Andrew's git / gitweb.git / http-pull.c
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http-pull.con commit Try to find the optimum merge base while resolving. (9585e40)
   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
  70void prefetch(unsigned char *sha1)
  71{
  72}
  73
  74static int got_indices = 0;
  75
  76static struct packed_git *packs = NULL;
  77
  78static 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
 115static 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
 130static 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
 183static 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
 236int 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
 294int 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
 324int 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-pull [-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}