Andrew's git - gitweb.git/blob

   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
  16static CURL *curl;
  17
  18static char *base;
  19
  20static SHA_CTX c;
  21static z_stream stream;
  22
  23static int local;
  24static int zret;
  25
  26static int curl_ssl_verify;
  27
  28struct buffer
  29{
  30        size_t posn;
  31        size_t size;
  32        void *buffer;
  33};
  34
  35static 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
  46static 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
  70static int got_indices = 0;
  71
  72static struct packed_git *packs = NULL;
  73
  74static 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
 111static 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
 126static 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
 179static 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
 232int 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
 290int 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
 320int 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}