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 "strvec.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 strvec sent_argv = STRVEC_INIT;
  23         const char *arg_cmd = "argument ";
  24
  25         if (argc != 2 || !strcmp(argv[1], "-h"))
  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         init_archivers();
  32
  33         /* put received options in sent_argv[] */
  34         strvec_push(&sent_argv, "git-upload-archive");
  35         for (;;) {
  36                 char *buf = packet_read_line(0, NULL);
  37                 if (!buf)
  38                         break;  /* got a flush */
  39                 if (sent_argv.nr > MAX_ARGS)
  40                         die("Too many options (>%d)", MAX_ARGS - 1);
  41
  42                 if (!starts_with(buf, arg_cmd))
  43                         die("'argument' token or flush expected");
  44                 strvec_push(&sent_argv, buf + strlen(arg_cmd));
  45         }
  46
  47         /* parse all options sent by the client */
  48         return write_archive(sent_argv.nr, sent_argv.v, prefix,
  49                              the_repository, NULL, 1);
  50 }
  51
  52 __attribute__((format (printf, 1, 2)))
  53 static void error_clnt(const char *fmt, ...)
  54 {
  55         struct strbuf buf = STRBUF_INIT;
  56         va_list params;
  57
  58         va_start(params, fmt);
  59         strbuf_vaddf(&buf, fmt, params);
  60         va_end(params);
  61         send_sideband(1, 3, buf.buf, buf.len, LARGE_PACKET_MAX);
  62         die("sent error to the client: %s", buf.buf);
  63 }
  64
  65 static ssize_t process_input(int child_fd, int band)
  66 {
  67         char buf[16384];
  68         ssize_t sz = read(child_fd, buf, sizeof(buf));
  69         if (sz < 0) {
  70                 if (errno != EAGAIN && errno != EINTR)
  71                         error_clnt("read error: %s\n", strerror(errno));
  72                 return sz;
  73         }
  74         send_sideband(1, band, buf, sz, LARGE_PACKET_MAX);
  75         return sz;
  76 }
  77
  78 int cmd_upload_archive(int argc, const char **argv, const char *prefix)
  79 {
  80         struct child_process writer = { argv };
  81
  82         if (argc == 2 && !strcmp(argv[1], "-h"))
  83                 usage(upload_archive_usage);
  84
  85         /*
  86          * Set up sideband subprocess.
  87          *
  88          * We (parent) monitor and read from child, sending its fd#1 and fd#2
  89          * multiplexed out to our fd#1.  If the child dies, we tell the other
  90          * end over channel #3.
  91          */
  92         argv[0] = "upload-archive--writer";
  93         writer.out = writer.err = -1;
  94         writer.git_cmd = 1;
  95         if (start_command(&writer)) {
  96                 int err = errno;
  97                 packet_write_fmt(1, "NACK unable to spawn subprocess\n");
  98                 die("upload-archive: %s", strerror(err));
  99         }
 100
 101         packet_write_fmt(1, "ACK\n");
 102         packet_flush(1);
 103
 104         while (1) {
 105                 struct pollfd pfd[2];
 106
 107                 pfd[0].fd = writer.out;
 108                 pfd[0].events = POLLIN;
 109                 pfd[1].fd = writer.err;
 110                 pfd[1].events = POLLIN;
 111                 if (poll(pfd, 2, -1) < 0) {
 112                         if (errno != EINTR) {
 113                                 error_errno("poll failed resuming");
 114                                 sleep(1);
 115                         }
 116                         continue;
 117                 }
 118                 if (pfd[1].revents & POLLIN)
 119                         /* Status stream ready */
 120                         if (process_input(pfd[1].fd, 2))
 121                                 continue;
 122                 if (pfd[0].revents & POLLIN)
 123                         /* Data stream ready */
 124                         if (process_input(pfd[0].fd, 1))
 125                                 continue;
 126
 127                 if (finish_command(&writer))
 128                         error_clnt("%s", deadchild);
 129                 packet_flush(1);
 130                 break;
 131         }
 132         return 0;
 133 }