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
  25         if (argc != 2)
  26                 usage(upload_archive_usage);
  27
  28         if (!enter_repo(argv[1], 0))
  29                 die("'%s' does not appear to be a git repository", argv[1]);
  30
  31         /* put received options in sent_argv[] */
  32         argv_array_push(&sent_argv, "git-upload-archive");
  33         for (;;) {
  34                 char *buf = packet_read_line(0, NULL);
  35                 if (!buf)
  36                         break;  /* got a flush */
  37                 if (sent_argv.argc > MAX_ARGS)
  38                         die("Too many options (>%d)", MAX_ARGS - 1);
  39
  40                 if (!starts_with(buf, arg_cmd))
  41                         die("'argument' token or flush expected");
  42                 argv_array_push(&sent_argv, buf + strlen(arg_cmd));
  43         }
  44
  45         /* parse all options sent by the client */
  46         return write_archive(sent_argv.argc, sent_argv.argv, prefix, 0, NULL, 1);
  47 }
  48
  49 __attribute__((format (printf, 1, 2)))
  50 static void error_clnt(const char *fmt, ...)
  51 {
  52         struct strbuf buf = STRBUF_INIT;
  53         va_list params;
  54
  55         va_start(params, fmt);
  56         strbuf_vaddf(&buf, fmt, params);
  57         va_end(params);
  58         send_sideband(1, 3, buf.buf, buf.len, LARGE_PACKET_MAX);
  59         die("sent error to the client: %s", buf.buf);
  60 }
  61
  62 static ssize_t process_input(int child_fd, int band)
  63 {
  64         char buf[16384];
  65         ssize_t sz = read(child_fd, buf, sizeof(buf));
  66         if (sz < 0) {
  67                 if (errno != EAGAIN && errno != EINTR)
  68                         error_clnt("read error: %s\n", strerror(errno));
  69                 return sz;
  70         }
  71         send_sideband(1, band, buf, sz, LARGE_PACKET_MAX);
  72         return sz;
  73 }
  74
  75 int cmd_upload_archive(int argc, const char **argv, const char *prefix)
  76 {
  77         struct child_process writer = { argv };
  78
  79         /*
  80          * Set up sideband subprocess.
  81          *
  82          * We (parent) monitor and read from child, sending its fd#1 and fd#2
  83          * multiplexed out to our fd#1.  If the child dies, we tell the other
  84          * end over channel #3.
  85          */
  86         argv[0] = "upload-archive--writer";
  87         writer.out = writer.err = -1;
  88         writer.git_cmd = 1;
  89         if (start_command(&writer)) {
  90                 int err = errno;
  91                 packet_write(1, "NACK unable to spawn subprocess\n");
  92                 die("upload-archive: %s", strerror(err));
  93         }
  94
  95         packet_write(1, "ACK\n");
  96         packet_flush(1);
  97
  98         while (1) {
  99                 struct pollfd pfd[2];
 100
 101                 pfd[0].fd = writer.out;
 102                 pfd[0].events = POLLIN;
 103                 pfd[1].fd = writer.err;
 104                 pfd[1].events = POLLIN;
 105                 if (poll(pfd, 2, -1) < 0) {
 106                         if (errno != EINTR) {
 107                                 error_errno("poll failed resuming");
 108                                 sleep(1);
 109                         }
 110                         continue;
 111                 }
 112                 if (pfd[1].revents & POLLIN)
 113                         /* Status stream ready */
 114                         if (process_input(pfd[1].fd, 2))
 115                                 continue;
 116                 if (pfd[0].revents & POLLIN)
 117                         /* Data stream ready */
 118                         if (process_input(pfd[0].fd, 1))
 119                                 continue;
 120
 121                 if (finish_command(&writer))
 122                         error_clnt("%s", deadchild);
 123                 packet_flush(1);
 124                 break;
 125         }
 126         return 0;
 127 }