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 {
  29         char buf[LARGE_PACKET_MAX];
  30         int fd[2], i, len, rv;
  31         struct transport *transport;
  32         struct remote *_remote;
  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         for (i = 1; i < argc; i++)
  41                 packet_write(fd[1], "argument %s\n", argv[i]);
  42         packet_flush(fd[1]);
  43
  44         len = packet_read_line(fd[0], buf, sizeof(buf));
  45         if (!len)
  46                 die(_("git archive: expected ACK/NAK, got EOF"));
  47         if (buf[len-1] == '\n')
  48                 buf[--len] = 0;
  49         if (strcmp(buf, "ACK")) {
  50                 if (len > 5 && !prefixcmp(buf, "NACK "))
  51                         die(_("git archive: NACK %s"), buf + 5);
  52                 die(_("git archive: protocol error"));
  53         }
  54
  55         len = packet_read_line(fd[0], buf, sizeof(buf));
  56         if (len)
  57                 die(_("git archive: expected a flush"));
  58
  59         /* Now, start reading from fd[0] and spit it out to stdout */
  60         rv = recv_sideband("archive", fd[0], 1);
  61         rv |= transport_disconnect(transport);
  62
  63         return !!rv;
  64 }
  65
  66 static const char *format_from_name(const char *filename)
  67 {
  68         const char *ext = strrchr(filename, '.');
  69         if (!ext)
  70                 return NULL;
  71         ext++;
  72         if (!strcasecmp(ext, "zip"))
  73                 return "--format=zip";
  74         return NULL;
  75 }
  76
  77 #define PARSE_OPT_KEEP_ALL ( PARSE_OPT_KEEP_DASHDASH |  \
  78                              PARSE_OPT_KEEP_ARGV0 |     \
  79                              PARSE_OPT_KEEP_UNKNOWN |   \
  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         const char *output = NULL;
  86         const char *remote = NULL;
  87         const char *format_option = NULL;
  88         struct option local_opts[] = {
  89                 OPT_STRING('o', "output", &output, "file",
  90                         "write the archive to this file"),
  91                 OPT_STRING(0, "remote", &remote, "repo",
  92                         "retrieve the archive from remote repository <repo>"),
  93                 OPT_STRING(0, "exec", &exec, "cmd",
  94                         "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         if (output) {
 102                 create_output_file(output);
 103                 format_option = format_from_name(output);
 104         }
 105
 106         /*
 107          * We have enough room in argv[] to muck it in place, because
 108          * --output must have been given on the original command line
 109          * if we get to this point, and parse_options() must have eaten
 110          * it, i.e. we can add back one element to the array.
 111          *
 112          * We add a fake --format option at the beginning, with the
 113          * format inferred from our output filename.  This way explicit
 114          * --format options can override it, and the fake option is
 115          * inserted before any "--" that might have been given.
 116          */
 117         if (format_option) {
 118                 memmove(argv + 2, argv + 1, sizeof(*argv) * argc);
 119                 argv[1] = format_option;
 120                 argv[++argc] = NULL;
 121         }
 122
 123         if (remote)
 124                 return run_remote_archiver(argc, argv, remote, exec);
 125
 126         setvbuf(stderr, NULL, _IOLBF, BUFSIZ);
 127
 128         return write_archive(argc, argv, prefix, 1);
 129 }