diff options
Diffstat (limited to 'third_party/git/transport-helper.c')
| -rw-r--r-- | third_party/git/transport-helper.c | 1604 |
1 files changed, 0 insertions, 1604 deletions
diff --git a/third_party/git/transport-helper.c b/third_party/git/transport-helper.c deleted file mode 100644 index b573b6c730cc..000000000000 --- a/third_party/git/transport-helper.c +++ /dev/null @@ -1,1604 +0,0 @@ -#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 "strvec.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, - object_format : 1; - - /* - * As an optimization, the transport code may invoke fetch before - * get_refs_list. If this happens, and if the transport helper doesn't - * support connect or stateless_connect, we need to invoke - * get_refs_list ourselves if we haven't already done so. Keep track of - * whether we have invoked get_refs_list. - */ - unsigned get_refs_list_called : 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; - strvec_pushf(&helper->args, "remote-%s", data->name); - strvec_push(&helper->args, transport->remote->name); - strvec_push(&helper->args, remove_ext_force(transport->url)); - helper->git_cmd = 1; - helper->silent_exec_failure = 1; - - if (have_git_dir()) - strvec_pushf(&helper->env_array, "%s=%s", - GIT_DIR_ENVIRONMENT, get_git_dir()); - - helper->trace2_child_class = helper->args.v[0]; /* "remote-<name>" */ - - 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 (starts_with(capname, "object-format")) { - data->object_format = 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) { - const char *name; - - if (recvline(data, &buf)) - exit(128); - - if (skip_prefix(buf.buf, "lock ", &name)) { - if (transport->pack_lockfiles.nr) - warning(_("%s also locked %s"), data->name, name); - else - string_list_append(&transport->pack_lockfiles, - 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 = xdup(helper->out); - strvec_push(&fastimport->args, "fast-import"); - strvec_push(&fastimport->args, "--allow-unsafe-features"); - strvec_push(&fastimport->args, debug ? "--stats" : "--quiet"); - - if (data->bidi_import) { - cat_blob_fd = xdup(helper->in); - strvec_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); - strvec_push(&fastexport->args, "fast-export"); - strvec_push(&fastexport->args, "--use-done-feature"); - strvec_push(&fastexport->args, data->signed_tags ? - "--signed-tags=verbatim" : "--signed-tags=warn-strip"); - if (data->export_marks) - strvec_pushf(&fastexport->args, "--export-marks=%s.tmp", data->export_marks); - if (data->import_marks) - strvec_pushf(&fastexport->args, "--import-marks=%s", data->import_marks); - - for (i = 0; i < revlist_args->nr; i++) - strvec_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 struct ref *get_refs_list_using_list(struct transport *transport, - int for_push); - -static int fetch(struct transport *transport, - int nr_heads, struct ref **to_fetch) -{ - struct helper_data *data = transport->data; - int i, count; - - get_helper(transport); - - if (process_connect(transport, 0)) { - do_take_over(transport); - return transport->vtable->fetch(transport, nr_heads, to_fetch); - } - - if (!data->get_refs_list_called) - get_refs_list_using_list(transport, 0); - - 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) { - const char *spec = expand_list_objects_filter_spec( - &data->transport_options.filter_options); - set_helper_option(transport, "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; -} - -struct push_update_ref_state { - struct ref *hint; - struct ref_push_report *report; - int new_report; -}; - -static int push_update_ref_status(struct strbuf *buf, - struct push_update_ref_state *state, - struct ref *remote_refs) -{ - char *refname, *msg; - int status, forced = 0; - - if (starts_with(buf->buf, "option ")) { - struct object_id old_oid, new_oid; - const char *key, *val; - char *p; - - if (!state->hint || !(state->report || state->new_report)) - die(_("'option' without a matching 'ok/error' directive")); - if (state->new_report) { - if (!state->hint->report) { - state->hint->report = xcalloc(1, sizeof(struct ref_push_report)); - state->report = state->hint->report; - } else { - state->report = state->hint->report; - while (state->report->next) - state->report = state->report->next; - state->report->next = xcalloc(1, sizeof(struct ref_push_report)); - state->report = state->report->next; - } - state->new_report = 0; - } - key = buf->buf + 7; - p = strchr(key, ' '); - if (p) - *p++ = '\0'; - val = p; - if (!strcmp(key, "refname")) - state->report->ref_name = xstrdup_or_null(val); - else if (!strcmp(key, "old-oid") && val && - !parse_oid_hex(val, &old_oid, &val)) - state->report->old_oid = oiddup(&old_oid); - else if (!strcmp(key, "new-oid") && val && - !parse_oid_hex(val, &new_oid, &val)) - state->report->new_oid = oiddup(&new_oid); - else if (!strcmp(key, "forced-update")) - state->report->forced_update = 1; - /* Not update remote namespace again. */ - return 1; - } - - state->report = NULL; - state->new_report = 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 (state->hint) - state->hint = find_ref_by_name(state->hint, refname); - if (!state->hint) - state->hint = find_ref_by_name(remote_refs, refname); - if (!state->hint) { - warning(_("helper reported unexpected status of %s"), refname); - return 1; - } - - if (state->hint->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; - } - - if (status == REF_STATUS_OK) - state->new_report = 1; - state->hint->status = status; - state->hint->forced_update |= forced; - state->hint->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 ref *ref; - struct ref_push_report *report; - struct strbuf buf = STRBUF_INIT; - struct push_update_ref_state state = { remote_refs, NULL, 0 }; - - for (;;) { - if (recvline(data, &buf)) { - strbuf_release(&buf); - return 1; - } - if (!buf.len) - break; - push_update_ref_status(&buf, &state, remote_refs); - } - strbuf_release(&buf); - - if (flags & TRANSPORT_PUSH_DRY_RUN || !data->rs.nr || data->no_private_update) - return 0; - - /* propagate back the update to the remote namespace */ - for (ref = remote_refs; ref; ref = ref->next) { - char *private; - - if (ref->status != REF_STATUS_OK) - continue; - - if (!ref->report) { - private = apply_refspecs(&data->rs, ref->name); - if (!private) - continue; - update_ref("update by helper", private, &(ref->new_oid), - NULL, 0, 0); - free(private); - } else { - for (report = ref->report; report; report = report->next) { - private = apply_refspecs(&data->rs, - report->ref_name - ? report->ref_name - : ref->name); - if (!private) - continue; - update_ref("update by helper", private, - report->new_oid - ? report->new_oid - : &(ref->new_oid), - NULL, 0, 0); - free(private); - } - } - } - return 0; -} - -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_ATOMIC) - if (set_helper_option(transport, TRANS_OPT_ATOMIC, "true") != 0) - die(_("helper %s does not support --atomic"), 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; - int atomic = flags & TRANSPORT_PUSH_ATOMIC; - 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: - if (atomic) { - reject_atomic_push(remote_refs, mirror); - string_list_clear(&cas_options, 0); - return 0; - } else - continue; - 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.\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 strvec *ref_prefixes) -{ - get_helper(transport); - - if (process_connect(transport, for_push)) { - do_take_over(transport); - return transport->vtable->get_refs_list(transport, for_push, ref_prefixes); - } - - return get_refs_list_using_list(transport, for_push); -} - -static struct ref *get_refs_list_using_list(struct transport *transport, - int for_push) -{ - 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; - - data->get_refs_list_called = 1; - helper = get_helper(transport); - - if (data->object_format) { - write_str_in_full(helper->in, "option object-format\n"); - if (recvline(data, &buf) || strcmp(buf.buf, "ok")) - exit(128); - } - - 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; - else if (buf.buf[0] == ':') { - const char *value; - if (skip_prefix(buf.buf, ":object-format ", &value)) { - int algo = hash_algo_by_name(value); - if (algo == GIT_HASH_UNKNOWN) - die(_("unsupported object format '%s'"), - value); - transport->hash_algo = &hash_algos[algo]; - } - continue; - } - - 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_algop(buf.buf, &(*tail)->old_oid, transport->hash_algo); - 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 = { - 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); -} - -void reject_atomic_push(struct ref *remote_refs, int mirror_mode) -{ - struct ref *ref; - - /* Mark other refs as failed */ - for (ref = remote_refs; ref; ref = ref->next) { - if (!ref->peer_ref && !mirror_mode) - continue; - - switch (ref->status) { - case REF_STATUS_NONE: - case REF_STATUS_OK: - case REF_STATUS_EXPECTING_REPORT: - ref->status = REF_STATUS_ATOMIC_PUSH_FAILED; - continue; - default: - break; /* do nothing */ - } - } - return; -} |