Andrew's git / gitweb.git / http-fetch.c
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http-fetch.con commit Merge branch 'master' of . (8ac93bc)
   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
  16static CURL *curl;
  17static struct curl_slist *no_pragma_header;
  18
  19static char *initial_base;
  20
  21struct alt_base
  22{
  23        char *base;
  24        int got_indices;
  25        struct packed_git *packs;
  26        struct alt_base *next;
  27};
  28
  29struct alt_base *alt = NULL;
  30
  31static SHA_CTX c;
  32static z_stream stream;
  33
  34static int local;
  35static int zret;
  36
  37static int curl_ssl_verify;
  38
  39struct buffer
  40{
  41        size_t posn;
  42        size_t size;
  43        void *buffer;
  44};
  45
  46static size_t fwrite_buffer(void *ptr, size_t eltsize, size_t nmemb,
  47                            struct buffer *buffer)
  48{
  49        size_t size = eltsize * nmemb;
  50        if (size > buffer->size - buffer->posn)
  51                size = buffer->size - buffer->posn;
  52        memcpy(buffer->buffer + buffer->posn, ptr, size);
  53        buffer->posn += size;
  54        return size;
  55}
  56
  57static size_t fwrite_sha1_file(void *ptr, size_t eltsize, size_t nmemb,
  58                               void *data)
  59{
  60        unsigned char expn[4096];
  61        size_t size = eltsize * nmemb;
  62        int posn = 0;
  63        do {
  64                ssize_t retval = write(local, ptr + posn, size - posn);
  65                if (retval < 0)
  66                        return posn;
  67                posn += retval;
  68        } while (posn < size);
  69
  70        stream.avail_in = size;
  71        stream.next_in = ptr;
  72        do {
  73                stream.next_out = expn;
  74                stream.avail_out = sizeof(expn);
  75                zret = inflate(&stream, Z_SYNC_FLUSH);
  76                SHA1_Update(&c, expn, sizeof(expn) - stream.avail_out);
  77        } while (stream.avail_in && zret == Z_OK);
  78        return size;
  79}
  80
  81void prefetch(unsigned char *sha1)
  82{
  83}
  84
  85static int got_alternates = 0;
  86
  87static int fetch_index(struct alt_base *repo, unsigned char *sha1)
  88{
  89        char *filename;
  90        char *url;
  91
  92        FILE *indexfile;
  93
  94        if (has_pack_index(sha1))
  95                return 0;
  96
  97        if (get_verbosely)
  98                fprintf(stderr, "Getting index for pack %s\n",
  99                        sha1_to_hex(sha1));
 100        
 101        url = xmalloc(strlen(repo->base) + 64);
 102        sprintf(url, "%s/objects/pack/pack-%s.idx",
 103                repo->base, sha1_to_hex(sha1));
 104        
 105        filename = sha1_pack_index_name(sha1);
 106        indexfile = fopen(filename, "w");
 107        if (!indexfile)
 108                return error("Unable to open local file %s for pack index",
 109                             filename);
 110
 111        curl_easy_setopt(curl, CURLOPT_FILE, indexfile);
 112        curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, fwrite);
 113        curl_easy_setopt(curl, CURLOPT_URL, url);
 114        curl_easy_setopt(curl, CURLOPT_HTTPHEADER, no_pragma_header);
 115        
 116        if (curl_easy_perform(curl)) {
 117                fclose(indexfile);
 118                return error("Unable to get pack index %s", url);
 119        }
 120
 121        fclose(indexfile);
 122        return 0;
 123}
 124
 125static int setup_index(struct alt_base *repo, unsigned char *sha1)
 126{
 127        struct packed_git *new_pack;
 128        if (has_pack_file(sha1))
 129                return 0; // don't list this as something we can get
 130
 131        if (fetch_index(repo, sha1))
 132                return -1;
 133
 134        new_pack = parse_pack_index(sha1);
 135        new_pack->next = repo->packs;
 136        repo->packs = new_pack;
 137        return 0;
 138}
 139
 140static int fetch_alternates(char *base)
 141{
 142        int ret = 0;
 143        struct buffer buffer;
 144        char *url;
 145        char *data;
 146        int i = 0;
 147        if (got_alternates)
 148                return 0;
 149        data = xmalloc(4096);
 150        buffer.size = 4096;
 151        buffer.posn = 0;
 152        buffer.buffer = data;
 153
 154        if (get_verbosely)
 155                fprintf(stderr, "Getting alternates list\n");
 156        
 157        url = xmalloc(strlen(base) + 31);
 158        sprintf(url, "%s/objects/info/http-alternates", base);
 159
 160        curl_easy_setopt(curl, CURLOPT_FILE, &buffer);
 161        curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
 162        curl_easy_setopt(curl, CURLOPT_URL, url);
 163
 164        if (curl_easy_perform(curl) || !buffer.posn) {
 165                sprintf(url, "%s/objects/info/alternates", base);
 166                
 167                curl_easy_setopt(curl, CURLOPT_FILE, &buffer);
 168                curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
 169                curl_easy_setopt(curl, CURLOPT_URL, url);
 170                
 171                if (curl_easy_perform(curl)) {
 172                        return 0;
 173                }
 174        }
 175
 176        while (i < buffer.posn) {
 177                int posn = i;
 178                while (posn < buffer.posn && data[posn] != '\n')
 179                        posn++;
 180                if (data[posn] == '\n') {
 181                        if (data[i] == '/') {
 182                                int serverlen = strchr(base + 8, '/') - base;
 183                                // skip 'objects' at end
 184                                char *target = 
 185                                        xmalloc(serverlen + posn - i - 6);
 186                                struct alt_base *newalt;
 187                                strncpy(target, base, serverlen);
 188                                strncpy(target + serverlen, data + i,
 189                                        posn - i - 7);
 190                                target[serverlen + posn - i - 7] = '\0';
 191                                if (get_verbosely)
 192                                        fprintf(stderr, 
 193                                                "Also look at %s\n", target);
 194                                newalt = xmalloc(sizeof(*newalt));
 195                                newalt->next = alt;
 196                                newalt->base = target;
 197                                newalt->got_indices = 0;
 198                                newalt->packs = NULL;
 199                                alt = newalt;
 200                                ret++;
 201                        }
 202                }
 203                i = posn + 1;
 204        }
 205        got_alternates = 1;
 206        
 207        return ret;
 208}
 209
 210static int fetch_indices(struct alt_base *repo)
 211{
 212        unsigned char sha1[20];
 213        char *url;
 214        struct buffer buffer;
 215        char *data;
 216        int i = 0;
 217
 218        if (repo->got_indices)
 219                return 0;
 220
 221        data = xmalloc(4096);
 222        buffer.size = 4096;
 223        buffer.posn = 0;
 224        buffer.buffer = data;
 225
 226        if (get_verbosely)
 227                fprintf(stderr, "Getting pack list\n");
 228        
 229        url = xmalloc(strlen(repo->base) + 21);
 230        sprintf(url, "%s/objects/info/packs", repo->base);
 231
 232        curl_easy_setopt(curl, CURLOPT_FILE, &buffer);
 233        curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
 234        curl_easy_setopt(curl, CURLOPT_URL, url);
 235        curl_easy_setopt(curl, CURLOPT_HTTPHEADER, NULL);
 236        
 237        if (curl_easy_perform(curl)) {
 238                return error("Unable to get pack index %s", url);
 239        }
 240
 241        while (i < buffer.posn) {
 242                switch (data[i]) {
 243                case 'P':
 244                        i++;
 245                        if (i + 52 < buffer.posn &&
 246                            !strncmp(data + i, " pack-", 6) &&
 247                            !strncmp(data + i + 46, ".pack\n", 6)) {
 248                                get_sha1_hex(data + i + 6, sha1);
 249                                setup_index(repo, sha1);
 250                                i += 51;
 251                                break;
 252                        }
 253                default:
 254                        while (data[i] != '\n')
 255                                i++;
 256                }
 257                i++;
 258        }
 259
 260        repo->got_indices = 1;
 261        return 0;
 262}
 263
 264static int fetch_pack(struct alt_base *repo, unsigned char *sha1)
 265{
 266        char *url;
 267        struct packed_git *target;
 268        struct packed_git **lst;
 269        FILE *packfile;
 270        char *filename;
 271
 272        if (fetch_indices(repo))
 273                return -1;
 274        target = find_sha1_pack(sha1, repo->packs);
 275        if (!target)
 276                return -1;
 277
 278        if (get_verbosely) {
 279                fprintf(stderr, "Getting pack %s\n",
 280                        sha1_to_hex(target->sha1));
 281                fprintf(stderr, " which contains %s\n",
 282                        sha1_to_hex(sha1));
 283        }
 284
 285        url = xmalloc(strlen(repo->base) + 65);
 286        sprintf(url, "%s/objects/pack/pack-%s.pack",
 287                repo->base, sha1_to_hex(target->sha1));
 288
 289        filename = sha1_pack_name(target->sha1);
 290        packfile = fopen(filename, "w");
 291        if (!packfile)
 292                return error("Unable to open local file %s for pack",
 293                             filename);
 294
 295        curl_easy_setopt(curl, CURLOPT_FILE, packfile);
 296        curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, fwrite);
 297        curl_easy_setopt(curl, CURLOPT_URL, url);
 298        curl_easy_setopt(curl, CURLOPT_HTTPHEADER, no_pragma_header);
 299        
 300        if (curl_easy_perform(curl)) {
 301                fclose(packfile);
 302                return error("Unable to get pack file %s", url);
 303        }
 304
 305        fclose(packfile);
 306
 307        lst = &repo->packs;
 308        while (*lst != target)
 309                lst = &((*lst)->next);
 310        *lst = (*lst)->next;
 311
 312        install_packed_git(target);
 313
 314        return 0;
 315}
 316
 317int fetch_object(struct alt_base *repo, unsigned char *sha1)
 318{
 319        char *hex = sha1_to_hex(sha1);
 320        char *filename = sha1_file_name(sha1);
 321        unsigned char real_sha1[20];
 322        char *url;
 323        char *posn;
 324
 325        local = open(filename, O_WRONLY | O_CREAT | O_EXCL, 0666);
 326
 327        if (local < 0)
 328                return error("Couldn't open local object %s\n", filename);
 329
 330        memset(&stream, 0, sizeof(stream));
 331
 332        inflateInit(&stream);
 333
 334        SHA1_Init(&c);
 335
 336        curl_easy_setopt(curl, CURLOPT_FAILONERROR, 1);
 337        curl_easy_setopt(curl, CURLOPT_FILE, NULL);
 338        curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, fwrite_sha1_file);
 339        curl_easy_setopt(curl, CURLOPT_HTTPHEADER, no_pragma_header);
 340
 341        url = xmalloc(strlen(repo->base) + 50);
 342        strcpy(url, repo->base);
 343        posn = url + strlen(repo->base);
 344        strcpy(posn, "objects/");
 345        posn += 8;
 346        memcpy(posn, hex, 2);
 347        posn += 2;
 348        *(posn++) = '/';
 349        strcpy(posn, hex + 2);
 350
 351        curl_easy_setopt(curl, CURLOPT_URL, url);
 352
 353        if (curl_easy_perform(curl)) {
 354                unlink(filename);
 355                return -1;
 356        }
 357
 358        close(local);
 359        inflateEnd(&stream);
 360        SHA1_Final(real_sha1, &c);
 361        if (zret != Z_STREAM_END) {
 362                unlink(filename);
 363                return error("File %s (%s) corrupt\n", hex, url);
 364        }
 365        if (memcmp(sha1, real_sha1, 20)) {
 366                unlink(filename);
 367                return error("File %s has bad hash\n", hex);
 368        }
 369        
 370        pull_say("got %s\n", hex);
 371        return 0;
 372}
 373
 374int fetch(unsigned char *sha1)
 375{
 376        struct alt_base *altbase = alt;
 377        while (altbase) {
 378                if (!fetch_object(altbase, sha1))
 379                        return 0;
 380                if (!fetch_pack(altbase, sha1))
 381                        return 0;
 382                if (fetch_alternates(altbase->base) > 0) {
 383                        altbase = alt;
 384                        continue;
 385                }
 386                altbase = altbase->next;
 387        }
 388        return error("Unable to find %s under %s\n", sha1_to_hex(sha1), 
 389                     initial_base);
 390}
 391
 392int fetch_ref(char *ref, unsigned char *sha1)
 393{
 394        char *url, *posn;
 395        char hex[42];
 396        struct buffer buffer;
 397        char *base = initial_base;
 398        buffer.size = 41;
 399        buffer.posn = 0;
 400        buffer.buffer = hex;
 401        hex[41] = '\0';
 402        
 403        curl_easy_setopt(curl, CURLOPT_FILE, &buffer);
 404        curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
 405        curl_easy_setopt(curl, CURLOPT_HTTPHEADER, NULL);
 406
 407        url = xmalloc(strlen(base) + 6 + strlen(ref));
 408        strcpy(url, base);
 409        posn = url + strlen(base);
 410        strcpy(posn, "refs/");
 411        posn += 5;
 412        strcpy(posn, ref);
 413
 414        curl_easy_setopt(curl, CURLOPT_URL, url);
 415
 416        if (curl_easy_perform(curl))
 417                return error("Couldn't get %s for %s\n", url, ref);
 418
 419        hex[40] = '\0';
 420        get_sha1_hex(hex, sha1);
 421        return 0;
 422}
 423
 424int main(int argc, char **argv)
 425{
 426        char *commit_id;
 427        char *url;
 428        int arg = 1;
 429
 430        while (arg < argc && argv[arg][0] == '-') {
 431                if (argv[arg][1] == 't') {
 432                        get_tree = 1;
 433                } else if (argv[arg][1] == 'c') {
 434                        get_history = 1;
 435                } else if (argv[arg][1] == 'a') {
 436                        get_all = 1;
 437                        get_tree = 1;
 438                        get_history = 1;
 439                } else if (argv[arg][1] == 'v') {
 440                        get_verbosely = 1;
 441                } else if (argv[arg][1] == 'w') {
 442                        write_ref = argv[arg + 1];
 443                        arg++;
 444                }
 445                arg++;
 446        }
 447        if (argc < arg + 2) {
 448                usage("git-http-fetch [-c] [-t] [-a] [-d] [-v] [--recover] [-w ref] commit-id url");
 449                return 1;
 450        }
 451        commit_id = argv[arg];
 452        url = argv[arg + 1];
 453
 454        curl_global_init(CURL_GLOBAL_ALL);
 455
 456        curl = curl_easy_init();
 457        no_pragma_header = curl_slist_append(no_pragma_header, "Pragma:");
 458
 459        curl_ssl_verify = getenv("GIT_SSL_NO_VERIFY") ? 0 : 1;
 460        curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, curl_ssl_verify);
 461#if LIBCURL_VERSION_NUM >= 0x070907
 462        curl_easy_setopt(curl, CURLOPT_NETRC, CURL_NETRC_OPTIONAL);
 463#endif
 464
 465        alt = xmalloc(sizeof(*alt));
 466        alt->base = url;
 467        alt->got_indices = 0;
 468        alt->packs = NULL;
 469        alt->next = NULL;
 470        initial_base = url;
 471
 472        if (pull(commit_id))
 473                return 1;
 474
 475        curl_slist_free_all(no_pragma_header);
 476        curl_global_cleanup();
 477        return 0;
 478}