http-pull.c

   1 #include "cache.h"
   2 #include "commit.h"
   3
   4 #include "pull.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 static int got_indices = 0;
  71
  72 static struct packed_git *packs = NULL;
  73
  74 static int fetch_index(unsigned char *sha1)
  75 {
  76         char *filename;
  77         char *url;
  78
  79         FILE *indexfile;
  80
  81         if (has_pack_index(sha1))
  82                 return 0;
  83
  84         if (get_verbosely)
  85                 fprintf(stderr, "Getting index for pack %s\n",
  86                         sha1_to_hex(sha1));
  87
  88         url = xmalloc(strlen(base) + 64);
  89         sprintf(url, "%s/objects/pack/pack-%s.idx",
  90                 base, sha1_to_hex(sha1));
  91
  92         filename = sha1_pack_index_name(sha1);
  93         indexfile = fopen(filename, "w");
  94         if (!indexfile)
  95                 return error("Unable to open local file %s for pack index",
  96                              filename);
  97
  98         curl_easy_setopt(curl, CURLOPT_FILE, indexfile);
  99         curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, fwrite);
 100         curl_easy_setopt(curl, CURLOPT_URL, url);
 101
 102         if (curl_easy_perform(curl)) {
 103                 fclose(indexfile);
 104                 return error("Unable to get pack index %s", url);
 105         }
 106
 107         fclose(indexfile);
 108         return 0;
 109 }
 110
 111 static int setup_index(unsigned char *sha1)
 112 {
 113         struct packed_git *new_pack;
 114         if (has_pack_file(sha1))
 115                 return 0; // don't list this as something we can get
 116
 117         if (fetch_index(sha1))
 118                 return -1;
 119
 120         new_pack = parse_pack_index(sha1);
 121         new_pack->next = packs;
 122         packs = new_pack;
 123         return 0;
 124 }
 125
 126 static int fetch_indices(void)
 127 {
 128         unsigned char sha1[20];
 129         char *url;
 130         struct buffer buffer;
 131         char *data;
 132         int i = 0;
 133
 134         if (got_indices)
 135                 return 0;
 136
 137         data = xmalloc(4096);
 138         buffer.size = 4096;
 139         buffer.posn = 0;
 140         buffer.buffer = data;
 141
 142         if (get_verbosely)
 143                 fprintf(stderr, "Getting pack list\n");
 144
 145         url = xmalloc(strlen(base) + 21);
 146         sprintf(url, "%s/objects/info/packs", base);
 147
 148         curl_easy_setopt(curl, CURLOPT_FILE, &buffer);
 149         curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
 150         curl_easy_setopt(curl, CURLOPT_URL, url);
 151
 152         if (curl_easy_perform(curl)) {
 153                 return error("Unable to get pack index %s", url);
 154         }
 155
 156         do {
 157                 switch (data[i]) {
 158                 case 'P':
 159                         i++;
 160                         if (i + 52 < buffer.posn &&
 161                             !strncmp(data + i, " pack-", 6) &&
 162                             !strncmp(data + i + 46, ".pack\n", 6)) {
 163                                 get_sha1_hex(data + i + 6, sha1);
 164                                 setup_index(sha1);
 165                                 i += 51;
 166                                 break;
 167                         }
 168                 default:
 169                         while (data[i] != '\n')
 170                                 i++;
 171                 }
 172                 i++;
 173         } while (i < buffer.posn);
 174
 175         got_indices = 1;
 176         return 0;
 177 }
 178
 179 static int fetch_pack(unsigned char *sha1)
 180 {
 181         char *url;
 182         struct packed_git *target;
 183         struct packed_git **lst;
 184         FILE *packfile;
 185         char *filename;
 186
 187         if (fetch_indices())
 188                 return -1;
 189         target = find_sha1_pack(sha1, packs);
 190         if (!target)
 191                 return error("Couldn't get %s: not separate or in any pack",
 192                              sha1_to_hex(sha1));
 193
 194         if (get_verbosely) {
 195                 fprintf(stderr, "Getting pack %s\n",
 196                         sha1_to_hex(target->sha1));
 197                 fprintf(stderr, " which contains %s\n",
 198                         sha1_to_hex(sha1));
 199         }
 200
 201         url = xmalloc(strlen(base) + 65);
 202         sprintf(url, "%s/objects/pack/pack-%s.pack",
 203                 base, sha1_to_hex(target->sha1));
 204
 205         filename = sha1_pack_name(target->sha1);
 206         packfile = fopen(filename, "w");
 207         if (!packfile)
 208                 return error("Unable to open local file %s for pack",
 209                              filename);
 210
 211         curl_easy_setopt(curl, CURLOPT_FILE, packfile);
 212         curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, fwrite);
 213         curl_easy_setopt(curl, CURLOPT_URL, url);
 214
 215         if (curl_easy_perform(curl)) {
 216                 fclose(packfile);
 217                 return error("Unable to get pack file %s", url);
 218         }
 219
 220         fclose(packfile);
 221
 222         lst = &packs;
 223         while (*lst != target)
 224                 lst = &((*lst)->next);
 225         *lst = (*lst)->next;
 226
 227         install_packed_git(target);
 228
 229         return 0;
 230 }
 231
 232 int fetch(unsigned char *sha1)
 233 {
 234         char *hex = sha1_to_hex(sha1);
 235         char *filename = sha1_file_name(sha1);
 236         unsigned char real_sha1[20];
 237         char *url;
 238         char *posn;
 239
 240         local = open(filename, O_WRONLY | O_CREAT | O_EXCL, 0666);
 241
 242         if (local < 0)
 243                 return error("Couldn't open local object %s\n", filename);
 244
 245         memset(&stream, 0, sizeof(stream));
 246
 247         inflateInit(&stream);
 248
 249         SHA1_Init(&c);
 250
 251         curl_easy_setopt(curl, CURLOPT_FAILONERROR, 1);
 252         curl_easy_setopt(curl, CURLOPT_FILE, NULL);
 253         curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, fwrite_sha1_file);
 254
 255         url = xmalloc(strlen(base) + 50);
 256         strcpy(url, base);
 257         posn = url + strlen(base);
 258         strcpy(posn, "objects/");
 259         posn += 8;
 260         memcpy(posn, hex, 2);
 261         posn += 2;
 262         *(posn++) = '/';
 263         strcpy(posn, hex + 2);
 264
 265         curl_easy_setopt(curl, CURLOPT_URL, url);
 266
 267         if (curl_easy_perform(curl)) {
 268                 unlink(filename);
 269                 if (fetch_pack(sha1))
 270                         return error("Tried %s", url);
 271                 return 0;
 272         }
 273
 274         close(local);
 275         inflateEnd(&stream);
 276         SHA1_Final(real_sha1, &c);
 277         if (zret != Z_STREAM_END) {
 278                 unlink(filename);
 279                 return error("File %s (%s) corrupt\n", hex, url);
 280         }
 281         if (memcmp(sha1, real_sha1, 20)) {
 282                 unlink(filename);
 283                 return error("File %s has bad hash\n", hex);
 284         }
 285
 286         pull_say("got %s\n", hex);
 287         return 0;
 288 }
 289
 290 int fetch_ref(char *ref, unsigned char *sha1)
 291 {
 292         char *url, *posn;
 293         char hex[42];
 294         struct buffer buffer;
 295         buffer.size = 41;
 296         buffer.posn = 0;
 297         buffer.buffer = hex;
 298         hex[41] = '\0';
 299
 300         curl_easy_setopt(curl, CURLOPT_FILE, &buffer);
 301         curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
 302
 303         url = xmalloc(strlen(base) + 6 + strlen(ref));
 304         strcpy(url, base);
 305         posn = url + strlen(base);
 306         strcpy(posn, "refs/");
 307         posn += 5;
 308         strcpy(posn, ref);
 309
 310         curl_easy_setopt(curl, CURLOPT_URL, url);
 311
 312         if (curl_easy_perform(curl))
 313                 return error("Couldn't get %s for %s\n", url, ref);
 314
 315         hex[40] = '\0';
 316         get_sha1_hex(hex, sha1);
 317         return 0;
 318 }
 319
 320 int main(int argc, char **argv)
 321 {
 322         char *commit_id;
 323         char *url;
 324         int arg = 1;
 325
 326         while (arg < argc && argv[arg][0] == '-') {
 327                 if (argv[arg][1] == 't') {
 328                         get_tree = 1;
 329                 } else if (argv[arg][1] == 'c') {
 330                         get_history = 1;
 331                 } else if (argv[arg][1] == 'a') {
 332                         get_all = 1;
 333                         get_tree = 1;
 334                         get_history = 1;
 335                 } else if (argv[arg][1] == 'v') {
 336                         get_verbosely = 1;
 337                 } else if (argv[arg][1] == 'w') {
 338                         write_ref = argv[arg + 1];
 339                         arg++;
 340                 }
 341                 arg++;
 342         }
 343         if (argc < arg + 2) {
 344                 usage("git-http-pull [-c] [-t] [-a] [-d] [-v] [--recover] [-w ref] commit-id url");
 345                 return 1;
 346         }
 347         commit_id = argv[arg];
 348         url = argv[arg + 1];
 349
 350         curl_global_init(CURL_GLOBAL_ALL);
 351
 352         curl = curl_easy_init();
 353
 354         curl_ssl_verify = gitenv("GIT_SSL_NO_VERIFY") ? 0 : 1;
 355         curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, curl_ssl_verify);
 356 #if LIBCURL_VERSION_NUM >= 0x070907
 357         curl_easy_setopt(curl, CURLOPT_NETRC, CURL_NETRC_OPTIONAL);
 358 #endif
 359
 360         base = url;
 361
 362         if (pull(commit_id))
 363                 return 1;
 364
 365         curl_global_cleanup();
 366         return 0;
 367 }