Andrew's git - gitweb.git/blob - builtin/upload-archive.c

   1/*
   2 * Copyright (c) 2006 Franck Bui-Huu
   3 */
   4#include "cache.h"
   5#include "builtin.h"
   6#include "archive.h"
   7#include "pkt-line.h"
   8#include "sideband.h"
   9#include "run-command.h"
  10
  11static const char upload_archive_usage[] =
  12        "git upload-archive <repo>";
  13
  14static const char deadchild[] =
  15"git upload-archive: archiver died with error";
  16
  17#define MAX_ARGS (64)
  18
  19int cmd_upload_archive_writer(int argc, const char **argv, const char *prefix)
  20{
  21        const char *sent_argv[MAX_ARGS];
  22        const char *arg_cmd = "argument ";
  23        char *p, buf[4096];
  24        int sent_argc;
  25        int len;
  26
  27        if (argc != 2)
  28                usage(upload_archive_usage);
  29
  30        if (!enter_repo(argv[1], 0))
  31                die("'%s' does not appear to be a git repository", argv[1]);
  32
  33        /* put received options in sent_argv[] */
  34        sent_argc = 1;
  35        sent_argv[0] = "git-upload-archive";
  36        for (p = buf;;) {
  37                /* This will die if not enough free space in buf */
  38                len = packet_read_line(0, p, (buf + sizeof buf) - p);
  39                if (len == 0)
  40                        break;  /* got a flush */
  41                if (sent_argc > MAX_ARGS - 2)
  42                        die("Too many options (>%d)", MAX_ARGS - 2);
  43
  44                if (p[len-1] == '\n') {
  45                        p[--len] = 0;
  46                }
  47                if (len < strlen(arg_cmd) ||
  48                    strncmp(arg_cmd, p, strlen(arg_cmd)))
  49                        die("'argument' token or flush expected");
  50
  51                len -= strlen(arg_cmd);
  52                memmove(p, p + strlen(arg_cmd), len);
  53                sent_argv[sent_argc++] = p;
  54                p += len;
  55                *p++ = 0;
  56        }
  57        sent_argv[sent_argc] = NULL;
  58
  59        /* parse all options sent by the client */
  60        return write_archive(sent_argc, sent_argv, prefix, 0, NULL, 1);
  61}
  62
  63__attribute__((format (printf, 1, 2)))
  64static void error_clnt(const char *fmt, ...)
  65{
  66        char buf[1024];
  67        va_list params;
  68        int len;
  69
  70        va_start(params, fmt);
  71        len = vsprintf(buf, fmt, params);
  72        va_end(params);
  73        send_sideband(1, 3, buf, len, LARGE_PACKET_MAX);
  74        die("sent error to the client: %s", buf);
  75}
  76
  77static ssize_t process_input(int child_fd, int band)
  78{
  79        char buf[16384];
  80        ssize_t sz = read(child_fd, buf, sizeof(buf));
  81        if (sz < 0) {
  82                if (errno != EAGAIN && errno != EINTR)
  83                        error_clnt("read error: %s\n", strerror(errno));
  84                return sz;
  85        }
  86        send_sideband(1, band, buf, sz, LARGE_PACKET_MAX);
  87        return sz;
  88}
  89
  90int cmd_upload_archive(int argc, const char **argv, const char *prefix)
  91{
  92        struct child_process writer = { argv };
  93
  94        /*
  95         * Set up sideband subprocess.
  96         *
  97         * We (parent) monitor and read from child, sending its fd#1 and fd#2
  98         * multiplexed out to our fd#1.  If the child dies, we tell the other
  99         * end over channel #3.
 100         */
 101        argv[0] = "upload-archive--writer";
 102        writer.out = writer.err = -1;
 103        writer.git_cmd = 1;
 104        if (start_command(&writer)) {
 105                int err = errno;
 106                packet_write(1, "NACK unable to spawn subprocess\n");
 107                die("upload-archive: %s", strerror(err));
 108        }
 109
 110        packet_write(1, "ACK\n");
 111        packet_flush(1);
 112
 113        while (1) {
 114                struct pollfd pfd[2];
 115
 116                pfd[0].fd = writer.out;
 117                pfd[0].events = POLLIN;
 118                pfd[1].fd = writer.err;
 119                pfd[1].events = POLLIN;
 120                if (poll(pfd, 2, -1) < 0) {
 121                        if (errno != EINTR) {
 122                                error("poll failed resuming: %s",
 123                                      strerror(errno));
 124                                sleep(1);
 125                        }
 126                        continue;
 127                }
 128                if (pfd[1].revents & POLLIN)
 129                        /* Status stream ready */
 130                        if (process_input(pfd[1].fd, 2))
 131                                continue;
 132                if (pfd[0].revents & POLLIN)
 133                        /* Data stream ready */
 134                        if (process_input(pfd[0].fd, 1))
 135                                continue;
 136
 137                if (finish_command(&writer))
 138                        error_clnt("%s", deadchild);
 139                packet_flush(1);
 140                break;
 141        }
 142        return 0;
 143}