summaryrefslogtreecommitdiffstats
path: root/transport-helper.c
diff options
context:
space:
mode:
Diffstat (limited to 'transport-helper.c')
-rw-r--r--transport-helper.c1634
1 files changed, 1634 insertions, 0 deletions
diff --git a/transport-helper.c b/transport-helper.c
new file mode 100644
index 0000000..e95267a
--- /dev/null
+++ b/transport-helper.c
@@ -0,0 +1,1634 @@
+#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, "%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_refs(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_refs(transport, nr_heads, to_fetch);
+ }
+
+ /*
+ * If we reach here, then the server, the client, and/or the transport
+ * helper does not support protocol v2. --negotiate-only requires
+ * protocol v2.
+ */
+ if (data->transport_options.acked_commits) {
+ warning(_("--negotiate-only requires protocol v2"));
+ return -1;
+ }
+
+ 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.refetch)
+ set_helper_option(transport, "refetch", "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) {
+ CALLOC_ARRAY(state->hint->report, 1);
+ state->report = state->hint->report;
+ } else {
+ state->report = state->hint->report;
+ while (state->report->next)
+ state->report = state->report->next;
+ CALLOC_ARRAY(state->report->next, 1);
+ 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, "remote ref updated since checkout")) {
+ status = REF_STATUS_REJECT_REMOTE_UPDATED;
+ FREE_AND_NULL(msg);
+ }
+ else if (!strcmp(msg, "forced update")) {
+ forced = 1;
+ FREE_AND_NULL(msg);
+ }
+ else if (!strcmp(msg, "expecting report")) {
+ status = REF_STATUS_EXPECTING_REPORT;
+ 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_FORCE_IF_INCLUDES)
+ if (set_helper_option(transport, TRANS_OPT_FORCE_IF_INCLUDES, "true") != 0)
+ die(_("helper %s does not support --%s"),
+ name, TRANS_OPT_FORCE_IF_INCLUDES);
+
+ 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:
+ case REF_STATUS_REJECT_REMOTE_UPDATED:
+ 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,
+ struct transport_ls_refs_options *transport_options)
+{
+ get_helper(transport);
+
+ if (process_connect(transport, for_push)) {
+ do_take_over(transport);
+ return transport->vtable->get_refs_list(transport, for_push,
+ transport_options);
+ }
+
+ 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_option = set_helper_option,
+ .get_refs_list = get_refs_list,
+ .fetch_refs = fetch_refs,
+ .push_refs = push_refs,
+ .connect = connect_helper,
+ .disconnect = 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;
+
+ list_objects_filter_init(&data->transport_options.filter_options);
+
+ 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(&gtp_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;
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-16 00:07:37 +0000