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 "cache.h"
   9 #include "commit.h"
  10 #include <errno.h>
  11 #include <stdio.h>
  12 #include "pull.h"
  13
  14 static int use_link = 0;
  15 static int use_symlink = 0;
  16 static int use_filecopy = 1;
  17 static int verbose = 0;
  18
  19 static char *path;
  20
  21 static void say(const char *fmt, const char *hex) {
  22         if (verbose)
  23                 fprintf(stderr, fmt, hex);
  24 }
  25
  26 int 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
  89 static 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  */
  98 int 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 }