#include "cache.h" #include "config.h" #include "remote.h" #include "connect.h" #include "strbuf.h" #include "walker.h" #include "http.h" #include "exec-cmd.h" #include "run-command.h" #include "pkt-line.h" #include "string-list.h" #include "sideband.h" #include "argv-array.h" #include "credential.h" #include "sha1-array.h" #include "send-pack.h" #include "protocol.h" #include "quote.h" static struct remote *remote; /* always ends with a trailing slash */ static struct strbuf url = STRBUF_INIT; struct options { int verbosity; unsigned long depth; char *deepen_since; struct string_list deepen_not; struct string_list push_options; char *filter; unsigned progress : 1, check_self_contained_and_connected : 1, cloning : 1, update_shallow : 1, followtags : 1, dry_run : 1, thin : 1, /* One of the SEND_PACK_PUSH_CERT_* constants. */ push_cert : 2, deepen_relative : 1, from_promisor : 1, no_dependents : 1; }; static struct options options; static struct string_list cas_options = STRING_LIST_INIT_DUP; static int set_option(const char *name, const char *value) { if (!strcmp(name, "verbosity")) { char *end; int v = strtol(value, &end, 10); if (value == end || *end) return -1; options.verbosity = v; return 0; } else if (!strcmp(name, "progress")) { if (!strcmp(value, "true")) options.progress = 1; else if (!strcmp(value, "false")) options.progress = 0; else return -1; return 0; } else if (!strcmp(name, "depth")) { char *end; unsigned long v = strtoul(value, &end, 10); if (value == end || *end) return -1; options.depth = v; return 0; } else if (!strcmp(name, "deepen-since")) { options.deepen_since = xstrdup(value); return 0; } else if (!strcmp(name, "deepen-not")) { string_list_append(&options.deepen_not, value); return 0; } else if (!strcmp(name, "deepen-relative")) { if (!strcmp(value, "true")) options.deepen_relative = 1; else if (!strcmp(value, "false")) options.deepen_relative = 0; else return -1; return 0; } else if (!strcmp(name, "followtags")) { if (!strcmp(value, "true")) options.followtags = 1; else if (!strcmp(value, "false")) options.followtags = 0; else return -1; return 0; } else if (!strcmp(name, "dry-run")) { if (!strcmp(value, "true")) options.dry_run = 1; else if (!strcmp(value, "false")) options.dry_run = 0; else return -1; return 0; } else if (!strcmp(name, "check-connectivity")) { if (!strcmp(value, "true")) options.check_self_contained_and_connected = 1; else if (!strcmp(value, "false")) options.check_self_contained_and_connected = 0; else return -1; return 0; } else if (!strcmp(name, "cas")) { struct strbuf val = STRBUF_INIT; strbuf_addf(&val, "--" CAS_OPT_NAME "=%s", value); string_list_append(&cas_options, val.buf); strbuf_release(&val); return 0; } else if (!strcmp(name, "cloning")) { if (!strcmp(value, "true")) options.cloning = 1; else if (!strcmp(value, "false")) options.cloning = 0; else return -1; return 0; } else if (!strcmp(name, "update-shallow")) { if (!strcmp(value, "true")) options.update_shallow = 1; else if (!strcmp(value, "false")) options.update_shallow = 0; else return -1; return 0; } else if (!strcmp(name, "pushcert")) { if (!strcmp(value, "true")) options.push_cert = SEND_PACK_PUSH_CERT_ALWAYS; else if (!strcmp(value, "false")) options.push_cert = SEND_PACK_PUSH_CERT_NEVER; else if (!strcmp(value, "if-asked")) options.push_cert = SEND_PACK_PUSH_CERT_IF_ASKED; else return -1; return 0; } else if (!strcmp(name, "push-option")) { if (*value != '"') string_list_append(&options.push_options, value); else { struct strbuf unquoted = STRBUF_INIT; if (unquote_c_style(&unquoted, value, NULL) < 0) die("invalid quoting in push-option value"); string_list_append_nodup(&options.push_options, strbuf_detach(&unquoted, NULL)); } return 0; #if LIBCURL_VERSION_NUM >= 0x070a08 } else if (!strcmp(name, "family")) { if (!strcmp(value, "ipv4")) git_curl_ipresolve = CURL_IPRESOLVE_V4; else if (!strcmp(value, "ipv6")) git_curl_ipresolve = CURL_IPRESOLVE_V6; else if (!strcmp(value, "all")) git_curl_ipresolve = CURL_IPRESOLVE_WHATEVER; else return -1; return 0; #endif /* LIBCURL_VERSION_NUM >= 0x070a08 */ } else if (!strcmp(name, "from-promisor")) { options.from_promisor = 1; return 0; } else if (!strcmp(name, "no-dependents")) { options.no_dependents = 1; return 0; } else if (!strcmp(name, "filter")) { options.filter = xstrdup(value);; return 0; } else { return 1 /* unsupported */; } } struct discovery { char *service; char *buf_alloc; char *buf; size_t len; struct ref *refs; struct oid_array shallow; enum protocol_version version; unsigned proto_git : 1; }; static struct discovery *last_discovery; static struct ref *parse_git_refs(struct discovery *heads, int for_push) { struct ref *list = NULL; struct packet_reader reader; packet_reader_init(&reader, -1, heads->buf, heads->len, PACKET_READ_CHOMP_NEWLINE | PACKET_READ_GENTLE_ON_EOF); heads->version = discover_version(&reader); switch (heads->version) { case protocol_v2: /* * Do nothing. This isn't a list of refs but rather a * capability advertisement. Client would have run * 'stateless-connect' so we'll dump this capability listing * and let them request the refs themselves. */ break; case protocol_v1: case protocol_v0: get_remote_heads(&reader, &list, for_push ? REF_NORMAL : 0, NULL, &heads->shallow); break; case protocol_unknown_version: BUG("unknown protocol version"); } return list; } static struct ref *parse_info_refs(struct discovery *heads) { char *data, *start, *mid; char *ref_name; int i = 0; struct ref *refs = NULL; struct ref *ref = NULL; struct ref *last_ref = NULL; data = heads->buf; start = NULL; mid = data; while (i < heads->len) { if (!start) { start = &data[i]; } if (data[i] == '\t') mid = &data[i]; if (data[i] == '\n') { if (mid - start != 40) die("%sinfo/refs not valid: is this a git repository?", url.buf); data[i] = 0; ref_name = mid + 1; ref = alloc_ref(ref_name); get_oid_hex(start, &ref->old_oid); if (!refs) refs = ref; if (last_ref) last_ref->next = ref; last_ref = ref; start = NULL; } i++; } ref = alloc_ref("HEAD"); if (!http_fetch_ref(url.buf, ref) && !resolve_remote_symref(ref, refs)) { ref->next = refs; refs = ref; } else { free(ref); } return refs; } static void free_discovery(struct discovery *d) { if (d) { if (d == last_discovery) last_discovery = NULL; free(d->shallow.oid); free(d->buf_alloc); free_refs(d->refs); free(d->service); free(d); } } static int show_http_message(struct strbuf *type, struct strbuf *charset, struct strbuf *msg) { const char *p, *eol; /* * We only show text/plain parts, as other types are likely * to be ugly to look at on the user's terminal. */ if (strcmp(type->buf, "text/plain")) return -1; if (charset->len) strbuf_reencode(msg, charset->buf, get_log_output_encoding()); strbuf_trim(msg); if (!msg->len) return -1; p = msg->buf; do { eol = strchrnul(p, '\n'); fprintf(stderr, "remote: %.*s\n", (int)(eol - p), p); p = eol + 1; } while(*eol); return 0; } static int get_protocol_http_header(enum protocol_version version, struct strbuf *header) { if (version > 0) { strbuf_addf(header, GIT_PROTOCOL_HEADER ": version=%d", version); return 1; } return 0; } static struct discovery *discover_refs(const char *service, int for_push) { struct strbuf exp = STRBUF_INIT; struct strbuf type = STRBUF_INIT; struct strbuf charset = STRBUF_INIT; struct strbuf buffer = STRBUF_INIT; struct strbuf refs_url = STRBUF_INIT; struct strbuf effective_url = STRBUF_INIT; struct strbuf protocol_header = STRBUF_INIT; struct string_list extra_headers = STRING_LIST_INIT_DUP; struct discovery *last = last_discovery; int http_ret, maybe_smart = 0; struct http_get_options http_options; enum protocol_version version = get_protocol_version_config(); if (last && !strcmp(service, last->service)) return last; free_discovery(last); strbuf_addf(&refs_url, "%sinfo/refs", url.buf); if ((starts_with(url.buf, "http://") || starts_with(url.buf, "https://")) && git_env_bool("GIT_SMART_HTTP", 1)) { maybe_smart = 1; if (!strchr(url.buf, '?')) strbuf_addch(&refs_url, '?'); else strbuf_addch(&refs_url, '&'); strbuf_addf(&refs_url, "service=%s", service); } /* * NEEDSWORK: If we are trying to use protocol v2 and we are planning * to perform a push, then fallback to v0 since the client doesn't know * how to push yet using v2. */ if (version == protocol_v2 && !strcmp("git-receive-pack", service)) version = protocol_v0; /* Add the extra Git-Protocol header */ if (get_protocol_http_header(version, &protocol_header)) string_list_append(&extra_headers, protocol_header.buf); memset(&http_options, 0, sizeof(http_options)); http_options.content_type = &type; http_options.charset = &charset; http_options.effective_url = &effective_url; http_options.base_url = &url; http_options.extra_headers = &extra_headers; http_options.initial_request = 1; http_options.no_cache = 1; http_options.keep_error = 1; http_ret = http_get_strbuf(refs_url.buf, &buffer, &http_options); switch (http_ret) { case HTTP_OK: break; case HTTP_MISSING_TARGET: show_http_message(&type, &charset, &buffer); die("repository '%s' not found", url.buf); case HTTP_NOAUTH: show_http_message(&type, &charset, &buffer); die("Authentication failed for '%s'", url.buf); default: show_http_message(&type, &charset, &buffer); die("unable to access '%s': %s", url.buf, curl_errorstr); } if (options.verbosity && !starts_with(refs_url.buf, url.buf)) warning(_("redirecting to %s"), url.buf); last= xcalloc(1, sizeof(*last_discovery)); last->service = xstrdup(service); last->buf_alloc = strbuf_detach(&buffer, &last->len); last->buf = last->buf_alloc; strbuf_addf(&exp, "application/x-%s-advertisement", service); if (maybe_smart && (5 <= last->len && last->buf[4] == '#') && !strbuf_cmp(&exp, &type)) { char *line; /* * smart HTTP response; validate that the service * pkt-line matches our request. */ line = packet_read_line_buf(&last->buf, &last->len, NULL); if (!line) die("invalid server response; expected service, got flush packet"); strbuf_reset(&exp); strbuf_addf(&exp, "# service=%s", service); if (strcmp(line, exp.buf)) die("invalid server response; got '%s'", line); strbuf_release(&exp); /* The header can include additional metadata lines, up * until a packet flush marker. Ignore these now, but * in the future we might start to scan them. */ while (packet_read_line_buf(&last->buf, &last->len, NULL)) ; last->proto_git = 1; } else if (maybe_smart && last->len > 5 && starts_with(last->buf + 4, "version 2")) { last->proto_git = 1; } if (last->proto_git) last->refs = parse_git_refs(last, for_push); else last->refs = parse_info_refs(last); strbuf_release(&refs_url); strbuf_release(&exp); strbuf_release(&type); strbuf_release(&charset); strbuf_release(&effective_url); strbuf_release(&buffer); strbuf_release(&protocol_header); string_list_clear(&extra_headers, 0); last_discovery = last; return last; } static struct ref *get_refs(int for_push) { struct discovery *heads; if (for_push) heads = discover_refs("git-receive-pack", for_push); else heads = discover_refs("git-upload-pack", for_push); return heads->refs; } static void output_refs(struct ref *refs) { struct ref *posn; for (posn = refs; posn; posn = posn->next) { if (posn->symref) printf("@%s %s\n", posn->symref, posn->name); else printf("%s %s\n", oid_to_hex(&posn->old_oid), posn->name); } printf("\n"); fflush(stdout); } struct rpc_state { const char *service_name; const char **argv; struct strbuf *stdin_preamble; char *service_url; char *hdr_content_type; char *hdr_accept; char *protocol_header; char *buf; size_t alloc; size_t len; size_t pos; int in; int out; int any_written; struct strbuf result; unsigned gzip_request : 1; unsigned initial_buffer : 1; }; static size_t rpc_out(void *ptr, size_t eltsize, size_t nmemb, void *buffer_) { size_t max = eltsize * nmemb; struct rpc_state *rpc = buffer_; size_t avail = rpc->len - rpc->pos; if (!avail) { rpc->initial_buffer = 0; avail = packet_read(rpc->out, NULL, NULL, rpc->buf, rpc->alloc, 0); if (!avail) return 0; rpc->pos = 0; rpc->len = avail; } if (max < avail) avail = max; memcpy(ptr, rpc->buf + rpc->pos, avail); rpc->pos += avail; return avail; } #ifndef NO_CURL_IOCTL static curlioerr rpc_ioctl(CURL *handle, int cmd, void *clientp) { struct rpc_state *rpc = clientp; switch (cmd) { case CURLIOCMD_NOP: return CURLIOE_OK; case CURLIOCMD_RESTARTREAD: if (rpc->initial_buffer) { rpc->pos = 0; return CURLIOE_OK; } error("unable to rewind rpc post data - try increasing http.postBuffer"); return CURLIOE_FAILRESTART; default: return CURLIOE_UNKNOWNCMD; } } #endif static size_t rpc_in(char *ptr, size_t eltsize, size_t nmemb, void *buffer_) { size_t size = eltsize * nmemb; struct rpc_state *rpc = buffer_; if (size) rpc->any_written = 1; write_or_die(rpc->in, ptr, size); return size; } static int run_slot(struct active_request_slot *slot, struct slot_results *results) { int err; struct slot_results results_buf; if (!results) results = &results_buf; err = run_one_slot(slot, results); if (err != HTTP_OK && err != HTTP_REAUTH) { struct strbuf msg = STRBUF_INIT; if (results->http_code && results->http_code != 200) strbuf_addf(&msg, "HTTP %ld", results->http_code); if (results->curl_result != CURLE_OK) { if (msg.len) strbuf_addch(&msg, ' '); strbuf_addf(&msg, "curl %d", results->curl_result); if (curl_errorstr[0]) { strbuf_addch(&msg, ' '); strbuf_addstr(&msg, curl_errorstr); } } error("RPC failed; %s", msg.buf); strbuf_release(&msg); } return err; } static int probe_rpc(struct rpc_state *rpc, struct slot_results *results) { struct active_request_slot *slot; struct curl_slist *headers = http_copy_default_headers(); struct strbuf buf = STRBUF_INIT; int err; slot = get_active_slot(); headers = curl_slist_append(headers, rpc->hdr_content_type); headers = curl_slist_append(headers, rpc->hdr_accept); curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0); curl_easy_setopt(slot->curl, CURLOPT_POST, 1); curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url); curl_easy_setopt(slot->curl, CURLOPT_ENCODING, NULL); curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, "0000"); curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, 4); curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers); curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer); curl_easy_setopt(slot->curl, CURLOPT_FILE, &buf); err = run_slot(slot, results); curl_slist_free_all(headers); strbuf_release(&buf); return err; } static curl_off_t xcurl_off_t(ssize_t len) { if (len > maximum_signed_value_of_type(curl_off_t)) die("cannot handle pushes this big"); return (curl_off_t) len; } static int post_rpc(struct rpc_state *rpc) { struct active_request_slot *slot; struct curl_slist *headers = http_copy_default_headers(); int use_gzip = rpc->gzip_request; char *gzip_body = NULL; size_t gzip_size = 0; int err, large_request = 0; int needs_100_continue = 0; /* Try to load the entire request, if we can fit it into the * allocated buffer space we can use HTTP/1.0 and avoid the * chunked encoding mess. */ while (1) { size_t left = rpc->alloc - rpc->len; char *buf = rpc->buf + rpc->len; int n; if (left < LARGE_PACKET_MAX) { large_request = 1; use_gzip = 0; break; } n = packet_read(rpc->out, NULL, NULL, buf, left, 0); if (!n) break; rpc->len += n; } if (large_request) { struct slot_results results; do { err = probe_rpc(rpc, &results); if (err == HTTP_REAUTH) credential_fill(&http_auth); } while (err == HTTP_REAUTH); if (err != HTTP_OK) return -1; if (results.auth_avail & CURLAUTH_GSSNEGOTIATE) needs_100_continue = 1; } headers = curl_slist_append(headers, rpc->hdr_content_type); headers = curl_slist_append(headers, rpc->hdr_accept); headers = curl_slist_append(headers, needs_100_continue ? "Expect: 100-continue" : "Expect:"); /* Add the extra Git-Protocol header */ if (rpc->protocol_header) headers = curl_slist_append(headers, rpc->protocol_header); retry: slot = get_active_slot(); curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0); curl_easy_setopt(slot->curl, CURLOPT_POST, 1); curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url); curl_easy_setopt(slot->curl, CURLOPT_ENCODING, ""); if (large_request) { /* The request body is large and the size cannot be predicted. * We must use chunked encoding to send it. */ headers = curl_slist_append(headers, "Transfer-Encoding: chunked"); rpc->initial_buffer = 1; curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, rpc_out); curl_easy_setopt(slot->curl, CURLOPT_INFILE, rpc); #ifndef NO_CURL_IOCTL curl_easy_setopt(slot->curl, CURLOPT_IOCTLFUNCTION, rpc_ioctl); curl_easy_setopt(slot->curl, CURLOPT_IOCTLDATA, rpc); #endif if (options.verbosity > 1) { fprintf(stderr, "POST %s (chunked)\n", rpc->service_name); fflush(stderr); } } else if (gzip_body) { /* * If we are looping to retry authentication, then the previous * run will have set up the headers and gzip buffer already, * and we just need to send it. */ curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body); curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE_LARGE, xcurl_off_t(gzip_size)); } else if (use_gzip && 1024 < rpc->len) { /* The client backend isn't giving us compressed data so * we can try to deflate it ourselves, this may save on. * the transfer time. */ git_zstream stream; int ret; git_deflate_init_gzip(&stream, Z_BEST_COMPRESSION); gzip_size = git_deflate_bound(&stream, rpc->len); gzip_body = xmalloc(gzip_size); stream.next_in = (unsigned char *)rpc->buf; stream.avail_in = rpc->len; stream.next_out = (unsigned char *)gzip_body; stream.avail_out = gzip_size; ret = git_deflate(&stream, Z_FINISH); if (ret != Z_STREAM_END) die("cannot deflate request; zlib deflate error %d", ret); ret = git_deflate_end_gently(&stream); if (ret != Z_OK) die("cannot deflate request; zlib end error %d", ret); gzip_size = stream.total_out; headers = curl_slist_append(headers, "Content-Encoding: gzip"); curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body); curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE_LARGE, xcurl_off_t(gzip_size)); if (options.verbosity > 1) { fprintf(stderr, "POST %s (gzip %lu to %lu bytes)\n", rpc->service_name, (unsigned long)rpc->len, (unsigned long)gzip_size); fflush(stderr); } } else { /* We know the complete request size in advance, use the * more normal Content-Length approach. */ curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, rpc->buf); curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE_LARGE, xcurl_off_t(rpc->len)); if (options.verbosity > 1) { fprintf(stderr, "POST %s (%lu bytes)\n", rpc->service_name, (unsigned long)rpc->len); fflush(stderr); } } curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers); curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, rpc_in); curl_easy_setopt(slot->curl, CURLOPT_FILE, rpc); rpc->any_written = 0; err = run_slot(slot, NULL); if (err == HTTP_REAUTH && !large_request) { credential_fill(&http_auth); goto retry; } if (err != HTTP_OK) err = -1; if (!rpc->any_written) err = -1; curl_slist_free_all(headers); free(gzip_body); return err; } static int rpc_service(struct rpc_state *rpc, struct discovery *heads) { const char *svc = rpc->service_name; struct strbuf buf = STRBUF_INIT; struct strbuf *preamble = rpc->stdin_preamble; struct child_process client = CHILD_PROCESS_INIT; int err = 0; client.in = -1; client.out = -1; client.git_cmd = 1; client.argv = rpc->argv; if (start_command(&client)) exit(1); if (preamble) write_or_die(client.in, preamble->buf, preamble->len); if (heads) write_or_die(client.in, heads->buf, heads->len); rpc->alloc = http_post_buffer; rpc->buf = xmalloc(rpc->alloc); rpc->in = client.in; rpc->out = client.out; strbuf_init(&rpc->result, 0); strbuf_addf(&buf, "%s%s", url.buf, svc); rpc->service_url = strbuf_detach(&buf, NULL); strbuf_addf(&buf, "Content-Type: application/x-%s-request", svc); rpc->hdr_content_type = strbuf_detach(&buf, NULL); strbuf_addf(&buf, "Accept: application/x-%s-result", svc); rpc->hdr_accept = strbuf_detach(&buf, NULL); if (get_protocol_http_header(heads->version, &buf)) rpc->protocol_header = strbuf_detach(&buf, NULL); else rpc->protocol_header = NULL; while (!err) { int n = packet_read(rpc->out, NULL, NULL, rpc->buf, rpc->alloc, 0); if (!n) break; rpc->pos = 0; rpc->len = n; err |= post_rpc(rpc); } close(client.in); client.in = -1; if (!err) { strbuf_read(&rpc->result, client.out, 0); } else { char buf[4096]; for (;;) if (xread(client.out, buf, sizeof(buf)) <= 0) break; } close(client.out); client.out = -1; err |= finish_command(&client); free(rpc->service_url); free(rpc->hdr_content_type); free(rpc->hdr_accept); free(rpc->protocol_header); free(rpc->buf); strbuf_release(&buf); return err; } static int fetch_dumb(int nr_heads, struct ref **to_fetch) { struct walker *walker; char **targets; int ret, i; ALLOC_ARRAY(targets, nr_heads); if (options.depth || options.deepen_since) die("dumb http transport does not support shallow capabilities"); for (i = 0; i < nr_heads; i++) targets[i] = xstrdup(oid_to_hex(&to_fetch[i]->old_oid)); walker = get_http_walker(url.buf); walker->get_verbosely = options.verbosity >= 3; walker->get_recover = 0; ret = walker_fetch(walker, nr_heads, targets, NULL, NULL); walker_free(walker); for (i = 0; i < nr_heads; i++) free(targets[i]); free(targets); return ret ? error("fetch failed.") : 0; } static int fetch_git(struct discovery *heads, int nr_heads, struct ref **to_fetch) { struct rpc_state rpc; struct strbuf preamble = STRBUF_INIT; int i, err; struct argv_array args = ARGV_ARRAY_INIT; argv_array_pushl(&args, "fetch-pack", "--stateless-rpc", "--stdin", "--lock-pack", NULL); if (options.followtags) argv_array_push(&args, "--include-tag"); if (options.thin) argv_array_push(&args, "--thin"); if (options.verbosity >= 3) argv_array_pushl(&args, "-v", "-v", NULL); if (options.check_self_contained_and_connected) argv_array_push(&args, "--check-self-contained-and-connected"); if (options.cloning) argv_array_push(&args, "--cloning"); if (options.update_shallow) argv_array_push(&args, "--update-shallow"); if (!options.progress) argv_array_push(&args, "--no-progress"); if (options.depth) argv_array_pushf(&args, "--depth=%lu", options.depth); if (options.deepen_since) argv_array_pushf(&args, "--shallow-since=%s", options.deepen_since); for (i = 0; i < options.deepen_not.nr; i++) argv_array_pushf(&args, "--shallow-exclude=%s", options.deepen_not.items[i].string); if (options.deepen_relative && options.depth) argv_array_push(&args, "--deepen-relative"); if (options.from_promisor) argv_array_push(&args, "--from-promisor"); if (options.no_dependents) argv_array_push(&args, "--no-dependents"); if (options.filter) argv_array_pushf(&args, "--filter=%s", options.filter); argv_array_push(&args, url.buf); for (i = 0; i < nr_heads; i++) { struct ref *ref = to_fetch[i]; if (!*ref->name) die("cannot fetch by sha1 over smart http"); packet_buf_write(&preamble, "%s %s\n", oid_to_hex(&ref->old_oid), ref->name); } packet_buf_flush(&preamble); memset(&rpc, 0, sizeof(rpc)); rpc.service_name = "git-upload-pack", rpc.argv = args.argv; rpc.stdin_preamble = &preamble; rpc.gzip_request = 1; err = rpc_service(&rpc, heads); if (rpc.result.len) write_or_die(1, rpc.result.buf, rpc.result.len); strbuf_release(&rpc.result); strbuf_release(&preamble); argv_array_clear(&args); return err; } static int fetch(int nr_heads, struct ref **to_fetch) { struct discovery *d = discover_refs("git-upload-pack", 0); if (d->proto_git) return fetch_git(d, nr_heads, to_fetch); else return fetch_dumb(nr_heads, to_fetch); } static void parse_fetch(struct strbuf *buf) { struct ref **to_fetch = NULL; struct ref *list_head = NULL; struct ref **list = &list_head; int alloc_heads = 0, nr_heads = 0; do { const char *p; if (skip_prefix(buf->buf, "fetch ", &p)) { const char *name; struct ref *ref; struct object_id old_oid; if (get_oid_hex(p, &old_oid)) die("protocol error: expected sha/ref, got %s'", p); if (p[GIT_SHA1_HEXSZ] == ' ') name = p + GIT_SHA1_HEXSZ + 1; else if (!p[GIT_SHA1_HEXSZ]) name = ""; else die("protocol error: expected sha/ref, got %s'", p); ref = alloc_ref(name); oidcpy(&ref->old_oid, &old_oid); *list = ref; list = &ref->next; ALLOC_GROW(to_fetch, nr_heads + 1, alloc_heads); to_fetch[nr_heads++] = ref; } else die("http transport does not support %s", buf->buf); strbuf_reset(buf); if (strbuf_getline_lf(buf, stdin) == EOF) return; if (!*buf->buf) break; } while (1); if (fetch(nr_heads, to_fetch)) exit(128); /* error already reported */ free_refs(list_head); free(to_fetch); printf("\n"); fflush(stdout); strbuf_reset(buf); } static int push_dav(int nr_spec, char **specs) { struct child_process child = CHILD_PROCESS_INIT; size_t i; child.git_cmd = 1; argv_array_push(&child.args, "http-push"); argv_array_push(&child.args, "--helper-status"); if (options.dry_run) argv_array_push(&child.args, "--dry-run"); if (options.verbosity > 1) argv_array_push(&child.args, "--verbose"); argv_array_push(&child.args, url.buf); for (i = 0; i < nr_spec; i++) argv_array_push(&child.args, specs[i]); if (run_command(&child)) die("git-http-push failed"); return 0; } static int push_git(struct discovery *heads, int nr_spec, char **specs) { struct rpc_state rpc; int i, err; struct argv_array args; struct string_list_item *cas_option; struct strbuf preamble = STRBUF_INIT; argv_array_init(&args); argv_array_pushl(&args, "send-pack", "--stateless-rpc", "--helper-status", NULL); if (options.thin) argv_array_push(&args, "--thin"); if (options.dry_run) argv_array_push(&args, "--dry-run"); if (options.push_cert == SEND_PACK_PUSH_CERT_ALWAYS) argv_array_push(&args, "--signed=yes"); else if (options.push_cert == SEND_PACK_PUSH_CERT_IF_ASKED) argv_array_push(&args, "--signed=if-asked"); if (options.verbosity == 0) argv_array_push(&args, "--quiet"); else if (options.verbosity > 1) argv_array_push(&args, "--verbose"); for (i = 0; i < options.push_options.nr; i++) argv_array_pushf(&args, "--push-option=%s", options.push_options.items[i].string); argv_array_push(&args, options.progress ? "--progress" : "--no-progress"); for_each_string_list_item(cas_option, &cas_options) argv_array_push(&args, cas_option->string); argv_array_push(&args, url.buf); argv_array_push(&args, "--stdin"); for (i = 0; i < nr_spec; i++) packet_buf_write(&preamble, "%s\n", specs[i]); packet_buf_flush(&preamble); memset(&rpc, 0, sizeof(rpc)); rpc.service_name = "git-receive-pack", rpc.argv = args.argv; rpc.stdin_preamble = &preamble; err = rpc_service(&rpc, heads); if (rpc.result.len) write_or_die(1, rpc.result.buf, rpc.result.len); strbuf_release(&rpc.result); strbuf_release(&preamble); argv_array_clear(&args); return err; } static int push(int nr_spec, char **specs) { struct discovery *heads = discover_refs("git-receive-pack", 1); int ret; if (heads->proto_git) ret = push_git(heads, nr_spec, specs); else ret = push_dav(nr_spec, specs); free_discovery(heads); return ret; } static void parse_push(struct strbuf *buf) { char **specs = NULL; int alloc_spec = 0, nr_spec = 0, i, ret; do { if (starts_with(buf->buf, "push ")) { ALLOC_GROW(specs, nr_spec + 1, alloc_spec); specs[nr_spec++] = xstrdup(buf->buf + 5); } else die("http transport does not support %s", buf->buf); strbuf_reset(buf); if (strbuf_getline_lf(buf, stdin) == EOF) goto free_specs; if (!*buf->buf) break; } while (1); ret = push(nr_spec, specs); printf("\n"); fflush(stdout); if (ret) exit(128); /* error already reported */ free_specs: for (i = 0; i < nr_spec; i++) free(specs[i]); free(specs); } /* * Used to represent the state of a connection to an HTTP server when * communicating using git's wire-protocol version 2. */ struct proxy_state { char *service_name; char *service_url; struct curl_slist *headers; struct strbuf request_buffer; int in; int out; struct packet_reader reader; size_t pos; int seen_flush; }; static void proxy_state_init(struct proxy_state *p, const char *service_name, enum protocol_version version) { struct strbuf buf = STRBUF_INIT; memset(p, 0, sizeof(*p)); p->service_name = xstrdup(service_name); p->in = 0; p->out = 1; strbuf_init(&p->request_buffer, 0); strbuf_addf(&buf, "%s%s", url.buf, p->service_name); p->service_url = strbuf_detach(&buf, NULL); p->headers = http_copy_default_headers(); strbuf_addf(&buf, "Content-Type: application/x-%s-request", p->service_name); p->headers = curl_slist_append(p->headers, buf.buf); strbuf_reset(&buf); strbuf_addf(&buf, "Accept: application/x-%s-result", p->service_name); p->headers = curl_slist_append(p->headers, buf.buf); strbuf_reset(&buf); p->headers = curl_slist_append(p->headers, "Transfer-Encoding: chunked"); /* Add the Git-Protocol header */ if (get_protocol_http_header(version, &buf)) p->headers = curl_slist_append(p->headers, buf.buf); packet_reader_init(&p->reader, p->in, NULL, 0, PACKET_READ_GENTLE_ON_EOF); strbuf_release(&buf); } static void proxy_state_clear(struct proxy_state *p) { free(p->service_name); free(p->service_url); curl_slist_free_all(p->headers); strbuf_release(&p->request_buffer); } /* * CURLOPT_READFUNCTION callback function. * Attempts to copy over a single packet-line at a time into the * curl provided buffer. */ static size_t proxy_in(char *buffer, size_t eltsize, size_t nmemb, void *userdata) { size_t max; struct proxy_state *p = userdata; size_t avail = p->request_buffer.len - p->pos; if (eltsize != 1) BUG("curl read callback called with size = %"PRIuMAX" != 1", (uintmax_t)eltsize); max = nmemb; if (!avail) { if (p->seen_flush) { p->seen_flush = 0; return 0; } strbuf_reset(&p->request_buffer); switch (packet_reader_read(&p->reader)) { case PACKET_READ_EOF: die("unexpected EOF when reading from parent process"); case PACKET_READ_NORMAL: packet_buf_write_len(&p->request_buffer, p->reader.line, p->reader.pktlen); break; case PACKET_READ_DELIM: packet_buf_delim(&p->request_buffer); break; case PACKET_READ_FLUSH: packet_buf_flush(&p->request_buffer); p->seen_flush = 1; break; } p->pos = 0; avail = p->request_buffer.len; } if (max < avail) avail = max; memcpy(buffer, p->request_buffer.buf + p->pos, avail); p->pos += avail; return avail; } static size_t proxy_out(char *buffer, size_t eltsize, size_t nmemb, void *userdata) { size_t size; struct proxy_state *p = userdata; if (eltsize != 1) BUG("curl read callback called with size = %"PRIuMAX" != 1", (uintmax_t)eltsize); size = nmemb; write_or_die(p->out, buffer, size); return size; } /* Issues a request to the HTTP server configured in `p` */ static int proxy_request(struct proxy_state *p) { struct active_request_slot *slot; slot = get_active_slot(); curl_easy_setopt(slot->curl, CURLOPT_ENCODING, ""); curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0); curl_easy_setopt(slot->curl, CURLOPT_POST, 1); curl_easy_setopt(slot->curl, CURLOPT_URL, p->service_url); curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, p->headers); /* Setup function to read request from client */ curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, proxy_in); curl_easy_setopt(slot->curl, CURLOPT_READDATA, p); /* Setup function to write server response to client */ curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, proxy_out); curl_easy_setopt(slot->curl, CURLOPT_WRITEDATA, p); if (run_slot(slot, NULL) != HTTP_OK) return -1; return 0; } static int stateless_connect(const char *service_name) { struct discovery *discover; struct proxy_state p; /* * Run the info/refs request and see if the server supports protocol * v2. If and only if the server supports v2 can we successfully * establish a stateless connection, otherwise we need to tell the * client to fallback to using other transport helper functions to * complete their request. */ discover = discover_refs(service_name, 0); if (discover->version != protocol_v2) { printf("fallback\n"); fflush(stdout); return -1; } else { /* Stateless Connection established */ printf("\n"); fflush(stdout); } proxy_state_init(&p, service_name, discover->version); /* * Dump the capability listing that we got from the server earlier * during the info/refs request. */ write_or_die(p.out, discover->buf, discover->len); /* Peek the next packet line. Until we see EOF keep sending POSTs */ while (packet_reader_peek(&p.reader) != PACKET_READ_EOF) { if (proxy_request(&p)) { /* We would have an err here */ break; } } proxy_state_clear(&p); return 0; } int cmd_main(int argc, const char **argv) { struct strbuf buf = STRBUF_INIT; int nongit; setup_git_directory_gently(&nongit); if (argc < 2) { error("remote-curl: usage: git remote-curl <remote> [<url>]"); return 1; } options.verbosity = 1; options.progress = !!isatty(2); options.thin = 1; string_list_init(&options.deepen_not, 1); string_list_init(&options.push_options, 1); remote = remote_get(argv[1]); if (argc > 2) { end_url_with_slash(&url, argv[2]); } else { end_url_with_slash(&url, remote->url[0]); } http_init(remote, url.buf, 0); do { const char *arg; if (strbuf_getline_lf(&buf, stdin) == EOF) { if (ferror(stdin)) error("remote-curl: error reading command stream from git"); return 1; } if (buf.len == 0) break; if (starts_with(buf.buf, "fetch ")) { if (nongit) die("remote-curl: fetch attempted without a local repo"); parse_fetch(&buf); } else if (!strcmp(buf.buf, "list") || starts_with(buf.buf, "list ")) { int for_push = !!strstr(buf.buf + 4, "for-push"); output_refs(get_refs(for_push)); } else if (starts_with(buf.buf, "push ")) { parse_push(&buf); } else if (skip_prefix(buf.buf, "option ", &arg)) { char *value = strchr(arg, ' '); int result; if (value) *value++ = '\0'; else value = "true"; result = set_option(arg, value); if (!result) printf("ok\n"); else if (result < 0) printf("error invalid value\n"); else printf("unsupported\n"); fflush(stdout); } else if (!strcmp(buf.buf, "capabilities")) { printf("stateless-connect\n"); printf("fetch\n"); printf("option\n"); printf("push\n"); printf("check-connectivity\n"); printf("\n"); fflush(stdout); } else if (skip_prefix(buf.buf, "stateless-connect ", &arg)) { if (!stateless_connect(arg)) break; } else { error("remote-curl: unknown command '%s' from git", buf.buf); return 1; } strbuf_reset(&buf); } while (1); http_cleanup(); return 0; }