transport: store protocol version
[git/git.git] / protocol.c
CommitLineData
373d70ef
BW
1#include "cache.h"
2#include "config.h"
3#include "protocol.h"
4
5static 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
12 return protocol_unknown_version;
13}
14
15enum protocol_version get_protocol_version_config(void)
16{
17 const char *value;
18 if (!git_config_get_string_const("protocol.version", &value)) {
19 enum protocol_version version = parse_protocol_version(value);
20
21 if (version == protocol_unknown_version)
22 die("unknown value for config 'protocol.version': %s",
23 value);
24
25 return version;
26 }
27
28 return protocol_v0;
29}
30
31enum protocol_version determine_protocol_version_server(void)
32{
33 const char *git_protocol = getenv(GIT_PROTOCOL_ENVIRONMENT);
34 enum protocol_version version = protocol_v0;
35
36 /*
37 * Determine which protocol version the client has requested. Since
38 * multiple 'version' keys can be sent by the client, indicating that
39 * the client is okay to speak any of them, select the greatest version
40 * that the client has requested. This is due to the assumption that
41 * the most recent protocol version will be the most state-of-the-art.
42 */
43 if (git_protocol) {
44 struct string_list list = STRING_LIST_INIT_DUP;
45 const struct string_list_item *item;
46 string_list_split(&list, git_protocol, ':', -1);
47
48 for_each_string_list_item(item, &list) {
49 const char *value;
50 enum protocol_version v;
51
52 if (skip_prefix(item->string, "version=", &value)) {
53 v = parse_protocol_version(value);
54 if (v > version)
55 version = v;
56 }
57 }
58
59 string_list_clear(&list, 0);
60 }
61
62 return version;
63}
64
65enum protocol_version determine_protocol_version_client(const char *server_response)
66{
67 enum protocol_version version = protocol_v0;
68
69 if (skip_prefix(server_response, "version ", &server_response)) {
70 version = parse_protocol_version(server_response);
71
72 if (version == protocol_unknown_version)
73 die("server is speaking an unknown protocol");
74 if (version == protocol_v0)
75 die("protocol error: server explicitly said version 0");
76 }
77
78 return version;
79}