root/builtin/upload-archive.c

DEFINITIONS

1. cmd_upload_archive_writer
2. error_clnt
3. process_input
4. cmd_upload_archive

/*
 * Copyright (c) 2006 Franck Bui-Huu
 */
#include "cache.h"
#include "builtin.h"
#include "archive.h"
#include "pkt-line.h"
#include "sideband.h"
#include "run-command.h"
#include "argv-array.h"

static const char upload_archive_usage[] =
        "git upload-archive <repo>";

static const char deadchild[] =
"git upload-archive: archiver died with error";

#define MAX_ARGS (64)

int cmd_upload_archive_writer(int argc, const char **argv, const char *prefix)
{
        struct argv_array sent_argv = ARGV_ARRAY_INIT;
        const char *arg_cmd = "argument ";

        if (argc != 2)
                usage(upload_archive_usage);

        if (!enter_repo(argv[1], 0))
                die("'%s' does not appear to be a git repository", argv[1]);

        /* put received options in sent_argv[] */
        argv_array_push(&sent_argv, "git-upload-archive");
        for (;;) {
                char *buf = packet_read_line(0, NULL);
                if (!buf)
                        break;  /* got a flush */
                if (sent_argv.argc > MAX_ARGS)
                        die("Too many options (>%d)", MAX_ARGS - 1);

                if (!starts_with(buf, arg_cmd))
                        die("'argument' token or flush expected");
                argv_array_push(&sent_argv, buf + strlen(arg_cmd));
        }

        /* parse all options sent by the client */
        return write_archive(sent_argv.argc, sent_argv.argv, prefix, 0, NULL, 1);
}

__attribute__((format (printf, 1, 2)))
static void error_clnt(const char *fmt, ...)
{
        char buf[1024];
        va_list params;
        int len;

        va_start(params, fmt);
        len = vsprintf(buf, fmt, params);
        va_end(params);
        send_sideband(1, 3, buf, len, LARGE_PACKET_MAX);
        die("sent error to the client: %s", buf);
}

static ssize_t process_input(int child_fd, int band)
{
        char buf[16384];
        ssize_t sz = read(child_fd, buf, sizeof(buf));
        if (sz < 0) {
                if (errno != EAGAIN && errno != EINTR)
                        error_clnt("read error: %s\n", strerror(errno));
                return sz;
        }
        send_sideband(1, band, buf, sz, LARGE_PACKET_MAX);
        return sz;
}

int cmd_upload_archive(int argc, const char **argv, const char *prefix)
{
        struct child_process writer = { argv };

        /*
         * Set up sideband subprocess.
         *
         * We (parent) monitor and read from child, sending its fd#1 and fd#2
         * multiplexed out to our fd#1.  If the child dies, we tell the other
         * end over channel #3.
         */
        argv[0] = "upload-archive--writer";
        writer.out = writer.err = -1;
        writer.git_cmd = 1;
        if (start_command(&writer)) {
                int err = errno;
                packet_write(1, "NACK unable to spawn subprocess\n");
                die("upload-archive: %s", strerror(err));
        }

        packet_write(1, "ACK\n");
        packet_flush(1);

        while (1) {
                struct pollfd pfd[2];

                pfd[0].fd = writer.out;
                pfd[0].events = POLLIN;
                pfd[1].fd = writer.err;
                pfd[1].events = POLLIN;
                if (poll(pfd, 2, -1) < 0) {
                        if (errno != EINTR) {
                                error("poll failed resuming: %s",
                                      strerror(errno));
                                sleep(1);
                        }
                        continue;
                }
                if (pfd[1].revents & POLLIN)
                        /* Status stream ready */
                        if (process_input(pfd[1].fd, 2))
                                continue;
                if (pfd[0].revents & POLLIN)
                        /* Data stream ready */
                        if (process_input(pfd[0].fd, 1))
                                continue;

                if (finish_command(&writer))
                        error_clnt("%s", deadchild);
                packet_flush(1);
                break;
        }
        return 0;
}