local-fetch.c

   1 /*
   2  * Copyright (C) 2005 Junio C Hamano
   3  */
   4 #include "cache.h"
   5 #include "commit.h"
   6 #include "fetch.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 static struct packed_git *packs = NULL;
  19
  20 static void setup_index(unsigned char *sha1)
  21 {
  22         struct packed_git *new_pack;
  23         char filename[PATH_MAX];
  24         strcpy(filename, path);
  25         strcat(filename, "/objects/pack/pack-");
  26         strcat(filename, sha1_to_hex(sha1));
  27         strcat(filename, ".idx");
  28         new_pack = parse_pack_index_file(sha1, filename);
  29         new_pack->next = packs;
  30         packs = new_pack;
  31 }
  32
  33 static int setup_indices(void)
  34 {
  35         DIR *dir;
  36         struct dirent *de;
  37         char filename[PATH_MAX];
  38         unsigned char sha1[20];
  39         sprintf(filename, "%s/objects/pack/", path);
  40         dir = opendir(filename);
  41         if (!dir)
  42                 return -1;
  43         while ((de = readdir(dir)) != NULL) {
  44                 int namelen = strlen(de->d_name);
  45                 if (namelen != 50 ||
  46                     strcmp(de->d_name + namelen - 5, ".pack"))
  47                         continue;
  48                 get_sha1_hex(de->d_name + 5, sha1);
  49                 setup_index(sha1);
  50         }
  51         closedir(dir);
  52         return 0;
  53 }
  54
  55 static int copy_file(const char *source, const char *dest, const char *hex)
  56 {
  57         if (use_link) {
  58                 if (!link(source, dest)) {
  59                         pull_say("link %s\n", hex);
  60                         return 0;
  61                 }
  62                 /* If we got ENOENT there is no point continuing. */
  63                 if (errno == ENOENT) {
  64                         fprintf(stderr, "does not exist %s\n", source);
  65                         return -1;
  66                 }
  67         }
  68         if (use_symlink && !symlink(source, dest)) {
  69                 pull_say("symlink %s\n", hex);
  70                 return 0;
  71         }
  72         if (use_filecopy) {
  73                 int ifd, ofd, status;
  74                 struct stat st;
  75                 void *map;
  76                 ifd = open(source, O_RDONLY);
  77                 if (ifd < 0 || fstat(ifd, &st) < 0) {
  78                         close(ifd);
  79                         fprintf(stderr, "cannot open %s\n", source);
  80                         return -1;
  81                 }
  82                 map = mmap(NULL, st.st_size, PROT_READ, MAP_PRIVATE, ifd, 0);
  83                 close(ifd);
  84                 if (map == MAP_FAILED) {
  85                         fprintf(stderr, "cannot mmap %s\n", source);
  86                         return -1;
  87                 }
  88                 ofd = open(dest, O_WRONLY | O_CREAT | O_EXCL, 0666);
  89                 status = ((ofd < 0) ||
  90                           (write(ofd, map, st.st_size) != st.st_size));
  91                 munmap(map, st.st_size);
  92                 close(ofd);
  93                 if (status)
  94                         fprintf(stderr, "cannot write %s\n", dest);
  95                 else
  96                         pull_say("copy %s\n", hex);
  97                 return status;
  98         }
  99         fprintf(stderr, "failed to copy %s with given copy methods.\n", hex);
 100         return -1;
 101 }
 102
 103 static int fetch_pack(const unsigned char *sha1)
 104 {
 105         struct packed_git *target;
 106         char filename[PATH_MAX];
 107         if (setup_indices())
 108                 return -1;
 109         target = find_sha1_pack(sha1, packs);
 110         if (!target)
 111                 return error("Couldn't find %s: not separate or in any pack",
 112                              sha1_to_hex(sha1));
 113         if (get_verbosely) {
 114                 fprintf(stderr, "Getting pack %s\n",
 115                         sha1_to_hex(target->sha1));
 116                 fprintf(stderr, " which contains %s\n",
 117                         sha1_to_hex(sha1));
 118         }
 119         sprintf(filename, "%s/objects/pack/pack-%s.pack",
 120                 path, sha1_to_hex(target->sha1));
 121         copy_file(filename, sha1_pack_name(target->sha1),
 122                   sha1_to_hex(target->sha1));
 123         sprintf(filename, "%s/objects/pack/pack-%s.idx",
 124                 path, sha1_to_hex(target->sha1));
 125         copy_file(filename, sha1_pack_index_name(target->sha1),
 126                   sha1_to_hex(target->sha1));
 127         install_packed_git(target);
 128         return 0;
 129 }
 130
 131 static int fetch_file(const unsigned char *sha1)
 132 {
 133         static int object_name_start = -1;
 134         static char filename[PATH_MAX];
 135         char *hex = sha1_to_hex(sha1);
 136         const char *dest_filename = sha1_file_name(sha1);
 137
 138         if (object_name_start < 0) {
 139                 strcpy(filename, path); /* e.g. git.git */
 140                 strcat(filename, "/objects/");
 141                 object_name_start = strlen(filename);
 142         }
 143         filename[object_name_start+0] = hex[0];
 144         filename[object_name_start+1] = hex[1];
 145         filename[object_name_start+2] = '/';
 146         strcpy(filename + object_name_start + 3, hex + 2);
 147         return copy_file(filename, dest_filename, hex);
 148 }
 149
 150 int fetch(unsigned char *sha1)
 151 {
 152         return fetch_file(sha1) && fetch_pack(sha1);
 153 }
 154
 155 int fetch_ref(char *ref, unsigned char *sha1)
 156 {
 157         static int ref_name_start = -1;
 158         static char filename[PATH_MAX];
 159         static char hex[41];
 160         int ifd;
 161
 162         if (ref_name_start < 0) {
 163                 sprintf(filename, "%s/refs/", path);
 164                 ref_name_start = strlen(filename);
 165         }
 166         strcpy(filename + ref_name_start, ref);
 167         ifd = open(filename, O_RDONLY);
 168         if (ifd < 0) {
 169                 close(ifd);
 170                 fprintf(stderr, "cannot open %s\n", filename);
 171                 return -1;
 172         }
 173         if (read(ifd, hex, 40) != 40 || get_sha1_hex(hex, sha1)) {
 174                 close(ifd);
 175                 fprintf(stderr, "cannot read from %s\n", filename);
 176                 return -1;
 177         }
 178         close(ifd);
 179         pull_say("ref %s\n", sha1_to_hex(sha1));
 180         return 0;
 181 }
 182
 183 static const char local_pull_usage[] =
 184 "git-local-fetch [-c] [-t] [-a] [-d] [-v] [-w filename] [--recover] [-l] [-s] [-n] commit-id path";
 185
 186 /*
 187  * By default we only use file copy.
 188  * If -l is specified, a hard link is attempted.
 189  * If -s is specified, then a symlink is attempted.
 190  * If -n is _not_ specified, then a regular file-to-file copy is done.
 191  */
 192 int main(int argc, char **argv)
 193 {
 194         char *commit_id;
 195         int arg = 1;
 196
 197         while (arg < argc && argv[arg][0] == '-') {
 198                 if (argv[arg][1] == 't')
 199                         get_tree = 1;
 200                 else if (argv[arg][1] == 'c')
 201                         get_history = 1;
 202                 else if (argv[arg][1] == 'a') {
 203                         get_all = 1;
 204                         get_tree = 1;
 205                         get_history = 1;
 206                 }
 207                 else if (argv[arg][1] == 'l')
 208                         use_link = 1;
 209                 else if (argv[arg][1] == 's')
 210                         use_symlink = 1;
 211                 else if (argv[arg][1] == 'n')
 212                         use_filecopy = 0;
 213                 else if (argv[arg][1] == 'v')
 214                         get_verbosely = 1;
 215                 else if (argv[arg][1] == 'w')
 216                         write_ref = argv[++arg];
 217                 else
 218                         usage(local_pull_usage);
 219                 arg++;
 220         }
 221         if (argc < arg + 2)
 222                 usage(local_pull_usage);
 223         commit_id = argv[arg];
 224         path = argv[arg + 1];
 225
 226         if (pull(commit_id))
 227                 return 1;
 228
 229         return 0;
 230 }