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
  10 static const char upload_archive_usage[] =
  11         "git upload-archive <repo>";
  12
  13 static const char deadchild[] =
  14 "git upload-archive: archiver died with error";
  15
  16 static const char lostchild[] =
  17 "git upload-archive: archiver process was lost";
  18
  19
  20 static int run_upload_archive(int argc, const char **argv, const char *prefix)
  21 {
  22         const char *sent_argv[MAX_ARGS];
  23         const char *arg_cmd = "argument ";
  24         char *p, buf[4096];
  25         int sent_argc;
  26         int len;
  27
  28         if (argc != 2)
  29                 usage(upload_archive_usage);
  30
  31         if (strlen(argv[1]) + 1 > sizeof(buf))
  32                 die("insanely long repository name");
  33
  34         strcpy(buf, argv[1]); /* enter-repo smudges its argument */
  35
  36         if (!enter_repo(buf, 0))
  37                 die("not a git archive");
  38
  39         /* put received options in sent_argv[] */
  40         sent_argc = 1;
  41         sent_argv[0] = "git-upload-archive";
  42         for (p = buf;;) {
  43                 /* This will die if not enough free space in buf */
  44                 len = packet_read_line(0, p, (buf + sizeof buf) - p);
  45                 if (len == 0)
  46                         break;  /* got a flush */
  47                 if (sent_argc > MAX_ARGS - 2)
  48                         die("Too many options (>29)");
  49
  50                 if (p[len-1] == '\n') {
  51                         p[--len] = 0;
  52                 }
  53                 if (len < strlen(arg_cmd) ||
  54                     strncmp(arg_cmd, p, strlen(arg_cmd)))
  55                         die("'argument' token or flush expected");
  56
  57                 len -= strlen(arg_cmd);
  58                 memmove(p, p + strlen(arg_cmd), len);
  59                 sent_argv[sent_argc++] = p;
  60                 p += len;
  61                 *p++ = 0;
  62         }
  63         sent_argv[sent_argc] = NULL;
  64
  65         /* parse all options sent by the client */
  66         return write_archive(sent_argc, sent_argv, prefix, 0);
  67 }
  68
  69 static void error_clnt(const char *fmt, ...)
  70 {
  71         char buf[1024];
  72         va_list params;
  73         int len;
  74
  75         va_start(params, fmt);
  76         len = vsprintf(buf, fmt, params);
  77         va_end(params);
  78         send_sideband(1, 3, buf, len, LARGE_PACKET_MAX);
  79         die("sent error to the client: %s", buf);
  80 }
  81
  82 static void process_input(int child_fd, int band)
  83 {
  84         char buf[16384];
  85         ssize_t sz = read(child_fd, buf, sizeof(buf));
  86         if (sz < 0) {
  87                 if (errno != EAGAIN && errno != EINTR)
  88                         error_clnt("read error: %s\n", strerror(errno));
  89                 return;
  90         }
  91         send_sideband(1, band, buf, sz, LARGE_PACKET_MAX);
  92 }
  93
  94 int cmd_upload_archive(int argc, const char **argv, const char *prefix)
  95 {
  96         pid_t writer;
  97         int fd1[2], fd2[2];
  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         if (pipe(fd1) < 0 || pipe(fd2) < 0) {
 106                 int err = errno;
 107                 packet_write(1, "NACK pipe failed on the remote side\n");
 108                 die("upload-archive: %s", strerror(err));
 109         }
 110         writer = fork();
 111         if (writer < 0) {
 112                 int err = errno;
 113                 packet_write(1, "NACK fork failed on the remote side\n");
 114                 die("upload-archive: %s", strerror(err));
 115         }
 116         if (!writer) {
 117                 /* child - connect fd#1 and fd#2 to the pipe */
 118                 dup2(fd1[1], 1);
 119                 dup2(fd2[1], 2);
 120                 close(fd1[1]); close(fd2[1]);
 121                 close(fd1[0]); close(fd2[0]); /* we do not read from pipe */
 122
 123                 exit(run_upload_archive(argc, argv, prefix));
 124         }
 125
 126         /* parent - read from child, multiplex and send out to fd#1 */
 127         close(fd1[1]); close(fd2[1]); /* we do not write to pipe */
 128         packet_write(1, "ACK\n");
 129         packet_flush(1);
 130
 131         while (1) {
 132                 struct pollfd pfd[2];
 133                 int status;
 134
 135                 pfd[0].fd = fd1[0];
 136                 pfd[0].events = POLLIN;
 137                 pfd[1].fd = fd2[0];
 138                 pfd[1].events = POLLIN;
 139                 if (poll(pfd, 2, -1) < 0) {
 140                         if (errno != EINTR) {
 141                                 error("poll failed resuming: %s",
 142                                       strerror(errno));
 143                                 sleep(1);
 144                         }
 145                         continue;
 146                 }
 147                 if (pfd[0].revents & POLLIN)
 148                         /* Data stream ready */
 149                         process_input(pfd[0].fd, 1);
 150                 if (pfd[1].revents & POLLIN)
 151                         /* Status stream ready */
 152                         process_input(pfd[1].fd, 2);
 153                 /* Always finish to read data when available */
 154                 if ((pfd[0].revents | pfd[1].revents) & POLLIN)
 155                         continue;
 156
 157                 if (waitpid(writer, &status, 0) < 0)
 158                         error_clnt("%s", lostchild);
 159                 else if (!WIFEXITED(status) || WEXITSTATUS(status) > 0)
 160                         error_clnt("%s", deadchild);
 161                 packet_flush(1);
 162                 break;
 163         }
 164         return 0;
 165 }