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 #if LIBCURL_VERSION_NUM < 0x070907
  16 #define curl_easy_setopt(a, b, c) do { /* nothing */ } while(0)
  17 #endif
  18
  19 static CURL *curl;
  20
  21 static char *base;
  22
  23 static SHA_CTX c;
  24 static z_stream stream;
  25
  26 static int local;
  27 static int zret;
  28
  29 static int curl_ssl_verify;
  30
  31 struct buffer
  32 {
  33         size_t posn;
  34         size_t size;
  35         void *buffer;
  36 };
  37
  38 static size_t fwrite_buffer(void *ptr, size_t eltsize, size_t nmemb,
  39                             struct buffer *buffer) {
  40         size_t size = eltsize * nmemb;
  41         if (size > buffer->size - buffer->posn)
  42                 size = buffer->size - buffer->posn;
  43         memcpy(buffer->buffer + buffer->posn, ptr, size);
  44         buffer->posn += size;
  45         return size;
  46 }
  47
  48 static size_t fwrite_sha1_file(void *ptr, size_t eltsize, size_t nmemb,
  49                                void *data) {
  50         unsigned char expn[4096];
  51         size_t size = eltsize * nmemb;
  52         int posn = 0;
  53         do {
  54                 ssize_t retval = write(local, ptr + posn, size - posn);
  55                 if (retval < 0)
  56                         return posn;
  57                 posn += retval;
  58         } while (posn < size);
  59
  60         stream.avail_in = size;
  61         stream.next_in = ptr;
  62         do {
  63                 stream.next_out = expn;
  64                 stream.avail_out = sizeof(expn);
  65                 zret = inflate(&stream, Z_SYNC_FLUSH);
  66                 SHA1_Update(&c, expn, sizeof(expn) - stream.avail_out);
  67         } while (stream.avail_in && zret == Z_OK);
  68         return size;
  69 }
  70
  71 int fetch(unsigned char *sha1)
  72 {
  73         char *hex = sha1_to_hex(sha1);
  74         char *filename = sha1_file_name(sha1);
  75         unsigned char real_sha1[20];
  76         char *url;
  77         char *posn;
  78
  79         local = open(filename, O_WRONLY | O_CREAT | O_EXCL, 0666);
  80
  81         if (local < 0)
  82                 return error("Couldn't open %s\n", filename);
  83
  84         memset(&stream, 0, sizeof(stream));
  85
  86         inflateInit(&stream);
  87
  88         SHA1_Init(&c);
  89
  90         curl_easy_setopt(curl, CURLOPT_FILE, NULL);
  91         curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, fwrite_sha1_file);
  92
  93         url = xmalloc(strlen(base) + 50);
  94         strcpy(url, base);
  95         posn = url + strlen(base);
  96         strcpy(posn, "objects/");
  97         posn += 8;
  98         memcpy(posn, hex, 2);
  99         posn += 2;
 100         *(posn++) = '/';
 101         strcpy(posn, hex + 2);
 102
 103         curl_easy_setopt(curl, CURLOPT_URL, url);
 104
 105         if (curl_easy_perform(curl))
 106                 return error("Couldn't get %s for %s\n", url, hex);
 107
 108         close(local);
 109         inflateEnd(&stream);
 110         SHA1_Final(real_sha1, &c);
 111         if (zret != Z_STREAM_END) {
 112                 unlink(filename);
 113                 return error("File %s (%s) corrupt\n", hex, url);
 114         }
 115         if (memcmp(sha1, real_sha1, 20)) {
 116                 unlink(filename);
 117                 return error("File %s has bad hash\n", hex);
 118         }
 119
 120         pull_say("got %s\n", hex);
 121         return 0;
 122 }
 123
 124 int fetch_ref(char *ref, unsigned char *sha1)
 125 {
 126         char *url, *posn;
 127         char hex[42];
 128         struct buffer buffer;
 129         buffer.size = 41;
 130         buffer.posn = 0;
 131         buffer.buffer = hex;
 132         hex[41] = '\0';
 133
 134         curl_easy_setopt(curl, CURLOPT_FILE, &buffer);
 135         curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
 136
 137         url = xmalloc(strlen(base) + 6 + strlen(ref));
 138         strcpy(url, base);
 139         posn = url + strlen(base);
 140         strcpy(posn, "refs/");
 141         posn += 5;
 142         strcpy(posn, ref);
 143
 144         curl_easy_setopt(curl, CURLOPT_URL, url);
 145
 146         if (curl_easy_perform(curl))
 147                 return error("Couldn't get %s for %s\n", url, ref);
 148
 149         hex[40] = '\0';
 150         get_sha1_hex(hex, sha1);
 151         return 0;
 152 }
 153
 154 int main(int argc, char **argv)
 155 {
 156         char *commit_id;
 157         char *url;
 158         int arg = 1;
 159
 160         while (arg < argc && argv[arg][0] == '-') {
 161                 if (argv[arg][1] == 't') {
 162                         get_tree = 1;
 163                 } else if (argv[arg][1] == 'c') {
 164                         get_history = 1;
 165                 } else if (argv[arg][1] == 'a') {
 166                         get_all = 1;
 167                         get_tree = 1;
 168                         get_history = 1;
 169                 } else if (argv[arg][1] == 'v') {
 170                         get_verbosely = 1;
 171                 } else if (argv[arg][1] == 'w') {
 172                         write_ref = argv[arg + 1];
 173                         arg++;
 174                 }
 175                 arg++;
 176         }
 177         if (argc < arg + 2) {
 178                 usage("git-http-pull [-c] [-t] [-a] [-d] [-v] [--recover] [-w ref] commit-id url");
 179                 return 1;
 180         }
 181         commit_id = argv[arg];
 182         url = argv[arg + 1];
 183
 184         curl_global_init(CURL_GLOBAL_ALL);
 185
 186         curl = curl_easy_init();
 187
 188         curl_ssl_verify = gitenv("GIT_SSL_NO_VERIFY") ? 0 : 1;
 189         curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, curl_ssl_verify);
 190         curl_easy_setopt(curl, CURLOPT_NETRC, CURL_NETRC_OPTIONAL);
 191
 192         base = url;
 193
 194         if (pull(commit_id))
 195                 return 1;
 196
 197         curl_global_cleanup();
 198         return 0;
 199 }