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 "parse-options.h"
   9#include "pkt-line.h"
  10#include "sideband.h"
  11
  12static 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
  25static 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
  63static 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
  79int 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}