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                         if (ifd >= 0)
  79                                 close(ifd);
  80                         fprintf(stderr, "cannot open %s\n", source);
  81                         return -1;
  82                 }
  83                 map = mmap(NULL, st.st_size, PROT_READ, MAP_PRIVATE, ifd, 0);
  84                 close(ifd);
  85                 if (map == MAP_FAILED) {
  86                         fprintf(stderr, "cannot mmap %s\n", source);
  87                         return -1;
  88                 }
  89                 ofd = open(dest, O_WRONLY | O_CREAT | O_EXCL, 0666);
  90                 status = ((ofd < 0) ||
  91                           (write(ofd, map, st.st_size) != st.st_size));
  92                 munmap(map, st.st_size);
  93                 if (ofd >= 0)
  94                         close(ofd);
  95                 if (status)
  96                         fprintf(stderr, "cannot write %s\n", dest);
  97                 else
  98                         pull_say("copy %s\n", hex);
  99                 return status;
 100         }
 101         fprintf(stderr, "failed to copy %s with given copy methods.\n", hex);
 102         return -1;
 103 }
 104
 105 static int fetch_pack(const unsigned char *sha1)
 106 {
 107         struct packed_git *target;
 108         char filename[PATH_MAX];
 109         if (setup_indices())
 110                 return -1;
 111         target = find_sha1_pack(sha1, packs);
 112         if (!target)
 113                 return error("Couldn't find %s: not separate or in any pack",
 114                              sha1_to_hex(sha1));
 115         if (get_verbosely) {
 116                 fprintf(stderr, "Getting pack %s\n",
 117                         sha1_to_hex(target->sha1));
 118                 fprintf(stderr, " which contains %s\n",
 119                         sha1_to_hex(sha1));
 120         }
 121         sprintf(filename, "%s/objects/pack/pack-%s.pack",
 122                 path, sha1_to_hex(target->sha1));
 123         copy_file(filename, sha1_pack_name(target->sha1),
 124                   sha1_to_hex(target->sha1));
 125         sprintf(filename, "%s/objects/pack/pack-%s.idx",
 126                 path, sha1_to_hex(target->sha1));
 127         copy_file(filename, sha1_pack_index_name(target->sha1),
 128                   sha1_to_hex(target->sha1));
 129         install_packed_git(target);
 130         return 0;
 131 }
 132
 133 static int fetch_file(const unsigned char *sha1)
 134 {
 135         static int object_name_start = -1;
 136         static char filename[PATH_MAX];
 137         char *hex = sha1_to_hex(sha1);
 138         const char *dest_filename = sha1_file_name(sha1);
 139
 140         if (object_name_start < 0) {
 141                 strcpy(filename, path); /* e.g. git.git */
 142                 strcat(filename, "/objects/");
 143                 object_name_start = strlen(filename);
 144         }
 145         filename[object_name_start+0] = hex[0];
 146         filename[object_name_start+1] = hex[1];
 147         filename[object_name_start+2] = '/';
 148         strcpy(filename + object_name_start + 3, hex + 2);
 149         return copy_file(filename, dest_filename, hex);
 150 }
 151
 152 int fetch(unsigned char *sha1)
 153 {
 154         return fetch_file(sha1) && fetch_pack(sha1);
 155 }
 156
 157 int fetch_ref(char *ref, unsigned char *sha1)
 158 {
 159         static int ref_name_start = -1;
 160         static char filename[PATH_MAX];
 161         static char hex[41];
 162         int ifd;
 163
 164         if (ref_name_start < 0) {
 165                 sprintf(filename, "%s/refs/", path);
 166                 ref_name_start = strlen(filename);
 167         }
 168         strcpy(filename + ref_name_start, ref);
 169         ifd = open(filename, O_RDONLY);
 170         if (ifd < 0) {
 171                 close(ifd);
 172                 fprintf(stderr, "cannot open %s\n", filename);
 173                 return -1;
 174         }
 175         if (read(ifd, hex, 40) != 40 || get_sha1_hex(hex, sha1)) {
 176                 close(ifd);
 177                 fprintf(stderr, "cannot read from %s\n", filename);
 178                 return -1;
 179         }
 180         close(ifd);
 181         pull_say("ref %s\n", sha1_to_hex(sha1));
 182         return 0;
 183 }
 184
 185 static const char local_pull_usage[] =
 186 "git-local-fetch [-c] [-t] [-a] [-d] [-v] [-w filename] [--recover] [-l] [-s] [-n] commit-id path";
 187
 188 /*
 189  * By default we only use file copy.
 190  * If -l is specified, a hard link is attempted.
 191  * If -s is specified, then a symlink is attempted.
 192  * If -n is _not_ specified, then a regular file-to-file copy is done.
 193  */
 194 int main(int argc, char **argv)
 195 {
 196         char *commit_id;
 197         int arg = 1;
 198
 199         while (arg < argc && argv[arg][0] == '-') {
 200                 if (argv[arg][1] == 't')
 201                         get_tree = 1;
 202                 else if (argv[arg][1] == 'c')
 203                         get_history = 1;
 204                 else if (argv[arg][1] == 'a') {
 205                         get_all = 1;
 206                         get_tree = 1;
 207                         get_history = 1;
 208                 }
 209                 else if (argv[arg][1] == 'l')
 210                         use_link = 1;
 211                 else if (argv[arg][1] == 's')
 212                         use_symlink = 1;
 213                 else if (argv[arg][1] == 'n')
 214                         use_filecopy = 0;
 215                 else if (argv[arg][1] == 'v')
 216                         get_verbosely = 1;
 217                 else if (argv[arg][1] == 'w')
 218                         write_ref = argv[++arg];
 219                 else
 220                         usage(local_pull_usage);
 221                 arg++;
 222         }
 223         if (argc < arg + 2)
 224                 usage(local_pull_usage);
 225         commit_id = argv[arg];
 226         path = argv[arg + 1];
 227
 228         if (pull(commit_id))
 229                 return 1;
 230
 231         return 0;
 232 }