Fifth batch for 2.21
[git/git.git] / protocol.c
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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;
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11 else if (!strcmp(value, "2"))
12 return protocol_v2;
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13 else
14 return protocol_unknown_version;
15}
16
17enum protocol_version get_protocol_version_config(void)
18{
19 const char *value;
20 if (!git_config_get_string_const("protocol.version", &value)) {
21 enum protocol_version version = parse_protocol_version(value);
22
23 if (version == protocol_unknown_version)
24 die("unknown value for config 'protocol.version': %s",
25 value);
26
27 return version;
28 }
29
30 return protocol_v0;
31}
32
33enum protocol_version determine_protocol_version_server(void)
34{
35 const char *git_protocol = getenv(GIT_PROTOCOL_ENVIRONMENT);
36 enum protocol_version version = protocol_v0;
37
38 /*
39 * Determine which protocol version the client has requested. Since
40 * multiple 'version' keys can be sent by the client, indicating that
41 * the client is okay to speak any of them, select the greatest version
42 * that the client has requested. This is due to the assumption that
43 * the most recent protocol version will be the most state-of-the-art.
44 */
45 if (git_protocol) {
46 struct string_list list = STRING_LIST_INIT_DUP;
47 const struct string_list_item *item;
48 string_list_split(&list, git_protocol, ':', -1);
49
50 for_each_string_list_item(item, &list) {
51 const char *value;
52 enum protocol_version v;
53
54 if (skip_prefix(item->string, "version=", &value)) {
55 v = parse_protocol_version(value);
56 if (v > version)
57 version = v;
58 }
59 }
60
61 string_list_clear(&list, 0);
62 }
63
64 return version;
65}
66
67enum protocol_version determine_protocol_version_client(const char *server_response)
68{
69 enum protocol_version version = protocol_v0;
70
71 if (skip_prefix(server_response, "version ", &server_response)) {
72 version = parse_protocol_version(server_response);
73
74 if (version == protocol_unknown_version)
75 die("server is speaking an unknown protocol");
76 if (version == protocol_v0)
77 die("protocol error: server explicitly said version 0");
78 }
79
80 return version;
81}