builtin/archive.c

   1 /*
   2  * Copyright (c) 2006 Franck Bui-Huu
   3  * Copyright (c) 2006 Rene Scharfe
   4  */
   5 #include "builtin.h"
   6 #include "archive.h"
   7 #include "gettext.h"
   8 #include "transport.h"
   9 #include "parse-options.h"
  10 #include "pkt-line.h"
  11 #include "repository.h"
  12 #include "sideband.h"
  13
  14 static void create_output_file(const char *output_file)
  15 {
  16         int output_fd = xopen(output_file, O_CREAT | O_WRONLY | O_TRUNC, 0666);
  17         if (output_fd != 1) {
  18                 if (dup2(output_fd, 1) < 0)
  19                         die_errno(_("could not redirect output"));
  20                 else
  21                         close(output_fd);
  22         }
  23 }
  24
  25 static int run_remote_archiver(int argc, const char **argv,
  26                                const char *remote, const char *exec,
  27                                const char *name_hint)
  28 {
  29         int fd[2], i, rv;
  30         struct transport *transport;
  31         struct remote *_remote;
  32         struct packet_reader reader;
  33
  34         _remote = remote_get(remote);
  35         if (!_remote->url[0])
  36                 die(_("git archive: Remote with no URL"));
  37         transport = transport_get(_remote, _remote->url[0]);
  38         transport_connect(transport, "git-upload-archive", exec, fd);
  39
  40         /*
  41          * Inject a fake --format field at the beginning of the
  42          * arguments, with the format inferred from our output
  43          * filename. This way explicit --format options can override
  44          * it.
  45          */
  46         if (name_hint) {
  47                 const char *format = archive_format_from_filename(name_hint);
  48                 if (format)
  49                         packet_write_fmt(fd[1], "argument --format=%s\n", format);
  50         }
  51         for (i = 1; i < argc; i++)
  52                 packet_write_fmt(fd[1], "argument %s\n", argv[i]);
  53         packet_flush(fd[1]);
  54
  55         packet_reader_init(&reader, fd[0], NULL, 0,
  56                            PACKET_READ_CHOMP_NEWLINE |
  57                            PACKET_READ_DIE_ON_ERR_PACKET);
  58
  59         if (packet_reader_read(&reader) != PACKET_READ_NORMAL)
  60                 die(_("git archive: expected ACK/NAK, got a flush packet"));
  61         if (strcmp(reader.line, "ACK")) {
  62                 if (starts_with(reader.line, "NACK "))
  63                         die(_("git archive: NACK %s"), reader.line + 5);
  64                 die(_("git archive: protocol error"));
  65         }
  66
  67         if (packet_reader_read(&reader) != PACKET_READ_FLUSH)
  68                 die(_("git archive: expected a flush"));
  69
  70         /* Now, start reading from fd[0] and spit it out to stdout */
  71         rv = recv_sideband("archive", fd[0], 1);
  72         rv |= transport_disconnect(transport);
  73
  74         return !!rv;
  75 }
  76
  77 #define PARSE_OPT_KEEP_ALL ( PARSE_OPT_KEEP_DASHDASH |  \
  78                              PARSE_OPT_KEEP_ARGV0 |     \
  79                              PARSE_OPT_KEEP_UNKNOWN_OPT |       \
  80                              PARSE_OPT_NO_INTERNAL_HELP )
  81
  82 int cmd_archive(int argc, const char **argv, const char *prefix)
  83 {
  84         const char *exec = "git-upload-archive";
  85         char *output = NULL;
  86         const char *remote = NULL;
  87         struct option local_opts[] = {
  88                 OPT_FILENAME('o', "output", &output,
  89                              N_("write the archive to this file")),
  90                 OPT_STRING(0, "remote", &remote, N_("repo"),
  91                         N_("retrieve the archive from remote repository <repo>")),
  92                 OPT_STRING(0, "exec", &exec, N_("command"),
  93                         N_("path to the remote git-upload-archive command")),
  94                 OPT_END()
  95         };
  96
  97         argc = parse_options(argc, argv, prefix, local_opts, NULL,
  98                              PARSE_OPT_KEEP_ALL);
  99
 100         init_archivers();
 101
 102         if (output)
 103                 create_output_file(output);
 104
 105         if (remote)
 106                 return run_remote_archiver(argc, argv, remote, exec, output);
 107
 108         setvbuf(stderr, NULL, _IOLBF, BUFSIZ);
 109
 110         UNLEAK(output);
 111         return write_archive(argc, argv, prefix, the_repository, output, 0);
 112 }