#include "cache.h" #include "transport.h" #include "quote.h" #include "run-command.h" #include "commit.h" #include "diff.h" #include "revision.h" #include "remote.h" #include "string-list.h" #include "thread-utils.h" #include "sigchain.h" #include "argv-array.h" #include "refs.h" #include "refspec.h" #include "transport-internal.h" #include "protocol.h" static int debug; struct helper_data { const char *name; struct child_process *helper; FILE *out; unsigned fetch : 1, import : 1, bidi_import : 1, export : 1, option : 1, push : 1, connect : 1, stateless_connect : 1, signed_tags : 1, check_connectivity : 1, no_disconnect_req : 1, no_private_update : 1; char *export_marks; char *import_marks; /* These go from remote name (as in "list") to private name */ struct refspec rs; /* Transport options for fetch-pack/send-pack (should one of * those be invoked). */ struct git_transport_options transport_options; }; static void sendline(struct helper_data *helper, struct strbuf *buffer) { if (debug) fprintf(stderr, "Debug: Remote helper: -> %s", buffer->buf); if (write_in_full(helper->helper->in, buffer->buf, buffer->len) < 0) die_errno(_("full write to remote helper failed")); } static int recvline_fh(FILE *helper, struct strbuf *buffer) { strbuf_reset(buffer); if (debug) fprintf(stderr, "Debug: Remote helper: Waiting...\n"); if (strbuf_getline(buffer, helper) == EOF) { if (debug) fprintf(stderr, "Debug: Remote helper quit.\n"); return 1; } if (debug) fprintf(stderr, "Debug: Remote helper: <- %s\n", buffer->buf); return 0; } static int recvline(struct helper_data *helper, struct strbuf *buffer) { return recvline_fh(helper->out, buffer); } static void write_constant(int fd, const char *str) { if (debug) fprintf(stderr, "Debug: Remote helper: -> %s", str); if (write_in_full(fd, str, strlen(str)) < 0) die_errno(_("full write to remote helper failed")); } static const char *remove_ext_force(const char *url) { if (url) { const char *colon = strchr(url, ':'); if (colon && colon[1] == ':') return colon + 2; } return url; } static void do_take_over(struct transport *transport) { struct helper_data *data; data = (struct helper_data *)transport->data; transport_take_over(transport, data->helper); fclose(data->out); free(data); } static void standard_options(struct transport *t); static struct child_process *get_helper(struct transport *transport) { struct helper_data *data = transport->data; struct strbuf buf = STRBUF_INIT; struct child_process *helper; int duped; int code; if (data->helper) return data->helper; helper = xmalloc(sizeof(*helper)); child_process_init(helper); helper->in = -1; helper->out = -1; helper->err = 0; argv_array_pushf(&helper->args, "git-remote-%s", data->name); argv_array_push(&helper->args, transport->remote->name); argv_array_push(&helper->args, remove_ext_force(transport->url)); helper->git_cmd = 0; helper->silent_exec_failure = 1; if (have_git_dir()) argv_array_pushf(&helper->env_array, "%s=%s", GIT_DIR_ENVIRONMENT, get_git_dir()); code = start_command(helper); if (code < 0 && errno == ENOENT) die(_("unable to find remote helper for '%s'"), data->name); else if (code != 0) exit(code); data->helper = helper; data->no_disconnect_req = 0; refspec_init(&data->rs, REFSPEC_FETCH); /* * Open the output as FILE* so strbuf_getline_*() family of * functions can be used. * Do this with duped fd because fclose() will close the fd, * and stuff like taking over will require the fd to remain. */ duped = dup(helper->out); if (duped < 0) die_errno(_("can't dup helper output fd")); data->out = xfdopen(duped, "r"); write_constant(helper->in, "capabilities\n"); while (1) { const char *capname, *arg; int mandatory = 0; if (recvline(data, &buf)) exit(128); if (!*buf.buf) break; if (*buf.buf == '*') { capname = buf.buf + 1; mandatory = 1; } else capname = buf.buf; if (debug) fprintf(stderr, "Debug: Got cap %s\n", capname); if (!strcmp(capname, "fetch")) data->fetch = 1; else if (!strcmp(capname, "option")) data->option = 1; else if (!strcmp(capname, "push")) data->push = 1; else if (!strcmp(capname, "import")) data->import = 1; else if (!strcmp(capname, "bidi-import")) data->bidi_import = 1; else if (!strcmp(capname, "export")) data->export = 1; else if (!strcmp(capname, "check-connectivity")) data->check_connectivity = 1; else if (skip_prefix(capname, "refspec ", &arg)) { refspec_append(&data->rs, arg); } else if (!strcmp(capname, "connect")) { data->connect = 1; } else if (!strcmp(capname, "stateless-connect")) { data->stateless_connect = 1; } else if (!strcmp(capname, "signed-tags")) { data->signed_tags = 1; } else if (skip_prefix(capname, "export-marks ", &arg)) { data->export_marks = xstrdup(arg); } else if (skip_prefix(capname, "import-marks ", &arg)) { data->import_marks = xstrdup(arg); } else if (starts_with(capname, "no-private-update")) { data->no_private_update = 1; } else if (mandatory) { die(_("unknown mandatory capability %s; this remote " "helper probably needs newer version of Git"), capname); } } if (!data->rs.nr && (data->import || data->bidi_import || data->export)) { warning(_("this remote helper should implement refspec capability")); } strbuf_release(&buf); if (debug) fprintf(stderr, "Debug: Capabilities complete.\n"); standard_options(transport); return data->helper; } static int disconnect_helper(struct transport *transport) { struct helper_data *data = transport->data; int res = 0; if (data->helper) { if (debug) fprintf(stderr, "Debug: Disconnecting.\n"); if (!data->no_disconnect_req) { /* * Ignore write errors; there's nothing we can do, * since we're about to close the pipe anyway. And the * most likely error is EPIPE due to the helper dying * to report an error itself. */ sigchain_push(SIGPIPE, SIG_IGN); xwrite(data->helper->in, "\n", 1); sigchain_pop(SIGPIPE); } close(data->helper->in); close(data->helper->out); fclose(data->out); res = finish_command(data->helper); FREE_AND_NULL(data->helper); } return res; } static const char *unsupported_options[] = { TRANS_OPT_UPLOADPACK, TRANS_OPT_RECEIVEPACK, TRANS_OPT_THIN, TRANS_OPT_KEEP }; static const char *boolean_options[] = { TRANS_OPT_THIN, TRANS_OPT_KEEP, TRANS_OPT_FOLLOWTAGS, TRANS_OPT_DEEPEN_RELATIVE }; static int strbuf_set_helper_option(struct helper_data *data, struct strbuf *buf) { int ret; sendline(data, buf); if (recvline(data, buf)) exit(128); if (!strcmp(buf->buf, "ok")) ret = 0; else if (starts_with(buf->buf, "error")) ret = -1; else if (!strcmp(buf->buf, "unsupported")) ret = 1; else { warning(_("%s unexpectedly said: '%s'"), data->name, buf->buf); ret = 1; } return ret; } static int string_list_set_helper_option(struct helper_data *data, const char *name, struct string_list *list) { struct strbuf buf = STRBUF_INIT; int i, ret = 0; for (i = 0; i < list->nr; i++) { strbuf_addf(&buf, "option %s ", name); quote_c_style(list->items[i].string, &buf, NULL, 0); strbuf_addch(&buf, '\n'); if ((ret = strbuf_set_helper_option(data, &buf))) break; strbuf_reset(&buf); } strbuf_release(&buf); return ret; } static int set_helper_option(struct transport *transport, const char *name, const char *value) { struct helper_data *data = transport->data; struct strbuf buf = STRBUF_INIT; int i, ret, is_bool = 0; get_helper(transport); if (!data->option) return 1; if (!strcmp(name, "deepen-not")) return string_list_set_helper_option(data, name, (struct string_list *)value); for (i = 0; i < ARRAY_SIZE(unsupported_options); i++) { if (!strcmp(name, unsupported_options[i])) return 1; } for (i = 0; i < ARRAY_SIZE(boolean_options); i++) { if (!strcmp(name, boolean_options[i])) { is_bool = 1; break; } } strbuf_addf(&buf, "option %s ", name); if (is_bool) strbuf_addstr(&buf, value ? "true" : "false"); else quote_c_style(value, &buf, NULL, 0); strbuf_addch(&buf, '\n'); ret = strbuf_set_helper_option(data, &buf); strbuf_release(&buf); return ret; } static void standard_options(struct transport *t) { char buf[16]; int v = t->verbose; set_helper_option(t, "progress", t->progress ? "true" : "false"); xsnprintf(buf, sizeof(buf), "%d", v + 1); set_helper_option(t, "verbosity", buf); switch (t->family) { case TRANSPORT_FAMILY_ALL: /* * this is already the default, * do not break old remote helpers by setting "all" here */ break; case TRANSPORT_FAMILY_IPV4: set_helper_option(t, "family", "ipv4"); break; case TRANSPORT_FAMILY_IPV6: set_helper_option(t, "family", "ipv6"); break; } } static int release_helper(struct transport *transport) { int res = 0; struct helper_data *data = transport->data; refspec_clear(&data->rs); res = disconnect_helper(transport); free(transport->data); return res; } static int fetch_with_fetch(struct transport *transport, int nr_heads, struct ref **to_fetch) { struct helper_data *data = transport->data; int i; struct strbuf buf = STRBUF_INIT; for (i = 0; i < nr_heads; i++) { const struct ref *posn = to_fetch[i]; if (posn->status & REF_STATUS_UPTODATE) continue; strbuf_addf(&buf, "fetch %s %s\n", oid_to_hex(&posn->old_oid), posn->symref ? posn->symref : posn->name); } strbuf_addch(&buf, '\n'); sendline(data, &buf); while (1) { if (recvline(data, &buf)) exit(128); if (starts_with(buf.buf, "lock ")) { const char *name = buf.buf + 5; if (transport->pack_lockfile) warning(_("%s also locked %s"), data->name, name); else transport->pack_lockfile = xstrdup(name); } else if (data->check_connectivity && data->transport_options.check_self_contained_and_connected && !strcmp(buf.buf, "connectivity-ok")) data->transport_options.self_contained_and_connected = 1; else if (!buf.len) break; else warning(_("%s unexpectedly said: '%s'"), data->name, buf.buf); } strbuf_release(&buf); return 0; } static int get_importer(struct transport *transport, struct child_process *fastimport) { struct child_process *helper = get_helper(transport); struct helper_data *data = transport->data; int cat_blob_fd, code; child_process_init(fastimport); fastimport->in = helper->out; argv_array_push(&fastimport->args, "fast-import"); argv_array_push(&fastimport->args, "--allow-unsafe-features"); argv_array_push(&fastimport->args, debug ? "--stats" : "--quiet"); if (data->bidi_import) { cat_blob_fd = xdup(helper->in); argv_array_pushf(&fastimport->args, "--cat-blob-fd=%d", cat_blob_fd); } fastimport->git_cmd = 1; code = start_command(fastimport); return code; } static int get_exporter(struct transport *transport, struct child_process *fastexport, struct string_list *revlist_args) { struct helper_data *data = transport->data; struct child_process *helper = get_helper(transport); int i; child_process_init(fastexport); /* we need to duplicate helper->in because we want to use it after * fastexport is done with it. */ fastexport->out = dup(helper->in); argv_array_push(&fastexport->args, "fast-export"); argv_array_push(&fastexport->args, "--use-done-feature"); argv_array_push(&fastexport->args, data->signed_tags ? "--signed-tags=verbatim" : "--signed-tags=warn-strip"); if (data->export_marks) argv_array_pushf(&fastexport->args, "--export-marks=%s.tmp", data->export_marks); if (data->import_marks) argv_array_pushf(&fastexport->args, "--import-marks=%s", data->import_marks); for (i = 0; i < revlist_args->nr; i++) argv_array_push(&fastexport->args, revlist_args->items[i].string); fastexport->git_cmd = 1; return start_command(fastexport); } static int fetch_with_import(struct transport *transport, int nr_heads, struct ref **to_fetch) { struct child_process fastimport; struct helper_data *data = transport->data; int i; struct ref *posn; struct strbuf buf = STRBUF_INIT; get_helper(transport); if (get_importer(transport, &fastimport)) die(_("couldn't run fast-import")); for (i = 0; i < nr_heads; i++) { posn = to_fetch[i]; if (posn->status & REF_STATUS_UPTODATE) continue; strbuf_addf(&buf, "import %s\n", posn->symref ? posn->symref : posn->name); sendline(data, &buf); strbuf_reset(&buf); } write_constant(data->helper->in, "\n"); /* * remote-helpers that advertise the bidi-import capability are required to * buffer the complete batch of import commands until this newline before * sending data to fast-import. * These helpers read back data from fast-import on their stdin, which could * be mixed with import commands, otherwise. */ if (finish_command(&fastimport)) die(_("error while running fast-import")); /* * The fast-import stream of a remote helper that advertises * the "refspec" capability writes to the refs named after the * right hand side of the first refspec matching each ref we * were fetching. * * (If no "refspec" capability was specified, for historical * reasons we default to the equivalent of *:*.) * * Store the result in to_fetch[i].old_sha1. Callers such * as "git fetch" can use the value to write feedback to the * terminal, populate FETCH_HEAD, and determine what new value * should be written to peer_ref if the update is a * fast-forward or this is a forced update. */ for (i = 0; i < nr_heads; i++) { char *private, *name; posn = to_fetch[i]; if (posn->status & REF_STATUS_UPTODATE) continue; name = posn->symref ? posn->symref : posn->name; if (data->rs.nr) private = apply_refspecs(&data->rs, name); else private = xstrdup(name); if (private) { if (read_ref(private, &posn->old_oid) < 0) die(_("could not read ref %s"), private); free(private); } } strbuf_release(&buf); return 0; } static int run_connect(struct transport *transport, struct strbuf *cmdbuf) { struct helper_data *data = transport->data; int ret = 0; int duped; FILE *input; struct child_process *helper; helper = get_helper(transport); /* * Yes, dup the pipe another time, as we need unbuffered version * of input pipe as FILE*. fclose() closes the underlying fd and * stream buffering only can be changed before first I/O operation * on it. */ duped = dup(helper->out); if (duped < 0) die_errno(_("can't dup helper output fd")); input = xfdopen(duped, "r"); setvbuf(input, NULL, _IONBF, 0); sendline(data, cmdbuf); if (recvline_fh(input, cmdbuf)) exit(128); if (!strcmp(cmdbuf->buf, "")) { data->no_disconnect_req = 1; if (debug) fprintf(stderr, "Debug: Smart transport connection " "ready.\n"); ret = 1; } else if (!strcmp(cmdbuf->buf, "fallback")) { if (debug) fprintf(stderr, "Debug: Falling back to dumb " "transport.\n"); } else { die(_("unknown response to connect: %s"), cmdbuf->buf); } fclose(input); return ret; } static int process_connect_service(struct transport *transport, const char *name, const char *exec) { struct helper_data *data = transport->data; struct strbuf cmdbuf = STRBUF_INIT; int ret = 0; /* * Handle --upload-pack and friends. This is fire and forget... * just warn if it fails. */ if (strcmp(name, exec)) { int r = set_helper_option(transport, "servpath", exec); if (r > 0) warning(_("setting remote service path not supported by protocol")); else if (r < 0) warning(_("invalid remote service path")); } if (data->connect) { strbuf_addf(&cmdbuf, "connect %s\n", name); ret = run_connect(transport, &cmdbuf); } else if (data->stateless_connect && (get_protocol_version_config() == protocol_v2) && !strcmp("git-upload-pack", name)) { strbuf_addf(&cmdbuf, "stateless-connect %s\n", name); ret = run_connect(transport, &cmdbuf); if (ret) transport->stateless_rpc = 1; } strbuf_release(&cmdbuf); return ret; } static int process_connect(struct transport *transport, int for_push) { struct helper_data *data = transport->data; const char *name; const char *exec; name = for_push ? "git-receive-pack" : "git-upload-pack"; if (for_push) exec = data->transport_options.receivepack; else exec = data->transport_options.uploadpack; return process_connect_service(transport, name, exec); } static int connect_helper(struct transport *transport, const char *name, const char *exec, int fd[2]) { struct helper_data *data = transport->data; /* Get_helper so connect is inited. */ get_helper(transport); if (!data->connect) die(_("operation not supported by protocol")); if (!process_connect_service(transport, name, exec)) die(_("can't connect to subservice %s"), name); fd[0] = data->helper->out; fd[1] = data->helper->in; return 0; } static int fetch(struct transport *transport, int nr_heads, struct ref **to_fetch) { struct helper_data *data = transport->data; int i, count; if (process_connect(transport, 0)) { do_take_over(transport); return transport->vtable->fetch(transport, nr_heads, to_fetch); } count = 0; for (i = 0; i < nr_heads; i++) if (!(to_fetch[i]->status & REF_STATUS_UPTODATE)) count++; if (!count) return 0; if (data->check_connectivity && data->transport_options.check_self_contained_and_connected) set_helper_option(transport, "check-connectivity", "true"); if (transport->cloning) set_helper_option(transport, "cloning", "true"); if (data->transport_options.update_shallow) set_helper_option(transport, "update-shallow", "true"); if (data->transport_options.filter_options.choice) { struct strbuf expanded_filter_spec = STRBUF_INIT; expand_list_objects_filter_spec( &data->transport_options.filter_options, &expanded_filter_spec); set_helper_option(transport, "filter", expanded_filter_spec.buf); strbuf_release(&expanded_filter_spec); } if (data->transport_options.negotiation_tips) warning("Ignoring --negotiation-tip because the protocol does not support it."); if (data->fetch) return fetch_with_fetch(transport, nr_heads, to_fetch); if (data->import) return fetch_with_import(transport, nr_heads, to_fetch); return -1; } static int push_update_ref_status(struct strbuf *buf, struct ref **ref, struct ref *remote_refs) { char *refname, *msg; int status, forced = 0; if (starts_with(buf->buf, "ok ")) { status = REF_STATUS_OK; refname = buf->buf + 3; } else if (starts_with(buf->buf, "error ")) { status = REF_STATUS_REMOTE_REJECT; refname = buf->buf + 6; } else die(_("expected ok/error, helper said '%s'"), buf->buf); msg = strchr(refname, ' '); if (msg) { struct strbuf msg_buf = STRBUF_INIT; const char *end; *msg++ = '\0'; if (!unquote_c_style(&msg_buf, msg, &end)) msg = strbuf_detach(&msg_buf, NULL); else msg = xstrdup(msg); strbuf_release(&msg_buf); if (!strcmp(msg, "no match")) { status = REF_STATUS_NONE; FREE_AND_NULL(msg); } else if (!strcmp(msg, "up to date")) { status = REF_STATUS_UPTODATE; FREE_AND_NULL(msg); } else if (!strcmp(msg, "non-fast forward")) { status = REF_STATUS_REJECT_NONFASTFORWARD; FREE_AND_NULL(msg); } else if (!strcmp(msg, "already exists")) { status = REF_STATUS_REJECT_ALREADY_EXISTS; FREE_AND_NULL(msg); } else if (!strcmp(msg, "fetch first")) { status = REF_STATUS_REJECT_FETCH_FIRST; FREE_AND_NULL(msg); } else if (!strcmp(msg, "needs force")) { status = REF_STATUS_REJECT_NEEDS_FORCE; FREE_AND_NULL(msg); } else if (!strcmp(msg, "stale info")) { status = REF_STATUS_REJECT_STALE; FREE_AND_NULL(msg); } else if (!strcmp(msg, "forced update")) { forced = 1; FREE_AND_NULL(msg); } } if (*ref) *ref = find_ref_by_name(*ref, refname); if (!*ref) *ref = find_ref_by_name(remote_refs, refname); if (!*ref) { warning(_("helper reported unexpected status of %s"), refname); return 1; } if ((*ref)->status != REF_STATUS_NONE) { /* * Earlier, the ref was marked not to be pushed, so ignore the ref * status reported by the remote helper if the latter is 'no match'. */ if (status == REF_STATUS_NONE) return 1; } (*ref)->status = status; (*ref)->forced_update |= forced; (*ref)->remote_status = msg; return !(status == REF_STATUS_OK); } static int push_update_refs_status(struct helper_data *data, struct ref *remote_refs, int flags) { struct strbuf buf = STRBUF_INIT; struct ref *ref = remote_refs; int ret = 0; for (;;) { char *private; if (recvline(data, &buf)) { ret = 1; break; } if (!buf.len) break; if (push_update_ref_status(&buf, &ref, remote_refs)) continue; if (flags & TRANSPORT_PUSH_DRY_RUN || !data->rs.nr || data->no_private_update) continue; /* propagate back the update to the remote namespace */ private = apply_refspecs(&data->rs, ref->name); if (!private) continue; update_ref("update by helper", private, &ref->new_oid, NULL, 0, 0); free(private); } strbuf_release(&buf); return ret; } static void set_common_push_options(struct transport *transport, const char *name, int flags) { if (flags & TRANSPORT_PUSH_DRY_RUN) { if (set_helper_option(transport, "dry-run", "true") != 0) die(_("helper %s does not support dry-run"), name); } else if (flags & TRANSPORT_PUSH_CERT_ALWAYS) { if (set_helper_option(transport, TRANS_OPT_PUSH_CERT, "true") != 0) die(_("helper %s does not support --signed"), name); } else if (flags & TRANSPORT_PUSH_CERT_IF_ASKED) { if (set_helper_option(transport, TRANS_OPT_PUSH_CERT, "if-asked") != 0) die(_("helper %s does not support --signed=if-asked"), name); } if (flags & TRANSPORT_PUSH_OPTIONS) { struct string_list_item *item; for_each_string_list_item(item, transport->push_options) if (set_helper_option(transport, "push-option", item->string) != 0) die(_("helper %s does not support 'push-option'"), name); } } static int push_refs_with_push(struct transport *transport, struct ref *remote_refs, int flags) { int force_all = flags & TRANSPORT_PUSH_FORCE; int mirror = flags & TRANSPORT_PUSH_MIRROR; struct helper_data *data = transport->data; struct strbuf buf = STRBUF_INIT; struct ref *ref; struct string_list cas_options = STRING_LIST_INIT_DUP; struct string_list_item *cas_option; get_helper(transport); if (!data->push) return 1; for (ref = remote_refs; ref; ref = ref->next) { if (!ref->peer_ref && !mirror) continue; /* Check for statuses set by set_ref_status_for_push() */ switch (ref->status) { case REF_STATUS_REJECT_NONFASTFORWARD: case REF_STATUS_REJECT_STALE: case REF_STATUS_REJECT_ALREADY_EXISTS: case REF_STATUS_UPTODATE: continue; default: ; /* do nothing */ } if (force_all) ref->force = 1; strbuf_addstr(&buf, "push "); if (!ref->deletion) { if (ref->force) strbuf_addch(&buf, '+'); if (ref->peer_ref) strbuf_addstr(&buf, ref->peer_ref->name); else strbuf_addstr(&buf, oid_to_hex(&ref->new_oid)); } strbuf_addch(&buf, ':'); strbuf_addstr(&buf, ref->name); strbuf_addch(&buf, '\n'); /* * The "--force-with-lease" options without explicit * values to expect have already been expanded into * the ref->old_oid_expect[] field; we can ignore * transport->smart_options->cas altogether and instead * can enumerate them from the refs. */ if (ref->expect_old_sha1) { struct strbuf cas = STRBUF_INIT; strbuf_addf(&cas, "%s:%s", ref->name, oid_to_hex(&ref->old_oid_expect)); string_list_append_nodup(&cas_options, strbuf_detach(&cas, NULL)); } } if (buf.len == 0) { string_list_clear(&cas_options, 0); return 0; } for_each_string_list_item(cas_option, &cas_options) set_helper_option(transport, "cas", cas_option->string); set_common_push_options(transport, data->name, flags); strbuf_addch(&buf, '\n'); sendline(data, &buf); strbuf_release(&buf); string_list_clear(&cas_options, 0); return push_update_refs_status(data, remote_refs, flags); } static int push_refs_with_export(struct transport *transport, struct ref *remote_refs, int flags) { struct ref *ref; struct child_process *helper, exporter; struct helper_data *data = transport->data; struct string_list revlist_args = STRING_LIST_INIT_DUP; struct strbuf buf = STRBUF_INIT; if (!data->rs.nr) die(_("remote-helper doesn't support push; refspec needed")); set_common_push_options(transport, data->name, flags); if (flags & TRANSPORT_PUSH_FORCE) { if (set_helper_option(transport, "force", "true") != 0) warning(_("helper %s does not support 'force'"), data->name); } helper = get_helper(transport); write_constant(helper->in, "export\n"); for (ref = remote_refs; ref; ref = ref->next) { char *private; struct object_id oid; private = apply_refspecs(&data->rs, ref->name); if (private && !get_oid(private, &oid)) { strbuf_addf(&buf, "^%s", private); string_list_append_nodup(&revlist_args, strbuf_detach(&buf, NULL)); oidcpy(&ref->old_oid, &oid); } free(private); if (ref->peer_ref) { if (strcmp(ref->name, ref->peer_ref->name)) { if (!ref->deletion) { const char *name; int flag; /* Follow symbolic refs (mainly for HEAD). */ name = resolve_ref_unsafe(ref->peer_ref->name, RESOLVE_REF_READING, &oid, &flag); if (!name || !(flag & REF_ISSYMREF)) name = ref->peer_ref->name; strbuf_addf(&buf, "%s:%s", name, ref->name); } else strbuf_addf(&buf, ":%s", ref->name); string_list_append(&revlist_args, "--refspec"); string_list_append(&revlist_args, buf.buf); strbuf_release(&buf); } if (!ref->deletion) string_list_append(&revlist_args, ref->peer_ref->name); } } if (get_exporter(transport, &exporter, &revlist_args)) die(_("couldn't run fast-export")); string_list_clear(&revlist_args, 1); if (finish_command(&exporter)) die(_("error while running fast-export")); if (push_update_refs_status(data, remote_refs, flags)) return 1; if (data->export_marks) { strbuf_addf(&buf, "%s.tmp", data->export_marks); rename(buf.buf, data->export_marks); strbuf_release(&buf); } return 0; } static int push_refs(struct transport *transport, struct ref *remote_refs, int flags) { struct helper_data *data = transport->data; if (process_connect(transport, 1)) { do_take_over(transport); return transport->vtable->push_refs(transport, remote_refs, flags); } if (!remote_refs) { fprintf(stderr, _("No refs in common and none specified; doing nothing.\n" "Perhaps you should specify a branch such as 'master'.\n")); return 0; } if (data->push) return push_refs_with_push(transport, remote_refs, flags); if (data->export) return push_refs_with_export(transport, remote_refs, flags); return -1; } static int has_attribute(const char *attrs, const char *attr) { int len; if (!attrs) return 0; len = strlen(attr); for (;;) { const char *space = strchrnul(attrs, ' '); if (len == space - attrs && !strncmp(attrs, attr, len)) return 1; if (!*space) return 0; attrs = space + 1; } } static struct ref *get_refs_list(struct transport *transport, int for_push, const struct argv_array *ref_prefixes) { struct helper_data *data = transport->data; struct child_process *helper; struct ref *ret = NULL; struct ref **tail = &ret; struct ref *posn; struct strbuf buf = STRBUF_INIT; helper = get_helper(transport); if (process_connect(transport, for_push)) { do_take_over(transport); return transport->vtable->get_refs_list(transport, for_push, ref_prefixes); } if (data->push && for_push) write_str_in_full(helper->in, "list for-push\n"); else write_str_in_full(helper->in, "list\n"); while (1) { char *eov, *eon; if (recvline(data, &buf)) exit(128); if (!*buf.buf) break; eov = strchr(buf.buf, ' '); if (!eov) die(_("malformed response in ref list: %s"), buf.buf); eon = strchr(eov + 1, ' '); *eov = '\0'; if (eon) *eon = '\0'; *tail = alloc_ref(eov + 1); if (buf.buf[0] == '@') (*tail)->symref = xstrdup(buf.buf + 1); else if (buf.buf[0] != '?') get_oid_hex(buf.buf, &(*tail)->old_oid); if (eon) { if (has_attribute(eon + 1, "unchanged")) { (*tail)->status |= REF_STATUS_UPTODATE; if (read_ref((*tail)->name, &(*tail)->old_oid) < 0) die(_("could not read ref %s"), (*tail)->name); } } tail = &((*tail)->next); } if (debug) fprintf(stderr, "Debug: Read ref listing.\n"); strbuf_release(&buf); for (posn = ret; posn; posn = posn->next) resolve_remote_symref(posn, ret); return ret; } static struct transport_vtable vtable = { 0, set_helper_option, get_refs_list, fetch, push_refs, connect_helper, release_helper }; int transport_helper_init(struct transport *transport, const char *name) { struct helper_data *data = xcalloc(1, sizeof(*data)); data->name = name; transport_check_allowed(name); if (getenv("GIT_TRANSPORT_HELPER_DEBUG")) debug = 1; transport->data = data; transport->vtable = &vtable; transport->smart_options = &(data->transport_options); return 0; } /* * Linux pipes can buffer 65536 bytes at once (and most platforms can * buffer less), so attempt reads and writes with up to that size. */ #define BUFFERSIZE 65536 /* This should be enough to hold debugging message. */ #define PBUFFERSIZE 8192 /* Print bidirectional transfer loop debug message. */ __attribute__((format (printf, 1, 2))) static void transfer_debug(const char *fmt, ...) { /* * NEEDSWORK: This function is sometimes used from multiple threads, and * we end up using debug_enabled racily. That "should not matter" since * we always write the same value, but it's still wrong. This function * is listed in .tsan-suppressions for the time being. */ va_list args; char msgbuf[PBUFFERSIZE]; static int debug_enabled = -1; if (debug_enabled < 0) debug_enabled = getenv("GIT_TRANSLOOP_DEBUG") ? 1 : 0; if (!debug_enabled) return; va_start(args, fmt); vsnprintf(msgbuf, PBUFFERSIZE, fmt, args); va_end(args); fprintf(stderr, "Transfer loop debugging: %s\n", msgbuf); } /* Stream state: More data may be coming in this direction. */ #define SSTATE_TRANSFERRING 0 /* * Stream state: No more data coming in this direction, flushing rest of * data. */ #define SSTATE_FLUSHING 1 /* Stream state: Transfer in this direction finished. */ #define SSTATE_FINISHED 2 #define STATE_NEEDS_READING(state) ((state) <= SSTATE_TRANSFERRING) #define STATE_NEEDS_WRITING(state) ((state) <= SSTATE_FLUSHING) #define STATE_NEEDS_CLOSING(state) ((state) == SSTATE_FLUSHING) /* Unidirectional transfer. */ struct unidirectional_transfer { /* Source */ int src; /* Destination */ int dest; /* Is source socket? */ int src_is_sock; /* Is destination socket? */ int dest_is_sock; /* Transfer state (TRANSFERRING/FLUSHING/FINISHED) */ int state; /* Buffer. */ char buf[BUFFERSIZE]; /* Buffer used. */ size_t bufuse; /* Name of source. */ const char *src_name; /* Name of destination. */ const char *dest_name; }; /* Closes the target (for writing) if transfer has finished. */ static void udt_close_if_finished(struct unidirectional_transfer *t) { if (STATE_NEEDS_CLOSING(t->state) && !t->bufuse) { t->state = SSTATE_FINISHED; if (t->dest_is_sock) shutdown(t->dest, SHUT_WR); else close(t->dest); transfer_debug("Closed %s.", t->dest_name); } } /* * Tries to read data from source into buffer. If buffer is full, * no data is read. Returns 0 on success, -1 on error. */ static int udt_do_read(struct unidirectional_transfer *t) { ssize_t bytes; if (t->bufuse == BUFFERSIZE) return 0; /* No space for more. */ transfer_debug("%s is readable", t->src_name); bytes = xread(t->src, t->buf + t->bufuse, BUFFERSIZE - t->bufuse); if (bytes < 0) { error_errno(_("read(%s) failed"), t->src_name); return -1; } else if (bytes == 0) { transfer_debug("%s EOF (with %i bytes in buffer)", t->src_name, (int)t->bufuse); t->state = SSTATE_FLUSHING; } else if (bytes > 0) { t->bufuse += bytes; transfer_debug("Read %i bytes from %s (buffer now at %i)", (int)bytes, t->src_name, (int)t->bufuse); } return 0; } /* Tries to write data from buffer into destination. If buffer is empty, * no data is written. Returns 0 on success, -1 on error. */ static int udt_do_write(struct unidirectional_transfer *t) { ssize_t bytes; if (t->bufuse == 0) return 0; /* Nothing to write. */ transfer_debug("%s is writable", t->dest_name); bytes = xwrite(t->dest, t->buf, t->bufuse); if (bytes < 0) { error_errno(_("write(%s) failed"), t->dest_name); return -1; } else if (bytes > 0) { t->bufuse -= bytes; if (t->bufuse) memmove(t->buf, t->buf + bytes, t->bufuse); transfer_debug("Wrote %i bytes to %s (buffer now at %i)", (int)bytes, t->dest_name, (int)t->bufuse); } return 0; } /* State of bidirectional transfer loop. */ struct bidirectional_transfer_state { /* Direction from program to git. */ struct unidirectional_transfer ptg; /* Direction from git to program. */ struct unidirectional_transfer gtp; }; static void *udt_copy_task_routine(void *udt) { struct unidirectional_transfer *t = (struct unidirectional_transfer *)udt; while (t->state != SSTATE_FINISHED) { if (STATE_NEEDS_READING(t->state)) if (udt_do_read(t)) return NULL; if (STATE_NEEDS_WRITING(t->state)) if (udt_do_write(t)) return NULL; if (STATE_NEEDS_CLOSING(t->state)) udt_close_if_finished(t); } return udt; /* Just some non-NULL value. */ } #ifndef NO_PTHREADS /* * Join thread, with appropriate errors on failure. Name is name for the * thread (for error messages). Returns 0 on success, 1 on failure. */ static int tloop_join(pthread_t thread, const char *name) { int err; void *tret; err = pthread_join(thread, &tret); if (!tret) { error(_("%s thread failed"), name); return 1; } if (err) { error(_("%s thread failed to join: %s"), name, strerror(err)); return 1; } return 0; } /* * Spawn the transfer tasks and then wait for them. Returns 0 on success, * -1 on failure. */ static int tloop_spawnwait_tasks(struct bidirectional_transfer_state *s) { pthread_t gtp_thread; pthread_t ptg_thread; int err; int ret = 0; err = pthread_create(>p_thread, NULL, udt_copy_task_routine, &s->gtp); if (err) die(_("can't start thread for copying data: %s"), strerror(err)); err = pthread_create(&ptg_thread, NULL, udt_copy_task_routine, &s->ptg); if (err) die(_("can't start thread for copying data: %s"), strerror(err)); ret |= tloop_join(gtp_thread, "Git to program copy"); ret |= tloop_join(ptg_thread, "Program to git copy"); return ret; } #else /* Close the source and target (for writing) for transfer. */ static void udt_kill_transfer(struct unidirectional_transfer *t) { t->state = SSTATE_FINISHED; /* * Socket read end left open isn't a disaster if nobody * attempts to read from it (mingw compat headers do not * have SHUT_RD)... * * We can't fully close the socket since otherwise gtp * task would first close the socket it sends data to * while closing the ptg file descriptors. */ if (!t->src_is_sock) close(t->src); if (t->dest_is_sock) shutdown(t->dest, SHUT_WR); else close(t->dest); } /* * Join process, with appropriate errors on failure. Name is name for the * process (for error messages). Returns 0 on success, 1 on failure. */ static int tloop_join(pid_t pid, const char *name) { int tret; if (waitpid(pid, &tret, 0) < 0) { error_errno(_("%s process failed to wait"), name); return 1; } if (!WIFEXITED(tret) || WEXITSTATUS(tret)) { error(_("%s process failed"), name); return 1; } return 0; } /* * Spawn the transfer tasks and then wait for them. Returns 0 on success, * -1 on failure. */ static int tloop_spawnwait_tasks(struct bidirectional_transfer_state *s) { pid_t pid1, pid2; int ret = 0; /* Fork thread #1: git to program. */ pid1 = fork(); if (pid1 < 0) die_errno(_("can't start thread for copying data")); else if (pid1 == 0) { udt_kill_transfer(&s->ptg); exit(udt_copy_task_routine(&s->gtp) ? 0 : 1); } /* Fork thread #2: program to git. */ pid2 = fork(); if (pid2 < 0) die_errno(_("can't start thread for copying data")); else if (pid2 == 0) { udt_kill_transfer(&s->gtp); exit(udt_copy_task_routine(&s->ptg) ? 0 : 1); } /* * Close both streams in parent as to not interfere with * end of file detection and wait for both tasks to finish. */ udt_kill_transfer(&s->gtp); udt_kill_transfer(&s->ptg); ret |= tloop_join(pid1, "Git to program copy"); ret |= tloop_join(pid2, "Program to git copy"); return ret; } #endif /* * Copies data from stdin to output and from input to stdout simultaneously. * Additionally filtering through given filter. If filter is NULL, uses * identity filter. */ int bidirectional_transfer_loop(int input, int output) { struct bidirectional_transfer_state state; /* Fill the state fields. */ state.ptg.src = input; state.ptg.dest = 1; state.ptg.src_is_sock = (input == output); state.ptg.dest_is_sock = 0; state.ptg.state = SSTATE_TRANSFERRING; state.ptg.bufuse = 0; state.ptg.src_name = "remote input"; state.ptg.dest_name = "stdout"; state.gtp.src = 0; state.gtp.dest = output; state.gtp.src_is_sock = 0; state.gtp.dest_is_sock = (input == output); state.gtp.state = SSTATE_TRANSFERRING; state.gtp.bufuse = 0; state.gtp.src_name = "stdin"; state.gtp.dest_name = "remote output"; return tloop_spawnwait_tasks(&state); }