builtin/upload-archive.c

   1 /*
   2  * Copyright (c) 2006 Franck Bui-Huu
   3  */
   4 #define USE_THE_REPOSITORY_VARIABLE
   5 #include "builtin.h"
   6 #include "archive.h"
   7 #include "path.h"
   8 #include "pkt-line.h"
   9 #include "sideband.h"
  10 #include "run-command.h"
  11 #include "strvec.h"
  12
  13 static const char upload_archive_usage[] =
  14         "git upload-archive <repository>";
  15
  16 static const char deadchild[] =
  17 "git upload-archive: archiver died with error";
  18
  19 #define MAX_ARGS (64)
  20
  21 int cmd_upload_archive_writer(int argc,
  22                               const char **argv,
  23                               const char *prefix,
  24                               struct repository *repo UNUSED)
  25 {
  26         struct strvec sent_argv = STRVEC_INIT;
  27         const char *arg_cmd = "argument ";
  28         int ret;
  29
  30         if (argc != 2 || !strcmp(argv[1], "-h"))
  31                 usage(upload_archive_usage);
  32
  33         if (!enter_repo(argv[1], 0))
  34                 die("'%s' does not appear to be a git repository", argv[1]);
  35
  36         init_archivers();
  37
  38         /* put received options in sent_argv[] */
  39         strvec_push(&sent_argv, "git-upload-archive");
  40         for (;;) {
  41                 char *buf = packet_read_line(0, NULL);
  42                 if (!buf)
  43                         break;  /* got a flush */
  44                 if (sent_argv.nr > MAX_ARGS)
  45                         die("Too many options (>%d)", MAX_ARGS - 1);
  46
  47                 if (!starts_with(buf, arg_cmd))
  48                         die("'argument' token or flush expected");
  49                 strvec_push(&sent_argv, buf + strlen(arg_cmd));
  50         }
  51
  52         /* parse all options sent by the client */
  53         ret = write_archive(sent_argv.nr, sent_argv.v, prefix,
  54                             the_repository, NULL, 1);
  55
  56         strvec_clear(&sent_argv);
  57         return ret;
  58 }
  59
  60 __attribute__((format (printf, 1, 2)))
  61 static void error_clnt(const char *fmt, ...)
  62 {
  63         struct strbuf buf = STRBUF_INIT;
  64         va_list params;
  65
  66         va_start(params, fmt);
  67         strbuf_vaddf(&buf, fmt, params);
  68         va_end(params);
  69         send_sideband(1, 3, buf.buf, buf.len, LARGE_PACKET_MAX);
  70         die("sent error to the client: %s", buf.buf);
  71 }
  72
  73 static ssize_t process_input(int child_fd, int band)
  74 {
  75         char buf[16384];
  76         ssize_t sz = read(child_fd, buf, sizeof(buf));
  77         if (sz < 0) {
  78                 if (errno != EAGAIN && errno != EINTR)
  79                         error_clnt("read error: %s\n", strerror(errno));
  80                 return sz;
  81         }
  82         send_sideband(1, band, buf, sz, LARGE_PACKET_MAX);
  83         return sz;
  84 }
  85
  86 int cmd_upload_archive(int argc,
  87 const char **argv,
  88 const char *prefix,
  89 struct repository *repo UNUSED)
  90 {
  91         struct child_process writer = CHILD_PROCESS_INIT;
  92
  93         BUG_ON_NON_EMPTY_PREFIX(prefix);
  94
  95         if (argc == 2 && !strcmp(argv[1], "-h"))
  96                 usage(upload_archive_usage);
  97
  98         /*
  99          * Set up sideband subprocess.
 100          *
 101          * We (parent) monitor and read from child, sending its fd#1 and fd#2
 102          * multiplexed out to our fd#1.  If the child dies, we tell the other
 103          * end over channel #3.
 104          */
 105         writer.out = writer.err = -1;
 106         writer.git_cmd = 1;
 107         strvec_push(&writer.args, "upload-archive--writer");
 108         strvec_pushv(&writer.args, argv + 1);
 109         if (start_command(&writer)) {
 110                 int err = errno;
 111                 packet_write_fmt(1, "NACK unable to spawn subprocess\n");
 112                 die("upload-archive: %s", strerror(err));
 113         }
 114
 115         packet_write_fmt(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_errno("poll failed resuming");
 128                                 sleep(1);
 129                         }
 130                         continue;
 131                 }
 132                 if (pfd[1].revents & POLLIN)
 133                         /* Status stream ready */
 134                         if (process_input(pfd[1].fd, 2))
 135                                 continue;
 136                 if (pfd[0].revents & POLLIN)
 137                         /* Data stream ready */
 138                         if (process_input(pfd[0].fd, 1))
 139                                 continue;
 140
 141                 if (finish_command(&writer))
 142                         error_clnt("%s", deadchild);
 143                 packet_flush(1);
 144                 break;
 145         }
 146         return 0;
 147 }