builtin/upload-archive.c

   1 /*
   2  * Copyright (c) 2006 Franck Bui-Huu
   3  */
   4 #include "builtin.h"
   5 #include "archive.h"
   6 #include "path.h"
   7 #include "pkt-line.h"
   8 #include "sideband.h"
   9 #include "repository.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, const char **argv, const char *prefix)
  22 {
  23         struct strvec sent_argv = STRVEC_INIT;
  24         const char *arg_cmd = "argument ";
  25         int ret;
  26
  27         if (argc != 2 || !strcmp(argv[1], "-h"))
  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         init_archivers();
  34
  35         /* put received options in sent_argv[] */
  36         strvec_push(&sent_argv, "git-upload-archive");
  37         for (;;) {
  38                 char *buf = packet_read_line(0, NULL);
  39                 if (!buf)
  40                         break;  /* got a flush */
  41                 if (sent_argv.nr > MAX_ARGS)
  42                         die("Too many options (>%d)", MAX_ARGS - 1);
  43
  44                 if (!starts_with(buf, arg_cmd))
  45                         die("'argument' token or flush expected");
  46                 strvec_push(&sent_argv, buf + strlen(arg_cmd));
  47         }
  48
  49         /* parse all options sent by the client */
  50         ret = write_archive(sent_argv.nr, sent_argv.v, prefix,
  51                             the_repository, NULL, 1);
  52
  53         strvec_clear(&sent_argv);
  54         return ret;
  55 }
  56
  57 __attribute__((format (printf, 1, 2)))
  58 static void error_clnt(const char *fmt, ...)
  59 {
  60         struct strbuf buf = STRBUF_INIT;
  61         va_list params;
  62
  63         va_start(params, fmt);
  64         strbuf_vaddf(&buf, fmt, params);
  65         va_end(params);
  66         send_sideband(1, 3, buf.buf, buf.len, LARGE_PACKET_MAX);
  67         die("sent error to the client: %s", buf.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 = CHILD_PROCESS_INIT;
  86
  87         BUG_ON_NON_EMPTY_PREFIX(prefix);
  88
  89         if (argc == 2 && !strcmp(argv[1], "-h"))
  90                 usage(upload_archive_usage);
  91
  92         /*
  93          * Set up sideband subprocess.
  94          *
  95          * We (parent) monitor and read from child, sending its fd#1 and fd#2
  96          * multiplexed out to our fd#1.  If the child dies, we tell the other
  97          * end over channel #3.
  98          */
  99         writer.out = writer.err = -1;
 100         writer.git_cmd = 1;
 101         strvec_push(&writer.args, "upload-archive--writer");
 102         strvec_pushv(&writer.args, argv + 1);
 103         if (start_command(&writer)) {
 104                 int err = errno;
 105                 packet_write_fmt(1, "NACK unable to spawn subprocess\n");
 106                 die("upload-archive: %s", strerror(err));
 107         }
 108
 109         packet_write_fmt(1, "ACK\n");
 110         packet_flush(1);
 111
 112         while (1) {
 113                 struct pollfd pfd[2];
 114
 115                 pfd[0].fd = writer.out;
 116                 pfd[0].events = POLLIN;
 117                 pfd[1].fd = writer.err;
 118                 pfd[1].events = POLLIN;
 119                 if (poll(pfd, 2, -1) < 0) {
 120                         if (errno != EINTR) {
 121                                 error_errno("poll failed resuming");
 122                                 sleep(1);
 123                         }
 124                         continue;
 125                 }
 126                 if (pfd[1].revents & POLLIN)
 127                         /* Status stream ready */
 128                         if (process_input(pfd[1].fd, 2))
 129                                 continue;
 130                 if (pfd[0].revents & POLLIN)
 131                         /* Data stream ready */
 132                         if (process_input(pfd[0].fd, 1))
 133                                 continue;
 134
 135                 if (finish_command(&writer))
 136                         error_clnt("%s", deadchild);
 137                 packet_flush(1);
 138                 break;
 139         }
 140         return 0;
 141 }