diff options
Diffstat (limited to 'remote-curl.c')
| -rw-r--r-- | remote-curl.c | 815 |
1 files changed, 815 insertions, 0 deletions
diff --git a/remote-curl.c b/remote-curl.c new file mode 100644 index 0000000000..a331bae6c8 --- /dev/null +++ b/remote-curl.c @@ -0,0 +1,815 @@ +#include "cache.h" +#include "remote.h" +#include "strbuf.h" +#include "walker.h" +#include "http.h" +#include "exec_cmd.h" +#include "run-command.h" +#include "pkt-line.h" +#include "sideband.h" + +static struct remote *remote; +static const char *url; +static struct walker *walker; + +struct options { + int verbosity; + unsigned long depth; + unsigned progress : 1, + followtags : 1, + dry_run : 1, + thin : 1; +}; +static struct options options; + +static void init_walker(void) +{ + if (!walker) + walker = get_http_walker(url, remote); +} + +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, "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 { + return 1 /* unsupported */; + } +} + +struct discovery { + const char *service; + char *buf_alloc; + char *buf; + size_t len; + unsigned proto_git : 1; +}; +static struct discovery *last_discovery; + +static void free_discovery(struct discovery *d) +{ + if (d) { + if (d == last_discovery) + last_discovery = NULL; + free(d->buf_alloc); + free(d); + } +} + +static struct discovery* discover_refs(const char *service) +{ + struct strbuf buffer = STRBUF_INIT; + struct discovery *last = last_discovery; + char *refs_url; + int http_ret, is_http = 0; + + if (last && !strcmp(service, last->service)) + return last; + free_discovery(last); + + strbuf_addf(&buffer, "%s/info/refs", url); + if (!prefixcmp(url, "http://") || !prefixcmp(url, "https://")) { + is_http = 1; + if (!strchr(url, '?')) + strbuf_addch(&buffer, '?'); + else + strbuf_addch(&buffer, '&'); + strbuf_addf(&buffer, "service=%s", service); + } + refs_url = strbuf_detach(&buffer, NULL); + + init_walker(); + http_ret = http_get_strbuf(refs_url, &buffer, HTTP_NO_CACHE); + switch (http_ret) { + case HTTP_OK: + break; + case HTTP_MISSING_TARGET: + die("%s not found: did you run git update-server-info on the" + " server?", refs_url); + default: + http_error(refs_url, http_ret); + die("HTTP request failed"); + } + + last= xcalloc(1, sizeof(*last_discovery)); + last->service = service; + last->buf_alloc = strbuf_detach(&buffer, &last->len); + last->buf = last->buf_alloc; + + if (is_http && 5 <= last->len && last->buf[4] == '#') { + /* smart HTTP response; validate that the service + * pkt-line matches our request. + */ + struct strbuf exp = STRBUF_INIT; + + if (packet_get_line(&buffer, &last->buf, &last->len) <= 0) + die("%s has invalid packet header", refs_url); + if (buffer.len && buffer.buf[buffer.len - 1] == '\n') + strbuf_setlen(&buffer, buffer.len - 1); + + strbuf_addf(&exp, "# service=%s", service); + if (strbuf_cmp(&exp, &buffer)) + die("invalid server response; got '%s'", buffer.buf); + 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. + */ + strbuf_reset(&buffer); + while (packet_get_line(&buffer, &last->buf, &last->len) > 0) + strbuf_reset(&buffer); + + last->proto_git = 1; + } + + free(refs_url); + strbuf_release(&buffer); + last_discovery = last; + return last; +} + +static int write_discovery(int fd, void *data) +{ + struct discovery *heads = data; + int err = 0; + if (write_in_full(fd, heads->buf, heads->len) != heads->len) + err = 1; + close(fd); + return err; +} + +static struct ref *parse_git_refs(struct discovery *heads) +{ + struct ref *list = NULL; + struct async async; + + memset(&async, 0, sizeof(async)); + async.proc = write_discovery; + async.data = heads; + + if (start_async(&async)) + die("cannot start thread to parse advertised refs"); + get_remote_heads(async.out, &list, 0, NULL, 0, NULL); + close(async.out); + if (finish_async(&async)) + die("ref parsing thread failed"); + 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') { + data[i] = 0; + ref_name = mid + 1; + ref = xmalloc(sizeof(struct ref) + + strlen(ref_name) + 1); + memset(ref, 0, sizeof(struct ref)); + strcpy(ref->name, ref_name); + get_sha1_hex(start, ref->old_sha1); + if (!refs) + refs = ref; + if (last_ref) + last_ref->next = ref; + last_ref = ref; + start = NULL; + } + i++; + } + + init_walker(); + ref = alloc_ref("HEAD"); + if (!walker->fetch_ref(walker, ref) && + !resolve_remote_symref(ref, refs)) { + ref->next = refs; + refs = ref; + } else { + free(ref); + } + + return refs; +} + +static struct ref *get_refs(int for_push) +{ + struct discovery *heads; + + if (for_push) + heads = discover_refs("git-receive-pack"); + else + heads = discover_refs("git-upload-pack"); + + if (heads->proto_git) + return parse_git_refs(heads); + return parse_info_refs(heads); +} + +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", sha1_to_hex(posn->old_sha1), posn->name); + } + printf("\n"); + fflush(stdout); + free_refs(refs); +} + +struct rpc_state { + const char *service_name; + const char **argv; + char *service_url; + char *hdr_content_type; + char *hdr_accept; + char *buf; + size_t alloc; + size_t len; + size_t pos; + int in; + int out; + struct strbuf result; + unsigned gzip_request : 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) { + avail = packet_read_line(rpc->out, rpc->buf, rpc->alloc); + 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; +} + +static size_t rpc_in(const void *ptr, size_t eltsize, + size_t nmemb, void *buffer_) +{ + size_t size = eltsize * nmemb; + struct rpc_state *rpc = buffer_; + write_or_die(rpc->in, ptr, size); + return size; +} + +static int post_rpc(struct rpc_state *rpc) +{ + struct active_request_slot *slot; + struct slot_results results; + struct curl_slist *headers = NULL; + int use_gzip = rpc->gzip_request; + char *gzip_body = NULL; + int err = 0, large_request = 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_line(rpc->out, buf, left); + if (!n) + break; + rpc->len += n; + } + + slot = get_active_slot(); + slot->results = &results; + + 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, ""); + + headers = curl_slist_append(headers, rpc->hdr_content_type); + headers = curl_slist_append(headers, rpc->hdr_accept); + + 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, "Expect: 100-continue"); + headers = curl_slist_append(headers, "Transfer-Encoding: chunked"); + curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, rpc_out); + curl_easy_setopt(slot->curl, CURLOPT_INFILE, rpc); + if (options.verbosity > 1) { + fprintf(stderr, "POST %s (chunked)\n", rpc->service_name); + fflush(stderr); + } + + } 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. + */ + size_t size; + z_stream stream; + int ret; + + memset(&stream, 0, sizeof(stream)); + ret = deflateInit2(&stream, Z_BEST_COMPRESSION, + Z_DEFLATED, (15 + 16), + 8, Z_DEFAULT_STRATEGY); + if (ret != Z_OK) + die("cannot deflate request; zlib init error %d", ret); + size = deflateBound(&stream, rpc->len); + gzip_body = xmalloc(size); + + stream.next_in = (unsigned char *)rpc->buf; + stream.avail_in = rpc->len; + stream.next_out = (unsigned char *)gzip_body; + stream.avail_out = size; + + ret = deflate(&stream, Z_FINISH); + if (ret != Z_STREAM_END) + die("cannot deflate request; zlib deflate error %d", ret); + + ret = deflateEnd(&stream); + if (ret != Z_OK) + die("cannot deflate request; zlib end error %d", ret); + + 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, size); + + if (options.verbosity > 1) { + fprintf(stderr, "POST %s (gzip %lu to %lu bytes)\n", + rpc->service_name, + (unsigned long)rpc->len, (unsigned long)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, 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); + + slot->curl_result = curl_easy_perform(slot->curl); + finish_active_slot(slot); + + if (results.curl_result != CURLE_OK) { + err |= error("RPC failed; result=%d, HTTP code = %ld", + results.curl_result, results.http_code); + } + + 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 child_process client; + int err = 0; + + init_walker(); + memset(&client, 0, sizeof(client)); + client.in = -1; + client.out = -1; + client.git_cmd = 1; + client.argv = rpc->argv; + if (start_command(&client)) + exit(1); + 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, 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-response", svc); + rpc->hdr_accept = strbuf_detach(&buf, NULL); + + while (!err) { + int n = packet_read_line(rpc->out, rpc->buf, rpc->alloc); + if (!n) + break; + rpc->pos = 0; + rpc->len = n; + err |= post_rpc(rpc); + } + strbuf_read(&rpc->result, client.out, 0); + + close(client.in); + close(client.out); + client.in = -1; + client.out = -1; + + err |= finish_command(&client); + free(rpc->service_url); + free(rpc->hdr_content_type); + free(rpc->hdr_accept); + free(rpc->buf); + strbuf_release(&buf); + return err; +} + +static int fetch_dumb(int nr_heads, struct ref **to_fetch) +{ + char **targets = xmalloc(nr_heads * sizeof(char*)); + int ret, i; + + if (options.depth) + die("dumb http transport does not support --depth"); + for (i = 0; i < nr_heads; i++) + targets[i] = xstrdup(sha1_to_hex(to_fetch[i]->old_sha1)); + + init_walker(); + walker->get_all = 1; + walker->get_tree = 1; + walker->get_history = 1; + walker->get_verbosely = options.verbosity >= 3; + walker->get_recover = 0; + ret = walker_fetch(walker, nr_heads, targets, NULL, NULL); + + 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; + char *depth_arg = NULL; + const char **argv; + int argc = 0, i, err; + + argv = xmalloc((15 + nr_heads) * sizeof(char*)); + argv[argc++] = "fetch-pack"; + argv[argc++] = "--stateless-rpc"; + argv[argc++] = "--lock-pack"; + if (options.followtags) + argv[argc++] = "--include-tag"; + if (options.thin) + argv[argc++] = "--thin"; + if (options.verbosity >= 3) { + argv[argc++] = "-v"; + argv[argc++] = "-v"; + } + if (!options.progress) + argv[argc++] = "--no-progress"; + if (options.depth) { + struct strbuf buf = STRBUF_INIT; + strbuf_addf(&buf, "--depth=%lu", options.depth); + depth_arg = strbuf_detach(&buf, NULL); + argv[argc++] = depth_arg; + } + argv[argc++] = url; + for (i = 0; i < nr_heads; i++) { + struct ref *ref = to_fetch[i]; + if (!ref->name || !*ref->name) + die("cannot fetch by sha1 over smart http"); + argv[argc++] = ref->name; + } + argv[argc++] = NULL; + + memset(&rpc, 0, sizeof(rpc)); + rpc.service_name = "git-upload-pack", + rpc.argv = argv; + rpc.gzip_request = 1; + + err = rpc_service(&rpc, heads); + if (rpc.result.len) + safe_write(1, rpc.result.buf, rpc.result.len); + strbuf_release(&rpc.result); + free(argv); + free(depth_arg); + return err; +} + +static int fetch(int nr_heads, struct ref **to_fetch) +{ + struct discovery *d = discover_refs("git-upload-pack"); + 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 { + if (!prefixcmp(buf->buf, "fetch ")) { + char *p = buf->buf + strlen("fetch "); + char *name; + struct ref *ref; + unsigned char old_sha1[20]; + + if (strlen(p) < 40 || get_sha1_hex(p, old_sha1)) + die("protocol error: expected sha/ref, got %s'", p); + if (p[40] == ' ') + name = p + 41; + else if (!p[40]) + name = ""; + else + die("protocol error: expected sha/ref, got %s'", p); + + ref = alloc_ref(name); + hashcpy(ref->old_sha1, old_sha1); + + *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(buf, stdin, '\n') == 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) +{ + const char **argv = xmalloc((10 + nr_spec) * sizeof(char*)); + int argc = 0, i; + + argv[argc++] = "http-push"; + argv[argc++] = "--helper-status"; + if (options.dry_run) + argv[argc++] = "--dry-run"; + if (options.verbosity > 1) + argv[argc++] = "--verbose"; + argv[argc++] = url; + for (i = 0; i < nr_spec; i++) + argv[argc++] = specs[i]; + argv[argc++] = NULL; + + if (run_command_v_opt(argv, RUN_GIT_CMD)) + die("git-%s failed", argv[0]); + free(argv); + return 0; +} + +static int push_git(struct discovery *heads, int nr_spec, char **specs) +{ + struct rpc_state rpc; + const char **argv; + int argc = 0, i, err; + + argv = xmalloc((10 + nr_spec) * sizeof(char*)); + argv[argc++] = "send-pack"; + argv[argc++] = "--stateless-rpc"; + argv[argc++] = "--helper-status"; + if (options.thin) + argv[argc++] = "--thin"; + if (options.dry_run) + argv[argc++] = "--dry-run"; + if (options.verbosity > 1) + argv[argc++] = "--verbose"; + argv[argc++] = url; + for (i = 0; i < nr_spec; i++) + argv[argc++] = specs[i]; + argv[argc++] = NULL; + + memset(&rpc, 0, sizeof(rpc)); + rpc.service_name = "git-receive-pack", + rpc.argv = argv; + + err = rpc_service(&rpc, heads); + if (rpc.result.len) + safe_write(1, rpc.result.buf, rpc.result.len); + strbuf_release(&rpc.result); + free(argv); + return err; +} + +static int push(int nr_spec, char **specs) +{ + struct discovery *heads = discover_refs("git-receive-pack"); + 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; + + do { + if (!prefixcmp(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(buf, stdin, '\n') == EOF) + return; + if (!*buf->buf) + break; + } while (1); + + if (push(nr_spec, specs)) + exit(128); /* error already reported */ + for (i = 0; i < nr_spec; i++) + free(specs[i]); + free(specs); + + printf("\n"); + fflush(stdout); +} + +int main(int argc, const char **argv) +{ + struct strbuf buf = STRBUF_INIT; + int nongit; + + git_extract_argv0_path(argv[0]); + setup_git_directory_gently(&nongit); + if (argc < 2) { + fprintf(stderr, "Remote needed\n"); + return 1; + } + + options.verbosity = 1; + options.progress = !!isatty(2); + options.thin = 1; + + remote = remote_get(argv[1]); + + if (argc > 2) { + url = argv[2]; + } else { + url = remote->url[0]; + } + + do { + if (strbuf_getline(&buf, stdin, '\n') == EOF) + break; + if (!prefixcmp(buf.buf, "fetch ")) { + if (nongit) + die("Fetch attempted without a local repo"); + parse_fetch(&buf); + + } else if (!strcmp(buf.buf, "list") || !prefixcmp(buf.buf, "list ")) { + int for_push = !!strstr(buf.buf + 4, "for-push"); + output_refs(get_refs(for_push)); + + } else if (!prefixcmp(buf.buf, "push ")) { + parse_push(&buf); + + } else if (!prefixcmp(buf.buf, "option ")) { + char *name = buf.buf + strlen("option "); + char *value = strchr(name, ' '); + int result; + + if (value) + *value++ = '\0'; + else + value = "true"; + + result = set_option(name, 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("fetch\n"); + printf("option\n"); + printf("push\n"); + printf("\n"); + fflush(stdout); + } else { + return 1; + } + strbuf_reset(&buf); + } while (1); + return 0; +} |