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