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) {
  43                if (!link(filename, dest_filename)) {
  44                        say("link %s\n", hex);
  45                        return 0;
  46                }
  47                /* If we got ENOENT there is no point continuing. */
  48                if (errno == ENOENT) {
  49                        fprintf(stderr, "does not exist %s\n", filename);
  50                        return -1;
  51                }
  52        }
  53        if (use_symlink && !symlink(filename, dest_filename)) {
  54                say("symlink %s\n", hex);
  55                return 0;
  56        }
  57        if (use_filecopy) {
  58                int ifd, ofd, status;
  59                struct stat st;
  60                void *map;
  61                ifd = open(filename, O_RDONLY);
  62                if (ifd < 0 || fstat(ifd, &st) < 0) {
  63                        close(ifd);
  64                        fprintf(stderr, "cannot open %s\n", filename);
  65                        return -1;
  66                }
  67                map = mmap(NULL, st.st_size, PROT_READ, MAP_PRIVATE, ifd, 0);
  68                close(ifd);
  69                if (-1 == (int)(long)map) {
  70                        fprintf(stderr, "cannot mmap %s\n", filename);
  71                        return -1;
  72                }
  73                ofd = open(dest_filename, O_WRONLY | O_CREAT | O_EXCL, 0666);
  74                status = ((ofd < 0) ||
  75                          (write(ofd, map, st.st_size) != st.st_size));
  76                munmap(map, st.st_size);
  77                close(ofd);
  78                if (status)
  79                        fprintf(stderr, "cannot write %s (%ld bytes)\n",
  80                                dest_filename, st.st_size);
  81                else
  82                        say("copy %s\n", hex);
  83                return status;
  84        }
  85        fprintf(stderr, "failed to copy %s with given copy methods.\n", hex);
  86        return -1;
  87}
  88
  89static const char *local_pull_usage = 
  90"git-local-pull [-c] [-t] [-a] [-l] [-s] [-n] [-v] commit-id path";
  91
  92/* 
  93 * By default we only use file copy.
  94 * If -l is specified, a hard link is attempted.
  95 * If -s is specified, then a symlink is attempted.
  96 * If -n is _not_ specified, then a regular file-to-file copy is done.
  97 */
  98int main(int argc, char **argv)
  99{
 100        char *commit_id;
 101        int arg = 1;
 102
 103        while (arg < argc && argv[arg][0] == '-') {
 104                if (argv[arg][1] == 't')
 105                        get_tree = 1;
 106                else if (argv[arg][1] == 'c')
 107                        get_history = 1;
 108                else if (argv[arg][1] == 'a') {
 109                        get_all = 1;
 110                        get_tree = 1;
 111                        get_history = 1;
 112                }
 113                else if (argv[arg][1] == 'l')
 114                        use_link = 1;
 115                else if (argv[arg][1] == 's')
 116                        use_symlink = 1;
 117                else if (argv[arg][1] == 'n')
 118                        use_filecopy = 0;
 119                else if (argv[arg][1] == 'v')
 120                        verbose = 1;
 121                else
 122                        usage(local_pull_usage);
 123                arg++;
 124        }
 125        if (argc < arg + 2)
 126                usage(local_pull_usage);
 127        commit_id = argv[arg];
 128        path = argv[arg + 1];
 129
 130        if (pull(commit_id))
 131                return 1;
 132
 133        return 0;
 134}