Andrew's git - gitweb.git/blob

   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
  13static 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
  26static 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
  66static 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
  82int 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}