mirror of
https://github.com/git/git.git
synced 2024-12-06 00:14:36 +08:00
82247e9bd5
The error handling routines add a newline. Remove the duplicate ones in error messages. Signed-off-by: Pete Wyckoff <pw@padd.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
1205 lines
29 KiB
C
1205 lines
29 KiB
C
#include "cache.h"
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#include "transport.h"
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#include "quote.h"
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#include "run-command.h"
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#include "commit.h"
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#include "diff.h"
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#include "revision.h"
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#include "quote.h"
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#include "remote.h"
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#include "string-list.h"
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#include "thread-utils.h"
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#include "sigchain.h"
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static int debug;
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struct helper_data {
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const char *name;
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struct child_process *helper;
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FILE *out;
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unsigned fetch : 1,
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import : 1,
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export : 1,
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option : 1,
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push : 1,
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connect : 1,
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no_disconnect_req : 1;
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char *export_marks;
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char *import_marks;
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/* These go from remote name (as in "list") to private name */
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struct refspec *refspecs;
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int refspec_nr;
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/* Transport options for fetch-pack/send-pack (should one of
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* those be invoked).
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*/
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struct git_transport_options transport_options;
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};
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static void sendline(struct helper_data *helper, struct strbuf *buffer)
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{
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if (debug)
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fprintf(stderr, "Debug: Remote helper: -> %s", buffer->buf);
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if (write_in_full(helper->helper->in, buffer->buf, buffer->len)
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!= buffer->len)
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die_errno("Full write to remote helper failed");
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}
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static int recvline_fh(FILE *helper, struct strbuf *buffer)
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{
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strbuf_reset(buffer);
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if (debug)
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fprintf(stderr, "Debug: Remote helper: Waiting...\n");
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if (strbuf_getline(buffer, helper, '\n') == EOF) {
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if (debug)
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fprintf(stderr, "Debug: Remote helper quit.\n");
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exit(128);
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}
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if (debug)
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fprintf(stderr, "Debug: Remote helper: <- %s\n", buffer->buf);
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return 0;
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}
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static int recvline(struct helper_data *helper, struct strbuf *buffer)
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{
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return recvline_fh(helper->out, buffer);
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}
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static void xchgline(struct helper_data *helper, struct strbuf *buffer)
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{
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sendline(helper, buffer);
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recvline(helper, buffer);
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}
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static void write_constant(int fd, const char *str)
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{
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if (debug)
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fprintf(stderr, "Debug: Remote helper: -> %s", str);
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if (write_in_full(fd, str, strlen(str)) != strlen(str))
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die_errno("Full write to remote helper failed");
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}
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static const char *remove_ext_force(const char *url)
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{
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if (url) {
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const char *colon = strchr(url, ':');
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if (colon && colon[1] == ':')
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return colon + 2;
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}
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return url;
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}
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static void do_take_over(struct transport *transport)
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{
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struct helper_data *data;
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data = (struct helper_data *)transport->data;
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transport_take_over(transport, data->helper);
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fclose(data->out);
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free(data);
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}
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static struct child_process *get_helper(struct transport *transport)
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{
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struct helper_data *data = transport->data;
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struct strbuf buf = STRBUF_INIT;
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struct child_process *helper;
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const char **refspecs = NULL;
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int refspec_nr = 0;
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int refspec_alloc = 0;
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int duped;
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int code;
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char git_dir_buf[sizeof(GIT_DIR_ENVIRONMENT) + PATH_MAX + 1];
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const char *helper_env[] = {
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git_dir_buf,
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NULL
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};
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if (data->helper)
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return data->helper;
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helper = xcalloc(1, sizeof(*helper));
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helper->in = -1;
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helper->out = -1;
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helper->err = 0;
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helper->argv = xcalloc(4, sizeof(*helper->argv));
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strbuf_addf(&buf, "git-remote-%s", data->name);
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helper->argv[0] = strbuf_detach(&buf, NULL);
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helper->argv[1] = transport->remote->name;
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helper->argv[2] = remove_ext_force(transport->url);
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helper->git_cmd = 0;
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helper->silent_exec_failure = 1;
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snprintf(git_dir_buf, sizeof(git_dir_buf), "%s=%s", GIT_DIR_ENVIRONMENT, get_git_dir());
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helper->env = helper_env;
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code = start_command(helper);
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if (code < 0 && errno == ENOENT)
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die("Unable to find remote helper for '%s'", data->name);
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else if (code != 0)
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exit(code);
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data->helper = helper;
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data->no_disconnect_req = 0;
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/*
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* Open the output as FILE* so strbuf_getline() can be used.
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* Do this with duped fd because fclose() will close the fd,
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* and stuff like taking over will require the fd to remain.
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*/
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duped = dup(helper->out);
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if (duped < 0)
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die_errno("Can't dup helper output fd");
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data->out = xfdopen(duped, "r");
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write_constant(helper->in, "capabilities\n");
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while (1) {
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const char *capname;
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int mandatory = 0;
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recvline(data, &buf);
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if (!*buf.buf)
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break;
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if (*buf.buf == '*') {
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capname = buf.buf + 1;
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mandatory = 1;
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} else
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capname = buf.buf;
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if (debug)
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fprintf(stderr, "Debug: Got cap %s\n", capname);
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if (!strcmp(capname, "fetch"))
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data->fetch = 1;
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else if (!strcmp(capname, "option"))
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data->option = 1;
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else if (!strcmp(capname, "push"))
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data->push = 1;
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else if (!strcmp(capname, "import"))
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data->import = 1;
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else if (!strcmp(capname, "export"))
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data->export = 1;
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else if (!data->refspecs && !prefixcmp(capname, "refspec ")) {
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ALLOC_GROW(refspecs,
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refspec_nr + 1,
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refspec_alloc);
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refspecs[refspec_nr++] = xstrdup(capname + strlen("refspec "));
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} else if (!strcmp(capname, "connect")) {
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data->connect = 1;
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} else if (!prefixcmp(capname, "export-marks ")) {
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struct strbuf arg = STRBUF_INIT;
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strbuf_addstr(&arg, "--export-marks=");
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strbuf_addstr(&arg, capname + strlen("export-marks "));
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data->export_marks = strbuf_detach(&arg, NULL);
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} else if (!prefixcmp(capname, "import-marks")) {
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struct strbuf arg = STRBUF_INIT;
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strbuf_addstr(&arg, "--import-marks=");
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strbuf_addstr(&arg, capname + strlen("import-marks "));
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data->import_marks = strbuf_detach(&arg, NULL);
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} else if (mandatory) {
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die("Unknown mandatory capability %s. This remote "
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"helper probably needs newer version of Git.",
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capname);
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}
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}
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if (refspecs) {
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int i;
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data->refspec_nr = refspec_nr;
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data->refspecs = parse_fetch_refspec(refspec_nr, refspecs);
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for (i = 0; i < refspec_nr; i++) {
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free((char *)refspecs[i]);
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}
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free(refspecs);
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}
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strbuf_release(&buf);
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if (debug)
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fprintf(stderr, "Debug: Capabilities complete.\n");
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return data->helper;
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}
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static int disconnect_helper(struct transport *transport)
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{
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struct helper_data *data = transport->data;
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int res = 0;
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if (data->helper) {
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if (debug)
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fprintf(stderr, "Debug: Disconnecting.\n");
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if (!data->no_disconnect_req) {
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/*
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* Ignore write errors; there's nothing we can do,
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* since we're about to close the pipe anyway. And the
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* most likely error is EPIPE due to the helper dying
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* to report an error itself.
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*/
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sigchain_push(SIGPIPE, SIG_IGN);
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xwrite(data->helper->in, "\n", 1);
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sigchain_pop(SIGPIPE);
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}
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close(data->helper->in);
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close(data->helper->out);
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fclose(data->out);
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res = finish_command(data->helper);
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free((char *)data->helper->argv[0]);
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free(data->helper->argv);
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free(data->helper);
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data->helper = NULL;
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}
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return res;
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}
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static const char *unsupported_options[] = {
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TRANS_OPT_UPLOADPACK,
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TRANS_OPT_RECEIVEPACK,
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TRANS_OPT_THIN,
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TRANS_OPT_KEEP
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};
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static const char *boolean_options[] = {
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TRANS_OPT_THIN,
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TRANS_OPT_KEEP,
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TRANS_OPT_FOLLOWTAGS
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};
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static int set_helper_option(struct transport *transport,
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const char *name, const char *value)
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{
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struct helper_data *data = transport->data;
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struct strbuf buf = STRBUF_INIT;
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int i, ret, is_bool = 0;
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get_helper(transport);
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if (!data->option)
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return 1;
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for (i = 0; i < ARRAY_SIZE(unsupported_options); i++) {
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if (!strcmp(name, unsupported_options[i]))
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return 1;
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}
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for (i = 0; i < ARRAY_SIZE(boolean_options); i++) {
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if (!strcmp(name, boolean_options[i])) {
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is_bool = 1;
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break;
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}
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}
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strbuf_addf(&buf, "option %s ", name);
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if (is_bool)
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strbuf_addstr(&buf, value ? "true" : "false");
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else
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quote_c_style(value, &buf, NULL, 0);
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strbuf_addch(&buf, '\n');
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xchgline(data, &buf);
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if (!strcmp(buf.buf, "ok"))
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ret = 0;
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else if (!prefixcmp(buf.buf, "error")) {
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ret = -1;
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} else if (!strcmp(buf.buf, "unsupported"))
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ret = 1;
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else {
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warning("%s unexpectedly said: '%s'", data->name, buf.buf);
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ret = 1;
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}
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strbuf_release(&buf);
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return ret;
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}
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static void standard_options(struct transport *t)
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{
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char buf[16];
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int n;
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int v = t->verbose;
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set_helper_option(t, "progress", t->progress ? "true" : "false");
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n = snprintf(buf, sizeof(buf), "%d", v + 1);
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if (n >= sizeof(buf))
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die("impossibly large verbosity value");
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set_helper_option(t, "verbosity", buf);
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}
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static int release_helper(struct transport *transport)
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{
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int res = 0;
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struct helper_data *data = transport->data;
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free_refspec(data->refspec_nr, data->refspecs);
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data->refspecs = NULL;
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res = disconnect_helper(transport);
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free(transport->data);
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return res;
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}
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static int fetch_with_fetch(struct transport *transport,
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int nr_heads, struct ref **to_fetch)
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{
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struct helper_data *data = transport->data;
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int i;
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struct strbuf buf = STRBUF_INIT;
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standard_options(transport);
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for (i = 0; i < nr_heads; i++) {
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const struct ref *posn = to_fetch[i];
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if (posn->status & REF_STATUS_UPTODATE)
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continue;
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strbuf_addf(&buf, "fetch %s %s\n",
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sha1_to_hex(posn->old_sha1), posn->name);
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}
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strbuf_addch(&buf, '\n');
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sendline(data, &buf);
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while (1) {
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recvline(data, &buf);
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if (!prefixcmp(buf.buf, "lock ")) {
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const char *name = buf.buf + 5;
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if (transport->pack_lockfile)
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warning("%s also locked %s", data->name, name);
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else
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transport->pack_lockfile = xstrdup(name);
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}
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else if (!buf.len)
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break;
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else
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warning("%s unexpectedly said: '%s'", data->name, buf.buf);
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}
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strbuf_release(&buf);
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return 0;
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}
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static int get_importer(struct transport *transport, struct child_process *fastimport)
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{
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struct child_process *helper = get_helper(transport);
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memset(fastimport, 0, sizeof(*fastimport));
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fastimport->in = helper->out;
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fastimport->argv = xcalloc(5, sizeof(*fastimport->argv));
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fastimport->argv[0] = "fast-import";
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fastimport->argv[1] = "--quiet";
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fastimport->git_cmd = 1;
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return start_command(fastimport);
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}
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static int get_exporter(struct transport *transport,
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struct child_process *fastexport,
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struct string_list *revlist_args)
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{
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struct helper_data *data = transport->data;
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struct child_process *helper = get_helper(transport);
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int argc = 0, i;
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memset(fastexport, 0, sizeof(*fastexport));
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/* we need to duplicate helper->in because we want to use it after
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* fastexport is done with it. */
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fastexport->out = dup(helper->in);
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fastexport->argv = xcalloc(5 + revlist_args->nr, sizeof(*fastexport->argv));
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fastexport->argv[argc++] = "fast-export";
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fastexport->argv[argc++] = "--use-done-feature";
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if (data->export_marks)
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fastexport->argv[argc++] = data->export_marks;
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if (data->import_marks)
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fastexport->argv[argc++] = data->import_marks;
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for (i = 0; i < revlist_args->nr; i++)
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fastexport->argv[argc++] = revlist_args->items[i].string;
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fastexport->git_cmd = 1;
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return start_command(fastexport);
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}
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static int fetch_with_import(struct transport *transport,
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int nr_heads, struct ref **to_fetch)
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{
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struct child_process fastimport;
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struct helper_data *data = transport->data;
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int i;
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struct ref *posn;
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struct strbuf buf = STRBUF_INIT;
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get_helper(transport);
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if (get_importer(transport, &fastimport))
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die("Couldn't run fast-import");
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for (i = 0; i < nr_heads; i++) {
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posn = to_fetch[i];
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if (posn->status & REF_STATUS_UPTODATE)
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continue;
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strbuf_addf(&buf, "import %s\n", posn->name);
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sendline(data, &buf);
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strbuf_reset(&buf);
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}
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write_constant(data->helper->in, "\n");
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if (finish_command(&fastimport))
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die("Error while running fast-import");
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free(fastimport.argv);
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fastimport.argv = NULL;
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for (i = 0; i < nr_heads; i++) {
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char *private;
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posn = to_fetch[i];
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if (posn->status & REF_STATUS_UPTODATE)
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continue;
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if (data->refspecs)
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private = apply_refspecs(data->refspecs, data->refspec_nr, posn->name);
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else
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private = xstrdup(posn->name);
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if (private) {
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read_ref(private, posn->old_sha1);
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free(private);
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}
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}
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strbuf_release(&buf);
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return 0;
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}
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static int process_connect_service(struct transport *transport,
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const char *name, const char *exec)
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{
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struct helper_data *data = transport->data;
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struct strbuf cmdbuf = STRBUF_INIT;
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struct child_process *helper;
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int r, duped, ret = 0;
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FILE *input;
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|
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helper = get_helper(transport);
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|
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/*
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* Yes, dup the pipe another time, as we need unbuffered version
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* of input pipe as FILE*. fclose() closes the underlying fd and
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* stream buffering only can be changed before first I/O operation
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* on it.
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*/
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duped = dup(helper->out);
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if (duped < 0)
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die_errno("Can't dup helper output fd");
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input = xfdopen(duped, "r");
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setvbuf(input, NULL, _IONBF, 0);
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|
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/*
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* Handle --upload-pack and friends. This is fire and forget...
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* just warn if it fails.
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*/
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if (strcmp(name, exec)) {
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r = set_helper_option(transport, "servpath", exec);
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if (r > 0)
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warning("Setting remote service path not supported by protocol.");
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else if (r < 0)
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warning("Invalid remote service path.");
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}
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if (data->connect)
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strbuf_addf(&cmdbuf, "connect %s\n", name);
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else
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goto exit;
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sendline(data, &cmdbuf);
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recvline_fh(input, &cmdbuf);
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if (!strcmp(cmdbuf.buf, "")) {
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data->no_disconnect_req = 1;
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if (debug)
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fprintf(stderr, "Debug: Smart transport connection "
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"ready.\n");
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ret = 1;
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} else if (!strcmp(cmdbuf.buf, "fallback")) {
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if (debug)
|
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fprintf(stderr, "Debug: Falling back to dumb "
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"transport.\n");
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} else
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die("Unknown response to connect: %s",
|
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cmdbuf.buf);
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|
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exit:
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fclose(input);
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return ret;
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}
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|
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static int process_connect(struct transport *transport,
|
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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->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 void push_update_ref_status(struct strbuf *buf,
|
|
struct ref **ref,
|
|
struct ref *remote_refs)
|
|
{
|
|
char *refname, *msg;
|
|
int status;
|
|
|
|
if (!prefixcmp(buf->buf, "ok ")) {
|
|
status = REF_STATUS_OK;
|
|
refname = buf->buf + 3;
|
|
} else if (!prefixcmp(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;
|
|
}
|
|
}
|
|
|
|
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;
|
|
}
|
|
|
|
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;
|
|
}
|
|
|
|
(*ref)->status = status;
|
|
(*ref)->remote_status = msg;
|
|
}
|
|
|
|
static void push_update_refs_status(struct helper_data *data,
|
|
struct ref *remote_refs)
|
|
{
|
|
struct strbuf buf = STRBUF_INIT;
|
|
struct ref *ref = remote_refs;
|
|
for (;;) {
|
|
recvline(data, &buf);
|
|
if (!buf.len)
|
|
break;
|
|
|
|
push_update_ref_status(&buf, &ref, remote_refs);
|
|
}
|
|
strbuf_release(&buf);
|
|
}
|
|
|
|
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;
|
|
|
|
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_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, sha1_to_hex(ref->new_sha1));
|
|
}
|
|
strbuf_addch(&buf, ':');
|
|
strbuf_addstr(&buf, ref->name);
|
|
strbuf_addch(&buf, '\n');
|
|
}
|
|
if (buf.len == 0)
|
|
return 0;
|
|
|
|
standard_options(transport);
|
|
|
|
if (flags & TRANSPORT_PUSH_DRY_RUN) {
|
|
if (set_helper_option(transport, "dry-run", "true") != 0)
|
|
die("helper %s does not support dry-run", data->name);
|
|
}
|
|
|
|
strbuf_addch(&buf, '\n');
|
|
sendline(data, &buf);
|
|
strbuf_release(&buf);
|
|
|
|
push_update_refs_status(data, remote_refs);
|
|
return 0;
|
|
}
|
|
|
|
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_NODUP;
|
|
struct strbuf buf = STRBUF_INIT;
|
|
|
|
helper = get_helper(transport);
|
|
|
|
write_constant(helper->in, "export\n");
|
|
|
|
strbuf_reset(&buf);
|
|
|
|
for (ref = remote_refs; ref; ref = ref->next) {
|
|
char *private;
|
|
unsigned char sha1[20];
|
|
|
|
if (!data->refspecs)
|
|
continue;
|
|
private = apply_refspecs(data->refspecs, data->refspec_nr, ref->name);
|
|
if (private && !get_sha1(private, sha1)) {
|
|
strbuf_addf(&buf, "^%s", private);
|
|
string_list_append(&revlist_args, strbuf_detach(&buf, NULL));
|
|
}
|
|
free(private);
|
|
|
|
if (ref->deletion) {
|
|
die("remote-helpers do not support ref deletion");
|
|
}
|
|
|
|
if (ref->peer_ref)
|
|
string_list_append(&revlist_args, ref->peer_ref->name);
|
|
|
|
}
|
|
|
|
if (get_exporter(transport, &exporter, &revlist_args))
|
|
die("Couldn't run fast-export");
|
|
|
|
if (finish_command(&exporter))
|
|
die("Error while running fast-export");
|
|
push_update_refs_status(data, remote_refs);
|
|
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;
|
|
recvline(data, &buf);
|
|
|
|
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_sha1_hex(buf.buf, (*tail)->old_sha1);
|
|
if (eon) {
|
|
if (has_attribute(eon + 1, "unchanged")) {
|
|
(*tail)->status |= REF_STATUS_UPTODATE;
|
|
read_ref((*tail)->name, (*tail)->old_sha1);
|
|
}
|
|
}
|
|
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(sizeof(*data), 1);
|
|
data->name = 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. */
|
|
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_TRANSFERING 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_TRANSFERING)
|
|
#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 (TRANSFERING/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 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("read(%s) failed: %s", t->src_name, strerror(errno));
|
|
return -1;
|
|
} else if (bytes == 0) {
|
|
transfer_debug("%s EOF (with %i bytes in buffer)",
|
|
t->src_name, 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 = write(t->dest, t->buf, t->bufuse);
|
|
if (bytes < 0 && errno != EWOULDBLOCK && errno != EAGAIN &&
|
|
errno != EINTR) {
|
|
error("write(%s) failed: %s", t->dest_name, strerror(errno));
|
|
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 apporiate 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 apporiate 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("%s process failed to wait: %s", name, strerror(errno));
|
|
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_TRANSFERING;
|
|
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_TRANSFERING;
|
|
state.gtp.bufuse = 0;
|
|
state.gtp.src_name = "stdin";
|
|
state.gtp.dest_name = "remote output";
|
|
|
|
return tloop_spawnwait_tasks(&state);
|
|
}
|