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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" | |
72ff8943 | 8 | #include "remote.h" |
73b49a75 | 9 | #include "string-list.h" |
7851b1e6 | 10 | #include "thread-utils.h" |
c34fe630 | 11 | #include "sigchain.h" |
bfc366d9 | 12 | #include "argv-array.h" |
664059fb | 13 | #include "refs.h" |
7851b1e6 | 14 | |
bf3c523c IL |
15 | static int debug; |
16 | ||
9cba13ca | 17 | struct helper_data { |
6eb996b5 DB |
18 | const char *name; |
19 | struct child_process *helper; | |
292ce46b | 20 | FILE *out; |
ef08ef9e | 21 | unsigned fetch : 1, |
a24a32dd | 22 | import : 1, |
bfc366d9 | 23 | bidi_import : 1, |
73b49a75 | 24 | export : 1, |
ae4efe19 | 25 | option : 1, |
fa8c097c IL |
26 | push : 1, |
27 | connect : 1, | |
0d957a4d | 28 | signed_tags : 1, |
9ba38048 | 29 | check_connectivity : 1, |
597b831a MM |
30 | no_disconnect_req : 1, |
31 | no_private_update : 1; | |
a515ebe9 SR |
32 | char *export_marks; |
33 | char *import_marks; | |
72ff8943 DB |
34 | /* These go from remote name (as in "list") to private name */ |
35 | struct refspec *refspecs; | |
36 | int refspec_nr; | |
61b075bd IL |
37 | /* Transport options for fetch-pack/send-pack (should one of |
38 | * those be invoked). | |
39 | */ | |
40 | struct git_transport_options transport_options; | |
6eb996b5 DB |
41 | }; |
42 | ||
bf3c523c IL |
43 | static void sendline(struct helper_data *helper, struct strbuf *buffer) |
44 | { | |
45 | if (debug) | |
46 | fprintf(stderr, "Debug: Remote helper: -> %s", buffer->buf); | |
47 | if (write_in_full(helper->helper->in, buffer->buf, buffer->len) | |
48 | != buffer->len) | |
49 | die_errno("Full write to remote helper failed"); | |
50 | } | |
51 | ||
c096955c | 52 | static int recvline_fh(FILE *helper, struct strbuf *buffer, const char *name) |
bf3c523c IL |
53 | { |
54 | strbuf_reset(buffer); | |
55 | if (debug) | |
56 | fprintf(stderr, "Debug: Remote helper: Waiting...\n"); | |
fa8c097c | 57 | if (strbuf_getline(buffer, helper, '\n') == EOF) { |
bf3c523c IL |
58 | if (debug) |
59 | fprintf(stderr, "Debug: Remote helper quit.\n"); | |
5931b33e | 60 | return 1; |
bf3c523c IL |
61 | } |
62 | ||
63 | if (debug) | |
64 | fprintf(stderr, "Debug: Remote helper: <- %s\n", buffer->buf); | |
65 | return 0; | |
66 | } | |
67 | ||
fa8c097c IL |
68 | static int recvline(struct helper_data *helper, struct strbuf *buffer) |
69 | { | |
c096955c | 70 | return recvline_fh(helper->out, buffer, helper->name); |
fa8c097c IL |
71 | } |
72 | ||
bf3c523c IL |
73 | static void write_constant(int fd, const char *str) |
74 | { | |
75 | if (debug) | |
76 | fprintf(stderr, "Debug: Remote helper: -> %s", str); | |
77 | if (write_in_full(fd, str, strlen(str)) != strlen(str)) | |
78 | die_errno("Full write to remote helper failed"); | |
79 | } | |
80 | ||
c2e86add | 81 | static const char *remove_ext_force(const char *url) |
25d5cc48 IL |
82 | { |
83 | if (url) { | |
84 | const char *colon = strchr(url, ':'); | |
85 | if (colon && colon[1] == ':') | |
86 | return colon + 2; | |
87 | } | |
88 | return url; | |
89 | } | |
90 | ||
fa8c097c IL |
91 | static void do_take_over(struct transport *transport) |
92 | { | |
93 | struct helper_data *data; | |
94 | data = (struct helper_data *)transport->data; | |
95 | transport_take_over(transport, data->helper); | |
96 | fclose(data->out); | |
97 | free(data); | |
98 | } | |
99 | ||
2879bc3b MH |
100 | static void standard_options(struct transport *t); |
101 | ||
6eb996b5 DB |
102 | static struct child_process *get_helper(struct transport *transport) |
103 | { | |
104 | struct helper_data *data = transport->data; | |
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; |
6eb996b5 DB |
112 | |
113 | if (data->helper) | |
114 | return data->helper; | |
115 | ||
483bbd4e RS |
116 | helper = xmalloc(sizeof(*helper)); |
117 | child_process_init(helper); | |
6eb996b5 DB |
118 | helper->in = -1; |
119 | helper->out = -1; | |
120 | helper->err = 0; | |
e0ab2ac6 JK |
121 | argv_array_pushf(&helper->args, "git-remote-%s", data->name); |
122 | argv_array_push(&helper->args, transport->remote->name); | |
123 | argv_array_push(&helper->args, remove_ext_force(transport->url)); | |
6b02de3b IL |
124 | helper->git_cmd = 0; |
125 | helper->silent_exec_failure = 1; | |
e1735872 | 126 | |
a9154590 RS |
127 | argv_array_pushf(&helper->env_array, "%s=%s", GIT_DIR_ENVIRONMENT, |
128 | get_git_dir()); | |
e1735872 | 129 | |
6b02de3b IL |
130 | code = start_command(helper); |
131 | if (code < 0 && errno == ENOENT) | |
132 | die("Unable to find remote helper for '%s'", data->name); | |
133 | else if (code != 0) | |
134 | exit(code); | |
135 | ||
6eb996b5 | 136 | data->helper = helper; |
fa8c097c | 137 | data->no_disconnect_req = 0; |
6eb996b5 | 138 | |
61b075bd IL |
139 | /* |
140 | * Open the output as FILE* so strbuf_getline() can be used. | |
141 | * Do this with duped fd because fclose() will close the fd, | |
142 | * and stuff like taking over will require the fd to remain. | |
61b075bd IL |
143 | */ |
144 | duped = dup(helper->out); | |
145 | if (duped < 0) | |
146 | die_errno("Can't dup helper output fd"); | |
147 | data->out = xfdopen(duped, "r"); | |
148 | ||
bf3c523c | 149 | write_constant(helper->in, "capabilities\n"); |
2d14d65c | 150 | |
6eb996b5 | 151 | while (1) { |
21a2d4ad | 152 | const char *capname, *arg; |
28ed5b35 | 153 | int mandatory = 0; |
5931b33e FC |
154 | if (recvline(data, &buf)) |
155 | exit(128); | |
6eb996b5 DB |
156 | |
157 | if (!*buf.buf) | |
158 | break; | |
28ed5b35 IL |
159 | |
160 | if (*buf.buf == '*') { | |
161 | capname = buf.buf + 1; | |
162 | mandatory = 1; | |
163 | } else | |
164 | capname = buf.buf; | |
165 | ||
bf3c523c | 166 | if (debug) |
28ed5b35 IL |
167 | fprintf(stderr, "Debug: Got cap %s\n", capname); |
168 | if (!strcmp(capname, "fetch")) | |
6eb996b5 | 169 | data->fetch = 1; |
28ed5b35 | 170 | else if (!strcmp(capname, "option")) |
ef08ef9e | 171 | data->option = 1; |
28ed5b35 | 172 | else if (!strcmp(capname, "push")) |
ae4efe19 | 173 | data->push = 1; |
28ed5b35 | 174 | else if (!strcmp(capname, "import")) |
e65e91ed | 175 | data->import = 1; |
bfc366d9 FA |
176 | else if (!strcmp(capname, "bidi-import")) |
177 | data->bidi_import = 1; | |
73b49a75 SR |
178 | else if (!strcmp(capname, "export")) |
179 | data->export = 1; | |
9ba38048 NTND |
180 | else if (!strcmp(capname, "check-connectivity")) |
181 | data->check_connectivity = 1; | |
21a2d4ad | 182 | else if (!data->refspecs && skip_prefix(capname, "refspec ", &arg)) { |
72ff8943 DB |
183 | ALLOC_GROW(refspecs, |
184 | refspec_nr + 1, | |
185 | refspec_alloc); | |
21a2d4ad | 186 | refspecs[refspec_nr++] = xstrdup(arg); |
fa8c097c IL |
187 | } else if (!strcmp(capname, "connect")) { |
188 | data->connect = 1; | |
0d957a4d JK |
189 | } else if (!strcmp(capname, "signed-tags")) { |
190 | data->signed_tags = 1; | |
21a2d4ad JK |
191 | } else if (skip_prefix(capname, "export-marks ", &arg)) { |
192 | data->export_marks = xstrdup(arg); | |
193 | } else if (skip_prefix(capname, "import-marks ", &arg)) { | |
194 | data->import_marks = xstrdup(arg); | |
59556548 | 195 | } else if (starts_with(capname, "no-private-update")) { |
597b831a | 196 | data->no_private_update = 1; |
28ed5b35 | 197 | } else if (mandatory) { |
9517e6b8 | 198 | die("Unknown mandatory capability %s. This remote " |
82247e9b | 199 | "helper probably needs newer version of Git.", |
28ed5b35 | 200 | capname); |
72ff8943 DB |
201 | } |
202 | } | |
203 | if (refspecs) { | |
204 | int i; | |
205 | data->refspec_nr = refspec_nr; | |
206 | data->refspecs = parse_fetch_refspec(refspec_nr, refspecs); | |
b120ef3e | 207 | for (i = 0; i < refspec_nr; i++) |
72ff8943 | 208 | free((char *)refspecs[i]); |
72ff8943 | 209 | free(refspecs); |
a93b4a09 FC |
210 | } else if (data->import || data->bidi_import || data->export) { |
211 | warning("This remote helper should implement refspec capability."); | |
6eb996b5 | 212 | } |
b962dbdc | 213 | strbuf_release(&buf); |
bf3c523c IL |
214 | if (debug) |
215 | fprintf(stderr, "Debug: Capabilities complete.\n"); | |
2879bc3b | 216 | standard_options(transport); |
6eb996b5 DB |
217 | return data->helper; |
218 | } | |
219 | ||
220 | static int disconnect_helper(struct transport *transport) | |
221 | { | |
222 | struct helper_data *data = transport->data; | |
cc567322 | 223 | int res = 0; |
bf3c523c | 224 | |
6eb996b5 | 225 | if (data->helper) { |
bf3c523c IL |
226 | if (debug) |
227 | fprintf(stderr, "Debug: Disconnecting.\n"); | |
fa8c097c | 228 | if (!data->no_disconnect_req) { |
c34fe630 JK |
229 | /* |
230 | * Ignore write errors; there's nothing we can do, | |
231 | * since we're about to close the pipe anyway. And the | |
232 | * most likely error is EPIPE due to the helper dying | |
233 | * to report an error itself. | |
234 | */ | |
235 | sigchain_push(SIGPIPE, SIG_IGN); | |
236 | xwrite(data->helper->in, "\n", 1); | |
237 | sigchain_pop(SIGPIPE); | |
fa8c097c | 238 | } |
6eb996b5 | 239 | close(data->helper->in); |
61b075bd | 240 | close(data->helper->out); |
292ce46b | 241 | fclose(data->out); |
cc567322 | 242 | res = finish_command(data->helper); |
6eb996b5 DB |
243 | free(data->helper); |
244 | data->helper = NULL; | |
245 | } | |
cc567322 | 246 | return res; |
6eb996b5 DB |
247 | } |
248 | ||
ef08ef9e SP |
249 | static const char *unsupported_options[] = { |
250 | TRANS_OPT_UPLOADPACK, | |
251 | TRANS_OPT_RECEIVEPACK, | |
252 | TRANS_OPT_THIN, | |
253 | TRANS_OPT_KEEP | |
254 | }; | |
23cd01ec | 255 | |
ef08ef9e SP |
256 | static const char *boolean_options[] = { |
257 | TRANS_OPT_THIN, | |
258 | TRANS_OPT_KEEP, | |
0ea47f9d | 259 | TRANS_OPT_FOLLOWTAGS, |
ef08ef9e SP |
260 | }; |
261 | ||
262 | static int set_helper_option(struct transport *transport, | |
263 | const char *name, const char *value) | |
264 | { | |
265 | struct helper_data *data = transport->data; | |
ef08ef9e SP |
266 | struct strbuf buf = STRBUF_INIT; |
267 | int i, ret, is_bool = 0; | |
268 | ||
bf3c523c IL |
269 | get_helper(transport); |
270 | ||
ef08ef9e SP |
271 | if (!data->option) |
272 | return 1; | |
273 | ||
274 | for (i = 0; i < ARRAY_SIZE(unsupported_options); i++) { | |
275 | if (!strcmp(name, unsupported_options[i])) | |
276 | return 1; | |
277 | } | |
278 | ||
279 | for (i = 0; i < ARRAY_SIZE(boolean_options); i++) { | |
280 | if (!strcmp(name, boolean_options[i])) { | |
281 | is_bool = 1; | |
282 | break; | |
283 | } | |
284 | } | |
285 | ||
286 | strbuf_addf(&buf, "option %s ", name); | |
287 | if (is_bool) | |
288 | strbuf_addstr(&buf, value ? "true" : "false"); | |
289 | else | |
290 | quote_c_style(value, &buf, NULL, 0); | |
291 | strbuf_addch(&buf, '\n'); | |
292 | ||
4a1b59c8 | 293 | sendline(data, &buf); |
5931b33e FC |
294 | if (recvline(data, &buf)) |
295 | exit(128); | |
ef08ef9e SP |
296 | |
297 | if (!strcmp(buf.buf, "ok")) | |
298 | ret = 0; | |
59556548 | 299 | else if (starts_with(buf.buf, "error")) { |
ef08ef9e SP |
300 | ret = -1; |
301 | } else if (!strcmp(buf.buf, "unsupported")) | |
302 | ret = 1; | |
303 | else { | |
304 | warning("%s unexpectedly said: '%s'", data->name, buf.buf); | |
305 | ret = 1; | |
306 | } | |
307 | strbuf_release(&buf); | |
308 | return ret; | |
309 | } | |
310 | ||
311 | static void standard_options(struct transport *t) | |
312 | { | |
313 | char buf[16]; | |
314 | int n; | |
315 | int v = t->verbose; | |
ef08ef9e | 316 | |
d01b3c02 | 317 | set_helper_option(t, "progress", t->progress ? "true" : "false"); |
ef08ef9e SP |
318 | |
319 | n = snprintf(buf, sizeof(buf), "%d", v + 1); | |
320 | if (n >= sizeof(buf)) | |
321 | die("impossibly large verbosity value"); | |
322 | set_helper_option(t, "verbosity", buf); | |
323 | } | |
324 | ||
f2a37151 DB |
325 | static int release_helper(struct transport *transport) |
326 | { | |
cc567322 | 327 | int res = 0; |
72ff8943 DB |
328 | struct helper_data *data = transport->data; |
329 | free_refspec(data->refspec_nr, data->refspecs); | |
330 | data->refspecs = NULL; | |
cc567322 | 331 | res = disconnect_helper(transport); |
f2a37151 | 332 | free(transport->data); |
cc567322 | 333 | return res; |
f2a37151 DB |
334 | } |
335 | ||
6eb996b5 | 336 | static int fetch_with_fetch(struct transport *transport, |
37148311 | 337 | int nr_heads, struct ref **to_fetch) |
6eb996b5 | 338 | { |
292ce46b | 339 | struct helper_data *data = transport->data; |
6eb996b5 DB |
340 | int i; |
341 | struct strbuf buf = STRBUF_INIT; | |
342 | ||
343 | for (i = 0; i < nr_heads; i++) { | |
1088261f | 344 | const struct ref *posn = to_fetch[i]; |
6eb996b5 DB |
345 | if (posn->status & REF_STATUS_UPTODATE) |
346 | continue; | |
2d14d65c DB |
347 | |
348 | strbuf_addf(&buf, "fetch %s %s\n", | |
33cae542 MH |
349 | sha1_to_hex(posn->old_sha1), |
350 | posn->symref ? posn->symref : posn->name); | |
292ce46b | 351 | } |
2d14d65c | 352 | |
292ce46b | 353 | strbuf_addch(&buf, '\n'); |
bf3c523c | 354 | sendline(data, &buf); |
292ce46b SP |
355 | |
356 | while (1) { | |
5931b33e FC |
357 | if (recvline(data, &buf)) |
358 | exit(128); | |
292ce46b | 359 | |
59556548 | 360 | if (starts_with(buf.buf, "lock ")) { |
292ce46b SP |
361 | const char *name = buf.buf + 5; |
362 | if (transport->pack_lockfile) | |
363 | warning("%s also locked %s", data->name, name); | |
364 | else | |
365 | transport->pack_lockfile = xstrdup(name); | |
366 | } | |
9ba38048 NTND |
367 | else if (data->check_connectivity && |
368 | data->transport_options.check_self_contained_and_connected && | |
369 | !strcmp(buf.buf, "connectivity-ok")) | |
370 | data->transport_options.self_contained_and_connected = 1; | |
292ce46b SP |
371 | else if (!buf.len) |
372 | break; | |
373 | else | |
374 | warning("%s unexpectedly said: '%s'", data->name, buf.buf); | |
6eb996b5 | 375 | } |
292ce46b | 376 | strbuf_release(&buf); |
6eb996b5 DB |
377 | return 0; |
378 | } | |
379 | ||
e65e91ed DB |
380 | static int get_importer(struct transport *transport, struct child_process *fastimport) |
381 | { | |
382 | struct child_process *helper = get_helper(transport); | |
bfc366d9 | 383 | struct helper_data *data = transport->data; |
bfc366d9 | 384 | int cat_blob_fd, code; |
483bbd4e | 385 | child_process_init(fastimport); |
e65e91ed | 386 | fastimport->in = helper->out; |
173fd1a1 JK |
387 | argv_array_push(&fastimport->args, "fast-import"); |
388 | argv_array_push(&fastimport->args, debug ? "--stats" : "--quiet"); | |
e65e91ed | 389 | |
bfc366d9 FA |
390 | if (data->bidi_import) { |
391 | cat_blob_fd = xdup(helper->in); | |
173fd1a1 | 392 | argv_array_pushf(&fastimport->args, "--cat-blob-fd=%d", cat_blob_fd); |
bfc366d9 | 393 | } |
e65e91ed | 394 | fastimport->git_cmd = 1; |
bfc366d9 FA |
395 | |
396 | code = start_command(fastimport); | |
397 | return code; | |
e65e91ed DB |
398 | } |
399 | ||
73b49a75 SR |
400 | static int get_exporter(struct transport *transport, |
401 | struct child_process *fastexport, | |
73b49a75 SR |
402 | struct string_list *revlist_args) |
403 | { | |
a515ebe9 | 404 | struct helper_data *data = transport->data; |
73b49a75 | 405 | struct child_process *helper = get_helper(transport); |
2aeae40a | 406 | int i; |
852e54bc | 407 | |
8828f298 | 408 | child_process_init(fastexport); |
73b49a75 SR |
409 | |
410 | /* we need to duplicate helper->in because we want to use it after | |
411 | * fastexport is done with it. */ | |
412 | fastexport->out = dup(helper->in); | |
2aeae40a JK |
413 | argv_array_push(&fastexport->args, "fast-export"); |
414 | argv_array_push(&fastexport->args, "--use-done-feature"); | |
415 | argv_array_push(&fastexport->args, data->signed_tags ? | |
416 | "--signed-tags=verbatim" : "--signed-tags=warn-strip"); | |
417 | if (data->export_marks) | |
418 | argv_array_pushf(&fastexport->args, "--export-marks=%s.tmp", data->export_marks); | |
419 | if (data->import_marks) | |
420 | argv_array_pushf(&fastexport->args, "--import-marks=%s", data->import_marks); | |
73b49a75 SR |
421 | |
422 | for (i = 0; i < revlist_args->nr; i++) | |
2aeae40a | 423 | argv_array_push(&fastexport->args, revlist_args->items[i].string); |
73b49a75 SR |
424 | |
425 | fastexport->git_cmd = 1; | |
426 | return start_command(fastexport); | |
427 | } | |
428 | ||
e65e91ed DB |
429 | static int fetch_with_import(struct transport *transport, |
430 | int nr_heads, struct ref **to_fetch) | |
431 | { | |
432 | struct child_process fastimport; | |
72ff8943 | 433 | struct helper_data *data = transport->data; |
e65e91ed DB |
434 | int i; |
435 | struct ref *posn; | |
436 | struct strbuf buf = STRBUF_INIT; | |
437 | ||
bf3c523c IL |
438 | get_helper(transport); |
439 | ||
e65e91ed DB |
440 | if (get_importer(transport, &fastimport)) |
441 | die("Couldn't run fast-import"); | |
442 | ||
443 | for (i = 0; i < nr_heads; i++) { | |
444 | posn = to_fetch[i]; | |
445 | if (posn->status & REF_STATUS_UPTODATE) | |
446 | continue; | |
447 | ||
33cae542 MH |
448 | strbuf_addf(&buf, "import %s\n", |
449 | posn->symref ? posn->symref : posn->name); | |
bf3c523c | 450 | sendline(data, &buf); |
e65e91ed DB |
451 | strbuf_reset(&buf); |
452 | } | |
9504bc9d SR |
453 | |
454 | write_constant(data->helper->in, "\n"); | |
bfc366d9 FA |
455 | /* |
456 | * remote-helpers that advertise the bidi-import capability are required to | |
457 | * buffer the complete batch of import commands until this newline before | |
458 | * sending data to fast-import. | |
459 | * These helpers read back data from fast-import on their stdin, which could | |
460 | * be mixed with import commands, otherwise. | |
461 | */ | |
9504bc9d | 462 | |
cc567322 SR |
463 | if (finish_command(&fastimport)) |
464 | die("Error while running fast-import"); | |
e65e91ed | 465 | |
dff9d65d FA |
466 | /* |
467 | * The fast-import stream of a remote helper that advertises | |
468 | * the "refspec" capability writes to the refs named after the | |
469 | * right hand side of the first refspec matching each ref we | |
470 | * were fetching. | |
471 | * | |
472 | * (If no "refspec" capability was specified, for historical | |
7a43c554 | 473 | * reasons we default to the equivalent of *:*.) |
dff9d65d FA |
474 | * |
475 | * Store the result in to_fetch[i].old_sha1. Callers such | |
476 | * as "git fetch" can use the value to write feedback to the | |
477 | * terminal, populate FETCH_HEAD, and determine what new value | |
478 | * should be written to peer_ref if the update is a | |
479 | * fast-forward or this is a forced update. | |
480 | */ | |
e65e91ed | 481 | for (i = 0; i < nr_heads; i++) { |
33cae542 | 482 | char *private, *name; |
e65e91ed DB |
483 | posn = to_fetch[i]; |
484 | if (posn->status & REF_STATUS_UPTODATE) | |
485 | continue; | |
33cae542 | 486 | name = posn->symref ? posn->symref : posn->name; |
72ff8943 | 487 | if (data->refspecs) |
33cae542 | 488 | private = apply_refspecs(data->refspecs, data->refspec_nr, name); |
72ff8943 | 489 | else |
33cae542 | 490 | private = xstrdup(name); |
d51b720f | 491 | if (private) { |
ae25fd39 SB |
492 | if (read_ref(private, posn->old_sha1) < 0) |
493 | die("Could not read ref %s", private); | |
d51b720f MH |
494 | free(private); |
495 | } | |
e65e91ed | 496 | } |
b962dbdc | 497 | strbuf_release(&buf); |
e65e91ed DB |
498 | return 0; |
499 | } | |
500 | ||
fa8c097c IL |
501 | static int process_connect_service(struct transport *transport, |
502 | const char *name, const char *exec) | |
503 | { | |
504 | struct helper_data *data = transport->data; | |
505 | struct strbuf cmdbuf = STRBUF_INIT; | |
506 | struct child_process *helper; | |
507 | int r, duped, ret = 0; | |
508 | FILE *input; | |
509 | ||
510 | helper = get_helper(transport); | |
511 | ||
512 | /* | |
513 | * Yes, dup the pipe another time, as we need unbuffered version | |
514 | * of input pipe as FILE*. fclose() closes the underlying fd and | |
515 | * stream buffering only can be changed before first I/O operation | |
516 | * on it. | |
517 | */ | |
518 | duped = dup(helper->out); | |
519 | if (duped < 0) | |
520 | die_errno("Can't dup helper output fd"); | |
521 | input = xfdopen(duped, "r"); | |
522 | setvbuf(input, NULL, _IONBF, 0); | |
523 | ||
524 | /* | |
525 | * Handle --upload-pack and friends. This is fire and forget... | |
526 | * just warn if it fails. | |
527 | */ | |
528 | if (strcmp(name, exec)) { | |
529 | r = set_helper_option(transport, "servpath", exec); | |
530 | if (r > 0) | |
531 | warning("Setting remote service path not supported by protocol."); | |
532 | else if (r < 0) | |
533 | warning("Invalid remote service path."); | |
534 | } | |
535 | ||
536 | if (data->connect) | |
537 | strbuf_addf(&cmdbuf, "connect %s\n", name); | |
538 | else | |
539 | goto exit; | |
540 | ||
541 | sendline(data, &cmdbuf); | |
5931b33e FC |
542 | if (recvline_fh(input, &cmdbuf, name)) |
543 | exit(128); | |
544 | ||
fa8c097c IL |
545 | if (!strcmp(cmdbuf.buf, "")) { |
546 | data->no_disconnect_req = 1; | |
547 | if (debug) | |
548 | fprintf(stderr, "Debug: Smart transport connection " | |
549 | "ready.\n"); | |
550 | ret = 1; | |
551 | } else if (!strcmp(cmdbuf.buf, "fallback")) { | |
552 | if (debug) | |
553 | fprintf(stderr, "Debug: Falling back to dumb " | |
554 | "transport.\n"); | |
555 | } else | |
556 | die("Unknown response to connect: %s", | |
557 | cmdbuf.buf); | |
558 | ||
559 | exit: | |
560 | fclose(input); | |
561 | return ret; | |
562 | } | |
563 | ||
564 | static int process_connect(struct transport *transport, | |
565 | int for_push) | |
566 | { | |
567 | struct helper_data *data = transport->data; | |
568 | const char *name; | |
569 | const char *exec; | |
570 | ||
571 | name = for_push ? "git-receive-pack" : "git-upload-pack"; | |
572 | if (for_push) | |
573 | exec = data->transport_options.receivepack; | |
574 | else | |
575 | exec = data->transport_options.uploadpack; | |
576 | ||
577 | return process_connect_service(transport, name, exec); | |
578 | } | |
579 | ||
b236752a IL |
580 | static int connect_helper(struct transport *transport, const char *name, |
581 | const char *exec, int fd[2]) | |
582 | { | |
583 | struct helper_data *data = transport->data; | |
584 | ||
585 | /* Get_helper so connect is inited. */ | |
586 | get_helper(transport); | |
587 | if (!data->connect) | |
588 | die("Operation not supported by protocol."); | |
589 | ||
590 | if (!process_connect_service(transport, name, exec)) | |
591 | die("Can't connect to subservice %s.", name); | |
592 | ||
593 | fd[0] = data->helper->out; | |
594 | fd[1] = data->helper->in; | |
595 | return 0; | |
596 | } | |
597 | ||
6eb996b5 | 598 | static int fetch(struct transport *transport, |
37148311 | 599 | int nr_heads, struct ref **to_fetch) |
6eb996b5 DB |
600 | { |
601 | struct helper_data *data = transport->data; | |
602 | int i, count; | |
603 | ||
fa8c097c IL |
604 | if (process_connect(transport, 0)) { |
605 | do_take_over(transport); | |
606 | return transport->fetch(transport, nr_heads, to_fetch); | |
607 | } | |
608 | ||
6eb996b5 DB |
609 | count = 0; |
610 | for (i = 0; i < nr_heads; i++) | |
611 | if (!(to_fetch[i]->status & REF_STATUS_UPTODATE)) | |
612 | count++; | |
613 | ||
614 | if (!count) | |
615 | return 0; | |
616 | ||
aab1beb0 MH |
617 | if (data->check_connectivity && |
618 | data->transport_options.check_self_contained_and_connected) | |
619 | set_helper_option(transport, "check-connectivity", "true"); | |
620 | ||
621 | if (transport->cloning) | |
622 | set_helper_option(transport, "cloning", "true"); | |
623 | ||
624 | if (data->transport_options.update_shallow) | |
625 | set_helper_option(transport, "update-shallow", "true"); | |
626 | ||
6eb996b5 DB |
627 | if (data->fetch) |
628 | return fetch_with_fetch(transport, nr_heads, to_fetch); | |
629 | ||
e65e91ed DB |
630 | if (data->import) |
631 | return fetch_with_import(transport, nr_heads, to_fetch); | |
632 | ||
6eb996b5 DB |
633 | return -1; |
634 | } | |
635 | ||
664059fb | 636 | static int push_update_ref_status(struct strbuf *buf, |
d2e73c6f SR |
637 | struct ref **ref, |
638 | struct ref *remote_refs) | |
639 | { | |
640 | char *refname, *msg; | |
f9e3c6be | 641 | int status, forced = 0; |
d2e73c6f | 642 | |
59556548 | 643 | if (starts_with(buf->buf, "ok ")) { |
d2e73c6f SR |
644 | status = REF_STATUS_OK; |
645 | refname = buf->buf + 3; | |
59556548 | 646 | } else if (starts_with(buf->buf, "error ")) { |
d2e73c6f SR |
647 | status = REF_STATUS_REMOTE_REJECT; |
648 | refname = buf->buf + 6; | |
649 | } else | |
82247e9b | 650 | die("expected ok/error, helper said '%s'", buf->buf); |
d2e73c6f SR |
651 | |
652 | msg = strchr(refname, ' '); | |
653 | if (msg) { | |
654 | struct strbuf msg_buf = STRBUF_INIT; | |
655 | const char *end; | |
656 | ||
657 | *msg++ = '\0'; | |
658 | if (!unquote_c_style(&msg_buf, msg, &end)) | |
659 | msg = strbuf_detach(&msg_buf, NULL); | |
660 | else | |
661 | msg = xstrdup(msg); | |
662 | strbuf_release(&msg_buf); | |
663 | ||
664 | if (!strcmp(msg, "no match")) { | |
665 | status = REF_STATUS_NONE; | |
666 | free(msg); | |
667 | msg = NULL; | |
668 | } | |
669 | else if (!strcmp(msg, "up to date")) { | |
670 | status = REF_STATUS_UPTODATE; | |
671 | free(msg); | |
672 | msg = NULL; | |
673 | } | |
674 | else if (!strcmp(msg, "non-fast forward")) { | |
675 | status = REF_STATUS_REJECT_NONFASTFORWARD; | |
676 | free(msg); | |
677 | msg = NULL; | |
678 | } | |
dbfeddb1 CR |
679 | else if (!strcmp(msg, "already exists")) { |
680 | status = REF_STATUS_REJECT_ALREADY_EXISTS; | |
681 | free(msg); | |
682 | msg = NULL; | |
683 | } | |
75e5c0dc JH |
684 | else if (!strcmp(msg, "fetch first")) { |
685 | status = REF_STATUS_REJECT_FETCH_FIRST; | |
686 | free(msg); | |
687 | msg = NULL; | |
688 | } | |
689 | else if (!strcmp(msg, "needs force")) { | |
690 | status = REF_STATUS_REJECT_NEEDS_FORCE; | |
691 | free(msg); | |
692 | msg = NULL; | |
693 | } | |
631b5ef2 JH |
694 | else if (!strcmp(msg, "stale info")) { |
695 | status = REF_STATUS_REJECT_STALE; | |
696 | free(msg); | |
697 | msg = NULL; | |
698 | } | |
f9e3c6be FC |
699 | else if (!strcmp(msg, "forced update")) { |
700 | forced = 1; | |
701 | free(msg); | |
702 | msg = NULL; | |
703 | } | |
d2e73c6f SR |
704 | } |
705 | ||
706 | if (*ref) | |
707 | *ref = find_ref_by_name(*ref, refname); | |
708 | if (!*ref) | |
709 | *ref = find_ref_by_name(remote_refs, refname); | |
710 | if (!*ref) { | |
711 | warning("helper reported unexpected status of %s", refname); | |
664059fb | 712 | return 1; |
d2e73c6f SR |
713 | } |
714 | ||
715 | if ((*ref)->status != REF_STATUS_NONE) { | |
716 | /* | |
717 | * Earlier, the ref was marked not to be pushed, so ignore the ref | |
718 | * status reported by the remote helper if the latter is 'no match'. | |
719 | */ | |
720 | if (status == REF_STATUS_NONE) | |
664059fb | 721 | return 1; |
d2e73c6f SR |
722 | } |
723 | ||
724 | (*ref)->status = status; | |
cf31f70c | 725 | (*ref)->forced_update |= forced; |
d2e73c6f | 726 | (*ref)->remote_status = msg; |
126aac5c | 727 | return !(status == REF_STATUS_OK); |
d2e73c6f SR |
728 | } |
729 | ||
0551a06c | 730 | static int push_update_refs_status(struct helper_data *data, |
5a75353f FC |
731 | struct ref *remote_refs, |
732 | int flags) | |
d2e73c6f SR |
733 | { |
734 | struct strbuf buf = STRBUF_INIT; | |
735 | struct ref *ref = remote_refs; | |
0551a06c FC |
736 | int ret = 0; |
737 | ||
d2e73c6f | 738 | for (;;) { |
664059fb FC |
739 | char *private; |
740 | ||
0551a06c FC |
741 | if (recvline(data, &buf)) { |
742 | ret = 1; | |
743 | break; | |
744 | } | |
745 | ||
d2e73c6f SR |
746 | if (!buf.len) |
747 | break; | |
748 | ||
664059fb FC |
749 | if (push_update_ref_status(&buf, &ref, remote_refs)) |
750 | continue; | |
751 | ||
5a75353f | 752 | if (flags & TRANSPORT_PUSH_DRY_RUN || !data->refspecs || data->no_private_update) |
664059fb FC |
753 | continue; |
754 | ||
755 | /* propagate back the update to the remote namespace */ | |
756 | private = apply_refspecs(data->refspecs, data->refspec_nr, ref->name); | |
757 | if (!private) | |
758 | continue; | |
759 | update_ref("update by helper", private, ref->new_sha1, NULL, 0, 0); | |
760 | free(private); | |
d2e73c6f SR |
761 | } |
762 | strbuf_release(&buf); | |
0551a06c | 763 | return ret; |
d2e73c6f SR |
764 | } |
765 | ||
30261094 DB |
766 | static void set_common_push_options(struct transport *transport, |
767 | const char *name, int flags) | |
768 | { | |
769 | if (flags & TRANSPORT_PUSH_DRY_RUN) { | |
770 | if (set_helper_option(transport, "dry-run", "true") != 0) | |
771 | die("helper %s does not support dry-run", name); | |
772 | } else if (flags & TRANSPORT_PUSH_CERT_ALWAYS) { | |
773 | if (set_helper_option(transport, TRANS_OPT_PUSH_CERT, "true") != 0) | |
774 | die("helper %s does not support --signed", name); | |
775 | } else if (flags & TRANSPORT_PUSH_CERT_IF_ASKED) { | |
776 | if (set_helper_option(transport, TRANS_OPT_PUSH_CERT, "if-asked") != 0) | |
777 | die("helper %s does not support --signed=if-asked", name); | |
778 | } | |
779 | } | |
780 | ||
73b49a75 | 781 | static int push_refs_with_push(struct transport *transport, |
05c1eb10 | 782 | struct ref *remote_refs, int flags) |
ae4efe19 SP |
783 | { |
784 | int force_all = flags & TRANSPORT_PUSH_FORCE; | |
785 | int mirror = flags & TRANSPORT_PUSH_MIRROR; | |
786 | struct helper_data *data = transport->data; | |
787 | struct strbuf buf = STRBUF_INIT; | |
ae4efe19 | 788 | struct ref *ref; |
05c1eb10 JH |
789 | struct string_list cas_options = STRING_LIST_INIT_DUP; |
790 | struct string_list_item *cas_option; | |
ae4efe19 | 791 | |
c0aa335c | 792 | get_helper(transport); |
ae4efe19 SP |
793 | if (!data->push) |
794 | return 1; | |
795 | ||
796 | for (ref = remote_refs; ref; ref = ref->next) { | |
20e8b465 | 797 | if (!ref->peer_ref && !mirror) |
ae4efe19 SP |
798 | continue; |
799 | ||
20e8b465 TRC |
800 | /* Check for statuses set by set_ref_status_for_push() */ |
801 | switch (ref->status) { | |
802 | case REF_STATUS_REJECT_NONFASTFORWARD: | |
631b5ef2 | 803 | case REF_STATUS_REJECT_STALE: |
dbfeddb1 | 804 | case REF_STATUS_REJECT_ALREADY_EXISTS: |
20e8b465 | 805 | case REF_STATUS_UPTODATE: |
ae4efe19 | 806 | continue; |
20e8b465 TRC |
807 | default: |
808 | ; /* do nothing */ | |
ae4efe19 SP |
809 | } |
810 | ||
811 | if (force_all) | |
812 | ref->force = 1; | |
813 | ||
814 | strbuf_addstr(&buf, "push "); | |
815 | if (!ref->deletion) { | |
816 | if (ref->force) | |
817 | strbuf_addch(&buf, '+'); | |
818 | if (ref->peer_ref) | |
819 | strbuf_addstr(&buf, ref->peer_ref->name); | |
820 | else | |
821 | strbuf_addstr(&buf, sha1_to_hex(ref->new_sha1)); | |
822 | } | |
823 | strbuf_addch(&buf, ':'); | |
824 | strbuf_addstr(&buf, ref->name); | |
825 | strbuf_addch(&buf, '\n'); | |
05c1eb10 JH |
826 | |
827 | /* | |
828 | * The "--force-with-lease" options without explicit | |
829 | * values to expect have already been expanded into | |
830 | * the ref->old_sha1_expect[] field; we can ignore | |
831 | * transport->smart_options->cas altogether and instead | |
832 | * can enumerate them from the refs. | |
833 | */ | |
834 | if (ref->expect_old_sha1) { | |
835 | struct strbuf cas = STRBUF_INIT; | |
836 | strbuf_addf(&cas, "%s:%s", | |
837 | ref->name, sha1_to_hex(ref->old_sha1_expect)); | |
838 | string_list_append(&cas_options, strbuf_detach(&cas, NULL)); | |
839 | } | |
ae4efe19 | 840 | } |
05c1eb10 JH |
841 | if (buf.len == 0) { |
842 | string_list_clear(&cas_options, 0); | |
d8f67d20 | 843 | return 0; |
05c1eb10 | 844 | } |
ae4efe19 | 845 | |
05c1eb10 JH |
846 | for_each_string_list_item(cas_option, &cas_options) |
847 | set_helper_option(transport, "cas", cas_option->string); | |
30261094 | 848 | set_common_push_options(transport, data->name, flags); |
ae4efe19 SP |
849 | |
850 | strbuf_addch(&buf, '\n'); | |
bf3c523c | 851 | sendline(data, &buf); |
ae4efe19 | 852 | strbuf_release(&buf); |
d2e73c6f | 853 | |
0551a06c | 854 | return push_update_refs_status(data, remote_refs, flags); |
ae4efe19 SP |
855 | } |
856 | ||
73b49a75 SR |
857 | static int push_refs_with_export(struct transport *transport, |
858 | struct ref *remote_refs, int flags) | |
859 | { | |
860 | struct ref *ref; | |
861 | struct child_process *helper, exporter; | |
862 | struct helper_data *data = transport->data; | |
d98c8153 | 863 | struct string_list revlist_args = STRING_LIST_INIT_DUP; |
73b49a75 SR |
864 | struct strbuf buf = STRBUF_INIT; |
865 | ||
21610d82 FC |
866 | if (!data->refspecs) |
867 | die("remote-helper doesn't support push; refspec needed"); | |
868 | ||
30261094 | 869 | set_common_push_options(transport, data->name, flags); |
510fa6f5 FC |
870 | if (flags & TRANSPORT_PUSH_FORCE) { |
871 | if (set_helper_option(transport, "force", "true") != 0) | |
872 | warning("helper %s does not support 'force'", data->name); | |
873 | } | |
874 | ||
73b49a75 SR |
875 | helper = get_helper(transport); |
876 | ||
877 | write_constant(helper->in, "export\n"); | |
878 | ||
73b49a75 SR |
879 | for (ref = remote_refs; ref; ref = ref->next) { |
880 | char *private; | |
881 | unsigned char sha1[20]; | |
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 | 891 | if (ref->peer_ref) { |
d98c8153 | 892 | if (strcmp(ref->name, ref->peer_ref->name)) { |
f3d03763 FC |
893 | if (!ref->deletion) { |
894 | const char *name; | |
895 | int flag; | |
896 | ||
897 | /* Follow symbolic refs (mainly for HEAD). */ | |
7695d118 RS |
898 | name = resolve_ref_unsafe( |
899 | ref->peer_ref->name, | |
900 | RESOLVE_REF_READING, | |
901 | sha1, &flag); | |
f3d03763 FC |
902 | if (!name || !(flag & REF_ISSYMREF)) |
903 | name = ref->peer_ref->name; | |
9193f742 | 904 | |
f3d03763 FC |
905 | strbuf_addf(&buf, "%s:%s", name, ref->name); |
906 | } else | |
907 | strbuf_addf(&buf, ":%s", ref->name); | |
9193f742 | 908 | |
d98c8153 FC |
909 | string_list_append(&revlist_args, "--refspec"); |
910 | string_list_append(&revlist_args, buf.buf); | |
911 | strbuf_release(&buf); | |
912 | } | |
f3d03763 FC |
913 | if (!ref->deletion) |
914 | string_list_append(&revlist_args, ref->peer_ref->name); | |
67c9c782 | 915 | } |
73b49a75 SR |
916 | } |
917 | ||
a515ebe9 | 918 | if (get_exporter(transport, &exporter, &revlist_args)) |
73b49a75 SR |
919 | die("Couldn't run fast-export"); |
920 | ||
d98c8153 FC |
921 | string_list_clear(&revlist_args, 1); |
922 | ||
cc567322 SR |
923 | if (finish_command(&exporter)) |
924 | die("Error while running fast-export"); | |
3994e64d FC |
925 | if (push_update_refs_status(data, remote_refs, flags)) |
926 | return 1; | |
927 | ||
928 | if (data->export_marks) { | |
929 | strbuf_addf(&buf, "%s.tmp", data->export_marks); | |
930 | rename(buf.buf, data->export_marks); | |
931 | strbuf_release(&buf); | |
932 | } | |
933 | ||
934 | return 0; | |
73b49a75 SR |
935 | } |
936 | ||
937 | static int push_refs(struct transport *transport, | |
938 | struct ref *remote_refs, int flags) | |
939 | { | |
940 | struct helper_data *data = transport->data; | |
941 | ||
942 | if (process_connect(transport, 1)) { | |
943 | do_take_over(transport); | |
944 | return transport->push_refs(transport, remote_refs, flags); | |
945 | } | |
946 | ||
947 | if (!remote_refs) { | |
948 | fprintf(stderr, "No refs in common and none specified; doing nothing.\n" | |
949 | "Perhaps you should specify a branch such as 'master'.\n"); | |
950 | return 0; | |
951 | } | |
952 | ||
953 | if (data->push) | |
954 | return push_refs_with_push(transport, remote_refs, flags); | |
955 | ||
956 | if (data->export) | |
957 | return push_refs_with_export(transport, remote_refs, flags); | |
958 | ||
959 | return -1; | |
960 | } | |
961 | ||
962 | ||
f8ec9167 DB |
963 | static int has_attribute(const char *attrs, const char *attr) { |
964 | int len; | |
965 | if (!attrs) | |
966 | return 0; | |
967 | ||
968 | len = strlen(attr); | |
969 | for (;;) { | |
970 | const char *space = strchrnul(attrs, ' '); | |
971 | if (len == space - attrs && !strncmp(attrs, attr, len)) | |
972 | return 1; | |
973 | if (!*space) | |
974 | return 0; | |
975 | attrs = space + 1; | |
976 | } | |
977 | } | |
978 | ||
6eb996b5 DB |
979 | static struct ref *get_refs_list(struct transport *transport, int for_push) |
980 | { | |
292ce46b | 981 | struct helper_data *data = transport->data; |
6eb996b5 DB |
982 | struct child_process *helper; |
983 | struct ref *ret = NULL; | |
984 | struct ref **tail = &ret; | |
985 | struct ref *posn; | |
986 | struct strbuf buf = STRBUF_INIT; | |
6eb996b5 DB |
987 | |
988 | helper = get_helper(transport); | |
2d14d65c | 989 | |
fa8c097c IL |
990 | if (process_connect(transport, for_push)) { |
991 | do_take_over(transport); | |
992 | return transport->get_refs_list(transport, for_push); | |
993 | } | |
994 | ||
ae4efe19 SP |
995 | if (data->push && for_push) |
996 | write_str_in_full(helper->in, "list for-push\n"); | |
997 | else | |
998 | write_str_in_full(helper->in, "list\n"); | |
6eb996b5 | 999 | |
6eb996b5 DB |
1000 | while (1) { |
1001 | char *eov, *eon; | |
5931b33e FC |
1002 | if (recvline(data, &buf)) |
1003 | exit(128); | |
6eb996b5 DB |
1004 | |
1005 | if (!*buf.buf) | |
1006 | break; | |
1007 | ||
1008 | eov = strchr(buf.buf, ' '); | |
1009 | if (!eov) | |
1010 | die("Malformed response in ref list: %s", buf.buf); | |
1011 | eon = strchr(eov + 1, ' '); | |
1012 | *eov = '\0'; | |
1013 | if (eon) | |
1014 | *eon = '\0'; | |
1015 | *tail = alloc_ref(eov + 1); | |
1016 | if (buf.buf[0] == '@') | |
1017 | (*tail)->symref = xstrdup(buf.buf + 1); | |
1018 | else if (buf.buf[0] != '?') | |
1019 | get_sha1_hex(buf.buf, (*tail)->old_sha1); | |
f8ec9167 DB |
1020 | if (eon) { |
1021 | if (has_attribute(eon + 1, "unchanged")) { | |
1022 | (*tail)->status |= REF_STATUS_UPTODATE; | |
ae25fd39 SB |
1023 | if (read_ref((*tail)->name, |
1024 | (*tail)->old_sha1) < 0) | |
1025 | die(N_("Could not read ref %s"), | |
1026 | (*tail)->name); | |
f8ec9167 DB |
1027 | } |
1028 | } | |
6eb996b5 DB |
1029 | tail = &((*tail)->next); |
1030 | } | |
bf3c523c IL |
1031 | if (debug) |
1032 | fprintf(stderr, "Debug: Read ref listing.\n"); | |
6eb996b5 DB |
1033 | strbuf_release(&buf); |
1034 | ||
1035 | for (posn = ret; posn; posn = posn->next) | |
1036 | resolve_remote_symref(posn, ret); | |
1037 | ||
1038 | return ret; | |
1039 | } | |
1040 | ||
c9e388bb | 1041 | int transport_helper_init(struct transport *transport, const char *name) |
6eb996b5 | 1042 | { |
92e25b6b | 1043 | struct helper_data *data = xcalloc(1, sizeof(*data)); |
c9e388bb | 1044 | data->name = name; |
6eb996b5 | 1045 | |
a5adaced JK |
1046 | transport_check_allowed(name); |
1047 | ||
bf3c523c IL |
1048 | if (getenv("GIT_TRANSPORT_HELPER_DEBUG")) |
1049 | debug = 1; | |
1050 | ||
6eb996b5 | 1051 | transport->data = data; |
ef08ef9e | 1052 | transport->set_option = set_helper_option; |
6eb996b5 DB |
1053 | transport->get_refs_list = get_refs_list; |
1054 | transport->fetch = fetch; | |
ae4efe19 | 1055 | transport->push_refs = push_refs; |
f2a37151 | 1056 | transport->disconnect = release_helper; |
b236752a | 1057 | transport->connect = connect_helper; |
61b075bd | 1058 | transport->smart_options = &(data->transport_options); |
6eb996b5 DB |
1059 | return 0; |
1060 | } | |
419f37db IL |
1061 | |
1062 | /* | |
1063 | * Linux pipes can buffer 65536 bytes at once (and most platforms can | |
1064 | * buffer less), so attempt reads and writes with up to that size. | |
1065 | */ | |
1066 | #define BUFFERSIZE 65536 | |
1067 | /* This should be enough to hold debugging message. */ | |
1068 | #define PBUFFERSIZE 8192 | |
1069 | ||
1070 | /* Print bidirectional transfer loop debug message. */ | |
4621085b | 1071 | __attribute__((format (printf, 1, 2))) |
419f37db IL |
1072 | static void transfer_debug(const char *fmt, ...) |
1073 | { | |
1074 | va_list args; | |
1075 | char msgbuf[PBUFFERSIZE]; | |
1076 | static int debug_enabled = -1; | |
1077 | ||
1078 | if (debug_enabled < 0) | |
1079 | debug_enabled = getenv("GIT_TRANSLOOP_DEBUG") ? 1 : 0; | |
1080 | if (!debug_enabled) | |
1081 | return; | |
1082 | ||
1083 | va_start(args, fmt); | |
1084 | vsnprintf(msgbuf, PBUFFERSIZE, fmt, args); | |
1085 | va_end(args); | |
1086 | fprintf(stderr, "Transfer loop debugging: %s\n", msgbuf); | |
1087 | } | |
1088 | ||
1089 | /* Stream state: More data may be coming in this direction. */ | |
1090 | #define SSTATE_TRANSFERING 0 | |
1091 | /* | |
1092 | * Stream state: No more data coming in this direction, flushing rest of | |
1093 | * data. | |
1094 | */ | |
1095 | #define SSTATE_FLUSHING 1 | |
1096 | /* Stream state: Transfer in this direction finished. */ | |
1097 | #define SSTATE_FINISHED 2 | |
1098 | ||
1099 | #define STATE_NEEDS_READING(state) ((state) <= SSTATE_TRANSFERING) | |
1100 | #define STATE_NEEDS_WRITING(state) ((state) <= SSTATE_FLUSHING) | |
1101 | #define STATE_NEEDS_CLOSING(state) ((state) == SSTATE_FLUSHING) | |
1102 | ||
1103 | /* Unidirectional transfer. */ | |
1104 | struct unidirectional_transfer { | |
1105 | /* Source */ | |
1106 | int src; | |
1107 | /* Destination */ | |
1108 | int dest; | |
1109 | /* Is source socket? */ | |
1110 | int src_is_sock; | |
1111 | /* Is destination socket? */ | |
1112 | int dest_is_sock; | |
41ccfdd9 | 1113 | /* Transfer state (TRANSFERRING/FLUSHING/FINISHED) */ |
419f37db IL |
1114 | int state; |
1115 | /* Buffer. */ | |
1116 | char buf[BUFFERSIZE]; | |
1117 | /* Buffer used. */ | |
1118 | size_t bufuse; | |
1119 | /* Name of source. */ | |
1120 | const char *src_name; | |
1121 | /* Name of destination. */ | |
1122 | const char *dest_name; | |
1123 | }; | |
1124 | ||
1125 | /* Closes the target (for writing) if transfer has finished. */ | |
1126 | static void udt_close_if_finished(struct unidirectional_transfer *t) | |
1127 | { | |
1128 | if (STATE_NEEDS_CLOSING(t->state) && !t->bufuse) { | |
1129 | t->state = SSTATE_FINISHED; | |
1130 | if (t->dest_is_sock) | |
1131 | shutdown(t->dest, SHUT_WR); | |
1132 | else | |
1133 | close(t->dest); | |
1134 | transfer_debug("Closed %s.", t->dest_name); | |
1135 | } | |
1136 | } | |
1137 | ||
1138 | /* | |
1139 | * Tries to read read data from source into buffer. If buffer is full, | |
1140 | * no data is read. Returns 0 on success, -1 on error. | |
1141 | */ | |
1142 | static int udt_do_read(struct unidirectional_transfer *t) | |
1143 | { | |
1144 | ssize_t bytes; | |
1145 | ||
1146 | if (t->bufuse == BUFFERSIZE) | |
1147 | return 0; /* No space for more. */ | |
1148 | ||
1149 | transfer_debug("%s is readable", t->src_name); | |
1150 | bytes = read(t->src, t->buf + t->bufuse, BUFFERSIZE - t->bufuse); | |
1151 | if (bytes < 0 && errno != EWOULDBLOCK && errno != EAGAIN && | |
1152 | errno != EINTR) { | |
1153 | error("read(%s) failed: %s", t->src_name, strerror(errno)); | |
1154 | return -1; | |
1155 | } else if (bytes == 0) { | |
1156 | transfer_debug("%s EOF (with %i bytes in buffer)", | |
4621085b | 1157 | t->src_name, (int)t->bufuse); |
419f37db IL |
1158 | t->state = SSTATE_FLUSHING; |
1159 | } else if (bytes > 0) { | |
1160 | t->bufuse += bytes; | |
1161 | transfer_debug("Read %i bytes from %s (buffer now at %i)", | |
1162 | (int)bytes, t->src_name, (int)t->bufuse); | |
1163 | } | |
1164 | return 0; | |
1165 | } | |
1166 | ||
1167 | /* Tries to write data from buffer into destination. If buffer is empty, | |
1168 | * no data is written. Returns 0 on success, -1 on error. | |
1169 | */ | |
1170 | static int udt_do_write(struct unidirectional_transfer *t) | |
1171 | { | |
803dbdb9 | 1172 | ssize_t bytes; |
419f37db IL |
1173 | |
1174 | if (t->bufuse == 0) | |
1175 | return 0; /* Nothing to write. */ | |
1176 | ||
1177 | transfer_debug("%s is writable", t->dest_name); | |
7edc02f4 EFL |
1178 | bytes = xwrite(t->dest, t->buf, t->bufuse); |
1179 | if (bytes < 0 && errno != EWOULDBLOCK) { | |
419f37db IL |
1180 | error("write(%s) failed: %s", t->dest_name, strerror(errno)); |
1181 | return -1; | |
1182 | } else if (bytes > 0) { | |
1183 | t->bufuse -= bytes; | |
1184 | if (t->bufuse) | |
1185 | memmove(t->buf, t->buf + bytes, t->bufuse); | |
1186 | transfer_debug("Wrote %i bytes to %s (buffer now at %i)", | |
1187 | (int)bytes, t->dest_name, (int)t->bufuse); | |
1188 | } | |
1189 | return 0; | |
1190 | } | |
1191 | ||
1192 | ||
1193 | /* State of bidirectional transfer loop. */ | |
1194 | struct bidirectional_transfer_state { | |
1195 | /* Direction from program to git. */ | |
1196 | struct unidirectional_transfer ptg; | |
1197 | /* Direction from git to program. */ | |
1198 | struct unidirectional_transfer gtp; | |
1199 | }; | |
1200 | ||
1201 | static void *udt_copy_task_routine(void *udt) | |
1202 | { | |
1203 | struct unidirectional_transfer *t = (struct unidirectional_transfer *)udt; | |
1204 | while (t->state != SSTATE_FINISHED) { | |
1205 | if (STATE_NEEDS_READING(t->state)) | |
1206 | if (udt_do_read(t)) | |
1207 | return NULL; | |
1208 | if (STATE_NEEDS_WRITING(t->state)) | |
1209 | if (udt_do_write(t)) | |
1210 | return NULL; | |
1211 | if (STATE_NEEDS_CLOSING(t->state)) | |
1212 | udt_close_if_finished(t); | |
1213 | } | |
1214 | return udt; /* Just some non-NULL value. */ | |
1215 | } | |
1216 | ||
1217 | #ifndef NO_PTHREADS | |
1218 | ||
1219 | /* | |
98e023de | 1220 | * Join thread, with appropriate errors on failure. Name is name for the |
419f37db IL |
1221 | * thread (for error messages). Returns 0 on success, 1 on failure. |
1222 | */ | |
1223 | static int tloop_join(pthread_t thread, const char *name) | |
1224 | { | |
1225 | int err; | |
1226 | void *tret; | |
1227 | err = pthread_join(thread, &tret); | |
1228 | if (!tret) { | |
1229 | error("%s thread failed", name); | |
1230 | return 1; | |
1231 | } | |
1232 | if (err) { | |
1233 | error("%s thread failed to join: %s", name, strerror(err)); | |
1234 | return 1; | |
1235 | } | |
1236 | return 0; | |
1237 | } | |
1238 | ||
1239 | /* | |
1240 | * Spawn the transfer tasks and then wait for them. Returns 0 on success, | |
1241 | * -1 on failure. | |
1242 | */ | |
1243 | static int tloop_spawnwait_tasks(struct bidirectional_transfer_state *s) | |
1244 | { | |
1245 | pthread_t gtp_thread; | |
1246 | pthread_t ptg_thread; | |
1247 | int err; | |
1248 | int ret = 0; | |
1249 | err = pthread_create(>p_thread, NULL, udt_copy_task_routine, | |
1250 | &s->gtp); | |
1251 | if (err) | |
1252 | die("Can't start thread for copying data: %s", strerror(err)); | |
1253 | err = pthread_create(&ptg_thread, NULL, udt_copy_task_routine, | |
1254 | &s->ptg); | |
1255 | if (err) | |
1256 | die("Can't start thread for copying data: %s", strerror(err)); | |
1257 | ||
1258 | ret |= tloop_join(gtp_thread, "Git to program copy"); | |
1259 | ret |= tloop_join(ptg_thread, "Program to git copy"); | |
1260 | return ret; | |
1261 | } | |
1262 | #else | |
1263 | ||
1264 | /* Close the source and target (for writing) for transfer. */ | |
1265 | static void udt_kill_transfer(struct unidirectional_transfer *t) | |
1266 | { | |
1267 | t->state = SSTATE_FINISHED; | |
1268 | /* | |
1269 | * Socket read end left open isn't a disaster if nobody | |
1270 | * attempts to read from it (mingw compat headers do not | |
1271 | * have SHUT_RD)... | |
1272 | * | |
1273 | * We can't fully close the socket since otherwise gtp | |
1274 | * task would first close the socket it sends data to | |
1275 | * while closing the ptg file descriptors. | |
1276 | */ | |
1277 | if (!t->src_is_sock) | |
1278 | close(t->src); | |
1279 | if (t->dest_is_sock) | |
1280 | shutdown(t->dest, SHUT_WR); | |
1281 | else | |
1282 | close(t->dest); | |
1283 | } | |
1284 | ||
1285 | /* | |
98e023de | 1286 | * Join process, with appropriate errors on failure. Name is name for the |
419f37db IL |
1287 | * process (for error messages). Returns 0 on success, 1 on failure. |
1288 | */ | |
1289 | static int tloop_join(pid_t pid, const char *name) | |
1290 | { | |
1291 | int tret; | |
1292 | if (waitpid(pid, &tret, 0) < 0) { | |
1293 | error("%s process failed to wait: %s", name, strerror(errno)); | |
1294 | return 1; | |
1295 | } | |
1296 | if (!WIFEXITED(tret) || WEXITSTATUS(tret)) { | |
1297 | error("%s process failed", name); | |
1298 | return 1; | |
1299 | } | |
1300 | return 0; | |
1301 | } | |
1302 | ||
1303 | /* | |
1304 | * Spawn the transfer tasks and then wait for them. Returns 0 on success, | |
1305 | * -1 on failure. | |
1306 | */ | |
1307 | static int tloop_spawnwait_tasks(struct bidirectional_transfer_state *s) | |
1308 | { | |
1309 | pid_t pid1, pid2; | |
1310 | int ret = 0; | |
1311 | ||
1312 | /* Fork thread #1: git to program. */ | |
1313 | pid1 = fork(); | |
1314 | if (pid1 < 0) | |
1315 | die_errno("Can't start thread for copying data"); | |
1316 | else if (pid1 == 0) { | |
1317 | udt_kill_transfer(&s->ptg); | |
1318 | exit(udt_copy_task_routine(&s->gtp) ? 0 : 1); | |
1319 | } | |
1320 | ||
1321 | /* Fork thread #2: program to git. */ | |
1322 | pid2 = fork(); | |
1323 | if (pid2 < 0) | |
1324 | die_errno("Can't start thread for copying data"); | |
1325 | else if (pid2 == 0) { | |
1326 | udt_kill_transfer(&s->gtp); | |
1327 | exit(udt_copy_task_routine(&s->ptg) ? 0 : 1); | |
1328 | } | |
1329 | ||
1330 | /* | |
1331 | * Close both streams in parent as to not interfere with | |
1332 | * end of file detection and wait for both tasks to finish. | |
1333 | */ | |
1334 | udt_kill_transfer(&s->gtp); | |
1335 | udt_kill_transfer(&s->ptg); | |
1336 | ret |= tloop_join(pid1, "Git to program copy"); | |
1337 | ret |= tloop_join(pid2, "Program to git copy"); | |
1338 | return ret; | |
1339 | } | |
1340 | #endif | |
1341 | ||
1342 | /* | |
1343 | * Copies data from stdin to output and from input to stdout simultaneously. | |
1344 | * Additionally filtering through given filter. If filter is NULL, uses | |
1345 | * identity filter. | |
1346 | */ | |
1347 | int bidirectional_transfer_loop(int input, int output) | |
1348 | { | |
1349 | struct bidirectional_transfer_state state; | |
1350 | ||
1351 | /* Fill the state fields. */ | |
1352 | state.ptg.src = input; | |
1353 | state.ptg.dest = 1; | |
1354 | state.ptg.src_is_sock = (input == output); | |
1355 | state.ptg.dest_is_sock = 0; | |
1356 | state.ptg.state = SSTATE_TRANSFERING; | |
1357 | state.ptg.bufuse = 0; | |
1358 | state.ptg.src_name = "remote input"; | |
1359 | state.ptg.dest_name = "stdout"; | |
1360 | ||
1361 | state.gtp.src = 0; | |
1362 | state.gtp.dest = output; | |
1363 | state.gtp.src_is_sock = 0; | |
1364 | state.gtp.dest_is_sock = (input == output); | |
1365 | state.gtp.state = SSTATE_TRANSFERING; | |
1366 | state.gtp.bufuse = 0; | |
1367 | state.gtp.src_name = "stdin"; | |
1368 | state.gtp.dest_name = "remote output"; | |
1369 | ||
1370 | return tloop_spawnwait_tasks(&state); | |
1371 | } |