Andrew's git - gitweb.git/blob

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