local-pull.c

   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
  15 static int use_link = 0;
  16 static int use_symlink = 0;
  17 static int use_filecopy = 1;
  18
  19 static char *path;
  20
  21 int 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 (%ld bytes)\n",
  75                                 dest_filename, st.st_size);
  76                 else
  77                         pull_say("copy %s\n", hex);
  78                 return status;
  79         }
  80         fprintf(stderr, "failed to copy %s with given copy methods.\n", hex);
  81         return -1;
  82 }
  83
  84 static const char *local_pull_usage =
  85 "git-local-pull [-c] [-t] [-a] [-l] [-s] [-n] [-v] commit-id path";
  86
  87 /*
  88  * By default we only use file copy.
  89  * If -l is specified, a hard link is attempted.
  90  * If -s is specified, then a symlink is attempted.
  91  * If -n is _not_ specified, then a regular file-to-file copy is done.
  92  */
  93 int main(int argc, char **argv)
  94 {
  95         char *commit_id;
  96         int arg = 1;
  97
  98         while (arg < argc && argv[arg][0] == '-') {
  99                 if (argv[arg][1] == 't')
 100                         get_tree = 1;
 101                 else if (argv[arg][1] == 'c')
 102                         get_history = 1;
 103                 else if (argv[arg][1] == 'a') {
 104                         get_all = 1;
 105                         get_tree = 1;
 106                         get_history = 1;
 107                 }
 108                 else if (argv[arg][1] == 'l')
 109                         use_link = 1;
 110                 else if (argv[arg][1] == 's')
 111                         use_symlink = 1;
 112                 else if (argv[arg][1] == 'n')
 113                         use_filecopy = 0;
 114                 else if (argv[arg][1] == 'v')
 115                         get_verbosely = 1;
 116                 else
 117                         usage(local_pull_usage);
 118                 arg++;
 119         }
 120         if (argc < arg + 2)
 121                 usage(local_pull_usage);
 122         commit_id = argv[arg];
 123         path = argv[arg + 1];
 124
 125         if (pull(commit_id))
 126                 return 1;
 127
 128         return 0;
 129 }