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         while ((de = readdir(dir)) != NULL) {
  42                 int namelen = strlen(de->d_name);
  43                 if (namelen != 50 ||
  44                     strcmp(de->d_name + namelen - 5, ".pack"))
  45                         continue;
  46                 get_sha1_hex(de->d_name + 5, sha1);
  47                 setup_index(sha1);
  48         }
  49         return 0;
  50 }
  51
  52 static int copy_file(const char *source, const char *dest, const char *hex)
  53 {
  54         if (use_link) {
  55                 if (!link(source, dest)) {
  56                         pull_say("link %s\n", hex);
  57                         return 0;
  58                 }
  59                 /* If we got ENOENT there is no point continuing. */
  60                 if (errno == ENOENT) {
  61                         fprintf(stderr, "does not exist %s\n", source);
  62                         return -1;
  63                 }
  64         }
  65         if (use_symlink && !symlink(source, dest)) {
  66                 pull_say("symlink %s\n", hex);
  67                 return 0;
  68         }
  69         if (use_filecopy) {
  70                 int ifd, ofd, status;
  71                 struct stat st;
  72                 void *map;
  73                 ifd = open(source, O_RDONLY);
  74                 if (ifd < 0 || fstat(ifd, &st) < 0) {
  75                         close(ifd);
  76                         fprintf(stderr, "cannot open %s\n", source);
  77                         return -1;
  78                 }
  79                 map = mmap(NULL, st.st_size, PROT_READ, MAP_PRIVATE, ifd, 0);
  80                 close(ifd);
  81                 if (map == MAP_FAILED) {
  82                         fprintf(stderr, "cannot mmap %s\n", source);
  83                         return -1;
  84                 }
  85                 ofd = open(dest, O_WRONLY | O_CREAT | O_EXCL, 0666);
  86                 status = ((ofd < 0) ||
  87                           (write(ofd, map, st.st_size) != st.st_size));
  88                 munmap(map, st.st_size);
  89                 close(ofd);
  90                 if (status)
  91                         fprintf(stderr, "cannot write %s\n", dest);
  92                 else
  93                         pull_say("copy %s\n", hex);
  94                 return status;
  95         }
  96         fprintf(stderr, "failed to copy %s with given copy methods.\n", hex);
  97         return -1;
  98 }
  99
 100 static int fetch_pack(const unsigned char *sha1)
 101 {
 102         struct packed_git *target;
 103         char filename[PATH_MAX];
 104         if (setup_indices())
 105                 return -1;
 106         target = find_sha1_pack(sha1, packs);
 107         if (!target)
 108                 return error("Couldn't find %s: not separate or in any pack",
 109                              sha1_to_hex(sha1));
 110         if (get_verbosely) {
 111                 fprintf(stderr, "Getting pack %s\n",
 112                         sha1_to_hex(target->sha1));
 113                 fprintf(stderr, " which contains %s\n",
 114                         sha1_to_hex(sha1));
 115         }
 116         sprintf(filename, "%s/objects/pack/pack-%s.pack",
 117                 path, sha1_to_hex(target->sha1));
 118         copy_file(filename, sha1_pack_name(target->sha1),
 119                   sha1_to_hex(target->sha1));
 120         sprintf(filename, "%s/objects/pack/pack-%s.idx",
 121                 path, sha1_to_hex(target->sha1));
 122         copy_file(filename, sha1_pack_index_name(target->sha1),
 123                   sha1_to_hex(target->sha1));
 124         install_packed_git(target);
 125         return 0;
 126 }
 127
 128 static int fetch_file(const unsigned char *sha1)
 129 {
 130         static int object_name_start = -1;
 131         static char filename[PATH_MAX];
 132         char *hex = sha1_to_hex(sha1);
 133         const char *dest_filename = sha1_file_name(sha1);
 134
 135         if (object_name_start < 0) {
 136                 strcpy(filename, path); /* e.g. git.git */
 137                 strcat(filename, "/objects/");
 138                 object_name_start = strlen(filename);
 139         }
 140         filename[object_name_start+0] = hex[0];
 141         filename[object_name_start+1] = hex[1];
 142         filename[object_name_start+2] = '/';
 143         strcpy(filename + object_name_start + 3, hex + 2);
 144         return copy_file(filename, dest_filename, hex);
 145 }
 146
 147 int fetch(unsigned char *sha1)
 148 {
 149         return fetch_file(sha1) && fetch_pack(sha1);
 150 }
 151
 152 int fetch_ref(char *ref, unsigned char *sha1)
 153 {
 154         static int ref_name_start = -1;
 155         static char filename[PATH_MAX];
 156         static char hex[41];
 157         int ifd;
 158
 159         if (ref_name_start < 0) {
 160                 sprintf(filename, "%s/refs/", path);
 161                 ref_name_start = strlen(filename);
 162         }
 163         strcpy(filename + ref_name_start, ref);
 164         ifd = open(filename, O_RDONLY);
 165         if (ifd < 0) {
 166                 close(ifd);
 167                 fprintf(stderr, "cannot open %s\n", filename);
 168                 return -1;
 169         }
 170         if (read(ifd, hex, 40) != 40 || get_sha1_hex(hex, sha1)) {
 171                 close(ifd);
 172                 fprintf(stderr, "cannot read from %s\n", filename);
 173                 return -1;
 174         }
 175         close(ifd);
 176         pull_say("ref %s\n", sha1_to_hex(sha1));
 177         return 0;
 178 }
 179
 180 static const char local_pull_usage[] =
 181 "git-local-fetch [-c] [-t] [-a] [-d] [-v] [-w filename] [--recover] [-l] [-s] [-n] commit-id path";
 182
 183 /*
 184  * By default we only use file copy.
 185  * If -l is specified, a hard link is attempted.
 186  * If -s is specified, then a symlink is attempted.
 187  * If -n is _not_ specified, then a regular file-to-file copy is done.
 188  */
 189 int main(int argc, char **argv)
 190 {
 191         char *commit_id;
 192         int arg = 1;
 193
 194         while (arg < argc && argv[arg][0] == '-') {
 195                 if (argv[arg][1] == 't')
 196                         get_tree = 1;
 197                 else if (argv[arg][1] == 'c')
 198                         get_history = 1;
 199                 else if (argv[arg][1] == 'a') {
 200                         get_all = 1;
 201                         get_tree = 1;
 202                         get_history = 1;
 203                 }
 204                 else if (argv[arg][1] == 'l')
 205                         use_link = 1;
 206                 else if (argv[arg][1] == 's')
 207                         use_symlink = 1;
 208                 else if (argv[arg][1] == 'n')
 209                         use_filecopy = 0;
 210                 else if (argv[arg][1] == 'v')
 211                         get_verbosely = 1;
 212                 else if (argv[arg][1] == 'w')
 213                         write_ref = argv[++arg];
 214                 else
 215                         usage(local_pull_usage);
 216                 arg++;
 217         }
 218         if (argc < arg + 2)
 219                 usage(local_pull_usage);
 220         commit_id = argv[arg];
 221         path = argv[arg + 1];
 222
 223         if (pull(commit_id))
 224                 return 1;
 225
 226         return 0;
 227 }