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
   9static CURL *curl;
  10
  11static char *base;
  12
  13static SHA_CTX c;
  14static z_stream stream;
  15
  16static int local;
  17static int zret;
  18
  19struct buffer
  20{
  21        size_t posn;
  22        size_t size;
  23        void *buffer;
  24};
  25
  26static size_t fwrite_buffer(void *ptr, size_t eltsize, size_t nmemb,
  27                            struct buffer *buffer) {
  28        size_t size = eltsize * nmemb;
  29        if (size > buffer->size - buffer->posn)
  30                size = buffer->size - buffer->posn;
  31        memcpy(buffer->buffer + buffer->posn, ptr, size);
  32        buffer->posn += size;
  33        return size;
  34}
  35
  36static size_t fwrite_sha1_file(void *ptr, size_t eltsize, size_t nmemb, 
  37                               void *data) {
  38        unsigned char expn[4096];
  39        size_t size = eltsize * nmemb;
  40        int posn = 0;
  41        do {
  42                ssize_t retval = write(local, ptr + posn, size - posn);
  43                if (retval < 0)
  44                        return posn;
  45                posn += retval;
  46        } while (posn < size);
  47
  48        stream.avail_in = size;
  49        stream.next_in = ptr;
  50        do {
  51                stream.next_out = expn;
  52                stream.avail_out = sizeof(expn);
  53                zret = inflate(&stream, Z_SYNC_FLUSH);
  54                SHA1_Update(&c, expn, sizeof(expn) - stream.avail_out);
  55        } while (stream.avail_in && zret == Z_OK);
  56        return size;
  57}
  58
  59int fetch(unsigned char *sha1)
  60{
  61        char *hex = sha1_to_hex(sha1);
  62        char *filename = sha1_file_name(sha1);
  63        unsigned char real_sha1[20];
  64        char *url;
  65        char *posn;
  66
  67        local = open(filename, O_WRONLY | O_CREAT | O_EXCL, 0666);
  68
  69        if (local < 0)
  70                return error("Couldn't open %s\n", filename);
  71
  72        memset(&stream, 0, sizeof(stream));
  73
  74        inflateInit(&stream);
  75
  76        SHA1_Init(&c);
  77
  78        curl_easy_setopt(curl, CURLOPT_FILE, NULL);
  79        curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, fwrite_sha1_file);
  80
  81        url = xmalloc(strlen(base) + 50);
  82        strcpy(url, base);
  83        posn = url + strlen(base);
  84        strcpy(posn, "objects/");
  85        posn += 8;
  86        memcpy(posn, hex, 2);
  87        posn += 2;
  88        *(posn++) = '/';
  89        strcpy(posn, hex + 2);
  90
  91        curl_easy_setopt(curl, CURLOPT_URL, url);
  92
  93        if (curl_easy_perform(curl))
  94                return error("Couldn't get %s for %s\n", url, hex);
  95
  96        close(local);
  97        inflateEnd(&stream);
  98        SHA1_Final(real_sha1, &c);
  99        if (zret != Z_STREAM_END) {
 100                unlink(filename);
 101                return error("File %s (%s) corrupt\n", hex, url);
 102        }
 103        if (memcmp(sha1, real_sha1, 20)) {
 104                unlink(filename);
 105                return error("File %s has bad hash\n", hex);
 106        }
 107        
 108        pull_say("got %s\n", hex);
 109        return 0;
 110}
 111
 112int fetch_ref(char *ref, unsigned char *sha1)
 113{
 114        char *url, *posn;
 115        char hex[42];
 116        struct buffer buffer;
 117        buffer.size = 41;
 118        buffer.posn = 0;
 119        buffer.buffer = hex;
 120        hex[41] = '\0';
 121        
 122        curl_easy_setopt(curl, CURLOPT_FILE, &buffer);
 123        curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
 124
 125        url = xmalloc(strlen(base) + 6 + strlen(ref));
 126        strcpy(url, base);
 127        posn = url + strlen(base);
 128        strcpy(posn, "refs/");
 129        posn += 5;
 130        strcpy(posn, ref);
 131
 132        curl_easy_setopt(curl, CURLOPT_URL, url);
 133
 134        if (curl_easy_perform(curl))
 135                return error("Couldn't get %s for %s\n", url, ref);
 136
 137        hex[40] = '\0';
 138        get_sha1_hex(hex, sha1);
 139        return 0;
 140}
 141
 142int main(int argc, char **argv)
 143{
 144        char *commit_id;
 145        char *url;
 146        int arg = 1;
 147
 148        while (arg < argc && argv[arg][0] == '-') {
 149                if (argv[arg][1] == 't') {
 150                        get_tree = 1;
 151                } else if (argv[arg][1] == 'c') {
 152                        get_history = 1;
 153                } else if (argv[arg][1] == 'a') {
 154                        get_all = 1;
 155                        get_tree = 1;
 156                        get_history = 1;
 157                } else if (argv[arg][1] == 'v') {
 158                        get_verbosely = 1;
 159                } else if (argv[arg][1] == 'w') {
 160                        write_ref = argv[arg + 1];
 161                        arg++;
 162                }
 163                arg++;
 164        }
 165        if (argc < arg + 2) {
 166                usage("git-http-pull [-c] [-t] [-a] [-d] [-v] [--recover] [-w ref] commit-id url");
 167                return 1;
 168        }
 169        commit_id = argv[arg];
 170        url = argv[arg + 1];
 171
 172        curl_global_init(CURL_GLOBAL_ALL);
 173
 174        curl = curl_easy_init();
 175
 176        base = url;
 177
 178        if (pull(commit_id))
 179                return 1;
 180
 181        curl_global_cleanup();
 182        return 0;
 183}