f4609b896f
This also bumps the stable nixpkgs to 20.09 as of 2020-11-21, because there is some breakage in the git build related to the netrc credentials helper which someone has taken care of in nixpkgs. The stable channel is not used for anything other than git, so this should be fine. Change-Id: I3575a19dab09e1e9556cf8231d717de9890484fb
132 lines
3.6 KiB
C
132 lines
3.6 KiB
C
#include "cache.h"
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#include "config.h"
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#include "dir.h"
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#include "tr2_sysenv.h"
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/*
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* Each entry represents a trace2 setting.
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* See Documentation/technical/api-trace2.txt
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*/
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struct tr2_sysenv_entry {
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const char *env_var_name;
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const char *git_config_name;
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char *value;
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unsigned int getenv_called : 1;
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};
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/*
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* This table must match "enum tr2_sysenv_variable" in tr2_sysenv.h.
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*
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* The strings in this table are constant and must match the published
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* config and environment variable names as described in the documentation.
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*
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* We do not define entries for the GIT_TRACE2_PARENT_* environment
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* variables because they are transient and used to pass information
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* from parent to child git processes, rather than settings.
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*/
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/* clang-format off */
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static struct tr2_sysenv_entry tr2_sysenv_settings[] = {
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[TR2_SYSENV_CFG_PARAM] = { "GIT_TRACE2_CONFIG_PARAMS",
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"trace2.configparams" },
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[TR2_SYSENV_ENV_VARS] = { "GIT_TRACE2_ENV_VARS",
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"trace2.envvars" },
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[TR2_SYSENV_DST_DEBUG] = { "GIT_TRACE2_DST_DEBUG",
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"trace2.destinationdebug" },
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[TR2_SYSENV_NORMAL] = { "GIT_TRACE2",
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"trace2.normaltarget" },
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[TR2_SYSENV_NORMAL_BRIEF] = { "GIT_TRACE2_BRIEF",
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"trace2.normalbrief" },
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[TR2_SYSENV_EVENT] = { "GIT_TRACE2_EVENT",
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"trace2.eventtarget" },
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[TR2_SYSENV_EVENT_BRIEF] = { "GIT_TRACE2_EVENT_BRIEF",
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"trace2.eventbrief" },
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[TR2_SYSENV_EVENT_NESTING] = { "GIT_TRACE2_EVENT_NESTING",
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"trace2.eventnesting" },
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[TR2_SYSENV_PERF] = { "GIT_TRACE2_PERF",
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"trace2.perftarget" },
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[TR2_SYSENV_PERF_BRIEF] = { "GIT_TRACE2_PERF_BRIEF",
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"trace2.perfbrief" },
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[TR2_SYSENV_MAX_FILES] = { "GIT_TRACE2_MAX_FILES",
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"trace2.maxfiles" },
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};
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/* clang-format on */
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static int tr2_sysenv_cb(const char *key, const char *value, void *d)
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{
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int k;
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if (!starts_with(key, "trace2."))
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return 0;
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for (k = 0; k < ARRAY_SIZE(tr2_sysenv_settings); k++) {
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if (!strcmp(key, tr2_sysenv_settings[k].git_config_name)) {
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free(tr2_sysenv_settings[k].value);
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tr2_sysenv_settings[k].value = xstrdup(value);
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return 0;
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}
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}
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return 0;
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}
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/*
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* Load Trace2 settings from the system config (usually "/etc/gitconfig"
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* unless we were built with a runtime-prefix). These are intended to
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* define the default values for Trace2 as requested by the administrator.
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*
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* Then override with the Trace2 settings from the global config.
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*/
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void tr2_sysenv_load(void)
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{
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if (ARRAY_SIZE(tr2_sysenv_settings) != TR2_SYSENV_MUST_BE_LAST)
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BUG("tr2_sysenv_settings size is wrong");
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read_very_early_config(tr2_sysenv_cb, NULL);
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}
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/*
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* Return the value for the requested Trace2 setting from these sources:
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* the system config, the global config, and the environment.
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*/
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const char *tr2_sysenv_get(enum tr2_sysenv_variable var)
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{
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if (var >= TR2_SYSENV_MUST_BE_LAST)
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BUG("tr2_sysenv_get invalid var '%d'", var);
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if (!tr2_sysenv_settings[var].getenv_called) {
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const char *v = getenv(tr2_sysenv_settings[var].env_var_name);
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if (v && *v) {
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free(tr2_sysenv_settings[var].value);
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tr2_sysenv_settings[var].value = xstrdup(v);
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}
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tr2_sysenv_settings[var].getenv_called = 1;
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}
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return tr2_sysenv_settings[var].value;
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}
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/*
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* Return a friendly name for this setting that is suitable for printing
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* in an error messages.
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*/
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const char *tr2_sysenv_display_name(enum tr2_sysenv_variable var)
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{
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if (var >= TR2_SYSENV_MUST_BE_LAST)
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BUG("tr2_sysenv_get invalid var '%d'", var);
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return tr2_sysenv_settings[var].env_var_name;
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}
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void tr2_sysenv_release(void)
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{
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int k;
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for (k = 0; k < ARRAY_SIZE(tr2_sysenv_settings); k++)
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free(tr2_sysenv_settings[k].value);
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}
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