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 static int commits_on_stdin = 0;
  12
  13 static const char *path; /* "Remote" git repository */
  14
  15 void prefetch(unsigned char *sha1)
  16 {
  17 }
  18
  19 static struct packed_git *packs = NULL;
  20
  21 static void setup_index(unsigned char *sha1)
  22 {
  23         struct packed_git *new_pack;
  24         char filename[PATH_MAX];
  25         strcpy(filename, path);
  26         strcat(filename, "/objects/pack/pack-");
  27         strcat(filename, sha1_to_hex(sha1));
  28         strcat(filename, ".idx");
  29         new_pack = parse_pack_index_file(sha1, filename);
  30         new_pack->next = packs;
  31         packs = new_pack;
  32 }
  33
  34 static int setup_indices(void)
  35 {
  36         DIR *dir;
  37         struct dirent *de;
  38         char filename[PATH_MAX];
  39         unsigned char sha1[20];
  40         sprintf(filename, "%s/objects/pack/", path);
  41         dir = opendir(filename);
  42         if (!dir)
  43                 return -1;
  44         while ((de = readdir(dir)) != NULL) {
  45                 int namelen = strlen(de->d_name);
  46                 if (namelen != 50 ||
  47                     strcmp(de->d_name + namelen - 5, ".pack"))
  48                         continue;
  49                 get_sha1_hex(de->d_name + 5, sha1);
  50                 setup_index(sha1);
  51         }
  52         closedir(dir);
  53         return 0;
  54 }
  55
  56 static int copy_file(const char *source, char *dest, const char *hex,
  57                      int warn_if_not_exists)
  58 {
  59         safe_create_leading_directories(dest);
  60         if (use_link) {
  61                 if (!link(source, dest)) {
  62                         pull_say("link %s\n", hex);
  63                         return 0;
  64                 }
  65                 /* If we got ENOENT there is no point continuing. */
  66                 if (errno == ENOENT) {
  67                         if (warn_if_not_exists)
  68                                 fprintf(stderr, "does not exist %s\n", source);
  69                         return -1;
  70                 }
  71         }
  72         if (use_symlink) {
  73                 struct stat st;
  74                 if (stat(source, &st)) {
  75                         if (!warn_if_not_exists && errno == ENOENT)
  76                                 return -1;
  77                         fprintf(stderr, "cannot stat %s: %s\n", source,
  78                                 strerror(errno));
  79                         return -1;
  80                 }
  81                 if (!symlink(source, dest)) {
  82                         pull_say("symlink %s\n", hex);
  83                         return 0;
  84                 }
  85         }
  86         if (use_filecopy) {
  87                 int ifd, ofd, status = 0;
  88
  89                 ifd = open(source, O_RDONLY);
  90                 if (ifd < 0) {
  91                         if (!warn_if_not_exists && errno == ENOENT)
  92                                 return -1;
  93                         fprintf(stderr, "cannot open %s\n", source);
  94                         return -1;
  95                 }
  96                 ofd = open(dest, O_WRONLY | O_CREAT | O_EXCL, 0666);
  97                 if (ofd < 0) {
  98                         fprintf(stderr, "cannot open %s\n", dest);
  99                         close(ifd);
 100                         return -1;
 101                 }
 102                 status = copy_fd(ifd, ofd);
 103                 close(ofd);
 104                 if (status)
 105                         fprintf(stderr, "cannot write %s\n", dest);
 106                 else
 107                         pull_say("copy %s\n", hex);
 108                 return status;
 109         }
 110         fprintf(stderr, "failed to copy %s with given copy methods.\n", hex);
 111         return -1;
 112 }
 113
 114 static int fetch_pack(const unsigned char *sha1)
 115 {
 116         struct packed_git *target;
 117         char filename[PATH_MAX];
 118         if (setup_indices())
 119                 return -1;
 120         target = find_sha1_pack(sha1, packs);
 121         if (!target)
 122                 return error("Couldn't find %s: not separate or in any pack",
 123                              sha1_to_hex(sha1));
 124         if (get_verbosely) {
 125                 fprintf(stderr, "Getting pack %s\n",
 126                         sha1_to_hex(target->sha1));
 127                 fprintf(stderr, " which contains %s\n",
 128                         sha1_to_hex(sha1));
 129         }
 130         sprintf(filename, "%s/objects/pack/pack-%s.pack",
 131                 path, sha1_to_hex(target->sha1));
 132         copy_file(filename, sha1_pack_name(target->sha1),
 133                   sha1_to_hex(target->sha1), 1);
 134         sprintf(filename, "%s/objects/pack/pack-%s.idx",
 135                 path, sha1_to_hex(target->sha1));
 136         copy_file(filename, sha1_pack_index_name(target->sha1),
 137                   sha1_to_hex(target->sha1), 1);
 138         install_packed_git(target);
 139         return 0;
 140 }
 141
 142 static int fetch_file(const unsigned char *sha1)
 143 {
 144         static int object_name_start = -1;
 145         static char filename[PATH_MAX];
 146         char *hex = sha1_to_hex(sha1);
 147         char *dest_filename = sha1_file_name(sha1);
 148
 149         if (object_name_start < 0) {
 150                 strcpy(filename, path); /* e.g. git.git */
 151                 strcat(filename, "/objects/");
 152                 object_name_start = strlen(filename);
 153         }
 154         filename[object_name_start+0] = hex[0];
 155         filename[object_name_start+1] = hex[1];
 156         filename[object_name_start+2] = '/';
 157         strcpy(filename + object_name_start + 3, hex + 2);
 158         return copy_file(filename, dest_filename, hex, 0);
 159 }
 160
 161 int fetch(unsigned char *sha1)
 162 {
 163         if (has_sha1_file(sha1))
 164                 return 0;
 165         else
 166                 return fetch_file(sha1) && fetch_pack(sha1);
 167 }
 168
 169 int fetch_ref(char *ref, unsigned char *sha1)
 170 {
 171         static int ref_name_start = -1;
 172         static char filename[PATH_MAX];
 173         static char hex[41];
 174         int ifd;
 175
 176         if (ref_name_start < 0) {
 177                 sprintf(filename, "%s/refs/", path);
 178                 ref_name_start = strlen(filename);
 179         }
 180         strcpy(filename + ref_name_start, ref);
 181         ifd = open(filename, O_RDONLY);
 182         if (ifd < 0) {
 183                 close(ifd);
 184                 fprintf(stderr, "cannot open %s\n", filename);
 185                 return -1;
 186         }
 187         if (read(ifd, hex, 40) != 40 || get_sha1_hex(hex, sha1)) {
 188                 close(ifd);
 189                 fprintf(stderr, "cannot read from %s\n", filename);
 190                 return -1;
 191         }
 192         close(ifd);
 193         pull_say("ref %s\n", sha1_to_hex(sha1));
 194         return 0;
 195 }
 196
 197 static const char local_pull_usage[] =
 198 "git-local-fetch [-c] [-t] [-a] [-v] [-w filename] [--recover] [-l] [-s] [-n] [--stdin] commit-id path";
 199
 200 /*
 201  * By default we only use file copy.
 202  * If -l is specified, a hard link is attempted.
 203  * If -s is specified, then a symlink is attempted.
 204  * If -n is _not_ specified, then a regular file-to-file copy is done.
 205  */
 206 int main(int argc, const char **argv)
 207 {
 208         int commits;
 209         const char **write_ref = NULL;
 210         char **commit_id;
 211         int arg = 1;
 212
 213         setup_git_directory();
 214         git_config(git_default_config);
 215
 216         while (arg < argc && argv[arg][0] == '-') {
 217                 if (argv[arg][1] == 't')
 218                         get_tree = 1;
 219                 else if (argv[arg][1] == 'c')
 220                         get_history = 1;
 221                 else if (argv[arg][1] == 'a') {
 222                         get_all = 1;
 223                         get_tree = 1;
 224                         get_history = 1;
 225                 }
 226                 else if (argv[arg][1] == 'l')
 227                         use_link = 1;
 228                 else if (argv[arg][1] == 's')
 229                         use_symlink = 1;
 230                 else if (argv[arg][1] == 'n')
 231                         use_filecopy = 0;
 232                 else if (argv[arg][1] == 'v')
 233                         get_verbosely = 1;
 234                 else if (argv[arg][1] == 'w')
 235                         write_ref = &argv[++arg];
 236                 else if (!strcmp(argv[arg], "--recover"))
 237                         get_recover = 1;
 238                 else if (!strcmp(argv[arg], "--stdin"))
 239                         commits_on_stdin = 1;
 240                 else
 241                         usage(local_pull_usage);
 242                 arg++;
 243         }
 244         if (argc < arg + 2 - commits_on_stdin)
 245                 usage(local_pull_usage);
 246         if (commits_on_stdin) {
 247                 commits = pull_targets_stdin(&commit_id, &write_ref);
 248         } else {
 249                 commit_id = (char **) &argv[arg++];
 250                 commits = 1;
 251         }
 252         path = argv[arg];
 253
 254         if (pull(commits, commit_id, write_ref, path))
 255                 return 1;
 256
 257         if (commits_on_stdin)
 258                 pull_targets_free(commits, commit_id, write_ref);
 259
 260         return 0;
 261 }