| #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" |
| |
| 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, |
| 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 *refspecs; |
| int refspec_nr; |
| /* 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) |
| != buffer->len) |
| die_errno("Full write to remote helper failed"); |
| } |
| |
| static int recvline_fh(FILE *helper, struct strbuf *buffer, const char *name) |
| { |
| 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, helper->name); |
| } |
| |
| 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)) != strlen(str)) |
| 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; |
| const char **refspecs = NULL; |
| int refspec_nr = 0; |
| int refspec_alloc = 0; |
| 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; |
| |
| 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; |
| |
| /* |
| * 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 (!data->refspecs && skip_prefix(capname, "refspec ", &arg)) { |
| ALLOC_GROW(refspecs, |
| refspec_nr + 1, |
| refspec_alloc); |
| refspecs[refspec_nr++] = xstrdup(arg); |
| } else if (!strcmp(capname, "connect")) { |
| data->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 (refspecs) { |
| int i; |
| data->refspec_nr = refspec_nr; |
| data->refspecs = parse_fetch_refspec(refspec_nr, refspecs); |
| for (i = 0; i < refspec_nr; i++) |
| free((char *)refspecs[i]); |
| free(refspecs); |
| } else if (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(data->helper); |
| data->helper = NULL; |
| } |
| 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 n; |
| int v = t->verbose; |
| |
| set_helper_option(t, "progress", t->progress ? "true" : "false"); |
| |
| n = snprintf(buf, sizeof(buf), "%d", v + 1); |
| if (n >= sizeof(buf)) |
| die("impossibly large verbosity value"); |
| 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; |
| free_refspec(data->refspec_nr, data->refspecs); |
| data->refspecs = NULL; |
| 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, 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->refspecs) |
| private = apply_refspecs(data->refspecs, data->refspec_nr, name); |
| else |
| private = xstrdup(name); |
| if (private) { |
| if (read_ref(private, posn->old_oid.hash) < 0) |
| die("Could not read ref %s", private); |
| free(private); |
| } |
| } |
| strbuf_release(&buf); |
| return 0; |
| } |
| |
| 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; |
| struct child_process *helper; |
| int r, duped, ret = 0; |
| FILE *input; |
| |
| 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); |
| |
| /* |
| * Handle --upload-pack and friends. This is fire and forget... |
| * just warn if it fails. |
| */ |
| if (strcmp(name, exec)) { |
| 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); |
| else |
| goto exit; |
| |
| sendline(data, &cmdbuf); |
| if (recvline_fh(input, &cmdbuf, name)) |
| 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); |
| |
| exit: |
| fclose(input); |
| 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->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->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(msg); |
| msg = NULL; |
| } |
| else if (!strcmp(msg, "up to date")) { |
| status = REF_STATUS_UPTODATE; |
| free(msg); |
| msg = NULL; |
| } |
| else if (!strcmp(msg, "non-fast forward")) { |
| status = REF_STATUS_REJECT_NONFASTFORWARD; |
| free(msg); |
| msg = NULL; |
| } |
| else if (!strcmp(msg, "already exists")) { |
| status = REF_STATUS_REJECT_ALREADY_EXISTS; |
| free(msg); |
| msg = NULL; |
| } |
| else if (!strcmp(msg, "fetch first")) { |
| status = REF_STATUS_REJECT_FETCH_FIRST; |
| free(msg); |
| msg = NULL; |
| } |
| else if (!strcmp(msg, "needs force")) { |
| status = REF_STATUS_REJECT_NEEDS_FORCE; |
| free(msg); |
| msg = NULL; |
| } |
| else if (!strcmp(msg, "stale info")) { |
| status = REF_STATUS_REJECT_STALE; |
| free(msg); |
| msg = NULL; |
| } |
| else if (!strcmp(msg, "forced update")) { |
| forced = 1; |
| free(msg); |
| msg = NULL; |
| } |
| } |
| |
| 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->refspecs || data->no_private_update) |
| continue; |
| |
| /* propagate back the update to the remote namespace */ |
| private = apply_refspecs(data->refspecs, data->refspec_nr, ref->name); |
| if (!private) |
| continue; |
| update_ref("update by helper", private, ref->new_oid.hash, 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); |
| } |
| } |
| |
| 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(&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); |
| |
| 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->refspecs) |
| 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->refspecs, data->refspec_nr, ref->name); |
| if (private && !get_sha1(private, oid.hash)) { |
| strbuf_addf(&buf, "^%s", private); |
| string_list_append(&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.hash, &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->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) |
| { |
| 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->get_refs_list(transport, for_push); |
| } |
| |
| 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.hash) < 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; |
| } |
| |
| 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->set_option = set_helper_option; |
| transport->get_refs_list = get_refs_list; |
| transport->fetch = fetch; |
| transport->push_refs = push_refs; |
| transport->disconnect = release_helper; |
| transport->connect = connect_helper; |
| 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, ...) |
| { |
| 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 = read(t->src, t->buf + t->bufuse, BUFFERSIZE - t->bufuse); |
| if (bytes < 0 && errno != EWOULDBLOCK && errno != EAGAIN && |
| errno != EINTR) { |
| 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 && errno != EWOULDBLOCK) { |
| 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); |
| } |