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