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