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
  10static const char upload_archive_usage[] =
  11        "git upload-archive <repo>";
  12
  13static const char deadchild[] =
  14"git upload-archive: archiver died with error";
  15
  16static const char lostchild[] =
  17"git upload-archive: archiver process was lost";
  18
  19#define MAX_ARGS (64)
  20
  21static int run_upload_archive(int argc, const char **argv, const char *prefix)
  22{
  23        const char *sent_argv[MAX_ARGS];
  24        const char *arg_cmd = "argument ";
  25        char *p, buf[4096];
  26        int sent_argc;
  27        int len;
  28
  29        if (argc != 2)
  30                usage(upload_archive_usage);
  31
  32        if (strlen(argv[1]) + 1 > sizeof(buf))
  33                die("insanely long repository name");
  34
  35        strcpy(buf, argv[1]); /* enter-repo smudges its argument */
  36
  37        if (!enter_repo(buf, 0))
  38                die("'%s' does not appear to be a git repository", buf);
  39
  40        /* put received options in sent_argv[] */
  41        sent_argc = 1;
  42        sent_argv[0] = "git-upload-archive";
  43        for (p = buf;;) {
  44                /* This will die if not enough free space in buf */
  45                len = packet_read_line(0, p, (buf + sizeof buf) - p);
  46                if (len == 0)
  47                        break;  /* got a flush */
  48                if (sent_argc > MAX_ARGS - 2)
  49                        die("Too many options (>%d)", MAX_ARGS - 2);
  50
  51                if (p[len-1] == '\n') {
  52                        p[--len] = 0;
  53                }
  54                if (len < strlen(arg_cmd) ||
  55                    strncmp(arg_cmd, p, strlen(arg_cmd)))
  56                        die("'argument' token or flush expected");
  57
  58                len -= strlen(arg_cmd);
  59                memmove(p, p + strlen(arg_cmd), len);
  60                sent_argv[sent_argc++] = p;
  61                p += len;
  62                *p++ = 0;
  63        }
  64        sent_argv[sent_argc] = NULL;
  65
  66        /* parse all options sent by the client */
  67        return write_archive(sent_argc, sent_argv, prefix, 0);
  68}
  69
  70__attribute__((format (printf, 1, 2)))
  71static void error_clnt(const char *fmt, ...)
  72{
  73        char buf[1024];
  74        va_list params;
  75        int len;
  76
  77        va_start(params, fmt);
  78        len = vsprintf(buf, fmt, params);
  79        va_end(params);
  80        send_sideband(1, 3, buf, len, LARGE_PACKET_MAX);
  81        die("sent error to the client: %s", buf);
  82}
  83
  84static ssize_t process_input(int child_fd, int band)
  85{
  86        char buf[16384];
  87        ssize_t sz = read(child_fd, buf, sizeof(buf));
  88        if (sz < 0) {
  89                if (errno != EAGAIN && errno != EINTR)
  90                        error_clnt("read error: %s\n", strerror(errno));
  91                return sz;
  92        }
  93        send_sideband(1, band, buf, sz, LARGE_PACKET_MAX);
  94        return sz;
  95}
  96
  97int cmd_upload_archive(int argc, const char **argv, const char *prefix)
  98{
  99        pid_t writer;
 100        int fd1[2], fd2[2];
 101        /*
 102         * Set up sideband subprocess.
 103         *
 104         * We (parent) monitor and read from child, sending its fd#1 and fd#2
 105         * multiplexed out to our fd#1.  If the child dies, we tell the other
 106         * end over channel #3.
 107         */
 108        if (pipe(fd1) < 0 || pipe(fd2) < 0) {
 109                int err = errno;
 110                packet_write(1, "NACK pipe failed on the remote side\n");
 111                die("upload-archive: %s", strerror(err));
 112        }
 113        writer = fork();
 114        if (writer < 0) {
 115                int err = errno;
 116                packet_write(1, "NACK fork failed on the remote side\n");
 117                die("upload-archive: %s", strerror(err));
 118        }
 119        if (!writer) {
 120                /* child - connect fd#1 and fd#2 to the pipe */
 121                dup2(fd1[1], 1);
 122                dup2(fd2[1], 2);
 123                close(fd1[1]); close(fd2[1]);
 124                close(fd1[0]); close(fd2[0]); /* we do not read from pipe */
 125
 126                exit(run_upload_archive(argc, argv, prefix));
 127        }
 128
 129        /* parent - read from child, multiplex and send out to fd#1 */
 130        close(fd1[1]); close(fd2[1]); /* we do not write to pipe */
 131        packet_write(1, "ACK\n");
 132        packet_flush(1);
 133
 134        while (1) {
 135                struct pollfd pfd[2];
 136                int status;
 137
 138                pfd[0].fd = fd1[0];
 139                pfd[0].events = POLLIN;
 140                pfd[1].fd = fd2[0];
 141                pfd[1].events = POLLIN;
 142                if (poll(pfd, 2, -1) < 0) {
 143                        if (errno != EINTR) {
 144                                error("poll failed resuming: %s",
 145                                      strerror(errno));
 146                                sleep(1);
 147                        }
 148                        continue;
 149                }
 150                if (pfd[1].revents & POLLIN)
 151                        /* Status stream ready */
 152                        if (process_input(pfd[1].fd, 2))
 153                                continue;
 154                if (pfd[0].revents & POLLIN)
 155                        /* Data stream ready */
 156                        if (process_input(pfd[0].fd, 1))
 157                                continue;
 158
 159                if (waitpid(writer, &status, 0) < 0)
 160                        error_clnt("%s", lostchild);
 161                else if (!WIFEXITED(status) || WEXITSTATUS(status) > 0)
 162                        error_clnt("%s", deadchild);
 163                packet_flush(1);
 164                break;
 165        }
 166        return 0;
 167}