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) {
  69                 struct stat st;
  70                 if (stat(source, &st)) {
  71                         fprintf(stderr, "cannot stat %s: %s\n", source,
  72                                 strerror(errno));
  73                         return -1;
  74                 }
  75                 if (!symlink(source, dest)) {
  76                         pull_say("symlink %s\n", hex);
  77                         return 0;
  78                 }
  79         }
  80         if (use_filecopy) {
  81                 int ifd, ofd, status;
  82                 struct stat st;
  83                 void *map;
  84                 ifd = open(source, O_RDONLY);
  85                 if (ifd < 0 || fstat(ifd, &st) < 0) {
  86                         if (ifd >= 0)
  87                                 close(ifd);
  88                         fprintf(stderr, "cannot open %s\n", source);
  89                         return -1;
  90                 }
  91                 map = mmap(NULL, st.st_size, PROT_READ, MAP_PRIVATE, ifd, 0);
  92                 close(ifd);
  93                 if (map == MAP_FAILED) {
  94                         fprintf(stderr, "cannot mmap %s\n", source);
  95                         return -1;
  96                 }
  97                 ofd = open(dest, O_WRONLY | O_CREAT | O_EXCL, 0666);
  98                 status = ((ofd < 0) ||
  99                           (write(ofd, map, st.st_size) != st.st_size));
 100                 munmap(map, st.st_size);
 101                 if (ofd >= 0)
 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));
 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));
 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         const 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);
 158 }
 159
 160 int fetch(unsigned char *sha1)
 161 {
 162         return fetch_file(sha1) && fetch_pack(sha1);
 163 }
 164
 165 int fetch_ref(char *ref, unsigned char *sha1)
 166 {
 167         static int ref_name_start = -1;
 168         static char filename[PATH_MAX];
 169         static char hex[41];
 170         int ifd;
 171
 172         if (ref_name_start < 0) {
 173                 sprintf(filename, "%s/refs/", path);
 174                 ref_name_start = strlen(filename);
 175         }
 176         strcpy(filename + ref_name_start, ref);
 177         ifd = open(filename, O_RDONLY);
 178         if (ifd < 0) {
 179                 close(ifd);
 180                 fprintf(stderr, "cannot open %s\n", filename);
 181                 return -1;
 182         }
 183         if (read(ifd, hex, 40) != 40 || get_sha1_hex(hex, sha1)) {
 184                 close(ifd);
 185                 fprintf(stderr, "cannot read from %s\n", filename);
 186                 return -1;
 187         }
 188         close(ifd);
 189         pull_say("ref %s\n", sha1_to_hex(sha1));
 190         return 0;
 191 }
 192
 193 static const char local_pull_usage[] =
 194 "git-local-fetch [-c] [-t] [-a] [-d] [-v] [-w filename] [--recover] [-l] [-s] [-n] commit-id path";
 195
 196 /*
 197  * By default we only use file copy.
 198  * If -l is specified, a hard link is attempted.
 199  * If -s is specified, then a symlink is attempted.
 200  * If -n is _not_ specified, then a regular file-to-file copy is done.
 201  */
 202 int main(int argc, char **argv)
 203 {
 204         char *commit_id;
 205         int arg = 1;
 206
 207         while (arg < argc && argv[arg][0] == '-') {
 208                 if (argv[arg][1] == 't')
 209                         get_tree = 1;
 210                 else if (argv[arg][1] == 'c')
 211                         get_history = 1;
 212                 else if (argv[arg][1] == 'a') {
 213                         get_all = 1;
 214                         get_tree = 1;
 215                         get_history = 1;
 216                 }
 217                 else if (argv[arg][1] == 'l')
 218                         use_link = 1;
 219                 else if (argv[arg][1] == 's')
 220                         use_symlink = 1;
 221                 else if (argv[arg][1] == 'n')
 222                         use_filecopy = 0;
 223                 else if (argv[arg][1] == 'v')
 224                         get_verbosely = 1;
 225                 else if (argv[arg][1] == 'w')
 226                         write_ref = argv[++arg];
 227                 else
 228                         usage(local_pull_usage);
 229                 arg++;
 230         }
 231         if (argc < arg + 2)
 232                 usage(local_pull_usage);
 233         commit_id = argv[arg];
 234         path = argv[arg + 1];
 235
 236         if (pull(commit_id))
 237                 return 1;
 238
 239         return 0;
 240 }