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 "parse-options.h"
   9 #include "pkt-line.h"
  10 #include "sideband.h"
  11
  12 static void create_output_file(const char *output_file)
  13 {
  14         int output_fd = open(output_file, O_CREAT | O_WRONLY | O_TRUNC, 0666);
  15         if (output_fd < 0)
  16                 die_errno("could not create archive file '%s'", output_file);
  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 {
  28         char *url, buf[LARGE_PACKET_MAX];
  29         int fd[2], i, len, rv;
  30         struct child_process *conn;
  31
  32         url = xstrdup(remote);
  33         conn = git_connect(fd, url, exec, 0);
  34
  35         for (i = 1; i < argc; i++)
  36                 packet_write(fd[1], "argument %s\n", argv[i]);
  37         packet_flush(fd[1]);
  38
  39         len = packet_read_line(fd[0], buf, sizeof(buf));
  40         if (!len)
  41                 die("git archive: expected ACK/NAK, got EOF");
  42         if (buf[len-1] == '\n')
  43                 buf[--len] = 0;
  44         if (strcmp(buf, "ACK")) {
  45                 if (len > 5 && !prefixcmp(buf, "NACK "))
  46                         die("git archive: NACK %s", buf + 5);
  47                 die("git archive: protocol error");
  48         }
  49
  50         len = packet_read_line(fd[0], buf, sizeof(buf));
  51         if (len)
  52                 die("git archive: expected a flush");
  53
  54         /* Now, start reading from fd[0] and spit it out to stdout */
  55         rv = recv_sideband("archive", fd[0], 1);
  56         close(fd[0]);
  57         close(fd[1]);
  58         rv |= finish_connect(conn);
  59
  60         return !!rv;
  61 }
  62
  63 static const char *format_from_name(const char *filename)
  64 {
  65         const char *ext = strrchr(filename, '.');
  66         if (!ext)
  67                 return NULL;
  68         ext++;
  69         if (!strcasecmp(ext, "zip"))
  70                 return "--format=zip";
  71         return NULL;
  72 }
  73
  74 #define PARSE_OPT_KEEP_ALL ( PARSE_OPT_KEEP_DASHDASH |  \
  75                              PARSE_OPT_KEEP_ARGV0 |     \
  76                              PARSE_OPT_KEEP_UNKNOWN |   \
  77                              PARSE_OPT_NO_INTERNAL_HELP )
  78
  79 int cmd_archive(int argc, const char **argv, const char *prefix)
  80 {
  81         const char *exec = "git-upload-archive";
  82         const char *output = NULL;
  83         const char *remote = NULL;
  84         const char *format_option = NULL;
  85         struct option local_opts[] = {
  86                 OPT_STRING('o', "output", &output, "file",
  87                         "write the archive to this file"),
  88                 OPT_STRING(0, "remote", &remote, "repo",
  89                         "retrieve the archive from remote repository <repo>"),
  90                 OPT_STRING(0, "exec", &exec, "cmd",
  91                         "path to the remote git-upload-archive command"),
  92                 OPT_END()
  93         };
  94
  95         argc = parse_options(argc, argv, prefix, local_opts, NULL,
  96                              PARSE_OPT_KEEP_ALL);
  97
  98         if (output) {
  99                 create_output_file(output);
 100                 format_option = format_from_name(output);
 101         }
 102
 103         /*
 104          * We have enough room in argv[] to muck it in place, because
 105          * --output must have been given on the original command line
 106          * if we get to this point, and parse_options() must have eaten
 107          * it, i.e. we can add back one element to the array.
 108          *
 109          * We add a fake --format option at the beginning, with the
 110          * format inferred from our output filename.  This way explicit
 111          * --format options can override it, and the fake option is
 112          * inserted before any "--" that might have been given.
 113          */
 114         if (format_option) {
 115                 memmove(argv + 2, argv + 1, sizeof(*argv) * argc);
 116                 argv[1] = format_option;
 117                 argv[++argc] = NULL;
 118         }
 119
 120         if (remote)
 121                 return run_remote_archiver(argc, argv, remote, exec);
 122
 123         setvbuf(stderr, NULL, _IOLBF, BUFSIZ);
 124
 125         return write_archive(argc, argv, prefix, 1);
 126 }