git: treat "git -C '<path>'" as a no-op when <path> is empty
[git.git] / http-backend.c
blobb6c0484fb24de853ac205233e4e07d2e4e94ed75
1 #include "cache.h"
2 #include "refs.h"
3 #include "pkt-line.h"
4 #include "object.h"
5 #include "tag.h"
6 #include "exec_cmd.h"
7 #include "run-command.h"
8 #include "string-list.h"
9 #include "url.h"
10 #include "argv-array.h"
12 static const char content_type[] = "Content-Type";
13 static const char content_length[] = "Content-Length";
14 static const char last_modified[] = "Last-Modified";
15 static int getanyfile = 1;
17 static struct string_list *query_params;
19 struct rpc_service {
20 const char *name;
21 const char *config_name;
22 signed enabled : 2;
25 static struct rpc_service rpc_service[] = {
26 { "upload-pack", "uploadpack", 1 },
27 { "receive-pack", "receivepack", -1 },
30 static struct string_list *get_parameters(void)
32 if (!query_params) {
33 const char *query = getenv("QUERY_STRING");
35 query_params = xcalloc(1, sizeof(*query_params));
36 while (query && *query) {
37 char *name = url_decode_parameter_name(&query);
38 char *value = url_decode_parameter_value(&query);
39 struct string_list_item *i;
41 i = string_list_lookup(query_params, name);
42 if (!i)
43 i = string_list_insert(query_params, name);
44 else
45 free(i->util);
46 i->util = value;
49 return query_params;
52 static const char *get_parameter(const char *name)
54 struct string_list_item *i;
55 i = string_list_lookup(get_parameters(), name);
56 return i ? i->util : NULL;
59 __attribute__((format (printf, 2, 3)))
60 static void format_write(int fd, const char *fmt, ...)
62 static char buffer[1024];
64 va_list args;
65 unsigned n;
67 va_start(args, fmt);
68 n = vsnprintf(buffer, sizeof(buffer), fmt, args);
69 va_end(args);
70 if (n >= sizeof(buffer))
71 die("protocol error: impossibly long line");
73 write_or_die(fd, buffer, n);
76 static void http_status(unsigned code, const char *msg)
78 format_write(1, "Status: %u %s\r\n", code, msg);
81 static void hdr_str(const char *name, const char *value)
83 format_write(1, "%s: %s\r\n", name, value);
86 static void hdr_int(const char *name, uintmax_t value)
88 format_write(1, "%s: %" PRIuMAX "\r\n", name, value);
91 static void hdr_date(const char *name, unsigned long when)
93 const char *value = show_date(when, 0, DATE_RFC2822);
94 hdr_str(name, value);
97 static void hdr_nocache(void)
99 hdr_str("Expires", "Fri, 01 Jan 1980 00:00:00 GMT");
100 hdr_str("Pragma", "no-cache");
101 hdr_str("Cache-Control", "no-cache, max-age=0, must-revalidate");
104 static void hdr_cache_forever(void)
106 unsigned long now = time(NULL);
107 hdr_date("Date", now);
108 hdr_date("Expires", now + 31536000);
109 hdr_str("Cache-Control", "public, max-age=31536000");
112 static void end_headers(void)
114 write_or_die(1, "\r\n", 2);
117 __attribute__((format (printf, 1, 2)))
118 static NORETURN void not_found(const char *err, ...)
120 va_list params;
122 http_status(404, "Not Found");
123 hdr_nocache();
124 end_headers();
126 va_start(params, err);
127 if (err && *err)
128 vfprintf(stderr, err, params);
129 va_end(params);
130 exit(0);
133 __attribute__((format (printf, 1, 2)))
134 static NORETURN void forbidden(const char *err, ...)
136 va_list params;
138 http_status(403, "Forbidden");
139 hdr_nocache();
140 end_headers();
142 va_start(params, err);
143 if (err && *err)
144 vfprintf(stderr, err, params);
145 va_end(params);
146 exit(0);
149 static void select_getanyfile(void)
151 if (!getanyfile)
152 forbidden("Unsupported service: getanyfile");
155 static void send_strbuf(const char *type, struct strbuf *buf)
157 hdr_int(content_length, buf->len);
158 hdr_str(content_type, type);
159 end_headers();
160 write_or_die(1, buf->buf, buf->len);
163 static void send_local_file(const char *the_type, const char *name)
165 const char *p = git_path("%s", name);
166 size_t buf_alloc = 8192;
167 char *buf = xmalloc(buf_alloc);
168 int fd;
169 struct stat sb;
171 fd = open(p, O_RDONLY);
172 if (fd < 0)
173 not_found("Cannot open '%s': %s", p, strerror(errno));
174 if (fstat(fd, &sb) < 0)
175 die_errno("Cannot stat '%s'", p);
177 hdr_int(content_length, sb.st_size);
178 hdr_str(content_type, the_type);
179 hdr_date(last_modified, sb.st_mtime);
180 end_headers();
182 for (;;) {
183 ssize_t n = xread(fd, buf, buf_alloc);
184 if (n < 0)
185 die_errno("Cannot read '%s'", p);
186 if (!n)
187 break;
188 write_or_die(1, buf, n);
190 close(fd);
191 free(buf);
194 static void get_text_file(char *name)
196 select_getanyfile();
197 hdr_nocache();
198 send_local_file("text/plain", name);
201 static void get_loose_object(char *name)
203 select_getanyfile();
204 hdr_cache_forever();
205 send_local_file("application/x-git-loose-object", name);
208 static void get_pack_file(char *name)
210 select_getanyfile();
211 hdr_cache_forever();
212 send_local_file("application/x-git-packed-objects", name);
215 static void get_idx_file(char *name)
217 select_getanyfile();
218 hdr_cache_forever();
219 send_local_file("application/x-git-packed-objects-toc", name);
222 static void http_config(void)
224 int i, value = 0;
225 struct strbuf var = STRBUF_INIT;
227 git_config_get_bool("http.getanyfile", &getanyfile);
229 for (i = 0; i < ARRAY_SIZE(rpc_service); i++) {
230 struct rpc_service *svc = &rpc_service[i];
231 strbuf_addf(&var, "http.%s", svc->config_name);
232 if (!git_config_get_bool(var.buf, &value))
233 svc->enabled = value;
234 strbuf_reset(&var);
237 strbuf_release(&var);
240 static struct rpc_service *select_service(const char *name)
242 const char *svc_name;
243 struct rpc_service *svc = NULL;
244 int i;
246 if (!skip_prefix(name, "git-", &svc_name))
247 forbidden("Unsupported service: '%s'", name);
249 for (i = 0; i < ARRAY_SIZE(rpc_service); i++) {
250 struct rpc_service *s = &rpc_service[i];
251 if (!strcmp(s->name, svc_name)) {
252 svc = s;
253 break;
257 if (!svc)
258 forbidden("Unsupported service: '%s'", name);
260 if (svc->enabled < 0) {
261 const char *user = getenv("REMOTE_USER");
262 svc->enabled = (user && *user) ? 1 : 0;
264 if (!svc->enabled)
265 forbidden("Service not enabled: '%s'", svc->name);
266 return svc;
269 static void inflate_request(const char *prog_name, int out)
271 git_zstream stream;
272 unsigned char in_buf[8192];
273 unsigned char out_buf[8192];
274 unsigned long cnt = 0;
276 memset(&stream, 0, sizeof(stream));
277 git_inflate_init_gzip_only(&stream);
279 while (1) {
280 ssize_t n = xread(0, in_buf, sizeof(in_buf));
281 if (n <= 0)
282 die("request ended in the middle of the gzip stream");
284 stream.next_in = in_buf;
285 stream.avail_in = n;
287 while (0 < stream.avail_in) {
288 int ret;
290 stream.next_out = out_buf;
291 stream.avail_out = sizeof(out_buf);
293 ret = git_inflate(&stream, Z_NO_FLUSH);
294 if (ret != Z_OK && ret != Z_STREAM_END)
295 die("zlib error inflating request, result %d", ret);
297 n = stream.total_out - cnt;
298 if (write_in_full(out, out_buf, n) != n)
299 die("%s aborted reading request", prog_name);
300 cnt += n;
302 if (ret == Z_STREAM_END)
303 goto done;
307 done:
308 git_inflate_end(&stream);
309 close(out);
312 static void run_service(const char **argv)
314 const char *encoding = getenv("HTTP_CONTENT_ENCODING");
315 const char *user = getenv("REMOTE_USER");
316 const char *host = getenv("REMOTE_ADDR");
317 int gzipped_request = 0;
318 struct child_process cld = CHILD_PROCESS_INIT;
320 if (encoding && !strcmp(encoding, "gzip"))
321 gzipped_request = 1;
322 else if (encoding && !strcmp(encoding, "x-gzip"))
323 gzipped_request = 1;
325 if (!user || !*user)
326 user = "anonymous";
327 if (!host || !*host)
328 host = "(none)";
330 if (!getenv("GIT_COMMITTER_NAME"))
331 argv_array_pushf(&cld.env_array, "GIT_COMMITTER_NAME=%s", user);
332 if (!getenv("GIT_COMMITTER_EMAIL"))
333 argv_array_pushf(&cld.env_array,
334 "GIT_COMMITTER_EMAIL=%s@http.%s", user, host);
336 cld.argv = argv;
337 if (gzipped_request)
338 cld.in = -1;
339 cld.git_cmd = 1;
340 if (start_command(&cld))
341 exit(1);
343 close(1);
344 if (gzipped_request)
345 inflate_request(argv[0], cld.in);
346 else
347 close(0);
349 if (finish_command(&cld))
350 exit(1);
353 static int show_text_ref(const char *name, const unsigned char *sha1,
354 int flag, void *cb_data)
356 const char *name_nons = strip_namespace(name);
357 struct strbuf *buf = cb_data;
358 struct object *o = parse_object(sha1);
359 if (!o)
360 return 0;
362 strbuf_addf(buf, "%s\t%s\n", sha1_to_hex(sha1), name_nons);
363 if (o->type == OBJ_TAG) {
364 o = deref_tag(o, name, 0);
365 if (!o)
366 return 0;
367 strbuf_addf(buf, "%s\t%s^{}\n", sha1_to_hex(o->sha1),
368 name_nons);
370 return 0;
373 static void get_info_refs(char *arg)
375 const char *service_name = get_parameter("service");
376 struct strbuf buf = STRBUF_INIT;
378 hdr_nocache();
380 if (service_name) {
381 const char *argv[] = {NULL /* service name */,
382 "--stateless-rpc", "--advertise-refs",
383 ".", NULL};
384 struct rpc_service *svc = select_service(service_name);
386 strbuf_addf(&buf, "application/x-git-%s-advertisement",
387 svc->name);
388 hdr_str(content_type, buf.buf);
389 end_headers();
391 packet_write(1, "# service=git-%s\n", svc->name);
392 packet_flush(1);
394 argv[0] = svc->name;
395 run_service(argv);
397 } else {
398 select_getanyfile();
399 for_each_namespaced_ref(show_text_ref, &buf);
400 send_strbuf("text/plain", &buf);
402 strbuf_release(&buf);
405 static int show_head_ref(const char *refname, const unsigned char *sha1,
406 int flag, void *cb_data)
408 struct strbuf *buf = cb_data;
410 if (flag & REF_ISSYMREF) {
411 unsigned char unused[20];
412 const char *target = resolve_ref_unsafe(refname,
413 RESOLVE_REF_READING,
414 unused, NULL);
415 const char *target_nons = strip_namespace(target);
417 strbuf_addf(buf, "ref: %s\n", target_nons);
418 } else {
419 strbuf_addf(buf, "%s\n", sha1_to_hex(sha1));
422 return 0;
425 static void get_head(char *arg)
427 struct strbuf buf = STRBUF_INIT;
429 select_getanyfile();
430 head_ref_namespaced(show_head_ref, &buf);
431 send_strbuf("text/plain", &buf);
432 strbuf_release(&buf);
435 static void get_info_packs(char *arg)
437 size_t objdirlen = strlen(get_object_directory());
438 struct strbuf buf = STRBUF_INIT;
439 struct packed_git *p;
440 size_t cnt = 0;
442 select_getanyfile();
443 prepare_packed_git();
444 for (p = packed_git; p; p = p->next) {
445 if (p->pack_local)
446 cnt++;
449 strbuf_grow(&buf, cnt * 53 + 2);
450 for (p = packed_git; p; p = p->next) {
451 if (p->pack_local)
452 strbuf_addf(&buf, "P %s\n", p->pack_name + objdirlen + 6);
454 strbuf_addch(&buf, '\n');
456 hdr_nocache();
457 send_strbuf("text/plain; charset=utf-8", &buf);
458 strbuf_release(&buf);
461 static void check_content_type(const char *accepted_type)
463 const char *actual_type = getenv("CONTENT_TYPE");
465 if (!actual_type)
466 actual_type = "";
468 if (strcmp(actual_type, accepted_type)) {
469 http_status(415, "Unsupported Media Type");
470 hdr_nocache();
471 end_headers();
472 format_write(1,
473 "Expected POST with Content-Type '%s',"
474 " but received '%s' instead.\n",
475 accepted_type, actual_type);
476 exit(0);
480 static void service_rpc(char *service_name)
482 const char *argv[] = {NULL, "--stateless-rpc", ".", NULL};
483 struct rpc_service *svc = select_service(service_name);
484 struct strbuf buf = STRBUF_INIT;
486 strbuf_reset(&buf);
487 strbuf_addf(&buf, "application/x-git-%s-request", svc->name);
488 check_content_type(buf.buf);
490 hdr_nocache();
492 strbuf_reset(&buf);
493 strbuf_addf(&buf, "application/x-git-%s-result", svc->name);
494 hdr_str(content_type, buf.buf);
496 end_headers();
498 argv[0] = svc->name;
499 run_service(argv);
500 strbuf_release(&buf);
503 static NORETURN void die_webcgi(const char *err, va_list params)
505 static int dead;
507 if (!dead) {
508 dead = 1;
509 http_status(500, "Internal Server Error");
510 hdr_nocache();
511 end_headers();
513 vreportf("fatal: ", err, params);
515 exit(0); /* we successfully reported a failure ;-) */
518 static char* getdir(void)
520 struct strbuf buf = STRBUF_INIT;
521 char *pathinfo = getenv("PATH_INFO");
522 char *root = getenv("GIT_PROJECT_ROOT");
523 char *path = getenv("PATH_TRANSLATED");
525 if (root && *root) {
526 if (!pathinfo || !*pathinfo)
527 die("GIT_PROJECT_ROOT is set but PATH_INFO is not");
528 if (daemon_avoid_alias(pathinfo))
529 die("'%s': aliased", pathinfo);
530 end_url_with_slash(&buf, root);
531 if (pathinfo[0] == '/')
532 pathinfo++;
533 strbuf_addstr(&buf, pathinfo);
534 return strbuf_detach(&buf, NULL);
535 } else if (path && *path) {
536 return xstrdup(path);
537 } else
538 die("No GIT_PROJECT_ROOT or PATH_TRANSLATED from server");
539 return NULL;
542 static struct service_cmd {
543 const char *method;
544 const char *pattern;
545 void (*imp)(char *);
546 } services[] = {
547 {"GET", "/HEAD$", get_head},
548 {"GET", "/info/refs$", get_info_refs},
549 {"GET", "/objects/info/alternates$", get_text_file},
550 {"GET", "/objects/info/http-alternates$", get_text_file},
551 {"GET", "/objects/info/packs$", get_info_packs},
552 {"GET", "/objects/[0-9a-f]{2}/[0-9a-f]{38}$", get_loose_object},
553 {"GET", "/objects/pack/pack-[0-9a-f]{40}\\.pack$", get_pack_file},
554 {"GET", "/objects/pack/pack-[0-9a-f]{40}\\.idx$", get_idx_file},
556 {"POST", "/git-upload-pack$", service_rpc},
557 {"POST", "/git-receive-pack$", service_rpc}
560 int main(int argc, char **argv)
562 char *method = getenv("REQUEST_METHOD");
563 char *dir;
564 struct service_cmd *cmd = NULL;
565 char *cmd_arg = NULL;
566 int i;
568 git_setup_gettext();
570 git_extract_argv0_path(argv[0]);
571 set_die_routine(die_webcgi);
573 if (!method)
574 die("No REQUEST_METHOD from server");
575 if (!strcmp(method, "HEAD"))
576 method = "GET";
577 dir = getdir();
579 for (i = 0; i < ARRAY_SIZE(services); i++) {
580 struct service_cmd *c = &services[i];
581 regex_t re;
582 regmatch_t out[1];
584 if (regcomp(&re, c->pattern, REG_EXTENDED))
585 die("Bogus regex in service table: %s", c->pattern);
586 if (!regexec(&re, dir, 1, out, 0)) {
587 size_t n;
589 if (strcmp(method, c->method)) {
590 const char *proto = getenv("SERVER_PROTOCOL");
591 if (proto && !strcmp(proto, "HTTP/1.1")) {
592 http_status(405, "Method Not Allowed");
593 hdr_str("Allow", !strcmp(c->method, "GET") ?
594 "GET, HEAD" : c->method);
595 } else
596 http_status(400, "Bad Request");
597 hdr_nocache();
598 end_headers();
599 return 0;
602 cmd = c;
603 n = out[0].rm_eo - out[0].rm_so;
604 cmd_arg = xmemdupz(dir + out[0].rm_so + 1, n - 1);
605 dir[out[0].rm_so] = 0;
606 break;
608 regfree(&re);
611 if (!cmd)
612 not_found("Request not supported: '%s'", dir);
614 setup_path();
615 if (!enter_repo(dir, 0))
616 not_found("Not a git repository: '%s'", dir);
617 if (!getenv("GIT_HTTP_EXPORT_ALL") &&
618 access("git-daemon-export-ok", F_OK) )
619 not_found("Repository not exported: '%s'", dir);
621 http_config();
622 cmd->imp(cmd_arg);
623 return 0;