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