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, char *dest, const char *hex,
  56                      int warn_if_not_exists)
  57 {
  58         safe_create_leading_directories(dest);
  59         if (use_link) {
  60                 if (!link(source, dest)) {
  61                         pull_say("link %s\n", hex);
  62                         return 0;
  63                 }
  64                 /* If we got ENOENT there is no point continuing. */
  65                 if (errno == ENOENT) {
  66                         if (warn_if_not_exists)
  67                                 fprintf(stderr, "does not exist %s\n", source);
  68                         return -1;
  69                 }
  70         }
  71         if (use_symlink) {
  72                 struct stat st;
  73                 if (stat(source, &st)) {
  74                         if (!warn_if_not_exists && errno == ENOENT)
  75                                 return -1;
  76                         fprintf(stderr, "cannot stat %s: %s\n", source,
  77                                 strerror(errno));
  78                         return -1;
  79                 }
  80                 if (!symlink(source, dest)) {
  81                         pull_say("symlink %s\n", hex);
  82                         return 0;
  83                 }
  84         }
  85         if (use_filecopy) {
  86                 int ifd, ofd, status;
  87                 struct stat st;
  88                 void *map;
  89                 ifd = open(source, O_RDONLY);
  90                 if (ifd < 0 || fstat(ifd, &st) < 0) {
  91                         int err = errno;
  92                         if (ifd >= 0)
  93                                 close(ifd);
  94                         if (!warn_if_not_exists && err == ENOENT)
  95                                 return -1;
  96                         fprintf(stderr, "cannot open %s\n", source);
  97                         return -1;
  98                 }
  99                 map = mmap(NULL, st.st_size, PROT_READ, MAP_PRIVATE, ifd, 0);
 100                 close(ifd);
 101                 if (map == MAP_FAILED) {
 102                         fprintf(stderr, "cannot mmap %s\n", source);
 103                         return -1;
 104                 }
 105                 ofd = open(dest, O_WRONLY | O_CREAT | O_EXCL, 0666);
 106                 status = ((ofd < 0) ||
 107                           (write(ofd, map, st.st_size) != st.st_size));
 108                 munmap(map, st.st_size);
 109                 if (ofd >= 0)
 110                         close(ofd);
 111                 if (status)
 112                         fprintf(stderr, "cannot write %s\n", dest);
 113                 else
 114                         pull_say("copy %s\n", hex);
 115                 return status;
 116         }
 117         fprintf(stderr, "failed to copy %s with given copy methods.\n", hex);
 118         return -1;
 119 }
 120
 121 static int fetch_pack(const unsigned char *sha1)
 122 {
 123         struct packed_git *target;
 124         char filename[PATH_MAX];
 125         if (setup_indices())
 126                 return -1;
 127         target = find_sha1_pack(sha1, packs);
 128         if (!target)
 129                 return error("Couldn't find %s: not separate or in any pack",
 130                              sha1_to_hex(sha1));
 131         if (get_verbosely) {
 132                 fprintf(stderr, "Getting pack %s\n",
 133                         sha1_to_hex(target->sha1));
 134                 fprintf(stderr, " which contains %s\n",
 135                         sha1_to_hex(sha1));
 136         }
 137         sprintf(filename, "%s/objects/pack/pack-%s.pack",
 138                 path, sha1_to_hex(target->sha1));
 139         copy_file(filename, sha1_pack_name(target->sha1),
 140                   sha1_to_hex(target->sha1), 1);
 141         sprintf(filename, "%s/objects/pack/pack-%s.idx",
 142                 path, sha1_to_hex(target->sha1));
 143         copy_file(filename, sha1_pack_index_name(target->sha1),
 144                   sha1_to_hex(target->sha1), 1);
 145         install_packed_git(target);
 146         return 0;
 147 }
 148
 149 static int fetch_file(const unsigned char *sha1)
 150 {
 151         static int object_name_start = -1;
 152         static char filename[PATH_MAX];
 153         char *hex = sha1_to_hex(sha1);
 154         char *dest_filename = sha1_file_name(sha1);
 155
 156         if (object_name_start < 0) {
 157                 strcpy(filename, path); /* e.g. git.git */
 158                 strcat(filename, "/objects/");
 159                 object_name_start = strlen(filename);
 160         }
 161         filename[object_name_start+0] = hex[0];
 162         filename[object_name_start+1] = hex[1];
 163         filename[object_name_start+2] = '/';
 164         strcpy(filename + object_name_start + 3, hex + 2);
 165         return copy_file(filename, dest_filename, hex, 0);
 166 }
 167
 168 int fetch(unsigned char *sha1)
 169 {
 170         if (has_sha1_file(sha1))
 171                 return 0;
 172         else
 173                 return fetch_file(sha1) && fetch_pack(sha1);
 174 }
 175
 176 int fetch_ref(char *ref, unsigned char *sha1)
 177 {
 178         static int ref_name_start = -1;
 179         static char filename[PATH_MAX];
 180         static char hex[41];
 181         int ifd;
 182
 183         if (ref_name_start < 0) {
 184                 sprintf(filename, "%s/refs/", path);
 185                 ref_name_start = strlen(filename);
 186         }
 187         strcpy(filename + ref_name_start, ref);
 188         ifd = open(filename, O_RDONLY);
 189         if (ifd < 0) {
 190                 close(ifd);
 191                 fprintf(stderr, "cannot open %s\n", filename);
 192                 return -1;
 193         }
 194         if (read(ifd, hex, 40) != 40 || get_sha1_hex(hex, sha1)) {
 195                 close(ifd);
 196                 fprintf(stderr, "cannot read from %s\n", filename);
 197                 return -1;
 198         }
 199         close(ifd);
 200         pull_say("ref %s\n", sha1_to_hex(sha1));
 201         return 0;
 202 }
 203
 204 static const char local_pull_usage[] =
 205 "git-local-fetch [-c] [-t] [-a] [-d] [-v] [-w filename] [--recover] [-l] [-s] [-n] commit-id path";
 206
 207 /*
 208  * By default we only use file copy.
 209  * If -l is specified, a hard link is attempted.
 210  * If -s is specified, then a symlink is attempted.
 211  * If -n is _not_ specified, then a regular file-to-file copy is done.
 212  */
 213 int main(int argc, char **argv)
 214 {
 215         char *commit_id;
 216         int arg = 1;
 217
 218         while (arg < argc && argv[arg][0] == '-') {
 219                 if (argv[arg][1] == 't')
 220                         get_tree = 1;
 221                 else if (argv[arg][1] == 'c')
 222                         get_history = 1;
 223                 else if (argv[arg][1] == 'a') {
 224                         get_all = 1;
 225                         get_tree = 1;
 226                         get_history = 1;
 227                 }
 228                 else if (argv[arg][1] == 'l')
 229                         use_link = 1;
 230                 else if (argv[arg][1] == 's')
 231                         use_symlink = 1;
 232                 else if (argv[arg][1] == 'n')
 233                         use_filecopy = 0;
 234                 else if (argv[arg][1] == 'v')
 235                         get_verbosely = 1;
 236                 else if (argv[arg][1] == 'w')
 237                         write_ref = argv[++arg];
 238                 else if (!strcmp(argv[arg], "--recover"))
 239                         get_recover = 1;
 240                 else
 241                         usage(local_pull_usage);
 242                 arg++;
 243         }
 244         if (argc < arg + 2)
 245                 usage(local_pull_usage);
 246         commit_id = argv[arg];
 247         path = argv[arg + 1];
 248
 249         if (pull(commit_id))
 250                 return 1;
 251
 252         return 0;
 253 }