builtin/archive.c

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