http-pull.c

   1 #include <fcntl.h>
   2 #include <unistd.h>
   3 #include <string.h>
   4 #include <stdlib.h>
   5 #include "cache.h"
   6 #include "commit.h"
   7 #include <errno.h>
   8 #include <stdio.h>
   9
  10 #include "pull.h"
  11
  12 #include <curl/curl.h>
  13 #include <curl/easy.h>
  14
  15 static CURL *curl;
  16
  17 static char *base;
  18
  19 static SHA_CTX c;
  20 static z_stream stream;
  21
  22 static int local;
  23 static int zret;
  24
  25 static size_t fwrite_sha1_file(void *ptr, size_t eltsize, size_t nmemb,
  26                                void *data) {
  27         char expn[4096];
  28         size_t size = eltsize * nmemb;
  29         int posn = 0;
  30         do {
  31                 ssize_t retval = write(local, ptr + posn, size - posn);
  32                 if (retval < 0)
  33                         return posn;
  34                 posn += retval;
  35         } while (posn < size);
  36
  37         stream.avail_in = size;
  38         stream.next_in = ptr;
  39         do {
  40                 stream.next_out = expn;
  41                 stream.avail_out = sizeof(expn);
  42                 zret = inflate(&stream, Z_SYNC_FLUSH);
  43                 SHA1_Update(&c, expn, sizeof(expn) - stream.avail_out);
  44         } while (stream.avail_in && zret == Z_OK);
  45         return size;
  46 }
  47
  48 int fetch(unsigned char *sha1)
  49 {
  50         char *hex = sha1_to_hex(sha1);
  51         char *filename = sha1_file_name(sha1);
  52         char real_sha1[20];
  53         char *url;
  54         char *posn;
  55
  56         local = open(filename, O_WRONLY | O_CREAT | O_EXCL, 0666);
  57
  58         if (local < 0)
  59                 return error("Couldn't open %s\n", filename);
  60
  61         memset(&stream, 0, sizeof(stream));
  62
  63         inflateInit(&stream);
  64
  65         SHA1_Init(&c);
  66
  67         curl_easy_setopt(curl, CURLOPT_FILE, NULL);
  68         curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, fwrite_sha1_file);
  69
  70         url = xmalloc(strlen(base) + 50);
  71         strcpy(url, base);
  72         posn = url + strlen(base);
  73         strcpy(posn, "objects/");
  74         posn += 8;
  75         memcpy(posn, hex, 2);
  76         posn += 2;
  77         *(posn++) = '/';
  78         strcpy(posn, hex + 2);
  79
  80         curl_easy_setopt(curl, CURLOPT_URL, url);
  81
  82         /*printf("Getting %s\n", hex);*/
  83
  84         if (curl_easy_perform(curl))
  85                 return error("Couldn't get %s for %s\n", url, hex);
  86
  87         close(local);
  88         inflateEnd(&stream);
  89         SHA1_Final(real_sha1, &c);
  90         if (zret != Z_STREAM_END) {
  91                 unlink(filename);
  92                 return error("File %s (%s) corrupt\n", hex, url);
  93         }
  94         if (memcmp(sha1, real_sha1, 20)) {
  95                 unlink(filename);
  96                 return error("File %s has bad hash\n", hex);
  97         }
  98
  99         return 0;
 100 }
 101
 102 int main(int argc, char **argv)
 103 {
 104         char *commit_id;
 105         char *url;
 106         int arg = 1;
 107
 108         while (arg < argc && argv[arg][0] == '-') {
 109                 if (argv[arg][1] == 't') {
 110                         get_tree = 1;
 111                 } else if (argv[arg][1] == 'c') {
 112                         get_history = 1;
 113                 } else if (argv[arg][1] == 'a') {
 114                         get_all = 1;
 115                         get_tree = 1;
 116                         get_history = 1;
 117                 }
 118                 arg++;
 119         }
 120         if (argc < arg + 2) {
 121                 usage("http-pull [-c] [-t] [-a] commit-id url");
 122                 return 1;
 123         }
 124         commit_id = argv[arg];
 125         url = argv[arg + 1];
 126
 127         curl_global_init(CURL_GLOBAL_ALL);
 128
 129         curl = curl_easy_init();
 130
 131         base = url;
 132
 133         if (pull(commit_id))
 134                 return 1;
 135
 136         curl_global_cleanup();
 137         return 0;
 138 }