root/builtin/remote-fd.c

DEFINITIONS

1. command_loop
2. cmd_remote_fd

#include "builtin.h"
#include "transport.h"

/*
 * URL syntax:
 *      'fd::<inoutfd>[/<anything>]'            Read/write socket pair
 *                                              <inoutfd>.
 *      'fd::<infd>,<outfd>[/<anything>]'       Read pipe <infd> and write
 *                                              pipe <outfd>.
 *      [foo] indicates 'foo' is optional. <anything> is any string.
 *
 * The data output to <outfd>/<inoutfd> should be passed unmolested to
 * git-receive-pack/git-upload-pack/git-upload-archive and output of
 * git-receive-pack/git-upload-pack/git-upload-archive should be passed
 * unmolested to <infd>/<inoutfd>.
 *
 */

#define MAXCOMMAND 4096

static void command_loop(int input_fd, int output_fd)
{
        char buffer[MAXCOMMAND];

        while (1) {
                size_t i;
                if (!fgets(buffer, MAXCOMMAND - 1, stdin)) {
                        if (ferror(stdin))
                                die("Input error");
                        return;
                }
                /* Strip end of line characters. */
                i = strlen(buffer);
                while (i > 0 && isspace(buffer[i - 1]))
                        buffer[--i] = 0;

                if (!strcmp(buffer, "capabilities")) {
                        printf("*connect\n\n");
                        fflush(stdout);
                } else if (!strncmp(buffer, "connect ", 8)) {
                        printf("\n");
                        fflush(stdout);
                        if (bidirectional_transfer_loop(input_fd,
                                output_fd))
                                die("Copying data between file descriptors failed");
                        return;
                } else {
                        die("Bad command: %s", buffer);
                }
        }
}

int cmd_remote_fd(int argc, const char **argv, const char *prefix)
{
        int input_fd = -1;
        int output_fd = -1;
        char *end;

        if (argc != 3)
                die("Expected two arguments");

        input_fd = (int)strtoul(argv[2], &end, 10);

        if ((end == argv[2]) || (*end != ',' && *end != '/' && *end))
                die("Bad URL syntax");

        if (*end == '/' || !*end) {
                output_fd = input_fd;
        } else {
                char *end2;
                output_fd = (int)strtoul(end + 1, &end2, 10);

                if ((end2 == end + 1) || (*end2 != '/' && *end2))
                        die("Bad URL syntax");
        }

        command_loop(input_fd, output_fd);
        return 0;
}