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