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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"); | |
266f1fdf | 61 | exit(128); |
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; | |
bfc366d9 | 104 | struct argv_array argv = ARGV_ARRAY_INIT; |
6eb996b5 DB |
105 | struct strbuf buf = STRBUF_INIT; |
106 | struct child_process *helper; | |
72ff8943 DB |
107 | const char **refspecs = NULL; |
108 | int refspec_nr = 0; | |
109 | int refspec_alloc = 0; | |
61b075bd | 110 | int duped; |
6b02de3b | 111 | int code; |
e1735872 DI |
112 | char git_dir_buf[sizeof(GIT_DIR_ENVIRONMENT) + PATH_MAX + 1]; |
113 | const char *helper_env[] = { | |
114 | git_dir_buf, | |
115 | NULL | |
116 | }; | |
117 | ||
6eb996b5 DB |
118 | |
119 | if (data->helper) | |
120 | return data->helper; | |
121 | ||
122 | helper = xcalloc(1, sizeof(*helper)); | |
123 | helper->in = -1; | |
124 | helper->out = -1; | |
125 | helper->err = 0; | |
bfc366d9 FA |
126 | argv_array_pushf(&argv, "git-remote-%s", data->name); |
127 | argv_array_push(&argv, transport->remote->name); | |
128 | argv_array_push(&argv, remove_ext_force(transport->url)); | |
129 | helper->argv = argv_array_detach(&argv, NULL); | |
6b02de3b IL |
130 | helper->git_cmd = 0; |
131 | helper->silent_exec_failure = 1; | |
e1735872 DI |
132 | |
133 | snprintf(git_dir_buf, sizeof(git_dir_buf), "%s=%s", GIT_DIR_ENVIRONMENT, get_git_dir()); | |
134 | helper->env = helper_env; | |
135 | ||
6b02de3b IL |
136 | code = start_command(helper); |
137 | if (code < 0 && errno == ENOENT) | |
138 | die("Unable to find remote helper for '%s'", data->name); | |
139 | else if (code != 0) | |
140 | exit(code); | |
141 | ||
6eb996b5 | 142 | data->helper = helper; |
fa8c097c | 143 | data->no_disconnect_req = 0; |
6eb996b5 | 144 | |
61b075bd IL |
145 | /* |
146 | * Open the output as FILE* so strbuf_getline() can be used. | |
147 | * Do this with duped fd because fclose() will close the fd, | |
148 | * and stuff like taking over will require the fd to remain. | |
61b075bd IL |
149 | */ |
150 | duped = dup(helper->out); | |
151 | if (duped < 0) | |
152 | die_errno("Can't dup helper output fd"); | |
153 | data->out = xfdopen(duped, "r"); | |
154 | ||
bf3c523c | 155 | write_constant(helper->in, "capabilities\n"); |
2d14d65c | 156 | |
6eb996b5 | 157 | while (1) { |
28ed5b35 IL |
158 | const char *capname; |
159 | int mandatory = 0; | |
bf3c523c | 160 | recvline(data, &buf); |
6eb996b5 DB |
161 | |
162 | if (!*buf.buf) | |
163 | break; | |
28ed5b35 IL |
164 | |
165 | if (*buf.buf == '*') { | |
166 | capname = buf.buf + 1; | |
167 | mandatory = 1; | |
168 | } else | |
169 | capname = buf.buf; | |
170 | ||
bf3c523c | 171 | if (debug) |
28ed5b35 IL |
172 | fprintf(stderr, "Debug: Got cap %s\n", capname); |
173 | if (!strcmp(capname, "fetch")) | |
6eb996b5 | 174 | data->fetch = 1; |
28ed5b35 | 175 | else if (!strcmp(capname, "option")) |
ef08ef9e | 176 | data->option = 1; |
28ed5b35 | 177 | else if (!strcmp(capname, "push")) |
ae4efe19 | 178 | data->push = 1; |
28ed5b35 | 179 | else if (!strcmp(capname, "import")) |
e65e91ed | 180 | data->import = 1; |
bfc366d9 FA |
181 | else if (!strcmp(capname, "bidi-import")) |
182 | data->bidi_import = 1; | |
73b49a75 SR |
183 | else if (!strcmp(capname, "export")) |
184 | data->export = 1; | |
9ba38048 NTND |
185 | else if (!strcmp(capname, "check-connectivity")) |
186 | data->check_connectivity = 1; | |
59556548 | 187 | else if (!data->refspecs && starts_with(capname, "refspec ")) { |
72ff8943 DB |
188 | ALLOC_GROW(refspecs, |
189 | refspec_nr + 1, | |
190 | refspec_alloc); | |
c28cce55 | 191 | refspecs[refspec_nr++] = xstrdup(capname + strlen("refspec ")); |
fa8c097c IL |
192 | } else if (!strcmp(capname, "connect")) { |
193 | data->connect = 1; | |
0d957a4d JK |
194 | } else if (!strcmp(capname, "signed-tags")) { |
195 | data->signed_tags = 1; | |
59556548 | 196 | } else if (starts_with(capname, "export-marks ")) { |
a515ebe9 SR |
197 | struct strbuf arg = STRBUF_INIT; |
198 | strbuf_addstr(&arg, "--export-marks="); | |
199 | strbuf_addstr(&arg, capname + strlen("export-marks ")); | |
200 | data->export_marks = strbuf_detach(&arg, NULL); | |
59556548 | 201 | } else if (starts_with(capname, "import-marks")) { |
a515ebe9 SR |
202 | struct strbuf arg = STRBUF_INIT; |
203 | strbuf_addstr(&arg, "--import-marks="); | |
204 | strbuf_addstr(&arg, capname + strlen("import-marks ")); | |
205 | data->import_marks = strbuf_detach(&arg, NULL); | |
59556548 | 206 | } else if (starts_with(capname, "no-private-update")) { |
597b831a | 207 | data->no_private_update = 1; |
28ed5b35 | 208 | } else if (mandatory) { |
9517e6b8 | 209 | die("Unknown mandatory capability %s. This remote " |
82247e9b | 210 | "helper probably needs newer version of Git.", |
28ed5b35 | 211 | capname); |
72ff8943 DB |
212 | } |
213 | } | |
214 | if (refspecs) { | |
215 | int i; | |
216 | data->refspec_nr = refspec_nr; | |
217 | data->refspecs = parse_fetch_refspec(refspec_nr, refspecs); | |
b120ef3e | 218 | for (i = 0; i < refspec_nr; i++) |
72ff8943 | 219 | free((char *)refspecs[i]); |
72ff8943 | 220 | free(refspecs); |
a93b4a09 FC |
221 | } else if (data->import || data->bidi_import || data->export) { |
222 | warning("This remote helper should implement refspec capability."); | |
6eb996b5 | 223 | } |
b962dbdc | 224 | strbuf_release(&buf); |
bf3c523c IL |
225 | if (debug) |
226 | fprintf(stderr, "Debug: Capabilities complete.\n"); | |
6eb996b5 DB |
227 | return data->helper; |
228 | } | |
229 | ||
230 | static int disconnect_helper(struct transport *transport) | |
231 | { | |
232 | struct helper_data *data = transport->data; | |
cc567322 | 233 | int res = 0; |
bf3c523c | 234 | |
6eb996b5 | 235 | if (data->helper) { |
bf3c523c IL |
236 | if (debug) |
237 | fprintf(stderr, "Debug: Disconnecting.\n"); | |
fa8c097c | 238 | if (!data->no_disconnect_req) { |
c34fe630 JK |
239 | /* |
240 | * Ignore write errors; there's nothing we can do, | |
241 | * since we're about to close the pipe anyway. And the | |
242 | * most likely error is EPIPE due to the helper dying | |
243 | * to report an error itself. | |
244 | */ | |
245 | sigchain_push(SIGPIPE, SIG_IGN); | |
246 | xwrite(data->helper->in, "\n", 1); | |
247 | sigchain_pop(SIGPIPE); | |
fa8c097c | 248 | } |
6eb996b5 | 249 | close(data->helper->in); |
61b075bd | 250 | close(data->helper->out); |
292ce46b | 251 | fclose(data->out); |
cc567322 | 252 | res = finish_command(data->helper); |
bfc366d9 | 253 | argv_array_free_detached(data->helper->argv); |
6eb996b5 DB |
254 | free(data->helper); |
255 | data->helper = NULL; | |
256 | } | |
cc567322 | 257 | return res; |
6eb996b5 DB |
258 | } |
259 | ||
ef08ef9e SP |
260 | static const char *unsupported_options[] = { |
261 | TRANS_OPT_UPLOADPACK, | |
262 | TRANS_OPT_RECEIVEPACK, | |
263 | TRANS_OPT_THIN, | |
264 | TRANS_OPT_KEEP | |
265 | }; | |
23cd01ec | 266 | |
ef08ef9e SP |
267 | static const char *boolean_options[] = { |
268 | TRANS_OPT_THIN, | |
269 | TRANS_OPT_KEEP, | |
270 | TRANS_OPT_FOLLOWTAGS | |
271 | }; | |
272 | ||
273 | static int set_helper_option(struct transport *transport, | |
274 | const char *name, const char *value) | |
275 | { | |
276 | struct helper_data *data = transport->data; | |
ef08ef9e SP |
277 | struct strbuf buf = STRBUF_INIT; |
278 | int i, ret, is_bool = 0; | |
279 | ||
bf3c523c IL |
280 | get_helper(transport); |
281 | ||
ef08ef9e SP |
282 | if (!data->option) |
283 | return 1; | |
284 | ||
285 | for (i = 0; i < ARRAY_SIZE(unsupported_options); i++) { | |
286 | if (!strcmp(name, unsupported_options[i])) | |
287 | return 1; | |
288 | } | |
289 | ||
290 | for (i = 0; i < ARRAY_SIZE(boolean_options); i++) { | |
291 | if (!strcmp(name, boolean_options[i])) { | |
292 | is_bool = 1; | |
293 | break; | |
294 | } | |
295 | } | |
296 | ||
297 | strbuf_addf(&buf, "option %s ", name); | |
298 | if (is_bool) | |
299 | strbuf_addstr(&buf, value ? "true" : "false"); | |
300 | else | |
301 | quote_c_style(value, &buf, NULL, 0); | |
302 | strbuf_addch(&buf, '\n'); | |
303 | ||
4a1b59c8 FC |
304 | sendline(data, &buf); |
305 | recvline(data, &buf); | |
ef08ef9e SP |
306 | |
307 | if (!strcmp(buf.buf, "ok")) | |
308 | ret = 0; | |
59556548 | 309 | else if (starts_with(buf.buf, "error")) { |
ef08ef9e SP |
310 | ret = -1; |
311 | } else if (!strcmp(buf.buf, "unsupported")) | |
312 | ret = 1; | |
313 | else { | |
314 | warning("%s unexpectedly said: '%s'", data->name, buf.buf); | |
315 | ret = 1; | |
316 | } | |
317 | strbuf_release(&buf); | |
318 | return ret; | |
319 | } | |
320 | ||
321 | static void standard_options(struct transport *t) | |
322 | { | |
323 | char buf[16]; | |
324 | int n; | |
325 | int v = t->verbose; | |
ef08ef9e | 326 | |
d01b3c02 | 327 | set_helper_option(t, "progress", t->progress ? "true" : "false"); |
ef08ef9e SP |
328 | |
329 | n = snprintf(buf, sizeof(buf), "%d", v + 1); | |
330 | if (n >= sizeof(buf)) | |
331 | die("impossibly large verbosity value"); | |
332 | set_helper_option(t, "verbosity", buf); | |
333 | } | |
334 | ||
f2a37151 DB |
335 | static int release_helper(struct transport *transport) |
336 | { | |
cc567322 | 337 | int res = 0; |
72ff8943 DB |
338 | struct helper_data *data = transport->data; |
339 | free_refspec(data->refspec_nr, data->refspecs); | |
340 | data->refspecs = NULL; | |
cc567322 | 341 | res = disconnect_helper(transport); |
f2a37151 | 342 | free(transport->data); |
cc567322 | 343 | return res; |
f2a37151 DB |
344 | } |
345 | ||
6eb996b5 | 346 | static int fetch_with_fetch(struct transport *transport, |
37148311 | 347 | int nr_heads, struct ref **to_fetch) |
6eb996b5 | 348 | { |
292ce46b | 349 | struct helper_data *data = transport->data; |
6eb996b5 DB |
350 | int i; |
351 | struct strbuf buf = STRBUF_INIT; | |
352 | ||
ef08ef9e | 353 | standard_options(transport); |
9ba38048 NTND |
354 | if (data->check_connectivity && |
355 | data->transport_options.check_self_contained_and_connected) | |
356 | set_helper_option(transport, "check-connectivity", "true"); | |
ef08ef9e | 357 | |
16094885 NTND |
358 | if (transport->cloning) |
359 | set_helper_option(transport, "cloning", "true"); | |
360 | ||
361 | if (data->transport_options.update_shallow) | |
362 | set_helper_option(transport, "update-shallow", "true"); | |
363 | ||
6eb996b5 | 364 | for (i = 0; i < nr_heads; i++) { |
1088261f | 365 | const struct ref *posn = to_fetch[i]; |
6eb996b5 DB |
366 | if (posn->status & REF_STATUS_UPTODATE) |
367 | continue; | |
2d14d65c DB |
368 | |
369 | strbuf_addf(&buf, "fetch %s %s\n", | |
370 | sha1_to_hex(posn->old_sha1), posn->name); | |
292ce46b | 371 | } |
2d14d65c | 372 | |
292ce46b | 373 | strbuf_addch(&buf, '\n'); |
bf3c523c | 374 | sendline(data, &buf); |
292ce46b SP |
375 | |
376 | while (1) { | |
bf3c523c | 377 | recvline(data, &buf); |
292ce46b | 378 | |
59556548 | 379 | if (starts_with(buf.buf, "lock ")) { |
292ce46b SP |
380 | const char *name = buf.buf + 5; |
381 | if (transport->pack_lockfile) | |
382 | warning("%s also locked %s", data->name, name); | |
383 | else | |
384 | transport->pack_lockfile = xstrdup(name); | |
385 | } | |
9ba38048 NTND |
386 | else if (data->check_connectivity && |
387 | data->transport_options.check_self_contained_and_connected && | |
388 | !strcmp(buf.buf, "connectivity-ok")) | |
389 | data->transport_options.self_contained_and_connected = 1; | |
292ce46b SP |
390 | else if (!buf.len) |
391 | break; | |
392 | else | |
393 | warning("%s unexpectedly said: '%s'", data->name, buf.buf); | |
6eb996b5 | 394 | } |
292ce46b | 395 | strbuf_release(&buf); |
6eb996b5 DB |
396 | return 0; |
397 | } | |
398 | ||
e65e91ed DB |
399 | static int get_importer(struct transport *transport, struct child_process *fastimport) |
400 | { | |
401 | struct child_process *helper = get_helper(transport); | |
bfc366d9 FA |
402 | struct helper_data *data = transport->data; |
403 | struct argv_array argv = ARGV_ARRAY_INIT; | |
404 | int cat_blob_fd, code; | |
e65e91ed DB |
405 | memset(fastimport, 0, sizeof(*fastimport)); |
406 | fastimport->in = helper->out; | |
bfc366d9 | 407 | argv_array_push(&argv, "fast-import"); |
19ba02af | 408 | argv_array_push(&argv, debug ? "--stats" : "--quiet"); |
e65e91ed | 409 | |
bfc366d9 FA |
410 | if (data->bidi_import) { |
411 | cat_blob_fd = xdup(helper->in); | |
412 | argv_array_pushf(&argv, "--cat-blob-fd=%d", cat_blob_fd); | |
413 | } | |
414 | fastimport->argv = argv.argv; | |
e65e91ed | 415 | fastimport->git_cmd = 1; |
bfc366d9 FA |
416 | |
417 | code = start_command(fastimport); | |
418 | return code; | |
e65e91ed DB |
419 | } |
420 | ||
73b49a75 SR |
421 | static int get_exporter(struct transport *transport, |
422 | struct child_process *fastexport, | |
73b49a75 SR |
423 | struct string_list *revlist_args) |
424 | { | |
a515ebe9 | 425 | struct helper_data *data = transport->data; |
73b49a75 SR |
426 | struct child_process *helper = get_helper(transport); |
427 | int argc = 0, i; | |
428 | memset(fastexport, 0, sizeof(*fastexport)); | |
429 | ||
430 | /* we need to duplicate helper->in because we want to use it after | |
431 | * fastexport is done with it. */ | |
432 | fastexport->out = dup(helper->in); | |
b8bd826f | 433 | fastexport->argv = xcalloc(6 + revlist_args->nr, sizeof(*fastexport->argv)); |
73b49a75 | 434 | fastexport->argv[argc++] = "fast-export"; |
1f25c504 | 435 | fastexport->argv[argc++] = "--use-done-feature"; |
0d957a4d JK |
436 | fastexport->argv[argc++] = data->signed_tags ? |
437 | "--signed-tags=verbatim" : "--signed-tags=warn-strip"; | |
a515ebe9 SR |
438 | if (data->export_marks) |
439 | fastexport->argv[argc++] = data->export_marks; | |
440 | if (data->import_marks) | |
441 | fastexport->argv[argc++] = data->import_marks; | |
73b49a75 SR |
442 | |
443 | for (i = 0; i < revlist_args->nr; i++) | |
444 | fastexport->argv[argc++] = revlist_args->items[i].string; | |
445 | ||
446 | fastexport->git_cmd = 1; | |
447 | return start_command(fastexport); | |
448 | } | |
449 | ||
e65e91ed DB |
450 | static int fetch_with_import(struct transport *transport, |
451 | int nr_heads, struct ref **to_fetch) | |
452 | { | |
453 | struct child_process fastimport; | |
72ff8943 | 454 | struct helper_data *data = transport->data; |
e65e91ed DB |
455 | int i; |
456 | struct ref *posn; | |
457 | struct strbuf buf = STRBUF_INIT; | |
458 | ||
bf3c523c IL |
459 | get_helper(transport); |
460 | ||
e65e91ed DB |
461 | if (get_importer(transport, &fastimport)) |
462 | die("Couldn't run fast-import"); | |
463 | ||
464 | for (i = 0; i < nr_heads; i++) { | |
465 | posn = to_fetch[i]; | |
466 | if (posn->status & REF_STATUS_UPTODATE) | |
467 | continue; | |
468 | ||
469 | strbuf_addf(&buf, "import %s\n", posn->name); | |
bf3c523c | 470 | sendline(data, &buf); |
e65e91ed DB |
471 | strbuf_reset(&buf); |
472 | } | |
9504bc9d SR |
473 | |
474 | write_constant(data->helper->in, "\n"); | |
bfc366d9 FA |
475 | /* |
476 | * remote-helpers that advertise the bidi-import capability are required to | |
477 | * buffer the complete batch of import commands until this newline before | |
478 | * sending data to fast-import. | |
479 | * These helpers read back data from fast-import on their stdin, which could | |
480 | * be mixed with import commands, otherwise. | |
481 | */ | |
9504bc9d | 482 | |
cc567322 SR |
483 | if (finish_command(&fastimport)) |
484 | die("Error while running fast-import"); | |
bfc366d9 | 485 | argv_array_free_detached(fastimport.argv); |
e65e91ed | 486 | |
dff9d65d FA |
487 | /* |
488 | * The fast-import stream of a remote helper that advertises | |
489 | * the "refspec" capability writes to the refs named after the | |
490 | * right hand side of the first refspec matching each ref we | |
491 | * were fetching. | |
492 | * | |
493 | * (If no "refspec" capability was specified, for historical | |
7a43c554 | 494 | * reasons we default to the equivalent of *:*.) |
dff9d65d FA |
495 | * |
496 | * Store the result in to_fetch[i].old_sha1. Callers such | |
497 | * as "git fetch" can use the value to write feedback to the | |
498 | * terminal, populate FETCH_HEAD, and determine what new value | |
499 | * should be written to peer_ref if the update is a | |
500 | * fast-forward or this is a forced update. | |
501 | */ | |
e65e91ed | 502 | for (i = 0; i < nr_heads; i++) { |
72ff8943 | 503 | char *private; |
e65e91ed DB |
504 | posn = to_fetch[i]; |
505 | if (posn->status & REF_STATUS_UPTODATE) | |
506 | continue; | |
72ff8943 DB |
507 | if (data->refspecs) |
508 | private = apply_refspecs(data->refspecs, data->refspec_nr, posn->name); | |
509 | else | |
c28cce55 | 510 | private = xstrdup(posn->name); |
d51b720f MH |
511 | if (private) { |
512 | read_ref(private, posn->old_sha1); | |
513 | free(private); | |
514 | } | |
e65e91ed | 515 | } |
b962dbdc | 516 | strbuf_release(&buf); |
e65e91ed DB |
517 | return 0; |
518 | } | |
519 | ||
fa8c097c IL |
520 | static int process_connect_service(struct transport *transport, |
521 | const char *name, const char *exec) | |
522 | { | |
523 | struct helper_data *data = transport->data; | |
524 | struct strbuf cmdbuf = STRBUF_INIT; | |
525 | struct child_process *helper; | |
526 | int r, duped, ret = 0; | |
527 | FILE *input; | |
528 | ||
529 | helper = get_helper(transport); | |
530 | ||
531 | /* | |
532 | * Yes, dup the pipe another time, as we need unbuffered version | |
533 | * of input pipe as FILE*. fclose() closes the underlying fd and | |
534 | * stream buffering only can be changed before first I/O operation | |
535 | * on it. | |
536 | */ | |
537 | duped = dup(helper->out); | |
538 | if (duped < 0) | |
539 | die_errno("Can't dup helper output fd"); | |
540 | input = xfdopen(duped, "r"); | |
541 | setvbuf(input, NULL, _IONBF, 0); | |
542 | ||
543 | /* | |
544 | * Handle --upload-pack and friends. This is fire and forget... | |
545 | * just warn if it fails. | |
546 | */ | |
547 | if (strcmp(name, exec)) { | |
548 | r = set_helper_option(transport, "servpath", exec); | |
549 | if (r > 0) | |
550 | warning("Setting remote service path not supported by protocol."); | |
551 | else if (r < 0) | |
552 | warning("Invalid remote service path."); | |
553 | } | |
554 | ||
555 | if (data->connect) | |
556 | strbuf_addf(&cmdbuf, "connect %s\n", name); | |
557 | else | |
558 | goto exit; | |
559 | ||
560 | sendline(data, &cmdbuf); | |
c096955c | 561 | recvline_fh(input, &cmdbuf, name); |
fa8c097c IL |
562 | if (!strcmp(cmdbuf.buf, "")) { |
563 | data->no_disconnect_req = 1; | |
564 | if (debug) | |
565 | fprintf(stderr, "Debug: Smart transport connection " | |
566 | "ready.\n"); | |
567 | ret = 1; | |
568 | } else if (!strcmp(cmdbuf.buf, "fallback")) { | |
569 | if (debug) | |
570 | fprintf(stderr, "Debug: Falling back to dumb " | |
571 | "transport.\n"); | |
572 | } else | |
573 | die("Unknown response to connect: %s", | |
574 | cmdbuf.buf); | |
575 | ||
576 | exit: | |
577 | fclose(input); | |
578 | return ret; | |
579 | } | |
580 | ||
581 | static int process_connect(struct transport *transport, | |
582 | int for_push) | |
583 | { | |
584 | struct helper_data *data = transport->data; | |
585 | const char *name; | |
586 | const char *exec; | |
587 | ||
588 | name = for_push ? "git-receive-pack" : "git-upload-pack"; | |
589 | if (for_push) | |
590 | exec = data->transport_options.receivepack; | |
591 | else | |
592 | exec = data->transport_options.uploadpack; | |
593 | ||
594 | return process_connect_service(transport, name, exec); | |
595 | } | |
596 | ||
b236752a IL |
597 | static int connect_helper(struct transport *transport, const char *name, |
598 | const char *exec, int fd[2]) | |
599 | { | |
600 | struct helper_data *data = transport->data; | |
601 | ||
602 | /* Get_helper so connect is inited. */ | |
603 | get_helper(transport); | |
604 | if (!data->connect) | |
605 | die("Operation not supported by protocol."); | |
606 | ||
607 | if (!process_connect_service(transport, name, exec)) | |
608 | die("Can't connect to subservice %s.", name); | |
609 | ||
610 | fd[0] = data->helper->out; | |
611 | fd[1] = data->helper->in; | |
612 | return 0; | |
613 | } | |
614 | ||
6eb996b5 | 615 | static int fetch(struct transport *transport, |
37148311 | 616 | int nr_heads, struct ref **to_fetch) |
6eb996b5 DB |
617 | { |
618 | struct helper_data *data = transport->data; | |
619 | int i, count; | |
620 | ||
fa8c097c IL |
621 | if (process_connect(transport, 0)) { |
622 | do_take_over(transport); | |
623 | return transport->fetch(transport, nr_heads, to_fetch); | |
624 | } | |
625 | ||
6eb996b5 DB |
626 | count = 0; |
627 | for (i = 0; i < nr_heads; i++) | |
628 | if (!(to_fetch[i]->status & REF_STATUS_UPTODATE)) | |
629 | count++; | |
630 | ||
631 | if (!count) | |
632 | return 0; | |
633 | ||
634 | if (data->fetch) | |
635 | return fetch_with_fetch(transport, nr_heads, to_fetch); | |
636 | ||
e65e91ed DB |
637 | if (data->import) |
638 | return fetch_with_import(transport, nr_heads, to_fetch); | |
639 | ||
6eb996b5 DB |
640 | return -1; |
641 | } | |
642 | ||
664059fb | 643 | static int push_update_ref_status(struct strbuf *buf, |
d2e73c6f SR |
644 | struct ref **ref, |
645 | struct ref *remote_refs) | |
646 | { | |
647 | char *refname, *msg; | |
f9e3c6be | 648 | int status, forced = 0; |
d2e73c6f | 649 | |
59556548 | 650 | if (starts_with(buf->buf, "ok ")) { |
d2e73c6f SR |
651 | status = REF_STATUS_OK; |
652 | refname = buf->buf + 3; | |
59556548 | 653 | } else if (starts_with(buf->buf, "error ")) { |
d2e73c6f SR |
654 | status = REF_STATUS_REMOTE_REJECT; |
655 | refname = buf->buf + 6; | |
656 | } else | |
82247e9b | 657 | die("expected ok/error, helper said '%s'", buf->buf); |
d2e73c6f SR |
658 | |
659 | msg = strchr(refname, ' '); | |
660 | if (msg) { | |
661 | struct strbuf msg_buf = STRBUF_INIT; | |
662 | const char *end; | |
663 | ||
664 | *msg++ = '\0'; | |
665 | if (!unquote_c_style(&msg_buf, msg, &end)) | |
666 | msg = strbuf_detach(&msg_buf, NULL); | |
667 | else | |
668 | msg = xstrdup(msg); | |
669 | strbuf_release(&msg_buf); | |
670 | ||
671 | if (!strcmp(msg, "no match")) { | |
672 | status = REF_STATUS_NONE; | |
673 | free(msg); | |
674 | msg = NULL; | |
675 | } | |
676 | else if (!strcmp(msg, "up to date")) { | |
677 | status = REF_STATUS_UPTODATE; | |
678 | free(msg); | |
679 | msg = NULL; | |
680 | } | |
681 | else if (!strcmp(msg, "non-fast forward")) { | |
682 | status = REF_STATUS_REJECT_NONFASTFORWARD; | |
683 | free(msg); | |
684 | msg = NULL; | |
685 | } | |
dbfeddb1 CR |
686 | else if (!strcmp(msg, "already exists")) { |
687 | status = REF_STATUS_REJECT_ALREADY_EXISTS; | |
688 | free(msg); | |
689 | msg = NULL; | |
690 | } | |
75e5c0dc JH |
691 | else if (!strcmp(msg, "fetch first")) { |
692 | status = REF_STATUS_REJECT_FETCH_FIRST; | |
693 | free(msg); | |
694 | msg = NULL; | |
695 | } | |
696 | else if (!strcmp(msg, "needs force")) { | |
697 | status = REF_STATUS_REJECT_NEEDS_FORCE; | |
698 | free(msg); | |
699 | msg = NULL; | |
700 | } | |
631b5ef2 JH |
701 | else if (!strcmp(msg, "stale info")) { |
702 | status = REF_STATUS_REJECT_STALE; | |
703 | free(msg); | |
704 | msg = NULL; | |
705 | } | |
f9e3c6be FC |
706 | else if (!strcmp(msg, "forced update")) { |
707 | forced = 1; | |
708 | free(msg); | |
709 | msg = NULL; | |
710 | } | |
d2e73c6f SR |
711 | } |
712 | ||
713 | if (*ref) | |
714 | *ref = find_ref_by_name(*ref, refname); | |
715 | if (!*ref) | |
716 | *ref = find_ref_by_name(remote_refs, refname); | |
717 | if (!*ref) { | |
718 | warning("helper reported unexpected status of %s", refname); | |
664059fb | 719 | return 1; |
d2e73c6f SR |
720 | } |
721 | ||
722 | if ((*ref)->status != REF_STATUS_NONE) { | |
723 | /* | |
724 | * Earlier, the ref was marked not to be pushed, so ignore the ref | |
725 | * status reported by the remote helper if the latter is 'no match'. | |
726 | */ | |
727 | if (status == REF_STATUS_NONE) | |
664059fb | 728 | return 1; |
d2e73c6f SR |
729 | } |
730 | ||
731 | (*ref)->status = status; | |
cf31f70c | 732 | (*ref)->forced_update |= forced; |
d2e73c6f | 733 | (*ref)->remote_status = msg; |
126aac5c | 734 | return !(status == REF_STATUS_OK); |
d2e73c6f SR |
735 | } |
736 | ||
737 | static void push_update_refs_status(struct helper_data *data, | |
5a75353f FC |
738 | struct ref *remote_refs, |
739 | int flags) | |
d2e73c6f SR |
740 | { |
741 | struct strbuf buf = STRBUF_INIT; | |
742 | struct ref *ref = remote_refs; | |
743 | for (;;) { | |
664059fb FC |
744 | char *private; |
745 | ||
d2e73c6f SR |
746 | recvline(data, &buf); |
747 | if (!buf.len) | |
748 | break; | |
749 | ||
664059fb FC |
750 | if (push_update_ref_status(&buf, &ref, remote_refs)) |
751 | continue; | |
752 | ||
5a75353f | 753 | if (flags & TRANSPORT_PUSH_DRY_RUN || !data->refspecs || data->no_private_update) |
664059fb FC |
754 | continue; |
755 | ||
756 | /* propagate back the update to the remote namespace */ | |
757 | private = apply_refspecs(data->refspecs, data->refspec_nr, ref->name); | |
758 | if (!private) | |
759 | continue; | |
760 | update_ref("update by helper", private, ref->new_sha1, NULL, 0, 0); | |
761 | free(private); | |
d2e73c6f SR |
762 | } |
763 | strbuf_release(&buf); | |
764 | } | |
765 | ||
73b49a75 | 766 | static int push_refs_with_push(struct transport *transport, |
05c1eb10 | 767 | struct ref *remote_refs, int flags) |
ae4efe19 SP |
768 | { |
769 | int force_all = flags & TRANSPORT_PUSH_FORCE; | |
770 | int mirror = flags & TRANSPORT_PUSH_MIRROR; | |
771 | struct helper_data *data = transport->data; | |
772 | struct strbuf buf = STRBUF_INIT; | |
ae4efe19 | 773 | struct ref *ref; |
05c1eb10 JH |
774 | struct string_list cas_options = STRING_LIST_INIT_DUP; |
775 | struct string_list_item *cas_option; | |
ae4efe19 | 776 | |
c0aa335c | 777 | get_helper(transport); |
ae4efe19 SP |
778 | if (!data->push) |
779 | return 1; | |
780 | ||
781 | for (ref = remote_refs; ref; ref = ref->next) { | |
20e8b465 | 782 | if (!ref->peer_ref && !mirror) |
ae4efe19 SP |
783 | continue; |
784 | ||
20e8b465 TRC |
785 | /* Check for statuses set by set_ref_status_for_push() */ |
786 | switch (ref->status) { | |
787 | case REF_STATUS_REJECT_NONFASTFORWARD: | |
631b5ef2 | 788 | case REF_STATUS_REJECT_STALE: |
dbfeddb1 | 789 | case REF_STATUS_REJECT_ALREADY_EXISTS: |
20e8b465 | 790 | case REF_STATUS_UPTODATE: |
ae4efe19 | 791 | continue; |
20e8b465 TRC |
792 | default: |
793 | ; /* do nothing */ | |
ae4efe19 SP |
794 | } |
795 | ||
796 | if (force_all) | |
797 | ref->force = 1; | |
798 | ||
799 | strbuf_addstr(&buf, "push "); | |
800 | if (!ref->deletion) { | |
801 | if (ref->force) | |
802 | strbuf_addch(&buf, '+'); | |
803 | if (ref->peer_ref) | |
804 | strbuf_addstr(&buf, ref->peer_ref->name); | |
805 | else | |
806 | strbuf_addstr(&buf, sha1_to_hex(ref->new_sha1)); | |
807 | } | |
808 | strbuf_addch(&buf, ':'); | |
809 | strbuf_addstr(&buf, ref->name); | |
810 | strbuf_addch(&buf, '\n'); | |
05c1eb10 JH |
811 | |
812 | /* | |
813 | * The "--force-with-lease" options without explicit | |
814 | * values to expect have already been expanded into | |
815 | * the ref->old_sha1_expect[] field; we can ignore | |
816 | * transport->smart_options->cas altogether and instead | |
817 | * can enumerate them from the refs. | |
818 | */ | |
819 | if (ref->expect_old_sha1) { | |
820 | struct strbuf cas = STRBUF_INIT; | |
821 | strbuf_addf(&cas, "%s:%s", | |
822 | ref->name, sha1_to_hex(ref->old_sha1_expect)); | |
823 | string_list_append(&cas_options, strbuf_detach(&cas, NULL)); | |
824 | } | |
ae4efe19 | 825 | } |
05c1eb10 JH |
826 | if (buf.len == 0) { |
827 | string_list_clear(&cas_options, 0); | |
d8f67d20 | 828 | return 0; |
05c1eb10 | 829 | } |
ae4efe19 | 830 | |
ae4efe19 | 831 | standard_options(transport); |
05c1eb10 JH |
832 | for_each_string_list_item(cas_option, &cas_options) |
833 | set_helper_option(transport, "cas", cas_option->string); | |
ae4efe19 SP |
834 | |
835 | if (flags & TRANSPORT_PUSH_DRY_RUN) { | |
836 | if (set_helper_option(transport, "dry-run", "true") != 0) | |
837 | die("helper %s does not support dry-run", data->name); | |
838 | } | |
839 | ||
840 | strbuf_addch(&buf, '\n'); | |
bf3c523c | 841 | sendline(data, &buf); |
ae4efe19 | 842 | strbuf_release(&buf); |
d2e73c6f | 843 | |
5a75353f | 844 | push_update_refs_status(data, remote_refs, flags); |
ae4efe19 SP |
845 | return 0; |
846 | } | |
847 | ||
73b49a75 SR |
848 | static int push_refs_with_export(struct transport *transport, |
849 | struct ref *remote_refs, int flags) | |
850 | { | |
851 | struct ref *ref; | |
852 | struct child_process *helper, exporter; | |
853 | struct helper_data *data = transport->data; | |
183113a5 | 854 | struct string_list revlist_args = STRING_LIST_INIT_NODUP; |
73b49a75 SR |
855 | struct strbuf buf = STRBUF_INIT; |
856 | ||
21610d82 FC |
857 | if (!data->refspecs) |
858 | die("remote-helper doesn't support push; refspec needed"); | |
859 | ||
21457f57 FC |
860 | if (flags & TRANSPORT_PUSH_DRY_RUN) { |
861 | if (set_helper_option(transport, "dry-run", "true") != 0) | |
862 | die("helper %s does not support dry-run", data->name); | |
863 | } | |
864 | ||
510fa6f5 FC |
865 | if (flags & TRANSPORT_PUSH_FORCE) { |
866 | if (set_helper_option(transport, "force", "true") != 0) | |
867 | warning("helper %s does not support 'force'", data->name); | |
868 | } | |
869 | ||
73b49a75 SR |
870 | helper = get_helper(transport); |
871 | ||
872 | write_constant(helper->in, "export\n"); | |
873 | ||
73b49a75 SR |
874 | strbuf_reset(&buf); |
875 | ||
876 | for (ref = remote_refs; ref; ref = ref->next) { | |
877 | char *private; | |
878 | unsigned char sha1[20]; | |
879 | ||
9c51558c FC |
880 | if (ref->deletion) |
881 | die("remote-helpers do not support ref deletion"); | |
882 | ||
73b49a75 SR |
883 | private = apply_refspecs(data->refspecs, data->refspec_nr, ref->name); |
884 | if (private && !get_sha1(private, sha1)) { | |
885 | strbuf_addf(&buf, "^%s", private); | |
1d2f80fa | 886 | string_list_append(&revlist_args, strbuf_detach(&buf, NULL)); |
b056620f | 887 | hashcpy(ref->old_sha1, sha1); |
73b49a75 | 888 | } |
2faa1527 | 889 | free(private); |
73b49a75 | 890 | |
67c9c782 FC |
891 | if (ref->peer_ref) { |
892 | if (strcmp(ref->peer_ref->name, ref->name)) | |
893 | die("remote-helpers do not support old:new syntax"); | |
3ea7d094 | 894 | string_list_append(&revlist_args, ref->peer_ref->name); |
67c9c782 | 895 | } |
73b49a75 SR |
896 | } |
897 | ||
a515ebe9 | 898 | if (get_exporter(transport, &exporter, &revlist_args)) |
73b49a75 SR |
899 | die("Couldn't run fast-export"); |
900 | ||
cc567322 SR |
901 | if (finish_command(&exporter)) |
902 | die("Error while running fast-export"); | |
5a75353f | 903 | push_update_refs_status(data, remote_refs, flags); |
73b49a75 SR |
904 | return 0; |
905 | } | |
906 | ||
907 | static int push_refs(struct transport *transport, | |
908 | struct ref *remote_refs, int flags) | |
909 | { | |
910 | struct helper_data *data = transport->data; | |
911 | ||
912 | if (process_connect(transport, 1)) { | |
913 | do_take_over(transport); | |
914 | return transport->push_refs(transport, remote_refs, flags); | |
915 | } | |
916 | ||
917 | if (!remote_refs) { | |
918 | fprintf(stderr, "No refs in common and none specified; doing nothing.\n" | |
919 | "Perhaps you should specify a branch such as 'master'.\n"); | |
920 | return 0; | |
921 | } | |
922 | ||
923 | if (data->push) | |
924 | return push_refs_with_push(transport, remote_refs, flags); | |
925 | ||
926 | if (data->export) | |
927 | return push_refs_with_export(transport, remote_refs, flags); | |
928 | ||
929 | return -1; | |
930 | } | |
931 | ||
932 | ||
f8ec9167 DB |
933 | static int has_attribute(const char *attrs, const char *attr) { |
934 | int len; | |
935 | if (!attrs) | |
936 | return 0; | |
937 | ||
938 | len = strlen(attr); | |
939 | for (;;) { | |
940 | const char *space = strchrnul(attrs, ' '); | |
941 | if (len == space - attrs && !strncmp(attrs, attr, len)) | |
942 | return 1; | |
943 | if (!*space) | |
944 | return 0; | |
945 | attrs = space + 1; | |
946 | } | |
947 | } | |
948 | ||
6eb996b5 DB |
949 | static struct ref *get_refs_list(struct transport *transport, int for_push) |
950 | { | |
292ce46b | 951 | struct helper_data *data = transport->data; |
6eb996b5 DB |
952 | struct child_process *helper; |
953 | struct ref *ret = NULL; | |
954 | struct ref **tail = &ret; | |
955 | struct ref *posn; | |
956 | struct strbuf buf = STRBUF_INIT; | |
6eb996b5 DB |
957 | |
958 | helper = get_helper(transport); | |
2d14d65c | 959 | |
fa8c097c IL |
960 | if (process_connect(transport, for_push)) { |
961 | do_take_over(transport); | |
962 | return transport->get_refs_list(transport, for_push); | |
963 | } | |
964 | ||
ae4efe19 SP |
965 | if (data->push && for_push) |
966 | write_str_in_full(helper->in, "list for-push\n"); | |
967 | else | |
968 | write_str_in_full(helper->in, "list\n"); | |
6eb996b5 | 969 | |
6eb996b5 DB |
970 | while (1) { |
971 | char *eov, *eon; | |
bf3c523c | 972 | recvline(data, &buf); |
6eb996b5 DB |
973 | |
974 | if (!*buf.buf) | |
975 | break; | |
976 | ||
977 | eov = strchr(buf.buf, ' '); | |
978 | if (!eov) | |
979 | die("Malformed response in ref list: %s", buf.buf); | |
980 | eon = strchr(eov + 1, ' '); | |
981 | *eov = '\0'; | |
982 | if (eon) | |
983 | *eon = '\0'; | |
984 | *tail = alloc_ref(eov + 1); | |
985 | if (buf.buf[0] == '@') | |
986 | (*tail)->symref = xstrdup(buf.buf + 1); | |
987 | else if (buf.buf[0] != '?') | |
988 | get_sha1_hex(buf.buf, (*tail)->old_sha1); | |
f8ec9167 DB |
989 | if (eon) { |
990 | if (has_attribute(eon + 1, "unchanged")) { | |
991 | (*tail)->status |= REF_STATUS_UPTODATE; | |
992 | read_ref((*tail)->name, (*tail)->old_sha1); | |
993 | } | |
994 | } | |
6eb996b5 DB |
995 | tail = &((*tail)->next); |
996 | } | |
bf3c523c IL |
997 | if (debug) |
998 | fprintf(stderr, "Debug: Read ref listing.\n"); | |
6eb996b5 DB |
999 | strbuf_release(&buf); |
1000 | ||
1001 | for (posn = ret; posn; posn = posn->next) | |
1002 | resolve_remote_symref(posn, ret); | |
1003 | ||
1004 | return ret; | |
1005 | } | |
1006 | ||
c9e388bb | 1007 | int transport_helper_init(struct transport *transport, const char *name) |
6eb996b5 DB |
1008 | { |
1009 | struct helper_data *data = xcalloc(sizeof(*data), 1); | |
c9e388bb | 1010 | data->name = name; |
6eb996b5 | 1011 | |
bf3c523c IL |
1012 | if (getenv("GIT_TRANSPORT_HELPER_DEBUG")) |
1013 | debug = 1; | |
1014 | ||
6eb996b5 | 1015 | transport->data = data; |
ef08ef9e | 1016 | transport->set_option = set_helper_option; |
6eb996b5 DB |
1017 | transport->get_refs_list = get_refs_list; |
1018 | transport->fetch = fetch; | |
ae4efe19 | 1019 | transport->push_refs = push_refs; |
f2a37151 | 1020 | transport->disconnect = release_helper; |
b236752a | 1021 | transport->connect = connect_helper; |
61b075bd | 1022 | transport->smart_options = &(data->transport_options); |
6eb996b5 DB |
1023 | return 0; |
1024 | } | |
419f37db IL |
1025 | |
1026 | /* | |
1027 | * Linux pipes can buffer 65536 bytes at once (and most platforms can | |
1028 | * buffer less), so attempt reads and writes with up to that size. | |
1029 | */ | |
1030 | #define BUFFERSIZE 65536 | |
1031 | /* This should be enough to hold debugging message. */ | |
1032 | #define PBUFFERSIZE 8192 | |
1033 | ||
1034 | /* Print bidirectional transfer loop debug message. */ | |
4621085b | 1035 | __attribute__((format (printf, 1, 2))) |
419f37db IL |
1036 | static void transfer_debug(const char *fmt, ...) |
1037 | { | |
1038 | va_list args; | |
1039 | char msgbuf[PBUFFERSIZE]; | |
1040 | static int debug_enabled = -1; | |
1041 | ||
1042 | if (debug_enabled < 0) | |
1043 | debug_enabled = getenv("GIT_TRANSLOOP_DEBUG") ? 1 : 0; | |
1044 | if (!debug_enabled) | |
1045 | return; | |
1046 | ||
1047 | va_start(args, fmt); | |
1048 | vsnprintf(msgbuf, PBUFFERSIZE, fmt, args); | |
1049 | va_end(args); | |
1050 | fprintf(stderr, "Transfer loop debugging: %s\n", msgbuf); | |
1051 | } | |
1052 | ||
1053 | /* Stream state: More data may be coming in this direction. */ | |
1054 | #define SSTATE_TRANSFERING 0 | |
1055 | /* | |
1056 | * Stream state: No more data coming in this direction, flushing rest of | |
1057 | * data. | |
1058 | */ | |
1059 | #define SSTATE_FLUSHING 1 | |
1060 | /* Stream state: Transfer in this direction finished. */ | |
1061 | #define SSTATE_FINISHED 2 | |
1062 | ||
1063 | #define STATE_NEEDS_READING(state) ((state) <= SSTATE_TRANSFERING) | |
1064 | #define STATE_NEEDS_WRITING(state) ((state) <= SSTATE_FLUSHING) | |
1065 | #define STATE_NEEDS_CLOSING(state) ((state) == SSTATE_FLUSHING) | |
1066 | ||
1067 | /* Unidirectional transfer. */ | |
1068 | struct unidirectional_transfer { | |
1069 | /* Source */ | |
1070 | int src; | |
1071 | /* Destination */ | |
1072 | int dest; | |
1073 | /* Is source socket? */ | |
1074 | int src_is_sock; | |
1075 | /* Is destination socket? */ | |
1076 | int dest_is_sock; | |
41ccfdd9 | 1077 | /* Transfer state (TRANSFERRING/FLUSHING/FINISHED) */ |
419f37db IL |
1078 | int state; |
1079 | /* Buffer. */ | |
1080 | char buf[BUFFERSIZE]; | |
1081 | /* Buffer used. */ | |
1082 | size_t bufuse; | |
1083 | /* Name of source. */ | |
1084 | const char *src_name; | |
1085 | /* Name of destination. */ | |
1086 | const char *dest_name; | |
1087 | }; | |
1088 | ||
1089 | /* Closes the target (for writing) if transfer has finished. */ | |
1090 | static void udt_close_if_finished(struct unidirectional_transfer *t) | |
1091 | { | |
1092 | if (STATE_NEEDS_CLOSING(t->state) && !t->bufuse) { | |
1093 | t->state = SSTATE_FINISHED; | |
1094 | if (t->dest_is_sock) | |
1095 | shutdown(t->dest, SHUT_WR); | |
1096 | else | |
1097 | close(t->dest); | |
1098 | transfer_debug("Closed %s.", t->dest_name); | |
1099 | } | |
1100 | } | |
1101 | ||
1102 | /* | |
1103 | * Tries to read read data from source into buffer. If buffer is full, | |
1104 | * no data is read. Returns 0 on success, -1 on error. | |
1105 | */ | |
1106 | static int udt_do_read(struct unidirectional_transfer *t) | |
1107 | { | |
1108 | ssize_t bytes; | |
1109 | ||
1110 | if (t->bufuse == BUFFERSIZE) | |
1111 | return 0; /* No space for more. */ | |
1112 | ||
1113 | transfer_debug("%s is readable", t->src_name); | |
1114 | bytes = read(t->src, t->buf + t->bufuse, BUFFERSIZE - t->bufuse); | |
1115 | if (bytes < 0 && errno != EWOULDBLOCK && errno != EAGAIN && | |
1116 | errno != EINTR) { | |
1117 | error("read(%s) failed: %s", t->src_name, strerror(errno)); | |
1118 | return -1; | |
1119 | } else if (bytes == 0) { | |
1120 | transfer_debug("%s EOF (with %i bytes in buffer)", | |
4621085b | 1121 | t->src_name, (int)t->bufuse); |
419f37db IL |
1122 | t->state = SSTATE_FLUSHING; |
1123 | } else if (bytes > 0) { | |
1124 | t->bufuse += bytes; | |
1125 | transfer_debug("Read %i bytes from %s (buffer now at %i)", | |
1126 | (int)bytes, t->src_name, (int)t->bufuse); | |
1127 | } | |
1128 | return 0; | |
1129 | } | |
1130 | ||
1131 | /* Tries to write data from buffer into destination. If buffer is empty, | |
1132 | * no data is written. Returns 0 on success, -1 on error. | |
1133 | */ | |
1134 | static int udt_do_write(struct unidirectional_transfer *t) | |
1135 | { | |
803dbdb9 | 1136 | ssize_t bytes; |
419f37db IL |
1137 | |
1138 | if (t->bufuse == 0) | |
1139 | return 0; /* Nothing to write. */ | |
1140 | ||
1141 | transfer_debug("%s is writable", t->dest_name); | |
7edc02f4 EFL |
1142 | bytes = xwrite(t->dest, t->buf, t->bufuse); |
1143 | if (bytes < 0 && errno != EWOULDBLOCK) { | |
419f37db IL |
1144 | error("write(%s) failed: %s", t->dest_name, strerror(errno)); |
1145 | return -1; | |
1146 | } else if (bytes > 0) { | |
1147 | t->bufuse -= bytes; | |
1148 | if (t->bufuse) | |
1149 | memmove(t->buf, t->buf + bytes, t->bufuse); | |
1150 | transfer_debug("Wrote %i bytes to %s (buffer now at %i)", | |
1151 | (int)bytes, t->dest_name, (int)t->bufuse); | |
1152 | } | |
1153 | return 0; | |
1154 | } | |
1155 | ||
1156 | ||
1157 | /* State of bidirectional transfer loop. */ | |
1158 | struct bidirectional_transfer_state { | |
1159 | /* Direction from program to git. */ | |
1160 | struct unidirectional_transfer ptg; | |
1161 | /* Direction from git to program. */ | |
1162 | struct unidirectional_transfer gtp; | |
1163 | }; | |
1164 | ||
1165 | static void *udt_copy_task_routine(void *udt) | |
1166 | { | |
1167 | struct unidirectional_transfer *t = (struct unidirectional_transfer *)udt; | |
1168 | while (t->state != SSTATE_FINISHED) { | |
1169 | if (STATE_NEEDS_READING(t->state)) | |
1170 | if (udt_do_read(t)) | |
1171 | return NULL; | |
1172 | if (STATE_NEEDS_WRITING(t->state)) | |
1173 | if (udt_do_write(t)) | |
1174 | return NULL; | |
1175 | if (STATE_NEEDS_CLOSING(t->state)) | |
1176 | udt_close_if_finished(t); | |
1177 | } | |
1178 | return udt; /* Just some non-NULL value. */ | |
1179 | } | |
1180 | ||
1181 | #ifndef NO_PTHREADS | |
1182 | ||
1183 | /* | |
98e023de | 1184 | * Join thread, with appropriate errors on failure. Name is name for the |
419f37db IL |
1185 | * thread (for error messages). Returns 0 on success, 1 on failure. |
1186 | */ | |
1187 | static int tloop_join(pthread_t thread, const char *name) | |
1188 | { | |
1189 | int err; | |
1190 | void *tret; | |
1191 | err = pthread_join(thread, &tret); | |
1192 | if (!tret) { | |
1193 | error("%s thread failed", name); | |
1194 | return 1; | |
1195 | } | |
1196 | if (err) { | |
1197 | error("%s thread failed to join: %s", name, strerror(err)); | |
1198 | return 1; | |
1199 | } | |
1200 | return 0; | |
1201 | } | |
1202 | ||
1203 | /* | |
1204 | * Spawn the transfer tasks and then wait for them. Returns 0 on success, | |
1205 | * -1 on failure. | |
1206 | */ | |
1207 | static int tloop_spawnwait_tasks(struct bidirectional_transfer_state *s) | |
1208 | { | |
1209 | pthread_t gtp_thread; | |
1210 | pthread_t ptg_thread; | |
1211 | int err; | |
1212 | int ret = 0; | |
1213 | err = pthread_create(>p_thread, NULL, udt_copy_task_routine, | |
1214 | &s->gtp); | |
1215 | if (err) | |
1216 | die("Can't start thread for copying data: %s", strerror(err)); | |
1217 | err = pthread_create(&ptg_thread, NULL, udt_copy_task_routine, | |
1218 | &s->ptg); | |
1219 | if (err) | |
1220 | die("Can't start thread for copying data: %s", strerror(err)); | |
1221 | ||
1222 | ret |= tloop_join(gtp_thread, "Git to program copy"); | |
1223 | ret |= tloop_join(ptg_thread, "Program to git copy"); | |
1224 | return ret; | |
1225 | } | |
1226 | #else | |
1227 | ||
1228 | /* Close the source and target (for writing) for transfer. */ | |
1229 | static void udt_kill_transfer(struct unidirectional_transfer *t) | |
1230 | { | |
1231 | t->state = SSTATE_FINISHED; | |
1232 | /* | |
1233 | * Socket read end left open isn't a disaster if nobody | |
1234 | * attempts to read from it (mingw compat headers do not | |
1235 | * have SHUT_RD)... | |
1236 | * | |
1237 | * We can't fully close the socket since otherwise gtp | |
1238 | * task would first close the socket it sends data to | |
1239 | * while closing the ptg file descriptors. | |
1240 | */ | |
1241 | if (!t->src_is_sock) | |
1242 | close(t->src); | |
1243 | if (t->dest_is_sock) | |
1244 | shutdown(t->dest, SHUT_WR); | |
1245 | else | |
1246 | close(t->dest); | |
1247 | } | |
1248 | ||
1249 | /* | |
98e023de | 1250 | * Join process, with appropriate errors on failure. Name is name for the |
419f37db IL |
1251 | * process (for error messages). Returns 0 on success, 1 on failure. |
1252 | */ | |
1253 | static int tloop_join(pid_t pid, const char *name) | |
1254 | { | |
1255 | int tret; | |
1256 | if (waitpid(pid, &tret, 0) < 0) { | |
1257 | error("%s process failed to wait: %s", name, strerror(errno)); | |
1258 | return 1; | |
1259 | } | |
1260 | if (!WIFEXITED(tret) || WEXITSTATUS(tret)) { | |
1261 | error("%s process failed", name); | |
1262 | return 1; | |
1263 | } | |
1264 | return 0; | |
1265 | } | |
1266 | ||
1267 | /* | |
1268 | * Spawn the transfer tasks and then wait for them. Returns 0 on success, | |
1269 | * -1 on failure. | |
1270 | */ | |
1271 | static int tloop_spawnwait_tasks(struct bidirectional_transfer_state *s) | |
1272 | { | |
1273 | pid_t pid1, pid2; | |
1274 | int ret = 0; | |
1275 | ||
1276 | /* Fork thread #1: git to program. */ | |
1277 | pid1 = fork(); | |
1278 | if (pid1 < 0) | |
1279 | die_errno("Can't start thread for copying data"); | |
1280 | else if (pid1 == 0) { | |
1281 | udt_kill_transfer(&s->ptg); | |
1282 | exit(udt_copy_task_routine(&s->gtp) ? 0 : 1); | |
1283 | } | |
1284 | ||
1285 | /* Fork thread #2: program to git. */ | |
1286 | pid2 = fork(); | |
1287 | if (pid2 < 0) | |
1288 | die_errno("Can't start thread for copying data"); | |
1289 | else if (pid2 == 0) { | |
1290 | udt_kill_transfer(&s->gtp); | |
1291 | exit(udt_copy_task_routine(&s->ptg) ? 0 : 1); | |
1292 | } | |
1293 | ||
1294 | /* | |
1295 | * Close both streams in parent as to not interfere with | |
1296 | * end of file detection and wait for both tasks to finish. | |
1297 | */ | |
1298 | udt_kill_transfer(&s->gtp); | |
1299 | udt_kill_transfer(&s->ptg); | |
1300 | ret |= tloop_join(pid1, "Git to program copy"); | |
1301 | ret |= tloop_join(pid2, "Program to git copy"); | |
1302 | return ret; | |
1303 | } | |
1304 | #endif | |
1305 | ||
1306 | /* | |
1307 | * Copies data from stdin to output and from input to stdout simultaneously. | |
1308 | * Additionally filtering through given filter. If filter is NULL, uses | |
1309 | * identity filter. | |
1310 | */ | |
1311 | int bidirectional_transfer_loop(int input, int output) | |
1312 | { | |
1313 | struct bidirectional_transfer_state state; | |
1314 | ||
1315 | /* Fill the state fields. */ | |
1316 | state.ptg.src = input; | |
1317 | state.ptg.dest = 1; | |
1318 | state.ptg.src_is_sock = (input == output); | |
1319 | state.ptg.dest_is_sock = 0; | |
1320 | state.ptg.state = SSTATE_TRANSFERING; | |
1321 | state.ptg.bufuse = 0; | |
1322 | state.ptg.src_name = "remote input"; | |
1323 | state.ptg.dest_name = "stdout"; | |
1324 | ||
1325 | state.gtp.src = 0; | |
1326 | state.gtp.dest = output; | |
1327 | state.gtp.src_is_sock = 0; | |
1328 | state.gtp.dest_is_sock = (input == output); | |
1329 | state.gtp.state = SSTATE_TRANSFERING; | |
1330 | state.gtp.bufuse = 0; | |
1331 | state.gtp.src_name = "stdin"; | |
1332 | state.gtp.dest_name = "remote output"; | |
1333 | ||
1334 | return tloop_spawnwait_tasks(&state); | |
1335 | } |