diff options
Diffstat (limited to 'third_party/git/protocol.c')
-rw-r--r-- | third_party/git/protocol.c | 93 |
1 files changed, 93 insertions, 0 deletions
diff --git a/third_party/git/protocol.c b/third_party/git/protocol.c new file mode 100644 index 000000000000..803bef5c87e0 --- /dev/null +++ b/third_party/git/protocol.c @@ -0,0 +1,93 @@ +#include "cache.h" +#include "config.h" +#include "protocol.h" + +static enum protocol_version parse_protocol_version(const char *value) +{ + if (!strcmp(value, "0")) + return protocol_v0; + else if (!strcmp(value, "1")) + return protocol_v1; + else if (!strcmp(value, "2")) + return protocol_v2; + else + return protocol_unknown_version; +} + +enum protocol_version get_protocol_version_config(void) +{ + const char *value; + const char *git_test_k = "GIT_TEST_PROTOCOL_VERSION"; + const char *git_test_v; + + if (!git_config_get_string_const("protocol.version", &value)) { + enum protocol_version version = parse_protocol_version(value); + + if (version == protocol_unknown_version) + die("unknown value for config 'protocol.version': %s", + value); + + return version; + } + + git_test_v = getenv(git_test_k); + if (git_test_v && *git_test_v) { + enum protocol_version env = parse_protocol_version(git_test_v); + + if (env == protocol_unknown_version) + die("unknown value for %s: %s", git_test_k, git_test_v); + return env; + } + + return protocol_v2; +} + +enum protocol_version determine_protocol_version_server(void) +{ + const char *git_protocol = getenv(GIT_PROTOCOL_ENVIRONMENT); + enum protocol_version version = protocol_v0; + + /* + * Determine which protocol version the client has requested. Since + * multiple 'version' keys can be sent by the client, indicating that + * the client is okay to speak any of them, select the greatest version + * that the client has requested. This is due to the assumption that + * the most recent protocol version will be the most state-of-the-art. + */ + if (git_protocol) { + struct string_list list = STRING_LIST_INIT_DUP; + const struct string_list_item *item; + string_list_split(&list, git_protocol, ':', -1); + + for_each_string_list_item(item, &list) { + const char *value; + enum protocol_version v; + + if (skip_prefix(item->string, "version=", &value)) { + v = parse_protocol_version(value); + if (v > version) + version = v; + } + } + + string_list_clear(&list, 0); + } + + return version; +} + +enum protocol_version determine_protocol_version_client(const char *server_response) +{ + enum protocol_version version = protocol_v0; + + if (skip_prefix(server_response, "version ", &server_response)) { + version = parse_protocol_version(server_response); + + if (version == protocol_unknown_version) + die("server is speaking an unknown protocol"); + if (version == protocol_v0) + die("protocol error: server explicitly said version 0"); + } + + return version; +} |