builtin-upload-archive.c

   1 /*
   2  * Copyright (c) 2006 Franck Bui-Huu
   3  */
   4 #include <time.h>
   5 #include "cache.h"
   6 #include "builtin.h"
   7 #include "archive.h"
   8 #include "pkt-line.h"
   9 #include "sideband.h"
  10 #include <sys/wait.h>
  11 #include <sys/poll.h>
  12
  13 static const char upload_archive_usage[] =
  14         "git-upload-archive <repo>";
  15
  16 static const char deadchild[] =
  17 "git-upload-archive: archiver died with error";
  18
  19 static const char lostchild[] =
  20 "git-upload-archive: archiver process was lost";
  21
  22
  23 static int run_upload_archive(int argc, const char **argv, const char *prefix)
  24 {
  25         struct archiver ar;
  26         const char *sent_argv[MAX_ARGS];
  27         const char *arg_cmd = "argument ";
  28         char *p, buf[4096];
  29         int treeish_idx;
  30         int sent_argc;
  31         int len;
  32
  33         if (argc != 2)
  34                 usage(upload_archive_usage);
  35
  36         if (strlen(argv[1]) > sizeof(buf))
  37                 die("insanely long repository name");
  38
  39         strcpy(buf, argv[1]); /* enter-repo smudges its argument */
  40
  41         if (!enter_repo(buf, 0))
  42                 die("not a git archive");
  43
  44         /* put received options in sent_argv[] */
  45         sent_argc = 1;
  46         sent_argv[0] = "git-upload-archive";
  47         for (p = buf;;) {
  48                 /* This will die if not enough free space in buf */
  49                 len = packet_read_line(0, p, (buf + sizeof buf) - p);
  50                 if (len == 0)
  51                         break;  /* got a flush */
  52                 if (sent_argc > MAX_ARGS - 2)
  53                         die("Too many options (>29)");
  54
  55                 if (p[len-1] == '\n') {
  56                         p[--len] = 0;
  57                 }
  58                 if (len < strlen(arg_cmd) ||
  59                     strncmp(arg_cmd, p, strlen(arg_cmd)))
  60                         die("'argument' token or flush expected");
  61
  62                 len -= strlen(arg_cmd);
  63                 memmove(p, p + strlen(arg_cmd), len);
  64                 sent_argv[sent_argc++] = p;
  65                 p += len;
  66                 *p++ = 0;
  67         }
  68         sent_argv[sent_argc] = NULL;
  69
  70         /* parse all options sent by the client */
  71         treeish_idx = parse_archive_args(sent_argc, sent_argv, &ar);
  72
  73         parse_treeish_arg(sent_argv + treeish_idx, &ar.args, prefix);
  74         parse_pathspec_arg(sent_argv + treeish_idx + 1, &ar.args);
  75
  76         return ar.write_archive(&ar.args);
  77 }
  78
  79 static void error_clnt(const char *fmt, ...)
  80 {
  81         char buf[1024];
  82         va_list params;
  83         int len;
  84
  85         va_start(params, fmt);
  86         len = vsprintf(buf, fmt, params);
  87         va_end(params);
  88         send_sideband(1, 3, buf, len, LARGE_PACKET_MAX);
  89         die("sent error to the client: %s", buf);
  90 }
  91
  92 static void process_input(int child_fd, int band)
  93 {
  94         char buf[16384];
  95         ssize_t sz = read(child_fd, buf, sizeof(buf));
  96         if (sz < 0) {
  97                 if (errno != EINTR)
  98                         error_clnt("read error: %s\n", strerror(errno));
  99                 return;
 100         }
 101         send_sideband(1, band, buf, sz, LARGE_PACKET_MAX);
 102 }
 103
 104 int cmd_upload_archive(int argc, const char **argv, const char *prefix)
 105 {
 106         pid_t writer;
 107         int fd1[2], fd2[2];
 108         /*
 109          * Set up sideband subprocess.
 110          *
 111          * We (parent) monitor and read from child, sending its fd#1 and fd#2
 112          * multiplexed out to our fd#1.  If the child dies, we tell the other
 113          * end over channel #3.
 114          */
 115         if (pipe(fd1) < 0 || pipe(fd2) < 0) {
 116                 int err = errno;
 117                 packet_write(1, "NACK pipe failed on the remote side\n");
 118                 die("upload-archive: %s", strerror(err));
 119         }
 120         writer = fork();
 121         if (writer < 0) {
 122                 int err = errno;
 123                 packet_write(1, "NACK fork failed on the remote side\n");
 124                 die("upload-archive: %s", strerror(err));
 125         }
 126         if (!writer) {
 127                 /* child - connect fd#1 and fd#2 to the pipe */
 128                 dup2(fd1[1], 1);
 129                 dup2(fd2[1], 2);
 130                 close(fd1[1]); close(fd2[1]);
 131                 close(fd1[0]); close(fd2[0]); /* we do not read from pipe */
 132
 133                 exit(run_upload_archive(argc, argv, prefix));
 134         }
 135
 136         /* parent - read from child, multiplex and send out to fd#1 */
 137         close(fd1[1]); close(fd2[1]); /* we do not write to pipe */
 138         packet_write(1, "ACK\n");
 139         packet_flush(1);
 140
 141         while (1) {
 142                 struct pollfd pfd[2];
 143                 int status;
 144
 145                 pfd[0].fd = fd1[0];
 146                 pfd[0].events = POLLIN;
 147                 pfd[1].fd = fd2[0];
 148                 pfd[1].events = POLLIN;
 149                 if (poll(pfd, 2, -1) < 0) {
 150                         if (errno != EINTR) {
 151                                 error("poll failed resuming: %s",
 152                                       strerror(errno));
 153                                 sleep(1);
 154                         }
 155                         continue;
 156                 }
 157                 if (pfd[0].revents & POLLIN)
 158                         /* Data stream ready */
 159                         process_input(pfd[0].fd, 1);
 160                 if (pfd[1].revents & POLLIN)
 161                         /* Status stream ready */
 162                         process_input(pfd[1].fd, 2);
 163                 /* Always finish to read data when available */
 164                 if ((pfd[0].revents | pfd[1].revents) & POLLIN)
 165                         continue;
 166
 167                 if (waitpid(writer, &status, 0) < 0)
 168                         error_clnt("%s", lostchild);
 169                 else if (!WIFEXITED(status) || WEXITSTATUS(status) > 0)
 170                         error_clnt("%s", deadchild);
 171                 packet_flush(1);
 172                 break;
 173         }
 174         return 0;
 175 }