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 size_t fwrite_sha1_file(void *ptr, size_t eltsize, size_t nmemb,
  20                                void *data) {
  21         unsigned char expn[4096];
  22         size_t size = eltsize * nmemb;
  23         int posn = 0;
  24         do {
  25                 ssize_t retval = write(local, ptr + posn, size - posn);
  26                 if (retval < 0)
  27                         return posn;
  28                 posn += retval;
  29         } while (posn < size);
  30
  31         stream.avail_in = size;
  32         stream.next_in = ptr;
  33         do {
  34                 stream.next_out = expn;
  35                 stream.avail_out = sizeof(expn);
  36                 zret = inflate(&stream, Z_SYNC_FLUSH);
  37                 SHA1_Update(&c, expn, sizeof(expn) - stream.avail_out);
  38         } while (stream.avail_in && zret == Z_OK);
  39         return size;
  40 }
  41
  42 int fetch(unsigned char *sha1)
  43 {
  44         char *hex = sha1_to_hex(sha1);
  45         char *filename = sha1_file_name(sha1);
  46         unsigned char real_sha1[20];
  47         char *url;
  48         char *posn;
  49
  50         local = open(filename, O_WRONLY | O_CREAT | O_EXCL, 0666);
  51
  52         if (local < 0)
  53                 return error("Couldn't open %s\n", filename);
  54
  55         memset(&stream, 0, sizeof(stream));
  56
  57         inflateInit(&stream);
  58
  59         SHA1_Init(&c);
  60
  61         curl_easy_setopt(curl, CURLOPT_FILE, NULL);
  62         curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, fwrite_sha1_file);
  63
  64         url = xmalloc(strlen(base) + 50);
  65         strcpy(url, base);
  66         posn = url + strlen(base);
  67         strcpy(posn, "objects/");
  68         posn += 8;
  69         memcpy(posn, hex, 2);
  70         posn += 2;
  71         *(posn++) = '/';
  72         strcpy(posn, hex + 2);
  73
  74         curl_easy_setopt(curl, CURLOPT_URL, url);
  75
  76         if (curl_easy_perform(curl))
  77                 return error("Couldn't get %s for %s\n", url, hex);
  78
  79         close(local);
  80         inflateEnd(&stream);
  81         SHA1_Final(real_sha1, &c);
  82         if (zret != Z_STREAM_END) {
  83                 unlink(filename);
  84                 return error("File %s (%s) corrupt\n", hex, url);
  85         }
  86         if (memcmp(sha1, real_sha1, 20)) {
  87                 unlink(filename);
  88                 return error("File %s has bad hash\n", hex);
  89         }
  90
  91         pull_say("got %s\n", hex);
  92         return 0;
  93 }
  94
  95 int main(int argc, char **argv)
  96 {
  97         char *commit_id;
  98         char *url;
  99         int arg = 1;
 100
 101         while (arg < argc && argv[arg][0] == '-') {
 102                 if (argv[arg][1] == 't') {
 103                         get_tree = 1;
 104                 } else if (argv[arg][1] == 'c') {
 105                         get_history = 1;
 106                 } else if (argv[arg][1] == 'a') {
 107                         get_all = 1;
 108                         get_tree = 1;
 109                         get_history = 1;
 110                 } else if (argv[arg][1] == 'v') {
 111                         get_verbosely = 1;
 112                 }
 113                 arg++;
 114         }
 115         if (argc < arg + 2) {
 116                 usage("git-http-pull [-c] [-t] [-a] [-v] commit-id url");
 117                 return 1;
 118         }
 119         commit_id = argv[arg];
 120         url = argv[arg + 1];
 121
 122         curl_global_init(CURL_GLOBAL_ALL);
 123
 124         curl = curl_easy_init();
 125
 126         base = url;
 127
 128         if (pull(commit_id))
 129                 return 1;
 130
 131         curl_global_cleanup();
 132         return 0;
 133 }