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 #define MAX_ARGS (64)
  20
  21 static int run_upload_archive(int argc, const char **argv, const char *prefix)
  22 {
  23         const char *sent_argv[MAX_ARGS];
  24         const char *arg_cmd = "argument ";
  25         char *p, buf[4096];
  26         int sent_argc;
  27         int len;
  28
  29         if (argc != 2)
  30                 usage(upload_archive_usage);
  31
  32         if (strlen(argv[1]) + 1 > sizeof(buf))
  33                 die("insanely long repository name");
  34
  35         strcpy(buf, argv[1]); /* enter-repo smudges its argument */
  36
  37         if (!enter_repo(buf, 0))
  38                 die("not a git archive");
  39
  40         /* put received options in sent_argv[] */
  41         sent_argc = 1;
  42         sent_argv[0] = "git-upload-archive";
  43         for (p = buf;;) {
  44                 /* This will die if not enough free space in buf */
  45                 len = packet_read_line(0, p, (buf + sizeof buf) - p);
  46                 if (len == 0)
  47                         break;  /* got a flush */
  48                 if (sent_argc > MAX_ARGS - 2)
  49                         die("Too many options (>%d)", MAX_ARGS - 2);
  50
  51                 if (p[len-1] == '\n') {
  52                         p[--len] = 0;
  53                 }
  54                 if (len < strlen(arg_cmd) ||
  55                     strncmp(arg_cmd, p, strlen(arg_cmd)))
  56                         die("'argument' token or flush expected");
  57
  58                 len -= strlen(arg_cmd);
  59                 memmove(p, p + strlen(arg_cmd), len);
  60                 sent_argv[sent_argc++] = p;
  61                 p += len;
  62                 *p++ = 0;
  63         }
  64         sent_argv[sent_argc] = NULL;
  65
  66         /* parse all options sent by the client */
  67         return write_archive(sent_argc, sent_argv, prefix, 0);
  68 }
  69
  70 static void error_clnt(const char *fmt, ...)
  71 {
  72         char buf[1024];
  73         va_list params;
  74         int len;
  75
  76         va_start(params, fmt);
  77         len = vsprintf(buf, fmt, params);
  78         va_end(params);
  79         send_sideband(1, 3, buf, len, LARGE_PACKET_MAX);
  80         die("sent error to the client: %s", buf);
  81 }
  82
  83 static void process_input(int child_fd, int band)
  84 {
  85         char buf[16384];
  86         ssize_t sz = read(child_fd, buf, sizeof(buf));
  87         if (sz < 0) {
  88                 if (errno != EAGAIN && errno != EINTR)
  89                         error_clnt("read error: %s\n", strerror(errno));
  90                 return;
  91         }
  92         send_sideband(1, band, buf, sz, LARGE_PACKET_MAX);
  93 }
  94
  95 int cmd_upload_archive(int argc, const char **argv, const char *prefix)
  96 {
  97         pid_t writer;
  98         int fd1[2], fd2[2];
  99         /*
 100          * Set up sideband subprocess.
 101          *
 102          * We (parent) monitor and read from child, sending its fd#1 and fd#2
 103          * multiplexed out to our fd#1.  If the child dies, we tell the other
 104          * end over channel #3.
 105          */
 106         if (pipe(fd1) < 0 || pipe(fd2) < 0) {
 107                 int err = errno;
 108                 packet_write(1, "NACK pipe failed on the remote side\n");
 109                 die("upload-archive: %s", strerror(err));
 110         }
 111         writer = fork();
 112         if (writer < 0) {
 113                 int err = errno;
 114                 packet_write(1, "NACK fork failed on the remote side\n");
 115                 die("upload-archive: %s", strerror(err));
 116         }
 117         if (!writer) {
 118                 /* child - connect fd#1 and fd#2 to the pipe */
 119                 dup2(fd1[1], 1);
 120                 dup2(fd2[1], 2);
 121                 close(fd1[1]); close(fd2[1]);
 122                 close(fd1[0]); close(fd2[0]); /* we do not read from pipe */
 123
 124                 exit(run_upload_archive(argc, argv, prefix));
 125         }
 126
 127         /* parent - read from child, multiplex and send out to fd#1 */
 128         close(fd1[1]); close(fd2[1]); /* we do not write to pipe */
 129         packet_write(1, "ACK\n");
 130         packet_flush(1);
 131
 132         while (1) {
 133                 struct pollfd pfd[2];
 134                 int status;
 135
 136                 pfd[0].fd = fd1[0];
 137                 pfd[0].events = POLLIN;
 138                 pfd[1].fd = fd2[0];
 139                 pfd[1].events = POLLIN;
 140                 if (poll(pfd, 2, -1) < 0) {
 141                         if (errno != EINTR) {
 142                                 error("poll failed resuming: %s",
 143                                       strerror(errno));
 144                                 sleep(1);
 145                         }
 146                         continue;
 147                 }
 148                 if (pfd[0].revents & POLLIN)
 149                         /* Data stream ready */
 150                         process_input(pfd[0].fd, 1);
 151                 if (pfd[1].revents & POLLIN)
 152                         /* Status stream ready */
 153                         process_input(pfd[1].fd, 2);
 154                 /* Always finish to read data when available */
 155                 if ((pfd[0].revents | pfd[1].revents) & POLLIN)
 156                         continue;
 157
 158                 if (waitpid(writer, &status, 0) < 0)
 159                         error_clnt("%s", lostchild);
 160                 else if (!WIFEXITED(status) || WEXITSTATUS(status) > 0)
 161                         error_clnt("%s", deadchild);
 162                 packet_flush(1);
 163                 break;
 164         }
 165         return 0;
 166 }