local-pull.c

   1 #include <fcntl.h>
   2 #include <unistd.h>
   3 #include <string.h>
   4 #include <stdlib.h>
   5 #include "cache.h"
   6 #include "commit.h"
   7 #include <errno.h>
   8 #include <stdio.h>
   9 #include "pull.h"
  10
  11 static int use_link = 0;
  12 static int use_symlink = 0;
  13 static int verbose = 0;
  14
  15 static char *path;
  16
  17 static void say(const char *fmt, const char *hex) {
  18         if (verbose)
  19                 fprintf(stderr, fmt, hex);
  20 }
  21
  22 int fetch(unsigned char *sha1)
  23 {
  24         static int object_name_start = -1;
  25         static char filename[PATH_MAX];
  26         char *hex = sha1_to_hex(sha1);
  27         const char *dest_filename = sha1_file_name(sha1);
  28         int ifd, ofd, status;
  29         struct stat st;
  30         void *map;
  31
  32         if (object_name_start < 0) {
  33                 strcpy(filename, path); /* e.g. git.git */
  34                 strcat(filename, "/objects/");
  35                 object_name_start = strlen(filename);
  36         }
  37         filename[object_name_start+0] = hex[0];
  38         filename[object_name_start+1] = hex[1];
  39         filename[object_name_start+2] = '/';
  40         strcpy(filename + object_name_start + 3, hex + 2);
  41         if (use_link && !link(filename, dest_filename)) {
  42                 say("Hardlinked %s.\n", hex);
  43                 return 0;
  44         }
  45         if (use_symlink && !symlink(filename, dest_filename)) {
  46                 say("Symlinked %s.\n", hex);
  47                 return 0;
  48         }
  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) || (write(ofd, map, st.st_size) != st.st_size));
  63         munmap(map, st.st_size);
  64         close(ofd);
  65         if (status)
  66                 fprintf(stderr, "Cannot write %s (%ld bytes)\n",
  67                         dest_filename, st.st_size);
  68         else
  69                 say("Copied %s.\n", hex);
  70         return status;
  71 }
  72
  73 static const char *local_pull_usage =
  74 "git-local-pull [-c] [-t] [-a] [-l] [-s] [-v] commit-id path";
  75
  76 int main(int argc, char **argv)
  77 {
  78         char *commit_id;
  79         int arg = 1;
  80
  81         while (arg < argc && argv[arg][0] == '-') {
  82                 if (argv[arg][1] == 't')
  83                         get_tree = 1;
  84                 else if (argv[arg][1] == 'c')
  85                         get_history = 1;
  86                 else if (argv[arg][1] == 'a') {
  87                         get_all = 1;
  88                         get_tree = 1;
  89                         get_history = 1;
  90                 }
  91                 else if (argv[arg][1] == 'l')
  92                         use_link = 1;
  93                 else if (argv[arg][1] == 's')
  94                         use_symlink = 1;
  95                 else if (argv[arg][1] == 'v')
  96                         verbose = 1;
  97                 else
  98                         usage(local_pull_usage);
  99                 arg++;
 100         }
 101         if (argc < arg + 2)
 102                 usage(local_pull_usage);
 103         commit_id = argv[arg];
 104         path = argv[arg + 1];
 105
 106         if (pull(commit_id))
 107                 return 1;
 108
 109         return 0;
 110 }