = 1; | |
73b49a75 SR |
183 | else if (!strcmp(capname, "export")) |
184 | data->export = 1; | |
9ba38048 NTND |
185 | else if (!strcmp(capname, "check-connectivity")) |
186 | data->check_connectivity = 1; | |
21a2d4ad | 187 | else if (!data->refspecs && skip_prefix(capname, "refspec ", &arg)) { |
72ff8943 DB |
188 | ALLOC_GROW(refspecs, |
189 | refspec_nr + 1, | |
190 | refspec_alloc); | |
21a2d4ad | 191 | refspecs[refspec_nr++] = xstrdup(arg); |
fa8c097c IL |
192 | } else if (!strcmp(capname, "connect")) { |
193 | data->connect = 1; | |
0d957a4d JK |
194 | } else if (!strcmp(capname, "signed-tags")) { |
195 | data->signed_tags = 1; | |
21a2d4ad JK |
196 | } else if (skip_prefix(capname, "export-marks ", &arg)) { |
197 | data->export_marks = xstrdup(arg); | |
198 | } else if (skip_prefix(capname, "import-marks ", &arg)) { | |
199 | data->import_marks = xstrdup(arg); | |
59556548 | 200 | } else if (starts_with(capname, "no-private-update")) { |
597b831a | 201 | data->no_private_update = 1; |
28ed5b35 | 202 | } else if (mandatory) { |
9517e6b8 | 203 | die("Unknown mandatory capability %s. This remote " |
82247e9b | 204 | "helper probably needs newer version of Git.", |
28ed5b35 | 205 | capname); |
72ff8943 DB |
206 | } |
207 | } | |
208 | if (refspecs) { | |
209 | int i; | |
210 | data->refspec_nr = refspec_nr; | |
211 | data->refspecs = parse_fetch_refspec(refspec_nr, refspecs); | |
b120ef3e | 212 | for (i = 0; i < refspec_nr; i++) |
72ff8943 | 213 | free((char *)refspecs[i]); |
72ff8943 | 214 | free(refspecs); |
a93b4a09 FC |
215 | } else if (data->import || data->bidi_import || data->export) { |
216 | warning("This remote helper should implement refspec capability."); | |
6eb996b5 | 217 | } |
b962dbdc | 218 | strbuf_release(&buf); |
bf3c523c IL |
219 | if (debug) |
220 | fprintf(stderr, "Debug: Capabilities complete.\n"); | |
6eb996b5 DB |
221 | return data->helper; |
222 | } | |
223 | ||
224 | static int disconnect_helper(struct transport *transport) | |
225 | { | |
226 | struct helper_data *data = transport->data; | |
cc567322 | 227 | int res = 0; |
bf3c523c | 228 | |
6eb996b5 | 229 | if (data->helper) { |
bf3c523c IL |
230 | if (debug) |
231 | fprintf(stderr, "Debug: Disconnecting.\n"); | |
fa8c097c | 232 | if (!data->no_disconnect_req) { |
c34fe630 JK |
233 | /* |
234 | * Ignore write errors; there's nothing we can do, | |
235 | * since we're about to close the pipe anyway. And the | |
236 | * most likely error is EPIPE due to the helper dying | |
237 | * to report an error itself. | |
238 | */ | |
239 | sigchain_push(SIGPIPE, SIG_IGN); | |
240 | xwrite(data->helper->in, "\n", 1); | |
241 | sigchain_pop(SIGPIPE); | |
fa8c097c | 242 | } |
6eb996b5 | 243 | close(data->helper->in); |
61b075bd | 244 | close(data->helper->out); |
292ce46b | 245 | fclose(data->out); |
cc567322 | 246 | res = finish_command(data->helper); |
6eb996b5 DB |
247 | free(data->helper); |
248 | data->helper = NULL; | |
249 | } | |
cc567322 | 250 | return res; |
6eb996b5 DB |
251 | } |
252 | ||
ef08ef9e SP |
253 | static const char *unsupported_options[] = { |
254 | TRANS_OPT_UPLOADPACK, | |
255 | TRANS_OPT_RECEIVEPACK, | |
256 | TRANS_OPT_THIN, | |
257 | TRANS_OPT_KEEP | |
258 | }; | |
23cd01ec | 259 | |
ef08ef9e SP |
260 | static const char *boolean_options[] = { |
261 | TRANS_OPT_THIN, | |
262 | TRANS_OPT_KEEP, | |
263 | TRANS_OPT_FOLLOWTAGS | |
264 | }; | |
265 | ||
266 | static int set_helper_option(struct transport *transport, | |
267 | const char *name, const char *value) | |
268 | { | |
269 | struct helper_data *data = transport->data; | |
ef08ef9e SP |
270 | struct strbuf buf = STRBUF_INIT; |
271 | int i, ret, is_bool = 0; | |
272 | ||
bf3c523c IL |
273 | get_helper(transport); |
274 | ||
ef08ef9e SP |
275 | if (!data->option) |
276 | return 1; | |
277 | ||
278 | for (i = 0; i < ARRAY_SIZE(unsupported_options); i++) { | |
279 | if (!strcmp(name, unsupported_options[i])) | |
280 | return 1; | |
281 | } | |
282 | ||
283 | for (i = 0; i < ARRAY_SIZE(boolean_options); i++) { | |
284 | if (!strcmp(name, boolean_options[i])) { | |
285 | is_bool = 1; | |
286 | break; | |
287 | } | |
288 | } | |
289 | ||
290 | strbuf_addf(&buf, "option %s ", name); | |
291 | if (is_bool) | |
292 | strbuf_addstr(&buf, value ? "true" : "false"); | |
293 | else | |
294 | quote_c_style(value, &buf, NULL, 0); | |
295 | strbuf_addch(&buf, '\n'); | |
296 | ||
4a1b59c8 | 297 | sendline(data, &buf); |
5931b33e FC |
298 | if (recvline(data, &buf)) |
299 | exit(128); | |
ef08ef9e SP |
300 | |
301 | if (!strcmp(buf.buf, "ok")) | |
302 | ret = 0; | |
59556548 | 303 | else if (starts_with(buf.buf, "error")) { |
ef08ef9e SP |
304 | ret = -1; |
305 | } else if (!strcmp(buf.buf, "unsupported")) | |
306 | ret = 1; | |
307 | else { | |
308 | warning("%s unexpectedly said: '%s'", data->name, buf.buf); | |
309 | ret = 1; | |
310 | } | |
311 | strbuf_release(&buf); | |
312 | return ret; | |
313 | } | |
314 | ||
315 | static void standard_options(struct transport *t) | |
316 | { | |
317 | char buf[16]; | |
318 | int n; | |
319 | int v = t->verbose; | |
ef08ef9e | 320 | |
d01b3c02 | 321 | set_helper_option(t, "progress", t->progress ? "true" : "false"); |
ef08ef9e SP |
322 | |
323 | n = snprintf(buf, sizeof(buf), "%d", v + 1); | |
324 | if (n >= sizeof(buf)) | |
325 | die("impossibly large verbosity value"); | |
326 | set_helper_option(t, "verbosity", buf); | |
327 | } | |
328 | ||
f2a37151 DB |
329 | static int release_helper(struct transport *transport) |
330 | { | |
cc567322 | 331 | int res = 0; |
72ff8943 DB |
332 | struct helper_data *data = transport->data; |
333 | free_refspec(data->refspec_nr, data->refspecs); | |
334 | data->refspecs = NULL; | |
cc567322 | 335 | res = disconnect_helper(transport); |
f2a37151 | 336 | free(transport->data); |
cc567322 | 337 | return res; |
f2a37151 DB |
338 | } |
339 | ||
6eb996b5 | 340 | static int fetch_with_fetch(struct transport *transport, |
37148311 | 341 | int nr_heads, struct ref **to_fetch) |
6eb996b5 | 342 | { |
292ce46b | 343 | struct helper_data *data = transport->data; |
6eb996b5 DB |
344 | int i; |
345 | struct strbuf buf = STRBUF_INIT; | |
346 | ||
ef08ef9e | 347 | standard_options(transport); |
9ba38048 NTND |
348 | if (data->check_connectivity && |
349 | data->transport_options.check_self_contained_and_connected) | |
350 | set_helper_option(transport, "check-connectivity", "true"); | |
ef08ef9e | 351 | |
16094885 NTND |
352 | if (transport->cloning) |
353 | set_helper_option(transport, "cloning", "true"); | |
354 | ||
355 | if (data->transport_options.update_shallow) | |
356 | set_helper_option(transport, "update-shallow", "true"); | |
357 | ||
6eb996b5 | 358 | for (i = 0; i < nr_heads; i++) { |
1088261f | 359 | const struct ref *posn = to_fetch[i]; |
6eb996b5 DB |
360 | if (posn->status & REF_STATUS_UPTODATE) |
361 | continue; | |
2d14d65c DB |
362 | |
363 | strbuf_addf(&buf, "fetch %s %s\n", | |
364 | sha1_to_hex(posn->old_sha1), posn->name); | |
292ce46b | 365 | } |
2d14d65c | 366 | |
292ce46b | 367 | strbuf_addch(&buf, '\n'); |
bf3c523c | 368 | sendline(data, &buf); |
292ce46b SP |
369 | |
370 | while (1) { | |
5931b33e FC |
371 | if (recvline(data, &buf)) |
372 | exit(128); | |
292ce46b | 373 | |
59556548 | 374 | if (starts_with(buf.buf, "lock ")) { |
292ce46b SP |
375 | const char *name = buf.buf + 5; |
376 | if (transport->pack_lockfile) | |
377 | warning("%s also locked %s", data->name, name); | |
378 | else | |
379 | transport->pack_lockfile = xstrdup(name); | |
380 | } | |
9ba38048 NTND |
381 | else if (data->check_connectivity && |
382 | data->transport_options.check_self_contained_and_connected && | |
383 | !strcmp(buf.buf, "connectivity-ok")) | |
384 | data->transport_options.self_contained_and_connected = 1; | |
292ce46b SP |
385 | else if (!buf.len) |
386 | break; | |
387 | else | |
388 | warning("%s unexpectedly said: '%s'", data->name, buf.buf); | |
6eb996b5 | 389 | } |
292ce46b | 390 | strbuf_release(&buf); |
6eb996b5 DB |
391 | return 0; |
392 | } | |
393 | ||
e65e91ed DB |
394 | static int get_importer(struct transport *transport, struct child_process *fastimport) |
395 | { | |
396 | struct child_process *helper = get_helper(transport); | |
bfc366d9 | 397 | struct helper_data *data = transport->data; |
bfc366d9 | 398 | int cat_blob_fd, code; |
483bbd4e | 399 | child_process_init(fastimport); |
e65e91ed | 400 | fastimport->in = helper->out; |
173fd1a1 JK |
401 | argv_array_push(&fastimport->args, "fast-import"); |
402 | argv_array_push(&fastimport->args, debug ? "--stats" : "--quiet"); | |
e65e91ed | 403 | |
bfc366d9 FA |
404 | if (data->bidi_import) { |
405 | cat_blob_fd = xdup(helper->in); | |
173fd1a1 | 406 | argv_array_pushf(&fastimport->args, "--cat-blob-fd=%d", cat_blob_fd); |
bfc366d9 | 407 | } |
e65e91ed | 408 | fastimport->git_cmd = 1; |
bfc366d9 FA |
409 | |
410 | code = start_command(fastimport); | |
411 | return code; | |
e65e91ed DB |
412 | } |
413 | ||
73b49a75 SR |
414 | static int get_exporter(struct transport *transport, |
415 | struct child_process *fastexport, | |
73b49a75 SR |
416 | struct string_list *revlist_args) |
417 | { | |
a515ebe9 | 418 | struct helper_data *data = transport->data; |
73b49a75 | 419 | struct child_process *helper = get_helper(transport); |
2aeae40a | 420 | int i; |
852e54bc | 421 | |
73b49a75 SR |
422 | memset(fastexport, 0, sizeof(*fastexport)); |
423 | ||
424 | /* we need to duplicate helper->in because we want to use it after | |
425 | * fastexport is done with it. */ | |
426 | fastexport->out = dup(helper->in); | |
2aeae40a JK |
427 | argv_array_push(&fastexport->args, "fast-export"); |
428 | argv_array_push(&fastexport->args, "--use-done-feature"); | |
429 | argv_array_push(&fastexport->args, data->signed_tags ? | |
430 | "--signed-tags=verbatim" : "--signed-tags=warn-strip"); | |
431 | if (data->export_marks) | |
432 | argv_array_pushf(&fastexport->args, "--export-marks=%s.tmp", data->export_marks); | |
433 | if (data->import_marks) | |
434 | argv_array_pushf(&fastexport->args, "--import-marks=%s", data->import_marks); | |
73b49a75 SR |
435 | |
436 | for (i = 0; i < revlist_args->nr; i++) | |
2aeae40a | 437 | argv_array_push(&fastexport->args, revlist_args->items[i].string); |
73b49a75 SR |
438 | |
439 | fastexport->git_cmd = 1; | |
440 | return start_command(fastexport); | |
441 | } | |
442 | ||
e65e91ed DB |
443 | static int fetch_with_import(struct transport *transport, |
444 | int nr_heads, struct ref **to_fetch) | |
445 | { | |
446 | struct child_process fastimport; | |
72ff8943 | 447 | struct helper_data *data = transport->data; |
e65e91ed DB |
448 | int i; |
449 | struct ref *posn; | |
450 | struct strbuf buf = STRBUF_INIT; | |
451 | ||
bf3c523c IL |
452 | get_helper(transport); |
453 | ||
e65e91ed DB |
454 | if (get_importer(transport, &fastimport)) |
455 | die("Couldn't run fast-import"); | |
456 | ||
457 | for (i = 0; i < nr_heads; i++) { | |
458 | posn = to_fetch[i]; | |
459 | if (posn->status & REF_STATUS_UPTODATE) | |
460 | continue; | |
461 | ||
462 | strbuf_addf(&buf, "import %s\n", posn->name); | |
bf3c523c | 463 | sendline(data, &buf); |
e65e91ed DB |
464 | strbuf_reset(&buf); |
465 | } | |
9504bc9d SR |
466 | |
467 | write_constant(data->helper->in, "\n"); | |
bfc366d9 FA |
468 | /* |
469 | * remote-helpers that advertise the bidi-import capability are required to | |
470 | * buffer the complete batch of import commands until this newline before | |
471 | * sending data to fast-import. | |
472 | * These helpers read back data from fast-import on their stdin, which could | |
473 | * be mixed with import commands, otherwise. | |
474 | */ | |
9504bc9d | 475 | |
cc567322 SR |
476 | if (finish_command(&fastimport)) |
477 | die("Error while running fast-import"); | |
e65e91ed | 478 | |
dff9d65d FA |
479 | /* |
480 | * The fast-import stream of a remote helper that advertises | |
481 | * the "refspec" capability writes to the refs named after the | |
482 | * right hand side of the first refspec matching each ref we | |
483 | * were fetching. | |
484 | * | |
485 | * (If no "refspec" capability was specified, for historical | |
7a43c554 | 486 | * reasons we default to the equivalent of *:*.) |
dff9d65d FA |
487 | * |
488 | * Store the result in to_fetch[i].old_sha1. Callers such | |
489 | * as "git fetch" can use the value to write feedback to the | |
490 | * terminal, populate FETCH_HEAD, and determine what new value | |
491 | * should be written to peer_ref if the update is a | |
492 | * fast-forward or this is a forced update. | |
493 | */ | |
e65e91ed | 494 | for (i = 0; i < nr_heads; i++) { |
72ff8943 | 495 | char *private; |
e65e91ed DB |
496 | posn = to_fetch[i]; |
497 | if (posn->status & REF_STATUS_UPTODATE) | |
498 | continue; | |
72ff8943 DB |
499 | if (data->refspecs) |
500 | private = apply_refspecs(data->refspecs, data->refspec_nr, posn->name); | |
501 | else | |
c28cce55 | 502 | private = xstrdup(posn->name); |
d51b720f MH |
503 | if (private) { |
504 | read_ref(private, posn->old_sha1); | |
505 | free(private); | |
506 | } | |
e65e91ed | 507 | } |
b962dbdc | 508 | strbuf_release(&buf); |
e65e91ed DB |
509 | return 0; |
510 | } | |
511 | ||
fa8c097c IL |
512 | static int process_connect_service(struct transport *transport, |
513 | const char *name, const char *exec) | |
514 | { | |
515 | struct helper_data *data = transport->data; | |
516 | struct strbuf cmdbuf = STRBUF_INIT; | |
517 | struct child_process *helper; | |
518 | int r, duped, ret = 0; | |
519 | FILE *input; | |
520 | ||
521 | helper = get_helper(transport); | |
522 | ||
523 | /* | |
524 | * Yes, dup the pipe another time, as we need unbuffered version | |
525 | * of input pipe as FILE*. fclose() closes the underlying fd and | |
526 | * stream buffering only can be changed before first I/O operation | |
527 | * on it. | |
528 | */ | |
529 | duped = dup(helper->out); | |
530 | if (duped < 0) | |
531 | die_errno("Can't dup helper output fd"); | |
532 | input = xfdopen(duped, "r"); | |
533 | setvbuf(input, NULL, _IONBF, 0); | |
534 | ||
535 | /* | |
536 | * Handle --upload-pack and friends. This is fire and forget... | |
537 | * just warn if it fails. | |
538 | */ | |
539 | if (strcmp(name, exec)) { | |
540 | r = set_helper_option(transport, "servpath", exec); | |
541 | if (r > 0) | |
542 | warning("Setting remote service path not supported by protocol."); | |
543 | else if (r < 0) | |
544 | warning("Invalid remote service path."); | |
545 | } | |
546 | ||
547 | if (data->connect) | |
548 | strbuf_addf(&cmdbuf, "connect %s\n", name); | |
549 | else | |
550 | goto exit; | |
551 | ||
552 | sendline(data, &cmdbuf); | |
5931b33e FC |
553 | if (recvline_fh(input, &cmdbuf, name)) |
554 | exit(128); | |
555 | ||
fa8c097c IL |
556 | if (!strcmp(cmdbuf.buf, "")) { |
557 | data->no_disconnect_req = 1; | |
558 | if (debug) | |
559 | fprintf(stderr, "Debug: Smart transport connection " | |
560 | "ready.\n"); | |
561 | ret = 1; | |
562 | } else if (!strcmp(cmdbuf.buf, "fallback")) { | |
563 | if (debug) | |
564 | fprintf(stderr, "Debug: Falling back to dumb " | |
565 | "transport.\n"); | |
566 | } else | |
567 | die("Unknown response to connect: %s", | |
568 | cmdbuf.buf); | |
569 | ||
570 | exit: | |
571 | fclose(input); | |
572 | return ret; | |
573 | } | |
574 | ||
575 | static int process_connect(struct transport *transport, | |
576 | int for_push) | |
577 | { | |
578 | struct helper_data *data = transport->data; | |
579 | const char *name; | |
580 | const char *exec; | |
581 | ||
582 | name = for_push ? "git-receive-pack" : "git-upload-pack"; | |
583 | if (for_push) | |
584 | exec = data->transport_options.receivepack; | |
585 | else | |
586 | exec = data->transport_options.uploadpack; | |
587 | ||
588 | return process_connect_service(transport, name, exec); | |
589 | } | |
590 | ||
b236752a IL |
591 | static int connect_helper(struct transport *transport, const char *name, |
592 | const char *exec, int fd[2]) | |
593 | { | |
594 | struct helper_data *data = transport->data; | |
595 | ||
596 | /* Get_helper so connect is inited. */ | |
597 | get_helper(transport); | |
598 | if (!data->connect) | |
599 | die("Operation not supported by protocol."); | |
600 | ||
601 | if (!process_connect_service(transport, name, exec)) | |
602 | die("Can't connect to subservice %s.", name); | |
603 | ||
604 | fd[0] = data->helper->out; | |
605 | fd[1] = data->helper->in; | |
606 | return 0; | |
607 | } | |
608 | ||
6eb996b5 | 609 | static int fetch(struct transport *transport, |
37148311 | 610 | int nr_heads, struct ref **to_fetch) |
6eb996b5 DB |
611 | { |
612 | struct helper_data *data = transport->data; | |
613 | int i, count; | |
614 | ||
fa8c097c IL |
615 | if (process_connect(transport, 0)) { |
616 | do_take_over(transport); | |
617 | return transport->fetch(transport, nr_heads, to_fetch); | |
618 | } | |
619 | ||
6eb996b5 DB |
620 | count = 0; |
621 | for (i = 0; i < nr_heads; i++) | |
622 | if (!(to_fetch[i]->status & REF_STATUS_UPTODATE)) | |
623 | count++; | |
624 | ||
625 | if (!count) | |
626 | return 0; | |
627 | ||
628 | if (data->fetch) | |
629 | return fetch_with_fetch(transport, nr_heads, to_fetch); | |
630 | ||
e65e91ed DB |
631 | if (data->import) |
632 | return fetch_with_import(transport, nr_heads, to_fetch); | |
633 | ||
6eb996b5 DB |
634 | return -1; |
635 | } | |
636 | ||
664059fb | 637 | static int push_update_ref_status(struct strbuf *buf, |
d2e73c6f SR |
638 | struct ref **ref, |
639 | struct ref *remote_refs) | |
640 | { | |
641 | char *refname, *msg; | |
f9e3c6be | 642 | int status, forced = 0; |
d2e73c6f | 643 | |
59556548 | 644 | if (starts_with(buf->buf, "ok ")) { |
d2e73c6f SR |
645 | status = REF_STATUS_OK; |
646 | refname = buf->buf + 3; | |
59556548 | 647 | } else if (starts_with(buf->buf, "error ")) { |
d2e73c6f SR |
648 | status = REF_STATUS_REMOTE_REJECT; |
649 | refname = buf->buf + 6; | |
650 | } else | |
82247e9b | 651 | die("expected ok/error, helper said '%s'", buf->buf); |
d2e73c6f SR |
652 | |
653 | msg = strchr(refname, ' '); | |
654 | if (msg) { | |
655 | struct strbuf msg_buf = STRBUF_INIT; | |
656 | const char *end; | |
657 | ||
658 | *msg++ = '\0'; | |
659 | if (!unquote_c_style(&msg_buf, msg, &end)) | |
660 | msg = strbuf_detach(&msg_buf, NULL); | |
661 | else | |
662 | msg = xstrdup(msg); | |
663 | strbuf_release(&msg_buf); | |
664 | ||
665 | if (!strcmp(msg, "no match")) { | |
666 | status = REF_STATUS_NONE; | |
667 | free(msg); | |
668 | msg = NULL; | |
669 | } | |
670 | else if (!strcmp(msg, "up to date")) { | |
671 | status = REF_STATUS_UPTODATE; | |
672 | free(msg); | |
673 | msg = NULL; | |
674 | } | |
675 | else if (!strcmp(msg, "non-fast forward")) { | |
676 | status = REF_STATUS_REJECT_NONFASTFORWARD; | |
677 | free(msg); | |
678 | msg = NULL; | |
679 | } | |
dbfeddb1 CR |
680 | else if (!strcmp(msg, "already exists")) { |
681 | status = REF_STATUS_REJECT_ALREADY_EXISTS; | |
682 | free(msg); | |
683 | msg = NULL; | |
684 | } | |
75e5c0dc JH |
685 | else if (!strcmp(msg, "fetch first")) { |
686 | status = REF_STATUS_REJECT_FETCH_FIRST; | |
687 | free(msg); | |
688 | msg = NULL; | |
689 | } | |
690 | else if (!strcmp(msg, "needs force")) { | |
691 | status = REF_STATUS_REJECT_NEEDS_FORCE; | |
692 | free(msg); | |
693 | msg = NULL; | |
694 | } | |
631b5ef2 JH |
695 | else if (!strcmp(msg, "stale info")) { |
696 | status = REF_STATUS_REJECT_STALE; | |
697 | free(msg); | |
698 | msg = NULL; | |
699 | } | |
f9e3c6be FC |
700 | else if (!strcmp(msg, "forced update")) { |
701 | forced = 1; | |
702 | free(msg); | |
703 | msg = NULL; | |
704 | } | |
d2e73c6f SR |
705 | } |
706 | ||
707 | if (*ref) | |
708 | *ref = find_ref_by_name(*ref, refname); | |
709 | if (!*ref) | |
710 | *ref = find_ref_by_name(remote_refs, refname); | |
711 | if (!*ref) { | |
712 | warning("helper reported unexpected status of %s", refname); | |
664059fb | 713 | return 1; |
d2e73c6f SR |
714 | } |
715 | ||
716 | if ((*ref)->status != REF_STATUS_NONE) { | |
717 | /* | |
718 | * Earlier, the ref was marked not to be pushed, so ignore the ref | |
719 | * status reported by the remote helper if the latter is 'no match'. | |
720 | */ | |
721 | if (status == REF_STATUS_NONE) | |
664059fb | 722 | return 1; |
d2e73c6f SR |
723 | } |
724 | ||
725 | (*ref)->status = status; | |
cf31f70c | 726 | (*ref)->forced_update |= forced; |
d2e73c6f | 727 | (*ref)->remote_status = msg; |
126aac5c | 728 | return !(status == REF_STATUS_OK); |
d2e73c6f SR |
729 | } |
730 | ||
0551a06c | 731 | static int push_update_refs_status(struct helper_data *data, |
5a75353f FC |
732 | struct ref *remote_refs, |
733 | int flags) | |
d2e73c6f SR |
734 | { |
735 | struct strbuf buf = STRBUF_INIT; | |
736 | struct ref *ref = remote_refs; | |
0551a06c FC |
737 | int ret = 0; |
738 | ||
d2e73c6f | 739 | for (;;) { |
664059fb FC |
740 | char *private; |
741 | ||
0551a06c FC |
742 | if (recvline(data, &buf)) { |
743 | ret = 1; | |
744 | break; | |
745 | } | |
746 | ||
d2e73c6f SR |
747 | if (!buf.len) |
748 | break; | |
749 | ||
664059fb FC |
750 | if (push_update_ref_status(&buf, &ref, remote_refs)) |
751 | continue; | |
752 | ||
5a75353f | 753 | if (flags & TRANSPORT_PUSH_DRY_RUN || !data->refspecs || data->no_private_update) |
664059fb FC |
754 | continue; |
755 | ||
756 | /* propagate back the update to the remote namespace */ | |
757 | private = apply_refspecs(data->refspecs, data->refspec_nr, ref->name); | |
758 | if (!private) | |
759 | continue; | |
760 | update_ref("update by helper", private, ref->new_sha1, NULL, 0, 0); | |
761 | free(private); | |
d2e73c6f SR |
762 | } |
763 | strbuf_release(&buf); | |
0551a06c | 764 | return ret; |
d2e73c6f SR |
765 | } |
766 | ||
73b49a75 | 767 | static int push_refs_with_push(struct transport *transport, |
05c1eb10 | 768 | struct ref *remote_refs, int flags) |
ae4efe19 SP |
769 | { |
770 | int force_all = flags & TRANSPORT_PUSH_FORCE; | |
771 | int mirror = flags & TRANSPORT_PUSH_MIRROR; | |
772 | struct helper_data *data = transport->data; | |
773 | struct strbuf buf = STRBUF_INIT; | |
ae4efe19 | 774 | struct ref *ref; |
05c1eb10 JH |
775 | struct string_list cas_options = STRING_LIST_INIT_DUP; |
776 | struct string_list_item *cas_option; | |
ae4efe19 | 777 | |
c0aa335c | 778 | get_helper(transport); |
ae4efe19 SP |
779 | if (!data->push) |
780 | return 1; | |
781 | ||
782 | for (ref = remote_refs; ref; ref = ref->next) { | |
20e8b465 | 783 | if (!ref->peer_ref && !mirror) |
ae4efe19 SP |
784 | continue; |
785 | ||
20e8b465 TRC |
786 | /* Check for statuses set by set_ref_status_for_push() */ |
787 | switch (ref->status) { | |
788 | case REF_STATUS_REJECT_NONFASTFORWARD: | |
631b5ef2 | 789 | case REF_STATUS_REJECT_STALE: |
dbfeddb1 | 790 | case REF_STATUS_REJECT_ALREADY_EXISTS: |
20e8b465 | 791 | case REF_STATUS_UPTODATE: |
ae4efe19 | 792 | continue; |
20e8b465 TRC |
793 | default: |
794 | ; /* do nothing */ | |
ae4efe19 SP |
795 | } |
796 | ||
797 | if (force_all) | |
798 | ref->force = 1; | |
799 | ||
800 | strbuf_addstr(&buf, "push "); | |
801 | if (!ref->deletion) { | |
802 | if (ref->force) | |
803 | strbuf_addch(&buf, '+'); | |
804 | if (ref->peer_ref) | |
805 | strbuf_addstr(&buf, ref->peer_ref->name); | |
806 | else | |
807 | strbuf_addstr(&buf, sha1_to_hex(ref->new_sha1)); | |
808 | } | |
809 | strbuf_addch(&buf, ':'); | |
810 | strbuf_addstr(&buf, ref->name); | |
811 | strbuf_addch(&buf, '\n'); | |
05c1eb10 JH |
812 | |
813 | /* | |
814 | * The "--force-with-lease" options without explicit | |
815 | * values to expect have already been expanded into | |
816 | * the ref->old_sha1_expect[] field; we can ignore | |
817 | * transport->smart_options->cas altogether and instead | |
818 | * can enumerate them from the refs. | |
819 | */ | |
820 | if (ref->expect_old_sha1) { | |
821 | struct strbuf cas = STRBUF_INIT; | |
822 | strbuf_addf(&cas, "%s:%s", | |
823 | ref->name, sha1_to_hex(ref->old_sha1_expect)); | |
824 | string_list_append(&cas_options, strbuf_detach(&cas, NULL)); | |
825 | } | |
ae4efe19 | 826 | } |
05c1eb10 JH |
827 | if (buf.len == 0) { |
828 | string_list_clear(&cas_options, 0); | |
d8f67d20 | 829 | return 0; |
05c1eb10 | 830 | } |
ae4efe19 | 831 | |
ae4efe19 | 832 | standard_options(transport); |
05c1eb10 JH |
833 | for_each_string_list_item(cas_option, &cas_options) |
834 | set_helper_option(transport, "cas", cas_option->string); | |
ae4efe19 SP |
835 | |
836 | if (flags & TRANSPORT_PUSH_DRY_RUN) { | |
837 | if (set_helper_option(transport, "dry-run", "true") != 0) | |
838 | die("helper %s does not support dry-run", data->name); | |
839 | } | |
840 | ||
841 | strbuf_addch(&buf, '\n'); | |
bf3c523c | 842 | sendline(data, &buf); |
ae4efe19 | 843 | strbuf_release(&buf); |
d2e73c6f | 844 | |
0551a06c | 845 | return push_update_refs_status(data, remote_refs, flags); |
ae4efe19 SP |
846 | } |
847 | ||
73b49a75 SR |
848 | static int push_refs_with_export(struct transport *transport, |
849 | struct ref *remote_refs, int flags) | |
850 | { | |
851 | struct ref *ref; | |
852 | struct child_process *helper, exporter; | |
853 | struct helper_data *data = transport->data; | |
d98c8153 | 854 | struct string_list revlist_args = STRING_LIST_INIT_DUP; |
73b49a75 SR |
855 | struct strbuf buf = STRBUF_INIT; |
856 | ||
21610d82 FC |
857 | if (!data->refspecs) |
858 | die("remote-helper doesn't support push; refspec needed"); | |
859 | ||
21457f57 FC |
860 | if (flags & TRANSPORT_PUSH_DRY_RUN) { |
861 | if (set_helper_option(transport, "dry-run", "true") != 0) | |
862 | die("helper %s does not support dry-run", data->name); | |
863 | } | |
864 | ||
510fa6f5 FC |
865 | if (flags & TRANSPORT_PUSH_FORCE) { |
866 | if (set_helper_option(transport, "force", "true") != 0) | |
867 | warning("helper %s does not support 'force'", data->name); | |
868 | } | |
869 | ||
73b49a75 SR |
870 | helper = get_helper(transport); |
871 | ||
872 | write_constant(helper->in, "export\n"); | |
873 | ||
73b49a75 SR |
874 | for (ref = remote_refs; ref; ref = ref->next) { |
875 | char *private; | |
876 | unsigned char sha1[20]; | |
877 | ||
73b49a75 SR |
878 | private = apply_refspecs(data->refspecs, data->refspec_nr, ref->name); |
879 | if (private && !get_sha1(private, sha1)) { | |
880 | strbuf_addf(&buf, "^%s", private); | |
1d2f80fa | 881 | string_list_append(&revlist_args, strbuf_detach(&buf, NULL)); |
b056620f | 882 | hashcpy(ref->old_sha1, sha1); |
73b49a75 | 883 | } |
2faa1527 | 884 | free(private); |
73b49a75 | 885 | |
67c9c782 | 886 | if (ref->peer_ref) { |
d98c8153 | 887 | if (strcmp(ref->name, ref->peer_ref->name)) { |
f3d03763 FC |
888 | if (!ref->deletion) { |
889 | const char *name; | |
890 | int flag; | |
891 | ||
892 | /* Follow symbolic refs (mainly for HEAD). */ | |
893 | name = resolve_ref_unsafe(ref->peer_ref->name, sha1, 1, &flag); | |
894 | if (!name || !(flag & REF_ISSYMREF)) | |
895 | name = ref->peer_ref->name; | |
9193f742 | 896 | |
f3d03763 FC |
897 | strbuf_addf(&buf, "%s:%s", name, ref->name); |
898 | } else | |
899 | strbuf_addf(&buf, ":%s", ref->name); | |
9193f742 | 900 | |
d98c8153 FC |
901 | string_list_append(&revlist_args, "--refspec"); |
902 | string_list_append(&revlist_args, buf.buf); | |
903 | strbuf_release(&buf); | |
904 | } | |
f3d03763 FC |
905 | if (!ref->deletion) |
906 | string_list_append(&revlist_args, ref->peer_ref->name); | |
67c9c782 | 907 | } |
73b49a75 SR |
908 | } |
909 | ||
a515ebe9 | 910 | if (get_exporter(transport, &exporter, &revlist_args)) |
73b49a75 SR |
911 | die("Couldn't run fast-export"); |
912 | ||
d98c8153 FC |
913 | string_list_clear(&revlist_args, 1); |
914 | ||
cc567322 SR |
915 | if (finish_command(&exporter)) |
916 | die("Error while running fast-export"); | |
3994e64d FC |
917 | if (push_update_refs_status(data, remote_refs, flags)) |
918 | return 1; | |
919 | ||
920 | if (data->export_marks) { | |
921 | strbuf_addf(&buf, "%s.tmp", data->export_marks); | |
922 | rename(buf.buf, data->export_marks); | |
923 | strbuf_release(&buf); | |
924 | } | |
925 | ||
926 | return 0; | |
73b49a75 SR |
927 | } |
928 | ||
929 | static int push_refs(struct transport *transport, | |
930 | struct ref *remote_refs, int flags) | |
931 | { | |
932 | struct helper_data *data = transport->data; | |
933 | ||
934 | if (process_connect(transport, 1)) { | |
935 | do_take_over(transport); | |
936 | return transport->push_refs(transport, remote_refs, flags); | |
937 | } | |
938 | ||
939 | if (!remote_refs) { | |
940 | fprintf(stderr, "No refs in common and none specified; doing nothing.\n" | |
941 | "Perhaps you should specify a branch such as 'master'.\n"); | |
942 | return 0; | |
943 | } | |
944 | ||
945 | if (data->push) | |
946 | return push_refs_with_push(transport, remote_refs, flags); | |
947 | ||
948 | if (data->export) | |
949 | return push_refs_with_export(transport, remote_refs, flags); | |
950 | ||
951 | return -1; | |
952 | } | |
953 | ||
954 | ||
f8ec9167 DB |
955 | static int has_attribute(const char *attrs, const char *attr) { |
956 | int len; | |
957 | if (!attrs) | |
958 | return 0; | |
959 | ||
960 | len = strlen(attr); | |
961 | for (;;) { | |
962 | const char *space = strchrnul(attrs, ' '); | |
963 | if (len == space - attrs && !strncmp(attrs, attr, len)) | |
964 | return 1; | |
965 | if (!*space) | |
966 | return 0; | |
967 | attrs = space + 1; | |
968 | } | |
969 | } | |
970 | ||
6eb996b5 DB |
971 | static struct ref *get_refs_list(struct transport *transport, int for_push) |
972 | { | |
292ce46b | 973 | struct helper_data *data = transport->data; |
6eb996b5 DB |
974 | struct child_process *helper; |
975 | struct ref *ret = NULL; | |
976 | struct ref **tail = &ret; | |
977 | struct ref *posn; | |
978 | struct strbuf buf = STRBUF_INIT; | |
6eb996b5 DB |
979 | |
980 | helper = get_helper(transport); | |
2d14d65c | 981 | |
fa8c097c IL |
982 | if (process_connect(transport, for_push)) { |
983 | do_take_over(transport); | |
984 | return transport->get_refs_list(transport, for_push); | |
985 | } | |
986 | ||
ae4efe19 SP |
987 | if (data->push && for_push) |
988 | write_str_in_full(helper->in, "list for-push\n"); | |
989 | else | |
990 | write_str_in_full(helper->in, "list\n"); | |
6eb996b5 | 991 | |
6eb996b5 DB |
992 | while (1) { |
993 | char *eov, *eon; | |
5931b33e FC |
994 | if (recvline(data, &buf)) |
995 | exit(128); | |
6eb996b5 DB |
996 | |
997 | if (!*buf.buf) | |
998 | break; | |
999 | ||
1000 | eov = strchr(buf.buf, ' '); | |
1001 | if (!eov) | |
1002 | die("Malformed response in ref list: %s", buf.buf); | |
1003 | eon = strchr(eov + 1, ' '); | |
1004 | *eov = '\0'; | |
1005 | if (eon) | |
1006 | *eon = '\0'; | |
1007 | *tail = alloc_ref(eov + 1); | |
1008 | if (buf.buf[0] == '@') | |
1009 | (*tail)->symref = xstrdup(buf.buf + 1); | |
1010 | else if (buf.buf[0] != '?') | |
1011 | get_sha1_hex(buf.buf, (*tail)->old_sha1); | |
f8ec9167 DB |
1012 | if (eon) { |
1013 | if (has_attribute(eon + 1, "unchanged")) { | |
1014 | (*tail)->status |= REF_STATUS_UPTODATE; | |
1015 | read_ref((*tail)->name, (*tail)->old_sha1); | |
1016 | } | |
1017 | } | |
6eb996b5 DB |
1018 | tail = &((*tail)->next); |
1019 | } | |
bf3c523c IL |
1020 | if (debug) |
1021 | fprintf(stderr, "Debug: Read ref listing.\n"); | |
6eb996b5 DB |
1022 | strbuf_release(&buf); |
1023 | ||
1024 | for (posn = ret; posn; posn = posn->next) | |
1025 | resolve_remote_symref(posn, ret); | |
1026 | ||
1027 | return ret; | |
1028 | } | |
1029 | ||
c9e388bb | 1030 | int transport_helper_init(struct transport *transport, const char *name) |
6eb996b5 | 1031 | { |
92e25b6b | 1032 | struct helper_data *data = xcalloc(1, sizeof(*data)); |
c9e388bb | 1033 | data->name = name; |
6eb996b5 | 1034 | |
bf3c523c IL |
1035 | if (getenv("GIT_TRANSPORT_HELPER_DEBUG")) |
1036 | debug = 1; | |
1037 | ||
6eb996b5 | 1038 | transport->data = data; |
ef08ef9e | 1039 | transport->set_option = set_helper_option; |
6eb996b5 DB |
1040 | transport->get_refs_list = get_refs_list; |
1041 | transport->fetch = fetch; | |
ae4efe19 | 1042 | transport->push_refs = push_refs; |
f2a37151 | 1043 | transport->disconnect = release_helper; |
b236752a | 1044 | transport->connect = connect_helper; |
61b075bd | 1045 | transport->smart_options = &(data->transport_options); |
6eb996b5 DB |
1046 | return 0; |
1047 | } | |
419f37db IL |
1048 | |
1049 | /* | |
1050 | * Linux pipes can buffer 65536 bytes at once (and most platforms can | |
1051 | * buffer less), so attempt reads and writes with up to that size. | |
1052 | */ | |
1053 | #define BUFFERSIZE 65536 | |
1054 | /* This should be enough to hold debugging message. */ | |
1055 | #define PBUFFERSIZE 8192 | |
1056 | ||
1057 | /* Print bidirectional transfer loop debug message. */ | |
4621085b | 1058 | __attribute__((format (printf, 1, 2))) |
419f37db IL |
1059 | static void transfer_debug(const char *fmt, ...) |
1060 | { | |
1061 | va_list args; | |
1062 | char msgbuf[PBUFFERSIZE]; | |
1063 | static int debug_enabled = -1; | |
1064 | ||
1065 | if (debug_enabled < 0) | |
1066 | debug_enabled = getenv("GIT_TRANSLOOP_DEBUG") ? 1 : 0; | |
1067 | if (!debug_enabled) | |
1068 | return; | |
1069 | ||
1070 | va_start(args, fmt); | |
1071 | vsnprintf(msgbuf, PBUFFERSIZE, fmt, args); | |
1072 | va_end(args); | |
1073 | fprintf(stderr, "Transfer loop debugging: %s\n", msgbuf); | |
1074 | } | |
1075 | ||
1076 | /* Stream state: More data may be coming in this direction. */ | |
1077 | #define SSTATE_TRANSFERING 0 | |
1078 | /* | |
1079 | * Stream state: No more data coming in this direction, flushing rest of | |
1080 | * data. | |
1081 | */ | |
1082 | #define SSTATE_FLUSHING 1 | |
1083 | /* Stream state: Transfer in this direction finished. */ | |
1084 | #define SSTATE_FINISHED 2 | |
1085 | ||
1086 | #define STATE_NEEDS_READING(state) ((state) <= SSTATE_TRANSFERING) | |
1087 | #define STATE_NEEDS_WRITING(state) ((state) <= SSTATE_FLUSHING) | |
1088 | #define STATE_NEEDS_CLOSING(state) ((state) == SSTATE_FLUSHING) | |
1089 | ||
1090 | /* Unidirectional transfer. */ | |
1091 | struct unidirectional_transfer { | |
1092 | /* Source */ | |
1093 | int src; | |
1094 | /* Destination */ | |
1095 | int dest; | |
1096 | /* Is source socket? */ | |
1097 | int src_is_sock; | |
1098 | /* Is destination socket? */ | |
1099 | int dest_is_sock; | |
41ccfdd9 | 1100 | /* Transfer state (TRANSFERRING/FLUSHING/FINISHED) */ |
419f37db IL |
1101 | int state; |
1102 | /* Buffer. */ | |
1103 | char buf[BUFFERSIZE]; | |
1104 | /* Buffer used. */ | |
1105 | size_t bufuse; | |
1106 | /* Name of source. */ | |
1107 | const char *src_name; | |
1108 | /* Name of destination. */ | |
1109 | const char *dest_name; | |
1110 | }; | |
1111 | ||
1112 | /* Closes the target (for writing) if transfer has finished. */ | |
1113 | static void udt_close_if_finished(struct unidirectional_transfer *t) | |
1114 | { | |
1115 | if (STATE_NEEDS_CLOSING(t->state) && !t->bufuse) { | |
1116 | t->state = SSTATE_FINISHED; | |
1117 | if (t->dest_is_sock) | |
1118 | shutdown(t->dest, SHUT_WR); | |
1119 | else | |
1120 | close(t->dest); | |
1121 | transfer_debug("Closed %s.", t->dest_name); | |
1122 | } | |
1123 | } | |
1124 | ||
1125 | /* | |
1126 | * Tries to read read data from source into buffer. If buffer is full, | |
1127 | * no data is read. Returns 0 on success, -1 on error. | |
1128 | */ | |
1129 | static int udt_do_read(struct unidirectional_transfer *t) | |
1130 | { | |
1131 | ssize_t bytes; | |
1132 | ||
1133 | if (t->bufuse == BUFFERSIZE) | |
1134 | return 0; /* No space for more. */ | |
1135 | ||
1136 | transfer_debug("%s is readable", t->src_name); | |
1137 | bytes = read(t->src, t->buf + t->bufuse, BUFFERSIZE - t->bufuse); | |
1138 | if (bytes < 0 && errno != EWOULDBLOCK && errno != EAGAIN && | |
1139 | errno != EINTR) { | |
1140 | error("read(%s) failed: %s", t->src_name, strerror(errno)); | |
1141 | return -1; | |
1142 | } else if (bytes == 0) { | |
1143 | transfer_debug("%s EOF (with %i bytes in buffer)", | |
4621085b | 1144 | t->src_name, (int)t->bufuse); |
419f37db IL |
1145 | t->state = SSTATE_FLUSHING; |
1146 | } else if (bytes > 0) { | |
1147 | t->bufuse += bytes; | |
1148 | transfer_debug("Read %i bytes from %s (buffer now at %i)", | |
1149 | (int)bytes, t->src_name, (int)t->bufuse); | |
1150 | } | |
1151 | return 0; | |
1152 | } | |
1153 | ||
1154 | /* Tries to write data from buffer into destination. If buffer is empty, | |
1155 | * no data is written. Returns 0 on success, -1 on error. | |
1156 | */ | |
1157 | static int udt_do_write(struct unidirectional_transfer *t) | |
1158 | { | |
803dbdb9 | 1159 | ssize_t bytes; |
419f37db IL |
1160 | |
1161 | if (t->bufuse == 0) | |
1162 | return 0; /* Nothing to write. */ | |
1163 | ||
1164 | transfer_debug("%s is writable", t->dest_name); | |
7edc02f4 EFL |
1165 | bytes = xwrite(t->dest, t->buf, t->bufuse); |
1166 | if (bytes < 0 && errno != EWOULDBLOCK) { | |
419f37db IL |
1167 | error("write(%s) failed: %s", t->dest_name, strerror(errno)); |
1168 | return -1; | |
1169 | } else if (bytes > 0) { | |
1170 | t->bufuse -= bytes; | |
1171 | if (t->bufuse) | |
1172 | memmove(t->buf, t->buf + bytes, t->bufuse); | |
1173 | transfer_debug("Wrote %i bytes to %s (buffer now at %i)", | |
1174 | (int)bytes, t->dest_name, (int)t->bufuse); | |
1175 | } | |
1176 | return 0; | |
1177 | } | |
1178 | ||
1179 | ||
1180 | /* State of bidirectional transfer loop. */ | |
1181 | struct bidirectional_transfer_state { | |
1182 | /* Direction from program to git. */ | |
1183 | struct unidirectional_transfer ptg; | |
1184 | /* Direction from git to program. */ | |
1185 | struct unidirectional_transfer gtp; | |
1186 | }; | |
1187 | ||
1188 | static void *udt_copy_task_routine(void *udt) | |
1189 | { | |
1190 | struct unidirectional_transfer *t = (struct unidirectional_transfer *)udt; | |
1191 | while (t->state != SSTATE_FINISHED) { | |
1192 | if (STATE_NEEDS_READING(t->state)) | |
1193 | if (udt_do_read(t)) | |
1194 | return NULL; | |
1195 | if (STATE_NEEDS_WRITING(t->state)) | |
1196 | if (udt_do_write(t)) | |
1197 | return NULL; | |
1198 | if (STATE_NEEDS_CLOSING(t->state)) | |
1199 | udt_close_if_finished(t); | |
1200 | } | |
1201 | return udt; /* Just some non-NULL value. */ | |
1202 | } | |
1203 | ||
1204 | #ifndef NO_PTHREADS | |
1205 | ||
1206 | /* | |
98e023de | 1207 | * Join thread, with appropriate errors on failure. Name is name for the |
419f37db IL |
1208 | * thread (for error messages). Returns 0 on success, 1 on failure. |
1209 | */ | |
1210 | static int tloop_join(pthread_t thread, const char *name) | |
1211 | { | |
1212 | int err; | |
1213 | void *tret; | |
1214 | err = pthread_join(thread, &tret); | |
1215 | if (!tret) { | |
1216 | error("%s thread failed", name); | |
1217 | return 1; | |
1218 | } | |
1219 | if (err) { | |
1220 | error("%s thread failed to join: %s", name, strerror(err)); | |
1221 | return 1; | |
1222 | } | |
1223 | return 0; | |
1224 | } | |
1225 | ||
1226 | /* | |
1227 | * Spawn the transfer tasks and then wait for them. Returns 0 on success, | |
1228 | * -1 on failure. | |
1229 | */ | |
1230 | static int tloop_spawnwait_tasks(struct bidirectional_transfer_state *s) | |
1231 | { | |
1232 | pthread_t gtp_thread; | |
1233 | pthread_t ptg_thread; | |
1234 | int err; | |
1235 | int ret = 0; | |
1236 | err = pthread_create(>p_thread, NULL, udt_copy_task_routine, | |
1237 | &s->gtp); | |
1238 | if (err) | |
1239 | die("Can't start thread for copying data: %s", strerror(err)); | |
1240 | err = pthread_create(&ptg_thread, NULL, udt_copy_task_routine, | |
1241 | &s->ptg); | |
1242 | if (err) | |
1243 | die("Can't start thread for copying data: %s", strerror(err)); | |
1244 | ||
1245 | ret |= tloop_join(gtp_thread, "Git to program copy"); | |
1246 | ret |= tloop_join(ptg_thread, "Program to git copy"); | |
1247 | return ret; | |
1248 | } | |
1249 | #else | |
1250 | ||
1251 | /* Close the source and target (for writing) for transfer. */ | |
1252 | static void udt_kill_transfer(struct unidirectional_transfer *t) | |
1253 | { | |
1254 | t->state = SSTATE_FINISHED; | |
1255 | /* | |
1256 | * Socket read end left open isn't a disaster if nobody | |
1257 | * attempts to read from it (mingw compat headers do not | |
1258 | * have SHUT_RD)... | |
1259 | * | |
1260 | * We can't fully close the socket since otherwise gtp | |
1261 | * task would first close the socket it sends data to | |
1262 | * while closing the ptg file descriptors. | |
1263 | */ | |
1264 | if (!t->src_is_sock) | |
1265 | close(t->src); | |
1266 | if (t->dest_is_sock) | |
1267 | shutdown(t->dest, SHUT_WR); | |
1268 | else | |
1269 | close(t->dest); | |
1270 | } | |
1271 | ||
1272 | /* | |
98e023de | 1273 | * Join process, with appropriate errors on failure. Name is name for the |
419f37db IL |
1274 | * process (for error messages). Returns 0 on success, 1 on failure. |
1275 | */ | |
1276 | static int tloop_join(pid_t pid, const char *name) | |
1277 | { | |
1278 | int tret; | |
1279 | if (waitpid(pid, &tret, 0) < 0) { | |
1280 | error("%s process failed to wait: %s", name, strerror(errno)); | |
1281 | return 1; | |
1282 | } | |
1283 | if (!WIFEXITED(tret) || WEXITSTATUS(tret)) { | |
1284 | error("%s process failed", name); | |
1285 | return 1; | |
1286 | } | |
1287 | return 0; | |
1288 | } | |
1289 | ||
1290 | /* | |
1291 | * Spawn the transfer tasks and then wait for them. Returns 0 on success, | |
1292 | * -1 on failure. | |
1293 | */ | |
1294 | static int tloop_spawnwait_tasks(struct bidirectional_transfer_state *s) | |
1295 | { | |
1296 | pid_t pid1, pid2; | |
1297 | int ret = 0; | |
1298 | ||
1299 | /* Fork thread #1: git to program. */ | |
1300 | pid1 = fork(); | |
1301 | if (pid1 < 0) | |
1302 | die_errno("Can't start thread for copying data"); | |
1303 | else if (pid1 == 0) { | |
1304 | udt_kill_transfer(&s->ptg); | |
1305 | exit(udt_copy_task_routine(&s->gtp) ? 0 : 1); | |
1306 | } | |
1307 | ||
1308 | /* Fork thread #2: program to git. */ | |
1309 | pid2 = fork(); | |
1310 | if (pid2 < 0) | |
1311 | die_errno("Can't start thread for copying data"); | |
1312 | else if (pid2 == 0) { | |
1313 | udt_kill_transfer(&s->gtp); | |
1314 | exit(udt_copy_task_routine(&s->ptg) ? 0 : 1); | |
1315 | } | |
1316 | ||
1317 | /* | |
1318 | * Close both streams in parent as to not interfere with | |
1319 | * end of file detection and wait for both tasks to finish. | |
1320 | */ | |
1321 | udt_kill_transfer(&s->gtp); | |
1322 | udt_kill_transfer(&s->ptg); | |
1323 | ret |= tloop_join(pid1, "Git to program copy"); | |
1324 | ret |= tloop_join(pid2, "Program to git copy"); | |
1325 | return ret; | |
1326 | } | |
1327 | #endif | |
1328 | ||
1329 | /* | |
1330 | * Copies data from stdin to output and from input to stdout simultaneously. | |
1331 | * Additionally filtering through given filter. If filter is NULL, uses | |
1332 | * identity filter. | |
1333 | */ | |
1334 | int bidirectional_transfer_loop(int input, int output) | |
1335 | { | |
1336 | struct bidirectional_transfer_state state; | |
1337 | ||
1338 | /* Fill the state fields. */ | |
1339 | state.ptg.src = input; | |
1340 | state.ptg.dest = 1; | |
1341 | state.ptg.src_is_sock = (input == output); | |
1342 | state.ptg.dest_is_sock = 0; | |
1343 | state.ptg.state = SSTATE_TRANSFERING; | |
1344 | state.ptg.bufuse = 0; | |
1345 | state.ptg.src_name = "remote input"; | |
1346 | state.ptg.dest_name = "stdout"; | |
1347 | ||
1348 | state.gtp.src = 0; | |
1349 | state.gtp.dest = output; | |
1350 | state.gtp.src_is_sock = 0; | |
1351 | state.gtp.dest_is_sock = (input == output); | |
1352 | state.gtp.state = SSTATE_TRANSFERING; | |
1353 | state.gtp.bufuse = 0; | |
1354 | state.gtp.src_name = "stdin"; | |
1355 | state.gtp.dest_name = "remote output"; | |
1356 | ||
1357 | return tloop_spawnwait_tasks(&state); | |
1358 | } |