local-pull.c

   1 /*
   2  * Copyright (C) 2005 Junio C Hamano
   3  */
   4 #include "cache.h"
   5 #include "commit.h"
   6 #include "pull.h"
   7
   8 static int use_link = 0;
   9 static int use_symlink = 0;
  10 static int use_filecopy = 1;
  11
  12 static char *path;
  13
  14 int 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
  76 static 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  */
  85 int 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 }