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; /* "Remote" git repository */
  13
  14 void prefetch(unsigned char *sha1)
  15 {
  16 }
  17
  18 int fetch(unsigned char *sha1)
  19 {
  20         static int object_name_start = -1;
  21         static char filename[PATH_MAX];
  22         char *hex = sha1_to_hex(sha1);
  23         const char *dest_filename = sha1_file_name(sha1);
  24
  25         if (object_name_start < 0) {
  26                 strcpy(filename, path); /* e.g. git.git */
  27                 strcat(filename, "/objects/");
  28                 object_name_start = strlen(filename);
  29         }
  30         filename[object_name_start+0] = hex[0];
  31         filename[object_name_start+1] = hex[1];
  32         filename[object_name_start+2] = '/';
  33         strcpy(filename + object_name_start + 3, hex + 2);
  34         if (use_link) {
  35                 if (!link(filename, dest_filename)) {
  36                         pull_say("link %s\n", hex);
  37                         return 0;
  38                 }
  39                 /* If we got ENOENT there is no point continuing. */
  40                 if (errno == ENOENT) {
  41                         fprintf(stderr, "does not exist %s\n", filename);
  42                         return -1;
  43                 }
  44         }
  45         if (use_symlink && !symlink(filename, dest_filename)) {
  46                 pull_say("symlink %s\n", hex);
  47                 return 0;
  48         }
  49         if (use_filecopy) {
  50                 int ifd, ofd, status;
  51                 struct stat st;
  52                 void *map;
  53                 ifd = open(filename, O_RDONLY);
  54                 if (ifd < 0 || fstat(ifd, &st) < 0) {
  55                         close(ifd);
  56                         fprintf(stderr, "cannot open %s\n", filename);
  57                         return -1;
  58                 }
  59                 map = mmap(NULL, st.st_size, PROT_READ, MAP_PRIVATE, ifd, 0);
  60                 close(ifd);
  61                 if (map == MAP_FAILED) {
  62                         fprintf(stderr, "cannot mmap %s\n", filename);
  63                         return -1;
  64                 }
  65                 ofd = open(dest_filename, O_WRONLY | O_CREAT | O_EXCL, 0666);
  66                 status = ((ofd < 0) ||
  67                           (write(ofd, map, st.st_size) != st.st_size));
  68                 munmap(map, st.st_size);
  69                 close(ofd);
  70                 if (status)
  71                         fprintf(stderr, "cannot write %s\n", dest_filename);
  72                 else
  73                         pull_say("copy %s\n", hex);
  74                 return status;
  75         }
  76         fprintf(stderr, "failed to copy %s with given copy methods.\n", hex);
  77         return -1;
  78 }
  79
  80 int fetch_ref(char *ref, unsigned char *sha1)
  81 {
  82         static int ref_name_start = -1;
  83         static char filename[PATH_MAX];
  84         static char hex[41];
  85         int ifd;
  86
  87         if (ref_name_start < 0) {
  88                 sprintf(filename, "%s/refs/", path);
  89                 ref_name_start = strlen(filename);
  90         }
  91         strcpy(filename + ref_name_start, ref);
  92         ifd = open(filename, O_RDONLY);
  93         if (ifd < 0) {
  94                 close(ifd);
  95                 fprintf(stderr, "cannot open %s\n", filename);
  96                 return -1;
  97         }
  98         if (read(ifd, hex, 40) != 40 || get_sha1_hex(hex, sha1)) {
  99                 close(ifd);
 100                 fprintf(stderr, "cannot read from %s\n", filename);
 101                 return -1;
 102         }
 103         close(ifd);
 104         pull_say("ref %s\n", sha1_to_hex(sha1));
 105         return 0;
 106 }
 107
 108 static const char local_pull_usage[] =
 109 "git-local-pull [-c] [-t] [-a] [-d] [-v] [-w filename] [--recover] [-l] [-s] [-n] commit-id path";
 110
 111 /*
 112  * By default we only use file copy.
 113  * If -l is specified, a hard link is attempted.
 114  * If -s is specified, then a symlink is attempted.
 115  * If -n is _not_ specified, then a regular file-to-file copy is done.
 116  */
 117 int main(int argc, char **argv)
 118 {
 119         char *commit_id;
 120         int arg = 1;
 121
 122         while (arg < argc && argv[arg][0] == '-') {
 123                 if (argv[arg][1] == 't')
 124                         get_tree = 1;
 125                 else if (argv[arg][1] == 'c')
 126                         get_history = 1;
 127                 else if (argv[arg][1] == 'a') {
 128                         get_all = 1;
 129                         get_tree = 1;
 130                         get_history = 1;
 131                 }
 132                 else if (argv[arg][1] == 'l')
 133                         use_link = 1;
 134                 else if (argv[arg][1] == 's')
 135                         use_symlink = 1;
 136                 else if (argv[arg][1] == 'n')
 137                         use_filecopy = 0;
 138                 else if (argv[arg][1] == 'v')
 139                         get_verbosely = 1;
 140                 else if (argv[arg][1] == 'w')
 141                         write_ref = argv[++arg];
 142                 else
 143                         usage(local_pull_usage);
 144                 arg++;
 145         }
 146         if (argc < arg + 2)
 147                 usage(local_pull_usage);
 148         commit_id = argv[arg];
 149         path = argv[arg + 1];
 150
 151         if (pull(commit_id))
 152                 return 1;
 153
 154         return 0;
 155 }