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
  26         if (argc != 2 || !strcmp(argv[1], "-h"))
  27                 usage(upload_archive_usage);
  28
  29         if (!enter_repo(argv[1], 0))
  30                 die("'%s' does not appear to be a git repository", argv[1]);
  31
  32         init_archivers();
  33
  34         /* put received options in sent_argv[] */
  35         strvec_push(&sent_argv, "git-upload-archive");
  36         for (;;) {
  37                 char *buf = packet_read_line(0, NULL);
  38                 if (!buf)
  39                         break;  /* got a flush */
  40                 if (sent_argv.nr > MAX_ARGS)
  41                         die("Too many options (>%d)", MAX_ARGS - 1);
  42
  43                 if (!starts_with(buf, arg_cmd))
  44                         die("'argument' token or flush expected");
  45                 strvec_push(&sent_argv, buf + strlen(arg_cmd));
  46         }
  47
  48         /* parse all options sent by the client */
  49         return write_archive(sent_argv.nr, sent_argv.v, prefix,
  50                              the_repository, NULL, 1);
  51 }
  52
  53 __attribute__((format (printf, 1, 2)))
  54 static void error_clnt(const char *fmt, ...)
  55 {
  56         struct strbuf buf = STRBUF_INIT;
  57         va_list params;
  58
  59         va_start(params, fmt);
  60         strbuf_vaddf(&buf, fmt, params);
  61         va_end(params);
  62         send_sideband(1, 3, buf.buf, buf.len, LARGE_PACKET_MAX);
  63         die("sent error to the client: %s", buf.buf);
  64 }
  65
  66 static ssize_t process_input(int child_fd, int band)
  67 {
  68         char buf[16384];
  69         ssize_t sz = read(child_fd, buf, sizeof(buf));
  70         if (sz < 0) {
  71                 if (errno != EAGAIN && errno != EINTR)
  72                         error_clnt("read error: %s\n", strerror(errno));
  73                 return sz;
  74         }
  75         send_sideband(1, band, buf, sz, LARGE_PACKET_MAX);
  76         return sz;
  77 }
  78
  79 int cmd_upload_archive(int argc, const char **argv, const char *prefix)
  80 {
  81         struct child_process writer = CHILD_PROCESS_INIT;
  82
  83         BUG_ON_NON_EMPTY_PREFIX(prefix);
  84
  85         if (argc == 2 && !strcmp(argv[1], "-h"))
  86                 usage(upload_archive_usage);
  87
  88         /*
  89          * Set up sideband subprocess.
  90          *
  91          * We (parent) monitor and read from child, sending its fd#1 and fd#2
  92          * multiplexed out to our fd#1.  If the child dies, we tell the other
  93          * end over channel #3.
  94          */
  95         writer.out = writer.err = -1;
  96         writer.git_cmd = 1;
  97         strvec_push(&writer.args, "upload-archive--writer");
  98         strvec_pushv(&writer.args, argv + 1);
  99         if (start_command(&writer)) {
 100                 int err = errno;
 101                 packet_write_fmt(1, "NACK unable to spawn subprocess\n");
 102                 die("upload-archive: %s", strerror(err));
 103         }
 104
 105         packet_write_fmt(1, "ACK\n");
 106         packet_flush(1);
 107
 108         while (1) {
 109                 struct pollfd pfd[2];
 110
 111                 pfd[0].fd = writer.out;
 112                 pfd[0].events = POLLIN;
 113                 pfd[1].fd = writer.err;
 114                 pfd[1].events = POLLIN;
 115                 if (poll(pfd, 2, -1) < 0) {
 116                         if (errno != EINTR) {
 117                                 error_errno("poll failed resuming");
 118                                 sleep(1);
 119                         }
 120                         continue;
 121                 }
 122                 if (pfd[1].revents & POLLIN)
 123                         /* Status stream ready */
 124                         if (process_input(pfd[1].fd, 2))
 125                                 continue;
 126                 if (pfd[0].revents & POLLIN)
 127                         /* Data stream ready */
 128                         if (process_input(pfd[0].fd, 1))
 129                                 continue;
 130
 131                 if (finish_command(&writer))
 132                         error_clnt("%s", deadchild);
 133                 packet_flush(1);
 134                 break;
 135         }
 136         return 0;
 137 }