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f1de981e8b
There are two functions to get a single config string: - git_config_get_string() - git_config_get_string_const() One might naively think that the first one allocates a new string and the second one just points us to the internal configset storage. But in fact they both allocate a new copy; the second one exists only to avoid having to cast when using it with a const global which we never intend to free. The documentation for the function explains that clearly, but it seems I'm not alone in being surprised by this. Of 17 calls to the function, 13 of them leak the resulting value. We could obviously fix these by adding the appropriate free(). But it would be simpler still if we actually had a non-allocating way to get the string. There's git_config_get_value() but that doesn't quite do what we want. If the config key is present but is a boolean with no value (e.g., "[foo]bar" in the file), then we'll get NULL (whereas the string versions will print an error and die). So let's introduce a new variant, git_config_get_string_tmp(), that behaves as these callers expect. We need a new name because we have new semantics but the same function signature (so even if we converted the four remaining callers, topics in flight might be surprised). The "tmp" is because this value should only be held onto for a short time. In practice it's rare for us to clear and refresh the configset, invalidating the pointer, but hopefully the "tmp" makes callers think about the lifetime. In each of the converted cases here the value only needs to last within the local function or its immediate caller. Signed-off-by: Jeff King <peff@peff.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
98 lines
2.5 KiB
C
98 lines
2.5 KiB
C
#include "cache.h"
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#include "config.h"
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#include "protocol.h"
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static enum protocol_version parse_protocol_version(const char *value)
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{
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if (!strcmp(value, "0"))
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return protocol_v0;
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else if (!strcmp(value, "1"))
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return protocol_v1;
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else if (!strcmp(value, "2"))
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return protocol_v2;
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else
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return protocol_unknown_version;
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}
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enum protocol_version get_protocol_version_config(void)
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{
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const char *value;
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int val;
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const char *git_test_k = "GIT_TEST_PROTOCOL_VERSION";
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const char *git_test_v;
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if (!git_config_get_string_tmp("protocol.version", &value)) {
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enum protocol_version version = parse_protocol_version(value);
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if (version == protocol_unknown_version)
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die("unknown value for config 'protocol.version': %s",
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value);
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return version;
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}
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if (!git_config_get_bool("feature.experimental", &val) && val)
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return protocol_v2;
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git_test_v = getenv(git_test_k);
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if (git_test_v && *git_test_v) {
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enum protocol_version env = parse_protocol_version(git_test_v);
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if (env == protocol_unknown_version)
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die("unknown value for %s: %s", git_test_k, git_test_v);
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return env;
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}
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return protocol_v0;
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}
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enum protocol_version determine_protocol_version_server(void)
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{
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const char *git_protocol = getenv(GIT_PROTOCOL_ENVIRONMENT);
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enum protocol_version version = protocol_v0;
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/*
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* Determine which protocol version the client has requested. Since
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* multiple 'version' keys can be sent by the client, indicating that
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* the client is okay to speak any of them, select the greatest version
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* that the client has requested. This is due to the assumption that
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* the most recent protocol version will be the most state-of-the-art.
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*/
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if (git_protocol) {
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struct string_list list = STRING_LIST_INIT_DUP;
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const struct string_list_item *item;
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string_list_split(&list, git_protocol, ':', -1);
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for_each_string_list_item(item, &list) {
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const char *value;
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enum protocol_version v;
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if (skip_prefix(item->string, "version=", &value)) {
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v = parse_protocol_version(value);
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if (v > version)
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version = v;
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}
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}
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string_list_clear(&list, 0);
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}
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return version;
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}
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enum protocol_version determine_protocol_version_client(const char *server_response)
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{
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enum protocol_version version = protocol_v0;
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if (skip_prefix(server_response, "version ", &server_response)) {
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version = parse_protocol_version(server_response);
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if (version == protocol_unknown_version)
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die("server is speaking an unknown protocol");
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if (version == protocol_v0)
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die("protocol error: server explicitly said version 0");
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}
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return version;
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}
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