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 = 0;
  87
  88                 ifd = open(source, O_RDONLY);
  89                 if (ifd < 0) {
  90                         if (!warn_if_not_exists && errno == ENOENT)
  91                                 return -1;
  92                         fprintf(stderr, "cannot open %s\n", source);
  93                         return -1;
  94                 }
  95                 ofd = open(dest, O_WRONLY | O_CREAT | O_EXCL, 0666);
  96                 if (ofd < 0) {
  97                         fprintf(stderr, "cannot open %s\n", dest);
  98                         close(ifd);
  99                         return -1;
 100                 }
 101                 status = copy_fd(ifd, ofd);
 102                 close(ofd);
 103                 if (status)
 104                         fprintf(stderr, "cannot write %s\n", dest);
 105                 else
 106                         pull_say("copy %s\n", hex);
 107                 return status;
 108         }
 109         fprintf(stderr, "failed to copy %s with given copy methods.\n", hex);
 110         return -1;
 111 }
 112
 113 static int fetch_pack(const unsigned char *sha1)
 114 {
 115         struct packed_git *target;
 116         char filename[PATH_MAX];
 117         if (setup_indices())
 118                 return -1;
 119         target = find_sha1_pack(sha1, packs);
 120         if (!target)
 121                 return error("Couldn't find %s: not separate or in any pack",
 122                              sha1_to_hex(sha1));
 123         if (get_verbosely) {
 124                 fprintf(stderr, "Getting pack %s\n",
 125                         sha1_to_hex(target->sha1));
 126                 fprintf(stderr, " which contains %s\n",
 127                         sha1_to_hex(sha1));
 128         }
 129         sprintf(filename, "%s/objects/pack/pack-%s.pack",
 130                 path, sha1_to_hex(target->sha1));
 131         copy_file(filename, sha1_pack_name(target->sha1),
 132                   sha1_to_hex(target->sha1), 1);
 133         sprintf(filename, "%s/objects/pack/pack-%s.idx",
 134                 path, sha1_to_hex(target->sha1));
 135         copy_file(filename, sha1_pack_index_name(target->sha1),
 136                   sha1_to_hex(target->sha1), 1);
 137         install_packed_git(target);
 138         return 0;
 139 }
 140
 141 static int fetch_file(const unsigned char *sha1)
 142 {
 143         static int object_name_start = -1;
 144         static char filename[PATH_MAX];
 145         char *hex = sha1_to_hex(sha1);
 146         char *dest_filename = sha1_file_name(sha1);
 147
 148         if (object_name_start < 0) {
 149                 strcpy(filename, path); /* e.g. git.git */
 150                 strcat(filename, "/objects/");
 151                 object_name_start = strlen(filename);
 152         }
 153         filename[object_name_start+0] = hex[0];
 154         filename[object_name_start+1] = hex[1];
 155         filename[object_name_start+2] = '/';
 156         strcpy(filename + object_name_start + 3, hex + 2);
 157         return copy_file(filename, dest_filename, hex, 0);
 158 }
 159
 160 int fetch(unsigned char *sha1)
 161 {
 162         if (has_sha1_file(sha1))
 163                 return 0;
 164         else
 165                 return fetch_file(sha1) && fetch_pack(sha1);
 166 }
 167
 168 int fetch_ref(char *ref, unsigned char *sha1)
 169 {
 170         static int ref_name_start = -1;
 171         static char filename[PATH_MAX];
 172         static char hex[41];
 173         int ifd;
 174
 175         if (ref_name_start < 0) {
 176                 sprintf(filename, "%s/refs/", path);
 177                 ref_name_start = strlen(filename);
 178         }
 179         strcpy(filename + ref_name_start, ref);
 180         ifd = open(filename, O_RDONLY);
 181         if (ifd < 0) {
 182                 close(ifd);
 183                 fprintf(stderr, "cannot open %s\n", filename);
 184                 return -1;
 185         }
 186         if (read(ifd, hex, 40) != 40 || get_sha1_hex(hex, sha1)) {
 187                 close(ifd);
 188                 fprintf(stderr, "cannot read from %s\n", filename);
 189                 return -1;
 190         }
 191         close(ifd);
 192         pull_say("ref %s\n", sha1_to_hex(sha1));
 193         return 0;
 194 }
 195
 196 static const char local_pull_usage[] =
 197 "git-local-fetch [-c] [-t] [-a] [-d] [-v] [-w filename] [--recover] [-l] [-s] [-n] commit-id path";
 198
 199 /*
 200  * By default we only use file copy.
 201  * If -l is specified, a hard link is attempted.
 202  * If -s is specified, then a symlink is attempted.
 203  * If -n is _not_ specified, then a regular file-to-file copy is done.
 204  */
 205 int main(int argc, char **argv)
 206 {
 207         char *commit_id;
 208         int arg = 1;
 209
 210         setup_git_directory();
 211
 212         while (arg < argc && argv[arg][0] == '-') {
 213                 if (argv[arg][1] == 't')
 214                         get_tree = 1;
 215                 else if (argv[arg][1] == 'c')
 216                         get_history = 1;
 217                 else if (argv[arg][1] == 'a') {
 218                         get_all = 1;
 219                         get_tree = 1;
 220                         get_history = 1;
 221                 }
 222                 else if (argv[arg][1] == 'l')
 223                         use_link = 1;
 224                 else if (argv[arg][1] == 's')
 225                         use_symlink = 1;
 226                 else if (argv[arg][1] == 'n')
 227                         use_filecopy = 0;
 228                 else if (argv[arg][1] == 'v')
 229                         get_verbosely = 1;
 230                 else if (argv[arg][1] == 'w')
 231                         write_ref = argv[++arg];
 232                 else if (!strcmp(argv[arg], "--recover"))
 233                         get_recover = 1;
 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 }