Andrew's git - gitweb.git/blob

   1/*
   2 * Copyright (C) 2005 Junio C Hamano
   3 */
   4#include <fcntl.h>
   5#include <unistd.h>
   6#include <string.h>
   7#include <stdlib.h>
   8#include <limits.h>
   9#include "cache.h"
  10#include "commit.h"
  11#include <errno.h>
  12#include <stdio.h>
  13#include "pull.h"
  14
  15static int use_link = 0;
  16static int use_symlink = 0;
  17static int use_filecopy = 1;
  18
  19static char *path;
  20
  21int fetch(unsigned char *sha1)
  22{
  23        static int object_name_start = -1;
  24        static char filename[PATH_MAX];
  25        char *hex = sha1_to_hex(sha1);
  26        const char *dest_filename = sha1_file_name(sha1);
  27
  28        if (object_name_start < 0) {
  29                strcpy(filename, path); /* e.g. git.git */
  30                strcat(filename, "/objects/");
  31                object_name_start = strlen(filename);
  32        }
  33        filename[object_name_start+0] = hex[0];
  34        filename[object_name_start+1] = hex[1];
  35        filename[object_name_start+2] = '/';
  36        strcpy(filename + object_name_start + 3, hex + 2);
  37        if (use_link) {
  38                if (!link(filename, dest_filename)) {
  39                        pull_say("link %s\n", hex);
  40                        return 0;
  41                }
  42                /* If we got ENOENT there is no point continuing. */
  43                if (errno == ENOENT) {
  44                        fprintf(stderr, "does not exist %s\n", filename);
  45                        return -1;
  46                }
  47        }
  48        if (use_symlink && !symlink(filename, dest_filename)) {
  49                pull_say("symlink %s\n", hex);
  50                return 0;
  51        }
  52        if (use_filecopy) {
  53                int ifd, ofd, status;
  54                struct stat st;
  55                void *map;
  56                ifd = open(filename, O_RDONLY);
  57                if (ifd < 0 || fstat(ifd, &st) < 0) {
  58                        close(ifd);
  59                        fprintf(stderr, "cannot open %s\n", filename);
  60                        return -1;
  61                }
  62                map = mmap(NULL, st.st_size, PROT_READ, MAP_PRIVATE, ifd, 0);
  63                close(ifd);
  64                if (-1 == (int)(long)map) {
  65                        fprintf(stderr, "cannot mmap %s\n", filename);
  66                        return -1;
  67                }
  68                ofd = open(dest_filename, O_WRONLY | O_CREAT | O_EXCL, 0666);
  69                status = ((ofd < 0) ||
  70                          (write(ofd, map, st.st_size) != st.st_size));
  71                munmap(map, st.st_size);
  72                close(ofd);
  73                if (status)
  74                        fprintf(stderr, "cannot write %s\n", dest_filename);
  75                else
  76                        pull_say("copy %s\n", hex);
  77                return status;
  78        }
  79        fprintf(stderr, "failed to copy %s with given copy methods.\n", hex);
  80        return -1;
  81}
  82
  83static const char *local_pull_usage = 
  84"git-local-pull [-c] [-t] [-a] [-l] [-s] [-n] [-v] commit-id path";
  85
  86/* 
  87 * By default we only use file copy.
  88 * If -l is specified, a hard link is attempted.
  89 * If -s is specified, then a symlink is attempted.
  90 * If -n is _not_ specified, then a regular file-to-file copy is done.
  91 */
  92int main(int argc, char **argv)
  93{
  94        char *commit_id;
  95        int arg = 1;
  96
  97        while (arg < argc && argv[arg][0] == '-') {
  98                if (argv[arg][1] == 't')
  99                        get_tree = 1;
 100                else if (argv[arg][1] == 'c')
 101                        get_history = 1;
 102                else if (argv[arg][1] == 'a') {
 103                        get_all = 1;
 104                        get_tree = 1;
 105                        get_history = 1;
 106                }
 107                else if (argv[arg][1] == 'l')
 108                        use_link = 1;
 109                else if (argv[arg][1] == 's')
 110                        use_symlink = 1;
 111                else if (argv[arg][1] == 'n')
 112                        use_filecopy = 0;
 113                else if (argv[arg][1] == 'v')
 114                        get_verbosely = 1;
 115                else
 116                        usage(local_pull_usage);
 117                arg++;
 118        }
 119        if (argc < arg + 2)
 120                usage(local_pull_usage);
 121        commit_id = argv[arg];
 122        path = argv[arg + 1];
 123
 124        if (pull(commit_id))
 125                return 1;
 126
 127        return 0;
 128}