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 static CURL *curl;
  10
  11 static char *base;
  12
  13 static SHA_CTX c;
  14 static z_stream stream;
  15
  16 static int local;
  17 static int zret;
  18
  19 static int curl_ssl_verify;
  20
  21 struct buffer
  22 {
  23         size_t posn;
  24         size_t size;
  25         void *buffer;
  26 };
  27
  28 static size_t fwrite_buffer(void *ptr, size_t eltsize, size_t nmemb,
  29                             struct buffer *buffer) {
  30         size_t size = eltsize * nmemb;
  31         if (size > buffer->size - buffer->posn)
  32                 size = buffer->size - buffer->posn;
  33         memcpy(buffer->buffer + buffer->posn, ptr, size);
  34         buffer->posn += size;
  35         return size;
  36 }
  37
  38 static size_t fwrite_sha1_file(void *ptr, size_t eltsize, size_t nmemb,
  39                                void *data) {
  40         unsigned char expn[4096];
  41         size_t size = eltsize * nmemb;
  42         int posn = 0;
  43         do {
  44                 ssize_t retval = write(local, ptr + posn, size - posn);
  45                 if (retval < 0)
  46                         return posn;
  47                 posn += retval;
  48         } while (posn < size);
  49
  50         stream.avail_in = size;
  51         stream.next_in = ptr;
  52         do {
  53                 stream.next_out = expn;
  54                 stream.avail_out = sizeof(expn);
  55                 zret = inflate(&stream, Z_SYNC_FLUSH);
  56                 SHA1_Update(&c, expn, sizeof(expn) - stream.avail_out);
  57         } while (stream.avail_in && zret == Z_OK);
  58         return size;
  59 }
  60
  61 int fetch(unsigned char *sha1)
  62 {
  63         char *hex = sha1_to_hex(sha1);
  64         char *filename = sha1_file_name(sha1);
  65         unsigned char real_sha1[20];
  66         char *url;
  67         char *posn;
  68
  69         local = open(filename, O_WRONLY | O_CREAT | O_EXCL, 0666);
  70
  71         if (local < 0)
  72                 return error("Couldn't open %s\n", filename);
  73
  74         memset(&stream, 0, sizeof(stream));
  75
  76         inflateInit(&stream);
  77
  78         SHA1_Init(&c);
  79
  80         curl_easy_setopt(curl, CURLOPT_FILE, NULL);
  81         curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, fwrite_sha1_file);
  82
  83         url = xmalloc(strlen(base) + 50);
  84         strcpy(url, base);
  85         posn = url + strlen(base);
  86         strcpy(posn, "objects/");
  87         posn += 8;
  88         memcpy(posn, hex, 2);
  89         posn += 2;
  90         *(posn++) = '/';
  91         strcpy(posn, hex + 2);
  92
  93         curl_easy_setopt(curl, CURLOPT_URL, url);
  94
  95         if (curl_easy_perform(curl))
  96                 return error("Couldn't get %s for %s\n", url, hex);
  97
  98         close(local);
  99         inflateEnd(&stream);
 100         SHA1_Final(real_sha1, &c);
 101         if (zret != Z_STREAM_END) {
 102                 unlink(filename);
 103                 return error("File %s (%s) corrupt\n", hex, url);
 104         }
 105         if (memcmp(sha1, real_sha1, 20)) {
 106                 unlink(filename);
 107                 return error("File %s has bad hash\n", hex);
 108         }
 109
 110         pull_say("got %s\n", hex);
 111         return 0;
 112 }
 113
 114 int fetch_ref(char *ref, unsigned char *sha1)
 115 {
 116         char *url, *posn;
 117         char hex[42];
 118         struct buffer buffer;
 119         buffer.size = 41;
 120         buffer.posn = 0;
 121         buffer.buffer = hex;
 122         hex[41] = '\0';
 123
 124         curl_easy_setopt(curl, CURLOPT_FILE, &buffer);
 125         curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
 126
 127         url = xmalloc(strlen(base) + 6 + strlen(ref));
 128         strcpy(url, base);
 129         posn = url + strlen(base);
 130         strcpy(posn, "refs/");
 131         posn += 5;
 132         strcpy(posn, ref);
 133
 134         curl_easy_setopt(curl, CURLOPT_URL, url);
 135
 136         if (curl_easy_perform(curl))
 137                 return error("Couldn't get %s for %s\n", url, ref);
 138
 139         hex[40] = '\0';
 140         get_sha1_hex(hex, sha1);
 141         return 0;
 142 }
 143
 144 int main(int argc, char **argv)
 145 {
 146         char *commit_id;
 147         char *url;
 148         int arg = 1;
 149
 150         while (arg < argc && argv[arg][0] == '-') {
 151                 if (argv[arg][1] == 't') {
 152                         get_tree = 1;
 153                 } else if (argv[arg][1] == 'c') {
 154                         get_history = 1;
 155                 } else if (argv[arg][1] == 'a') {
 156                         get_all = 1;
 157                         get_tree = 1;
 158                         get_history = 1;
 159                 } else if (argv[arg][1] == 'v') {
 160                         get_verbosely = 1;
 161                 } else if (argv[arg][1] == 'w') {
 162                         write_ref = argv[arg + 1];
 163                         arg++;
 164                 }
 165                 arg++;
 166         }
 167         if (argc < arg + 2) {
 168                 usage("git-http-pull [-c] [-t] [-a] [-d] [-v] [--recover] [-w ref] commit-id url");
 169                 return 1;
 170         }
 171         commit_id = argv[arg];
 172         url = argv[arg + 1];
 173
 174         curl_global_init(CURL_GLOBAL_ALL);
 175
 176         curl = curl_easy_init();
 177
 178         curl_ssl_verify = gitenv("GIT_SSL_NO_VERIFY") ? 0 : 1;
 179         curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, curl_ssl_verify);
 180         curl_easy_setopt(curl, CURLOPT_NETRC, CURL_NETRC_OPTIONAL);
 181
 182         base = url;
 183
 184         if (pull(commit_id))
 185                 return 1;
 186
 187         curl_global_cleanup();
 188         return 0;
 189 }