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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; |
6eb996b5 DB |
111 | |
112 | if (data->helper) | |
113 | return data->helper; | |
114 | ||
483bbd4e RS |
115 | helper = xmalloc(sizeof(*helper)); |
116 | child_process_init(helper); | |
6eb996b5 DB |
117 | helper->in = -1; |
118 | helper->out = -1; | |
119 | helper->err = 0; | |
e0ab2ac6 JK |
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)); | |
6b02de3b IL |
123 | helper->git_cmd = 0; |
124 | helper->silent_exec_failure = 1; | |
e1735872 | 125 | |
a9154590 RS |
126 | argv_array_pushf(&helper->env_array, "%s=%s", GIT_DIR_ENVIRONMENT, |
127 | get_git_dir()); | |
e1735872 | 128 | |
6b02de3b IL |
129 | code = start_command(helper); |
130 | if (code < 0 && errno == ENOENT) | |
131 | die("Unable to find remote helper for '%s'", data->name); | |
132 | else if (code != 0) | |
133 | exit(code); | |
134 | ||
6eb996b5 | 135 | data->helper = helper; |
fa8c097c | 136 | data->no_disconnect_req = 0; |
6eb996b5 | 137 | |
61b075bd IL |
138 | /* |
139 | * Open the output as FILE* so strbuf_getline() can be used. | |
140 | * Do this with duped fd because fclose() will close the fd, | |
141 | * and stuff like taking over will require the fd to remain. | |
61b075bd IL |
142 | */ |
143 | duped = dup(helper->out); | |
144 | if (duped < 0) | |
145 | die_errno("Can't dup helper output fd"); | |
146 | data->out = xfdopen(duped, "r"); | |
147 | ||
bf3c523c | 148 | write_constant(helper->in, "capabilities\n"); |
2d14d65c | 149 | |
6eb996b5 | 150 | while (1) { |
21a2d4ad | 151 | const char *capname, *arg; |
28ed5b35 | 152 | int mandatory = 0; |
5931b33e FC |
153 | if (recvline(data, &buf)) |
154 | exit(128); | |
6eb996b5 DB |
155 | |
156 | if (!*buf.buf) | |
157 | break; | |
28ed5b35 IL |
158 | |
159 | if (*buf.buf == '*') { | |
160 | capname = buf.buf + 1; | |
161 | mandatory = 1; | |
162 | } else | |
163 | capname = buf.buf; | |
164 | ||
bf3c523c | 165 | if (debug) |
28ed5b35 IL |
166 | fprintf(stderr, "Debug: Got cap %s\n", capname); |
167 | if (!strcmp(capname, "fetch")) | |
6eb996b5 | 168 | data->fetch = 1; |
28ed5b35 | 169 | else if (!strcmp(capname, "option")) |
ef08ef9e | 170 | data->option = 1; |
28ed5b35 | 171 | else if (!strcmp(capname, "push")) |
ae4efe19 | 172 | data->push = 1; |
28ed5b35 | 173 | else if (!strcmp(capname, "import")) |
e65e91ed | 174 | data->import = 1; |
bfc366d9 FA |
175 | else if (!strcmp(capname, "bidi-import")) |
176 | data->bidi_import = 1; | |
73b49a75 SR |
177 | else if (!strcmp(capname, "export")) |
178 | data->export = 1; | |
9ba38048 NTND |
179 | else if (!strcmp(capname, "check-connectivity")) |
180 | data->check_connectivity = 1; | |
21a2d4ad | 181 | else if (!data->refspecs && skip_prefix(capname, "refspec ", &arg)) { |
72ff8943 DB |
182 | ALLOC_GROW(refspecs, |
183 | refspec_nr + 1, | |
184 | refspec_alloc); | |
21a2d4ad | 185 | refspecs[refspec_nr++] = xstrdup(arg); |
fa8c097c IL |
186 | } else if (!strcmp(capname, "connect")) { |
187 | data->connect = 1; | |
0d957a4d JK |
188 | } else if (!strcmp(capname, "signed-tags")) { |
189 | data->signed_tags = 1; | |
21a2d4ad JK |
190 | } else if (skip_prefix(capname, "export-marks ", &arg)) { |
191 | data->export_marks = xstrdup(arg); | |
192 | } else if (skip_prefix(capname, "import-marks ", &arg)) { | |
193 | data->import_marks = xstrdup(arg); | |
59556548 | 194 | } else if (starts_with(capname, "no-private-update")) { |
597b831a | 195 | data->no_private_update = 1; |
28ed5b35 | 196 | } else if (mandatory) { |
9517e6b8 | 197 | die("Unknown mandatory capability %s. This remote " |
82247e9b | 198 | "helper probably needs newer version of Git.", |
28ed5b35 | 199 | capname); |
72ff8943 DB |
200 | } |
201 | } | |
202 | if (refspecs) { | |
203 | int i; | |
204 | data->refspec_nr = refspec_nr; | |
205 | data->refspecs = parse_fetch_refspec(refspec_nr, refspecs); | |
b120ef3e | 206 | for (i = 0; i < refspec_nr; i++) |
72ff8943 | 207 | free((char *)refspecs[i]); |
72ff8943 | 208 | free(refspecs); |
a93b4a09 FC |
209 | } else if (data->import || data->bidi_import || data->export) { |
210 | warning("This remote helper should implement refspec capability."); | |
6eb996b5 | 211 | } |
b962dbdc | 212 | strbuf_release(&buf); |
bf3c523c IL |
213 | if (debug) |
214 | fprintf(stderr, "Debug: Capabilities complete.\n"); | |
6eb996b5 DB |
215 | return data->helper; |
216 | } | |
217 | ||
218 | static int disconnect_helper(struct transport *transport) | |
219 | { | |
220 | struct helper_data *data = transport->data; | |
cc567322 | 221 | int res = 0; |
bf3c523c | 222 | |
6eb996b5 | 223 | if (data->helper) { |
bf3c523c IL |
224 | if (debug) |
225 | fprintf(stderr, "Debug: Disconnecting.\n"); | |
fa8c097c | 226 | if (!data->no_disconnect_req) { |
c34fe630 JK |
227 | /* |
228 | * Ignore write errors; there's nothing we can do, | |
229 | * since we're about to close the pipe anyway. And the | |
230 | * most likely error is EPIPE due to the helper dying | |
231 | * to report an error itself. | |
232 | */ | |
233 | sigchain_push(SIGPIPE, SIG_IGN); | |
234 | xwrite(data->helper->in, "\n", 1); | |
235 | sigchain_pop(SIGPIPE); | |
fa8c097c | 236 | } |
6eb996b5 | 237 | close(data->helper->in); |
61b075bd | 238 | close(data->helper->out); |
292ce46b | 239 | fclose(data->out); |
cc567322 | 240 | res = finish_command(data->helper); |
6eb996b5 DB |
241 | free(data->helper); |
242 | data->helper = NULL; | |
243 | } | |
cc567322 | 244 | return res; |
6eb996b5 DB |
245 | } |
246 | ||
ef08ef9e SP |
247 | static const char *unsupported_options[] = { |
248 | TRANS_OPT_UPLOADPACK, | |
249 | TRANS_OPT_RECEIVEPACK, | |
250 | TRANS_OPT_THIN, | |
251 | TRANS_OPT_KEEP | |
252 | }; | |
23cd01ec | 253 | |
ef08ef9e SP |
254 | static const char *boolean_options[] = { |
255 | TRANS_OPT_THIN, | |
256 | TRANS_OPT_KEEP, | |
0ea47f9d JH |
257 | TRANS_OPT_FOLLOWTAGS, |
258 | TRANS_OPT_PUSH_CERT | |
ef08ef9e SP |
259 | }; |
260 | ||
261 | static int set_helper_option(struct transport *transport, | |
262 | const char *name, const char *value) | |
263 | { | |
264 | struct helper_data *data = transport->data; | |
ef08ef9e SP |
265 | struct strbuf buf = STRBUF_INIT; |
266 | int i, ret, is_bool = 0; | |
267 | ||
bf3c523c IL |
268 | get_helper(transport); |
269 | ||
ef08ef9e SP |
270 | if (!data->option) |
271 | return 1; | |
272 | ||
273 | for (i = 0; i < ARRAY_SIZE(unsupported_options); i++) { | |
274 | if (!strcmp(name, unsupported_options[i])) | |
275 | return 1; | |
276 | } | |
277 | ||
278 | for (i = 0; i < ARRAY_SIZE(boolean_options); i++) { | |
279 | if (!strcmp(name, boolean_options[i])) { | |
280 | is_bool = 1; | |
281 | break; | |
282 | } | |
283 | } | |
284 | ||
285 | strbuf_addf(&buf, "option %s ", name); | |
286 | if (is_bool) | |
287 | strbuf_addstr(&buf, value ? "true" : "false"); | |
288 | else | |
289 | quote_c_style(value, &buf, NULL, 0); | |
290 | strbuf_addch(&buf, '\n'); | |
291 | ||
4a1b59c8 | 292 | sendline(data, &buf); |
5931b33e FC |
293 | if (recvline(data, &buf)) |
294 | exit(128); | |
ef08ef9e SP |
295 | |
296 | if (!strcmp(buf.buf, "ok")) | |
297 | ret = 0; | |
59556548 | 298 | else if (starts_with(buf.buf, "error")) { |
ef08ef9e SP |
299 | ret = -1; |
300 | } else if (!strcmp(buf.buf, "unsupported")) | |
301 | ret = 1; | |
302 | else { | |
303 | warning("%s unexpectedly said: '%s'", data->name, buf.buf); | |
304 | ret = 1; | |
305 | } | |
306 | strbuf_release(&buf); | |
307 | return ret; | |
308 | } | |
309 | ||
310 | static void standard_options(struct transport *t) | |
311 | { | |
312 | char buf[16]; | |
313 | int n; | |
314 | int v = t->verbose; | |
ef08ef9e | 315 | |
d01b3c02 | 316 | set_helper_option(t, "progress", t->progress ? "true" : "false"); |
ef08ef9e SP |
317 | |
318 | n = snprintf(buf, sizeof(buf), "%d", v + 1); | |
319 | if (n >= sizeof(buf)) | |
320 | die("impossibly large verbosity value"); | |
321 | set_helper_option(t, "verbosity", buf); | |
322 | } | |
323 | ||
f2a37151 DB |
324 | static int release_helper(struct transport *transport) |
325 | { | |
cc567322 | 326 | int res = 0; |
72ff8943 DB |
327 | struct helper_data *data = transport->data; |
328 | free_refspec(data->refspec_nr, data->refspecs); | |
329 | data->refspecs = NULL; | |
cc567322 | 330 | res = disconnect_helper(transport); |
f2a37151 | 331 | free(transport->data); |
cc567322 | 332 | return res; |
f2a37151 DB |
333 | } |
334 | ||
6eb996b5 | 335 | static int fetch_with_fetch(struct transport *transport, |
37148311 | 336 | int nr_heads, struct ref **to_fetch) |
6eb996b5 | 337 | { |
292ce46b | 338 | struct helper_data *data = transport->data; |
6eb996b5 DB |
339 | int i; |
340 | struct strbuf buf = STRBUF_INIT; | |
341 | ||
ef08ef9e | 342 | standard_options(transport); |
9ba38048 NTND |
343 | if (data->check_connectivity && |
344 | data->transport_options.check_self_contained_and_connected) | |
345 | set_helper_option(transport, "check-connectivity", "true"); | |
ef08ef9e | 346 | |
16094885 NTND |
347 | if (transport->cloning) |
348 | set_helper_option(transport, "cloning", "true"); | |
349 | ||
350 | if (data->transport_options.update_shallow) | |
351 | set_helper_option(transport, "update-shallow", "true"); | |
352 | ||
6eb996b5 | 353 | for (i = 0; i < nr_heads; i++) { |
1088261f | 354 | const struct ref *posn = to_fetch[i]; |
6eb996b5 DB |
355 | if (posn->status & REF_STATUS_UPTODATE) |
356 | continue; | |
2d14d65c DB |
357 | |
358 | strbuf_addf(&buf, "fetch %s %s\n", | |
359 | sha1_to_hex(posn->old_sha1), posn->name); | |
292ce46b | 360 | } |
2d14d65c | 361 | |
292ce46b | 362 | strbuf_addch(&buf, '\n'); |
bf3c523c | 363 | sendline(data, &buf); |
292ce46b SP |
364 | |
365 | while (1) { | |
5931b33e FC |
366 | if (recvline(data, &buf)) |
367 | exit(128); | |
292ce46b | 368 | |
59556548 | 369 | if (starts_with(buf.buf, "lock ")) { |
292ce46b SP |
370 | const char *name = buf.buf + 5; |
371 | if (transport->pack_lockfile) | |
372 | warning("%s also locked %s", data->name, name); | |
373 | else | |
374 | transport->pack_lockfile = xstrdup(name); | |
375 | } | |
9ba38048 NTND |
376 | else if (data->check_connectivity && |
377 | data->transport_options.check_self_contained_and_connected && | |
378 | !strcmp(buf.buf, "connectivity-ok")) | |
379 | data->transport_options.self_contained_and_connected = 1; | |
292ce46b SP |
380 | else if (!buf.len) |
381 | break; | |
382 | else | |
383 | warning("%s unexpectedly said: '%s'", data->name, buf.buf); | |
6eb996b5 | 384 | } |
292ce46b | 385 | strbuf_release(&buf); |
6eb996b5 DB |
386 | return 0; |
387 | } | |
388 | ||
e65e91ed DB |
389 | static int get_importer(struct transport *transport, struct child_process *fastimport) |
390 | { | |
391 | struct child_process *helper = get_helper(transport); | |
bfc366d9 | 392 | struct helper_data *data = transport->data; |
bfc366d9 | 393 | int cat_blob_fd, code; |
483bbd4e | 394 | child_process_init(fastimport); |
e65e91ed | 395 | fastimport->in = helper->out; |
173fd1a1 JK |
396 | argv_array_push(&fastimport->args, "fast-import"); |
397 | argv_array_push(&fastimport->args, debug ? "--stats" : "--quiet"); | |
e65e91ed | 398 | |
bfc366d9 FA |
399 | if (data->bidi_import) { |
400 | cat_blob_fd = xdup(helper->in); | |
173fd1a1 | 401 | argv_array_pushf(&fastimport->args, "--cat-blob-fd=%d", cat_blob_fd); |
bfc366d9 | 402 | } |
e65e91ed | 403 | fastimport->git_cmd = 1; |
bfc366d9 FA |
404 | |
405 | code = start_command(fastimport); | |
406 | return code; | |
e65e91ed DB |
407 | } |
408 | ||
73b49a75 SR |
409 | static int get_exporter(struct transport *transport, |
410 | struct child_process *fastexport, | |
73b49a75 SR |
411 | struct string_list *revlist_args) |
412 | { | |
a515ebe9 | 413 | struct helper_data *data = transport->data; |
73b49a75 | 414 | struct child_process *helper = get_helper(transport); |
2aeae40a | 415 | int i; |
852e54bc | 416 | |
8828f298 | 417 | child_process_init(fastexport); |
73b49a75 SR |
418 | |
419 | /* we need to duplicate helper->in because we want to use it after | |
420 | * fastexport is done with it. */ | |
421 | fastexport->out = dup(helper->in); | |
2aeae40a JK |
422 | argv_array_push(&fastexport->args, "fast-export"); |
423 | argv_array_push(&fastexport->args, "--use-done-feature"); | |
424 | argv_array_push(&fastexport->args, data->signed_tags ? | |
425 | "--signed-tags=verbatim" : "--signed-tags=warn-strip"); | |
426 | if (data->export_marks) | |
427 | argv_array_pushf(&fastexport->args, "--export-marks=%s.tmp", data->export_marks); | |
428 | if (data->import_marks) | |
429 | argv_array_pushf(&fastexport->args, "--import-marks=%s", data->import_marks); | |
73b49a75 SR |
430 | |
431 | for (i = 0; i < revlist_args->nr; i++) | |
2aeae40a | 432 | argv_array_push(&fastexport->args, revlist_args->items[i].string); |
73b49a75 SR |
433 | |
434 | fastexport->git_cmd = 1; | |
435 | return start_command(fastexport); | |
436 | } | |
437 | ||
e65e91ed DB |
438 | static int fetch_with_import(struct transport *transport, |
439 | int nr_heads, struct ref **to_fetch) | |
440 | { | |
441 | struct child_process fastimport; | |
72ff8943 | 442 | struct helper_data *data = transport->data; |
e65e91ed DB |
443 | int i; |
444 | struct ref *posn; | |
445 | struct strbuf buf = STRBUF_INIT; | |
446 | ||
bf3c523c IL |
447 | get_helper(transport); |
448 | ||
e65e91ed DB |
449 | if (get_importer(transport, &fastimport)) |
450 | die("Couldn't run fast-import"); | |
451 | ||
452 | for (i = 0; i < nr_heads; i++) { | |
453 | posn = to_fetch[i]; | |
454 | if (posn->status & REF_STATUS_UPTODATE) | |
455 | continue; | |
456 | ||
457 | strbuf_addf(&buf, "import %s\n", posn->name); | |
bf3c523c | 458 | sendline(data, &buf); |
e65e91ed DB |
459 | strbuf_reset(&buf); |
460 | } | |
9504bc9d SR |
461 | |
462 | write_constant(data->helper->in, "\n"); | |
bfc366d9 FA |
463 | /* |
464 | * remote-helpers that advertise the bidi-import capability are required to | |
465 | * buffer the complete batch of import commands until this newline before | |
466 | * sending data to fast-import. | |
467 | * These helpers read back data from fast-import on their stdin, which could | |
468 | * be mixed with import commands, otherwise. | |
469 | */ | |
9504bc9d | 470 | |
cc567322 SR |
471 | if (finish_command(&fastimport)) |
472 | die("Error while running fast-import"); | |
e65e91ed | 473 | |
dff9d65d FA |
474 | /* |
475 | * The fast-import stream of a remote helper that advertises | |
476 | * the "refspec" capability writes to the refs named after the | |
477 | * right hand side of the first refspec matching each ref we | |
478 | * were fetching. | |
479 | * | |
480 | * (If no "refspec" capability was specified, for historical | |
7a43c554 | 481 | * reasons we default to the equivalent of *:*.) |
dff9d65d FA |
482 | * |
483 | * Store the result in to_fetch[i].old_sha1. Callers such | |
484 | * as "git fetch" can use the value to write feedback to the | |
485 | * terminal, populate FETCH_HEAD, and determine what new value | |
486 | * should be written to peer_ref if the update is a | |
487 | * fast-forward or this is a forced update. | |
488 | */ | |
e65e91ed | 489 | for (i = 0; i < nr_heads; i++) { |
72ff8943 | 490 | char *private; |
e65e91ed DB |
491 | posn = to_fetch[i]; |
492 | if (posn->status & REF_STATUS_UPTODATE) | |
493 | continue; | |
72ff8943 DB |
494 | if (data->refspecs) |
495 | private = apply_refspecs(data->refspecs, data->refspec_nr, posn->name); | |
496 | else | |
c28cce55 | 497 | private = xstrdup(posn->name); |
d51b720f MH |
498 | if (private) { |
499 | read_ref(private, posn->old_sha1); | |
500 | free(private); | |
501 | } | |
e65e91ed | 502 | } |
b962dbdc | 503 | strbuf_release(&buf); |
e65e91ed DB |
504 | return 0; |
505 | } | |
506 | ||
fa8c097c IL |
507 | static int process_connect_service(struct transport *transport, |
508 | const char *name, const char *exec) | |
509 | { | |
510 | struct helper_data *data = transport->data; | |
511 | struct strbuf cmdbuf = STRBUF_INIT; | |
512 | struct child_process *helper; | |
513 | int r, duped, ret = 0; | |
514 | FILE *input; | |
515 | ||
516 | helper = get_helper(transport); | |
517 | ||
518 | /* | |
519 | * Yes, dup the pipe another time, as we need unbuffered version | |
520 | * of input pipe as FILE*. fclose() closes the underlying fd and | |
521 | * stream buffering only can be changed before first I/O operation | |
522 | * on it. | |
523 | */ | |
524 | duped = dup(helper->out); | |
525 | if (duped < 0) | |
526 | die_errno("Can't dup helper output fd"); | |
527 | input = xfdopen(duped, "r"); | |
528 | setvbuf(input, NULL, _IONBF, 0); | |
529 | ||
530 | /* | |
531 | * Handle --upload-pack and friends. This is fire and forget... | |
532 | * just warn if it fails. | |
533 | */ | |
534 | if (strcmp(name, exec)) { | |
535 | r = set_helper_option(transport, "servpath", exec); | |
536 | if (r > 0) | |
537 | warning("Setting remote service path not supported by protocol."); | |
538 | else if (r < 0) | |
539 | warning("Invalid remote service path."); | |
540 | } | |
541 | ||
542 | if (data->connect) | |
543 | strbuf_addf(&cmdbuf, "connect %s\n", name); | |
544 | else | |
545 | goto exit; | |
546 | ||
547 | sendline(data, &cmdbuf); | |
5931b33e FC |
548 | if (recvline_fh(input, &cmdbuf, name)) |
549 | exit(128); | |
550 | ||
fa8c097c IL |
551 | if (!strcmp(cmdbuf.buf, "")) { |
552 | data->no_disconnect_req = 1; | |
553 | if (debug) | |
554 | fprintf(stderr, "Debug: Smart transport connection " | |
555 | "ready.\n"); | |
556 | ret = 1; | |
557 | } else if (!strcmp(cmdbuf.buf, "fallback")) { | |
558 | if (debug) | |
559 | fprintf(stderr, "Debug: Falling back to dumb " | |
560 | "transport.\n"); | |
561 | } else | |
562 | die("Unknown response to connect: %s", | |
563 | cmdbuf.buf); | |
564 | ||
565 | exit: | |
566 | fclose(input); | |
567 | return ret; | |
568 | } | |
569 | ||
570 | static int process_connect(struct transport *transport, | |
571 | int for_push) | |
572 | { | |
573 | struct helper_data *data = transport->data; | |
574 | const char *name; | |
575 | const char *exec; | |
576 | ||
577 | name = for_push ? "git-receive-pack" : "git-upload-pack"; | |
578 | if (for_push) | |
579 | exec = data->transport_options.receivepack; | |
580 | else | |
581 | exec = data->transport_options.uploadpack; | |
582 | ||
583 | return process_connect_service(transport, name, exec); | |
584 | } | |
585 | ||
b236752a IL |
586 | static int connect_helper(struct transport *transport, const char *name, |
587 | const char *exec, int fd[2]) | |
588 | { | |
589 | struct helper_data *data = transport->data; | |
590 | ||
591 | /* Get_helper so connect is inited. */ | |
592 | get_helper(transport); | |
593 | if (!data->connect) | |
594 | die("Operation not supported by protocol."); | |
595 | ||
596 | if (!process_connect_service(transport, name, exec)) | |
597 | die("Can't connect to subservice %s.", name); | |
598 | ||
599 | fd[0] = data->helper->out; | |
600 | fd[1] = data->helper->in; | |
601 | return 0; | |
602 | } | |
603 | ||
6eb996b5 | 604 | static int fetch(struct transport *transport, |
37148311 | 605 | int nr_heads, struct ref **to_fetch) |
6eb996b5 DB |
606 | { |
607 | struct helper_data *data = transport->data; | |
608 | int i, count; | |
609 | ||
fa8c097c IL |
610 | if (process_connect(transport, 0)) { |
611 | do_take_over(transport); | |
612 | return transport->fetch(transport, nr_heads, to_fetch); | |
613 | } | |
614 | ||
6eb996b5 DB |
615 | count = 0; |
616 | for (i = 0; i < nr_heads; i++) | |
617 | if (!(to_fetch[i]->status & REF_STATUS_UPTODATE)) | |
618 | count++; | |
619 | ||
620 | if (!count) | |
621 | return 0; | |
622 | ||
623 | if (data->fetch) | |
624 | return fetch_with_fetch(transport, nr_heads, to_fetch); | |
625 | ||
e65e91ed DB |
626 | if (data->import) |
627 | return fetch_with_import(transport, nr_heads, to_fetch); | |
628 | ||
6eb996b5 DB |
629 | return -1; |
630 | } | |
631 | ||
664059fb | 632 | static int push_update_ref_status(struct strbuf *buf, |
d2e73c6f SR |
633 | struct ref **ref, |
634 | struct ref *remote_refs) | |
635 | { | |
636 | char *refname, *msg; | |
f9e3c6be | 637 | int status, forced = 0; |
d2e73c6f | 638 | |
59556548 | 639 | if (starts_with(buf->buf, "ok ")) { |
d2e73c6f SR |
640 | status = REF_STATUS_OK; |
641 | refname = buf->buf + 3; | |
59556548 | 642 | } else if (starts_with(buf->buf, "error ")) { |
d2e73c6f SR |
643 | status = REF_STATUS_REMOTE_REJECT; |
644 | refname = buf->buf + 6; | |
645 | } else | |
82247e9b | 646 | die("expected ok/error, helper said '%s'", buf->buf); |
d2e73c6f SR |
647 | |
648 | msg = strchr(refname, ' '); | |
649 | if (msg) { | |
650 | struct strbuf msg_buf = STRBUF_INIT; | |
651 | const char *end; | |
652 | ||
653 | *msg++ = '\0'; | |
654 | if (!unquote_c_style(&msg_buf, msg, &end)) | |
655 | msg = strbuf_detach(&msg_buf, NULL); | |
656 | else | |
657 | msg = xstrdup(msg); | |
658 | strbuf_release(&msg_buf); | |
659 | ||
660 | if (!strcmp(msg, "no match")) { | |
661 | status = REF_STATUS_NONE; | |
662 | free(msg); | |
663 | msg = NULL; | |
664 | } | |
665 | else if (!strcmp(msg, "up to date")) { | |
666 | status = REF_STATUS_UPTODATE; | |
667 | free(msg); | |
668 | msg = NULL; | |
669 | } | |
670 | else if (!strcmp(msg, "non-fast forward")) { | |
671 | status = REF_STATUS_REJECT_NONFASTFORWARD; | |
672 | free(msg); | |
673 | msg = NULL; | |
674 | } | |
dbfeddb1 CR |
675 | else if (!strcmp(msg, "already exists")) { |
676 | status = REF_STATUS_REJECT_ALREADY_EXISTS; | |
677 | free(msg); | |
678 | msg = NULL; | |
679 | } | |
75e5c0dc JH |
680 | else if (!strcmp(msg, "fetch first")) { |
681 | status = REF_STATUS_REJECT_FETCH_FIRST; | |
682 | free(msg); | |
683 | msg = NULL; | |
684 | } | |
685 | else if (!strcmp(msg, "needs force")) { | |
686 | status = REF_STATUS_REJECT_NEEDS_FORCE; | |
687 | free(msg); | |
688 | msg = NULL; | |
689 | } | |
631b5ef2 JH |
690 | else if (!strcmp(msg, "stale info")) { |
691 | status = REF_STATUS_REJECT_STALE; | |
692 | free(msg); | |
693 | msg = NULL; | |
694 | } | |
f9e3c6be FC |
695 | else if (!strcmp(msg, "forced update")) { |
696 | forced = 1; | |
697 | free(msg); | |
698 | msg = NULL; | |
699 | } | |
d2e73c6f SR |
700 | } |
701 | ||
702 | if (*ref) | |
703 | *ref = find_ref_by_name(*ref, refname); | |
704 | if (!*ref) | |
705 | *ref = find_ref_by_name(remote_refs, refname); | |
706 | if (!*ref) { | |
707 | warning("helper reported unexpected status of %s", refname); | |
664059fb | 708 | return 1; |
d2e73c6f SR |
709 | } |
710 | ||
711 | if ((*ref)->status != REF_STATUS_NONE) { | |
712 | /* | |
713 | * Earlier, the ref was marked not to be pushed, so ignore the ref | |
714 | * status reported by the remote helper if the latter is 'no match'. | |
715 | */ | |
716 | if (status == REF_STATUS_NONE) | |
664059fb | 717 | return 1; |
d2e73c6f SR |
718 | } |
719 | ||
720 | (*ref)->status = status; | |
cf31f70c | 721 | (*ref)->forced_update |= forced; |
d2e73c6f | 722 | (*ref)->remote_status = msg; |
126aac5c | 723 | return !(status == REF_STATUS_OK); |
d2e73c6f SR |
724 | } |
725 | ||
0551a06c | 726 | static int push_update_refs_status(struct helper_data *data, |
5a75353f FC |
727 | struct ref *remote_refs, |
728 | int flags) | |
d2e73c6f SR |
729 | { |
730 | struct strbuf buf = STRBUF_INIT; | |
731 | struct ref *ref = remote_refs; | |
0551a06c FC |
732 | int ret = 0; |
733 | ||
d2e73c6f | 734 | for (;;) { |
664059fb FC |
735 | char *private; |
736 | ||
0551a06c FC |
737 | if (recvline(data, &buf)) { |
738 | ret = 1; | |
739 | break; | |
740 | } | |
741 | ||
d2e73c6f SR |
742 | if (!buf.len) |
743 | break; | |
744 | ||
664059fb FC |
745 | if (push_update_ref_status(&buf, &ref, remote_refs)) |
746 | continue; | |
747 | ||
5a75353f | 748 | if (flags & TRANSPORT_PUSH_DRY_RUN || !data->refspecs || data->no_private_update) |
664059fb FC |
749 | continue; |
750 | ||
751 | /* propagate back the update to the remote namespace */ | |
752 | private = apply_refspecs(data->refspecs, data->refspec_nr, ref->name); | |
753 | if (!private) | |
754 | continue; | |
755 | update_ref("update by helper", private, ref->new_sha1, NULL, 0, 0); | |
756 | free(private); | |
d2e73c6f SR |
757 | } |
758 | strbuf_release(&buf); | |
0551a06c | 759 | return ret; |
d2e73c6f SR |
760 | } |
761 | ||
73b49a75 | 762 | static int push_refs_with_push(struct transport *transport, |
05c1eb10 | 763 | struct ref *remote_refs, int flags) |
ae4efe19 SP |
764 | { |
765 | int force_all = flags & TRANSPORT_PUSH_FORCE; | |
766 | int mirror = flags & TRANSPORT_PUSH_MIRROR; | |
767 | struct helper_data *data = transport->data; | |
768 | struct strbuf buf = STRBUF_INIT; | |
ae4efe19 | 769 | struct ref *ref; |
05c1eb10 JH |
770 | struct string_list cas_options = STRING_LIST_INIT_DUP; |
771 | struct string_list_item *cas_option; | |
ae4efe19 | 772 | |
c0aa335c | 773 | get_helper(transport); |
ae4efe19 SP |
774 | if (!data->push) |
775 | return 1; | |
776 | ||
777 | for (ref = remote_refs; ref; ref = ref->next) { | |
20e8b465 | 778 | if (!ref->peer_ref && !mirror) |
ae4efe19 SP |
779 | continue; |
780 | ||
20e8b465 TRC |
781 | /* Check for statuses set by set_ref_status_for_push() */ |
782 | switch (ref->status) { | |
783 | case REF_STATUS_REJECT_NONFASTFORWARD: | |
631b5ef2 | 784 | case REF_STATUS_REJECT_STALE: |
dbfeddb1 | 785 | case REF_STATUS_REJECT_ALREADY_EXISTS: |
20e8b465 | 786 | case REF_STATUS_UPTODATE: |
ae4efe19 | 787 | continue; |
20e8b465 TRC |
788 | default: |
789 | ; /* do nothing */ | |
ae4efe19 SP |
790 | } |
791 | ||
792 | if (force_all) | |
793 | ref->force = 1; | |
794 | ||
795 | strbuf_addstr(&buf, "push "); | |
796 | if (!ref->deletion) { | |
797 | if (ref->force) | |
798 | strbuf_addch(&buf, '+'); | |
799 | if (ref->peer_ref) | |
800 | strbuf_addstr(&buf, ref->peer_ref->name); | |
801 | else | |
802 | strbuf_addstr(&buf, sha1_to_hex(ref->new_sha1)); | |
803 | } | |
804 | strbuf_addch(&buf, ':'); | |
805 | strbuf_addstr(&buf, ref->name); | |
806 | strbuf_addch(&buf, '\n'); | |
05c1eb10 JH |
807 | |
808 | /* | |
809 | * The "--force-with-lease" options without explicit | |
810 | * values to expect have already been expanded into | |
811 | * the ref->old_sha1_expect[] field; we can ignore | |
812 | * transport->smart_options->cas altogether and instead | |
813 | * can enumerate them from the refs. | |
814 | */ | |
815 | if (ref->expect_old_sha1) { | |
816 | struct strbuf cas = STRBUF_INIT; | |
817 | strbuf_addf(&cas, "%s:%s", | |
818 | ref->name, sha1_to_hex(ref->old_sha1_expect)); | |
819 | string_list_append(&cas_options, strbuf_detach(&cas, NULL)); | |
820 | } | |
ae4efe19 | 821 | } |
05c1eb10 JH |
822 | if (buf.len == 0) { |
823 | string_list_clear(&cas_options, 0); | |
d8f67d20 | 824 | return 0; |
05c1eb10 | 825 | } |
ae4efe19 | 826 | |
ae4efe19 | 827 | standard_options(transport); |
05c1eb10 JH |
828 | for_each_string_list_item(cas_option, &cas_options) |
829 | set_helper_option(transport, "cas", cas_option->string); | |
ae4efe19 SP |
830 | |
831 | if (flags & TRANSPORT_PUSH_DRY_RUN) { | |
832 | if (set_helper_option(transport, "dry-run", "true") != 0) | |
833 | die("helper %s does not support dry-run", data->name); | |
0ea47f9d JH |
834 | } else if (flags & TRANSPORT_PUSH_CERT) { |
835 | if (set_helper_option(transport, TRANS_OPT_PUSH_CERT, "true") != 0) | |
836 | die("helper %s does not support --signed", data->name); | |
ae4efe19 SP |
837 | } |
838 | ||
839 | strbuf_addch(&buf, '\n'); | |
bf3c523c | 840 | sendline(data, &buf); |
ae4efe19 | 841 | strbuf_release(&buf); |
d2e73c6f | 842 | |
0551a06c | 843 | return push_update_refs_status(data, remote_refs, flags); |
ae4efe19 SP |
844 | } |
845 | ||
73b49a75 SR |
846 | static int push_refs_with_export(struct transport *transport, |
847 | struct ref *remote_refs, int flags) | |
848 | { | |
849 | struct ref *ref; | |
850 | struct child_process *helper, exporter; | |
851 | struct helper_data *data = transport->data; | |
d98c8153 | 852 | struct string_list revlist_args = STRING_LIST_INIT_DUP; |
73b49a75 SR |
853 | struct strbuf buf = STRBUF_INIT; |
854 | ||
21610d82 FC |
855 | if (!data->refspecs) |
856 | die("remote-helper doesn't support push; refspec needed"); | |
857 | ||
21457f57 FC |
858 | if (flags & TRANSPORT_PUSH_DRY_RUN) { |
859 | if (set_helper_option(transport, "dry-run", "true") != 0) | |
860 | die("helper %s does not support dry-run", data->name); | |
0ea47f9d JH |
861 | } else if (flags & TRANSPORT_PUSH_CERT) { |
862 | if (set_helper_option(transport, TRANS_OPT_PUSH_CERT, "true") != 0) | |
863 | die("helper %s does not support dry-run", data->name); | |
21457f57 FC |
864 | } |
865 | ||
510fa6f5 FC |
866 | if (flags & TRANSPORT_PUSH_FORCE) { |
867 | if (set_helper_option(transport, "force", "true") != 0) | |
868 | warning("helper %s does not support 'force'", data->name); | |
869 | } | |
870 | ||
73b49a75 SR |
871 | helper = get_helper(transport); |
872 | ||
873 | write_constant(helper->in, "export\n"); | |
874 | ||
73b49a75 SR |
875 | for (ref = remote_refs; ref; ref = ref->next) { |
876 | char *private; | |
877 | unsigned char sha1[20]; | |
878 | ||
73b49a75 SR |
879 | private = apply_refspecs(data->refspecs, data->refspec_nr, ref->name); |
880 | if (private && !get_sha1(private, sha1)) { | |
881 | strbuf_addf(&buf, "^%s", private); | |
1d2f80fa | 882 | string_list_append(&revlist_args, strbuf_detach(&buf, NULL)); |
b056620f | 883 | hashcpy(ref->old_sha1, sha1); |
73b49a75 | 884 | } |
2faa1527 | 885 | free(private); |
73b49a75 | 886 | |
67c9c782 | 887 | if (ref->peer_ref) { |
d98c8153 | 888 | if (strcmp(ref->name, ref->peer_ref->name)) { |
f3d03763 FC |
889 | if (!ref->deletion) { |
890 | const char *name; | |
891 | int flag; | |
892 | ||
893 | /* Follow symbolic refs (mainly for HEAD). */ | |
7695d118 RS |
894 | name = resolve_ref_unsafe( |
895 | ref->peer_ref->name, | |
896 | RESOLVE_REF_READING, | |
897 | sha1, &flag); | |
f3d03763 FC |
898 | if (!name || !(flag & REF_ISSYMREF)) |
899 | name = ref->peer_ref->name; | |
9193f742 | 900 | |
f3d03763 FC |
901 | strbuf_addf(&buf, "%s:%s", name, ref->name); |
902 | } else | |
903 | strbuf_addf(&buf, ":%s", ref->name); | |
9193f742 | 904 | |
d98c8153 FC |
905 | string_list_append(&revlist_args, "--refspec"); |
906 | string_list_append(&revlist_args, buf.buf); | |
907 | strbuf_release(&buf); | |
908 | } | |
f3d03763 FC |
909 | if (!ref->deletion) |
910 | string_list_append(&revlist_args, ref->peer_ref->name); | |
67c9c782 | 911 | } |
73b49a75 SR |
912 | } |
913 | ||
a515ebe9 | 914 | if (get_exporter(transport, &exporter, &revlist_args)) |
73b49a75 SR |
915 | die("Couldn't run fast-export"); |
916 | ||
d98c8153 FC |
917 | string_list_clear(&revlist_args, 1); |
918 | ||
cc567322 SR |
919 | if (finish_command(&exporter)) |
920 | die("Error while running fast-export"); | |
3994e64d FC |
921 | if (push_update_refs_status(data, remote_refs, flags)) |
922 | return 1; | |
923 | ||
924 | if (data->export_marks) { | |
925 | strbuf_addf(&buf, "%s.tmp", data->export_marks); | |
926 | rename(buf.buf, data->export_marks); | |
927 | strbuf_release(&buf); | |
928 | } | |
929 | ||
930 | return 0; | |
73b49a75 SR |
931 | } |
932 | ||
933 | static int push_refs(struct transport *transport, | |
934 | struct ref *remote_refs, int flags) | |
935 | { | |
936 | struct helper_data *data = transport->data; | |
937 | ||
938 | if (process_connect(transport, 1)) { | |
939 | do_take_over(transport); | |
940 | return transport->push_refs(transport, remote_refs, flags); | |
941 | } | |
942 | ||
943 | if (!remote_refs) { | |
944 | fprintf(stderr, "No refs in common and none specified; doing nothing.\n" | |
945 | "Perhaps you should specify a branch such as 'master'.\n"); | |
946 | return 0; | |
947 | } | |
948 | ||
949 | if (data->push) | |
950 | return push_refs_with_push(transport, remote_refs, flags); | |
951 | ||
952 | if (data->export) | |
953 | return push_refs_with_export(transport, remote_refs, flags); | |
954 | ||
955 | return -1; | |
956 | } | |
957 | ||
958 | ||
f8ec9167 DB |
959 | static int has_attribute(const char *attrs, const char *attr) { |
960 | int len; | |
961 | if (!attrs) | |
962 | return 0; | |
963 | ||
964 | len = strlen(attr); | |
965 | for (;;) { | |
966 | const char *space = strchrnul(attrs, ' '); | |
967 | if (len == space - attrs && !strncmp(attrs, attr, len)) | |
968 | return 1; | |
969 | if (!*space) | |
970 | return 0; | |
971 | attrs = space + 1; | |
972 | } | |
973 | } | |
974 | ||
6eb996b5 DB |
975 | static struct ref *get_refs_list(struct transport *transport, int for_push) |
976 | { | |
292ce46b | 977 | struct helper_data *data = transport->data; |
6eb996b5 DB |
978 | struct child_process *helper; |
979 | struct ref *ret = NULL; | |
980 | struct ref **tail = &ret; | |
981 | struct ref *posn; | |
982 | struct strbuf buf = STRBUF_INIT; | |
6eb996b5 DB |
983 | |
984 | helper = get_helper(transport); | |
2d14d65c | 985 | |
fa8c097c IL |
986 | if (process_connect(transport, for_push)) { |
987 | do_take_over(transport); | |
988 | return transport->get_refs_list(transport, for_push); | |
989 | } | |
990 | ||
ae4efe19 SP |
991 | if (data->push && for_push) |
992 | write_str_in_full(helper->in, "list for-push\n"); | |
993 | else | |
994 | write_str_in_full(helper->in, "list\n"); | |
6eb996b5 | 995 | |
6eb996b5 DB |
996 | while (1) { |
997 | char *eov, *eon; | |
5931b33e FC |
998 | if (recvline(data, &buf)) |
999 | exit(128); | |
6eb996b5 DB |
1000 | |
1001 | if (!*buf.buf) | |
1002 | break; | |
1003 | ||
1004 | eov = strchr(buf.buf, ' '); | |
1005 | if (!eov) | |
1006 | die("Malformed response in ref list: %s", buf.buf); | |
1007 | eon = strchr(eov + 1, ' '); | |
1008 | *eov = '\0'; | |
1009 | if (eon) | |
1010 | *eon = '\0'; | |
1011 | *tail = alloc_ref(eov + 1); | |
1012 | if (buf.buf[0] == '@') | |
1013 | (*tail)->symref = xstrdup(buf.buf + 1); | |
1014 | else if (buf.buf[0] != '?') | |
1015 | get_sha1_hex(buf.buf, (*tail)->old_sha1); | |
f8ec9167 DB |
1016 | if (eon) { |
1017 | if (has_attribute(eon + 1, "unchanged")) { | |
1018 | (*tail)->status |= REF_STATUS_UPTODATE; | |
1019 | read_ref((*tail)->name, (*tail)->old_sha1); | |
1020 | } | |
1021 | } | |
6eb996b5 DB |
1022 | tail = &((*tail)->next); |
1023 | } | |
bf3c523c IL |
1024 | if (debug) |
1025 | fprintf(stderr, "Debug: Read ref listing.\n"); | |
6eb996b5 DB |
1026 | strbuf_release(&buf); |
1027 | ||
1028 | for (posn = ret; posn; posn = posn->next) | |
1029 | resolve_remote_symref(posn, ret); | |
1030 | ||
1031 | return ret; | |
1032 | } | |
1033 | ||
c9e388bb | 1034 | int transport_helper_init(struct transport *transport, const char *name) |
6eb996b5 | 1035 | { |
92e25b6b | 1036 | struct helper_data *data = xcalloc(1, sizeof(*data)); |
c9e388bb | 1037 | data->name = name; |
6eb996b5 | 1038 | |
bf3c523c IL |
1039 | if (getenv("GIT_TRANSPORT_HELPER_DEBUG")) |
1040 | debug = 1; | |
1041 | ||
6eb996b5 | 1042 | transport->data = data; |
ef08ef9e | 1043 | transport->set_option = set_helper_option; |
6eb996b5 DB |
1044 | transport->get_refs_list = get_refs_list; |
1045 | transport->fetch = fetch; | |
ae4efe19 | 1046 | transport->push_refs = push_refs; |
f2a37151 | 1047 | transport->disconnect = release_helper; |
b236752a | 1048 | transport->connect = connect_helper; |
61b075bd | 1049 | transport->smart_options = &(data->transport_options); |
6eb996b5 DB |
1050 | return 0; |
1051 | } | |
419f37db IL |
1052 | |
1053 | /* | |
1054 | * Linux pipes can buffer 65536 bytes at once (and most platforms can | |
1055 | * buffer less), so attempt reads and writes with up to that size. | |
1056 | */ | |
1057 | #define BUFFERSIZE 65536 | |
1058 | /* This should be enough to hold debugging message. */ | |
1059 | #define PBUFFERSIZE 8192 | |
1060 | ||
1061 | /* Print bidirectional transfer loop debug message. */ | |
4621085b | 1062 | __attribute__((format (printf, 1, 2))) |
419f37db IL |
1063 | static void transfer_debug(const char *fmt, ...) |
1064 | { | |
1065 | va_list args; | |
1066 | char msgbuf[PBUFFERSIZE]; | |
1067 | static int debug_enabled = -1; | |
1068 | ||
1069 | if (debug_enabled < 0) | |
1070 | debug_enabled = getenv("GIT_TRANSLOOP_DEBUG") ? 1 : 0; | |
1071 | if (!debug_enabled) | |
1072 | return; | |
1073 | ||
1074 | va_start(args, fmt); | |
1075 | vsnprintf(msgbuf, PBUFFERSIZE, fmt, args); | |
1076 | va_end(args); | |
1077 | fprintf(stderr, "Transfer loop debugging: %s\n", msgbuf); | |
1078 | } | |
1079 | ||
1080 | /* Stream state: More data may be coming in this direction. */ | |
1081 | #define SSTATE_TRANSFERING 0 | |
1082 | /* | |
1083 | * Stream state: No more data coming in this direction, flushing rest of | |
1084 | * data. | |
1085 | */ | |
1086 | #define SSTATE_FLUSHING 1 | |
1087 | /* Stream state: Transfer in this direction finished. */ | |
1088 | #define SSTATE_FINISHED 2 | |
1089 | ||
1090 | #define STATE_NEEDS_READING(state) ((state) <= SSTATE_TRANSFERING) | |
1091 | #define STATE_NEEDS_WRITING(state) ((state) <= SSTATE_FLUSHING) | |
1092 | #define STATE_NEEDS_CLOSING(state) ((state) == SSTATE_FLUSHING) | |
1093 | ||
1094 | /* Unidirectional transfer. */ | |
1095 | struct unidirectional_transfer { | |
1096 | /* Source */ | |
1097 | int src; | |
1098 | /* Destination */ | |
1099 | int dest; | |
1100 | /* Is source socket? */ | |
1101 | int src_is_sock; | |
1102 | /* Is destination socket? */ | |
1103 | int dest_is_sock; | |
41ccfdd9 | 1104 | /* Transfer state (TRANSFERRING/FLUSHING/FINISHED) */ |
419f37db IL |
1105 | int state; |
1106 | /* Buffer. */ | |
1107 | char buf[BUFFERSIZE]; | |
1108 | /* Buffer used. */ | |
1109 | size_t bufuse; | |
1110 | /* Name of source. */ | |
1111 | const char *src_name; | |
1112 | /* Name of destination. */ | |
1113 | const char *dest_name; | |
1114 | }; | |
1115 | ||
1116 | /* Closes the target (for writing) if transfer has finished. */ | |
1117 | static void udt_close_if_finished(struct unidirectional_transfer *t) | |
1118 | { | |
1119 | if (STATE_NEEDS_CLOSING(t->state) && !t->bufuse) { | |
1120 | t->state = SSTATE_FINISHED; | |
1121 | if (t->dest_is_sock) | |
1122 | shutdown(t->dest, SHUT_WR); | |
1123 | else | |
1124 | close(t->dest); | |
1125 | transfer_debug("Closed %s.", t->dest_name); | |
1126 | } | |
1127 | } | |
1128 | ||
1129 | /* | |
1130 | * Tries to read read data from source into buffer. If buffer is full, | |
1131 | * no data is read. Returns 0 on success, -1 on error. | |
1132 | */ | |
1133 | static int udt_do_read(struct unidirectional_transfer *t) | |
1134 | { | |
1135 | ssize_t bytes; | |
1136 | ||
1137 | if (t->bufuse == BUFFERSIZE) | |
1138 | return 0; /* No space for more. */ | |
1139 | ||
1140 | transfer_debug("%s is readable", t->src_name); | |
1141 | bytes = read(t->src, t->buf + t->bufuse, BUFFERSIZE - t->bufuse); | |
1142 | if (bytes < 0 && errno != EWOULDBLOCK && errno != EAGAIN && | |
1143 | errno != EINTR) { | |
1144 | error("read(%s) failed: %s", t->src_name, strerror(errno)); | |
1145 | return -1; | |
1146 | } else if (bytes == 0) { | |
1147 | transfer_debug("%s EOF (with %i bytes in buffer)", | |
4621085b | 1148 | t->src_name, (int)t->bufuse); |
419f37db IL |
1149 | t->state = SSTATE_FLUSHING; |
1150 | } else if (bytes > 0) { | |
1151 | t->bufuse += bytes; | |
1152 | transfer_debug("Read %i bytes from %s (buffer now at %i)", | |
1153 | (int)bytes, t->src_name, (int)t->bufuse); | |
1154 | } | |
1155 | return 0; | |
1156 | } | |
1157 | ||
1158 | /* Tries to write data from buffer into destination. If buffer is empty, | |
1159 | * no data is written. Returns 0 on success, -1 on error. | |
1160 | */ | |
1161 | static int udt_do_write(struct unidirectional_transfer *t) | |
1162 | { | |
803dbdb9 | 1163 | ssize_t bytes; |
419f37db IL |
1164 | |
1165 | if (t->bufuse == 0) | |
1166 | return 0; /* Nothing to write. */ | |
1167 | ||
1168 | transfer_debug("%s is writable", t->dest_name); | |
7edc02f4 EFL |
1169 | bytes = xwrite(t->dest, t->buf, t->bufuse); |
1170 | if (bytes < 0 && errno != EWOULDBLOCK) { | |
419f37db IL |
1171 | error("write(%s) failed: %s", t->dest_name, strerror(errno)); |
1172 | return -1; | |
1173 | } else if (bytes > 0) { | |
1174 | t->bufuse -= bytes; | |
1175 | if (t->bufuse) | |
1176 | memmove(t->buf, t->buf + bytes, t->bufuse); | |
1177 | transfer_debug("Wrote %i bytes to %s (buffer now at %i)", | |
1178 | (int)bytes, t->dest_name, (int)t->bufuse); | |
1179 | } | |
1180 | return 0; | |
1181 | } | |
1182 | ||
1183 | ||
1184 | /* State of bidirectional transfer loop. */ | |
1185 | struct bidirectional_transfer_state { | |
1186 | /* Direction from program to git. */ | |
1187 | struct unidirectional_transfer ptg; | |
1188 | /* Direction from git to program. */ | |
1189 | struct unidirectional_transfer gtp; | |
1190 | }; | |
1191 | ||
1192 | static void *udt_copy_task_routine(void *udt) | |
1193 | { | |
1194 | struct unidirectional_transfer *t = (struct unidirectional_transfer *)udt; | |
1195 | while (t->state != SSTATE_FINISHED) { | |
1196 | if (STATE_NEEDS_READING(t->state)) | |
1197 | if (udt_do_read(t)) | |
1198 | return NULL; | |
1199 | if (STATE_NEEDS_WRITING(t->state)) | |
1200 | if (udt_do_write(t)) | |
1201 | return NULL; | |
1202 | if (STATE_NEEDS_CLOSING(t->state)) | |
1203 | udt_close_if_finished(t); | |
1204 | } | |
1205 | return udt; /* Just some non-NULL value. */ | |
1206 | } | |
1207 | ||
1208 | #ifndef NO_PTHREADS | |
1209 | ||
1210 | /* | |
98e023de | 1211 | * Join thread, with appropriate errors on failure. Name is name for the |
419f37db IL |
1212 | * thread (for error messages). Returns 0 on success, 1 on failure. |
1213 | */ | |
1214 | static int tloop_join(pthread_t thread, const char *name) | |
1215 | { | |
1216 | int err; | |
1217 | void *tret; | |
1218 | err = pthread_join(thread, &tret); | |
1219 | if (!tret) { | |
1220 | error("%s thread failed", name); | |
1221 | return 1; | |
1222 | } | |
1223 | if (err) { | |
1224 | error("%s thread failed to join: %s", name, strerror(err)); | |
1225 | return 1; | |
1226 | } | |
1227 | return 0; | |
1228 | } | |
1229 | ||
1230 | /* | |
1231 | * Spawn the transfer tasks and then wait for them. Returns 0 on success, | |
1232 | * -1 on failure. | |
1233 | */ | |
1234 | static int tloop_spawnwait_tasks(struct bidirectional_transfer_state *s) | |
1235 | { | |
1236 | pthread_t gtp_thread; | |
1237 | pthread_t ptg_thread; | |
1238 | int err; | |
1239 | int ret = 0; | |
1240 | err = pthread_create(>p_thread, NULL, udt_copy_task_routine, | |
1241 | &s->gtp); | |
1242 | if (err) | |
1243 | die("Can't start thread for copying data: %s", strerror(err)); | |
1244 | err = pthread_create(&ptg_thread, NULL, udt_copy_task_routine, | |
1245 | &s->ptg); | |
1246 | if (err) | |
1247 | die("Can't start thread for copying data: %s", strerror(err)); | |
1248 | ||
1249 | ret |= tloop_join(gtp_thread, "Git to program copy"); | |
1250 | ret |= tloop_join(ptg_thread, "Program to git copy"); | |
1251 | return ret; | |
1252 | } | |
1253 | #else | |
1254 | ||
1255 | /* Close the source and target (for writing) for transfer. */ | |
1256 | static void udt_kill_transfer(struct unidirectional_transfer *t) | |
1257 | { | |
1258 | t->state = SSTATE_FINISHED; | |
1259 | /* | |
1260 | * Socket read end left open isn't a disaster if nobody | |
1261 | * attempts to read from it (mingw compat headers do not | |
1262 | * have SHUT_RD)... | |
1263 | * | |
1264 | * We can't fully close the socket since otherwise gtp | |
1265 | * task would first close the socket it sends data to | |
1266 | * while closing the ptg file descriptors. | |
1267 | */ | |
1268 | if (!t->src_is_sock) | |
1269 | close(t->src); | |
1270 | if (t->dest_is_sock) | |
1271 | shutdown(t->dest, SHUT_WR); | |
1272 | else | |
1273 | close(t->dest); | |
1274 | } | |
1275 | ||
1276 | /* | |
98e023de | 1277 | * Join process, with appropriate errors on failure. Name is name for the |
419f37db IL |
1278 | * process (for error messages). Returns 0 on success, 1 on failure. |
1279 | */ | |
1280 | static int tloop_join(pid_t pid, const char *name) | |
1281 | { | |
1282 | int tret; | |
1283 | if (waitpid(pid, &tret, 0) < 0) { | |
1284 | error("%s process failed to wait: %s", name, strerror(errno)); | |
1285 | return 1; | |
1286 | } | |
1287 | if (!WIFEXITED(tret) || WEXITSTATUS(tret)) { | |
1288 | error("%s process failed", name); | |
1289 | return 1; | |
1290 | } | |
1291 | return 0; | |
1292 | } | |
1293 | ||
1294 | /* | |
1295 | * Spawn the transfer tasks and then wait for them. Returns 0 on success, | |
1296 | * -1 on failure. | |
1297 | */ | |
1298 | static int tloop_spawnwait_tasks(struct bidirectional_transfer_state *s) | |
1299 | { | |
1300 | pid_t pid1, pid2; | |
1301 | int ret = 0; | |
1302 | ||
1303 | /* Fork thread #1: git to program. */ | |
1304 | pid1 = fork(); | |
1305 | if (pid1 < 0) | |
1306 | die_errno("Can't start thread for copying data"); | |
1307 | else if (pid1 == 0) { | |
1308 | udt_kill_transfer(&s->ptg); | |
1309 | exit(udt_copy_task_routine(&s->gtp) ? 0 : 1); | |
1310 | } | |
1311 | ||
1312 | /* Fork thread #2: program to git. */ | |
1313 | pid2 = fork(); | |
1314 | if (pid2 < 0) | |
1315 | die_errno("Can't start thread for copying data"); | |
1316 | else if (pid2 == 0) { | |
1317 | udt_kill_transfer(&s->gtp); | |
1318 | exit(udt_copy_task_routine(&s->ptg) ? 0 : 1); | |
1319 | } | |
1320 | ||
1321 | /* | |
1322 | * Close both streams in parent as to not interfere with | |
1323 | * end of file detection and wait for both tasks to finish. | |
1324 | */ | |
1325 | udt_kill_transfer(&s->gtp); | |
1326 | udt_kill_transfer(&s->ptg); | |
1327 | ret |= tloop_join(pid1, "Git to program copy"); | |
1328 | ret |= tloop_join(pid2, "Program to git copy"); | |
1329 | return ret; | |
1330 | } | |
1331 | #endif | |
1332 | ||
1333 | /* | |
1334 | * Copies data from stdin to output and from input to stdout simultaneously. | |
1335 | * Additionally filtering through given filter. If filter is NULL, uses | |
1336 | * identity filter. | |
1337 | */ | |
1338 | int bidirectional_transfer_loop(int input, int output) | |
1339 | { | |
1340 | struct bidirectional_transfer_state state; | |
1341 | ||
1342 | /* Fill the state fields. */ | |
1343 | state.ptg.src = input; | |
1344 | state.ptg.dest = 1; | |
1345 | state.ptg.src_is_sock = (input == output); | |
1346 | state.ptg.dest_is_sock = 0; | |
1347 | state.ptg.state = SSTATE_TRANSFERING; | |
1348 | state.ptg.bufuse = 0; | |
1349 | state.ptg.src_name = "remote input"; | |
1350 | state.ptg.dest_name = "stdout"; | |
1351 | ||
1352 | state.gtp.src = 0; | |
1353 | state.gtp.dest = output; | |
1354 | state.gtp.src_is_sock = 0; | |
1355 | state.gtp.dest_is_sock = (input == output); | |
1356 | state.gtp.state = SSTATE_TRANSFERING; | |
1357 | state.gtp.bufuse = 0; | |
1358 | state.gtp.src_name = "stdin"; | |
1359 | state.gtp.dest_name = "remote output"; | |
1360 | ||
1361 | return tloop_spawnwait_tasks(&state); | |
1362 | } |