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         int val;
  21         const char *git_test_k = "GIT_TEST_PROTOCOL_VERSION";
  22         const char *git_test_v;
  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                 return version;
  32         }
  33
  34         if (!git_config_get_bool("feature.experimental", &val) && val)
  35                 return protocol_v2;
  36
  37         git_test_v = getenv(git_test_k);
  38         if (git_test_v && *git_test_v) {
  39                 enum protocol_version env = parse_protocol_version(git_test_v);
  40
  41                 if (env == protocol_unknown_version)
  42                         die("unknown value for %s: %s", git_test_k, git_test_v);
  43                 return env;
  44         }
  45
  46         return protocol_v0;
  47 }
  48
  49 enum protocol_version determine_protocol_version_server(void)
  50 {
  51         const char *git_protocol = getenv(GIT_PROTOCOL_ENVIRONMENT);
  52         enum protocol_version version = protocol_v0;
  53
  54         /*
  55          * Determine which protocol version the client has requested.  Since
  56          * multiple 'version' keys can be sent by the client, indicating that
  57          * the client is okay to speak any of them, select the greatest version
  58          * that the client has requested.  This is due to the assumption that
  59          * the most recent protocol version will be the most state-of-the-art.
  60          */
  61         if (git_protocol) {
  62                 struct string_list list = STRING_LIST_INIT_DUP;
  63                 const struct string_list_item *item;
  64                 string_list_split(&list, git_protocol, ':', -1);
  65
  66                 for_each_string_list_item(item, &list) {
  67                         const char *value;
  68                         enum protocol_version v;
  69
  70                         if (skip_prefix(item->string, "version=", &value)) {
  71                                 v = parse_protocol_version(value);
  72                                 if (v > version)
  73                                         version = v;
  74                         }
  75                 }
  76
  77                 string_list_clear(&list, 0);
  78         }
  79
  80         return version;
  81 }
  82
  83 enum protocol_version determine_protocol_version_client(const char *server_response)
  84 {
  85         enum protocol_version version = protocol_v0;
  86
  87         if (skip_prefix(server_response, "version ", &server_response)) {
  88                 version = parse_protocol_version(server_response);
  89
  90                 if (version == protocol_unknown_version)
  91                         die("server is speaking an unknown protocol");
  92                 if (version == protocol_v0)
  93                         die("protocol error: server explicitly said version 0");
  94         }
  95
  96         return version;
  97 }