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 struct archiver *ar;
  23         struct archiver_args args;
  24         const char *sent_argv[MAX_ARGS];
  25         const char *arg_cmd = "argument ";
  26         char *p, buf[4096];
  27         int treeish_idx;
  28         int sent_argc;
  29         int len;
  30
  31         if (argc != 2)
  32                 usage(upload_archive_usage);
  33
  34         if (strlen(argv[1]) + 1 > sizeof(buf))
  35                 die("insanely long repository name");
  36
  37         strcpy(buf, argv[1]); /* enter-repo smudges its argument */
  38
  39         if (!enter_repo(buf, 0))
  40                 die("not a git archive");
  41
  42         /* put received options in sent_argv[] */
  43         sent_argc = 1;
  44         sent_argv[0] = "git-upload-archive";
  45         for (p = buf;;) {
  46                 /* This will die if not enough free space in buf */
  47                 len = packet_read_line(0, p, (buf + sizeof buf) - p);
  48                 if (len == 0)
  49                         break;  /* got a flush */
  50                 if (sent_argc > MAX_ARGS - 2)
  51                         die("Too many options (>29)");
  52
  53                 if (p[len-1] == '\n') {
  54                         p[--len] = 0;
  55                 }
  56                 if (len < strlen(arg_cmd) ||
  57                     strncmp(arg_cmd, p, strlen(arg_cmd)))
  58                         die("'argument' token or flush expected");
  59
  60                 len -= strlen(arg_cmd);
  61                 memmove(p, p + strlen(arg_cmd), len);
  62                 sent_argv[sent_argc++] = p;
  63                 p += len;
  64                 *p++ = 0;
  65         }
  66         sent_argv[sent_argc] = NULL;
  67
  68         /* parse all options sent by the client */
  69         treeish_idx = parse_archive_args(sent_argc, sent_argv, &ar, &args);
  70
  71         parse_treeish_arg(sent_argv + treeish_idx, &args, prefix);
  72         parse_pathspec_arg(sent_argv + treeish_idx + 1, &args);
  73
  74         return ar->write_archive(&args);
  75 }
  76
  77 static void error_clnt(const char *fmt, ...)
  78 {
  79         char buf[1024];
  80         va_list params;
  81         int len;
  82
  83         va_start(params, fmt);
  84         len = vsprintf(buf, fmt, params);
  85         va_end(params);
  86         send_sideband(1, 3, buf, len, LARGE_PACKET_MAX);
  87         die("sent error to the client: %s", buf);
  88 }
  89
  90 static void process_input(int child_fd, int band)
  91 {
  92         char buf[16384];
  93         ssize_t sz = read(child_fd, buf, sizeof(buf));
  94         if (sz < 0) {
  95                 if (errno != EAGAIN && errno != EINTR)
  96                         error_clnt("read error: %s\n", strerror(errno));
  97                 return;
  98         }
  99         send_sideband(1, band, buf, sz, LARGE_PACKET_MAX);
 100 }
 101
 102 int cmd_upload_archive(int argc, const char **argv, const char *prefix)
 103 {
 104         pid_t writer;
 105         int fd1[2], fd2[2];
 106         /*
 107          * Set up sideband subprocess.
 108          *
 109          * We (parent) monitor and read from child, sending its fd#1 and fd#2
 110          * multiplexed out to our fd#1.  If the child dies, we tell the other
 111          * end over channel #3.
 112          */
 113         if (pipe(fd1) < 0 || pipe(fd2) < 0) {
 114                 int err = errno;
 115                 packet_write(1, "NACK pipe failed on the remote side\n");
 116                 die("upload-archive: %s", strerror(err));
 117         }
 118         writer = fork();
 119         if (writer < 0) {
 120                 int err = errno;
 121                 packet_write(1, "NACK fork failed on the remote side\n");
 122                 die("upload-archive: %s", strerror(err));
 123         }
 124         if (!writer) {
 125                 /* child - connect fd#1 and fd#2 to the pipe */
 126                 dup2(fd1[1], 1);
 127                 dup2(fd2[1], 2);
 128                 close(fd1[1]); close(fd2[1]);
 129                 close(fd1[0]); close(fd2[0]); /* we do not read from pipe */
 130
 131                 exit(run_upload_archive(argc, argv, prefix));
 132         }
 133
 134         /* parent - read from child, multiplex and send out to fd#1 */
 135         close(fd1[1]); close(fd2[1]); /* we do not write to pipe */
 136         packet_write(1, "ACK\n");
 137         packet_flush(1);
 138
 139         while (1) {
 140                 struct pollfd pfd[2];
 141                 int status;
 142
 143                 pfd[0].fd = fd1[0];
 144                 pfd[0].events = POLLIN;
 145                 pfd[1].fd = fd2[0];
 146                 pfd[1].events = POLLIN;
 147                 if (poll(pfd, 2, -1) < 0) {
 148                         if (errno != EINTR) {
 149                                 error("poll failed resuming: %s",
 150                                       strerror(errno));
 151                                 sleep(1);
 152                         }
 153                         continue;
 154                 }
 155                 if (pfd[0].revents & POLLIN)
 156                         /* Data stream ready */
 157                         process_input(pfd[0].fd, 1);
 158                 if (pfd[1].revents & POLLIN)
 159                         /* Status stream ready */
 160                         process_input(pfd[1].fd, 2);
 161                 /* Always finish to read data when available */
 162                 if ((pfd[0].revents | pfd[1].revents) & POLLIN)
 163                         continue;
 164
 165                 if (waitpid(writer, &status, 0) < 0)
 166                         error_clnt("%s", lostchild);
 167                 else if (!WIFEXITED(status) || WEXITSTATUS(status) > 0)
 168                         error_clnt("%s", deadchild);
 169                 packet_flush(1);
 170                 break;
 171         }
 172         return 0;
 173 }