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         struct archiver ar;
  23         const char *sent_argv[MAX_ARGS];
  24         const char *arg_cmd = "argument ";
  25         char *p, buf[4096];
  26         int treeish_idx;
  27         int sent_argc;
  28         int len;
  29
  30         if (argc != 2)
  31                 usage(upload_archive_usage);
  32
  33         if (strlen(argv[1]) > sizeof(buf))
  34                 die("insanely long repository name");
  35
  36         strcpy(buf, argv[1]); /* enter-repo smudges its argument */
  37
  38         if (!enter_repo(buf, 0))
  39                 die("not a git archive");
  40
  41         /* put received options in sent_argv[] */
  42         sent_argc = 1;
  43         sent_argv[0] = "git-upload-archive";
  44         for (p = buf;;) {
  45                 /* This will die if not enough free space in buf */
  46                 len = packet_read_line(0, p, (buf + sizeof buf) - p);
  47                 if (len == 0)
  48                         break;  /* got a flush */
  49                 if (sent_argc > MAX_ARGS - 2)
  50                         die("Too many options (>29)");
  51
  52                 if (p[len-1] == '\n') {
  53                         p[--len] = 0;
  54                 }
  55                 if (len < strlen(arg_cmd) ||
  56                     strncmp(arg_cmd, p, strlen(arg_cmd)))
  57                         die("'argument' token or flush expected");
  58
  59                 len -= strlen(arg_cmd);
  60                 memmove(p, p + strlen(arg_cmd), len);
  61                 sent_argv[sent_argc++] = p;
  62                 p += len;
  63                 *p++ = 0;
  64         }
  65         sent_argv[sent_argc] = NULL;
  66
  67         /* parse all options sent by the client */
  68         treeish_idx = parse_archive_args(sent_argc, sent_argv, &ar);
  69
  70         parse_treeish_arg(sent_argv + treeish_idx, &ar.args, prefix);
  71         parse_pathspec_arg(sent_argv + treeish_idx + 1, &ar.args);
  72
  73         return ar.write_archive(&ar.args);
  74 }
  75
  76 static void error_clnt(const char *fmt, ...)
  77 {
  78         char buf[1024];
  79         va_list params;
  80         int len;
  81
  82         va_start(params, fmt);
  83         len = vsprintf(buf, fmt, params);
  84         va_end(params);
  85         send_sideband(1, 3, buf, len, LARGE_PACKET_MAX);
  86         die("sent error to the client: %s", buf);
  87 }
  88
  89 static void process_input(int child_fd, int band)
  90 {
  91         char buf[16384];
  92         ssize_t sz = read(child_fd, buf, sizeof(buf));
  93         if (sz < 0) {
  94                 if (errno != EAGAIN && errno != EINTR)
  95                         error_clnt("read error: %s\n", strerror(errno));
  96                 return;
  97         }
  98         send_sideband(1, band, buf, sz, LARGE_PACKET_MAX);
  99 }
 100
 101 int cmd_upload_archive(int argc, const char **argv, const char *prefix)
 102 {
 103         pid_t writer;
 104         int fd1[2], fd2[2];
 105         /*
 106          * Set up sideband subprocess.
 107          *
 108          * We (parent) monitor and read from child, sending its fd#1 and fd#2
 109          * multiplexed out to our fd#1.  If the child dies, we tell the other
 110          * end over channel #3.
 111          */
 112         if (pipe(fd1) < 0 || pipe(fd2) < 0) {
 113                 int err = errno;
 114                 packet_write(1, "NACK pipe failed on the remote side\n");
 115                 die("upload-archive: %s", strerror(err));
 116         }
 117         writer = fork();
 118         if (writer < 0) {
 119                 int err = errno;
 120                 packet_write(1, "NACK fork failed on the remote side\n");
 121                 die("upload-archive: %s", strerror(err));
 122         }
 123         if (!writer) {
 124                 /* child - connect fd#1 and fd#2 to the pipe */
 125                 dup2(fd1[1], 1);
 126                 dup2(fd2[1], 2);
 127                 close(fd1[1]); close(fd2[1]);
 128                 close(fd1[0]); close(fd2[0]); /* we do not read from pipe */
 129
 130                 exit(run_upload_archive(argc, argv, prefix));
 131         }
 132
 133         /* parent - read from child, multiplex and send out to fd#1 */
 134         close(fd1[1]); close(fd2[1]); /* we do not write to pipe */
 135         packet_write(1, "ACK\n");
 136         packet_flush(1);
 137
 138         while (1) {
 139                 struct pollfd pfd[2];
 140                 int status;
 141
 142                 pfd[0].fd = fd1[0];
 143                 pfd[0].events = POLLIN;
 144                 pfd[1].fd = fd2[0];
 145                 pfd[1].events = POLLIN;
 146                 if (poll(pfd, 2, -1) < 0) {
 147                         if (errno != EINTR) {
 148                                 error("poll failed resuming: %s",
 149                                       strerror(errno));
 150                                 sleep(1);
 151                         }
 152                         continue;
 153                 }
 154                 if (pfd[0].revents & POLLIN)
 155                         /* Data stream ready */
 156                         process_input(pfd[0].fd, 1);
 157                 if (pfd[1].revents & POLLIN)
 158                         /* Status stream ready */
 159                         process_input(pfd[1].fd, 2);
 160                 /* Always finish to read data when available */
 161                 if ((pfd[0].revents | pfd[1].revents) & POLLIN)
 162                         continue;
 163
 164                 if (waitpid(writer, &status, 0) < 0)
 165                         error_clnt("%s", lostchild);
 166                 else if (!WIFEXITED(status) || WEXITSTATUS(status) > 0)
 167                         error_clnt("%s", deadchild);
 168                 packet_flush(1);
 169                 break;
 170         }
 171         return 0;
 172 }