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trace2: teach Git to log environment variables

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Via trace2, Git can already log interesting config parameters (see the
trace2_cmd_list_config() function). However, this can grant an
incomplete picture because many config parameters also allow overrides
via environment variables.

To allow for more complete logs, we add a new trace2_cmd_list_env_vars()
function and supporting implementation, modeled after the pre-existing
config param logging implementation.

Signed-off-by: Josh Steadmon <steadmon@google.com>
Acked-by: Jeff Hostetler <jeffhost@microsoft.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Josh Steadmon
2020-03-20 14:06:15 -07:00
committed by Junio C Hamano
parent 98cedd0233
commit 3d3adaad91
11 changed files with 143 additions and 1 deletions
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13
trace2.h
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@ -182,6 +182,19 @@ void trace2_cmd_list_config_fl(const char *file, int line);
#define trace2_cmd_list_config() trace2_cmd_list_config_fl(__FILE__, __LINE__)
/*
* Emit one or more 'def_param' events for "important" environment variables.
*
* Use the TR2_SYSENV_ENV_VARS setting to register a comma-separated list of
* environment variables considered important. For example:
* git config --system trace2.envVars 'GIT_HTTP_USER_AGENT,GIT_CONFIG'
* or:
* GIT_TRACE2_ENV_VARS="GIT_HTTP_USER_AGENT,GIT_CONFIG"
*/
void trace2_cmd_list_env_vars_fl(const char *file, int line);
#define trace2_cmd_list_env_vars() trace2_cmd_list_env_vars_fl(__FILE__, __LINE__)
/*
* Emit a "def_param" event for the given config key/value pair IF
* we consider the key to be "important".