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
  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 (!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)))
  64 static 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
  77 static 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
  90 int 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 }