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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 | ||
121 | helper = xcalloc(1, sizeof(*helper)); | |
122 | helper->in = -1; | |
123 | helper->out = -1; | |
124 | helper->err = 0; | |
e0ab2ac6 JK |
125 | argv_array_pushf(&helper->args, "git-remote-%s", data->name); |
126 | argv_array_push(&helper->args, transport->remote->name); | |
127 | argv_array_push(&helper->args, remove_ext_force(transport->url)); | |
6b02de3b IL |
128 | helper->git_cmd = 0; |
129 | helper->silent_exec_failure = 1; | |
e1735872 DI |
130 | |
131 | snprintf(git_dir_buf, sizeof(git_dir_buf), "%s=%s", GIT_DIR_ENVIRONMENT, get_git_dir()); | |
132 | helper->env = helper_env; | |
133 | ||
6b02de3b IL |
134 | code = start_command(helper); |
135 | if (code < 0 && errno == ENOENT) | |
136 | die("Unable to find remote helper for '%s'", data->name); | |
137 | else if (code != 0) | |
138 | exit(code); | |
139 | ||
6eb996b5 | 140 | data->helper = helper; |
fa8c097c | 141 | data->no_disconnect_req = 0; |
6eb996b5 | 142 | |
61b075bd IL |
143 | /* |
144 | * Open the output as FILE* so strbuf_getline() can be used. | |
145 | * Do this with duped fd because fclose() will close the fd, | |
146 | * and stuff like taking over will require the fd to remain. | |
61b075bd IL |
147 | */ |
148 | duped = dup(helper->out); | |
149 | if (duped < 0) | |
150 | die_errno("Can't dup helper output fd"); | |
151 | data->out = xfdopen(duped, "r"); | |
152 | ||
bf3c523c | 153 | write_constant(helper->in, "capabilities\n"); |
2d14d65c | 154 | |
6eb996b5 | 155 | while (1) { |
28ed5b35 IL |
156 | const char *capname; |
157 | int mandatory = 0; | |
5931b33e FC |
158 | if (recvline(data, &buf)) |
159 | exit(128); | |
6eb996b5 DB |
160 | |
161 | if (!*buf.buf) | |
162 | break; | |
28ed5b35 IL |
163 | |
164 | if (*buf.buf == '*') { | |
165 | capname = buf.buf + 1; | |
166 | mandatory = 1; | |
167 | } else | |
168 | capname = buf.buf; | |
169 | ||
bf3c523c | 170 | if (debug) |
28ed5b35 IL |
171 | fprintf(stderr, "Debug: Got cap %s\n", capname); |
172 | if (!strcmp(capname, "fetch")) | |
6eb996b5 | 173 | data->fetch = 1; |
28ed5b35 | 174 | else if (!strcmp(capname, "option")) |
ef08ef9e | 175 | data->option = 1; |
28ed5b35 | 176 | else if (!strcmp(capname, "push")) |
ae4efe19 | 177 | data->push = 1; |
28ed5b35 | 178 | else if (!strcmp(capname, "import")) |
e65e91ed | 179 | data->import = 1; |
bfc366d9 FA |
180 | else if (!strcmp(capname, "bidi-import")) |
181 | data->bidi_import = 1; | |
73b49a75 SR |
182 | else if (!strcmp(capname, "export")) |
183 | data->export = 1; | |
9ba38048 NTND |
184 | else if (!strcmp(capname, "check-connectivity")) |
185 | data->check_connectivity = 1; | |
59556548 | 186 | else if (!data->refspecs && starts_with(capname, "refspec ")) { |
72ff8943 DB |
187 | ALLOC_GROW(refspecs, |
188 | refspec_nr + 1, | |
189 | refspec_alloc); | |
c28cce55 | 190 | refspecs[refspec_nr++] = xstrdup(capname + strlen("refspec ")); |
fa8c097c IL |
191 | } else if (!strcmp(capname, "connect")) { |
192 | data->connect = 1; | |
0d957a4d JK |
193 | } else if (!strcmp(capname, "signed-tags")) { |
194 | data->signed_tags = 1; | |
59556548 | 195 | } else if (starts_with(capname, "export-marks ")) { |
852e54bc | 196 | data->export_marks = xstrdup(capname + strlen("export-marks ")); |
59556548 | 197 | } else if (starts_with(capname, "import-marks")) { |
852e54bc | 198 | data->import_marks = xstrdup(capname + strlen("import-marks ")); |
59556548 | 199 | } else if (starts_with(capname, "no-private-update")) { |
597b831a | 200 | data->no_private_update = 1; |
28ed5b35 | 201 | } else if (mandatory) { |
9517e6b8 | 202 | die("Unknown mandatory capability %s. This remote " |
82247e9b | 203 | "helper probably needs newer version of Git.", |
28ed5b35 | 204 | capname); |
72ff8943 DB |
205 | } |
206 | } | |
207 | if (refspecs) { | |
208 | int i; | |
209 | data->refspec_nr = refspec_nr; | |
210 | data->refspecs = parse_fetch_refspec(refspec_nr, refspecs); | |
b120ef3e | 211 | for (i = 0; i < refspec_nr; i++) |
72ff8943 | 212 | free((char *)refspecs[i]); |
72ff8943 | 213 | free(refspecs); |
a93b4a09 FC |
214 | } else if (data->import || data->bidi_import || data->export) { |
215 | warning("This remote helper should implement refspec capability."); | |
6eb996b5 | 216 | } |
b962dbdc | 217 | strbuf_release(&buf); |
bf3c523c IL |
218 | if (debug) |
219 | fprintf(stderr, "Debug: Capabilities complete.\n"); | |
6eb996b5 DB |
220 | return data->helper; |
221 | } | |
222 | ||
223 | static int disconnect_helper(struct transport *transport) | |
224 | { | |
225 | struct helper_data *data = transport->data; | |
cc567322 | 226 | int res = 0; |
bf3c523c | 227 | |
6eb996b5 | 228 | if (data->helper) { |
bf3c523c IL |
229 | if (debug) |
230 | fprintf(stderr, "Debug: Disconnecting.\n"); | |
fa8c097c | 231 | if (!data->no_disconnect_req) { |
c34fe630 JK |
232 | /* |
233 | * Ignore write errors; there's nothing we can do, | |
234 | * since we're about to close the pipe anyway. And the | |
235 | * most likely error is EPIPE due to the helper dying | |
236 | * to report an error itself. | |
237 | */ | |
238 | sigchain_push(SIGPIPE, SIG_IGN); | |
239 | xwrite(data->helper->in, "\n", 1); | |
240 | sigchain_pop(SIGPIPE); | |
fa8c097c | 241 | } |
6eb996b5 | 242 | close(data->helper->in); |
61b075bd | 243 | close(data->helper->out); |
292ce46b | 244 | fclose(data->out); |
cc567322 | 245 | res = finish_command(data->helper); |
6eb996b5 DB |
246 | free(data->helper); |
247 | data->helper = NULL; | |
248 | } | |
cc567322 | 249 | return res; |
6eb996b5 DB |
250 | } |
251 | ||
ef08ef9e SP |
252 | static const char *unsupported_options[] = { |
253 | TRANS_OPT_UPLOADPACK, | |
254 | TRANS_OPT_RECEIVEPACK, | |
255 | TRANS_OPT_THIN, | |
256 | TRANS_OPT_KEEP | |
257 | }; | |
23cd01ec | 258 | |
ef08ef9e SP |
259 | static const char *boolean_options[] = { |
260 | TRANS_OPT_THIN, | |
261 | TRANS_OPT_KEEP, | |
262 | TRANS_OPT_FOLLOWTAGS | |
263 | }; | |
264 | ||
265 | static int set_helper_option(struct transport *transport, | |
266 | const char *name, const char *value) | |
267 | { | |
268 | struct helper_data *data = transport->data; | |
ef08ef9e SP |
269 | struct strbuf buf = STRBUF_INIT; |
270 | int i, ret, is_bool = 0; | |
271 | ||
bf3c523c IL |
272 | get_helper(transport); |
273 | ||
ef08ef9e SP |
274 | if (!data->option) |
275 | return 1; | |
276 | ||
277 | for (i = 0; i < ARRAY_SIZE(unsupported_options); i++) { | |
278 | if (!strcmp(name, unsupported_options[i])) | |
279 | return 1; | |
280 | } | |
281 | ||
282 | for (i = 0; i < ARRAY_SIZE(boolean_options); i++) { | |
283 | if (!strcmp(name, boolean_options[i])) { | |
284 | is_bool = 1; | |
285 | break; | |
286 | } | |
287 | } | |
288 | ||
289 | strbuf_addf(&buf, "option %s ", name); | |
290 | if (is_bool) | |
291 | strbuf_addstr(&buf, value ? "true" : "false"); | |
292 | else | |
293 | quote_c_style(value, &buf, NULL, 0); | |
294 | strbuf_addch(&buf, '\n'); | |
295 | ||
4a1b59c8 | 296 | sendline(data, &buf); |
5931b33e FC |
297 | if (recvline(data, &buf)) |
298 | exit(128); | |
ef08ef9e SP |
299 | |
300 | if (!strcmp(buf.buf, "ok")) | |
301 | ret = 0; | |
59556548 | 302 | else if (starts_with(buf.buf, "error")) { |
ef08ef9e SP |
303 | ret = -1; |
304 | } else if (!strcmp(buf.buf, "unsupported")) | |
305 | ret = 1; | |
306 | else { | |
307 | warning("%s unexpectedly said: '%s'", data->name, buf.buf); | |
308 | ret = 1; | |
309 | } | |
310 | strbuf_release(&buf); | |
311 | return ret; | |
312 | } | |
313 | ||
314 | static void standard_options(struct transport *t) | |
315 | { | |
316 | char buf[16]; | |
317 | int n; | |
318 | int v = t->verbose; | |
ef08ef9e | 319 | |
d01b3c02 | 320 | set_helper_option(t, "progress", t->progress ? "true" : "false"); |
ef08ef9e SP |
321 | |
322 | n = snprintf(buf, sizeof(buf), "%d", v + 1); | |
323 | if (n >= sizeof(buf)) | |
324 | die("impossibly large verbosity value"); | |
325 | set_helper_option(t, "verbosity", buf); | |
326 | } | |
327 | ||
f2a37151 DB |
328 | static int release_helper(struct transport *transport) |
329 | { | |
cc567322 | 330 | int res = 0; |
72ff8943 DB |
331 | struct helper_data *data = transport->data; |
332 | free_refspec(data->refspec_nr, data->refspecs); | |
333 | data->refspecs = NULL; | |
cc567322 | 334 | res = disconnect_helper(transport); |
f2a37151 | 335 | free(transport->data); |
cc567322 | 336 | return res; |
f2a37151 DB |
337 | } |
338 | ||
6eb996b5 | 339 | static int fetch_with_fetch(struct transport *transport, |
37148311 | 340 | int nr_heads, struct ref **to_fetch) |
6eb996b5 | 341 | { |
292ce46b | 342 | struct helper_data *data = transport->data; |
6eb996b5 DB |
343 | int i; |
344 | struct strbuf buf = STRBUF_INIT; | |
345 | ||
ef08ef9e | 346 | standard_options(transport); |
9ba38048 NTND |
347 | if (data->check_connectivity && |
348 | data->transport_options.check_self_contained_and_connected) | |
349 | set_helper_option(transport, "check-connectivity", "true"); | |
ef08ef9e | 350 | |
16094885 NTND |
351 | if (transport->cloning) |
352 | set_helper_option(transport, "cloning", "true"); | |
353 | ||
354 | if (data->transport_options.update_shallow) | |
355 | set_helper_option(transport, "update-shallow", "true"); | |
356 | ||
6eb996b5 | 357 | for (i = 0; i < nr_heads; i++) { |
1088261f | 358 | const struct ref *posn = to_fetch[i]; |
6eb996b5 DB |
359 | if (posn->status & REF_STATUS_UPTODATE) |
360 | continue; | |
2d14d65c DB |
361 | |
362 | strbuf_addf(&buf, "fetch %s %s\n", | |
363 | sha1_to_hex(posn->old_sha1), posn->name); | |
292ce46b | 364 | } |
2d14d65c | 365 | |
292ce46b | 366 | strbuf_addch(&buf, '\n'); |
bf3c523c | 367 | sendline(data, &buf); |
292ce46b SP |
368 | |
369 | while (1) { | |
5931b33e FC |
370 | if (recvline(data, &buf)) |
371 | exit(128); | |
292ce46b | 372 | |
59556548 | 373 | if (starts_with(buf.buf, "lock ")) { |
292ce46b SP |
374 | const char *name = buf.buf + 5; |
375 | if (transport->pack_lockfile) | |
376 | warning("%s also locked %s", data->name, name); | |
377 | else | |
378 | transport->pack_lockfile = xstrdup(name); | |
379 | } | |
9ba38048 NTND |
380 | else if (data->check_connectivity && |
381 | data->transport_options.check_self_contained_and_connected && | |
382 | !strcmp(buf.buf, "connectivity-ok")) | |
383 | data->transport_options.self_contained_and_connected = 1; | |
292ce46b SP |
384 | else if (!buf.len) |
385 | break; | |
386 | else | |
387 | warning("%s unexpectedly said: '%s'", data->name, buf.buf); | |
6eb996b5 | 388 | } |
292ce46b | 389 | strbuf_release(&buf); |
6eb996b5 DB |
390 | return 0; |
391 | } | |
392 | ||
e65e91ed DB |
393 | static int get_importer(struct transport *transport, struct child_process *fastimport) |
394 | { | |
395 | struct child_process *helper = get_helper(transport); | |
bfc366d9 FA |
396 | struct helper_data *data = transport->data; |
397 | struct argv_array argv = ARGV_ARRAY_INIT; | |
398 | int cat_blob_fd, code; | |
e65e91ed DB |
399 | memset(fastimport, 0, sizeof(*fastimport)); |
400 | fastimport->in = helper->out; | |
bfc366d9 | 401 | argv_array_push(&argv, "fast-import"); |
19ba02af | 402 | argv_array_push(&argv, debug ? "--stats" : "--quiet"); |
e65e91ed | 403 | |
bfc366d9 FA |
404 | if (data->bidi_import) { |
405 | cat_blob_fd = xdup(helper->in); | |
406 | argv_array_pushf(&argv, "--cat-blob-fd=%d", cat_blob_fd); | |
407 | } | |
408 | fastimport->argv = argv.argv; | |
e65e91ed | 409 | fastimport->git_cmd = 1; |
bfc366d9 FA |
410 | |
411 | code = start_command(fastimport); | |
412 | return code; | |
e65e91ed DB |
413 | } |
414 | ||
73b49a75 SR |
415 | static int get_exporter(struct transport *transport, |
416 | struct child_process *fastexport, | |
73b49a75 SR |
417 | struct string_list *revlist_args) |
418 | { | |
a515ebe9 | 419 | struct helper_data *data = transport->data; |
73b49a75 | 420 | struct child_process *helper = get_helper(transport); |
2aeae40a | 421 | int i; |
852e54bc | 422 | |
73b49a75 SR |
423 | memset(fastexport, 0, sizeof(*fastexport)); |
424 | ||
425 | /* we need to duplicate helper->in because we want to use it after | |
426 | * fastexport is done with it. */ | |
427 | fastexport->out = dup(helper->in); | |
2aeae40a JK |
428 | argv_array_push(&fastexport->args, "fast-export"); |
429 | argv_array_push(&fastexport->args, "--use-done-feature"); | |
430 | argv_array_push(&fastexport->args, data->signed_tags ? | |
431 | "--signed-tags=verbatim" : "--signed-tags=warn-strip"); | |
432 | if (data->export_marks) | |
433 | argv_array_pushf(&fastexport->args, "--export-marks=%s.tmp", data->export_marks); | |
434 | if (data->import_marks) | |
435 | argv_array_pushf(&fastexport->args, "--import-marks=%s", data->import_marks); | |
73b49a75 SR |
436 | |
437 | for (i = 0; i < revlist_args->nr; i++) | |
2aeae40a | 438 | argv_array_push(&fastexport->args, revlist_args->items[i].string); |
73b49a75 SR |
439 | |
440 | fastexport->git_cmd = 1; | |
441 | return start_command(fastexport); | |
442 | } | |
443 | ||
e65e91ed DB |
444 | static int fetch_with_import(struct transport *transport, |
445 | int nr_heads, struct ref **to_fetch) | |
446 | { | |
447 | struct child_process fastimport; | |
72ff8943 | 448 | struct helper_data *data = transport->data; |
e65e91ed DB |
449 | int i; |
450 | struct ref *posn; | |
451 | struct strbuf buf = STRBUF_INIT; | |
452 | ||
bf3c523c IL |
453 | get_helper(transport); |
454 | ||
e65e91ed DB |
455 | if (get_importer(transport, &fastimport)) |
456 | die("Couldn't run fast-import"); | |
457 | ||
458 | for (i = 0; i < nr_heads; i++) { | |
459 | posn = to_fetch[i]; | |
460 | if (posn->status & REF_STATUS_UPTODATE) | |
461 | continue; | |
462 | ||
463 | strbuf_addf(&buf, "import %s\n", posn->name); | |
bf3c523c | 464 | sendline(data, &buf); |
e65e91ed DB |
465 | strbuf_reset(&buf); |
466 | } | |
9504bc9d SR |
467 | |
468 | write_constant(data->helper->in, "\n"); | |
bfc366d9 FA |
469 | /* |
470 | * remote-helpers that advertise the bidi-import capability are required to | |
471 | * buffer the complete batch of import commands until this newline before | |
472 | * sending data to fast-import. | |
473 | * These helpers read back data from fast-import on their stdin, which could | |
474 | * be mixed with import commands, otherwise. | |
475 | */ | |
9504bc9d | 476 | |
cc567322 SR |
477 | if (finish_command(&fastimport)) |
478 | die("Error while running fast-import"); | |
bfc366d9 | 479 | argv_array_free_detached(fastimport.argv); |
e65e91ed | 480 | |
dff9d65d FA |
481 | /* |
482 | * The fast-import stream of a remote helper that advertises | |
483 | * the "refspec" capability writes to the refs named after the | |
484 | * right hand side of the first refspec matching each ref we | |
485 | * were fetching. | |
486 | * | |
487 | * (If no "refspec" capability was specified, for historical | |
7a43c554 | 488 | * reasons we default to the equivalent of *:*.) |
dff9d65d FA |
489 | * |
490 | * Store the result in to_fetch[i].old_sha1. Callers such | |
491 | * as "git fetch" can use the value to write feedback to the | |
492 | * terminal, populate FETCH_HEAD, and determine what new value | |
493 | * should be written to peer_ref if the update is a | |
494 | * fast-forward or this is a forced update. | |
495 | */ | |
e65e91ed | 496 | for (i = 0; i < nr_heads; i++) { |
72ff8943 | 497 | char *private; |
e65e91ed DB |
498 | posn = to_fetch[i]; |
499 | if (posn->status & REF_STATUS_UPTODATE) | |
500 | continue; | |
72ff8943 DB |
501 | if (data->refspecs) |
502 | private = apply_refspecs(data->refspecs, data->refspec_nr, posn->name); | |
503 | else | |
c28cce55 | 504 | private = xstrdup(posn->name); |
d51b720f MH |
505 | if (private) { |
506 | read_ref(private, posn->old_sha1); | |
507 | free(private); | |
508 | } | |
e65e91ed | 509 | } |
b962dbdc | 510 | strbuf_release(&buf); |
e65e91ed DB |
511 | return 0; |
512 | } | |
513 | ||
fa8c097c IL |
514 | static int process_connect_service(struct transport *transport, |
515 | const char *name, const char *exec) | |
516 | { | |
517 | struct helper_data *data = transport->data; | |
518 | struct strbuf cmdbuf = STRBUF_INIT; | |
519 | struct child_process *helper; | |
520 | int r, duped, ret = 0; | |
521 | FILE *input; | |
522 | ||
523 | helper = get_helper(transport); | |
524 | ||
525 | /* | |
526 | * Yes, dup the pipe another time, as we need unbuffered version | |
527 | * of input pipe as FILE*. fclose() closes the underlying fd and | |
528 | * stream buffering only can be changed before first I/O operation | |
529 | * on it. | |
530 | */ | |
531 | duped = dup(helper->out); | |
532 | if (duped < 0) | |
533 | die_errno("Can't dup helper output fd"); | |
534 | input = xfdopen(duped, "r"); | |
535 | setvbuf(input, NULL, _IONBF, 0); | |
536 | ||
537 | /* | |
538 | * Handle --upload-pack and friends. This is fire and forget... | |
539 | * just warn if it fails. | |
540 | */ | |
541 | if (strcmp(name, exec)) { | |
542 | r = set_helper_option(transport, "servpath", exec); | |
543 | if (r > 0) | |
544 | warning("Setting remote service path not supported by protocol."); | |
545 | else if (r < 0) | |
546 | warning("Invalid remote service path."); | |
547 | } | |
548 | ||
549 | if (data->connect) | |
550 | strbuf_addf(&cmdbuf, "connect %s\n", name); | |
551 | else | |
552 | goto exit; | |
553 | ||
554 | sendline(data, &cmdbuf); | |
5931b33e FC |
555 | if (recvline_fh(input, &cmdbuf, name)) |
556 | exit(128); | |
557 | ||
fa8c097c IL |
558 | if (!strcmp(cmdbuf.buf, "")) { |
559 | data->no_disconnect_req = 1; | |
560 | if (debug) | |
561 | fprintf(stderr, "Debug: Smart transport connection " | |
562 | "ready.\n"); | |
563 | ret = 1; | |
564 | } else if (!strcmp(cmdbuf.buf, "fallback")) { | |
565 | if (debug) | |
566 | fprintf(stderr, "Debug: Falling back to dumb " | |
567 | "transport.\n"); | |
568 | } else | |
569 | die("Unknown response to connect: %s", | |
570 | cmdbuf.buf); | |
571 | ||
572 | exit: | |
573 | fclose(input); | |
574 | return ret; | |
575 | } | |
576 | ||
577 | static int process_connect(struct transport *transport, | |
578 | int for_push) | |
579 | { | |
580 | struct helper_data *data = transport->data; | |
581 | const char *name; | |
582 | const char *exec; | |
583 | ||
584 | name = for_push ? "git-receive-pack" : "git-upload-pack"; | |
585 | if (for_push) | |
586 | exec = data->transport_options.receivepack; | |
587 | else | |
588 | exec = data->transport_options.uploadpack; | |
589 | ||
590 | return process_connect_service(transport, name, exec); | |
591 | } | |
592 | ||
b236752a IL |
593 | static int connect_helper(struct transport *transport, const char *name, |
594 | const char *exec, int fd[2]) | |
595 | { | |
596 | struct helper_data *data = transport->data; | |
597 | ||
598 | /* Get_helper so connect is inited. */ | |
599 | get_helper(transport); | |
600 | if (!data->connect) | |
601 | die("Operation not supported by protocol."); | |
602 | ||
603 | if (!process_connect_service(transport, name, exec)) | |
604 | die("Can't connect to subservice %s.", name); | |
605 | ||
606 | fd[0] = data->helper->out; | |
607 | fd[1] = data->helper->in; | |
608 | return 0; | |
609 | } | |
610 | ||
6eb996b5 | 611 | static int fetch(struct transport *transport, |
37148311 | 612 | int nr_heads, struct ref **to_fetch) |
6eb996b5 DB |
613 | { |
614 | struct helper_data *data = transport->data; | |
615 | int i, count; | |
616 | ||
fa8c097c IL |
617 | if (process_connect(transport, 0)) { |
618 | do_take_over(transport); | |
619 | return transport->fetch(transport, nr_heads, to_fetch); | |
620 | } | |
621 | ||
6eb996b5 DB |
622 | count = 0; |
623 | for (i = 0; i < nr_heads; i++) | |
624 | if (!(to_fetch[i]->status & REF_STATUS_UPTODATE)) | |
625 | count++; | |
626 | ||
627 | if (!count) | |
628 | return 0; | |
629 | ||
630 | if (data->fetch) | |
631 | return fetch_with_fetch(transport, nr_heads, to_fetch); | |
632 | ||
e65e91ed DB |
633 | if (data->import) |
634 | return fetch_with_import(transport, nr_heads, to_fetch); | |
635 | ||
6eb996b5 DB |
636 | return -1; |
637 | } | |
638 | ||
664059fb | 639 | static int push_update_ref_status(struct strbuf *buf, |
d2e73c6f SR |
640 | struct ref **ref, |
641 | struct ref *remote_refs) | |
642 | { | |
643 | char *refname, *msg; | |
f9e3c6be | 644 | int status, forced = 0; |
d2e73c6f | 645 | |
59556548 | 646 | if (starts_with(buf->buf, "ok ")) { |
d2e73c6f SR |
647 | status = REF_STATUS_OK; |
648 | refname = buf->buf + 3; | |
59556548 | 649 | } else if (starts_with(buf->buf, "error ")) { |
d2e73c6f SR |
650 | status = REF_STATUS_REMOTE_REJECT; |
651 | refname = buf->buf + 6; | |
652 | } else | |
82247e9b | 653 | die("expected ok/error, helper said '%s'", buf->buf); |
d2e73c6f SR |
654 | |
655 | msg = strchr(refname, ' '); | |
656 | if (msg) { | |
657 | struct strbuf msg_buf = STRBUF_INIT; | |
658 | const char *end; | |
659 | ||
660 | *msg++ = '\0'; | |
661 | if (!unquote_c_style(&msg_buf, msg, &end)) | |
662 | msg = strbuf_detach(&msg_buf, NULL); | |
663 | else | |
664 | msg = xstrdup(msg); | |
665 | strbuf_release(&msg_buf); | |
666 | ||
667 | if (!strcmp(msg, "no match")) { | |
668 | status = REF_STATUS_NONE; | |
669 | free(msg); | |
670 | msg = NULL; | |
671 | } | |
672 | else if (!strcmp(msg, "up to date")) { | |
673 | status = REF_STATUS_UPTODATE; | |
674 | free(msg); | |
675 | msg = NULL; | |
676 | } | |
677 | else if (!strcmp(msg, "non-fast forward")) { | |
678 | status = REF_STATUS_REJECT_NONFASTFORWARD; | |
679 | free(msg); | |
680 | msg = NULL; | |
681 | } | |
dbfeddb1 CR |
682 | else if (!strcmp(msg, "already exists")) { |
683 | status = REF_STATUS_REJECT_ALREADY_EXISTS; | |
684 | free(msg); | |
685 | msg = NULL; | |
686 | } | |
75e5c0dc JH |
687 | else if (!strcmp(msg, "fetch first")) { |
688 | status = REF_STATUS_REJECT_FETCH_FIRST; | |
689 | free(msg); | |
690 | msg = NULL; | |
691 | } | |
692 | else if (!strcmp(msg, "needs force")) { | |
693 | status = REF_STATUS_REJECT_NEEDS_FORCE; | |
694 | free(msg); | |
695 | msg = NULL; | |
696 | } | |
631b5ef2 JH |
697 | else if (!strcmp(msg, "stale info")) { |
698 | status = REF_STATUS_REJECT_STALE; | |
699 | free(msg); | |
700 | msg = NULL; | |
701 | } | |
f9e3c6be FC |
702 | else if (!strcmp(msg, "forced update")) { |
703 | forced = 1; | |
704 | free(msg); | |
705 | msg = NULL; | |
706 | } | |
d2e73c6f SR |
707 | } |
708 | ||
709 | if (*ref) | |
710 | *ref = find_ref_by_name(*ref, refname); | |
711 | if (!*ref) | |
712 | *ref = find_ref_by_name(remote_refs, refname); | |
713 | if (!*ref) { | |
714 | warning("helper reported unexpected status of %s", refname); | |
664059fb | 715 | return 1; |
d2e73c6f SR |
716 | } |
717 | ||
718 | if ((*ref)->status != REF_STATUS_NONE) { | |
719 | /* | |
720 | * Earlier, the ref was marked not to be pushed, so ignore the ref | |
721 | * status reported by the remote helper if the latter is 'no match'. | |
722 | */ | |
723 | if (status == REF_STATUS_NONE) | |
664059fb | 724 | return 1; |
d2e73c6f SR |
725 | } |
726 | ||
727 | (*ref)->status = status; | |
cf31f70c | 728 | (*ref)->forced_update |= forced; |
d2e73c6f | 729 | (*ref)->remote_status = msg; |
126aac5c | 730 | return !(status == REF_STATUS_OK); |
d2e73c6f SR |
731 | } |
732 | ||
0551a06c | 733 | static int push_update_refs_status(struct helper_data *data, |
5a75353f FC |
734 | struct ref *remote_refs, |
735 | int flags) | |
d2e73c6f SR |
736 | { |
737 | struct strbuf buf = STRBUF_INIT; | |
738 | struct ref *ref = remote_refs; | |
0551a06c FC |
739 | int ret = 0; |
740 | ||
d2e73c6f | 741 | for (;;) { |
664059fb FC |
742 | char *private; |
743 | ||
0551a06c FC |
744 | if (recvline(data, &buf)) { |
745 | ret = 1; | |
746 | break; | |
747 | } | |
748 | ||
d2e73c6f SR |
749 | if (!buf.len) |
750 | break; | |
751 | ||
664059fb FC |
752 | if (push_update_ref_status(&buf, &ref, remote_refs)) |
753 | continue; | |
754 | ||
5a75353f | 755 | if (flags & TRANSPORT_PUSH_DRY_RUN || !data->refspecs || data->no_private_update) |
664059fb FC |
756 | continue; |
757 | ||
758 | /* propagate back the update to the remote namespace */ | |
759 | private = apply_refspecs(data->refspecs, data->refspec_nr, ref->name); | |
760 | if (!private) | |
761 | continue; | |
762 | update_ref("update by helper", private, ref->new_sha1, NULL, 0, 0); | |
763 | free(private); | |
d2e73c6f SR |
764 | } |
765 | strbuf_release(&buf); | |
0551a06c | 766 | return ret; |
d2e73c6f SR |
767 | } |
768 | ||
73b49a75 | 769 | static int push_refs_with_push(struct transport *transport, |
05c1eb10 | 770 | struct ref *remote_refs, int flags) |
ae4efe19 SP |
771 | { |
772 | int force_all = flags & TRANSPORT_PUSH_FORCE; | |
773 | int mirror = flags & TRANSPORT_PUSH_MIRROR; | |
774 | struct helper_data *data = transport->data; | |
775 | struct strbuf buf = STRBUF_INIT; | |
ae4efe19 | 776 | struct ref *ref; |
05c1eb10 JH |
777 | struct string_list cas_options = STRING_LIST_INIT_DUP; |
778 | struct string_list_item *cas_option; | |
ae4efe19 | 779 | |
c0aa335c | 780 | get_helper(transport); |
ae4efe19 SP |
781 | if (!data->push) |
782 | return 1; | |
783 | ||
784 | for (ref = remote_refs; ref; ref = ref->next) { | |
20e8b465 | 785 | if (!ref->peer_ref && !mirror) |
ae4efe19 SP |
786 | continue; |
787 | ||
20e8b465 TRC |
788 | /* Check for statuses set by set_ref_status_for_push() */ |
789 | switch (ref->status) { | |
790 | case REF_STATUS_REJECT_NONFASTFORWARD: | |
631b5ef2 | 791 | case REF_STATUS_REJECT_STALE: |
dbfeddb1 | 792 | case REF_STATUS_REJECT_ALREADY_EXISTS: |
20e8b465 | 793 | case REF_STATUS_UPTODATE: |
ae4efe19 | 794 | continue; |
20e8b465 TRC |
795 | default: |
796 | ; /* do nothing */ | |
ae4efe19 SP |
797 | } |
798 | ||
799 | if (force_all) | |
800 | ref->force = 1; | |
801 | ||
802 | strbuf_addstr(&buf, "push "); | |
803 | if (!ref->deletion) { | |
804 | if (ref->force) | |
805 | strbuf_addch(&buf, '+'); | |
806 | if (ref->peer_ref) | |
807 | strbuf_addstr(&buf, ref->peer_ref->name); | |
808 | else | |
809 | strbuf_addstr(&buf, sha1_to_hex(ref->new_sha1)); | |
810 | } | |
811 | strbuf_addch(&buf, ':'); | |
812 | strbuf_addstr(&buf, ref->name); | |
813 | strbuf_addch(&buf, '\n'); | |
05c1eb10 JH |
814 | |
815 | /* | |
816 | * The "--force-with-lease" options without explicit | |
817 | * values to expect have already been expanded into | |
818 | * the ref->old_sha1_expect[] field; we can ignore | |
819 | * transport->smart_options->cas altogether and instead | |
820 | * can enumerate them from the refs. | |
821 | */ | |
822 | if (ref->expect_old_sha1) { | |
823 | struct strbuf cas = STRBUF_INIT; | |
824 | strbuf_addf(&cas, "%s:%s", | |
825 | ref->name, sha1_to_hex(ref->old_sha1_expect)); | |
826 | string_list_append(&cas_options, strbuf_detach(&cas, NULL)); | |
827 | } | |
ae4efe19 | 828 | } |
05c1eb10 JH |
829 | if (buf.len == 0) { |
830 | string_list_clear(&cas_options, 0); | |
d8f67d20 | 831 | return 0; |
05c1eb10 | 832 | } |
ae4efe19 | 833 | |
ae4efe19 | 834 | standard_options(transport); |
05c1eb10 JH |
835 | for_each_string_list_item(cas_option, &cas_options) |
836 | set_helper_option(transport, "cas", cas_option->string); | |
ae4efe19 SP |
837 | |
838 | if (flags & TRANSPORT_PUSH_DRY_RUN) { | |
839 | if (set_helper_option(transport, "dry-run", "true") != 0) | |
840 | die("helper %s does not support dry-run", data->name); | |
841 | } | |
842 | ||
843 | strbuf_addch(&buf, '\n'); | |
bf3c523c | 844 | sendline(data, &buf); |
ae4efe19 | 845 | strbuf_release(&buf); |
d2e73c6f | 846 | |
0551a06c | 847 | return push_update_refs_status(data, remote_refs, flags); |
ae4efe19 SP |
848 | } |
849 | ||
73b49a75 SR |
850 | static int push_refs_with_export(struct transport *transport, |
851 | struct ref *remote_refs, int flags) | |
852 | { | |
853 | struct ref *ref; | |
854 | struct child_process *helper, exporter; | |
855 | struct helper_data *data = transport->data; | |
183113a5 | 856 | struct string_list revlist_args = STRING_LIST_INIT_NODUP; |
73b49a75 SR |
857 | struct strbuf buf = STRBUF_INIT; |
858 | ||
21610d82 FC |
859 | if (!data->refspecs) |
860 | die("remote-helper doesn't support push; refspec needed"); | |
861 | ||
21457f57 FC |
862 | if (flags & TRANSPORT_PUSH_DRY_RUN) { |
863 | if (set_helper_option(transport, "dry-run", "true") != 0) | |
864 | die("helper %s does not support dry-run", data->name); | |
865 | } | |
866 | ||
510fa6f5 FC |
867 | if (flags & TRANSPORT_PUSH_FORCE) { |
868 | if (set_helper_option(transport, "force", "true") != 0) | |
869 | warning("helper %s does not support 'force'", data->name); | |
870 | } | |
871 | ||
73b49a75 SR |
872 | helper = get_helper(transport); |
873 | ||
874 | write_constant(helper->in, "export\n"); | |
875 | ||
73b49a75 SR |
876 | strbuf_reset(&buf); |
877 | ||
878 | for (ref = remote_refs; ref; ref = ref->next) { | |
879 | char *private; | |
880 | unsigned char sha1[20]; | |
881 | ||
9c51558c FC |
882 | if (ref->deletion) |
883 | die("remote-helpers do not support ref deletion"); | |
884 | ||
73b49a75 SR |
885 | private = apply_refspecs(data->refspecs, data->refspec_nr, ref->name); |
886 | if (private && !get_sha1(private, sha1)) { | |
887 | strbuf_addf(&buf, "^%s", private); | |
1d2f80fa | 888 | string_list_append(&revlist_args, strbuf_detach(&buf, NULL)); |
b056620f | 889 | hashcpy(ref->old_sha1, sha1); |
73b49a75 | 890 | } |
2faa1527 | 891 | free(private); |
73b49a75 | 892 | |
67c9c782 FC |
893 | if (ref->peer_ref) { |
894 | if (strcmp(ref->peer_ref->name, ref->name)) | |
895 | die("remote-helpers do not support old:new syntax"); | |
3ea7d094 | 896 | string_list_append(&revlist_args, ref->peer_ref->name); |
67c9c782 | 897 | } |
73b49a75 SR |
898 | } |
899 | ||
a515ebe9 | 900 | if (get_exporter(transport, &exporter, &revlist_args)) |
73b49a75 SR |
901 | die("Couldn't run fast-export"); |
902 | ||
cc567322 SR |
903 | if (finish_command(&exporter)) |
904 | die("Error while running fast-export"); | |
3994e64d FC |
905 | if (push_update_refs_status(data, remote_refs, flags)) |
906 | return 1; | |
907 | ||
908 | if (data->export_marks) { | |
909 | strbuf_addf(&buf, "%s.tmp", data->export_marks); | |
910 | rename(buf.buf, data->export_marks); | |
911 | strbuf_release(&buf); | |
912 | } | |
913 | ||
914 | return 0; | |
73b49a75 SR |
915 | } |
916 | ||
917 | static int push_refs(struct transport *transport, | |
918 | struct ref *remote_refs, int flags) | |
919 | { | |
920 | struct helper_data *data = transport->data; | |
921 | ||
922 | if (process_connect(transport, 1)) { | |
923 | do_take_over(transport); | |
924 | return transport->push_refs(transport, remote_refs, flags); | |
925 | } | |
926 | ||
927 | if (!remote_refs) { | |
928 | fprintf(stderr, "No refs in common and none specified; doing nothing.\n" | |
929 | "Perhaps you should specify a branch such as 'master'.\n"); | |
930 | return 0; | |
931 | } | |
932 | ||
933 | if (data->push) | |
934 | return push_refs_with_push(transport, remote_refs, flags); | |
935 | ||
936 | if (data->export) | |
937 | return push_refs_with_export(transport, remote_refs, flags); | |
938 | ||
939 | return -1; | |
940 | } | |
941 | ||
942 | ||
f8ec9167 DB |
943 | static int has_attribute(const char *attrs, const char *attr) { |
944 | int len; | |
945 | if (!attrs) | |
946 | return 0; | |
947 | ||
948 | len = strlen(attr); | |
949 | for (;;) { | |
950 | const char *space = strchrnul(attrs, ' '); | |
951 | if (len == space - attrs && !strncmp(attrs, attr, len)) | |
952 | return 1; | |
953 | if (!*space) | |
954 | return 0; | |
955 | attrs = space + 1; | |
956 | } | |
957 | } | |
958 | ||
6eb996b5 DB |
959 | static struct ref *get_refs_list(struct transport *transport, int for_push) |
960 | { | |
292ce46b | 961 | struct helper_data *data = transport->data; |
6eb996b5 DB |
962 | struct child_process *helper; |
963 | struct ref *ret = NULL; | |
964 | struct ref **tail = &ret; | |
965 | struct ref *posn; | |
966 | struct strbuf buf = STRBUF_INIT; | |
6eb996b5 DB |
967 | |
968 | helper = get_helper(transport); | |
2d14d65c | 969 | |
fa8c097c IL |
970 | if (process_connect(transport, for_push)) { |
971 | do_take_over(transport); | |
972 | return transport->get_refs_list(transport, for_push); | |
973 | } | |
974 | ||
ae4efe19 SP |
975 | if (data->push && for_push) |
976 | write_str_in_full(helper->in, "list for-push\n"); | |
977 | else | |
978 | write_str_in_full(helper->in, "list\n"); | |
6eb996b5 | 979 | |
6eb996b5 DB |
980 | while (1) { |
981 | char *eov, *eon; | |
5931b33e FC |
982 | if (recvline(data, &buf)) |
983 | exit(128); | |
6eb996b5 DB |
984 | |
985 | if (!*buf.buf) | |
986 | break; | |
987 | ||
988 | eov = strchr(buf.buf, ' '); | |
989 | if (!eov) | |
990 | die("Malformed response in ref list: %s", buf.buf); | |
991 | eon = strchr(eov + 1, ' '); | |
992 | *eov = '\0'; | |
993 | if (eon) | |
994 | *eon = '\0'; | |
995 | *tail = alloc_ref(eov + 1); | |
996 | if (buf.buf[0] == '@') | |
997 | (*tail)->symref = xstrdup(buf.buf + 1); | |
998 | else if (buf.buf[0] != '?') | |
999 | get_sha1_hex(buf.buf, (*tail)->old_sha1); | |
f8ec9167 DB |
1000 | if (eon) { |
1001 | if (has_attribute(eon + 1, "unchanged")) { | |
1002 | (*tail)->status |= REF_STATUS_UPTODATE; | |
1003 | read_ref((*tail)->name, (*tail)->old_sha1); | |
1004 | } | |
1005 | } | |
6eb996b5 DB |
1006 | tail = &((*tail)->next); |
1007 | } | |
bf3c523c IL |
1008 | if (debug) |
1009 | fprintf(stderr, "Debug: Read ref listing.\n"); | |
6eb996b5 DB |
1010 | strbuf_release(&buf); |
1011 | ||
1012 | for (posn = ret; posn; posn = posn->next) | |
1013 | resolve_remote_symref(posn, ret); | |
1014 | ||
1015 | return ret; | |
1016 | } | |
1017 | ||
c9e388bb | 1018 | int transport_helper_init(struct transport *transport, const char *name) |
6eb996b5 DB |
1019 | { |
1020 | struct helper_data *data = xcalloc(sizeof(*data), 1); | |
c9e388bb | 1021 | data->name = name; |
6eb996b5 | 1022 | |
bf3c523c IL |
1023 | if (getenv("GIT_TRANSPORT_HELPER_DEBUG")) |
1024 | debug = 1; | |
1025 | ||
6eb996b5 | 1026 | transport->data = data; |
ef08ef9e | 1027 | transport->set_option = set_helper_option; |
6eb996b5 DB |
1028 | transport->get_refs_list = get_refs_list; |
1029 | transport->fetch = fetch; | |
ae4efe19 | 1030 | transport->push_refs = push_refs; |
f2a37151 | 1031 | transport->disconnect = release_helper; |
b236752a | 1032 | transport->connect = connect_helper; |
61b075bd | 1033 | transport->smart_options = &(data->transport_options); |
6eb996b5 DB |
1034 | return 0; |
1035 | } | |
419f37db IL |
1036 | |
1037 | /* | |
1038 | * Linux pipes can buffer 65536 bytes at once (and most platforms can | |
1039 | * buffer less), so attempt reads and writes with up to that size. | |
1040 | */ | |
1041 | #define BUFFERSIZE 65536 | |
1042 | /* This should be enough to hold debugging message. */ | |
1043 | #define PBUFFERSIZE 8192 | |
1044 | ||
1045 | /* Print bidirectional transfer loop debug message. */ | |
4621085b | 1046 | __attribute__((format (printf, 1, 2))) |
419f37db IL |
1047 | static void transfer_debug(const char *fmt, ...) |
1048 | { | |
1049 | va_list args; | |
1050 | char msgbuf[PBUFFERSIZE]; | |
1051 | static int debug_enabled = -1; | |
1052 | ||
1053 | if (debug_enabled < 0) | |
1054 | debug_enabled = getenv("GIT_TRANSLOOP_DEBUG") ? 1 : 0; | |
1055 | if (!debug_enabled) | |
1056 | return; | |
1057 | ||
1058 | va_start(args, fmt); | |
1059 | vsnprintf(msgbuf, PBUFFERSIZE, fmt, args); | |
1060 | va_end(args); | |
1061 | fprintf(stderr, "Transfer loop debugging: %s\n", msgbuf); | |
1062 | } | |
1063 | ||
1064 | /* Stream state: More data may be coming in this direction. */ | |
1065 | #define SSTATE_TRANSFERING 0 | |
1066 | /* | |
1067 | * Stream state: No more data coming in this direction, flushing rest of | |
1068 | * data. | |
1069 | */ | |
1070 | #define SSTATE_FLUSHING 1 | |
1071 | /* Stream state: Transfer in this direction finished. */ | |
1072 | #define SSTATE_FINISHED 2 | |
1073 | ||
1074 | #define STATE_NEEDS_READING(state) ((state) <= SSTATE_TRANSFERING) | |
1075 | #define STATE_NEEDS_WRITING(state) ((state) <= SSTATE_FLUSHING) | |
1076 | #define STATE_NEEDS_CLOSING(state) ((state) == SSTATE_FLUSHING) | |
1077 | ||
1078 | /* Unidirectional transfer. */ | |
1079 | struct unidirectional_transfer { | |
1080 | /* Source */ | |
1081 | int src; | |
1082 | /* Destination */ | |
1083 | int dest; | |
1084 | /* Is source socket? */ | |
1085 | int src_is_sock; | |
1086 | /* Is destination socket? */ | |
1087 | int dest_is_sock; | |
41ccfdd9 | 1088 | /* Transfer state (TRANSFERRING/FLUSHING/FINISHED) */ |
419f37db IL |
1089 | int state; |
1090 | /* Buffer. */ | |
1091 | char buf[BUFFERSIZE]; | |
1092 | /* Buffer used. */ | |
1093 | size_t bufuse; | |
1094 | /* Name of source. */ | |
1095 | const char *src_name; | |
1096 | /* Name of destination. */ | |
1097 | const char *dest_name; | |
1098 | }; | |
1099 | ||
1100 | /* Closes the target (for writing) if transfer has finished. */ | |
1101 | static void udt_close_if_finished(struct unidirectional_transfer *t) | |
1102 | { | |
1103 | if (STATE_NEEDS_CLOSING(t->state) && !t->bufuse) { | |
1104 | t->state = SSTATE_FINISHED; | |
1105 | if (t->dest_is_sock) | |
1106 | shutdown(t->dest, SHUT_WR); | |
1107 | else | |
1108 | close(t->dest); | |
1109 | transfer_debug("Closed %s.", t->dest_name); | |
1110 | } | |
1111 | } | |
1112 | ||
1113 | /* | |
1114 | * Tries to read read data from source into buffer. If buffer is full, | |
1115 | * no data is read. Returns 0 on success, -1 on error. | |
1116 | */ | |
1117 | static int udt_do_read(struct unidirectional_transfer *t) | |
1118 | { | |
1119 | ssize_t bytes; | |
1120 | ||
1121 | if (t->bufuse == BUFFERSIZE) | |
1122 | return 0; /* No space for more. */ | |
1123 | ||
1124 | transfer_debug("%s is readable", t->src_name); | |
1125 | bytes = read(t->src, t->buf + t->bufuse, BUFFERSIZE - t->bufuse); | |
1126 | if (bytes < 0 && errno != EWOULDBLOCK && errno != EAGAIN && | |
1127 | errno != EINTR) { | |
1128 | error("read(%s) failed: %s", t->src_name, strerror(errno)); | |
1129 | return -1; | |
1130 | } else if (bytes == 0) { | |
1131 | transfer_debug("%s EOF (with %i bytes in buffer)", | |
4621085b | 1132 | t->src_name, (int)t->bufuse); |
419f37db IL |
1133 | t->state = SSTATE_FLUSHING; |
1134 | } else if (bytes > 0) { | |
1135 | t->bufuse += bytes; | |
1136 | transfer_debug("Read %i bytes from %s (buffer now at %i)", | |
1137 | (int)bytes, t->src_name, (int)t->bufuse); | |
1138 | } | |
1139 | return 0; | |
1140 | } | |
1141 | ||
1142 | /* Tries to write data from buffer into destination. If buffer is empty, | |
1143 | * no data is written. Returns 0 on success, -1 on error. | |
1144 | */ | |
1145 | static int udt_do_write(struct unidirectional_transfer *t) | |
1146 | { | |
803dbdb9 | 1147 | ssize_t bytes; |
419f37db IL |
1148 | |
1149 | if (t->bufuse == 0) | |
1150 | return 0; /* Nothing to write. */ | |
1151 | ||
1152 | transfer_debug("%s is writable", t->dest_name); | |
7edc02f4 EFL |
1153 | bytes = xwrite(t->dest, t->buf, t->bufuse); |
1154 | if (bytes < 0 && errno != EWOULDBLOCK) { | |
419f37db IL |
1155 | error("write(%s) failed: %s", t->dest_name, strerror(errno)); |
1156 | return -1; | |
1157 | } else if (bytes > 0) { | |
1158 | t->bufuse -= bytes; | |
1159 | if (t->bufuse) | |
1160 | memmove(t->buf, t->buf + bytes, t->bufuse); | |
1161 | transfer_debug("Wrote %i bytes to %s (buffer now at %i)", | |
1162 | (int)bytes, t->dest_name, (int)t->bufuse); | |
1163 | } | |
1164 | return 0; | |
1165 | } | |
1166 | ||
1167 | ||
1168 | /* State of bidirectional transfer loop. */ | |
1169 | struct bidirectional_transfer_state { | |
1170 | /* Direction from program to git. */ | |
1171 | struct unidirectional_transfer ptg; | |
1172 | /* Direction from git to program. */ | |
1173 | struct unidirectional_transfer gtp; | |
1174 | }; | |
1175 | ||
1176 | static void *udt_copy_task_routine(void *udt) | |
1177 | { | |
1178 | struct unidirectional_transfer *t = (struct unidirectional_transfer *)udt; | |
1179 | while (t->state != SSTATE_FINISHED) { | |
1180 | if (STATE_NEEDS_READING(t->state)) | |
1181 | if (udt_do_read(t)) | |
1182 | return NULL; | |
1183 | if (STATE_NEEDS_WRITING(t->state)) | |
1184 | if (udt_do_write(t)) | |
1185 | return NULL; | |
1186 | if (STATE_NEEDS_CLOSING(t->state)) | |
1187 | udt_close_if_finished(t); | |
1188 | } | |
1189 | return udt; /* Just some non-NULL value. */ | |
1190 | } | |
1191 | ||
1192 | #ifndef NO_PTHREADS | |
1193 | ||
1194 | /* | |
98e023de | 1195 | * Join thread, with appropriate errors on failure. Name is name for the |
419f37db IL |
1196 | * thread (for error messages). Returns 0 on success, 1 on failure. |
1197 | */ | |
1198 | static int tloop_join(pthread_t thread, const char *name) | |
1199 | { | |
1200 | int err; | |
1201 | void *tret; | |
1202 | err = pthread_join(thread, &tret); | |
1203 | if (!tret) { | |
1204 | error("%s thread failed", name); | |
1205 | return 1; | |
1206 | } | |
1207 | if (err) { | |
1208 | error("%s thread failed to join: %s", name, strerror(err)); | |
1209 | return 1; | |
1210 | } | |
1211 | return 0; | |
1212 | } | |
1213 | ||
1214 | /* | |
1215 | * Spawn the transfer tasks and then wait for them. Returns 0 on success, | |
1216 | * -1 on failure. | |
1217 | */ | |
1218 | static int tloop_spawnwait_tasks(struct bidirectional_transfer_state *s) | |
1219 | { | |
1220 | pthread_t gtp_thread; | |
1221 | pthread_t ptg_thread; | |
1222 | int err; | |
1223 | int ret = 0; | |
1224 | err = pthread_create(>p_thread, NULL, udt_copy_task_routine, | |
1225 | &s->gtp); | |
1226 | if (err) | |
1227 | die("Can't start thread for copying data: %s", strerror(err)); | |
1228 | err = pthread_create(&ptg_thread, NULL, udt_copy_task_routine, | |
1229 | &s->ptg); | |
1230 | if (err) | |
1231 | die("Can't start thread for copying data: %s", strerror(err)); | |
1232 | ||
1233 | ret |= tloop_join(gtp_thread, "Git to program copy"); | |
1234 | ret |= tloop_join(ptg_thread, "Program to git copy"); | |
1235 | return ret; | |
1236 | } | |
1237 | #else | |
1238 | ||
1239 | /* Close the source and target (for writing) for transfer. */ | |
1240 | static void udt_kill_transfer(struct unidirectional_transfer *t) | |
1241 | { | |
1242 | t->state = SSTATE_FINISHED; | |
1243 | /* | |
1244 | * Socket read end left open isn't a disaster if nobody | |
1245 | * attempts to read from it (mingw compat headers do not | |
1246 | * have SHUT_RD)... | |
1247 | * | |
1248 | * We can't fully close the socket since otherwise gtp | |
1249 | * task would first close the socket it sends data to | |
1250 | * while closing the ptg file descriptors. | |
1251 | */ | |
1252 | if (!t->src_is_sock) | |
1253 | close(t->src); | |
1254 | if (t->dest_is_sock) | |
1255 | shutdown(t->dest, SHUT_WR); | |
1256 | else | |
1257 | close(t->dest); | |
1258 | } | |
1259 | ||
1260 | /* | |
98e023de | 1261 | * Join process, with appropriate errors on failure. Name is name for the |
419f37db IL |
1262 | * process (for error messages). Returns 0 on success, 1 on failure. |
1263 | */ | |
1264 | static int tloop_join(pid_t pid, const char *name) | |
1265 | { | |
1266 | int tret; | |
1267 | if (waitpid(pid, &tret, 0) < 0) { | |
1268 | error("%s process failed to wait: %s", name, strerror(errno)); | |
1269 | return 1; | |
1270 | } | |
1271 | if (!WIFEXITED(tret) || WEXITSTATUS(tret)) { | |
1272 | error("%s process failed", name); | |
1273 | return 1; | |
1274 | } | |
1275 | return 0; | |
1276 | } | |
1277 | ||
1278 | /* | |
1279 | * Spawn the transfer tasks and then wait for them. Returns 0 on success, | |
1280 | * -1 on failure. | |
1281 | */ | |
1282 | static int tloop_spawnwait_tasks(struct bidirectional_transfer_state *s) | |
1283 | { | |
1284 | pid_t pid1, pid2; | |
1285 | int ret = 0; | |
1286 | ||
1287 | /* Fork thread #1: git to program. */ | |
1288 | pid1 = fork(); | |
1289 | if (pid1 < 0) | |
1290 | die_errno("Can't start thread for copying data"); | |
1291 | else if (pid1 == 0) { | |
1292 | udt_kill_transfer(&s->ptg); | |
1293 | exit(udt_copy_task_routine(&s->gtp) ? 0 : 1); | |
1294 | } | |
1295 | ||
1296 | /* Fork thread #2: program to git. */ | |
1297 | pid2 = fork(); | |
1298 | if (pid2 < 0) | |
1299 | die_errno("Can't start thread for copying data"); | |
1300 | else if (pid2 == 0) { | |
1301 | udt_kill_transfer(&s->gtp); | |
1302 | exit(udt_copy_task_routine(&s->ptg) ? 0 : 1); | |
1303 | } | |
1304 | ||
1305 | /* | |
1306 | * Close both streams in parent as to not interfere with | |
1307 | * end of file detection and wait for both tasks to finish. | |
1308 | */ | |
1309 | udt_kill_transfer(&s->gtp); | |
1310 | udt_kill_transfer(&s->ptg); | |
1311 | ret |= tloop_join(pid1, "Git to program copy"); | |
1312 | ret |= tloop_join(pid2, "Program to git copy"); | |
1313 | return ret; | |
1314 | } | |
1315 | #endif | |
1316 | ||
1317 | /* | |
1318 | * Copies data from stdin to output and from input to stdout simultaneously. | |
1319 | * Additionally filtering through given filter. If filter is NULL, uses | |
1320 | * identity filter. | |
1321 | */ | |
1322 | int bidirectional_transfer_loop(int input, int output) | |
1323 | { | |
1324 | struct bidirectional_transfer_state state; | |
1325 | ||
1326 | /* Fill the state fields. */ | |
1327 | state.ptg.src = input; | |
1328 | state.ptg.dest = 1; | |
1329 | state.ptg.src_is_sock = (input == output); | |
1330 | state.ptg.dest_is_sock = 0; | |
1331 | state.ptg.state = SSTATE_TRANSFERING; | |
1332 | state.ptg.bufuse = 0; | |
1333 | state.ptg.src_name = "remote input"; | |
1334 | state.ptg.dest_name = "stdout"; | |
1335 | ||
1336 | state.gtp.src = 0; | |
1337 | state.gtp.dest = output; | |
1338 | state.gtp.src_is_sock = 0; | |
1339 | state.gtp.dest_is_sock = (input == output); | |
1340 | state.gtp.state = SSTATE_TRANSFERING; | |
1341 | state.gtp.bufuse = 0; | |
1342 | state.gtp.src_name = "stdin"; | |
1343 | state.gtp.dest_name = "remote output"; | |
1344 | ||
1345 | return tloop_spawnwait_tasks(&state); | |
1346 | } |