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 struct buffer
  20 {
  21         size_t posn;
  22         size_t size;
  23         void *buffer;
  24 };
  25
  26 static 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
  36 static 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
  59 int 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
 112 int 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
 142 int 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 }