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
  11 static const char upload_archive_usage[] =
  12         "git upload-archive <repo>";
  13
  14 static const char deadchild[] =
  15 "git upload-archive: archiver died with error";
  16
  17 #define MAX_ARGS (64)
  18
  19 int 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)))
  69 static 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
  82 static 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
  95 int 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 }