http-fetch.c

   1 #include "cache.h"
   2 #include "commit.h"
   3
   4 #include "fetch.h"
   5
   6 #include <curl/curl.h>
   7 #include <curl/easy.h>
   8
   9 #if LIBCURL_VERSION_NUM < 0x070704
  10 #define curl_global_cleanup() do { /* nothing */ } while(0)
  11 #endif
  12 #if LIBCURL_VERSION_NUM < 0x070800
  13 #define curl_global_init(a) do { /* nothing */ } while(0)
  14 #endif
  15
  16 static CURL *curl;
  17
  18 static char *base;
  19
  20 static SHA_CTX c;
  21 static z_stream stream;
  22
  23 static int local;
  24 static int zret;
  25
  26 static int curl_ssl_verify;
  27
  28 struct buffer
  29 {
  30         size_t posn;
  31         size_t size;
  32         void *buffer;
  33 };
  34
  35 static size_t fwrite_buffer(void *ptr, size_t eltsize, size_t nmemb,
  36                             struct buffer *buffer)
  37 {
  38         size_t size = eltsize * nmemb;
  39         if (size > buffer->size - buffer->posn)
  40                 size = buffer->size - buffer->posn;
  41         memcpy(buffer->buffer + buffer->posn, ptr, size);
  42         buffer->posn += size;
  43         return size;
  44 }
  45
  46 static size_t fwrite_sha1_file(void *ptr, size_t eltsize, size_t nmemb,
  47                                void *data)
  48 {
  49         unsigned char expn[4096];
  50         size_t size = eltsize * nmemb;
  51         int posn = 0;
  52         do {
  53                 ssize_t retval = write(local, ptr + posn, size - posn);
  54                 if (retval < 0)
  55                         return posn;
  56                 posn += retval;
  57         } while (posn < size);
  58
  59         stream.avail_in = size;
  60         stream.next_in = ptr;
  61         do {
  62                 stream.next_out = expn;
  63                 stream.avail_out = sizeof(expn);
  64                 zret = inflate(&stream, Z_SYNC_FLUSH);
  65                 SHA1_Update(&c, expn, sizeof(expn) - stream.avail_out);
  66         } while (stream.avail_in && zret == Z_OK);
  67         return size;
  68 }
  69
  70 void prefetch(unsigned char *sha1)
  71 {
  72 }
  73
  74 static int got_indices = 0;
  75
  76 static struct packed_git *packs = NULL;
  77
  78 static int fetch_index(unsigned char *sha1)
  79 {
  80         char *filename;
  81         char *url;
  82
  83         FILE *indexfile;
  84
  85         if (has_pack_index(sha1))
  86                 return 0;
  87
  88         if (get_verbosely)
  89                 fprintf(stderr, "Getting index for pack %s\n",
  90                         sha1_to_hex(sha1));
  91
  92         url = xmalloc(strlen(base) + 64);
  93         sprintf(url, "%s/objects/pack/pack-%s.idx",
  94                 base, sha1_to_hex(sha1));
  95
  96         filename = sha1_pack_index_name(sha1);
  97         indexfile = fopen(filename, "w");
  98         if (!indexfile)
  99                 return error("Unable to open local file %s for pack index",
 100                              filename);
 101
 102         curl_easy_setopt(curl, CURLOPT_FILE, indexfile);
 103         curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, fwrite);
 104         curl_easy_setopt(curl, CURLOPT_URL, url);
 105
 106         if (curl_easy_perform(curl)) {
 107                 fclose(indexfile);
 108                 return error("Unable to get pack index %s", url);
 109         }
 110
 111         fclose(indexfile);
 112         return 0;
 113 }
 114
 115 static int setup_index(unsigned char *sha1)
 116 {
 117         struct packed_git *new_pack;
 118         if (has_pack_file(sha1))
 119                 return 0; // don't list this as something we can get
 120
 121         if (fetch_index(sha1))
 122                 return -1;
 123
 124         new_pack = parse_pack_index(sha1);
 125         new_pack->next = packs;
 126         packs = new_pack;
 127         return 0;
 128 }
 129
 130 static int fetch_indices(void)
 131 {
 132         unsigned char sha1[20];
 133         char *url;
 134         struct buffer buffer;
 135         char *data;
 136         int i = 0;
 137
 138         if (got_indices)
 139                 return 0;
 140
 141         data = xmalloc(4096);
 142         buffer.size = 4096;
 143         buffer.posn = 0;
 144         buffer.buffer = data;
 145
 146         if (get_verbosely)
 147                 fprintf(stderr, "Getting pack list\n");
 148
 149         url = xmalloc(strlen(base) + 21);
 150         sprintf(url, "%s/objects/info/packs", base);
 151
 152         curl_easy_setopt(curl, CURLOPT_FILE, &buffer);
 153         curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
 154         curl_easy_setopt(curl, CURLOPT_URL, url);
 155
 156         if (curl_easy_perform(curl)) {
 157                 return error("Unable to get pack index %s", url);
 158         }
 159
 160         do {
 161                 switch (data[i]) {
 162                 case 'P':
 163                         i++;
 164                         if (i + 52 < buffer.posn &&
 165                             !strncmp(data + i, " pack-", 6) &&
 166                             !strncmp(data + i + 46, ".pack\n", 6)) {
 167                                 get_sha1_hex(data + i + 6, sha1);
 168                                 setup_index(sha1);
 169                                 i += 51;
 170                                 break;
 171                         }
 172                 default:
 173                         while (data[i] != '\n')
 174                                 i++;
 175                 }
 176                 i++;
 177         } while (i < buffer.posn);
 178
 179         got_indices = 1;
 180         return 0;
 181 }
 182
 183 static int fetch_pack(unsigned char *sha1)
 184 {
 185         char *url;
 186         struct packed_git *target;
 187         struct packed_git **lst;
 188         FILE *packfile;
 189         char *filename;
 190
 191         if (fetch_indices())
 192                 return -1;
 193         target = find_sha1_pack(sha1, packs);
 194         if (!target)
 195                 return error("Couldn't get %s: not separate or in any pack",
 196                              sha1_to_hex(sha1));
 197
 198         if (get_verbosely) {
 199                 fprintf(stderr, "Getting pack %s\n",
 200                         sha1_to_hex(target->sha1));
 201                 fprintf(stderr, " which contains %s\n",
 202                         sha1_to_hex(sha1));
 203         }
 204
 205         url = xmalloc(strlen(base) + 65);
 206         sprintf(url, "%s/objects/pack/pack-%s.pack",
 207                 base, sha1_to_hex(target->sha1));
 208
 209         filename = sha1_pack_name(target->sha1);
 210         packfile = fopen(filename, "w");
 211         if (!packfile)
 212                 return error("Unable to open local file %s for pack",
 213                              filename);
 214
 215         curl_easy_setopt(curl, CURLOPT_FILE, packfile);
 216         curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, fwrite);
 217         curl_easy_setopt(curl, CURLOPT_URL, url);
 218
 219         if (curl_easy_perform(curl)) {
 220                 fclose(packfile);
 221                 return error("Unable to get pack file %s", url);
 222         }
 223
 224         fclose(packfile);
 225
 226         lst = &packs;
 227         while (*lst != target)
 228                 lst = &((*lst)->next);
 229         *lst = (*lst)->next;
 230
 231         install_packed_git(target);
 232
 233         return 0;
 234 }
 235
 236 int fetch(unsigned char *sha1)
 237 {
 238         char *hex = sha1_to_hex(sha1);
 239         char *filename = sha1_file_name(sha1);
 240         unsigned char real_sha1[20];
 241         char *url;
 242         char *posn;
 243
 244         local = open(filename, O_WRONLY | O_CREAT | O_EXCL, 0666);
 245
 246         if (local < 0)
 247                 return error("Couldn't open local object %s\n", filename);
 248
 249         memset(&stream, 0, sizeof(stream));
 250
 251         inflateInit(&stream);
 252
 253         SHA1_Init(&c);
 254
 255         curl_easy_setopt(curl, CURLOPT_FAILONERROR, 1);
 256         curl_easy_setopt(curl, CURLOPT_FILE, NULL);
 257         curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, fwrite_sha1_file);
 258
 259         url = xmalloc(strlen(base) + 50);
 260         strcpy(url, base);
 261         posn = url + strlen(base);
 262         strcpy(posn, "objects/");
 263         posn += 8;
 264         memcpy(posn, hex, 2);
 265         posn += 2;
 266         *(posn++) = '/';
 267         strcpy(posn, hex + 2);
 268
 269         curl_easy_setopt(curl, CURLOPT_URL, url);
 270
 271         if (curl_easy_perform(curl)) {
 272                 unlink(filename);
 273                 if (fetch_pack(sha1))
 274                         return error("Tried %s", url);
 275                 return 0;
 276         }
 277
 278         close(local);
 279         inflateEnd(&stream);
 280         SHA1_Final(real_sha1, &c);
 281         if (zret != Z_STREAM_END) {
 282                 unlink(filename);
 283                 return error("File %s (%s) corrupt\n", hex, url);
 284         }
 285         if (memcmp(sha1, real_sha1, 20)) {
 286                 unlink(filename);
 287                 return error("File %s has bad hash\n", hex);
 288         }
 289
 290         pull_say("got %s\n", hex);
 291         return 0;
 292 }
 293
 294 int fetch_ref(char *ref, unsigned char *sha1)
 295 {
 296         char *url, *posn;
 297         char hex[42];
 298         struct buffer buffer;
 299         buffer.size = 41;
 300         buffer.posn = 0;
 301         buffer.buffer = hex;
 302         hex[41] = '\0';
 303
 304         curl_easy_setopt(curl, CURLOPT_FILE, &buffer);
 305         curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
 306
 307         url = xmalloc(strlen(base) + 6 + strlen(ref));
 308         strcpy(url, base);
 309         posn = url + strlen(base);
 310         strcpy(posn, "refs/");
 311         posn += 5;
 312         strcpy(posn, ref);
 313
 314         curl_easy_setopt(curl, CURLOPT_URL, url);
 315
 316         if (curl_easy_perform(curl))
 317                 return error("Couldn't get %s for %s\n", url, ref);
 318
 319         hex[40] = '\0';
 320         get_sha1_hex(hex, sha1);
 321         return 0;
 322 }
 323
 324 int main(int argc, char **argv)
 325 {
 326         char *commit_id;
 327         char *url;
 328         int arg = 1;
 329
 330         while (arg < argc && argv[arg][0] == '-') {
 331                 if (argv[arg][1] == 't') {
 332                         get_tree = 1;
 333                 } else if (argv[arg][1] == 'c') {
 334                         get_history = 1;
 335                 } else if (argv[arg][1] == 'a') {
 336                         get_all = 1;
 337                         get_tree = 1;
 338                         get_history = 1;
 339                 } else if (argv[arg][1] == 'v') {
 340                         get_verbosely = 1;
 341                 } else if (argv[arg][1] == 'w') {
 342                         write_ref = argv[arg + 1];
 343                         arg++;
 344                 }
 345                 arg++;
 346         }
 347         if (argc < arg + 2) {
 348                 usage("git-http-fetch [-c] [-t] [-a] [-d] [-v] [--recover] [-w ref] commit-id url");
 349                 return 1;
 350         }
 351         commit_id = argv[arg];
 352         url = argv[arg + 1];
 353
 354         curl_global_init(CURL_GLOBAL_ALL);
 355
 356         curl = curl_easy_init();
 357
 358         curl_ssl_verify = gitenv("GIT_SSL_NO_VERIFY") ? 0 : 1;
 359         curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, curl_ssl_verify);
 360 #if LIBCURL_VERSION_NUM >= 0x070907
 361         curl_easy_setopt(curl, CURLOPT_NETRC, CURL_NETRC_OPTIONAL);
 362 #endif
 363
 364         base = url;
 365
 366         if (pull(commit_id))
 367                 return 1;
 368
 369         curl_global_cleanup();
 370         return 0;
 371 }