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manager: add ManagerEnvironment configuration setting

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This is useful for various variables that modify process behaviour. This makes
it easy to set it for pid1 without touching the kernel command line. Even for
the *user manager* this also can be convenient for the unprivileged user, who
cannot modify user@.service definition.

Variables that could be set like this include $SD_EVENT_PROFILE_DELAYS,
$SYSTEMD_FALLBACK_HOSTNAME, $SYSTEMD_MEMPOOL, $SYSTMED_RDRAND, etc.
This commit is contained in:
Zbigniew Jędrzejewski-Szmek
2021-02-22 20:10:55 +01:00
parent fa256f43e7
commit d55ed7de34
2 changed files with 37 additions and 5 deletions
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src/core/main.c
+19
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@@ -134,6 +134,7 @@ static usec_t arg_kexec_watchdog;
static char *arg_early_core_pattern;
static char *arg_watchdog_device;
static char **arg_default_environment;
static char **arg_manager_environment;
static struct rlimit *arg_default_rlimit[_RLIMIT_MAX];
static uint64_t arg_capability_bounding_set;
static bool arg_no_new_privs;
@@ -670,6 +671,7 @@ static int parse_config_file(void) {
{ "Manager", "DefaultStartLimitIntervalSec", config_parse_sec, 0, &arg_default_start_limit_interval },
{ "Manager", "DefaultStartLimitBurst", config_parse_unsigned, 0, &arg_default_start_limit_burst },
{ "Manager", "DefaultEnvironment", config_parse_environ, 0, &arg_default_environment },
{ "Manager", "ManagerEnvironment", config_parse_environ, 0, &arg_manager_environment },
{ "Manager", "DefaultLimitCPU", config_parse_rlimit, RLIMIT_CPU, arg_default_rlimit },
{ "Manager", "DefaultLimitFSIZE", config_parse_rlimit, RLIMIT_FSIZE, arg_default_rlimit },
{ "Manager", "DefaultLimitDATA", config_parse_rlimit, RLIMIT_DATA, arg_default_rlimit },
@@ -2301,6 +2303,19 @@ static void fallback_rlimit_memlock(const struct rlimit *saved_rlimit_memlock) {
arg_default_rlimit[RLIMIT_MEMLOCK] = rl;
}
static void setenv_manager_environment(void) {
char **p;
int r;
STRV_FOREACH(p, arg_manager_environment) {
log_debug("Setting '%s' in our own environment.", *p);
r = putenv_dup(*p, true);
if (r < 0)
log_warning_errno(errno, "Failed to setenv \"%s\", ignoring: %m", *p);
}
}
static void reset_arguments(void) {
/* Frees/resets arg_* variables, with a few exceptions commented below. */
@@ -2334,6 +2349,7 @@ static void reset_arguments(void) {
arg_watchdog_device = NULL;
arg_default_environment = strv_free(arg_default_environment);
arg_manager_environment = strv_free(arg_manager_environment);
rlimit_free_all(arg_default_rlimit);
arg_capability_bounding_set = CAP_ALL;
@@ -2395,6 +2411,9 @@ static int parse_configuration(const struct rlimit *saved_rlimit_nofile,
if (arg_show_status == _SHOW_STATUS_INVALID)
arg_show_status = SHOW_STATUS_YES;
/* Push variables into the manager environment block */
setenv_manager_environment();
return 0;
}