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 "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 = 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_STRING(0, "format", &format, "fmt", "archive format"),
  96                 OPT_END()
  97         };
  98         char fmt_opt[32];
  99
 100         argc = parse_options(argc, argv, prefix, local_opts, NULL,
 101                              PARSE_OPT_KEEP_ALL);
 102
 103         if (output) {
 104                 create_output_file(output);
 105                 if (!format)
 106                         format = format_from_name(output);
 107         }
 108
 109         if (format) {
 110                 sprintf(fmt_opt, "--format=%s", format);
 111                 /*
 112                  * We have enough room in argv[] to muck it in place,
 113                  * because either --format and/or --output must have
 114                  * been given on the original command line if we get
 115                  * to this point, and parse_options() must have eaten
 116                  * it, i.e. we can add back one element to the array.
 117                  * But argv[] may contain "--"; we should make it the
 118                  * first option.
 119                  */
 120                 memmove(argv + 2, argv + 1, sizeof(*argv) * argc);
 121                 argv[1] = fmt_opt;
 122                 argv[++argc] = NULL;
 123         }
 124
 125         if (remote)
 126                 return run_remote_archiver(argc, argv, remote, exec);
 127
 128         setvbuf(stderr, NULL, _IOLBF, BUFSIZ);
 129
 130         return write_archive(argc, argv, prefix, 1);
 131 }