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
  16 static CURL *curl;
  17
  18 static char *base;
  19
  20 static SHA_CTX c;
  21 static z_stream stream;
  22
  23 static int local;
  24 static int zret;
  25
  26 static int curl_ssl_verify;
  27
  28 struct buffer
  29 {
  30         size_t posn;
  31         size_t size;
  32         void *buffer;
  33 };
  34
  35 static size_t fwrite_buffer(void *ptr, size_t eltsize, size_t nmemb,
  36                             struct buffer *buffer) {
  37         size_t size = eltsize * nmemb;
  38         if (size > buffer->size - buffer->posn)
  39                 size = buffer->size - buffer->posn;
  40         memcpy(buffer->buffer + buffer->posn, ptr, size);
  41         buffer->posn += size;
  42         return size;
  43 }
  44
  45 static size_t fwrite_sha1_file(void *ptr, size_t eltsize, size_t nmemb,
  46                                void *data) {
  47         unsigned char expn[4096];
  48         size_t size = eltsize * nmemb;
  49         int posn = 0;
  50         do {
  51                 ssize_t retval = write(local, ptr + posn, size - posn);
  52                 if (retval < 0)
  53                         return posn;
  54                 posn += retval;
  55         } while (posn < size);
  56
  57         stream.avail_in = size;
  58         stream.next_in = ptr;
  59         do {
  60                 stream.next_out = expn;
  61                 stream.avail_out = sizeof(expn);
  62                 zret = inflate(&stream, Z_SYNC_FLUSH);
  63                 SHA1_Update(&c, expn, sizeof(expn) - stream.avail_out);
  64         } while (stream.avail_in && zret == Z_OK);
  65         return size;
  66 }
  67
  68 int fetch(unsigned char *sha1)
  69 {
  70         char *hex = sha1_to_hex(sha1);
  71         char *filename = sha1_file_name(sha1);
  72         unsigned char real_sha1[20];
  73         char *url;
  74         char *posn;
  75
  76         local = open(filename, O_WRONLY | O_CREAT | O_EXCL, 0666);
  77
  78         if (local < 0)
  79                 return error("Couldn't open %s\n", filename);
  80
  81         memset(&stream, 0, sizeof(stream));
  82
  83         inflateInit(&stream);
  84
  85         SHA1_Init(&c);
  86
  87         curl_easy_setopt(curl, CURLOPT_FILE, NULL);
  88         curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, fwrite_sha1_file);
  89
  90         url = xmalloc(strlen(base) + 50);
  91         strcpy(url, base);
  92         posn = url + strlen(base);
  93         strcpy(posn, "objects/");
  94         posn += 8;
  95         memcpy(posn, hex, 2);
  96         posn += 2;
  97         *(posn++) = '/';
  98         strcpy(posn, hex + 2);
  99
 100         curl_easy_setopt(curl, CURLOPT_URL, url);
 101
 102         if (curl_easy_perform(curl))
 103                 return error("Couldn't get %s for %s\n", url, hex);
 104
 105         close(local);
 106         inflateEnd(&stream);
 107         SHA1_Final(real_sha1, &c);
 108         if (zret != Z_STREAM_END) {
 109                 unlink(filename);
 110                 return error("File %s (%s) corrupt\n", hex, url);
 111         }
 112         if (memcmp(sha1, real_sha1, 20)) {
 113                 unlink(filename);
 114                 return error("File %s has bad hash\n", hex);
 115         }
 116
 117         pull_say("got %s\n", hex);
 118         return 0;
 119 }
 120
 121 int fetch_ref(char *ref, unsigned char *sha1)
 122 {
 123         char *url, *posn;
 124         char hex[42];
 125         struct buffer buffer;
 126         buffer.size = 41;
 127         buffer.posn = 0;
 128         buffer.buffer = hex;
 129         hex[41] = '\0';
 130
 131         curl_easy_setopt(curl, CURLOPT_FILE, &buffer);
 132         curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
 133
 134         url = xmalloc(strlen(base) + 6 + strlen(ref));
 135         strcpy(url, base);
 136         posn = url + strlen(base);
 137         strcpy(posn, "refs/");
 138         posn += 5;
 139         strcpy(posn, ref);
 140
 141         curl_easy_setopt(curl, CURLOPT_URL, url);
 142
 143         if (curl_easy_perform(curl))
 144                 return error("Couldn't get %s for %s\n", url, ref);
 145
 146         hex[40] = '\0';
 147         get_sha1_hex(hex, sha1);
 148         return 0;
 149 }
 150
 151 int main(int argc, char **argv)
 152 {
 153         char *commit_id;
 154         char *url;
 155         int arg = 1;
 156
 157         while (arg < argc && argv[arg][0] == '-') {
 158                 if (argv[arg][1] == 't') {
 159                         get_tree = 1;
 160                 } else if (argv[arg][1] == 'c') {
 161                         get_history = 1;
 162                 } else if (argv[arg][1] == 'a') {
 163                         get_all = 1;
 164                         get_tree = 1;
 165                         get_history = 1;
 166                 } else if (argv[arg][1] == 'v') {
 167                         get_verbosely = 1;
 168                 } else if (argv[arg][1] == 'w') {
 169                         write_ref = argv[arg + 1];
 170                         arg++;
 171                 }
 172                 arg++;
 173         }
 174         if (argc < arg + 2) {
 175                 usage("git-http-pull [-c] [-t] [-a] [-d] [-v] [--recover] [-w ref] commit-id url");
 176                 return 1;
 177         }
 178         commit_id = argv[arg];
 179         url = argv[arg + 1];
 180
 181         curl_global_init(CURL_GLOBAL_ALL);
 182
 183         curl = curl_easy_init();
 184
 185         curl_ssl_verify = gitenv("GIT_SSL_NO_VERIFY") ? 0 : 1;
 186         curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, curl_ssl_verify);
 187 #if LIBCURL_VERSION_NUM >= 0x070907
 188         curl_easy_setopt(curl, CURLOPT_NETRC, CURL_NETRC_OPTIONAL);
 189 #endif
 190
 191         base = url;
 192
 193         if (pull(commit_id))
 194                 return 1;
 195
 196         curl_global_cleanup();
 197         return 0;
 198 }