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 (strlen(argv[1]) + 1 > sizeof(buf))
  31                die("insanely long repository name");
  32
  33        strcpy(buf, argv[1]); /* enter-repo smudges its argument */
  34
  35        if (!enter_repo(buf, 0))
  36                die("'%s' does not appear to be a git repository", buf);
  37
  38        /* put received options in sent_argv[] */
  39        sent_argc = 1;
  40        sent_argv[0] = "git-upload-archive";
  41        for (p = buf;;) {
  42                /* This will die if not enough free space in buf */
  43                len = packet_read_line(0, p, (buf + sizeof buf) - p);
  44                if (len == 0)
  45                        break;  /* got a flush */
  46                if (sent_argc > MAX_ARGS - 2)
  47                        die("Too many options (>%d)", MAX_ARGS - 2);
  48
  49                if (p[len-1] == '\n') {
  50                        p[--len] = 0;
  51                }
  52                if (len < strlen(arg_cmd) ||
  53                    strncmp(arg_cmd, p, strlen(arg_cmd)))
  54                        die("'argument' token or flush expected");
  55
  56                len -= strlen(arg_cmd);
  57                memmove(p, p + strlen(arg_cmd), len);
  58                sent_argv[sent_argc++] = p;
  59                p += len;
  60                *p++ = 0;
  61        }
  62        sent_argv[sent_argc] = NULL;
  63
  64        /* parse all options sent by the client */
  65        return write_archive(sent_argc, sent_argv, prefix, 0, NULL, 1);
  66}
  67
  68__attribute__((format (printf, 1, 2)))
  69static void error_clnt(const char *fmt, ...)
  70{
  71        char buf[1024];
  72        va_list params;
  73        int len;
  74
  75        va_start(params, fmt);
  76        len = vsprintf(buf, fmt, params);
  77        va_end(params);
  78        send_sideband(1, 3, buf, len, LARGE_PACKET_MAX);
  79        die("sent error to the client: %s", buf);
  80}
  81
  82static ssize_t process_input(int child_fd, int band)
  83{
  84        char buf[16384];
  85        ssize_t sz = read(child_fd, buf, sizeof(buf));
  86        if (sz < 0) {
  87                if (errno != EAGAIN && errno != EINTR)
  88                        error_clnt("read error: %s\n", strerror(errno));
  89                return sz;
  90        }
  91        send_sideband(1, band, buf, sz, LARGE_PACKET_MAX);
  92        return sz;
  93}
  94
  95int cmd_upload_archive(int argc, const char **argv, const char *prefix)
  96{
  97        struct child_process writer = { argv };
  98
  99        /*
 100         * Set up sideband subprocess.
 101         *
 102         * We (parent) monitor and read from child, sending its fd#1 and fd#2
 103         * multiplexed out to our fd#1.  If the child dies, we tell the other
 104         * end over channel #3.
 105         */
 106        argv[0] = "upload-archive--writer";
 107        writer.out = writer.err = -1;
 108        writer.git_cmd = 1;
 109        if (start_command(&writer)) {
 110                int err = errno;
 111                packet_write(1, "NACK unable to spawn subprocess\n");
 112                die("upload-archive: %s", strerror(err));
 113        }
 114
 115        packet_write(1, "ACK\n");
 116        packet_flush(1);
 117
 118        while (1) {
 119                struct pollfd pfd[2];
 120
 121                pfd[0].fd = writer.out;
 122                pfd[0].events = POLLIN;
 123                pfd[1].fd = writer.err;
 124                pfd[1].events = POLLIN;
 125                if (poll(pfd, 2, -1) < 0) {
 126                        if (errno != EINTR) {
 127                                error("poll failed resuming: %s",
 128                                      strerror(errno));
 129                                sleep(1);
 130                        }
 131                        continue;
 132                }
 133                if (pfd[1].revents & POLLIN)
 134                        /* Status stream ready */
 135                        if (process_input(pfd[1].fd, 2))
 136                                continue;
 137                if (pfd[0].revents & POLLIN)
 138                        /* Data stream ready */
 139                        if (process_input(pfd[0].fd, 1))
 140                                continue;
 141
 142                if (finish_command(&writer))
 143                        error_clnt("%s", deadchild);
 144                packet_flush(1);
 145                break;
 146        }
 147        return 0;
 148}