protocol.c

   1 #include "cache.h"
   2 #include "config.h"
   3 #include "protocol.h"
   4
   5 static enum protocol_version parse_protocol_version(const char *value)
   6 {
   7         if (!strcmp(value, "0"))
   8                 return protocol_v0;
   9         else if (!strcmp(value, "1"))
  10                 return protocol_v1;
  11         else if (!strcmp(value, "2"))
  12                 return protocol_v2;
  13         else
  14                 return protocol_unknown_version;
  15 }
  16
  17 enum protocol_version get_protocol_version_config(void)
  18 {
  19         const char *value;
  20         enum protocol_version retval = protocol_v0;
  21         const char *git_test_k = "GIT_TEST_PROTOCOL_VERSION";
  22         const char *git_test_v = getenv(git_test_k);
  23
  24         if (!git_config_get_string_const("protocol.version", &value)) {
  25                 enum protocol_version version = parse_protocol_version(value);
  26
  27                 if (version == protocol_unknown_version)
  28                         die("unknown value for config 'protocol.version': %s",
  29                             value);
  30
  31                 retval = version;
  32         }
  33
  34         if (git_test_v && *git_test_v) {
  35                 enum protocol_version env = parse_protocol_version(git_test_v);
  36
  37                 if (env == protocol_unknown_version)
  38                         die("unknown value for %s: %s", git_test_k, git_test_v);
  39                 if (retval < env)
  40                         retval = env;
  41         }
  42
  43         return retval;
  44 }
  45
  46 enum protocol_version determine_protocol_version_server(void)
  47 {
  48         const char *git_protocol = getenv(GIT_PROTOCOL_ENVIRONMENT);
  49         enum protocol_version version = protocol_v0;
  50
  51         /*
  52          * Determine which protocol version the client has requested.  Since
  53          * multiple 'version' keys can be sent by the client, indicating that
  54          * the client is okay to speak any of them, select the greatest version
  55          * that the client has requested.  This is due to the assumption that
  56          * the most recent protocol version will be the most state-of-the-art.
  57          */
  58         if (git_protocol) {
  59                 struct string_list list = STRING_LIST_INIT_DUP;
  60                 const struct string_list_item *item;
  61                 string_list_split(&list, git_protocol, ':', -1);
  62
  63                 for_each_string_list_item(item, &list) {
  64                         const char *value;
  65                         enum protocol_version v;
  66
  67                         if (skip_prefix(item->string, "version=", &value)) {
  68                                 v = parse_protocol_version(value);
  69                                 if (v > version)
  70                                         version = v;
  71                         }
  72                 }
  73
  74                 string_list_clear(&list, 0);
  75         }
  76
  77         return version;
  78 }
  79
  80 enum protocol_version determine_protocol_version_client(const char *server_response)
  81 {
  82         enum protocol_version version = protocol_v0;
  83
  84         if (skip_prefix(server_response, "version ", &server_response)) {
  85                 version = parse_protocol_version(server_response);
  86
  87                 if (version == protocol_unknown_version)
  88                         die("server is speaking an unknown protocol");
  89                 if (version == protocol_v0)
  90                         die("protocol error: server explicitly said version 0");
  91         }
  92
  93         return version;
  94 }